616 lines
14 KiB
C
616 lines
14 KiB
C
/*
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* linux/fs/affs/inode.c
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*
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* (c) 1996 Hans-Joachim Widmaier - Rewritten
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*
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* (C) 1993 Ray Burr - Modified for Amiga FFS filesystem.
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*
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* (C) 1992 Eric Youngdale Modified for ISO 9660 filesystem.
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*
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* (C) 1991 Linus Torvalds - minix filesystem
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/statfs.h>
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#include <linux/parser.h>
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#include <linux/magic.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include "affs.h"
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extern struct timezone sys_tz;
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static int affs_statfs(struct dentry *dentry, struct kstatfs *buf);
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static int affs_remount (struct super_block *sb, int *flags, char *data);
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static void
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affs_commit_super(struct super_block *sb, int wait, int clean)
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{
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struct affs_sb_info *sbi = AFFS_SB(sb);
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struct buffer_head *bh = sbi->s_root_bh;
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struct affs_root_tail *tail = AFFS_ROOT_TAIL(sb, bh);
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tail->bm_flag = cpu_to_be32(clean);
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secs_to_datestamp(get_seconds(), &tail->disk_change);
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affs_fix_checksum(sb, bh);
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mark_buffer_dirty(bh);
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if (wait)
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sync_dirty_buffer(bh);
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}
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static void
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affs_put_super(struct super_block *sb)
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{
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struct affs_sb_info *sbi = AFFS_SB(sb);
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pr_debug("AFFS: put_super()\n");
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if (!(sb->s_flags & MS_RDONLY) && sb->s_dirt)
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affs_commit_super(sb, 1, 1);
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kfree(sbi->s_prefix);
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affs_free_bitmap(sb);
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affs_brelse(sbi->s_root_bh);
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kfree(sbi);
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sb->s_fs_info = NULL;
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}
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static void
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affs_write_super(struct super_block *sb)
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{
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lock_super(sb);
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if (!(sb->s_flags & MS_RDONLY))
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affs_commit_super(sb, 1, 2);
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sb->s_dirt = 0;
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unlock_super(sb);
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pr_debug("AFFS: write_super() at %lu, clean=2\n", get_seconds());
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}
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static int
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affs_sync_fs(struct super_block *sb, int wait)
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{
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lock_super(sb);
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affs_commit_super(sb, wait, 2);
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sb->s_dirt = 0;
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unlock_super(sb);
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return 0;
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}
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static struct kmem_cache * affs_inode_cachep;
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static struct inode *affs_alloc_inode(struct super_block *sb)
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{
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struct affs_inode_info *i;
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i = kmem_cache_alloc(affs_inode_cachep, GFP_KERNEL);
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if (!i)
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return NULL;
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i->vfs_inode.i_version = 1;
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i->i_lc = NULL;
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i->i_ext_bh = NULL;
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i->i_pa_cnt = 0;
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return &i->vfs_inode;
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}
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static void affs_destroy_inode(struct inode *inode)
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{
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kmem_cache_free(affs_inode_cachep, AFFS_I(inode));
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}
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static void init_once(void *foo)
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{
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struct affs_inode_info *ei = (struct affs_inode_info *) foo;
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sema_init(&ei->i_link_lock, 1);
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sema_init(&ei->i_ext_lock, 1);
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inode_init_once(&ei->vfs_inode);
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}
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static int init_inodecache(void)
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{
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affs_inode_cachep = kmem_cache_create("affs_inode_cache",
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sizeof(struct affs_inode_info),
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0, (SLAB_RECLAIM_ACCOUNT|
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SLAB_MEM_SPREAD),
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init_once);
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if (affs_inode_cachep == NULL)
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return -ENOMEM;
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return 0;
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}
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static void destroy_inodecache(void)
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{
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kmem_cache_destroy(affs_inode_cachep);
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}
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static const struct super_operations affs_sops = {
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.alloc_inode = affs_alloc_inode,
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.destroy_inode = affs_destroy_inode,
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.write_inode = affs_write_inode,
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.evict_inode = affs_evict_inode,
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.put_super = affs_put_super,
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.write_super = affs_write_super,
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.sync_fs = affs_sync_fs,
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.statfs = affs_statfs,
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.remount_fs = affs_remount,
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.show_options = generic_show_options,
