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Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4 

* 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4:
  ext4: Add new ext4 inode tracepoints
  ext4: Don't call sb_issue_discard() in ext4_free_blocks()
  ext4: do not try to grab the s_umount semaphore in ext4_quota_off
  ext4: fix potential race when freeing ext4_io_page structures
  ext4: handle writeback of inodes which are being freed
  ext4: initialize the percpu counters before replaying the journal
  ext4: "ret" may be used uninitialized in ext4_lazyinit_thread()
  ext4: fix lazyinit hang after removing request
This commit is contained in:
Linus Torvalds 2010-11-08 11:54:53 -08:00
parent 5398a64c63 7ff9c073dd
commit a7bcf21e60
6 changed files with 214 additions and 91 deletions
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4
fs/ext4/ext4.h
View File

@ -177,7 +177,7 @@ struct mpage_da_data {
struct ext4_io_page {
struct page *p_page;
int p_count;
atomic_t p_count;
};
#define MAX_IO_PAGES 128
@ -858,6 +858,7 @@ struct ext4_inode_info {
spinlock_t i_completed_io_lock;
/* current io_end structure for async DIO write*/
ext4_io_end_t *cur_aio_dio;
atomic_t i_ioend_count; /* Number of outstanding io_end structs */
/*
* Transactions that contain inode's metadata needed to complete
@ -2060,6 +2061,7 @@ extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
/* page-io.c */
extern int __init ext4_init_pageio(void);
extern void ext4_exit_pageio(void);
extern void ext4_ioend_wait(struct inode *);
extern void ext4_free_io_end(ext4_io_end_t *io);
extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
extern int ext4_end_io_nolock(ext4_io_end_t *io);

3
fs/ext4/inode.c
View File

@ -53,6 +53,7 @@
static inline int ext4_begin_ordered_truncate(struct inode *inode,
loff_t new_size)
{
trace_ext4_begin_ordered_truncate(inode, new_size);
return jbd2_journal_begin_ordered_truncate(
EXT4_SB(inode->i_sb)->s_journal,
&EXT4_I(inode)->jinode,
@ -178,6 +179,7 @@ void ext4_evict_inode(struct inode *inode)
handle_t *handle;
int err;
trace_ext4_evict_inode(inode);
if (inode->i_nlink) {
truncate_inode_pages(&inode->i_data, 0);
goto no_delete;
@ -5647,6 +5649,7 @@ int ext4_mark_inode_dirty(handle_t *handle, struct inode *inode)
int err, ret;
might_sleep();
trace_ext4_mark_inode_dirty(inode, _RET_IP_);
err = ext4_reserve_inode_write(handle, inode, &iloc);
if (ext4_handle_valid(handle) &&
EXT4_I(inode)->i_extra_isize < sbi->s_want_extra_isize &&

2
fs/ext4/mballoc.c
View File

@ -4640,8 +4640,6 @@ void ext4_free_blocks(handle_t *handle, struct inode *inode,
* with group lock held. generate_buddy look at
* them with group lock_held
*/
if (test_opt(sb, DISCARD))
ext4_issue_discard(sb, block_group, bit, count);
ext4_lock_group(sb, block_group);
mb_clear_bits(bitmap_bh->b_data, bit, count);
mb_free_blocks(inode, &e4b, bit, count);

