mirror of https://gitee.com/openkylin/linux.git
4404 lines
120 KiB
C
4404 lines
120 KiB
C
/*
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* Write ahead logging implementation copyright Chris Mason 2000
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*
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* The background commits make this code very interrelated, and
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* overly complex. I need to rethink things a bit....The major players:
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*
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* journal_begin -- call with the number of blocks you expect to log.
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* If the current transaction is too
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* old, it will block until the current transaction is
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* finished, and then start a new one.
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* Usually, your transaction will get joined in with
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* previous ones for speed.
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*
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* journal_join -- same as journal_begin, but won't block on the current
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* transaction regardless of age. Don't ever call
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* this. Ever. There are only two places it should be
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* called from, and they are both inside this file.
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*
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* journal_mark_dirty -- adds blocks into this transaction. clears any flags
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* that might make them get sent to disk
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* and then marks them BH_JDirty. Puts the buffer head
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* into the current transaction hash.
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*
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* journal_end -- if the current transaction is batchable, it does nothing
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* otherwise, it could do an async/synchronous commit, or
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* a full flush of all log and real blocks in the
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* transaction.
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*
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* flush_old_commits -- if the current transaction is too old, it is ended and
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* commit blocks are sent to disk. Forces commit blocks
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* to disk for all backgrounded commits that have been
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* around too long.
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* -- Note, if you call this as an immediate flush from
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* from within kupdate, it will ignore the immediate flag
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*/
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#include <linux/time.h>
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#include <linux/semaphore.h>
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#include <linux/vmalloc.h>
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#include "reiserfs.h"
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/fcntl.h>
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#include <linux/stat.h>
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#include <linux/string.h>
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#include <linux/buffer_head.h>
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#include <linux/workqueue.h>
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#include <linux/writeback.h>
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#include <linux/blkdev.h>
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#include <linux/backing-dev.h>
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#include <linux/uaccess.h>
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#include <linux/slab.h>
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/* gets a struct reiserfs_journal_list * from a list head */
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#define JOURNAL_LIST_ENTRY(h) (list_entry((h), struct reiserfs_journal_list, \
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j_list))
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#define JOURNAL_WORK_ENTRY(h) (list_entry((h), struct reiserfs_journal_list, \
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j_working_list))
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/* must be correct to keep the desc and commit structs at 4k */
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#define JOURNAL_TRANS_HALF 1018
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#define BUFNR 64 /*read ahead */
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/* cnode stat bits. Move these into reiserfs_fs.h */
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/* this block was freed, and can't be written. */
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#define BLOCK_FREED 2
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/* this block was freed during this transaction, and can't be written */
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#define BLOCK_FREED_HOLDER 3
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/* used in flush_journal_list */
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#define BLOCK_NEEDS_FLUSH 4
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#define BLOCK_DIRTIED 5
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/* journal list state bits */
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#define LIST_TOUCHED 1
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#define LIST_DIRTY 2
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#define LIST_COMMIT_PENDING 4 /* someone will commit this list */
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/* flags for do_journal_end */
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#define FLUSH_ALL 1 /* flush commit and real blocks */
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#define COMMIT_NOW 2 /* end and commit this transaction */
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#define WAIT 4 /* wait for the log blocks to hit the disk */
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static int do_journal_end(struct reiserfs_transaction_handle *, int flags);
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static int flush_journal_list(struct super_block *s,
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struct reiserfs_journal_list *jl, int flushall);
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static int flush_commit_list(struct super_block *s,
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struct reiserfs_journal_list *jl, int flushall);
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static int can_dirty(struct reiserfs_journal_cnode *cn);
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static int journal_join(struct reiserfs_transaction_handle *th,
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struct super_block *sb);
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static void release_journal_dev(struct super_block *super,
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struct reiserfs_journal *journal);
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static int dirty_one_transaction(struct super_block *s,
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struct reiserfs_journal_list *jl);
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static void flush_async_commits(struct work_struct *work);
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static void queue_log_writer(struct super_block *s);
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/* values for join in do_journal_begin_r */
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enum {
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JBEGIN_REG = 0, /* regular journal begin */
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/* join the running transaction if at all possible */
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JBEGIN_JOIN = 1,
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/* called from cleanup code, ignores aborted flag */
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JBEGIN_ABORT = 2,
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};
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static int do_journal_begin_r(struct reiserfs_transaction_handle *th,
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struct super_block *sb,
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unsigned long nblocks, int join);
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static void init_journal_hash(struct super_block *sb)
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{
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struct reiserfs_journal *journal = SB_JOURNAL(sb);
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memset(journal->j_hash_table, 0,
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JOURNAL_HASH_SIZE * sizeof(struct reiserfs_journal_cnode *));
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}
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/*
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* clears BH_Dirty and sticks the buffer on the clean list. Called because
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* I can't allow refile_buffer to make schedule happen after I've freed a
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* block. Look at remove_from_transaction and journal_mark_freed for
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* more details.
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*/
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static int reiserfs_clean_and_file_buffer(struct buffer_head *bh)
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{
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if (bh) {
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clear_buffer_dirty(bh);
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clear_buffer_journal_test(bh);
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}
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return 0;
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}
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static struct reiserfs_bitmap_node *allocate_bitmap_node(struct super_block
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*sb)
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{
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struct reiserfs_bitmap_node *bn;
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static int id;
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bn = kmalloc(sizeof(struct reiserfs_bitmap_node), GFP_NOFS);
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if (!bn) {
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return NULL;
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}
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bn->data = kzalloc(sb->s_blocksize, GFP_NOFS);
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if (!bn->data) {
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kfree(bn);
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return NULL;
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}
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bn->id = id++;
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INIT_LIST_HEAD(&bn->list);
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return bn;
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}
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static struct reiserfs_bitmap_node *get_bitmap_node(struct super_block *sb)
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{
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struct reiserfs_journal *journal = SB_JOURNAL(sb);
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struct reiserfs_bitmap_node *bn = NULL;
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struct list_head *entry = journal->j_bitmap_nodes.next;
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journal->j_used_bitmap_nodes++;
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repeat:
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if (entry != &journal->j_bitmap_nodes) {
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bn = list_entry(entry, struct reiserfs_bitmap_node, list);
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list_del(entry);
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memset(bn->data, 0, sb->s_blocksize);
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journal->j_free_bitmap_nodes--;
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return bn;
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}
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bn = allocate_bitmap_node(sb);
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if (!bn) {
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yield();
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goto repeat;
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}
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return bn;
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}
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static inline void free_bitmap_node(struct super_block *sb,
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struct reiserfs_bitmap_node *bn)
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{
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struct reiserfs_journal *journal = SB_JOURNAL(sb);
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journal->j_used_bitmap_nodes--;
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if (journal->j_free_bitmap_nodes > REISERFS_MAX_BITMAP_NODES) {
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kfree(bn->data);
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kfree(bn);
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} else {
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list_add(&bn->list, &journal->j_bitmap_nodes);
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journal->j_free_bitmap_nodes++;
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}
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}
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static void allocate_bitmap_nodes(struct super_block *sb)
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{
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int i;
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struct reiserfs_journal *journal = SB_JOURNAL(sb);
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struct reiserfs_bitmap_node *bn = NULL;
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for (i = 0; i < REISERFS_MIN_BITMAP_NODES; i++) {
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bn = allocate_bitmap_node(sb);
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if (bn) {
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list_add(&bn->list, &journal->j_bitmap_nodes);
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journal->j_free_bitmap_nodes++;
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} else {
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/* this is ok, we'll try again when more are needed */
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break;
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}
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}
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}
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static int set_bit_in_list_bitmap(struct super_block *sb,
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b_blocknr_t block,
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struct reiserfs_list_bitmap *jb)
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{
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unsigned int bmap_nr = block / (sb->s_blocksize << 3);
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unsigned int bit_nr = block % (sb->s_blocksize << 3);
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if (!jb->bitmaps[bmap_nr]) {
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jb->bitmaps[bmap_nr] = get_bitmap_node(sb);
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}
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set_bit(bit_nr, (unsigned long *)jb->bitmaps[bmap_nr]->data);
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return 0;
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}
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static void cleanup_bitmap_list(struct super_block *sb,
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struct reiserfs_list_bitmap *jb)
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{
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int i;
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if (jb->bitmaps == NULL)
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return;
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for (i = 0; i < reiserfs_bmap_count(sb); i++) {
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if (jb->bitmaps[i]) {
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free_bitmap_node(sb, jb->bitmaps[i]);
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jb->bitmaps[i] = NULL;
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}
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}
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}
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/*
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* only call this on FS unmount.
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*/
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static int free_list_bitmaps(struct super_block *sb,
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struct reiserfs_list_bitmap *jb_array)
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{
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int i;
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struct reiserfs_list_bitmap *jb;
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for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
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jb = jb_array + i;
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jb->journal_list = NULL;
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cleanup_bitmap_list(sb, jb);
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vfree(jb->bitmaps);
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jb->bitmaps = NULL;
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}
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return 0;
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}
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static int free_bitmap_nodes(struct super_block *sb)
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{
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struct reiserfs_journal *journal = SB_JOURNAL(sb);
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struct list_head *next = journal->j_bitmap_nodes.next;
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struct reiserfs_bitmap_node *bn;
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while (next != &journal->j_bitmap_nodes) {
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bn = list_entry(next, struct reiserfs_bitmap_node, list);
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list_del(next);
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kfree(bn->data);
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kfree(bn);
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next = journal->j_bitmap_nodes.next;
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journal->j_free_bitmap_nodes--;
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}
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return 0;
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}
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/*
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* get memory for JOURNAL_NUM_BITMAPS worth of bitmaps.
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* jb_array is the array to be filled in.
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*/
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int reiserfs_allocate_list_bitmaps(struct super_block *sb,
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struct reiserfs_list_bitmap *jb_array,
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unsigned int bmap_nr)
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{
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int i;
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int failed = 0;
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struct reiserfs_list_bitmap *jb;
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int mem = bmap_nr * sizeof(struct reiserfs_bitmap_node *);
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for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
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jb = jb_array + i;
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jb->journal_list = NULL;
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jb->bitmaps = vzalloc(mem);
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if (!jb->bitmaps) {
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reiserfs_warning(sb, "clm-2000", "unable to "
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"allocate bitmaps for journal lists");
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failed = 1;
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break;
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}
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}
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if (failed) {
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free_list_bitmaps(sb, jb_array);
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return -1;
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}
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return 0;
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}
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/*
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* find an available list bitmap. If you can't find one, flush a commit list
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* and try again
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*/
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static struct reiserfs_list_bitmap *get_list_bitmap(struct super_block *sb,
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struct reiserfs_journal_list
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*jl)
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{
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int i, j;
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struct reiserfs_journal *journal = SB_JOURNAL(sb);
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struct reiserfs_list_bitmap *jb = NULL;
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for (j = 0; j < (JOURNAL_NUM_BITMAPS * 3); j++) {
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i = journal->j_list_bitmap_index;
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journal->j_list_bitmap_index = (i + 1) % JOURNAL_NUM_BITMAPS;
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jb = journal->j_list_bitmap + i;
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if (journal->j_list_bitmap[i].journal_list) {
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flush_commit_list(sb,
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journal->j_list_bitmap[i].
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journal_list, 1);
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if (!journal->j_list_bitmap[i].journal_list) {
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break;
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}
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} else {
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break;
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}
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}
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/* double check to make sure if flushed correctly */
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if (jb->journal_list)
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return NULL;
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jb->journal_list = jl;
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return jb;
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}
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/*
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* allocates a new chunk of X nodes, and links them all together as a list.
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* Uses the cnode->next and cnode->prev pointers
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* returns NULL on failure
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*/
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static struct reiserfs_journal_cnode *allocate_cnodes(int num_cnodes)
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{
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struct reiserfs_journal_cnode *head;
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int i;
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if (num_cnodes <= 0) {
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return NULL;
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}
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head = vzalloc(num_cnodes * sizeof(struct reiserfs_journal_cnode));
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if (!head) {
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return NULL;
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}
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head[0].prev = NULL;
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head[0].next = head + 1;
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for (i = 1; i < num_cnodes; i++) {
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head[i].prev = head + (i - 1);
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head[i].next = head + (i + 1); /* if last one, overwrite it after the if */
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}
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head[num_cnodes - 1].next = NULL;
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return head;
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}
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/* pulls a cnode off the free list, or returns NULL on failure */
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static struct reiserfs_journal_cnode *get_cnode(struct super_block *sb)
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{
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struct reiserfs_journal_cnode *cn;
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struct reiserfs_journal *journal = SB_JOURNAL(sb);
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reiserfs_check_lock_depth(sb, "get_cnode");
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if (journal->j_cnode_free <= 0) {
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return NULL;
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}
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journal->j_cnode_used++;
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journal->j_cnode_free--;
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cn = journal->j_cnode_free_list;
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if (!cn) {
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return cn;
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}
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if (cn->next) {
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cn->next->prev = NULL;
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}
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journal->j_cnode_free_list = cn->next;
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memset(cn, 0, sizeof(struct reiserfs_journal_cnode));
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return cn;
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}
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/*
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* returns a cnode to the free list
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*/
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static void free_cnode(struct super_block *sb,
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struct reiserfs_journal_cnode *cn)
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{
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struct reiserfs_journal *journal = SB_JOURNAL(sb);
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reiserfs_check_lock_depth(sb, "free_cnode");
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journal->j_cnode_used--;
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journal->j_cnode_free++;
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/* memset(cn, 0, sizeof(struct reiserfs_journal_cnode)) ; */
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cn->next = journal->j_cnode_free_list;
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if (journal->j_cnode_free_list) {
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journal->j_cnode_free_list->prev = cn;
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}
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cn->prev = NULL; /* not needed with the memset, but I might kill the memset, and forget to do this */
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journal->j_cnode_free_list = cn;
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}
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static void clear_prepared_bits(struct buffer_head *bh)
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{
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clear_buffer_journal_prepared(bh);
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clear_buffer_journal_restore_dirty(bh);
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}
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/*
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* return a cnode with same dev, block number and size in table,
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* or null if not found
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*/
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static inline struct reiserfs_journal_cnode *get_journal_hash_dev(struct
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super_block
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*sb,
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struct
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reiserfs_journal_cnode
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**table,
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long bl)
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{
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struct reiserfs_journal_cnode *cn;
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cn = journal_hash(table, sb, bl);
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while (cn) {
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if (cn->blocknr == bl && cn->sb == sb)
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return cn;
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cn = cn->hnext;
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}
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return (struct reiserfs_journal_cnode *)0;
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}
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/*
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* this actually means 'can this block be reallocated yet?'. If you set
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* search_all, a block can only be allocated if it is not in the current
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* transaction, was not freed by the current transaction, and has no chance
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* of ever being overwritten by a replay after crashing.
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*
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* If you don't set search_all, a block can only be allocated if it is not
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* in the current transaction. Since deleting a block removes it from the
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* current transaction, this case should never happen. If you don't set
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* search_all, make sure you never write the block without logging it.
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*
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* next_zero_bit is a suggestion about the next block to try for find_forward.
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* when bl is rejected because it is set in a journal list bitmap, we search
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* for the next zero bit in the bitmap that rejected bl. Then, we return
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* that through next_zero_bit for find_forward to try.
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*
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* Just because we return something in next_zero_bit does not mean we won't
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* reject it on the next call to reiserfs_in_journal
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*/
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int reiserfs_in_journal(struct super_block *sb,
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unsigned int bmap_nr, int bit_nr, int search_all,
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b_blocknr_t * next_zero_bit)
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{
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struct reiserfs_journal *journal = SB_JOURNAL(sb);
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struct reiserfs_journal_cnode *cn;
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struct reiserfs_list_bitmap *jb;
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int i;
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unsigned long bl;
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*next_zero_bit = 0; /* always start this at zero. */
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PROC_INFO_INC(sb, journal.in_journal);
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/*
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* If we aren't doing a search_all, this is a metablock, and it
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* will be logged before use. if we crash before the transaction
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* that freed it commits, this transaction won't have committed
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* either, and the block will never be written
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*/
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if (search_all) {
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for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
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PROC_INFO_INC(sb, journal.in_journal_bitmap);
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jb = journal->j_list_bitmap + i;
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if (jb->journal_list && jb->bitmaps[bmap_nr] &&
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test_bit(bit_nr,
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(unsigned long *)jb->bitmaps[bmap_nr]->
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data)) {
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*next_zero_bit =
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find_next_zero_bit((unsigned long *)
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(jb->bitmaps[bmap_nr]->
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data),
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sb->s_blocksize << 3,
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|
bit_nr + 1);
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return 1;
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|
}
|
|
}
|
|
}
|
|
|
|
bl = bmap_nr * (sb->s_blocksize << 3) + bit_nr;
|
|
/* is it in any old transactions? */
|
|
if (search_all
|
|
&& (cn =
|
|
get_journal_hash_dev(sb, journal->j_list_hash_table, bl))) {
|
|
return 1;
|
|
}
|
|
|
|
/* is it in the current transaction. This should never happen */
|
|
if ((cn = get_journal_hash_dev(sb, journal->j_hash_table, bl))) {
|
|
BUG();
|
|
return 1;
|
|
}
|
|
|
|
PROC_INFO_INC(sb, journal.in_journal_reusable);
|
|
/* safe for reuse */
|
|
return 0;
|
|
}
|
|
|
|
/* insert cn into table */
|
|
static inline void insert_journal_hash(struct reiserfs_journal_cnode **table,
|
|
struct reiserfs_journal_cnode *cn)
|
|
{
|
|
struct reiserfs_journal_cnode *cn_orig;
|
|
|
|
cn_orig = journal_hash(table, cn->sb, cn->blocknr);
|
|
cn->hnext = cn_orig;
|
|
cn->hprev = NULL;
|
|
if (cn_orig) {
|
|
cn_orig->hprev = cn;
|
|
}
|
|
journal_hash(table, cn->sb, cn->blocknr) = cn;
|
|
}
|
|
|
|
/* lock the current transaction */
|
|
static inline void lock_journal(struct super_block *sb)
|
|
{
|
|
PROC_INFO_INC(sb, journal.lock_journal);
|
|
|
|
reiserfs_mutex_lock_safe(&SB_JOURNAL(sb)->j_mutex, sb);
|
|
}
|
|
|
|
/* unlock the current transaction */
|
|
static inline void unlock_journal(struct super_block *sb)
|
|
{
|
|
mutex_unlock(&SB_JOURNAL(sb)->j_mutex);
|
|
}
|
|
|
|
static inline void get_journal_list(struct reiserfs_journal_list *jl)
|
|
{
|
|
jl->j_refcount++;
|
|
}
|
|
|
|
static inline void put_journal_list(struct super_block *s,
|
|
struct reiserfs_journal_list *jl)
|
|
{
|
|
if (jl->j_refcount < 1) {
|
|
reiserfs_panic(s, "journal-2", "trans id %u, refcount at %d",
|
|
jl->j_trans_id, jl->j_refcount);
|
|
}
|
|
if (--jl->j_refcount == 0)
|
|
kfree(jl);
|
|
}
|
|
|
|
/*
|
|
* this used to be much more involved, and I'm keeping it just in case
|
|
* things get ugly again. it gets called by flush_commit_list, and
|
|
* cleans up any data stored about blocks freed during a transaction.
|
|
*/
|
|
static void cleanup_freed_for_journal_list(struct super_block *sb,
|
|
struct reiserfs_journal_list *jl)
|
|
{
|
|
|
|
struct reiserfs_list_bitmap *jb = jl->j_list_bitmap;
|
|
if (jb) {
|
|
cleanup_bitmap_list(sb, jb);
|
|
}
|
|
jl->j_list_bitmap->journal_list = NULL;
|
|
jl->j_list_bitmap = NULL;
|
|
}
|
|
|
|
static int journal_list_still_alive(struct super_block *s,
|
|
unsigned int trans_id)
|
|
{
|
|
struct reiserfs_journal *journal = SB_JOURNAL(s);
|
|
struct list_head *entry = &journal->j_journal_list;
|
|
struct reiserfs_journal_list *jl;
|
|
|
|
if (!list_empty(entry)) {
|
|
jl = JOURNAL_LIST_ENTRY(entry->next);
|
|
if (jl->j_trans_id <= trans_id) {
|
|
return 1;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* If page->mapping was null, we failed to truncate this page for
|
|
* some reason. Most likely because it was truncated after being
|
|
* logged via data=journal.
|
|
*
|
|
* This does a check to see if the buffer belongs to one of these
|
|
* lost pages before doing the final put_bh. If page->mapping was
|
|
* null, it tries to free buffers on the page, which should make the
|
|
* final page_cache_release drop the page from the lru.