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};
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enum {
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Opt_bs, Opt_mode, Opt_mufs, Opt_prefix, Opt_protect,
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Opt_reserved, Opt_root, Opt_setgid, Opt_setuid,
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Opt_verbose, Opt_volume, Opt_ignore, Opt_err,
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};
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static const match_table_t tokens = {
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{Opt_bs, "bs=%u"},
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{Opt_mode, "mode=%o"},
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{Opt_mufs, "mufs"},
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{Opt_prefix, "prefix=%s"},
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{Opt_protect, "protect"},
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{Opt_reserved, "reserved=%u"},
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{Opt_root, "root=%u"},
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{Opt_setgid, "setgid=%u"},
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{Opt_setuid, "setuid=%u"},
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{Opt_verbose, "verbose"},
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{Opt_volume, "volume=%s"},
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{Opt_ignore, "grpquota"},
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{Opt_ignore, "noquota"},
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{Opt_ignore, "quota"},
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{Opt_ignore, "usrquota"},
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{Opt_err, NULL},
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};
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static int
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parse_options(char *options, uid_t *uid, gid_t *gid, int *mode, int *reserved, s32 *root,
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int *blocksize, char **prefix, char *volume, unsigned long *mount_opts)
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{
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char *p;
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substring_t args[MAX_OPT_ARGS];
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/* Fill in defaults */
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*uid = current_uid();
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*gid = current_gid();
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*reserved = 2;
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*root = -1;
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*blocksize = -1;
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volume[0] = ':';
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volume[1] = 0;
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*mount_opts = 0;
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if (!options)
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return 1;
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while ((p = strsep(&options, ",")) != NULL) {
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int token, n, option;
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if (!*p)
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continue;
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token = match_token(p, tokens, args);
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switch (token) {
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case Opt_bs:
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if (match_int(&args[0], &n))
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return 0;
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if (n != 512 && n != 1024 && n != 2048
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&& n != 4096) {
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printk ("AFFS: Invalid blocksize (512, 1024, 2048, 4096 allowed)\n");
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return 0;
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}
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*blocksize = n;
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break;
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case Opt_mode:
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if (match_octal(&args[0], &option))
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return 0;
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*mode = option & 0777;
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*mount_opts |= SF_SETMODE;
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break;
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case Opt_mufs:
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*mount_opts |= SF_MUFS;
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break;
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case Opt_prefix:
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*prefix = match_strdup(&args[0]);
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if (!*prefix)
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return 0;
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*mount_opts |= SF_PREFIX;
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break;
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case Opt_protect:
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*mount_opts |= SF_IMMUTABLE;
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break;
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case Opt_reserved:
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if (match_int(&args[0], reserved))
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return 0;
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break;
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case Opt_root:
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if (match_int(&args[0], root))
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return 0;
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break;
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case Opt_setgid:
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if (match_int(&args[0], &option))
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return 0;
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*gid = option;
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*mount_opts |= SF_SETGID;
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break;
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case Opt_setuid:
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if (match_int(&args[0], &option))
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return 0;
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*uid = option;
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*mount_opts |= SF_SETUID;
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break;
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case Opt_verbose:
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*mount_opts |= SF_VERBOSE;
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break;
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case Opt_volume: {
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char *vol = match_strdup(&args[0]);
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if (!vol)
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return 0;
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strlcpy(volume, vol, 32);
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kfree(vol);
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break;
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}
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case Opt_ignore:
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/* Silently ignore the quota options */
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break;
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default:
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printk("AFFS: Unrecognized mount option \"%s\" "
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"or missing value\n", p);
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return 0;
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}
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}
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return 1;
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}
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/* This function definitely needs to be split up. Some fine day I'll
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* hopefully have the guts to do so. Until then: sorry for the mess.