97
fs/ext4/page-io.c
View File

@ -32,8 +32,14 @@
static struct kmem_cache *io_page_cachep, *io_end_cachep;
#define WQ_HASH_SZ 37
#define to_ioend_wq(v) (&ioend_wq[((unsigned long)v) % WQ_HASH_SZ])
static wait_queue_head_t ioend_wq[WQ_HASH_SZ];
int __init ext4_init_pageio(void)
{
int i;
io_page_cachep = KMEM_CACHE(ext4_io_page, SLAB_RECLAIM_ACCOUNT);
if (io_page_cachep == NULL)
return -ENOMEM;
@ -42,6 +48,8 @@ int __init ext4_init_pageio(void)
kmem_cache_destroy(io_page_cachep);
return -ENOMEM;
}
for (i = 0; i < WQ_HASH_SZ; i++)
init_waitqueue_head(&ioend_wq[i]);
return 0;
}
@ -52,24 +60,37 @@ void ext4_exit_pageio(void)
kmem_cache_destroy(io_page_cachep);
}
void ext4_ioend_wait(struct inode *inode)
{
wait_queue_head_t *wq = to_ioend_wq(inode);
wait_event(*wq, (atomic_read(&EXT4_I(inode)->i_ioend_count) == 0));
}
static void put_io_page(struct ext4_io_page *io_page)
{
if (atomic_dec_and_test(&io_page->p_count)) {
end_page_writeback(io_page->p_page);
put_page(io_page->p_page);
kmem_cache_free(io_page_cachep, io_page);
}
}
void ext4_free_io_end(ext4_io_end_t *io)
{
int i;
wait_queue_head_t *wq;
BUG_ON(!io);
if (io->page)
put_page(io->page);
for (i = 0; i < io->num_io_pages; i++) {
if (--io->pages[i]->p_count == 0) {
struct page *page = io->pages[i]->p_page;
end_page_writeback(page);
put_page(page);
kmem_cache_free(io_page_cachep, io->pages[i]);
}
}
for (i = 0; i < io->num_io_pages; i++)
put_io_page(io->pages[i]);
io->num_io_pages = 0;
iput(io->inode);
wq = to_ioend_wq(io->inode);
if (atomic_dec_and_test(&EXT4_I(io->inode)->i_ioend_count) &&
waitqueue_active(wq))
wake_up_all(wq);
kmem_cache_free(io_end_cachep, io);
}
@ -142,8 +163,8 @@ ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags)
io = kmem_cache_alloc(io_end_cachep, flags);
if (io) {
memset(io, 0, sizeof(*io));
io->inode = igrab(inode);
BUG_ON(!io->inode);
atomic_inc(&EXT4_I(inode)->i_ioend_count);
io->inode = inode;
INIT_WORK(&io->work, ext4_end_io_work);
INIT_LIST_HEAD(&io->list);
}
@ -171,35 +192,15 @@ static void ext4_end_bio(struct bio *bio, int error)
struct workqueue_struct *wq;
struct inode *inode;
unsigned long flags;
ext4_fsblk_t err_block;
int i;
BUG_ON(!io_end);
inode = io_end->inode;
bio->bi_private = NULL;
bio->bi_end_io = NULL;
if (test_bit(BIO_UPTODATE, &bio->bi_flags))
error = 0;
err_block = bio->bi_sector >> (inode->i_blkbits - 9);
bio_put(bio);
if (!(inode->i_sb->s_flags & MS_ACTIVE)) {
pr_err("sb umounted, discard end_io request for inode %lu\n",
io_end->inode->i_ino);
ext4_free_io_end(io_end);
return;
}
if (error) {
io_end->flag |= EXT4_IO_END_ERROR;
ext4_warning(inode->i_sb, "I/O error writing to inode %lu "
"(offset %llu size %ld starting block %llu)",
inode->i_ino,
(unsigned long long) io_end->offset,
(long) io_end->size,
(unsigned long long) err_block);
}
for (i = 0; i < io_end->num_io_pages; i++) {
struct page *page = io_end->pages[i]->p_page;
struct buffer_head *bh, *head;
@ -236,13 +237,7 @@ static void ext4_end_bio(struct bio *bio, int error)
} while (bh != head);
}
if (--io_end->pages[i]->p_count == 0) {
struct page *page = io_end->pages[i]->p_page;
end_page_writeback(page);
put_page(page);
kmem_cache_free(io_page_cachep, io_end->pages[i]);
}
put_io_page(io_end->pages[i]);
/*
* If this is a partial write which happened to make
@ -254,8 +249,19 @@ static void ext4_end_bio(struct bio *bio, int error)
if (!partial_write)
SetPageUptodate(page);
}
io_end->num_io_pages = 0;
inode = io_end->inode;
if (error) {
io_end->flag |= EXT4_IO_END_ERROR;
ext4_warning(inode->i_sb, "I/O error writing to inode %lu "
"(offset %llu size %ld starting block %llu)",
inode->i_ino,
(unsigned long long) io_end->offset,
(long) io_end->size,
(unsigned long long)
bio->bi_sector >> (inode->i_blkbits - 9));
}
/* Add the io_end to per-inode completed io list*/
spin_lock_irqsave(&EXT4_I(inode)->i_completed_io_lock, flags);
@ -305,7 +311,6 @@ static int io_submit_init(struct ext4_io_submit *io,
bio->bi_private = io->io_end = io_end;
bio->bi_end_io = ext4_end_bio;
io_end->inode = inode;
io_end->offset = (page->index << PAGE_CACHE_SHIFT) + bh_offset(bh);
io->io_bio = bio;
@ -360,7 +365,7 @@ static int io_submit_add_bh(struct ext4_io_submit *io,
if ((io_end->num_io_pages == 0) ||
(io_end->pages[io_end->num_io_pages-1] != io_page)) {
io_end->pages[io_end->num_io_pages++] = io_page;
io_page->p_count++;
atomic_inc(&io_page->p_count);
}
return 0;
}
@ -389,7 +394,7 @@ int ext4_bio_write_page(struct ext4_io_submit *io,
return -ENOMEM;
}
io_page->p_page = page;
io_page->p_count = 0;
atomic_set(&io_page->p_count, 1);
get_page(page);
for (bh = head = page_buffers(page), block_start = 0;
@ -421,10 +426,6 @@ int ext4_bio_write_page(struct ext4_io_submit *io,
* PageWriteback bit from the page to prevent the system from
* wedging later on.
*/
if (io_page->p_count == 0) {
put_page(page);
end_page_writeback(page);
kmem_cache_free(io_page_cachep, io_page);
}
put_io_page(io_page);
return ret;
}