|
|
*/
|
|
static void release_buffer_page(struct buffer_head *bh)
|
|
{
|
|
struct page *page = bh->b_page;
|
|
if (!page->mapping && trylock_page(page)) {
|
|
page_cache_get(page);
|
|
put_bh(bh);
|
|
if (!page->mapping)
|
|
try_to_free_buffers(page);
|
|
unlock_page(page);
|
|
page_cache_release(page);
|
|
} else {
|
|
put_bh(bh);
|
|
}
|
|
}
|
|
|
|
static void reiserfs_end_buffer_io_sync(struct buffer_head *bh, int uptodate)
|
|
{
|
|
char b[BDEVNAME_SIZE];
|
|
|
|
if (buffer_journaled(bh)) {
|
|
reiserfs_warning(NULL, "clm-2084",
|
|
"pinned buffer %lu:%s sent to disk",
|
|
bh->b_blocknr, bdevname(bh->b_bdev, b));
|
|
}
|
|
if (uptodate)
|
|
set_buffer_uptodate(bh);
|
|
else
|
|
clear_buffer_uptodate(bh);
|
|
|
|
unlock_buffer(bh);
|
|
release_buffer_page(bh);
|
|
}
|
|
|
|
static void reiserfs_end_ordered_io(struct buffer_head *bh, int uptodate)
|
|
{
|
|
if (uptodate)
|
|
set_buffer_uptodate(bh);
|
|
else
|
|
clear_buffer_uptodate(bh);
|
|
unlock_buffer(bh);
|
|
put_bh(bh);
|
|
}
|
|
|
|
static void submit_logged_buffer(struct buffer_head *bh)
|
|
{
|
|
get_bh(bh);
|
|
bh->b_end_io = reiserfs_end_buffer_io_sync;
|
|
clear_buffer_journal_new(bh);
|
|
clear_buffer_dirty(bh);
|
|
if (!test_clear_buffer_journal_test(bh))
|
|
BUG();
|
|
if (!buffer_uptodate(bh))
|
|
BUG();
|
|
submit_bh(WRITE, bh);
|
|
}
|
|
|
|
static void submit_ordered_buffer(struct buffer_head *bh)
|
|
{
|
|
get_bh(bh);
|
|
bh->b_end_io = reiserfs_end_ordered_io;
|
|
clear_buffer_dirty(bh);
|
|
if (!buffer_uptodate(bh))
|
|
BUG();
|
|
submit_bh(WRITE, bh);
|
|
}
|
|
|
|
#define CHUNK_SIZE 32
|
|
struct buffer_chunk {
|
|
struct buffer_head *bh[CHUNK_SIZE];
|
|
int nr;
|
|
};
|
|
|
|
static void write_chunk(struct buffer_chunk *chunk)
|
|
{
|
|
int i;
|
|
for (i = 0; i < chunk->nr; i++) {
|
|
submit_logged_buffer(chunk->bh[i]);
|
|
}
|
|
chunk->nr = 0;
|
|
}
|
|
|
|
static void write_ordered_chunk(struct buffer_chunk *chunk)
|
|
{
|
|
int i;
|
|
for (i = 0; i < chunk->nr; i++) {
|
|
submit_ordered_buffer(chunk->bh[i]);
|
|
}
|
|
chunk->nr = 0;
|
|
}
|
|
|
|
static int add_to_chunk(struct buffer_chunk *chunk, struct buffer_head *bh,
|
|
spinlock_t * lock, void (fn) (struct buffer_chunk *))
|
|
{
|
|
int ret = 0;
|
|
BUG_ON(chunk->nr >= CHUNK_SIZE);
|
|
chunk->bh[chunk->nr++] = bh;
|
|
if (chunk->nr >= CHUNK_SIZE) {
|
|
ret = 1;
|
|
if (lock) {
|
|
spin_unlock(lock);
|
|
fn(chunk);
|
|
spin_lock(lock);
|
|
} else {
|
|
fn(chunk);
|
|
}
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static atomic_t nr_reiserfs_jh = ATOMIC_INIT(0);
|
|
static struct reiserfs_jh *alloc_jh(void)
|
|
{
|
|
struct reiserfs_jh *jh;
|
|
while (1) {
|
|
jh = kmalloc(sizeof(*jh), GFP_NOFS);
|
|
if (jh) {
|
|
atomic_inc(&nr_reiserfs_jh);
|
|
return jh;
|
|
}
|
|
yield();
|
|
}
|
|
}
|
|
|
|
/*
|
|
* we want to free the jh when the buffer has been written
|
|
* and waited on
|
|
*/
|
|
void reiserfs_free_jh(struct buffer_head *bh)
|
|
{
|
|
struct reiserfs_jh *jh;
|
|
|
|
jh = bh->b_private;
|
|
if (jh) {
|
|
bh->b_private = NULL;
|
|
jh->bh = NULL;
|
|
list_del_init(&jh->list);
|
|
kfree(jh);
|
|
if (atomic_read(&nr_reiserfs_jh) <= 0)
|
|
BUG();
|
|
atomic_dec(&nr_reiserfs_jh);
|
|
put_bh(bh);
|
|
}
|
|
}
|
|
|
|
static inline int __add_jh(struct reiserfs_journal *j, struct buffer_head *bh,
|
|
int tail)
|
|
{
|
|
struct reiserfs_jh *jh;
|
|
|
|
if (bh->b_private) {
|
|
spin_lock(&j->j_dirty_buffers_lock);
|
|
if (!bh->b_private) {
|
|
spin_unlock(&j->j_dirty_buffers_lock);
|
|
goto no_jh;
|
|
}
|
|
jh = bh->b_private;
|
|
list_del_init(&jh->list);
|
|
} else {
|
|
no_jh:
|
|
get_bh(bh);
|
|
jh = alloc_jh();
|
|
spin_lock(&j->j_dirty_buffers_lock);
|
|
/*
|
|
* buffer must be locked for __add_jh, should be able to have
|
|
* two adds at the same time
|
|
*/
|
|
BUG_ON(bh->b_private);
|
|
jh->bh = bh;
|
|
bh->b_private = jh;
|
|
}
|
|
jh->jl = j->j_current_jl;
|
|
if (tail)
|
|
list_add_tail(&jh->list, &jh->jl->j_tail_bh_list);
|
|
else {
|
|
list_add_tail(&jh->list, &jh->jl->j_bh_list);
|
|
}
|
|
spin_unlock(&j->j_dirty_buffers_lock);
|
|
return 0;
|
|
}
|
|
|
|
int reiserfs_add_tail_list(struct inode *inode, struct buffer_head *bh)
|
|
{
|
|
return __add_jh(SB_JOURNAL(inode->i_sb), bh, 1);
|
|
}
|
|
int reiserfs_add_ordered_list(struct inode *inode, struct buffer_head *bh)
|
|
{
|
|
return __add_jh(SB_JOURNAL(inode->i_sb), bh, 0);
|
|
}
|
|
|
|
#define JH_ENTRY(l) list_entry((l), struct reiserfs_jh, list)
|
|
static int write_ordered_buffers(spinlock_t * lock,
|
|
struct reiserfs_journal *j,
|
|
struct reiserfs_journal_list *jl,
|
|
struct list_head *list)
|
|
{
|
|
struct buffer_head *bh;
|
|
struct reiserfs_jh *jh;
|
|
int ret = j->j_errno;
|
|
struct buffer_chunk chunk;
|
|
struct list_head tmp;
|
|
INIT_LIST_HEAD(&tmp);
|
|
|
|
chunk.nr = 0;
|
|
spin_lock(lock);
|
|
while (!list_empty(list)) {
|
|
jh = JH_ENTRY(list->next);
|
|
bh = jh->bh;
|
|
get_bh(bh);
|
|
if (!trylock_buffer(bh)) {
|
|
if (!buffer_dirty(bh)) {
|
|
list_move(&jh->list, &tmp);
|
|
goto loop_next;
|
|
}
|
|
spin_unlock(lock);
|
|
if (chunk.nr)
|
|
write_ordered_chunk(&chunk);
|
|
wait_on_buffer(bh);
|
|
cond_resched();
|
|
spin_lock(lock);
|
|
goto loop_next;
|
|
}
|
|
/*
|
|
* in theory, dirty non-uptodate buffers should never get here,
|
|
* but the upper layer io error paths still have a few quirks.
|
|
* Handle them here as gracefully as we can
|
|
*/
|
|
if (!buffer_uptodate(bh) && buffer_dirty(bh)) {
|
|
clear_buffer_dirty(bh);
|
|
ret = -EIO;
|
|
}
|
|
if (buffer_dirty(bh)) {
|
|
list_move(&jh->list, &tmp);
|
|
add_to_chunk(&chunk, bh, lock, write_ordered_chunk);
|
|
} else {
|
|
reiserfs_free_jh(bh);
|
|
unlock_buffer(bh);
|
|
}
|
|
loop_next:
|
|
put_bh(bh);
|
|
cond_resched_lock(lock);
|
|
}
|
|
if (chunk.nr) {
|
|
spin_unlock(lock);
|
|
write_ordered_chunk(&chunk);
|
|
spin_lock(lock);
|
|
}
|
|
while (!list_empty(&tmp)) {
|
|
jh = JH_ENTRY(tmp.prev);
|
|
bh = jh->bh;
|
|
get_bh(bh);
|
|
reiserfs_free_jh(bh);
|
|
|
|
if (buffer_locked(bh)) {
|
|
spin_unlock(lock);
|
|
wait_on_buffer(bh);
|
|
spin_lock(lock);
|
|
}
|
|
if (!buffer_uptodate(bh)) {
|
|
ret = -EIO;
|
|
}
|
|
/*
|
|
* ugly interaction with invalidatepage here.
|
|
* reiserfs_invalidate_page will pin any buffer that has a
|
|
* valid journal head from an older transaction. If someone
|
|
* else sets our buffer dirty after we write it in the first
|
|
* loop, and then someone truncates the page away, nobody
|
|
* will ever write the buffer. We're safe if we write the
|
|
* page one last time after freeing the journal header.
|
|
*/
|
|
if (buffer_dirty(bh) && unlikely(bh->b_page->mapping == NULL)) {
|
|
spin_unlock(lock);
|
|
ll_rw_block(WRITE, 1, &bh);
|
|
spin_lock(lock);
|
|
}
|
|
put_bh(bh);
|
|
cond_resched_lock(lock);
|
|
}
|
|
spin_unlock(lock);
|
|
return ret;
|
|
}
|
|
|
|
static int flush_older_commits(struct super_block *s,
|
|
struct reiserfs_journal_list *jl)
|
|
{
|
|
struct reiserfs_journal *journal = SB_JOURNAL(s);
|
|
struct reiserfs_journal_list *other_jl;
|
|
struct reiserfs_journal_list *first_jl;
|
|
struct list_head *entry;
|
|
unsigned int trans_id = jl->j_trans_id;
|
|
unsigned int other_trans_id;
|
|
unsigned int first_trans_id;
|
|
|
|
find_first:
|
|
/*
|
|
* first we walk backwards to find the oldest uncommitted transation
|
|
*/
|
|
first_jl = jl;
|
|
entry = jl->j_list.prev;
|
|
while (1) {
|
|
other_jl = JOURNAL_LIST_ENTRY(entry);
|
|
if (entry == &journal->j_journal_list ||
|
|
atomic_read(&other_jl->j_older_commits_done))
|
|
break;
|
|
|
|
first_jl = other_jl;
|
|
entry = other_jl->j_list.prev;
|
|
}
|
|
|
|
/* if we didn't find any older uncommitted transactions, return now */
|
|
if (first_jl == jl) {
|
|
return 0;
|
|
}
|
|
|
|
first_trans_id = first_jl->j_trans_id;
|
|
|
|
entry = &first_jl->j_list;
|
|
while (1) {
|
|
other_jl = JOURNAL_LIST_ENTRY(entry);
|
|
other_trans_id = other_jl->j_trans_id;
|
|
|
|
if (other_trans_id < trans_id) {
|
|
if (atomic_read(&other_jl->j_commit_left) != 0) {
|
|
flush_commit_list(s, other_jl, 0);
|
|
|
|
/* list we were called with is gone, return */
|
|
if (!journal_list_still_alive(s, trans_id))
|
|
return 1;
|
|
|
|
/*
|
|
* the one we just flushed is gone, this means
|
|
* all older lists are also gone, so first_jl
|
|
* is no longer valid either. Go back to the
|
|
* beginning.
|
|
*/
|
|
if (!journal_list_still_alive
|
|
(s, other_trans_id)) {
|
|
goto find_first;
|
|
}
|
|
}
|
|
entry = entry->next;
|
|
if (entry == &journal->j_journal_list)
|
|
return 0;
|
|
} else {
|
|
return 0;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int reiserfs_async_progress_wait(struct super_block *s)
|
|
{
|
|
struct reiserfs_journal *j = SB_JOURNAL(s);
|
|
|
|
if (atomic_read(&j->j_async_throttle)) {
|
|
int depth;
|
|
|
|
depth = reiserfs_write_unlock_nested(s);
|
|
congestion_wait(BLK_RW_ASYNC, HZ / 10);
|
|
reiserfs_write_lock_nested(s, depth);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* if this journal list still has commit blocks unflushed, send them to disk.
|
|
*
|
|
* log areas must be flushed in order (transaction 2 can't commit before
|
|
* transaction 1) Before the commit block can by written, every other log
|
|
* block must be safely on disk
|
|
*/
|
|
static int flush_commit_list(struct super_block *s,
|
|
struct reiserfs_journal_list *jl, int flushall)
|
|
{
|
|
int i;
|
|
b_blocknr_t bn;
|
|
struct buffer_head *tbh = NULL;
|
|
unsigned int trans_id = jl->j_trans_id;
|
|
struct reiserfs_journal *journal = SB_JOURNAL(s);
|
|
int retval = 0;
|
|
int write_len;
|
|
int depth;
|
|
|
|
reiserfs_check_lock_depth(s, "flush_commit_list");
|
|
|
|
if (atomic_read(&jl->j_older_commits_done)) {
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* before we can put our commit blocks on disk, we have to make
|
|
* sure everyone older than us is on disk too
|
|
*/
|
|
BUG_ON(jl->j_len <= 0);
|
|
BUG_ON(trans_id == journal->j_trans_id);
|
|
|
|
get_journal_list(jl);
|
|
if (flushall) {
|
|
if (flush_older_commits(s, jl) == 1) {
|
|
/*
|
|
* list disappeared during flush_older_commits.
|
|
* return
|
|
*/
|
|
goto put_jl;
|
|
}
|
|
}
|
|
|
|
/* make sure nobody is trying to flush this one at the same time */
|
|
reiserfs_mutex_lock_safe(&jl->j_commit_mutex, s);
|
|
|
|
if (!journal_list_still_alive(s, trans_id)) {
|
|
mutex_unlock(&jl->j_commit_mutex);
|
|
goto put_jl;
|
|
}
|
|
BUG_ON(jl->j_trans_id == 0);
|
|
|
|
/* this commit is done, exit */
|
|
if (atomic_read(&jl->j_commit_left) <= 0) {
|
|
if (flushall) {
|
|
atomic_set(&jl->j_older_commits_done, 1);
|
|
}
|
|
mutex_unlock(&jl->j_commit_mutex);
|
|
goto put_jl;
|
|
}
|
|
|
|
if (!list_empty(&jl->j_bh_list)) {
|
|
int ret;
|
|
|
|
/*
|
|
* We might sleep in numerous places inside
|
|
* write_ordered_buffers. Relax the write lock.
|
|
*/
|
|
depth = reiserfs_write_unlock_nested(s);
|
|
ret = write_ordered_buffers(&journal->j_dirty_buffers_lock,
|
|
journal, jl, &jl->j_bh_list);
|
|
if (ret < 0 && retval == 0)
|
|
retval = ret;
|
|
reiserfs_write_lock_nested(s, depth);
|
|
}
|
|
BUG_ON(!list_empty(&jl->j_bh_list));
|
|
/*
|
|
* for the description block and all the log blocks, submit any buffers
|
|
* that haven't already reached the disk. Try to write at least 256
|
|
* log blocks. later on, we will only wait on blocks that correspond
|
|
* to this transaction, but while we're unplugging we might as well
|
|
* get a chunk of data on there.
|
|
*/
|
|
atomic_inc(&journal->j_async_throttle);
|
|
write_len = jl->j_len + 1;
|
|
if (write_len < 256)
|
|
write_len = 256;
|
|
for (i = 0 ; i < write_len ; i++) {
|
|
bn = SB_ONDISK_JOURNAL_1st_BLOCK(s) + (jl->j_start + i) %
|
|
SB_ONDISK_JOURNAL_SIZE(s);
|
|
tbh = journal_find_get_block(s, bn);
|
|
if (tbh) {
|
|
if (buffer_dirty(tbh)) {
|
|
depth = reiserfs_write_unlock_nested(s);
|
|
ll_rw_block(WRITE, 1, &tbh);
|
|
reiserfs_write_lock_nested(s, depth);
|
|
}
|
|
put_bh(tbh) ;
|
|
}
|
|
}
|
|
atomic_dec(&journal->j_async_throttle);
|
|
|
|
for (i = 0; i < (jl->j_len + 1); i++) {
|
|
bn = SB_ONDISK_JOURNAL_1st_BLOCK(s) +
|
|
(jl->j_start + i) % SB_ONDISK_JOURNAL_SIZE(s);
|
|
tbh = journal_find_get_block(s, bn);
|
|
|
|
depth = reiserfs_write_unlock_nested(s);
|
|
__wait_on_buffer(tbh);
|
|
reiserfs_write_lock_nested(s, depth);
|
|
/*
|
|
* since we're using ll_rw_blk above, it might have skipped
|
|
* over a locked buffer. Double check here
|
|
*/
|
|
/* redundant, sync_dirty_buffer() checks */
|
|
if (buffer_dirty(tbh)) {
|
|
depth = reiserfs_write_unlock_nested(s);
|
|
sync_dirty_buffer(tbh);
|
|
reiserfs_write_lock_nested(s, depth);
|
|
}
|
|
if (unlikely(!buffer_uptodate(tbh))) {
|
|
#ifdef CONFIG_REISERFS_CHECK
|
|
reiserfs_warning(s, "journal-601",
|
|
"buffer write failed");
|
|
#endif
|
|
retval = -EIO;
|
|
}
|
|
/* once for journal_find_get_block */
|
|
put_bh(tbh);
|
|
/* once due to original getblk in do_journal_end */
|
|
put_bh(tbh);
|
|
atomic_dec(&jl->j_commit_left);
|
|
}
|
|
|
|
BUG_ON(atomic_read(&jl->j_commit_left) != 1);
|
|
|
|
/*
|
|
* If there was a write error in the journal - we can't commit
|
|
* this transaction - it will be invalid and, if successful,
|
|
* will just end up propagating the write error out to
|
|
* the file system.
|
|
*/
|
|
if (likely(!retval && !reiserfs_is_journal_aborted (journal))) {
|
|
if (buffer_dirty(jl->j_commit_bh))
|
|
BUG();
|
|
mark_buffer_dirty(jl->j_commit_bh) ;
|
|
depth = reiserfs_write_unlock_nested(s);
|
|
if (reiserfs_barrier_flush(s))
|
|
__sync_dirty_buffer(jl->j_commit_bh, WRITE_FLUSH_FUA);
|
|
else
|
|
sync_dirty_buffer(jl->j_commit_bh);
|
|
reiserfs_write_lock_nested(s, depth);
|
|
}
|
|
|
|
/*
|
|
* If there was a write error in the journal - we can't commit this
|
|
* transaction - it will be invalid and, if successful, will just end
|
|
* up propagating the write error out to the filesystem.
|
|
*/
|
|
if (unlikely(!buffer_uptodate(jl->j_commit_bh))) {
|
|
#ifdef CONFIG_REISERFS_CHECK
|
|
reiserfs_warning(s, "journal-615", "buffer write failed");
|
|
#endif
|
|
retval = -EIO;
|
|
}
|
|
bforget(jl->j_commit_bh);
|
|
if (journal->j_last_commit_id != 0 &&
|
|
(jl->j_trans_id - journal->j_last_commit_id) != 1) {
|
|
reiserfs_warning(s, "clm-2200", "last commit %lu, current %lu",
|
|
journal->j_last_commit_id, jl->j_trans_id);
|
|
}
|
|
journal->j_last_commit_id = jl->j_trans_id;
|
|
|
|
/*
|
|
* now, every commit block is on the disk. It is safe to allow
|
|
* blocks freed during this transaction to be reallocated
|
|
*/
|
|
cleanup_freed_for_journal_list(s, jl);
|
|
|
|
retval = retval ? retval : journal->j_errno;
|
|
|
|
/* mark the metadata dirty */
|
|
if (!retval)
|
|
dirty_one_transaction(s, jl);
|
|
atomic_dec(&jl->j_commit_left);
|
|
|
|
if (flushall) {
|
|
atomic_set(&jl->j_older_commits_done, 1);
|
|
}
|
|
mutex_unlock(&jl->j_commit_mutex);
|
|
put_jl:
|
|
put_journal_list(s, jl);
|
|
|
|
if (retval)
|
|
reiserfs_abort(s, retval, "Journal write error in %s",
|
|
__func__);
|
|
return retval;
|
|
}
|
|
|
|
/*
|
|
* flush_journal_list frequently needs to find a newer transaction for a
|
|
* given block. This does that, or returns NULL if it can't find anything
|
|
*/
|
|
static struct reiserfs_journal_list *find_newer_jl_for_cn(struct
|
|
reiserfs_journal_cnode
|
|
*cn)
|
|
{
|
|
struct super_block *sb = cn->sb;
|
|
b_blocknr_t blocknr = cn->blocknr;
|
|
|
|
cn = cn->hprev;
|
|
while (cn) {
|
|
if (cn->sb == sb && cn->blocknr == blocknr && cn->jlist) {
|
|
return cn->jlist;
|
|
}
|
|
cn = cn->hprev;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static void remove_journal_hash(struct super_block *,
|
|
struct reiserfs_journal_cnode **,
|
|
struct reiserfs_journal_list *, unsigned long,
|
|
int);
|
|
|
|
/*
|
|
* once all the real blocks have been flushed, it is safe to remove them
|
|
* from the journal list for this transaction. Aside from freeing the
|
|
* cnode, this also allows the block to be reallocated for data blocks
|
|
* if it had been deleted.