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*/
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static int affs_fill_super(struct super_block *sb, void *data, int silent)
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{
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struct affs_sb_info *sbi;
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struct buffer_head *root_bh = NULL;
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struct buffer_head *boot_bh;
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struct inode *root_inode = NULL;
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s32 root_block;
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int size, blocksize;
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u32 chksum;
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int num_bm;
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int i, j;
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s32 key;
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uid_t uid;
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gid_t gid;
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int reserved;
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unsigned long mount_flags;
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int tmp_flags; /* fix remount prototype... */
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u8 sig[4];
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int ret = -EINVAL;
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save_mount_options(sb, data);
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pr_debug("AFFS: read_super(%s)\n",data ? (const char *)data : "no options");
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sb->s_magic = AFFS_SUPER_MAGIC;
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sb->s_op = &affs_sops;
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sb->s_flags |= MS_NODIRATIME;
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sbi = kzalloc(sizeof(struct affs_sb_info), GFP_KERNEL);
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if (!sbi)
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return -ENOMEM;
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sb->s_fs_info = sbi;
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mutex_init(&sbi->s_bmlock);
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spin_lock_init(&sbi->symlink_lock);
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if (!parse_options(data,&uid,&gid,&i,&reserved,&root_block,
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&blocksize,&sbi->s_prefix,
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sbi->s_volume, &mount_flags)) {
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printk(KERN_ERR "AFFS: Error parsing options\n");
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kfree(sbi->s_prefix);
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kfree(sbi);
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return -EINVAL;
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}
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/* N.B. after this point s_prefix must be released */
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sbi->s_flags = mount_flags;
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sbi->s_mode = i;
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sbi->s_uid = uid;
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sbi->s_gid = gid;
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sbi->s_reserved= reserved;
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/* Get the size of the device in 512-byte blocks.
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* If we later see that the partition uses bigger
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* blocks, we will have to change it.
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*/
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size = sb->s_bdev->bd_inode->i_size >> 9;
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pr_debug("AFFS: initial blocksize=%d, #blocks=%d\n", 512, size);
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affs_set_blocksize(sb, PAGE_SIZE);
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/* Try to find root block. Its location depends on the block size. */
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i = 512;
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j = 4096;
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if (blocksize > 0) {
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i = j = blocksize;
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size = size / (blocksize / 512);
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}
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for (blocksize = i, key = 0; blocksize <= j; blocksize <<= 1, size >>= 1) {
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sbi->s_root_block = root_block;
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if (root_block < 0)
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sbi->s_root_block = (reserved + size - 1) / 2;
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pr_debug("AFFS: setting blocksize to %d\n", blocksize);
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affs_set_blocksize(sb, blocksize);
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sbi->s_partition_size = size;
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/* The root block location that was calculated above is not
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* correct if the partition size is an odd number of 512-
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* byte blocks, which will be rounded down to a number of
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* 1024-byte blocks, and if there were an even number of
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* reserved blocks. Ideally, all partition checkers should
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* report the real number of blocks of the real blocksize,
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* but since this just cannot be done, we have to try to
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* find the root block anyways. In the above case, it is one
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* block behind the calculated one. So we check this one, too.
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*/
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for (num_bm = 0; num_bm < 2; num_bm++) {
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pr_debug("AFFS: Dev %s, trying root=%u, bs=%d, "
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"size=%d, reserved=%d\n",
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sb->s_id,
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sbi->s_root_block + num_bm,
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blocksize, size, reserved);
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root_bh = affs_bread(sb, sbi->s_root_block + num_bm);
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if (!root_bh)
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continue;
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if (!affs_checksum_block(sb, root_bh) &&
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be32_to_cpu(AFFS_ROOT_HEAD(root_bh)->ptype) == T_SHORT &&
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be32_to_cpu(AFFS_ROOT_TAIL(sb, root_bh)->stype) == ST_ROOT) {
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sbi->s_hashsize = blocksize / 4 - 56;
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sbi->s_root_block += num_bm;
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key = 1;
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goto got_root;
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}
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affs_brelse(root_bh);
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root_bh = NULL;
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}
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}
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if (!silent)
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printk(KERN_ERR "AFFS: No valid root block on device %s\n",
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sb->s_id);
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goto out_error;
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/* N.B. after this point bh must be released */
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got_root:
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root_block = sbi->s_root_block;
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/* Find out which kind of FS we have */
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boot_bh = sb_bread(sb, 0);
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if (!boot_bh) {
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printk(KERN_ERR "AFFS: Cannot read boot block\n");
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goto out_error;
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}
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memcpy(sig, boot_bh->b_data, 4);
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brelse(boot_bh);
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chksum = be32_to_cpu(*(__be32 *)sig);
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/* Dircache filesystems are compatible with non-dircache ones
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* when reading. As long as they aren't supported, writing is
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* not recommended.