102
fs/ext4/super.c
View File

@ -828,12 +828,22 @@ static struct inode *ext4_alloc_inode(struct super_block *sb)
ei->cur_aio_dio = NULL;
ei->i_sync_tid = 0;
ei->i_datasync_tid = 0;
atomic_set(&ei->i_ioend_count, 0);
return &ei->vfs_inode;
}
static int ext4_drop_inode(struct inode *inode)
{
int drop = generic_drop_inode(inode);
trace_ext4_drop_inode(inode, drop);
return drop;
}
static void ext4_destroy_inode(struct inode *inode)
{
ext4_ioend_wait(inode);
if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
ext4_msg(inode->i_sb, KERN_ERR,
"Inode %lu (%p): orphan list check failed!",
@ -1173,6 +1183,7 @@ static const struct super_operations ext4_sops = {
.destroy_inode = ext4_destroy_inode,
.write_inode = ext4_write_inode,
.dirty_inode = ext4_dirty_inode,
.drop_inode = ext4_drop_inode,
.evict_inode = ext4_evict_inode,
.put_super = ext4_put_super,
.sync_fs = ext4_sync_fs,
@ -1194,6 +1205,7 @@ static const struct super_operations ext4_nojournal_sops = {
.destroy_inode = ext4_destroy_inode,
.write_inode = ext4_write_inode,
.dirty_inode = ext4_dirty_inode,
.drop_inode = ext4_drop_inode,
.evict_inode = ext4_evict_inode,
.write_super = ext4_write_super,
.put_super = ext4_put_super,
@ -2699,7 +2711,6 @@ static int ext4_lazyinit_thread(void *arg)
struct ext4_li_request *elr;
unsigned long next_wakeup;
DEFINE_WAIT(wait);
int ret;
BUG_ON(NULL == eli);
@ -2723,13 +2734,12 @@ static int ext4_lazyinit_thread(void *arg)
elr = list_entry(pos, struct ext4_li_request,
lr_request);
if (time_after_eq(jiffies, elr->lr_next_sched))
ret = ext4_run_li_request(elr);
if (ret) {
ret = 0;
ext4_remove_li_request(elr);
continue;
if (time_after_eq(jiffies, elr->lr_next_sched)) {
if (ext4_run_li_request(elr) != 0) {
/* error, remove the lazy_init job */
ext4_remove_li_request(elr);
continue;
}
}
if (time_before(elr->lr_next_sched, next_wakeup))
@ -2740,7 +2750,8 @@ static int ext4_lazyinit_thread(void *arg)
if (freezing(current))
refrigerator();
if (time_after_eq(jiffies, next_wakeup)) {
if ((time_after_eq(jiffies, next_wakeup)) ||
(MAX_JIFFY_OFFSET == next_wakeup)) {
cond_resched();
continue;
}
@ -3348,6 +3359,24 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
get_random_bytes(&sbi->s_next_generation, sizeof(u32));
spin_lock_init(&sbi->s_next_gen_lock);
err = percpu_counter_init(&sbi->s_freeblocks_counter,
ext4_count_free_blocks(sb));
if (!err) {
err = percpu_counter_init(&sbi->s_freeinodes_counter,
ext4_count_free_inodes(sb));
}
if (!err) {
err = percpu_counter_init(&sbi->s_dirs_counter,
ext4_count_dirs(sb));
}
if (!err) {
err = percpu_counter_init(&sbi->s_dirtyblocks_counter, 0);
}
if (err) {
ext4_msg(sb, KERN_ERR, "insufficient memory");
goto failed_mount3;
}
sbi->s_stripe = ext4_get_stripe_size(sbi);
sbi->s_max_writeback_mb_bump = 128;
@ -3446,22 +3475,19 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
}
set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
no_journal:
err = percpu_counter_init(&sbi->s_freeblocks_counter,