|
|
*/
|
|
static void remove_all_from_journal_list(struct super_block *sb,
|
|
struct reiserfs_journal_list *jl,
|
|
int debug)
|
|
{
|
|
struct reiserfs_journal *journal = SB_JOURNAL(sb);
|
|
struct reiserfs_journal_cnode *cn, *last;
|
|
cn = jl->j_realblock;
|
|
|
|
/*
|
|
* which is better, to lock once around the whole loop, or
|
|
* to lock for each call to remove_journal_hash?
|
|
*/
|
|
while (cn) {
|
|
if (cn->blocknr != 0) {
|
|
if (debug) {
|
|
reiserfs_warning(sb, "reiserfs-2201",
|
|
"block %u, bh is %d, state %ld",
|
|
cn->blocknr, cn->bh ? 1 : 0,
|
|
cn->state);
|
|
}
|
|
cn->state = 0;
|
|
remove_journal_hash(sb, journal->j_list_hash_table,
|
|
jl, cn->blocknr, 1);
|
|
}
|
|
last = cn;
|
|
cn = cn->next;
|
|
free_cnode(sb, last);
|
|
}
|
|
jl->j_realblock = NULL;
|
|
}
|
|
|
|
/*
|
|
* if this timestamp is greater than the timestamp we wrote last to the
|
|
* header block, write it to the header block. once this is done, I can
|
|
* safely say the log area for this transaction won't ever be replayed,
|
|
* and I can start releasing blocks in this transaction for reuse as data
|
|
* blocks. called by flush_journal_list, before it calls
|
|
* remove_all_from_journal_list
|
|
*/
|
|
static int _update_journal_header_block(struct super_block *sb,
|
|
unsigned long offset,
|
|
unsigned int trans_id)
|
|
{
|
|
struct reiserfs_journal_header *jh;
|
|
struct reiserfs_journal *journal = SB_JOURNAL(sb);
|
|
int depth;
|
|
|
|
if (reiserfs_is_journal_aborted(journal))
|
|
return -EIO;
|
|
|
|
if (trans_id >= journal->j_last_flush_trans_id) {
|
|
if (buffer_locked((journal->j_header_bh))) {
|
|
depth = reiserfs_write_unlock_nested(sb);
|
|
__wait_on_buffer(journal->j_header_bh);
|
|
reiserfs_write_lock_nested(sb, depth);
|
|
if (unlikely(!buffer_uptodate(journal->j_header_bh))) {
|
|
#ifdef CONFIG_REISERFS_CHECK
|
|
reiserfs_warning(sb, "journal-699",
|
|
"buffer write failed");
|
|
#endif
|
|
return -EIO;
|
|
}
|
|
}
|
|
journal->j_last_flush_trans_id = trans_id;
|
|
journal->j_first_unflushed_offset = offset;
|
|
jh = (struct reiserfs_journal_header *)(journal->j_header_bh->
|
|
b_data);
|
|
jh->j_last_flush_trans_id = cpu_to_le32(trans_id);
|
|
jh->j_first_unflushed_offset = cpu_to_le32(offset);
|
|
jh->j_mount_id = cpu_to_le32(journal->j_mount_id);
|
|
|
|
set_buffer_dirty(journal->j_header_bh);
|
|
depth = reiserfs_write_unlock_nested(sb);
|
|
|
|
if (reiserfs_barrier_flush(sb))
|
|
__sync_dirty_buffer(journal->j_header_bh, WRITE_FLUSH_FUA);
|
|
else
|
|
sync_dirty_buffer(journal->j_header_bh);
|
|
|
|
reiserfs_write_lock_nested(sb, depth);
|
|
if (!buffer_uptodate(journal->j_header_bh)) {
|
|
reiserfs_warning(sb, "journal-837",
|
|
"IO error during journal replay");
|
|
return -EIO;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int update_journal_header_block(struct super_block *sb,
|
|
unsigned long offset,
|
|
unsigned int trans_id)
|
|
{
|
|
return _update_journal_header_block(sb, offset, trans_id);
|
|
}
|
|
|
|
/*
|
|
** flush any and all journal lists older than you are
|
|
** can only be called from flush_journal_list
|
|
*/
|
|
static int flush_older_journal_lists(struct super_block *sb,
|
|
struct reiserfs_journal_list *jl)
|
|
{
|
|
struct list_head *entry;
|
|
struct reiserfs_journal_list *other_jl;
|
|
struct reiserfs_journal *journal = SB_JOURNAL(sb);
|
|
unsigned int trans_id = jl->j_trans_id;
|
|
|
|
/*
|
|
* we know we are the only ones flushing things, no extra race
|
|
* protection is required.
|
|
*/
|
|
restart:
|
|
entry = journal->j_journal_list.next;
|
|
/* Did we wrap? */
|
|
if (entry == &journal->j_journal_list)
|
|
return 0;
|
|
other_jl = JOURNAL_LIST_ENTRY(entry);
|
|
if (other_jl->j_trans_id < trans_id) {
|
|
BUG_ON(other_jl->j_refcount <= 0);
|
|
/* do not flush all */
|
|
flush_journal_list(sb, other_jl, 0);
|
|
|
|
/* other_jl is now deleted from the list */
|
|
goto restart;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void del_from_work_list(struct super_block *s,
|
|
struct reiserfs_journal_list *jl)
|
|
{
|
|
struct reiserfs_journal *journal = SB_JOURNAL(s);
|
|
if (!list_empty(&jl->j_working_list)) {
|
|
list_del_init(&jl->j_working_list);
|
|
journal->j_num_work_lists--;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* flush a journal list, both commit and real blocks
|
|
*
|
|
* always set flushall to 1, unless you are calling from inside
|
|
* flush_journal_list
|
|
*
|
|
* IMPORTANT. This can only be called while there are no journal writers,
|
|
* and the journal is locked. That means it can only be called from
|
|
* do_journal_end, or by journal_release
|
|
*/
|
|
static int flush_journal_list(struct super_block *s,
|
|
struct reiserfs_journal_list *jl, int flushall)
|
|
{
|
|
struct reiserfs_journal_list *pjl;
|
|
struct reiserfs_journal_cnode *cn, *last;
|
|
int count;
|
|
int was_jwait = 0;
|
|
int was_dirty = 0;
|
|
struct buffer_head *saved_bh;
|
|
unsigned long j_len_saved = jl->j_len;
|
|
struct reiserfs_journal *journal = SB_JOURNAL(s);
|
|
int err = 0;
|
|
int depth;
|
|
|
|
BUG_ON(j_len_saved <= 0);
|
|
|
|
if (atomic_read(&journal->j_wcount) != 0) {
|
|
reiserfs_warning(s, "clm-2048", "called with wcount %d",
|
|
atomic_read(&journal->j_wcount));
|
|
}
|
|
|
|
/* if flushall == 0, the lock is already held */
|
|
if (flushall) {
|
|
reiserfs_mutex_lock_safe(&journal->j_flush_mutex, s);
|
|
} else if (mutex_trylock(&journal->j_flush_mutex)) {
|
|
BUG();
|
|
}
|
|
|
|
count = 0;
|
|
if (j_len_saved > journal->j_trans_max) {
|
|
reiserfs_panic(s, "journal-715", "length is %lu, trans id %lu",
|
|
j_len_saved, jl->j_trans_id);
|
|
return 0;
|
|
}
|
|
|
|
/* if all the work is already done, get out of here */
|
|
if (atomic_read(&jl->j_nonzerolen) <= 0 &&
|
|
atomic_read(&jl->j_commit_left) <= 0) {
|
|
goto flush_older_and_return;
|
|
}
|
|
|
|
/*
|
|
* start by putting the commit list on disk. This will also flush
|
|
* the commit lists of any olders transactions
|
|
*/
|
|
flush_commit_list(s, jl, 1);
|
|
|
|
if (!(jl->j_state & LIST_DIRTY)
|
|
&& !reiserfs_is_journal_aborted(journal))
|
|
BUG();
|
|
|
|
/* are we done now? */
|
|
if (atomic_read(&jl->j_nonzerolen) <= 0 &&
|
|
atomic_read(&jl->j_commit_left) <= 0) {
|
|
goto flush_older_and_return;
|
|
}
|
|
|
|
/*
|
|
* loop through each cnode, see if we need to write it,
|
|
* or wait on a more recent transaction, or just ignore it
|
|
*/
|
|
if (atomic_read(&journal->j_wcount) != 0) {
|
|
reiserfs_panic(s, "journal-844", "journal list is flushing, "
|
|
"wcount is not 0");
|
|
}
|
|
cn = jl->j_realblock;
|
|
while (cn) {
|
|
was_jwait = 0;
|
|
was_dirty = 0;
|
|
saved_bh = NULL;
|
|
/* blocknr of 0 is no longer in the hash, ignore it */
|
|
if (cn->blocknr == 0) {
|
|
goto free_cnode;
|
|
}
|
|
|
|
/*
|
|
* This transaction failed commit.
|
|
* Don't write out to the disk
|
|
*/
|
|
if (!(jl->j_state & LIST_DIRTY))
|
|
goto free_cnode;
|
|
|
|
pjl = find_newer_jl_for_cn(cn);
|
|
/*
|
|
* the order is important here. We check pjl to make sure we
|
|
* don't clear BH_JDirty_wait if we aren't the one writing this
|
|
* block to disk
|
|
*/
|
|
if (!pjl && cn->bh) {
|
|
saved_bh = cn->bh;
|
|
|
|
/*
|
|
* we do this to make sure nobody releases the
|
|
* buffer while we are working with it
|
|
*/
|
|
get_bh(saved_bh);
|
|
|
|
if (buffer_journal_dirty(saved_bh)) {
|
|
BUG_ON(!can_dirty(cn));
|
|
was_jwait = 1;
|
|
was_dirty = 1;
|
|
} else if (can_dirty(cn)) {
|
|
/*
|
|
* everything with !pjl && jwait
|
|
* should be writable
|
|
*/
|
|
BUG();
|
|
}
|
|
}
|
|
|
|
/*
|
|
* if someone has this block in a newer transaction, just make
|
|
* sure they are committed, and don't try writing it to disk
|
|
*/
|
|
if (pjl) {
|
|
if (atomic_read(&pjl->j_commit_left))
|
|
flush_commit_list(s, pjl, 1);
|
|
goto free_cnode;
|
|
}
|
|
|
|
/*
|
|
* bh == NULL when the block got to disk on its own, OR,
|
|
* the block got freed in a future transaction
|
|
*/
|
|
if (saved_bh == NULL) {
|
|
goto free_cnode;
|
|
}
|
|
|
|
/*
|
|
* this should never happen. kupdate_one_transaction has
|
|
* this list locked while it works, so we should never see a
|
|
* buffer here that is not marked JDirty_wait
|
|
*/
|
|
if ((!was_jwait) && !buffer_locked(saved_bh)) {
|
|
reiserfs_warning(s, "journal-813",
|
|
"BAD! buffer %llu %cdirty %cjwait, "
|
|
"not in a newer tranasction",
|
|
(unsigned long long)saved_bh->
|
|
b_blocknr, was_dirty ? ' ' : '!',
|
|
was_jwait ? ' ' : '!');
|
|
}
|
|
if (was_dirty) {
|
|
/*
|
|
* we inc again because saved_bh gets decremented
|
|
* at free_cnode
|
|
*/
|
|
get_bh(saved_bh);
|
|
set_bit(BLOCK_NEEDS_FLUSH, &cn->state);
|
|
lock_buffer(saved_bh);
|
|
BUG_ON(cn->blocknr != saved_bh->b_blocknr);
|
|
if (buffer_dirty(saved_bh))
|
|
submit_logged_buffer(saved_bh);
|
|
else
|
|
unlock_buffer(saved_bh);
|
|
count++;
|
|
} else {
|
|
reiserfs_warning(s, "clm-2082",
|
|
"Unable to flush buffer %llu in %s",
|
|
(unsigned long long)saved_bh->
|
|
b_blocknr, __func__);
|
|
}
|
|
free_cnode:
|
|
last = cn;
|
|
cn = cn->next;
|
|
if (saved_bh) {
|
|
/*
|
|
* we incremented this to keep others from
|
|
* taking the buffer head away
|
|
*/
|
|
put_bh(saved_bh);
|
|
if (atomic_read(&saved_bh->b_count) < 0) {
|
|
reiserfs_warning(s, "journal-945",
|
|
"saved_bh->b_count < 0");
|
|
}
|
|
}
|
|
}
|
|
if (count > 0) {
|
|
cn = jl->j_realblock;
|
|
while (cn) {
|
|
if (test_bit(BLOCK_NEEDS_FLUSH, &cn->state)) {
|
|
if (!cn->bh) {
|
|
reiserfs_panic(s, "journal-1011",
|
|
"cn->bh is NULL");
|
|
}
|
|
|
|
depth = reiserfs_write_unlock_nested(s);
|
|
__wait_on_buffer(cn->bh);
|
|
reiserfs_write_lock_nested(s, depth);
|
|
|
|
if (!cn->bh) {
|
|
reiserfs_panic(s, "journal-1012",
|
|
"cn->bh is NULL");
|
|
}
|
|
if (unlikely(!buffer_uptodate(cn->bh))) {
|
|
#ifdef CONFIG_REISERFS_CHECK
|
|
reiserfs_warning(s, "journal-949",
|
|
"buffer write failed");
|
|
#endif
|
|
err = -EIO;
|
|
}
|
|
/*
|
|
* note, we must clear the JDirty_wait bit
|
|
* after the up to date check, otherwise we
|
|
* race against our flushpage routine
|
|
*/
|
|
BUG_ON(!test_clear_buffer_journal_dirty
|
|
(cn->bh));
|
|
|
|
/* drop one ref for us */
|
|
put_bh(cn->bh);
|
|
/* drop one ref for journal_mark_dirty */
|
|
release_buffer_page(cn->bh);
|
|
}
|
|
cn = cn->next;
|
|
}
|
|
}
|
|
|
|
if (err)
|
|
reiserfs_abort(s, -EIO,
|
|
"Write error while pushing transaction to disk in %s",
|
|
__func__);
|
|
flush_older_and_return:
|
|
|
|
/*
|
|
* before we can update the journal header block, we _must_ flush all
|
|
* real blocks from all older transactions to disk. This is because
|
|
* once the header block is updated, this transaction will not be
|
|
* replayed after a crash
|
|
*/
|
|
if (flushall) {
|
|
flush_older_journal_lists(s, jl);
|
|
}
|
|
|
|
err = journal->j_errno;
|
|
/*
|
|
* before we can remove everything from the hash tables for this
|
|
* transaction, we must make sure it can never be replayed
|
|
*
|
|
* since we are only called from do_journal_end, we know for sure there
|
|
* are no allocations going on while we are flushing journal lists. So,
|
|
* we only need to update the journal header block for the last list
|
|
* being flushed
|
|
*/
|
|
if (!err && flushall) {
|
|
err =
|
|
update_journal_header_block(s,
|
|
(jl->j_start + jl->j_len +
|
|
2) % SB_ONDISK_JOURNAL_SIZE(s),
|
|
jl->j_trans_id);
|
|
if (err)
|
|
reiserfs_abort(s, -EIO,
|
|
"Write error while updating journal header in %s",
|
|
__func__);
|
|
}
|
|
remove_all_from_journal_list(s, jl, 0);
|
|
list_del_init(&jl->j_list);
|
|
journal->j_num_lists--;
|
|
del_from_work_list(s, jl);
|
|
|
|
if (journal->j_last_flush_id != 0 &&
|
|
(jl->j_trans_id - journal->j_last_flush_id) != 1) {
|
|
reiserfs_warning(s, "clm-2201", "last flush %lu, current %lu",
|
|
journal->j_last_flush_id, jl->j_trans_id);
|
|
}
|
|
journal->j_last_flush_id = jl->j_trans_id;
|
|
|
|
/*
|
|
* not strictly required since we are freeing the list, but it should
|
|
* help find code using dead lists later on
|
|
*/
|
|
jl->j_len = 0;
|
|
atomic_set(&jl->j_nonzerolen, 0);
|
|
jl->j_start = 0;
|
|
jl->j_realblock = NULL;
|
|
jl->j_commit_bh = NULL;
|
|
jl->j_trans_id = 0;
|
|
jl->j_state = 0;
|
|
put_journal_list(s, jl);
|
|
if (flushall)
|
|
mutex_unlock(&journal->j_flush_mutex);
|
|
return err;
|
|
}
|
|
|
|
static int write_one_transaction(struct super_block *s,
|
|
struct reiserfs_journal_list *jl,
|
|
struct buffer_chunk *chunk)
|
|
{
|
|
struct reiserfs_journal_cnode *cn;
|
|
int ret = 0;
|
|
|
|
jl->j_state |= LIST_TOUCHED;
|
|
del_from_work_list(s, jl);
|
|
if (jl->j_len == 0 || atomic_read(&jl->j_nonzerolen) == 0) {
|
|
return 0;
|
|
}
|
|
|
|
cn = jl->j_realblock;
|
|
while (cn) {
|
|
/*
|
|
* if the blocknr == 0, this has been cleared from the hash,
|
|
* skip it
|
|
*/
|
|
if (cn->blocknr == 0) {
|
|
goto next;
|
|
}
|
|
if (cn->bh && can_dirty(cn) && buffer_dirty(cn->bh)) {
|
|
struct buffer_head *tmp_bh;
|
|
/*
|
|
* we can race against journal_mark_freed when we try
|
|
* to lock_buffer(cn->bh), so we have to inc the buffer
|
|
* count, and recheck things after locking
|
|
*/
|
|
tmp_bh = cn->bh;
|
|
get_bh(tmp_bh);
|
|
lock_buffer(tmp_bh);
|
|
if (cn->bh && can_dirty(cn) && buffer_dirty(tmp_bh)) {
|
|
if (!buffer_journal_dirty(tmp_bh) ||
|
|
buffer_journal_prepared(tmp_bh))
|
|
BUG();
|
|
add_to_chunk(chunk, tmp_bh, NULL, write_chunk);
|
|
ret++;
|
|
} else {
|
|
/* note, cn->bh might be null now */
|
|
unlock_buffer(tmp_bh);
|
|
}
|
|
put_bh(tmp_bh);
|
|
}
|
|
next:
|
|
cn = cn->next;
|
|
cond_resched();
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/* used by flush_commit_list */
|
|
static int dirty_one_transaction(struct super_block *s,
|
|
struct reiserfs_journal_list *jl)
|
|
{
|
|
struct reiserfs_journal_cnode *cn;
|
|
struct reiserfs_journal_list *pjl;
|
|
int ret = 0;
|
|
|
|
jl->j_state |= LIST_DIRTY;
|
|
cn = jl->j_realblock;
|
|
while (cn) {
|
|
/*
|
|
* look for a more recent transaction that logged this
|
|
* buffer. Only the most recent transaction with a buffer in
|
|
* it is allowed to send that buffer to disk
|
|
*/
|
|
pjl = find_newer_jl_for_cn(cn);
|
|
if (!pjl && cn->blocknr && cn->bh
|
|
&& buffer_journal_dirty(cn->bh)) {
|
|
BUG_ON(!can_dirty(cn));
|
|
/*
|
|
* if the buffer is prepared, it will either be logged
|
|
* or restored. If restored, we need to make sure
|
|
* it actually gets marked dirty
|
|
*/
|
|
clear_buffer_journal_new(cn->bh);
|
|
if (buffer_journal_prepared(cn->bh)) {
|
|
set_buffer_journal_restore_dirty(cn->bh);
|
|
} else {
|
|
set_buffer_journal_test(cn->bh);
|
|
mark_buffer_dirty(cn->bh);
|
|
}
|
|
}
|
|
cn = cn->next;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int kupdate_transactions(struct super_block *s,
|
|
struct reiserfs_journal_list *jl,
|
|
struct reiserfs_journal_list **next_jl,
|
|
unsigned int *next_trans_id,
|
|
int num_blocks, int num_trans)
|
|
{
|
|
int ret = 0;
|
|
int written = 0;
|
|
int transactions_flushed = 0;
|
|
unsigned int orig_trans_id = jl->j_trans_id;
|
|
struct buffer_chunk chunk;
|
|
struct list_head *entry;
|
|
struct reiserfs_journal *journal = SB_JOURNAL(s);
|
|
chunk.nr = 0;
|
|
|
|
reiserfs_mutex_lock_safe(&journal->j_flush_mutex, s);
|
|
if (!journal_list_still_alive(s, orig_trans_id)) {
|
|
goto done;
|
|
}
|
|
|
|
/*
|
|
* we've got j_flush_mutex held, nobody is going to delete any
|
|
* of these lists out from underneath us
|
|
*/
|
|
while ((num_trans && transactions_flushed < num_trans) ||
|
|
(!num_trans && written < num_blocks)) {
|
|
|
|
if (jl->j_len == 0 || (jl->j_state & LIST_TOUCHED) ||
|
|
atomic_read(&jl->j_commit_left)
|
|
|| !(jl->j_state & LIST_DIRTY)) {
|
|
del_from_work_list(s, jl);
|
|
break;
|
|
}
|
|
ret = write_one_transaction(s, jl, &chunk);
|
|
|
|
if (ret < 0)
|
|
goto done;
|
|
transactions_flushed++;
|
|
written += ret;
|
|
entry = jl->j_list.next;
|
|
|
|
/* did we wrap? */
|
|
if (entry == &journal->j_journal_list) {
|
|
break;
|
|
}
|
|
jl = JOURNAL_LIST_ENTRY(entry);
|
|
|
|
/* don't bother with older transactions */
|
|
if (jl->j_trans_id <= orig_trans_id)
|
|
break;
|
|
}
|
|
if (chunk.nr) {
|
|
write_chunk(&chunk);
|
|
}
|
|
|
|
done:
|
|
mutex_unlock(&journal->j_flush_mutex);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* for o_sync and fsync heavy applications, they tend to use
|
|
* all the journa list slots with tiny transactions. These
|
|
* trigger lots and lots of calls to update the header block, which
|
|
* adds seeks and slows things down.
