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FAT: add 'errors' mount option

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On severe errors FAT remounts itself in read-only mode. Allow to
specify FAT fs desired behavior through 'errors' mount option:
panic, continue or remount read-only.

`mount -t [fat|vfat] -o errors=[panic,remount-ro,continue] \
	<bdev> <mount point>`

This is analog to ext2 fs 'errors' mount option.

Signed-off-by: Denis Karpov <ext-denis.2.karpov@nokia.com>
Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
This commit is contained in:
Denis Karpov
2009-06-04 02:34:22 +09:00
committed by OGAWA Hirofumi
parent 9fa7eb283c
commit 85c7859190
10 changed files with 58 additions and 22 deletions
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fs/fat/misc.c
+14 -8
View File
@@ -12,14 +12,19 @@
#include "fat.h"
/*
* fat_fs_panic reports a severe file system problem and sets the file system
* read-only. The file system can be made writable again by remounting it.
* fat_fs_error reports a file system problem that might indicate fa data
* corruption/inconsistency. Depending on 'errors' mount option the
* panic() is called, or error message is printed FAT and nothing is done,
* or filesystem is remounted read-only (default behavior).
* In case the file system is remounted read-only, it can be made writable
* again by remounting it.
*/
void fat_fs_panic(struct super_block *s, const char *fmt, ...)
void fat_fs_error(struct super_block *s, const char *fmt, ...)
{
struct fat_mount_options *opts = &MSDOS_SB(s)->options;
va_list args;
printk(KERN_ERR "FAT: Filesystem panic (dev %s)\n", s->s_id);
printk(KERN_ERR "FAT: Filesystem error (dev %s)\n", s->s_id);
printk(KERN_ERR " ");
va_start(args, fmt);
@@ -27,13 +32,14 @@ void fat_fs_panic(struct super_block *s, const char *fmt, ...)
va_end(args);
printk("\n");
if (!(s->s_flags & MS_RDONLY)) {
if (opts->errors == FAT_ERRORS_PANIC)
panic(" FAT fs panic from previous error\n");
else if (opts->errors == FAT_ERRORS_RO && !(s->s_flags & MS_RDONLY)) {
s->s_flags |= MS_RDONLY;
printk(KERN_ERR " File system has been set read-only\n");
}
}
EXPORT_SYMBOL_GPL(fat_fs_panic);
EXPORT_SYMBOL_GPL(fat_fs_error);
/* Flushes the number of free clusters on FAT32 */
/* XXX: Need to write one per FSINFO block. Currently only writes 1 */
@@ -124,7 +130,7 @@ int fat_chain_add(struct inode *inode, int new_dclus, int nr_cluster)
mark_inode_dirty(inode);
}
if (new_fclus != (inode->i_blocks >> (sbi->cluster_bits - 9))) {
fat_fs_panic(sb, "clusters badly computed (%d != %llu)",
fat_fs_error(sb, "clusters badly computed (%d != %llu)",
new_fclus,
(llu)(inode->i_blocks >> (sbi->cluster_bits - 9)));
fat_cache_inval_inode(inode);