ext4_count_free_blocks(sb));
if (!err)
err = percpu_counter_init(&sbi->s_freeinodes_counter,
ext4_count_free_inodes(sb));
if (!err)
err = percpu_counter_init(&sbi->s_dirs_counter,
ext4_count_dirs(sb));
if (!err)
err = percpu_counter_init(&sbi->s_dirtyblocks_counter, 0);
if (err) {
ext4_msg(sb, KERN_ERR, "insufficient memory");
goto failed_mount_wq;
}
/*
* The journal may have updated the bg summary counts, so we
* need to update the global counters.
*/
percpu_counter_set(&sbi->s_freeblocks_counter,
ext4_count_free_blocks(sb));
percpu_counter_set(&sbi->s_freeinodes_counter,
ext4_count_free_inodes(sb));
percpu_counter_set(&sbi->s_dirs_counter,
ext4_count_dirs(sb));
percpu_counter_set(&sbi->s_dirtyblocks_counter, 0);
no_journal:
EXT4_SB(sb)->dio_unwritten_wq = create_workqueue("ext4-dio-unwritten");
if (!EXT4_SB(sb)->dio_unwritten_wq) {
printk(KERN_ERR "EXT4-fs: failed to create DIO workqueue\n");
@ -3611,10 +3637,6 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
jbd2_journal_destroy(sbi->s_journal);
sbi->s_journal = NULL;
}
percpu_counter_destroy(&sbi->s_freeblocks_counter);
percpu_counter_destroy(&sbi->s_freeinodes_counter);
percpu_counter_destroy(&sbi->s_dirs_counter);
percpu_counter_destroy(&sbi->s_dirtyblocks_counter);
failed_mount3:
if (sbi->s_flex_groups) {
if (is_vmalloc_addr(sbi->s_flex_groups))
@ -3622,6 +3644,10 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
else
kfree(sbi->s_flex_groups);
}
percpu_counter_destroy(&sbi->s_freeblocks_counter);
percpu_counter_destroy(&sbi->s_freeinodes_counter);
percpu_counter_destroy(&sbi->s_dirs_counter);
percpu_counter_destroy(&sbi->s_dirtyblocks_counter);
failed_mount2:
for (i = 0; i < db_count; i++)
brelse(sbi->s_group_desc[i]);
@ -3949,13 +3975,11 @@ static int ext4_commit_super(struct super_block *sb, int sync)
else
es->s_kbytes_written =
cpu_to_le64(EXT4_SB(sb)->s_kbytes_written);
if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeblocks_counter))
ext4_free_blocks_count_set(es, percpu_counter_sum_positive(
&EXT4_SB(sb)->s_freeblocks_counter));
if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeinodes_counter))
es->s_free_inodes_count =
cpu_to_le32(percpu_counter_sum_positive(
&EXT4_SB(sb)->s_freeinodes_counter));
ext4_free_blocks_count_set(es, percpu_counter_sum_positive(
&EXT4_SB(sb)->s_freeblocks_counter));
es->s_free_inodes_count =
cpu_to_le32(percpu_counter_sum_positive(
&EXT4_SB(sb)->s_freeinodes_counter));
sb->s_dirt = 0;
BUFFER_TRACE(sbh, "marking dirty");
mark_buffer_dirty(sbh);
@ -4556,12 +4580,10 @@ static int ext4_quota_on(struct super_block *sb, int type, int format_id,
static int ext4_quota_off(struct super_block *sb, int type)
{
/* Force all delayed allocation blocks to be allocated */
if (test_opt(sb, DELALLOC)) {
down_read(&sb->s_umount);
/* Force all delayed allocation blocks to be allocated.
* Caller already holds s_umount sem */
if (test_opt(sb, DELALLOC))
sync_filesystem(sb);
up_read(&sb->s_umount);
}
return dquot_quota_off(sb, type);
}