|
|
*
|
|
* This function tries to clear out a large chunk of the journal lists
|
|
* at once, which makes everything faster since only the newest journal
|
|
* list updates the header block
|
|
*/
|
|
static int flush_used_journal_lists(struct super_block *s,
|
|
struct reiserfs_journal_list *jl)
|
|
{
|
|
unsigned long len = 0;
|
|
unsigned long cur_len;
|
|
int ret;
|
|
int i;
|
|
int limit = 256;
|
|
struct reiserfs_journal_list *tjl;
|
|
struct reiserfs_journal_list *flush_jl;
|
|
unsigned int trans_id;
|
|
struct reiserfs_journal *journal = SB_JOURNAL(s);
|
|
|
|
flush_jl = tjl = jl;
|
|
|
|
/* in data logging mode, try harder to flush a lot of blocks */
|
|
if (reiserfs_data_log(s))
|
|
limit = 1024;
|
|
/* flush for 256 transactions or limit blocks, whichever comes first */
|
|
for (i = 0; i < 256 && len < limit; i++) {
|
|
if (atomic_read(&tjl->j_commit_left) ||
|
|
tjl->j_trans_id < jl->j_trans_id) {
|
|
break;
|
|
}
|
|
cur_len = atomic_read(&tjl->j_nonzerolen);
|
|
if (cur_len > 0) {
|
|
tjl->j_state &= ~LIST_TOUCHED;
|
|
}
|
|
len += cur_len;
|
|
flush_jl = tjl;
|
|
if (tjl->j_list.next == &journal->j_journal_list)
|
|
break;
|
|
tjl = JOURNAL_LIST_ENTRY(tjl->j_list.next);
|
|
}
|
|
get_journal_list(jl);
|
|
get_journal_list(flush_jl);
|
|
|
|
/*
|
|
* try to find a group of blocks we can flush across all the
|
|
* transactions, but only bother if we've actually spanned
|
|
* across multiple lists
|
|
*/
|
|
if (flush_jl != jl) {
|
|
ret = kupdate_transactions(s, jl, &tjl, &trans_id, len, i);
|
|
}
|
|
flush_journal_list(s, flush_jl, 1);
|
|
put_journal_list(s, flush_jl);
|
|
put_journal_list(s, jl);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* removes any nodes in table with name block and dev as bh.
|
|
* only touchs the hnext and hprev pointers.
|
|
*/
|
|
void remove_journal_hash(struct super_block *sb,
|
|
struct reiserfs_journal_cnode **table,
|
|
struct reiserfs_journal_list *jl,
|
|
unsigned long block, int remove_freed)
|
|
{
|
|
struct reiserfs_journal_cnode *cur;
|
|
struct reiserfs_journal_cnode **head;
|
|
|
|
head = &(journal_hash(table, sb, block));
|
|
if (!head) {
|
|
return;
|
|
}
|
|
cur = *head;
|
|
while (cur) {
|
|
if (cur->blocknr == block && cur->sb == sb
|
|
&& (jl == NULL || jl == cur->jlist)
|
|
&& (!test_bit(BLOCK_FREED, &cur->state) || remove_freed)) {
|
|
if (cur->hnext) {
|
|
cur->hnext->hprev = cur->hprev;
|
|
}
|
|
if (cur->hprev) {
|
|
cur->hprev->hnext = cur->hnext;
|
|
} else {
|
|
*head = cur->hnext;
|
|
}
|
|
cur->blocknr = 0;
|
|
cur->sb = NULL;
|
|
cur->state = 0;
|
|
/*
|
|
* anybody who clears the cur->bh will also
|
|
* dec the nonzerolen
|
|
*/
|
|
if (cur->bh && cur->jlist)
|
|
atomic_dec(&cur->jlist->j_nonzerolen);
|
|
cur->bh = NULL;
|
|
cur->jlist = NULL;
|
|
}
|
|
cur = cur->hnext;
|
|
}
|
|
}
|
|
|
|
static void free_journal_ram(struct super_block *sb)
|
|
{
|
|
struct reiserfs_journal *journal = SB_JOURNAL(sb);
|
|
kfree(journal->j_current_jl);
|
|
journal->j_num_lists--;
|
|
|
|
vfree(journal->j_cnode_free_orig);
|
|
free_list_bitmaps(sb, journal->j_list_bitmap);
|
|
free_bitmap_nodes(sb); /* must be after free_list_bitmaps */
|
|
if (journal->j_header_bh) {
|
|
brelse(journal->j_header_bh);
|
|
}
|
|
/*
|
|
* j_header_bh is on the journal dev, make sure
|
|
* not to release the journal dev until we brelse j_header_bh
|
|
*/
|
|
release_journal_dev(sb, journal);
|
|
vfree(journal);
|
|
}
|
|
|
|
/*
|
|
* call on unmount. Only set error to 1 if you haven't made your way out
|
|
* of read_super() yet. Any other caller must keep error at 0.
|
|
*/
|
|
static int do_journal_release(struct reiserfs_transaction_handle *th,
|
|
struct super_block *sb, int error)
|
|
{
|
|
struct reiserfs_transaction_handle myth;
|
|
int flushed = 0;
|
|
struct reiserfs_journal *journal = SB_JOURNAL(sb);
|
|
|
|
/*
|
|
* we only want to flush out transactions if we were
|
|
* called with error == 0
|
|
*/
|
|
if (!error && !(sb->s_flags & MS_RDONLY)) {
|
|
/* end the current trans */
|
|
BUG_ON(!th->t_trans_id);
|
|
do_journal_end(th, FLUSH_ALL);
|
|
|
|
/*
|
|
* make sure something gets logged to force
|
|
* our way into the flush code
|
|
*/
|
|
if (!journal_join(&myth, sb)) {
|
|
reiserfs_prepare_for_journal(sb,
|
|
SB_BUFFER_WITH_SB(sb),
|
|
1);
|
|
journal_mark_dirty(&myth, SB_BUFFER_WITH_SB(sb));
|
|
do_journal_end(&myth, FLUSH_ALL);
|
|
flushed = 1;
|
|
}
|
|
}
|
|
|
|
/* this also catches errors during the do_journal_end above */
|
|
if (!error && reiserfs_is_journal_aborted(journal)) {
|
|
memset(&myth, 0, sizeof(myth));
|
|
if (!journal_join_abort(&myth, sb)) {
|
|
reiserfs_prepare_for_journal(sb,
|
|
SB_BUFFER_WITH_SB(sb),
|
|
1);
|
|
journal_mark_dirty(&myth, SB_BUFFER_WITH_SB(sb));
|
|
do_journal_end(&myth, FLUSH_ALL);
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* We must release the write lock here because
|
|
* the workqueue job (flush_async_commit) needs this lock
|
|
*/
|
|
reiserfs_write_unlock(sb);
|
|
|
|
/*
|
|
* Cancel flushing of old commits. Note that neither of these works
|
|
* will be requeued because superblock is being shutdown and doesn't
|
|
* have MS_ACTIVE set.
|
|
*/
|
|
cancel_delayed_work_sync(&REISERFS_SB(sb)->old_work);
|
|
/* wait for all commits to finish */
|
|
cancel_delayed_work_sync(&SB_JOURNAL(sb)->j_work);
|
|
|
|
free_journal_ram(sb);
|
|
|
|
reiserfs_write_lock(sb);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* * call on unmount. flush all journal trans, release all alloc'd ram */
|
|
int journal_release(struct reiserfs_transaction_handle *th,
|
|
struct super_block *sb)
|
|
{
|
|
return do_journal_release(th, sb, 0);
|
|
}
|
|
|
|
/* only call from an error condition inside reiserfs_read_super! */
|
|
int journal_release_error(struct reiserfs_transaction_handle *th,
|
|
struct super_block *sb)
|
|
{
|
|
return do_journal_release(th, sb, 1);
|
|
}
|
|
|
|
/*
|
|
* compares description block with commit block.
|
|
* returns 1 if they differ, 0 if they are the same
|
|
*/
|
|
static int journal_compare_desc_commit(struct super_block *sb,
|
|
struct reiserfs_journal_desc *desc,
|
|
struct reiserfs_journal_commit *commit)
|
|
{
|
|
if (get_commit_trans_id(commit) != get_desc_trans_id(desc) ||
|
|
get_commit_trans_len(commit) != get_desc_trans_len(desc) ||
|
|
get_commit_trans_len(commit) > SB_JOURNAL(sb)->j_trans_max ||
|
|
get_commit_trans_len(commit) <= 0) {
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* returns 0 if it did not find a description block
|
|
* returns -1 if it found a corrupt commit block
|
|
* returns 1 if both desc and commit were valid
|
|
* NOTE: only called during fs mount
|
|
*/
|
|
static int journal_transaction_is_valid(struct super_block *sb,
|
|
struct buffer_head *d_bh,
|
|
unsigned int *oldest_invalid_trans_id,
|
|
unsigned long *newest_mount_id)
|
|
{
|
|
struct reiserfs_journal_desc *desc;
|
|
struct reiserfs_journal_commit *commit;
|
|
struct buffer_head *c_bh;
|
|
unsigned long offset;
|
|
|
|
if (!d_bh)
|
|
return 0;
|
|
|
|
desc = (struct reiserfs_journal_desc *)d_bh->b_data;
|
|
if (get_desc_trans_len(desc) > 0
|
|
&& !memcmp(get_journal_desc_magic(d_bh), JOURNAL_DESC_MAGIC, 8)) {
|
|
if (oldest_invalid_trans_id && *oldest_invalid_trans_id
|
|
&& get_desc_trans_id(desc) > *oldest_invalid_trans_id) {
|
|
reiserfs_debug(sb, REISERFS_DEBUG_CODE,
|
|
"journal-986: transaction "
|
|
"is valid returning because trans_id %d is greater than "
|
|
"oldest_invalid %lu",
|
|
get_desc_trans_id(desc),
|
|
*oldest_invalid_trans_id);
|
|
return 0;
|
|
}
|
|
if (newest_mount_id
|
|
&& *newest_mount_id > get_desc_mount_id(desc)) {
|
|
reiserfs_debug(sb, REISERFS_DEBUG_CODE,
|
|
"journal-1087: transaction "
|
|
"is valid returning because mount_id %d is less than "
|
|
"newest_mount_id %lu",
|
|
get_desc_mount_id(desc),
|
|
*newest_mount_id);
|
|
return -1;
|
|
}
|
|
if (get_desc_trans_len(desc) > SB_JOURNAL(sb)->j_trans_max) {
|
|
reiserfs_warning(sb, "journal-2018",
|
|
"Bad transaction length %d "
|
|
"encountered, ignoring transaction",
|
|
get_desc_trans_len(desc));
|
|
return -1;
|
|
}
|
|
offset = d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb);
|
|
|
|
/*
|
|
* ok, we have a journal description block,
|
|
* let's see if the transaction was valid
|
|
*/
|
|
c_bh =
|
|
journal_bread(sb,
|
|
SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
|
|
((offset + get_desc_trans_len(desc) +
|
|
1) % SB_ONDISK_JOURNAL_SIZE(sb)));
|
|
if (!c_bh)
|
|
return 0;
|
|
commit = (struct reiserfs_journal_commit *)c_bh->b_data;
|
|
if (journal_compare_desc_commit(sb, desc, commit)) {
|
|
reiserfs_debug(sb, REISERFS_DEBUG_CODE,
|
|
"journal_transaction_is_valid, commit offset %ld had bad "
|
|
"time %d or length %d",
|
|
c_bh->b_blocknr -
|
|
SB_ONDISK_JOURNAL_1st_BLOCK(sb),
|
|
get_commit_trans_id(commit),
|
|
get_commit_trans_len(commit));
|
|
brelse(c_bh);
|
|
if (oldest_invalid_trans_id) {
|
|
*oldest_invalid_trans_id =
|
|
get_desc_trans_id(desc);
|
|
reiserfs_debug(sb, REISERFS_DEBUG_CODE,
|
|
"journal-1004: "
|
|
"transaction_is_valid setting oldest invalid trans_id "
|
|
"to %d",
|
|
get_desc_trans_id(desc));
|
|
}
|
|
return -1;
|
|
}
|
|
brelse(c_bh);
|
|
reiserfs_debug(sb, REISERFS_DEBUG_CODE,
|
|
"journal-1006: found valid "
|
|
"transaction start offset %llu, len %d id %d",
|
|
d_bh->b_blocknr -
|
|
SB_ONDISK_JOURNAL_1st_BLOCK(sb),
|
|
get_desc_trans_len(desc),
|
|
get_desc_trans_id(desc));
|
|
return 1;
|
|
} else {
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
static void brelse_array(struct buffer_head **heads, int num)
|
|
{
|
|
int i;
|
|
for (i = 0; i < num; i++) {
|
|
brelse(heads[i]);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* given the start, and values for the oldest acceptable transactions,
|
|
* this either reads in a replays a transaction, or returns because the
|
|
* transaction is invalid, or too old.
|
|
* NOTE: only called during fs mount
|
|
*/
|
|
static int journal_read_transaction(struct super_block *sb,
|
|
unsigned long cur_dblock,
|
|
unsigned long oldest_start,
|
|
unsigned int oldest_trans_id,
|
|
unsigned long newest_mount_id)
|
|
{
|
|
struct reiserfs_journal *journal = SB_JOURNAL(sb);
|
|
struct reiserfs_journal_desc *desc;
|
|
struct reiserfs_journal_commit *commit;
|
|
unsigned int trans_id = 0;
|
|
struct buffer_head *c_bh;
|
|
struct buffer_head *d_bh;
|
|
struct buffer_head **log_blocks = NULL;
|
|
struct buffer_head **real_blocks = NULL;
|
|
unsigned int trans_offset;
|
|
int i;
|
|
int trans_half;
|
|
|
|
d_bh = journal_bread(sb, cur_dblock);
|
|
if (!d_bh)
|
|
return 1;
|
|
desc = (struct reiserfs_journal_desc *)d_bh->b_data;
|
|
trans_offset = d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb);
|
|
reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1037: "
|
|
"journal_read_transaction, offset %llu, len %d mount_id %d",
|
|
d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb),
|
|
get_desc_trans_len(desc), get_desc_mount_id(desc));
|
|
if (get_desc_trans_id(desc) < oldest_trans_id) {
|
|
reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1039: "
|
|
"journal_read_trans skipping because %lu is too old",
|
|
cur_dblock -
|
|
SB_ONDISK_JOURNAL_1st_BLOCK(sb));
|
|
brelse(d_bh);
|
|
return 1;
|
|
}
|
|
if (get_desc_mount_id(desc) != newest_mount_id) {
|
|
reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1146: "
|
|
"journal_read_trans skipping because %d is != "
|
|
"newest_mount_id %lu", get_desc_mount_id(desc),
|
|
newest_mount_id);
|
|
brelse(d_bh);
|
|
return 1;
|
|
}
|
|
c_bh = journal_bread(sb, SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
|
|
((trans_offset + get_desc_trans_len(desc) + 1) %
|
|
SB_ONDISK_JOURNAL_SIZE(sb)));
|
|
if (!c_bh) {
|
|
brelse(d_bh);
|
|
return 1;
|
|
}
|
|
commit = (struct reiserfs_journal_commit *)c_bh->b_data;
|
|
if (journal_compare_desc_commit(sb, desc, commit)) {
|
|
reiserfs_debug(sb, REISERFS_DEBUG_CODE,
|
|
"journal_read_transaction, "
|
|
"commit offset %llu had bad time %d or length %d",
|
|
c_bh->b_blocknr -
|
|
SB_ONDISK_JOURNAL_1st_BLOCK(sb),
|
|
get_commit_trans_id(commit),
|
|
get_commit_trans_len(commit));
|
|
brelse(c_bh);
|
|
brelse(d_bh);
|
|
return 1;
|
|
}
|
|
|
|
if (bdev_read_only(sb->s_bdev)) {
|
|
reiserfs_warning(sb, "clm-2076",
|
|
"device is readonly, unable to replay log");
|
|
brelse(c_bh);
|
|
brelse(d_bh);
|
|
return -EROFS;
|
|
}
|
|
|
|
trans_id = get_desc_trans_id(desc);
|
|
/*
|
|
* now we know we've got a good transaction, and it was
|
|
* inside the valid time ranges
|
|
*/
|
|
log_blocks = kmalloc(get_desc_trans_len(desc) *
|
|
sizeof(struct buffer_head *), GFP_NOFS);
|
|
real_blocks = kmalloc(get_desc_trans_len(desc) *
|
|
sizeof(struct buffer_head *), GFP_NOFS);
|
|
if (!log_blocks || !real_blocks) {
|
|
brelse(c_bh);
|
|
brelse(d_bh);
|
|
kfree(log_blocks);
|
|
kfree(real_blocks);
|
|
reiserfs_warning(sb, "journal-1169",
|
|
"kmalloc failed, unable to mount FS");
|
|
return -1;
|
|
}
|
|
/* get all the buffer heads */
|
|
trans_half = journal_trans_half(sb->s_blocksize);
|
|
for (i = 0; i < get_desc_trans_len(desc); i++) {
|
|
log_blocks[i] =
|
|
journal_getblk(sb,
|
|
SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
|
|
(trans_offset + 1 +
|
|
i) % SB_ONDISK_JOURNAL_SIZE(sb));
|
|
if (i < trans_half) {
|
|
real_blocks[i] =
|
|
sb_getblk(sb,
|
|
le32_to_cpu(desc->j_realblock[i]));
|
|
} else {
|
|
real_blocks[i] =
|
|
sb_getblk(sb,
|
|
le32_to_cpu(commit->
|
|
j_realblock[i - trans_half]));
|
|
}
|
|
if (real_blocks[i]->b_blocknr > SB_BLOCK_COUNT(sb)) {
|
|
reiserfs_warning(sb, "journal-1207",
|
|
"REPLAY FAILURE fsck required! "
|
|
"Block to replay is outside of "
|
|
"filesystem");
|
|
goto abort_replay;
|
|
}
|
|
/* make sure we don't try to replay onto log or reserved area */
|
|
if (is_block_in_log_or_reserved_area
|
|
(sb, real_blocks[i]->b_blocknr)) {
|
|
reiserfs_warning(sb, "journal-1204",
|
|
"REPLAY FAILURE fsck required! "
|
|
"Trying to replay onto a log block");
|
|
abort_replay:
|
|
brelse_array(log_blocks, i);
|
|
brelse_array(real_blocks, i);
|
|
brelse(c_bh);
|
|
brelse(d_bh);
|
|
kfree(log_blocks);
|
|
kfree(real_blocks);
|
|
return -1;
|
|
}
|
|
}
|
|
/* read in the log blocks, memcpy to the corresponding real block */
|
|
ll_rw_block(READ, get_desc_trans_len(desc), log_blocks);
|
|
for (i = 0; i < get_desc_trans_len(desc); i++) {
|
|
|
|
wait_on_buffer(log_blocks[i]);
|
|
if (!buffer_uptodate(log_blocks[i])) {
|
|
reiserfs_warning(sb, "journal-1212",
|
|
"REPLAY FAILURE fsck required! "
|
|
"buffer write failed");
|
|
brelse_array(log_blocks + i,
|
|
get_desc_trans_len(desc) - i);
|
|
brelse_array(real_blocks, get_desc_trans_len(desc));
|
|
brelse(c_bh);
|
|
brelse(d_bh);
|
|
kfree(log_blocks);
|
|
kfree(real_blocks);
|
|
return -1;
|
|
}
|
|
memcpy(real_blocks[i]->b_data, log_blocks[i]->b_data,
|
|
real_blocks[i]->b_size);
|
|
set_buffer_uptodate(real_blocks[i]);
|
|
brelse(log_blocks[i]);
|
|
}
|
|
/* flush out the real blocks */
|
|
for (i = 0; i < get_desc_trans_len(desc); i++) {
|
|
set_buffer_dirty(real_blocks[i]);
|
|
write_dirty_buffer(real_blocks[i], WRITE);
|
|
}
|
|
for (i = 0; i < get_desc_trans_len(desc); i++) {
|
|
wait_on_buffer(real_blocks[i]);
|
|
if (!buffer_uptodate(real_blocks[i])) {
|
|
reiserfs_warning(sb, "journal-1226",
|
|
"REPLAY FAILURE, fsck required! "
|
|
"buffer write failed");
|
|
brelse_array(real_blocks + i,
|
|
get_desc_trans_len(desc) - i);
|
|
brelse(c_bh);
|
|
brelse(d_bh);
|
|
kfree(log_blocks);
|
|
kfree(real_blocks);
|
|
return -1;
|
|
}
|
|
brelse(real_blocks[i]);
|
|
}
|
|
cur_dblock =
|
|
SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
|
|
((trans_offset + get_desc_trans_len(desc) +
|
|
2) % SB_ONDISK_JOURNAL_SIZE(sb));
|
|
reiserfs_debug(sb, REISERFS_DEBUG_CODE,
|
|
"journal-1095: setting journal " "start to offset %ld",
|
|
cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb));
|
|
|
|
/*
|
|
* init starting values for the first transaction, in case
|
|
* this is the last transaction to be replayed.