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*/
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if ((chksum == FS_DCFFS || chksum == MUFS_DCFFS || chksum == FS_DCOFS
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|| chksum == MUFS_DCOFS) && !(sb->s_flags & MS_RDONLY)) {
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printk(KERN_NOTICE "AFFS: Dircache FS - mounting %s read only\n",
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sb->s_id);
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sb->s_flags |= MS_RDONLY;
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}
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switch (chksum) {
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case MUFS_FS:
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case MUFS_INTLFFS:
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case MUFS_DCFFS:
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sbi->s_flags |= SF_MUFS;
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/* fall thru */
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case FS_INTLFFS:
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case FS_DCFFS:
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sbi->s_flags |= SF_INTL;
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break;
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case MUFS_FFS:
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sbi->s_flags |= SF_MUFS;
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break;
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case FS_FFS:
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break;
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case MUFS_OFS:
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sbi->s_flags |= SF_MUFS;
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/* fall thru */
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case FS_OFS:
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sbi->s_flags |= SF_OFS;
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sb->s_flags |= MS_NOEXEC;
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break;
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case MUFS_DCOFS:
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case MUFS_INTLOFS:
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sbi->s_flags |= SF_MUFS;
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case FS_DCOFS:
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case FS_INTLOFS:
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sbi->s_flags |= SF_INTL | SF_OFS;
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sb->s_flags |= MS_NOEXEC;
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break;
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default:
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printk(KERN_ERR "AFFS: Unknown filesystem on device %s: %08X\n",
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sb->s_id, chksum);
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goto out_error;
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}
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if (mount_flags & SF_VERBOSE) {
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u8 len = AFFS_ROOT_TAIL(sb, root_bh)->disk_name[0];
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printk(KERN_NOTICE "AFFS: Mounting volume \"%.*s\": Type=%.3s\\%c, Blocksize=%d\n",
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len > 31 ? 31 : len,
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AFFS_ROOT_TAIL(sb, root_bh)->disk_name + 1,
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sig, sig[3] + '0', blocksize);
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}
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sb->s_flags |= MS_NODEV | MS_NOSUID;
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sbi->s_data_blksize = sb->s_blocksize;
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if (sbi->s_flags & SF_OFS)
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sbi->s_data_blksize -= 24;
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/* Keep super block in cache */
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sbi->s_root_bh = root_bh;
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/* N.B. after this point s_root_bh must be released */
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tmp_flags = sb->s_flags;
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if (affs_init_bitmap(sb, &tmp_flags))
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goto out_error;
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sb->s_flags = tmp_flags;
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/* set up enough so that it can read an inode */
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root_inode = affs_iget(sb, root_block);
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if (IS_ERR(root_inode)) {
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ret = PTR_ERR(root_inode);
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goto out_error_noinode;
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}
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sb->s_root = d_alloc_root(root_inode);
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if (!sb->s_root) {
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printk(KERN_ERR "AFFS: Get root inode failed\n");
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goto out_error;
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}
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sb->s_root->d_op = &affs_dentry_operations;
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pr_debug("AFFS: s_flags=%lX\n",sb->s_flags);
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return 0;
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/*
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* Begin the cascaded cleanup ...