97
include/trace/events/ext4.h
View File

@ -98,6 +98,103 @@ TRACE_EVENT(ext4_allocate_inode,
(unsigned long) __entry->dir, __entry->mode)
);
TRACE_EVENT(ext4_evict_inode,
TP_PROTO(struct inode *inode),
TP_ARGS(inode),
TP_STRUCT__entry(
__field( int, dev_major )
__field( int, dev_minor )
__field( ino_t, ino )
__field( int, nlink )
),
TP_fast_assign(
__entry->dev_major = MAJOR(inode->i_sb->s_dev);
__entry->dev_minor = MINOR(inode->i_sb->s_dev);
__entry->ino = inode->i_ino;
__entry->nlink = inode->i_nlink;
),
TP_printk("dev %d,%d ino %lu nlink %d",
__entry->dev_major, __entry->dev_minor,
(unsigned long) __entry->ino, __entry->nlink)
);
TRACE_EVENT(ext4_drop_inode,
TP_PROTO(struct inode *inode, int drop),
TP_ARGS(inode, drop),
TP_STRUCT__entry(
__field( int, dev_major )
__field( int, dev_minor )
__field( ino_t, ino )
__field( int, drop )
),
TP_fast_assign(
__entry->dev_major = MAJOR(inode->i_sb->s_dev);
__entry->dev_minor = MINOR(inode->i_sb->s_dev);
__entry->ino = inode->i_ino;
__entry->drop = drop;
),
TP_printk("dev %d,%d ino %lu drop %d",
__entry->dev_major, __entry->dev_minor,
(unsigned long) __entry->ino, __entry->drop)
);
TRACE_EVENT(ext4_mark_inode_dirty,
TP_PROTO(struct inode *inode, unsigned long IP),
TP_ARGS(inode, IP),
TP_STRUCT__entry(
__field( int, dev_major )
__field( int, dev_minor )
__field( ino_t, ino )
__field(unsigned long, ip )
),
TP_fast_assign(
__entry->dev_major = MAJOR(inode->i_sb->s_dev);
__entry->dev_minor = MINOR(inode->i_sb->s_dev);
__entry->ino = inode->i_ino;
__entry->ip = IP;
),
TP_printk("dev %d,%d ino %lu caller %pF",
__entry->dev_major, __entry->dev_minor,
(unsigned long) __entry->ino, (void *)__entry->ip)
);
TRACE_EVENT(ext4_begin_ordered_truncate,
TP_PROTO(struct inode *inode, loff_t new_size),
TP_ARGS(inode, new_size),
TP_STRUCT__entry(
__field( int, dev_major )
__field( int, dev_minor )
__field( ino_t, ino )
__field( loff_t, new_size )
),
TP_fast_assign(
__entry->dev_major = MAJOR(inode->i_sb->s_dev);
__entry->dev_minor = MINOR(inode->i_sb->s_dev);
__entry->ino = inode->i_ino;
__entry->new_size = new_size;
),
TP_printk("dev %d,%d ino %lu new_size %lld",
__entry->dev_major, __entry->dev_minor,
(unsigned long) __entry->ino,
(long long) __entry->new_size)
);
DECLARE_EVENT_CLASS(ext4__write_begin,
TP_PROTO(struct inode *inode, loff_t pos, unsigned int len,