|
|
*/
|
|
journal->j_start = cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb);
|
|
journal->j_last_flush_trans_id = trans_id;
|
|
journal->j_trans_id = trans_id + 1;
|
|
/* check for trans_id overflow */
|
|
if (journal->j_trans_id == 0)
|
|
journal->j_trans_id = 10;
|
|
brelse(c_bh);
|
|
brelse(d_bh);
|
|
kfree(log_blocks);
|
|
kfree(real_blocks);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* This function reads blocks starting from block and to max_block of bufsize
|
|
* size (but no more than BUFNR blocks at a time). This proved to improve
|
|
* mounting speed on self-rebuilding raid5 arrays at least.
|
|
* Right now it is only used from journal code. But later we might use it
|
|
* from other places.
|
|
* Note: Do not use journal_getblk/sb_getblk functions here!
|
|
*/
|
|
static struct buffer_head *reiserfs_breada(struct block_device *dev,
|
|
b_blocknr_t block, int bufsize,
|
|
b_blocknr_t max_block)
|
|
{
|
|
struct buffer_head *bhlist[BUFNR];
|
|
unsigned int blocks = BUFNR;
|
|
struct buffer_head *bh;
|
|
int i, j;
|
|
|
|
bh = __getblk(dev, block, bufsize);
|
|
if (buffer_uptodate(bh))
|
|
return (bh);
|
|
|
|
if (block + BUFNR > max_block) {
|
|
blocks = max_block - block;
|
|
}
|
|
bhlist[0] = bh;
|
|
j = 1;
|
|
for (i = 1; i < blocks; i++) {
|
|
bh = __getblk(dev, block + i, bufsize);
|
|
if (buffer_uptodate(bh)) {
|
|
brelse(bh);
|
|
break;
|
|
} else
|
|
bhlist[j++] = bh;
|
|
}
|
|
ll_rw_block(READ, j, bhlist);
|
|
for (i = 1; i < j; i++)
|
|
brelse(bhlist[i]);
|
|
bh = bhlist[0];
|
|
wait_on_buffer(bh);
|
|
if (buffer_uptodate(bh))
|
|
return bh;
|
|
brelse(bh);
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* read and replay the log
|
|
* on a clean unmount, the journal header's next unflushed pointer will be
|
|
* to an invalid transaction. This tests that before finding all the
|
|
* transactions in the log, which makes normal mount times fast.
|
|
*
|
|
* After a crash, this starts with the next unflushed transaction, and
|
|
* replays until it finds one too old, or invalid.
|
|
*
|
|
* On exit, it sets things up so the first transaction will work correctly.
|
|
* NOTE: only called during fs mount
|
|
*/
|
|
static int journal_read(struct super_block *sb)
|
|
{
|
|
struct reiserfs_journal *journal = SB_JOURNAL(sb);
|
|
struct reiserfs_journal_desc *desc;
|
|
unsigned int oldest_trans_id = 0;
|
|
unsigned int oldest_invalid_trans_id = 0;
|
|
time_t start;
|
|
unsigned long oldest_start = 0;
|
|
unsigned long cur_dblock = 0;
|
|
unsigned long newest_mount_id = 9;
|
|
struct buffer_head *d_bh;
|
|
struct reiserfs_journal_header *jh;
|
|
int valid_journal_header = 0;
|
|
int replay_count = 0;
|
|
int continue_replay = 1;
|
|
int ret;
|
|
char b[BDEVNAME_SIZE];
|
|
|
|
cur_dblock = SB_ONDISK_JOURNAL_1st_BLOCK(sb);
|
|
reiserfs_info(sb, "checking transaction log (%s)\n",
|
|
bdevname(journal->j_dev_bd, b));
|
|
start = get_seconds();
|
|
|
|
/*
|
|
* step 1, read in the journal header block. Check the transaction
|
|
* it says is the first unflushed, and if that transaction is not
|
|
* valid, replay is done
|
|
*/
|
|
journal->j_header_bh = journal_bread(sb,
|
|
SB_ONDISK_JOURNAL_1st_BLOCK(sb)
|
|
+ SB_ONDISK_JOURNAL_SIZE(sb));
|
|
if (!journal->j_header_bh) {
|
|
return 1;
|
|
}
|
|
jh = (struct reiserfs_journal_header *)(journal->j_header_bh->b_data);
|
|
if (le32_to_cpu(jh->j_first_unflushed_offset) <
|
|
SB_ONDISK_JOURNAL_SIZE(sb)
|
|
&& le32_to_cpu(jh->j_last_flush_trans_id) > 0) {
|
|
oldest_start =
|
|
SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
|
|
le32_to_cpu(jh->j_first_unflushed_offset);
|
|
oldest_trans_id = le32_to_cpu(jh->j_last_flush_trans_id) + 1;
|
|
newest_mount_id = le32_to_cpu(jh->j_mount_id);
|
|
reiserfs_debug(sb, REISERFS_DEBUG_CODE,
|
|
"journal-1153: found in "
|
|
"header: first_unflushed_offset %d, last_flushed_trans_id "
|
|
"%lu", le32_to_cpu(jh->j_first_unflushed_offset),
|
|
le32_to_cpu(jh->j_last_flush_trans_id));
|
|
valid_journal_header = 1;
|
|
|
|
/*
|
|
* now, we try to read the first unflushed offset. If it
|
|
* is not valid, there is nothing more we can do, and it
|
|
* makes no sense to read through the whole log.
|
|
*/
|
|
d_bh =
|
|
journal_bread(sb,
|
|
SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
|
|
le32_to_cpu(jh->j_first_unflushed_offset));
|
|
ret = journal_transaction_is_valid(sb, d_bh, NULL, NULL);
|
|
if (!ret) {
|
|
continue_replay = 0;
|
|
}
|
|
brelse(d_bh);
|
|
goto start_log_replay;
|
|
}
|
|
|
|
/*
|
|
* ok, there are transactions that need to be replayed. start
|
|
* with the first log block, find all the valid transactions, and
|
|
* pick out the oldest.
|
|
*/
|
|
while (continue_replay
|
|
&& cur_dblock <
|
|
(SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
|
|
SB_ONDISK_JOURNAL_SIZE(sb))) {
|
|
/*
|
|
* Note that it is required for blocksize of primary fs
|
|
* device and journal device to be the same
|
|
*/
|
|
d_bh =
|
|
reiserfs_breada(journal->j_dev_bd, cur_dblock,
|
|
sb->s_blocksize,
|
|
SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
|
|
SB_ONDISK_JOURNAL_SIZE(sb));
|
|
ret =
|
|
journal_transaction_is_valid(sb, d_bh,
|
|
&oldest_invalid_trans_id,
|
|
&newest_mount_id);
|
|
if (ret == 1) {
|
|
desc = (struct reiserfs_journal_desc *)d_bh->b_data;
|
|
if (oldest_start == 0) { /* init all oldest_ values */
|
|
oldest_trans_id = get_desc_trans_id(desc);
|
|
oldest_start = d_bh->b_blocknr;
|
|
newest_mount_id = get_desc_mount_id(desc);
|
|
reiserfs_debug(sb, REISERFS_DEBUG_CODE,
|
|
"journal-1179: Setting "
|
|
"oldest_start to offset %llu, trans_id %lu",
|
|
oldest_start -
|
|
SB_ONDISK_JOURNAL_1st_BLOCK
|
|
(sb), oldest_trans_id);
|
|
} else if (oldest_trans_id > get_desc_trans_id(desc)) {
|
|
/* one we just read was older */
|
|
oldest_trans_id = get_desc_trans_id(desc);
|
|
oldest_start = d_bh->b_blocknr;
|
|
reiserfs_debug(sb, REISERFS_DEBUG_CODE,
|
|
"journal-1180: Resetting "
|
|
"oldest_start to offset %lu, trans_id %lu",
|
|
oldest_start -
|
|
SB_ONDISK_JOURNAL_1st_BLOCK
|
|
(sb), oldest_trans_id);
|
|
}
|
|
if (newest_mount_id < get_desc_mount_id(desc)) {
|
|
newest_mount_id = get_desc_mount_id(desc);
|
|
reiserfs_debug(sb, REISERFS_DEBUG_CODE,
|
|
"journal-1299: Setting "
|
|
"newest_mount_id to %d",
|
|
get_desc_mount_id(desc));
|
|
}
|
|
cur_dblock += get_desc_trans_len(desc) + 2;
|
|
} else {
|
|
cur_dblock++;
|
|
}
|
|
brelse(d_bh);
|
|
}
|
|
|
|
start_log_replay:
|
|
cur_dblock = oldest_start;
|
|
if (oldest_trans_id) {
|
|
reiserfs_debug(sb, REISERFS_DEBUG_CODE,
|
|
"journal-1206: Starting replay "
|
|
"from offset %llu, trans_id %lu",
|
|
cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb),
|
|
oldest_trans_id);
|
|
|
|
}
|
|
replay_count = 0;
|
|
while (continue_replay && oldest_trans_id > 0) {
|
|
ret =
|
|
journal_read_transaction(sb, cur_dblock, oldest_start,
|
|
oldest_trans_id, newest_mount_id);
|
|
if (ret < 0) {
|
|
return ret;
|
|
} else if (ret != 0) {
|
|
break;
|
|
}
|
|
cur_dblock =
|
|
SB_ONDISK_JOURNAL_1st_BLOCK(sb) + journal->j_start;
|
|
replay_count++;
|
|
if (cur_dblock == oldest_start)
|
|
break;
|
|
}
|
|
|
|
if (oldest_trans_id == 0) {
|
|
reiserfs_debug(sb, REISERFS_DEBUG_CODE,
|
|
"journal-1225: No valid " "transactions found");
|
|
}
|
|
/*
|
|
* j_start does not get set correctly if we don't replay any
|
|
* transactions. if we had a valid journal_header, set j_start
|
|
* to the first unflushed transaction value, copy the trans_id
|
|
* from the header
|
|
*/
|
|
if (valid_journal_header && replay_count == 0) {
|
|
journal->j_start = le32_to_cpu(jh->j_first_unflushed_offset);
|
|
journal->j_trans_id =
|
|
le32_to_cpu(jh->j_last_flush_trans_id) + 1;
|
|
/* check for trans_id overflow */
|
|
if (journal->j_trans_id == 0)
|
|
journal->j_trans_id = 10;
|
|
journal->j_last_flush_trans_id =
|
|
le32_to_cpu(jh->j_last_flush_trans_id);
|
|
journal->j_mount_id = le32_to_cpu(jh->j_mount_id) + 1;
|
|
} else {
|
|
journal->j_mount_id = newest_mount_id + 1;
|
|
}
|
|
reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1299: Setting "
|
|
"newest_mount_id to %lu", journal->j_mount_id);
|
|
journal->j_first_unflushed_offset = journal->j_start;
|
|
if (replay_count > 0) {
|
|
reiserfs_info(sb,
|
|
"replayed %d transactions in %lu seconds\n",
|
|
replay_count, get_seconds() - start);
|
|
}
|
|
/* needed to satisfy the locking in _update_journal_header_block */
|
|
reiserfs_write_lock(sb);
|
|
if (!bdev_read_only(sb->s_bdev) &&
|
|
_update_journal_header_block(sb, journal->j_start,
|
|
journal->j_last_flush_trans_id)) {
|
|
reiserfs_write_unlock(sb);
|
|
/*
|
|
* replay failed, caller must call free_journal_ram and abort
|
|
* the mount
|
|
*/
|
|
return -1;
|
|
}
|
|
reiserfs_write_unlock(sb);
|
|
return 0;
|
|
}
|
|
|
|
static struct reiserfs_journal_list *alloc_journal_list(struct super_block *s)
|
|
{
|
|
struct reiserfs_journal_list *jl;
|
|
jl = kzalloc(sizeof(struct reiserfs_journal_list),
|
|
GFP_NOFS | __GFP_NOFAIL);
|
|
INIT_LIST_HEAD(&jl->j_list);
|
|
INIT_LIST_HEAD(&jl->j_working_list);
|
|
INIT_LIST_HEAD(&jl->j_tail_bh_list);
|
|
INIT_LIST_HEAD(&jl->j_bh_list);
|
|
mutex_init(&jl->j_commit_mutex);
|
|
SB_JOURNAL(s)->j_num_lists++;
|
|
get_journal_list(jl);
|
|
return jl;
|
|
}
|
|
|
|
static void journal_list_init(struct super_block *sb)
|
|
{
|
|
SB_JOURNAL(sb)->j_current_jl = alloc_journal_list(sb);
|
|
}
|
|
|
|
static void release_journal_dev(struct super_block *super,
|
|
struct reiserfs_journal *journal)
|
|
{
|
|
if (journal->j_dev_bd != NULL) {
|
|
blkdev_put(journal->j_dev_bd, journal->j_dev_mode);
|
|
journal->j_dev_bd = NULL;
|
|
}
|
|
}
|
|
|
|
static int journal_init_dev(struct super_block *super,
|
|
struct reiserfs_journal *journal,
|
|
const char *jdev_name)
|
|
{
|
|
int result;
|
|
dev_t jdev;
|
|
fmode_t blkdev_mode = FMODE_READ | FMODE_WRITE | FMODE_EXCL;
|
|
char b[BDEVNAME_SIZE];
|
|
|
|
result = 0;
|
|
|
|
journal->j_dev_bd = NULL;
|
|
jdev = SB_ONDISK_JOURNAL_DEVICE(super) ?
|
|
new_decode_dev(SB_ONDISK_JOURNAL_DEVICE(super)) : super->s_dev;
|
|
|
|
if (bdev_read_only(super->s_bdev))
|
|
blkdev_mode = FMODE_READ;
|
|
|
|
/* there is no "jdev" option and journal is on separate device */
|
|
if ((!jdev_name || !jdev_name[0])) {
|
|
if (jdev == super->s_dev)
|
|
blkdev_mode &= ~FMODE_EXCL;
|
|
journal->j_dev_bd = blkdev_get_by_dev(jdev, blkdev_mode,
|
|
journal);
|
|
journal->j_dev_mode = blkdev_mode;
|
|
if (IS_ERR(journal->j_dev_bd)) {
|
|
result = PTR_ERR(journal->j_dev_bd);
|
|
journal->j_dev_bd = NULL;
|
|
reiserfs_warning(super, "sh-458",
|
|
"cannot init journal device '%s': %i",
|
|
__bdevname(jdev, b), result);
|
|
return result;
|
|
} else if (jdev != super->s_dev)
|
|
set_blocksize(journal->j_dev_bd, super->s_blocksize);
|
|
|
|
return 0;
|
|
}
|
|
|
|
journal->j_dev_mode = blkdev_mode;
|
|
journal->j_dev_bd = blkdev_get_by_path(jdev_name, blkdev_mode, journal);
|
|
if (IS_ERR(journal->j_dev_bd)) {
|
|
result = PTR_ERR(journal->j_dev_bd);
|
|
journal->j_dev_bd = NULL;
|
|
reiserfs_warning(super,
|
|
"journal_init_dev: Cannot open '%s': %i",
|
|
jdev_name, result);
|
|
return result;
|
|
}
|
|
|
|
set_blocksize(journal->j_dev_bd, super->s_blocksize);
|
|
reiserfs_info(super,
|
|
"journal_init_dev: journal device: %s\n",
|
|
bdevname(journal->j_dev_bd, b));
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* When creating/tuning a file system user can assign some
|
|
* journal params within boundaries which depend on the ratio
|
|
* blocksize/standard_blocksize.
|
|
*
|
|
* For blocks >= standard_blocksize transaction size should
|
|
* be not less then JOURNAL_TRANS_MIN_DEFAULT, and not more
|
|
* then JOURNAL_TRANS_MAX_DEFAULT.
|
|
*
|
|
* For blocks < standard_blocksize these boundaries should be
|
|
* decreased proportionally.
|
|
*/
|
|
#define REISERFS_STANDARD_BLKSIZE (4096)
|
|
|
|
static int check_advise_trans_params(struct super_block *sb,
|
|
struct reiserfs_journal *journal)
|
|
{
|
|
if (journal->j_trans_max) {
|
|
/* Non-default journal params. Do sanity check for them. */
|
|
int ratio = 1;
|
|
if (sb->s_blocksize < REISERFS_STANDARD_BLKSIZE)
|
|
ratio = REISERFS_STANDARD_BLKSIZE / sb->s_blocksize;
|
|
|
|
if (journal->j_trans_max > JOURNAL_TRANS_MAX_DEFAULT / ratio ||
|
|
journal->j_trans_max < JOURNAL_TRANS_MIN_DEFAULT / ratio ||
|
|
SB_ONDISK_JOURNAL_SIZE(sb) / journal->j_trans_max <
|
|
JOURNAL_MIN_RATIO) {
|
|
reiserfs_warning(sb, "sh-462",
|
|
"bad transaction max size (%u). "
|
|
"FSCK?", journal->j_trans_max);
|
|
return 1;
|
|
}
|
|
if (journal->j_max_batch != (journal->j_trans_max) *
|
|
JOURNAL_MAX_BATCH_DEFAULT/JOURNAL_TRANS_MAX_DEFAULT) {
|
|
reiserfs_warning(sb, "sh-463",
|
|
"bad transaction max batch (%u). "
|
|
"FSCK?", journal->j_max_batch);
|
|
return 1;
|
|
}
|
|
} else {
|
|
/*
|
|
* Default journal params.
|
|
* The file system was created by old version
|
|
* of mkreiserfs, so some fields contain zeros,
|
|
* and we need to advise proper values for them
|
|
*/
|
|
if (sb->s_blocksize != REISERFS_STANDARD_BLKSIZE) {
|
|
reiserfs_warning(sb, "sh-464", "bad blocksize (%u)",
|
|
sb->s_blocksize);
|
|
return 1;
|
|
}
|
|
journal->j_trans_max = JOURNAL_TRANS_MAX_DEFAULT;
|
|
journal->j_max_batch = JOURNAL_MAX_BATCH_DEFAULT;
|
|
journal->j_max_commit_age = JOURNAL_MAX_COMMIT_AGE;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* must be called once on fs mount. calls journal_read for you */
|
|
int journal_init(struct super_block *sb, const char *j_dev_name,
|
|
int old_format, unsigned int commit_max_age)
|
|
{
|
|
int num_cnodes = SB_ONDISK_JOURNAL_SIZE(sb) * 2;
|
|
struct buffer_head *bhjh;
|
|
struct reiserfs_super_block *rs;
|
|
struct reiserfs_journal_header *jh;
|
|
struct reiserfs_journal *journal;
|
|
struct reiserfs_journal_list *jl;
|
|
char b[BDEVNAME_SIZE];
|
|
int ret;
|
|
|
|
journal = SB_JOURNAL(sb) = vzalloc(sizeof(struct reiserfs_journal));
|
|
if (!journal) {
|
|
reiserfs_warning(sb, "journal-1256",
|
|
"unable to get memory for journal structure");
|
|
return 1;
|
|
}
|
|
INIT_LIST_HEAD(&journal->j_bitmap_nodes);
|
|
INIT_LIST_HEAD(&journal->j_prealloc_list);
|
|
INIT_LIST_HEAD(&journal->j_working_list);
|
|
INIT_LIST_HEAD(&journal->j_journal_list);
|
|
journal->j_persistent_trans = 0;
|
|
if (reiserfs_allocate_list_bitmaps(sb, journal->j_list_bitmap,
|
|
reiserfs_bmap_count(sb)))
|
|
goto free_and_return;
|
|
|
|
allocate_bitmap_nodes(sb);
|
|
|
|
/* reserved for journal area support */
|
|
SB_JOURNAL_1st_RESERVED_BLOCK(sb) = (old_format ?