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*/
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out_error:
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if (root_inode)
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iput(root_inode);
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out_error_noinode:
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kfree(sbi->s_bitmap);
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affs_brelse(root_bh);
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kfree(sbi->s_prefix);
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kfree(sbi);
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sb->s_fs_info = NULL;
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return ret;
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}
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static int
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affs_remount(struct super_block *sb, int *flags, char *data)
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{
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struct affs_sb_info *sbi = AFFS_SB(sb);
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int blocksize;
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uid_t uid;
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gid_t gid;
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int mode;
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int reserved;
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int root_block;
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unsigned long mount_flags;
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int res = 0;
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char *new_opts = kstrdup(data, GFP_KERNEL);
|
|
char volume[32];
|
|
char *prefix = NULL;
|
|
|
|
pr_debug("AFFS: remount(flags=0x%x,opts=\"%s\")\n",*flags,data);
|
|
|
|
*flags |= MS_NODIRATIME;
|
|
|
|
memcpy(volume, sbi->s_volume, 32);
|
|
if (!parse_options(data, &uid, &gid, &mode, &reserved, &root_block,
|
|
&blocksize, &prefix, volume,
|
|
&mount_flags)) {
|
|
kfree(prefix);
|
|
kfree(new_opts);
|
|
return -EINVAL;
|
|
}
|
|
|
|
replace_mount_options(sb, new_opts);
|
|
|
|
sbi->s_flags = mount_flags;
|
|
sbi->s_mode = mode;
|
|
sbi->s_uid = uid;
|
|
sbi->s_gid = gid;
|
|
/* protect against readers */
|
|
spin_lock(&sbi->symlink_lock);
|
|
if (prefix) {
|
|
kfree(sbi->s_prefix);
|
|
sbi->s_prefix = prefix;
|
|
}
|
|
memcpy(sbi->s_volume, volume, 32);
|
|
spin_unlock(&sbi->symlink_lock);
|
|
|
|
if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
|
|
return 0;
|
|
|
|
if (*flags & MS_RDONLY) {
|
|
affs_write_super(sb);
|
|
affs_free_bitmap(sb);
|
|
} else
|
|
res = affs_init_bitmap(sb, flags);
|
|
|
|
return res;
|
|
}
|
|
|
|
static int
|
|
affs_statfs(struct dentry *dentry, struct kstatfs *buf)
|
|
{
|
|
struct super_block *sb = dentry->d_sb;
|
|
int free;
|
|
u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
|
|
|
|
pr_debug("AFFS: statfs() partsize=%d, reserved=%d\n",AFFS_SB(sb)->s_partition_size,
|
|
AFFS_SB(sb)->s_reserved);
|
|
|
|
free = affs_count_free_blocks(sb);
|
|
buf->f_type = AFFS_SUPER_MAGIC;
|
|
buf->f_bsize = sb->s_blocksize;
|
|
buf->f_blocks = AFFS_SB(sb)->s_partition_size - AFFS_SB(sb)->s_reserved;
|
|
buf->f_bfree = free;
|
|
buf->f_bavail = free;
|
|
buf->f_fsid.val[0] = (u32)id;
|
|
buf->f_fsid.val[1] = (u32)(id >> 32);
|
|
buf->f_namelen = 30;
|
|
return 0;
|
|
}
|
|
|
|
static struct dentry *affs_mount(struct file_system_type *fs_type,
|
|
int flags, const char *dev_name, void *data)
|
|
{
|
|
return mount_bdev(fs_type, flags, dev_name, data, affs_fill_super);
|
|
}
|
|
|
|
static struct file_system_type affs_fs_type = {
|
|
.owner = THIS_MODULE,
|
|
.name = "affs",
|
|
.mount = affs_mount,
|
|
.kill_sb = kill_block_super,
|
|
.fs_flags = FS_REQUIRES_DEV,
|
|
};
|
|
|
|
static int __init init_affs_fs(void)
|
|
{
|
|
int err = init_inodecache();
|
|
if (err)
|
|
goto out1;
|
|
err = register_filesystem(&affs_fs_type);
|
|
if (err)
|
|
goto out;
|
|
return 0;
|
|
out:
|
|
destroy_inodecache();
|
|
out1:
|
|
return err;
|
|
}
|
|
|
|
static void __exit exit_affs_fs(void)
|
|
{
|
|
unregister_filesystem(&affs_fs_type);
|
|
destroy_inodecache();
|
|
}
|
|
|
|
MODULE_DESCRIPTION("Amiga filesystem support for Linux");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
module_init(init_affs_fs)
|
|
module_exit(exit_affs_fs)
|