|
|
REISERFS_OLD_DISK_OFFSET_IN_BYTES
|
|
/ sb->s_blocksize +
|
|
reiserfs_bmap_count(sb) +
|
|
1 :
|
|
REISERFS_DISK_OFFSET_IN_BYTES /
|
|
sb->s_blocksize + 2);
|
|
|
|
/*
|
|
* Sanity check to see is the standard journal fitting
|
|
* within first bitmap (actual for small blocksizes)
|
|
*/
|
|
if (!SB_ONDISK_JOURNAL_DEVICE(sb) &&
|
|
(SB_JOURNAL_1st_RESERVED_BLOCK(sb) +
|
|
SB_ONDISK_JOURNAL_SIZE(sb) > sb->s_blocksize * 8)) {
|
|
reiserfs_warning(sb, "journal-1393",
|
|
"journal does not fit for area addressed "
|
|
"by first of bitmap blocks. It starts at "
|
|
"%u and its size is %u. Block size %ld",
|
|
SB_JOURNAL_1st_RESERVED_BLOCK(sb),
|
|
SB_ONDISK_JOURNAL_SIZE(sb),
|
|
sb->s_blocksize);
|
|
goto free_and_return;
|
|
}
|
|
|
|
if (journal_init_dev(sb, journal, j_dev_name) != 0) {
|
|
reiserfs_warning(sb, "sh-462",
|
|
"unable to initialize journal device");
|
|
goto free_and_return;
|
|
}
|
|
|
|
rs = SB_DISK_SUPER_BLOCK(sb);
|
|
|
|
/* read journal header */
|
|
bhjh = journal_bread(sb,
|
|
SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
|
|
SB_ONDISK_JOURNAL_SIZE(sb));
|
|
if (!bhjh) {
|
|
reiserfs_warning(sb, "sh-459",
|
|
"unable to read journal header");
|
|
goto free_and_return;
|
|
}
|
|
jh = (struct reiserfs_journal_header *)(bhjh->b_data);
|
|
|
|
/* make sure that journal matches to the super block */
|
|
if (is_reiserfs_jr(rs)
|
|
&& (le32_to_cpu(jh->jh_journal.jp_journal_magic) !=
|
|
sb_jp_journal_magic(rs))) {
|
|
reiserfs_warning(sb, "sh-460",
|
|
"journal header magic %x (device %s) does "
|
|
"not match to magic found in super block %x",
|
|
jh->jh_journal.jp_journal_magic,
|
|
bdevname(journal->j_dev_bd, b),
|
|
sb_jp_journal_magic(rs));
|
|
brelse(bhjh);
|
|
goto free_and_return;
|
|
}
|
|
|
|
journal->j_trans_max = le32_to_cpu(jh->jh_journal.jp_journal_trans_max);
|
|
journal->j_max_batch = le32_to_cpu(jh->jh_journal.jp_journal_max_batch);
|
|
journal->j_max_commit_age =
|
|
le32_to_cpu(jh->jh_journal.jp_journal_max_commit_age);
|
|
journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
|
|
|
|
if (check_advise_trans_params(sb, journal) != 0)
|
|
goto free_and_return;
|
|
journal->j_default_max_commit_age = journal->j_max_commit_age;
|
|
|
|
if (commit_max_age != 0) {
|
|
journal->j_max_commit_age = commit_max_age;
|
|
journal->j_max_trans_age = commit_max_age;
|
|
}
|
|
|
|
reiserfs_info(sb, "journal params: device %s, size %u, "
|
|
"journal first block %u, max trans len %u, max batch %u, "
|
|
"max commit age %u, max trans age %u\n",
|
|
bdevname(journal->j_dev_bd, b),
|
|
SB_ONDISK_JOURNAL_SIZE(sb),
|
|
SB_ONDISK_JOURNAL_1st_BLOCK(sb),
|
|
journal->j_trans_max,
|
|
journal->j_max_batch,
|
|
journal->j_max_commit_age, journal->j_max_trans_age);
|
|
|
|
brelse(bhjh);
|
|
|
|
journal->j_list_bitmap_index = 0;
|
|
journal_list_init(sb);
|
|
|
|
memset(journal->j_list_hash_table, 0,
|
|
JOURNAL_HASH_SIZE * sizeof(struct reiserfs_journal_cnode *));
|
|
|
|
INIT_LIST_HEAD(&journal->j_dirty_buffers);
|
|
spin_lock_init(&journal->j_dirty_buffers_lock);
|
|
|
|
journal->j_start = 0;
|
|
journal->j_len = 0;
|
|
journal->j_len_alloc = 0;
|
|
atomic_set(&journal->j_wcount, 0);
|
|
atomic_set(&journal->j_async_throttle, 0);
|
|
journal->j_bcount = 0;
|
|
journal->j_trans_start_time = 0;
|
|
journal->j_last = NULL;
|
|
journal->j_first = NULL;
|
|
init_waitqueue_head(&journal->j_join_wait);
|
|
mutex_init(&journal->j_mutex);
|
|
mutex_init(&journal->j_flush_mutex);
|
|
|
|
journal->j_trans_id = 10;
|
|
journal->j_mount_id = 10;
|
|
journal->j_state = 0;
|
|
atomic_set(&journal->j_jlock, 0);
|
|
journal->j_cnode_free_list = allocate_cnodes(num_cnodes);
|
|
journal->j_cnode_free_orig = journal->j_cnode_free_list;
|
|
journal->j_cnode_free = journal->j_cnode_free_list ? num_cnodes : 0;
|
|
journal->j_cnode_used = 0;
|
|
journal->j_must_wait = 0;
|
|
|
|
if (journal->j_cnode_free == 0) {
|
|
reiserfs_warning(sb, "journal-2004", "Journal cnode memory "
|
|
"allocation failed (%ld bytes). Journal is "
|
|
"too large for available memory. Usually "
|
|
"this is due to a journal that is too large.",
|
|
sizeof (struct reiserfs_journal_cnode) * num_cnodes);
|
|
goto free_and_return;
|
|
}
|
|
|
|
init_journal_hash(sb);
|
|
jl = journal->j_current_jl;
|
|
|
|
/*
|
|
* get_list_bitmap() may call flush_commit_list() which
|
|
* requires the lock. Calling flush_commit_list() shouldn't happen
|
|
* this early but I like to be paranoid.
|
|
*/
|
|
reiserfs_write_lock(sb);
|
|
jl->j_list_bitmap = get_list_bitmap(sb, jl);
|
|
reiserfs_write_unlock(sb);
|
|
if (!jl->j_list_bitmap) {
|
|
reiserfs_warning(sb, "journal-2005",
|
|
"get_list_bitmap failed for journal list 0");
|
|
goto free_and_return;
|
|
}
|
|
|
|
ret = journal_read(sb);
|
|
if (ret < 0) {
|
|
reiserfs_warning(sb, "reiserfs-2006",
|
|
"Replay Failure, unable to mount");
|
|
goto free_and_return;
|
|
}
|
|
|
|
INIT_DELAYED_WORK(&journal->j_work, flush_async_commits);
|
|
journal->j_work_sb = sb;
|
|
return 0;
|
|
free_and_return:
|
|
free_journal_ram(sb);
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* test for a polite end of the current transaction. Used by file_write,
|
|
* and should be used by delete to make sure they don't write more than
|
|
* can fit inside a single transaction
|
|
*/
|
|
int journal_transaction_should_end(struct reiserfs_transaction_handle *th,
|
|
int new_alloc)
|
|
{
|
|
struct reiserfs_journal *journal = SB_JOURNAL(th->t_super);
|
|
time_t now = get_seconds();
|
|
/* cannot restart while nested */
|
|
BUG_ON(!th->t_trans_id);
|
|
if (th->t_refcount > 1)
|
|
return 0;
|
|
if (journal->j_must_wait > 0 ||
|
|
(journal->j_len_alloc + new_alloc) >= journal->j_max_batch ||
|
|
atomic_read(&journal->j_jlock) ||
|
|
(now - journal->j_trans_start_time) > journal->j_max_trans_age ||
|
|
journal->j_cnode_free < (journal->j_trans_max * 3)) {
|
|
return 1;
|
|
}
|
|
|
|
journal->j_len_alloc += new_alloc;
|
|
th->t_blocks_allocated += new_alloc ;
|
|
return 0;
|
|
}
|
|
|
|
/* this must be called inside a transaction */
|
|
void reiserfs_block_writes(struct reiserfs_transaction_handle *th)
|
|
{
|
|
struct reiserfs_journal *journal = SB_JOURNAL(th->t_super);
|
|
BUG_ON(!th->t_trans_id);
|
|
journal->j_must_wait = 1;
|
|
set_bit(J_WRITERS_BLOCKED, &journal->j_state);
|
|
return;
|
|
}
|
|
|
|
/* this must be called without a transaction started */
|
|
void reiserfs_allow_writes(struct super_block *s)
|
|
{
|
|
struct reiserfs_journal *journal = SB_JOURNAL(s);
|
|
clear_bit(J_WRITERS_BLOCKED, &journal->j_state);
|
|
wake_up(&journal->j_join_wait);
|
|
}
|
|
|
|
/* this must be called without a transaction started */
|
|
void reiserfs_wait_on_write_block(struct super_block *s)
|
|
{
|
|
struct reiserfs_journal *journal = SB_JOURNAL(s);
|
|
wait_event(journal->j_join_wait,
|
|
!test_bit(J_WRITERS_BLOCKED, &journal->j_state));
|
|
}
|
|
|
|
static void queue_log_writer(struct super_block *s)
|
|
{
|
|
wait_queue_t wait;
|
|
struct reiserfs_journal *journal = SB_JOURNAL(s);
|
|
set_bit(J_WRITERS_QUEUED, &journal->j_state);
|
|
|
|
/*
|
|
* we don't want to use wait_event here because
|
|
* we only want to wait once.
|
|
*/
|
|
init_waitqueue_entry(&wait, current);
|
|
add_wait_queue(&journal->j_join_wait, &wait);
|
|
set_current_state(TASK_UNINTERRUPTIBLE);
|
|
if (test_bit(J_WRITERS_QUEUED, &journal->j_state)) {
|
|
int depth = reiserfs_write_unlock_nested(s);
|
|
schedule();
|
|
reiserfs_write_lock_nested(s, depth);
|
|
}
|
|
__set_current_state(TASK_RUNNING);
|
|
remove_wait_queue(&journal->j_join_wait, &wait);
|
|
}
|
|
|
|
static void wake_queued_writers(struct super_block *s)
|
|
{
|
|
struct reiserfs_journal *journal = SB_JOURNAL(s);
|
|
if (test_and_clear_bit(J_WRITERS_QUEUED, &journal->j_state))
|
|
wake_up(&journal->j_join_wait);
|
|
}
|
|
|
|
static void let_transaction_grow(struct super_block *sb, unsigned int trans_id)
|
|
{
|
|
struct reiserfs_journal *journal = SB_JOURNAL(sb);
|
|
unsigned long bcount = journal->j_bcount;
|
|
while (1) {
|
|
int depth;
|
|
|
|
depth = reiserfs_write_unlock_nested(sb);
|
|
schedule_timeout_uninterruptible(1);
|
|
reiserfs_write_lock_nested(sb, depth);
|
|
|
|
journal->j_current_jl->j_state |= LIST_COMMIT_PENDING;
|
|
while ((atomic_read(&journal->j_wcount) > 0 ||
|
|
atomic_read(&journal->j_jlock)) &&
|
|
journal->j_trans_id == trans_id) {
|
|
queue_log_writer(sb);
|
|
}
|
|
if (journal->j_trans_id != trans_id)
|
|
break;
|
|
if (bcount == journal->j_bcount)
|
|
break;
|
|
bcount = journal->j_bcount;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* join == true if you must join an existing transaction.
|
|
* join == false if you can deal with waiting for others to finish
|
|
*
|
|
* this will block until the transaction is joinable. send the number of
|
|
* blocks you expect to use in nblocks.
|
|
*/
|
|
static int do_journal_begin_r(struct reiserfs_transaction_handle *th,
|
|
struct super_block *sb, unsigned long nblocks,
|
|
int join)
|
|
{
|
|
time_t now = get_seconds();
|
|
unsigned int old_trans_id;
|
|
struct reiserfs_journal *journal = SB_JOURNAL(sb);
|
|
struct reiserfs_transaction_handle myth;
|
|
int sched_count = 0;
|
|
int retval;
|
|
int depth;
|
|
|
|
reiserfs_check_lock_depth(sb, "journal_begin");
|
|
BUG_ON(nblocks > journal->j_trans_max);
|
|
|
|
PROC_INFO_INC(sb, journal.journal_being);
|
|
/* set here for journal_join */
|
|
th->t_refcount = 1;
|
|
th->t_super = sb;
|
|
|
|
relock:
|
|
lock_journal(sb);
|
|
if (join != JBEGIN_ABORT && reiserfs_is_journal_aborted(journal)) {
|
|
unlock_journal(sb);
|
|
retval = journal->j_errno;
|
|
goto out_fail;
|
|
}
|
|
journal->j_bcount++;
|
|
|
|
if (test_bit(J_WRITERS_BLOCKED, &journal->j_state)) {
|
|
unlock_journal(sb);
|
|
depth = reiserfs_write_unlock_nested(sb);
|
|
reiserfs_wait_on_write_block(sb);
|
|
reiserfs_write_lock_nested(sb, depth);
|
|
PROC_INFO_INC(sb, journal.journal_relock_writers);
|
|
goto relock;
|
|
}
|
|
now = get_seconds();
|
|
|
|
/*
|
|
* if there is no room in the journal OR
|
|
* if this transaction is too old, and we weren't called joinable,
|
|
* wait for it to finish before beginning we don't sleep if there
|
|
* aren't other writers
|
|
*/
|
|
|
|
if ((!join && journal->j_must_wait > 0) ||
|
|
(!join
|
|
&& (journal->j_len_alloc + nblocks + 2) >= journal->j_max_batch)
|
|
|| (!join && atomic_read(&journal->j_wcount) > 0
|
|
&& journal->j_trans_start_time > 0
|
|
&& (now - journal->j_trans_start_time) >
|
|
journal->j_max_trans_age) || (!join
|
|
&& atomic_read(&journal->j_jlock))
|
|
|| (!join && journal->j_cnode_free < (journal->j_trans_max * 3))) {
|
|
|
|
old_trans_id = journal->j_trans_id;
|
|
/* allow others to finish this transaction */
|
|
unlock_journal(sb);
|
|
|
|
if (!join && (journal->j_len_alloc + nblocks + 2) >=
|
|
journal->j_max_batch &&
|
|
((journal->j_len + nblocks + 2) * 100) <
|
|
(journal->j_len_alloc * 75)) {
|
|
if (atomic_read(&journal->j_wcount) > 10) {
|
|
sched_count++;
|
|
queue_log_writer(sb);
|
|
goto relock;
|
|
}
|
|
}
|
|
/*
|
|
* don't mess with joining the transaction if all we
|
|
* have to do is wait for someone else to do a commit
|
|
*/
|
|
if (atomic_read(&journal->j_jlock)) {
|
|
while (journal->j_trans_id == old_trans_id &&
|
|
atomic_read(&journal->j_jlock)) {
|
|
queue_log_writer(sb);
|
|
}
|
|
goto relock;
|
|
}
|
|
retval = journal_join(&myth, sb);
|
|
if (retval)
|
|
goto out_fail;
|
|
|
|
/* someone might have ended the transaction while we joined */
|
|
if (old_trans_id != journal->j_trans_id) {
|
|
retval = do_journal_end(&myth, 0);
|
|
} else {
|
|
retval = do_journal_end(&myth, COMMIT_NOW);
|
|
}
|
|
|
|
if (retval)
|
|
goto out_fail;
|
|
|
|
PROC_INFO_INC(sb, journal.journal_relock_wcount);
|
|
goto relock;
|
|
}
|
|
/* we are the first writer, set trans_id */
|
|
if (journal->j_trans_start_time == 0) {
|
|
journal->j_trans_start_time = get_seconds();
|
|
}
|
|
atomic_inc(&journal->j_wcount);
|
|
journal->j_len_alloc += nblocks;
|
|
th->t_blocks_logged = 0;
|
|
th->t_blocks_allocated = nblocks;
|
|
th->t_trans_id = journal->j_trans_id;
|
|
unlock_journal(sb);
|
|
INIT_LIST_HEAD(&th->t_list);
|
|
return 0;
|
|
|
|
out_fail:
|
|
memset(th, 0, sizeof(*th));
|
|
/*
|
|
* Re-set th->t_super, so we can properly keep track of how many
|
|
* persistent transactions there are. We need to do this so if this
|
|
* call is part of a failed restart_transaction, we can free it later
|
|
*/
|
|
th->t_super = sb;
|
|
return retval;
|
|
}
|
|
|
|
struct reiserfs_transaction_handle *reiserfs_persistent_transaction(struct
|
|
super_block
|
|
*s,
|
|
int nblocks)
|
|
{
|
|
int ret;
|
|
struct reiserfs_transaction_handle *th;
|
|
|
|
/*
|
|
* if we're nesting into an existing transaction. It will be
|
|
* persistent on its own
|
|
*/
|
|
if (reiserfs_transaction_running(s)) {
|
|
th = current->journal_info;
|
|
th->t_refcount++;
|
|
BUG_ON(th->t_refcount < 2);
|
|
|
|
return th;
|
|
}
|
|
th = kmalloc(sizeof(struct reiserfs_transaction_handle), GFP_NOFS);
|
|
if (!th)
|
|
return NULL;
|
|
ret = journal_begin(th, s, nblocks);
|
|
if (ret) {
|
|
kfree(th);
|
|
return NULL;
|
|
}
|
|
|
|
SB_JOURNAL(s)->j_persistent_trans++;
|
|
return th;
|
|
}
|
|
|
|
int reiserfs_end_persistent_transaction(struct reiserfs_transaction_handle *th)
|
|
{
|
|
struct super_block *s = th->t_super;
|
|
int ret = 0;
|
|
if (th->t_trans_id)
|
|
ret = journal_end(th);
|
|
else
|
|
ret = -EIO;
|
|
if (th->t_refcount == 0) {
|
|
SB_JOURNAL(s)->j_persistent_trans--;
|
|
kfree(th);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int journal_join(struct reiserfs_transaction_handle *th,
|
|
struct super_block *sb)
|
|
{
|
|
struct reiserfs_transaction_handle *cur_th = current->journal_info;
|
|
|
|
/*
|
|
* this keeps do_journal_end from NULLing out the
|
|
* current->journal_info pointer
|
|
*/
|
|
th->t_handle_save = cur_th;
|
|
BUG_ON(cur_th && cur_th->t_refcount > 1);
|
|
return do_journal_begin_r(th, sb, 1, JBEGIN_JOIN);
|
|
}
|
|
|
|
int journal_join_abort(struct reiserfs_transaction_handle *th,
|
|
struct super_block *sb)
|
|
{
|
|
struct reiserfs_transaction_handle *cur_th = current->journal_info;
|
|
|
|
/*
|
|
* this keeps do_journal_end from NULLing out the
|
|
* current->journal_info pointer
|
|
*/
|
|
th->t_handle_save = cur_th;
|
|
BUG_ON(cur_th && cur_th->t_refcount > 1);
|
|
return do_journal_begin_r(th, sb, 1, JBEGIN_ABORT);
|
|
}
|
|
|
|
int journal_begin(struct reiserfs_transaction_handle *th,
|
|
struct super_block *sb, unsigned long nblocks)
|
|
{
|
|
struct reiserfs_transaction_handle *cur_th = current->journal_info;
|
|
int ret;
|
|
|
|
th->t_handle_save = NULL;
|
|
if (cur_th) {
|
|
/* we are nesting into the current transaction */
|
|
if (cur_th->t_super == sb) {
|
|
BUG_ON(!cur_th->t_refcount);
|
|
cur_th->t_refcount++;
|
|
memcpy(th, cur_th, sizeof(*th));
|
|
if (th->t_refcount <= 1)
|
|
reiserfs_warning(sb, "reiserfs-2005",
|
|
"BAD: refcount <= 1, but "
|
|
"journal_info != 0");
|
|
return 0;
|
|
} else {
|
|
/*
|
|
* we've ended up with a handle from a different
|
|
* filesystem. save it and restore on journal_end.
|
|
* This should never really happen...
|
|
*/
|
|
reiserfs_warning(sb, "clm-2100",
|
|
"nesting info a different FS");
|
|
th->t_handle_save = current->journal_info;
|
|
current->journal_info = th;
|
|
}
|
|
} else {
|
|
current->journal_info = th;
|
|
}
|
|
ret = do_journal_begin_r(th, sb, nblocks, JBEGIN_REG);
|
|
BUG_ON(current->journal_info != th);
|
|
|
|
/*
|
|
* I guess this boils down to being the reciprocal of clm-2100 above.
|
|
* If do_journal_begin_r fails, we need to put it back, since
|
|
* journal_end won't be called to do it. */
|
|
if (ret)
|
|
current->journal_info = th->t_handle_save;
|
|
else
|
|
BUG_ON(!th->t_refcount);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* puts bh into the current transaction. If it was already there, reorders
|
|
* removes the old pointers from the hash, and puts new ones in (to make
|
|
* sure replay happen in the right order).
|
|
*
|
|
* if it was dirty, cleans and files onto the clean list. I can't let it
|
|
* be dirty again until the transaction is committed.
|
|
*
|
|
* if j_len, is bigger than j_len_alloc, it pushes j_len_alloc to 10 + j_len.
|
|
*/
|
|
int journal_mark_dirty(struct reiserfs_transaction_handle *th,
|
|
struct buffer_head *bh)
|
|
{
|
|
struct super_block *sb = th->t_super;
|
|
struct reiserfs_journal *journal = SB_JOURNAL(sb);
|
|
struct reiserfs_journal_cnode *cn = NULL;
|
|
int count_already_incd = 0;
|
|
int prepared = 0;
|
|
BUG_ON(!th->t_trans_id);
|
|
|
|
PROC_INFO_INC(sb, journal.mark_dirty);
|
|
if (th->t_trans_id != journal->j_trans_id) {
|
|
reiserfs_panic(th->t_super, "journal-1577",
|
|
"handle trans id %ld != current trans id %ld",
|
|
th->t_trans_id, journal->j_trans_id);
|
|
}
|
|
|
|
prepared = test_clear_buffer_journal_prepared(bh);
|
|
clear_buffer_journal_restore_dirty(bh);
|
|
/* already in this transaction, we are done */
|
|
if (buffer_journaled(bh)) {
|
|
PROC_INFO_INC(sb, journal.mark_dirty_already);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* this must be turned into a panic instead of a warning. We can't
|
|
* allow a dirty or journal_dirty or locked buffer to be logged, as
|
|
* some changes could get to disk too early. NOT GOOD.
|
|
*/
|
|
if (!prepared || buffer_dirty(bh)) {
|
|
reiserfs_warning(sb, "journal-1777",
|
|
"buffer %llu bad state "
|
|
"%cPREPARED %cLOCKED %cDIRTY %cJDIRTY_WAIT",
|
|
(unsigned long long)bh->b_blocknr,
|
|
prepared ? ' ' : '!',
|
|
buffer_locked(bh) ? ' ' : '!',
|
|
buffer_dirty(bh) ? ' ' : '!',
|
|
buffer_journal_dirty(bh) ? ' ' : '!');
|
|
}
|
|
|
|
if (atomic_read(&journal->j_wcount) <= 0) {
|
|
reiserfs_warning(sb, "journal-1409",
|
|
"returning because j_wcount was %d",
|
|
atomic_read(&journal->j_wcount));
|
|
return 1;
|
|
}
|
|
/*
|
|
* this error means I've screwed up, and we've overflowed
|
|
* the transaction. Nothing can be done here, except make the
|
|
* FS readonly or panic.
|
|
*/
|
|
if (journal->j_len >= journal->j_trans_max) {
|
|
reiserfs_panic(th->t_super, "journal-1413",
|
|
"j_len (%lu) is too big",
|
|
journal->j_len);
|
|
}
|
|
|
|
if (buffer_journal_dirty(bh)) {
|
|
count_already_incd = 1;
|
|
PROC_INFO_INC(sb, journal.mark_dirty_notjournal);
|
|
clear_buffer_journal_dirty(bh);
|
|
}
|
|
|
|
if (journal->j_len > journal->j_len_alloc) {
|
|
journal->j_len_alloc = journal->j_len + JOURNAL_PER_BALANCE_CNT;
|
|
}
|
|
|
|
set_buffer_journaled(bh);
|
|
|
|
/* now put this guy on the end */
|
|
if (!cn) {
|
|
cn = get_cnode(sb);
|
|
if (!cn) {
|
|
reiserfs_panic(sb, "journal-4", "get_cnode failed!");
|
|
}
|
|
|
|
if (th->t_blocks_logged == th->t_blocks_allocated) {
|
|
th->t_blocks_allocated += JOURNAL_PER_BALANCE_CNT;
|
|
journal->j_len_alloc += JOURNAL_PER_BALANCE_CNT;
|
|
}
|
|
th->t_blocks_logged++;
|
|
journal->j_len++;
|
|
|
|
cn->bh = bh;
|
|
cn->blocknr = bh->b_blocknr;
|
|
cn->sb = sb;
|
|
cn->jlist = NULL;
|
|
insert_journal_hash(journal->j_hash_table, cn);
|
|
if (!count_already_incd) {
|
|
get_bh(bh);
|
|
}
|
|
}
|
|
cn->next = NULL;
|
|
cn->prev = journal->j_last;
|
|
cn->bh = bh;
|
|
if (journal->j_last) {
|
|
journal->j_last->next = cn;
|
|
journal->j_last = cn;
|
|
} else {
|
|
journal->j_first = cn;
|
|
journal->j_last = cn;
|
|
}
|
|
reiserfs_schedule_old_flush(sb);
|
|
return 0;
|
|
}
|
|
|
|
int journal_end(struct reiserfs_transaction_handle *th)
|
|
{
|
|
struct super_block *sb = th->t_super;
|
|
if (!current->journal_info && th->t_refcount > 1)
|
|
reiserfs_warning(sb, "REISER-NESTING",
|
|
"th NULL, refcount %d", th->t_refcount);
|
|
|
|
if (!th->t_trans_id) {
|
|
WARN_ON(1);
|
|
return -EIO;
|
|
}
|
|
|
|
th->t_refcount--;
|
|
if (th->t_refcount > 0) {
|
|
struct reiserfs_transaction_handle *cur_th =
|
|
current->journal_info;
|
|
|
|
/*
|
|
* we aren't allowed to close a nested transaction on a
|
|
* different filesystem from the one in the task struct
|
|
*/
|
|
BUG_ON(cur_th->t_super != th->t_super);
|
|
|
|
if (th != cur_th) {
|
|
memcpy(current->journal_info, th, sizeof(*th));
|
|
th->t_trans_id = 0;
|
|
}
|
|
return 0;
|
|
} else {
|
|
return do_journal_end(th, 0);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* removes from the current transaction, relsing and descrementing any counters.
|
|
* also files the removed buffer directly onto the clean list
|
|
*
|
|
* called by journal_mark_freed when a block has been deleted
|
|
*
|
|
* returns 1 if it cleaned and relsed the buffer. 0 otherwise
|
|
*/
|
|
static int remove_from_transaction(struct super_block *sb,
|
|
b_blocknr_t blocknr, int already_cleaned)
|
|
{
|
|
struct buffer_head *bh;
|
|
struct reiserfs_journal_cnode *cn;
|
|
struct reiserfs_journal *journal = SB_JOURNAL(sb);
|
|
int ret = 0;
|
|
|
|
cn = get_journal_hash_dev(sb, journal->j_hash_table, blocknr);
|
|
if (!cn || !cn->bh) {
|
|
return ret;
|
|
}
|
|
bh = cn->bh;
|
|
if (cn->prev) {
|
|
cn->prev->next = cn->next;
|
|
}
|
|
if (cn->next) {
|
|
cn->next->prev = cn->prev;
|
|
}
|
|
if (cn == journal->j_first) {
|
|
journal->j_first = cn->next;
|
|
}
|
|
if (cn == journal->j_last) {
|
|
journal->j_last = cn->prev;
|
|
}
|
|
if (bh)
|
|
remove_journal_hash(sb, journal->j_hash_table, NULL,
|
|
bh->b_blocknr, 0);
|
|
clear_buffer_journaled(bh); /* don't log this one */
|
|
|
|
if (!already_cleaned) {
|
|
clear_buffer_journal_dirty(bh);
|
|
clear_buffer_dirty(bh);
|
|
clear_buffer_journal_test(bh);
|
|
put_bh(bh);
|
|
if (atomic_read(&bh->b_count) < 0) {
|
|
reiserfs_warning(sb, "journal-1752",
|
|
"b_count < 0");
|
|
}
|
|
ret = 1;
|
|
}
|
|
journal->j_len--;
|
|
journal->j_len_alloc--;
|
|
free_cnode(sb, cn);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* for any cnode in a journal list, it can only be dirtied of all the
|
|
* transactions that include it are committed to disk.
|
|
* this checks through each transaction, and returns 1 if you are allowed
|
|
* to dirty, and 0 if you aren't
|
|
*
|
|
* it is called by dirty_journal_list, which is called after
|
|
* flush_commit_list has gotten all the log blocks for a given
|
|
* transaction on disk
|
|
*
|
|
*/
|
|
static int can_dirty(struct reiserfs_journal_cnode *cn)
|
|
{
|
|
struct super_block *sb = cn->sb;
|
|
b_blocknr_t blocknr = cn->blocknr;
|
|
struct reiserfs_journal_cnode *cur = cn->hprev;
|
|
int can_dirty = 1;
|
|
|
|
/*
|
|
* first test hprev. These are all newer than cn, so any node here
|
|
* with the same block number and dev means this node can't be sent
|
|
* to disk right now.
|
|
*/
|
|
while (cur && can_dirty) {
|
|
if (cur->jlist && cur->bh && cur->blocknr && cur->sb == sb &&
|
|
cur->blocknr == blocknr) {
|
|
can_dirty = 0;
|
|
}
|
|
cur = cur->hprev;
|
|
}
|
|
/*
|
|
* then test hnext. These are all older than cn. As long as they
|
|
* are committed to the log, it is safe to write cn to disk
|
|
*/
|
|
cur = cn->hnext;
|
|
while (cur && can_dirty) {
|
|
if (cur->jlist && cur->jlist->j_len > 0 &&
|
|
atomic_read(&cur->jlist->j_commit_left) > 0 && cur->bh &&
|
|
cur->blocknr && cur->sb == sb && cur->blocknr == blocknr) {
|
|
can_dirty = 0;
|
|
}
|
|
cur = cur->hnext;
|
|
}
|
|
return can_dirty;
|
|
}
|
|
|
|
/*
|
|
* syncs the commit blocks, but does not force the real buffers to disk
|
|
* will wait until the current transaction is done/committed before returning
|
|
*/
|
|
int journal_end_sync(struct reiserfs_transaction_handle *th)
|
|
{
|
|
struct super_block *sb = th->t_super;
|
|
struct reiserfs_journal *journal = SB_JOURNAL(sb);
|
|
|
|
BUG_ON(!th->t_trans_id);
|
|
/* you can sync while nested, very, very bad */
|
|
BUG_ON(th->t_refcount > 1);
|
|
if (journal->j_len == 0) {
|
|
reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb),
|
|
1);
|
|
journal_mark_dirty(th, SB_BUFFER_WITH_SB(sb));
|
|
}
|
|
return do_journal_end(th, COMMIT_NOW | WAIT);
|
|
}
|
|
|
|
/* writeback the pending async commits to disk */
|
|
static void flush_async_commits(struct work_struct *work)
|
|
{
|
|
struct reiserfs_journal *journal =
|
|
container_of(work, struct reiserfs_journal, j_work.work);
|
|
struct super_block *sb = journal->j_work_sb;
|
|
struct reiserfs_journal_list *jl;
|
|
struct list_head *entry;
|
|
|
|
reiserfs_write_lock(sb);
|
|
if (!list_empty(&journal->j_journal_list)) {
|
|
/* last entry is the youngest, commit it and you get everything */
|
|
entry = journal->j_journal_list.prev;
|
|
jl = JOURNAL_LIST_ENTRY(entry);
|
|
flush_commit_list(sb, jl, 1);
|
|
}
|
|
reiserfs_write_unlock(sb);
|
|
}
|
|
|
|
/*
|
|
* flushes any old transactions to disk
|
|
* ends the current transaction if it is too old
|
|
*/
|
|
void reiserfs_flush_old_commits(struct super_block *sb)
|
|
{
|
|
time_t now;
|
|
struct reiserfs_transaction_handle th;
|
|
struct reiserfs_journal *journal = SB_JOURNAL(sb);
|
|
|
|
now = get_seconds();
|
|
/*
|
|
* safety check so we don't flush while we are replaying the log during
|
|
* mount
|
|
*/
|
|
if (list_empty(&journal->j_journal_list))
|
|
return;
|
|
|
|
/*
|
|
* check the current transaction. If there are no writers, and it is
|
|
* too old, finish it, and force the commit blocks to disk
|
|
*/
|
|
if (atomic_read(&journal->j_wcount) <= 0 &&
|
|
journal->j_trans_start_time > 0 &&
|
|
journal->j_len > 0 &&
|
|
(now - journal->j_trans_start_time) > journal->j_max_trans_age) {
|
|
if (!journal_join(&th, sb)) {
|
|
reiserfs_prepare_for_journal(sb,
|
|
SB_BUFFER_WITH_SB(sb),
|
|
1);
|
|
journal_mark_dirty(&th, SB_BUFFER_WITH_SB(sb));
|
|
|
|
/*
|
|
* we're only being called from kreiserfsd, it makes
|
|
* no sense to do an async commit so that kreiserfsd
|
|
* can do it later
|
|
*/
|
|
do_journal_end(&th, COMMIT_NOW | WAIT);
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* returns 0 if do_journal_end should return right away, returns 1 if
|
|
* do_journal_end should finish the commit
|
|
*
|
|
* if the current transaction is too old, but still has writers, this will
|
|
* wait on j_join_wait until all the writers are done. By the time it
|
|
* wakes up, the transaction it was called has already ended, so it just
|
|
* flushes the commit list and returns 0.
|
|
*
|
|
* Won't batch when flush or commit_now is set. Also won't batch when
|
|
* others are waiting on j_join_wait.
|
|
*
|
|
* Note, we can't allow the journal_end to proceed while there are still
|
|
* writers in the log.
|
|
*/
|
|
static int check_journal_end(struct reiserfs_transaction_handle *th, int flags)
|
|
{
|
|
|
|
time_t now;
|
|
int flush = flags & FLUSH_ALL;
|
|
int commit_now = flags & COMMIT_NOW;
|
|
int wait_on_commit = flags & WAIT;
|
|
struct reiserfs_journal_list *jl;
|
|
struct super_block *sb = th->t_super;
|
|
struct reiserfs_journal *journal = SB_JOURNAL(sb);
|
|
|
|
BUG_ON(!th->t_trans_id);
|
|
|
|
if (th->t_trans_id != journal->j_trans_id) {
|
|
reiserfs_panic(th->t_super, "journal-1577",
|
|
"handle trans id %ld != current trans id %ld",
|
|
th->t_trans_id, journal->j_trans_id);
|
|
}
|
|
|
|
journal->j_len_alloc -= (th->t_blocks_allocated - th->t_blocks_logged);
|
|
/* <= 0 is allowed. unmounting might not call begin */
|
|
if (atomic_read(&journal->j_wcount) > 0)
|
|
atomic_dec(&journal->j_wcount);
|
|
|
|
/*
|
|
* BUG, deal with case where j_len is 0, but people previously
|
|
* freed blocks need to be released will be dealt with by next
|
|
* transaction that actually writes something, but should be taken
|
|
* care of in this trans
|
|
*/
|
|
BUG_ON(journal->j_len == 0);
|
|
|
|
/*
|
|
* if wcount > 0, and we are called to with flush or commit_now,
|
|
* we wait on j_join_wait. We will wake up when the last writer has
|
|
* finished the transaction, and started it on its way to the disk.
|
|
* Then, we flush the commit or journal list, and just return 0
|
|
* because the rest of journal end was already done for this
|
|
* transaction.
|
|
*/
|
|
if (atomic_read(&journal->j_wcount) > 0) {
|
|
if (flush || commit_now) {
|
|
unsigned trans_id;
|
|
|
|
jl = journal->j_current_jl;
|
|
trans_id = jl->j_trans_id;
|
|
if (wait_on_commit)
|
|
jl->j_state |= LIST_COMMIT_PENDING;
|
|
atomic_set(&journal->j_jlock, 1);
|
|
if (flush) {
|
|
journal->j_next_full_flush = 1;
|
|
}
|
|
unlock_journal(sb);
|
|
|
|
/*
|
|
* sleep while the current transaction is
|
|
* still j_jlocked
|
|
*/
|
|
while (journal->j_trans_id == trans_id) {
|
|
if (atomic_read(&journal->j_jlock)) {
|
|
queue_log_writer(sb);
|
|
} else {
|
|
lock_journal(sb);
|
|
if (journal->j_trans_id == trans_id) {
|
|
atomic_set(&journal->j_jlock,
|
|
1);
|
|
}
|
|
unlock_journal(sb);
|
|
}
|
|
}
|
|
BUG_ON(journal->j_trans_id == trans_id);
|
|
|
|
if (commit_now
|
|
&& journal_list_still_alive(sb, trans_id)
|
|
&& wait_on_commit) {
|
|
flush_commit_list(sb, jl, 1);
|
|
}
|
|
return 0;
|
|
}
|
|
unlock_journal(sb);
|
|
return 0;
|
|
}
|
|
|
|
/* deal with old transactions where we are the last writers */
|
|
now = get_seconds();
|
|
if ((now - journal->j_trans_start_time) > journal->j_max_trans_age) {
|
|
commit_now = 1;
|
|
journal->j_next_async_flush = 1;
|
|
}
|
|
/* don't batch when someone is waiting on j_join_wait */
|
|
/* don't batch when syncing the commit or flushing the whole trans */
|
|
if (!(journal->j_must_wait > 0) && !(atomic_read(&journal->j_jlock))
|
|
&& !flush && !commit_now && (journal->j_len < journal->j_max_batch)
|
|
&& journal->j_len_alloc < journal->j_max_batch
|
|
&& journal->j_cnode_free > (journal->j_trans_max * 3)) {
|
|
journal->j_bcount++;
|
|
unlock_journal(sb);
|
|
return 0;
|
|
}
|
|
|
|
if (journal->j_start > SB_ONDISK_JOURNAL_SIZE(sb)) {
|
|
reiserfs_panic(sb, "journal-003",
|
|
"j_start (%ld) is too high",
|
|
journal->j_start);
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Does all the work that makes deleting blocks safe.
|
|
* when deleting a block mark BH_JNew, just remove it from the current
|
|
* transaction, clean it's buffer_head and move on.
|
|
*
|
|
* otherwise:
|
|
* set a bit for the block in the journal bitmap. That will prevent it from
|
|
* being allocated for unformatted nodes before this transaction has finished.
|
|
*
|
|
* mark any cnodes for this block as BLOCK_FREED, and clear their bh pointers.
|
|
* That will prevent any old transactions with this block from trying to flush
|
|
* to the real location. Since we aren't removing the cnode from the
|
|
* journal_list_hash, *the block can't be reallocated yet.
|
|
*
|
|
* Then remove it from the current transaction, decrementing any counters and
|
|
* filing it on the clean list.
|
|
*/
|
|
int journal_mark_freed(struct reiserfs_transaction_handle *th,
|
|
struct super_block *sb, b_blocknr_t blocknr)
|
|
{
|
|
struct reiserfs_journal *journal = SB_JOURNAL(sb);
|
|
struct reiserfs_journal_cnode *cn = NULL;
|
|
struct buffer_head *bh = NULL;
|
|
struct reiserfs_list_bitmap *jb = NULL;
|
|
int cleaned = 0;
|
|
BUG_ON(!th->t_trans_id);
|
|
|
|
cn = get_journal_hash_dev(sb, journal->j_hash_table, blocknr);
|
|
if (cn && cn->bh) {
|
|
bh = cn->bh;
|
|
get_bh(bh);
|
|
}
|
|
/* if it is journal new, we just remove it from this transaction */
|
|
if (bh && buffer_journal_new(bh)) {
|
|
clear_buffer_journal_new(bh);
|
|
clear_prepared_bits(bh);
|
|
reiserfs_clean_and_file_buffer(bh);
|
|
cleaned = remove_from_transaction(sb, blocknr, cleaned);
|
|
} else {
|
|
/*
|
|
* set the bit for this block in the journal bitmap
|
|
* for this transaction
|
|
*/
|
|
jb = journal->j_current_jl->j_list_bitmap;
|
|
if (!jb) {
|
|
reiserfs_panic(sb, "journal-1702",
|
|
"journal_list_bitmap is NULL");
|
|
}
|
|
set_bit_in_list_bitmap(sb, blocknr, jb);
|
|
|
|
/* Note, the entire while loop is not allowed to schedule. */
|
|
|
|
if (bh) {
|
|
clear_prepared_bits(bh);
|
|
reiserfs_clean_and_file_buffer(bh);
|
|
}
|
|
cleaned = remove_from_transaction(sb, blocknr, cleaned);
|
|
|
|
/*
|
|
* find all older transactions with this block,
|
|
* make sure they don't try to write it out
|
|
*/
|
|
cn = get_journal_hash_dev(sb, journal->j_list_hash_table,
|
|
blocknr);
|
|
while (cn) {
|
|
if (sb == cn->sb && blocknr == cn->blocknr) {
|
|
set_bit(BLOCK_FREED, &cn->state);
|
|
if (cn->bh) {
|
|
/*
|
|
* remove_from_transaction will brelse
|
|
* the buffer if it was in the current
|
|
* trans
|
|
*/
|
|
if (!cleaned) {
|
|
clear_buffer_journal_dirty(cn->
|
|
bh);
|
|
clear_buffer_dirty(cn->bh);
|
|
clear_buffer_journal_test(cn->
|
|
bh);
|
|
cleaned = 1;
|
|
put_bh(cn->bh);
|
|
if (atomic_read
|
|
(&cn->bh->b_count) < 0) {
|
|
reiserfs_warning(sb,
|
|
"journal-2138",
|
|
"cn->bh->b_count < 0");
|
|
}
|
|
}
|
|
/*
|
|
* since we are clearing the bh,
|
|
* we MUST dec nonzerolen
|
|
*/
|
|
if (cn->jlist) {
|
|
atomic_dec(&cn->jlist->
|
|
j_nonzerolen);
|
|
}
|
|
cn->bh = NULL;
|
|
}
|
|
}
|
|
cn = cn->hnext;
|
|
}
|
|
}
|
|
|
|
if (bh)
|
|
release_buffer_page(bh); /* get_hash grabs the buffer */
|
|
return 0;
|
|
}
|
|
|
|
void reiserfs_update_inode_transaction(struct inode *inode)
|
|
{
|
|
struct reiserfs_journal *journal = SB_JOURNAL(inode->i_sb);
|
|
REISERFS_I(inode)->i_jl = journal->j_current_jl;
|
|
REISERFS_I(inode)->i_trans_id = journal->j_trans_id;
|
|
}
|
|
|
|
/*
|
|
* returns -1 on error, 0 if no commits/barriers were done and 1
|
|
* if a transaction was actually committed and the barrier was done
|
|
*/
|
|
static int __commit_trans_jl(struct inode *inode, unsigned long id,
|
|
struct reiserfs_journal_list *jl)
|
|
{
|
|
struct reiserfs_transaction_handle th;
|
|
struct super_block *sb = inode->i_sb;
|
|
struct reiserfs_journal *journal = SB_JOURNAL(sb);
|
|
int ret = 0;
|
|
|
|
/*
|
|
* is it from the current transaction,
|
|
* or from an unknown transaction?
|
|
*/
|
|
if (id == journal->j_trans_id) {
|
|
jl = journal->j_current_jl;
|
|
/*
|
|
* try to let other writers come in and
|
|
* grow this transaction
|
|
*/
|
|
let_transaction_grow(sb, id);
|
|
if (journal->j_trans_id != id) {
|
|
goto flush_commit_only;
|
|
}
|
|
|
|
ret = journal_begin(&th, sb, 1);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* someone might have ended this transaction while we joined */
|
|
if (journal->j_trans_id != id) {
|
|
reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb),
|
|
1);
|
|
journal_mark_dirty(&th, SB_BUFFER_WITH_SB(sb));
|
|
ret = journal_end(&th);
|
|
goto flush_commit_only;
|
|
}
|
|
|
|
ret = journal_end_sync(&th);
|
|
if (!ret)
|
|
ret = 1;
|
|
|
|
} else {
|
|
/*
|
|
* this gets tricky, we have to make sure the journal list in
|
|
* the inode still exists. We know the list is still around
|
|
* if we've got a larger transaction id than the oldest list
|
|
*/
|
|
flush_commit_only:
|
|
if (journal_list_still_alive(inode->i_sb, id)) {
|
|
/*
|
|
* we only set ret to 1 when we know for sure
|
|
* the barrier hasn't been started yet on the commit
|
|
* block.
|
|
*/
|
|
if (atomic_read(&jl->j_commit_left) > 1)
|
|
ret = 1;
|
|
flush_commit_list(sb, jl, 1);
|
|
if (journal->j_errno)
|
|
ret = journal->j_errno;
|
|
}
|
|
}
|
|
/* otherwise the list is gone, and long since committed */
|
|
return ret;
|
|
}
|
|
|
|
int reiserfs_commit_for_inode(struct inode *inode)
|
|
{
|
|
unsigned int id = REISERFS_I(inode)->i_trans_id;
|
|
struct reiserfs_journal_list *jl = REISERFS_I(inode)->i_jl;
|
|
|
|
/*
|
|
* for the whole inode, assume unset id means it was
|
|
* changed in the current transaction. More conservative
|
|
*/
|
|
if (!id || !jl) {
|
|
reiserfs_update_inode_transaction(inode);
|
|
id = REISERFS_I(inode)->i_trans_id;
|
|
/* jl will be updated in __commit_trans_jl */
|
|
}
|
|
|
|
return __commit_trans_jl(inode, id, jl);
|
|
}
|
|
|
|
void reiserfs_restore_prepared_buffer(struct super_block *sb,
|
|
struct buffer_head *bh)
|
|
{
|
|
struct reiserfs_journal *journal = SB_JOURNAL(sb);
|
|
PROC_INFO_INC(sb, journal.restore_prepared);
|
|
if (!bh) {
|
|
return;
|
|
}
|
|
if (test_clear_buffer_journal_restore_dirty(bh) &&
|
|
buffer_journal_dirty(bh)) {
|
|
struct reiserfs_journal_cnode *cn;
|
|
reiserfs_write_lock(sb);
|
|
cn = get_journal_hash_dev(sb,
|
|
journal->j_list_hash_table,
|
|
bh->b_blocknr);
|
|
if (cn && can_dirty(cn)) {
|
|
set_buffer_journal_test(bh);
|
|
mark_buffer_dirty(bh);
|
|
}
|
|
reiserfs_write_unlock(sb);
|
|
}
|
|
clear_buffer_journal_prepared(bh);
|
|
}
|
|
|
|
extern struct tree_balance *cur_tb;
|
|
/*
|
|
* before we can change a metadata block, we have to make sure it won't
|
|
* be written to disk while we are altering it. So, we must:
|
|
* clean it
|
|
* wait on it.
|
|
*/
|
|
int reiserfs_prepare_for_journal(struct super_block *sb,
|
|
struct buffer_head *bh, int wait)
|
|
{
|
|
PROC_INFO_INC(sb, journal.prepare);
|
|
|
|
if (!trylock_buffer(bh)) {
|
|
if (!wait)
|
|
return 0;
|
|
lock_buffer(bh);
|
|
}
|
|
set_buffer_journal_prepared(bh);
|
|
if (test_clear_buffer_dirty(bh) && buffer_journal_dirty(bh)) {
|
|
clear_buffer_journal_test(bh);
|
|
set_buffer_journal_restore_dirty(bh);
|
|
}
|
|
unlock_buffer(bh);
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* long and ugly. If flush, will not return until all commit
|
|
* blocks and all real buffers in the trans are on disk.
|
|
* If no_async, won't return until all commit blocks are on disk.
|
|
*
|
|
* keep reading, there are comments as you go along
|
|
*
|
|
* If the journal is aborted, we just clean up. Things like flushing
|
|
* journal lists, etc just won't happen.
|
|
*/
|
|
static int do_journal_end(struct reiserfs_transaction_handle *th, int flags)
|
|
{
|
|
struct super_block *sb = th->t_super;
|
|
struct reiserfs_journal *journal = SB_JOURNAL(sb);
|
|
struct reiserfs_journal_cnode *cn, *next, *jl_cn;
|
|
struct reiserfs_journal_cnode *last_cn = NULL;
|
|
struct reiserfs_journal_desc *desc;
|
|
struct reiserfs_journal_commit *commit;
|
|
struct buffer_head *c_bh; /* commit bh */
|
|
struct buffer_head *d_bh; /* desc bh */
|
|
int cur_write_start = 0; /* start index of current log write */
|
|
int old_start;
|
|
int i;
|
|
int flush;
|
|
int wait_on_commit;
|
|
struct reiserfs_journal_list *jl, *temp_jl;
|
|
struct list_head *entry, *safe;
|
|
unsigned long jindex;
|
|
unsigned int commit_trans_id;
|
|
int trans_half;
|
|
int depth;
|
|
|
|
BUG_ON(th->t_refcount > 1);
|
|
BUG_ON(!th->t_trans_id);
|
|
BUG_ON(!th->t_super);
|
|
|
|
/*
|
|
* protect flush_older_commits from doing mistakes if the
|
|
* transaction ID counter gets overflowed.
|
|
*/
|
|
if (th->t_trans_id == ~0U)
|
|
flags |= FLUSH_ALL | COMMIT_NOW | WAIT;
|
|
flush = flags & FLUSH_ALL;
|
|
wait_on_commit = flags & WAIT;
|
|
|
|
current->journal_info = th->t_handle_save;
|
|
reiserfs_check_lock_depth(sb, "journal end");
|
|
if (journal->j_len == 0) {
|
|
reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb),
|
|
1);
|
|
journal_mark_dirty(th, SB_BUFFER_WITH_SB(sb));
|
|
}
|
|
|
|
lock_journal(sb);
|
|
if (journal->j_next_full_flush) {
|
|
flags |= FLUSH_ALL;
|
|
flush = 1;
|
|
}
|
|
if (journal->j_next_async_flush) {
|
|
flags |= COMMIT_NOW | WAIT;
|
|
wait_on_commit = 1;
|
|
}
|
|
|
|
/*
|
|
* check_journal_end locks the journal, and unlocks if it does
|
|
* not return 1 it tells us if we should continue with the
|
|
* journal_end, or just return
|
|
*/
|
|
if (!check_journal_end(th, flags)) {
|
|
reiserfs_schedule_old_flush(sb);
|
|
wake_queued_writers(sb);
|
|
reiserfs_async_progress_wait(sb);
|
|
goto out;
|
|
}
|
|
|
|
/* check_journal_end might set these, check again */
|
|
if (journal->j_next_full_flush) {
|
|
flush = 1;
|
|
}
|
|
|
|
/*
|
|
* j must wait means we have to flush the log blocks, and the
|
|
* real blocks for this transaction
|
|
*/
|
|
if (journal->j_must_wait > 0) {
|
|
flush = 1;
|
|
}
|
|
#ifdef REISERFS_PREALLOCATE
|
|
/*
|
|
* quota ops might need to nest, setup the journal_info pointer
|
|
* for them and raise the refcount so that it is > 0.
|
|
*/
|
|
current->journal_info = th;
|
|
th->t_refcount++;
|
|
|
|
/* it should not involve new blocks into the transaction */
|
|
reiserfs_discard_all_prealloc(th);
|
|
|
|
th->t_refcount--;
|
|
current->journal_info = th->t_handle_save;
|
|
#endif
|
|
|
|
/* setup description block */
|
|
d_bh =
|
|
journal_getblk(sb,
|
|
SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
|
|
journal->j_start);
|
|
set_buffer_uptodate(d_bh);
|
|
desc = (struct reiserfs_journal_desc *)(d_bh)->b_data;
|
|
memset(d_bh->b_data, 0, d_bh->b_size);
|
|
memcpy(get_journal_desc_magic(d_bh), JOURNAL_DESC_MAGIC, 8);
|
|
set_desc_trans_id(desc, journal->j_trans_id);
|
|
|
|
/*
|
|
* setup commit block. Don't write (keep it clean too) this one
|
|
* until after everyone else is written
|
|
*/
|
|
c_bh = journal_getblk(sb, SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
|
|
((journal->j_start + journal->j_len +
|
|
1) % SB_ONDISK_JOURNAL_SIZE(sb)));
|
|
commit = (struct reiserfs_journal_commit *)c_bh->b_data;
|
|
memset(c_bh->b_data, 0, c_bh->b_size);
|
|
set_commit_trans_id(commit, journal->j_trans_id);
|
|
set_buffer_uptodate(c_bh);
|
|
|
|
/* init this journal list */
|
|
jl = journal->j_current_jl;
|
|
|
|
/*
|
|
* we lock the commit before doing anything because
|
|
* we want to make sure nobody tries to run flush_commit_list until
|
|
* the new transaction is fully setup, and we've already flushed the
|
|
* ordered bh list
|
|
*/
|
|
reiserfs_mutex_lock_safe(&jl->j_commit_mutex, sb);
|
|
|
|
/* save the transaction id in case we need to commit it later */
|
|
commit_trans_id = jl->j_trans_id;
|
|
|
|
atomic_set(&jl->j_older_commits_done, 0);
|
|
jl->j_trans_id = journal->j_trans_id;
|
|
jl->j_timestamp = journal->j_trans_start_time;
|
|
jl->j_commit_bh = c_bh;
|
|
jl->j_start = journal->j_start;
|
|
jl->j_len = journal->j_len;
|
|
atomic_set(&jl->j_nonzerolen, journal->j_len);
|
|
atomic_set(&jl->j_commit_left, journal->j_len + 2);
|
|
jl->j_realblock = NULL;
|
|
|
|
/*
|
|
* The ENTIRE FOR LOOP MUST not cause schedule to occur.
|
|
* for each real block, add it to the journal list hash,
|
|
* copy into real block index array in the commit or desc block
|
|
*/
|
|
trans_half = journal_trans_half(sb->s_blocksize);
|
|
for (i = 0, cn = journal->j_first; cn; cn = cn->next, i++) {
|
|
if (buffer_journaled(cn->bh)) {
|
|
jl_cn = get_cnode(sb);
|
|
if (!jl_cn) {
|
|
reiserfs_panic(sb, "journal-1676",
|
|
"get_cnode returned NULL");
|
|
}
|
|
if (i == 0) {
|
|
jl->j_realblock = jl_cn;
|
|
}
|
|
jl_cn->prev = last_cn;
|
|
jl_cn->next = NULL;
|
|
if (last_cn) {
|
|
last_cn->next = jl_cn;
|
|
}
|
|
last_cn = jl_cn;
|
|
/*
|
|
* make sure the block we are trying to log
|
|
* is not a block of journal or reserved area
|
|
*/
|
|
if (is_block_in_log_or_reserved_area
|
|
(sb, cn->bh->b_blocknr)) {
|
|
reiserfs_panic(sb, "journal-2332",
|
|
"Trying to log block %lu, "
|
|
"which is a log block",
|
|
cn->bh->b_blocknr);
|
|
}
|
|
jl_cn->blocknr = cn->bh->b_blocknr;
|
|
jl_cn->state = 0;
|
|
jl_cn->sb = sb;
|
|
jl_cn->bh = cn->bh;
|
|
jl_cn->jlist = jl;
|
|
insert_journal_hash(journal->j_list_hash_table, jl_cn);
|
|
if (i < trans_half) {
|
|
desc->j_realblock[i] =
|
|
cpu_to_le32(cn->bh->b_blocknr);
|
|
} else {
|
|
commit->j_realblock[i - trans_half] =
|
|
cpu_to_le32(cn->bh->b_blocknr);
|
|
}
|
|
} else {
|
|
i--;
|
|
}
|
|
}
|
|
set_desc_trans_len(desc, journal->j_len);
|
|
set_desc_mount_id(desc, journal->j_mount_id);
|
|
set_desc_trans_id(desc, journal->j_trans_id);
|
|
set_commit_trans_len(commit, journal->j_len);
|
|
|
|
/*
|
|
* special check in case all buffers in the journal
|
|
* were marked for not logging
|
|
*/
|
|
BUG_ON(journal->j_len == 0);
|
|
|
|
/*
|
|
* we're about to dirty all the log blocks, mark the description block
|
|
* dirty now too. Don't mark the commit block dirty until all the
|
|
* others are on disk
|
|
*/
|
|
mark_buffer_dirty(d_bh);
|
|
|
|
/*
|
|
* first data block is j_start + 1, so add one to
|
|
* cur_write_start wherever you use it
|
|
*/
|
|
cur_write_start = journal->j_start;
|
|
cn = journal->j_first;
|
|
jindex = 1; /* start at one so we don't get the desc again */
|
|
while (cn) {
|
|
clear_buffer_journal_new(cn->bh);
|
|
/* copy all the real blocks into log area. dirty log blocks */
|
|
if (buffer_journaled(cn->bh)) {
|
|
struct buffer_head *tmp_bh;
|
|
char *addr;
|
|
struct page *page;
|
|
tmp_bh =
|
|
journal_getblk(sb,
|
|
SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
|
|
((cur_write_start +
|
|
jindex) %
|
|
SB_ONDISK_JOURNAL_SIZE(sb)));
|
|
set_buffer_uptodate(tmp_bh);
|
|
page = cn->bh->b_page;
|
|
addr = kmap(page);
|
|
memcpy(tmp_bh->b_data,
|
|
addr + offset_in_page(cn->bh->b_data),
|
|
cn->bh->b_size);
|
|
kunmap(page);
|
|
mark_buffer_dirty(tmp_bh);
|
|
jindex++;
|
|
set_buffer_journal_dirty(cn->bh);
|
|
clear_buffer_journaled(cn->bh);
|
|
} else {
|
|
/*
|
|
* JDirty cleared sometime during transaction.
|
|
* don't log this one
|
|
*/
|
|
reiserfs_warning(sb, "journal-2048",
|
|
"BAD, buffer in journal hash, "
|
|
"but not JDirty!");
|
|
brelse(cn->bh);
|
|
}
|
|
next = cn->next;
|
|
free_cnode(sb, cn);
|
|
cn = next;
|
|
reiserfs_cond_resched(sb);
|
|
}
|
|
|
|
/*
|
|
* we are done with both the c_bh and d_bh, but
|
|
* c_bh must be written after all other commit blocks,
|
|
* so we dirty/relse c_bh in flush_commit_list, with commit_left <= 1.
|
|
*/
|
|
|
|
journal->j_current_jl = alloc_journal_list(sb);
|
|
|
|
/* now it is safe to insert this transaction on the main list */
|
|
list_add_tail(&jl->j_list, &journal->j_journal_list);
|
|
list_add_tail(&jl->j_working_list, &journal->j_working_list);
|
|
journal->j_num_work_lists++;
|
|
|
|
/* reset journal values for the next transaction */
|
|
old_start = journal->j_start;
|
|
journal->j_start =
|
|
(journal->j_start + journal->j_len +
|
|
2) % SB_ONDISK_JOURNAL_SIZE(sb);
|
|
atomic_set(&journal->j_wcount, 0);
|
|
journal->j_bcount = 0;
|
|
journal->j_last = NULL;
|
|
journal->j_first = NULL;
|
|
journal->j_len = 0;
|
|
journal->j_trans_start_time = 0;
|
|
/* check for trans_id overflow */
|
|
if (++journal->j_trans_id == 0)
|
|
journal->j_trans_id = 10;
|
|
journal->j_current_jl->j_trans_id = journal->j_trans_id;
|
|
journal->j_must_wait = 0;
|
|
journal->j_len_alloc = 0;
|
|
journal->j_next_full_flush = 0;
|
|
journal->j_next_async_flush = 0;
|
|
init_journal_hash(sb);
|
|
|
|
/*
|
|
* make sure reiserfs_add_jh sees the new current_jl before we
|
|
* write out the tails
|
|
*/
|
|
smp_mb();
|
|
|
|
/*
|
|
* tail conversion targets have to hit the disk before we end the
|
|
* transaction. Otherwise a later transaction might repack the tail
|
|
* before this transaction commits, leaving the data block unflushed
|
|
* and clean, if we crash before the later transaction commits, the
|
|
* data block is lost.
|
|
*/
|
|
if (!list_empty(&jl->j_tail_bh_list)) {
|
|
depth = reiserfs_write_unlock_nested(sb);
|
|
write_ordered_buffers(&journal->j_dirty_buffers_lock,
|
|
journal, jl, &jl->j_tail_bh_list);
|
|
reiserfs_write_lock_nested(sb, depth);
|
|
}
|
|
BUG_ON(!list_empty(&jl->j_tail_bh_list));
|
|
mutex_unlock(&jl->j_commit_mutex);
|
|
|
|
/*
|
|
* honor the flush wishes from the caller, simple commits can
|
|
* be done outside the journal lock, they are done below
|
|
*
|
|
* if we don't flush the commit list right now, we put it into
|
|
* the work queue so the people waiting on the async progress work
|
|
* queue don't wait for this proc to flush journal lists and such.
|
|
*/
|
|
if (flush) {
|
|
flush_commit_list(sb, jl, 1);
|
|
flush_journal_list(sb, jl, 1);
|
|
} else if (!(jl->j_state & LIST_COMMIT_PENDING)) {
|
|
/*
|
|
* Avoid queueing work when sb is being shut down. Transaction
|
|
* will be flushed on journal shutdown.
|
|
*/
|
|
if (sb->s_flags & MS_ACTIVE)
|
|
queue_delayed_work(REISERFS_SB(sb)->commit_wq,
|
|
&journal->j_work, HZ / 10);
|
|
}
|
|
|
|
/*
|
|
* if the next transaction has any chance of wrapping, flush
|
|
* transactions that might get overwritten. If any journal lists
|
|
* are very old flush them as well.
|
|
*/
|
|
first_jl:
|
|
list_for_each_safe(entry, safe, &journal->j_journal_list) {
|
|
temp_jl = JOURNAL_LIST_ENTRY(entry);
|
|
if (journal->j_start <= temp_jl->j_start) {
|
|
if ((journal->j_start + journal->j_trans_max + 1) >=
|
|
temp_jl->j_start) {
|
|
flush_used_journal_lists(sb, temp_jl);
|
|
goto first_jl;
|
|
} else if ((journal->j_start +
|
|
journal->j_trans_max + 1) <
|
|
SB_ONDISK_JOURNAL_SIZE(sb)) {
|
|
/*
|
|
* if we don't cross into the next
|
|
* transaction and we don't wrap, there is
|
|
* no way we can overlap any later transactions
|
|
* break now
|
|
*/
|
|
break;
|
|
}
|
|
} else if ((journal->j_start +
|
|
journal->j_trans_max + 1) >
|
|
SB_ONDISK_JOURNAL_SIZE(sb)) {
|
|
if (((journal->j_start + journal->j_trans_max + 1) %
|
|
SB_ONDISK_JOURNAL_SIZE(sb)) >=
|
|
temp_jl->j_start) {
|
|
flush_used_journal_lists(sb, temp_jl);
|
|
goto first_jl;
|
|
} else {
|
|
/*
|
|
* we don't overlap anything from out start
|
|
* to the end of the log, and our wrapped
|
|
* portion doesn't overlap anything at
|
|
* the start of the log. We can break
|
|
*/
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
journal->j_current_jl->j_list_bitmap =
|
|
get_list_bitmap(sb, journal->j_current_jl);
|
|
|
|
if (!(journal->j_current_jl->j_list_bitmap)) {
|
|
reiserfs_panic(sb, "journal-1996",
|
|
"could not get a list bitmap");
|
|
}
|
|
|
|
atomic_set(&journal->j_jlock, 0);
|
|
unlock_journal(sb);
|
|
/* wake up any body waiting to join. */
|
|
clear_bit(J_WRITERS_QUEUED, &journal->j_state);
|
|
wake_up(&journal->j_join_wait);
|
|
|
|
if (!flush && wait_on_commit &&
|
|
journal_list_still_alive(sb, commit_trans_id)) {
|
|
flush_commit_list(sb, jl, 1);
|
|
}
|
|
out:
|
|
reiserfs_check_lock_depth(sb, "journal end2");
|
|
|
|
memset(th, 0, sizeof(*th));
|
|
/*
|
|
* Re-set th->t_super, so we can properly keep track of how many
|
|
* persistent transactions there are. We need to do this so if this
|
|
* call is part of a failed restart_transaction, we can free it later
|
|
*/
|
|
th->t_super = sb;
|
|
|
|
return journal->j_errno;
|
|
}
|
|
|
|
/* Send the file system read only and refuse new transactions */
|
|
void reiserfs_abort_journal(struct super_block *sb, int errno)
|
|
{
|
|
struct reiserfs_journal *journal = SB_JOURNAL(sb);
|
|
if (test_bit(J_ABORTED, &journal->j_state))
|
|
return;
|
|
|
|
if (!journal->j_errno)
|
|
journal->j_errno = errno;
|
|
|
|
sb->s_flags |= MS_RDONLY;
|
|
set_bit(J_ABORTED, &journal->j_state);
|
|
|
|
#ifdef CONFIG_REISERFS_CHECK
|
|
dump_stack();
|
|
#endif
|
|
}
|