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Date: Mon, 17 May 2010 09:39:17 +0900
From: OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] fat: ratelimit corruption report
Signed-off-by: OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
---
fs/fat/cache.c | 13 +++++++------
fs/fat/fat.h | 12 ++++++++++--
fs/fat/inode.c | 2 ++
fs/fat/misc.c | 22 ++++++++++++----------
4 files changed, 31 insertions(+), 18 deletions(-)
diff -puN fs/fat/cache.c~fat-error-ratelimit fs/fat/cache.c
--- linux-2.6/fs/fat/cache.c~fat-error-ratelimit 2010-05-17 03:58:03.000000000 +0900
+++ linux-2.6-hirofumi/fs/fat/cache.c 2010-05-17 03:58:03.000000000 +0900
@@ -242,9 +242,10 @@ int fat_get_cluster(struct inode *inode,
while (*fclus < cluster) {
/* prevent the infinite loop of cluster chain */
if (*fclus > limit) {
- fat_fs_error(sb, "%s: detected the cluster chain loop"
- " (i_pos %lld)", __func__,
- MSDOS_I(inode)->i_pos);
+ fat_fs_error_ratelimit(sb,
+ "%s: detected the cluster chain loop"
+ " (i_pos %lld)", __func__,
+ MSDOS_I(inode)->i_pos);
nr = -EIO;
goto out;
}
@@ -253,9 +254,9 @@ int fat_get_cluster(struct inode *inode,
if (nr < 0)
goto out;
else if (nr == FAT_ENT_FREE) {
- fat_fs_error(sb, "%s: invalid cluster chain"
- " (i_pos %lld)", __func__,
- MSDOS_I(inode)->i_pos);
+ fat_fs_error_ratelimit(sb, "%s: invalid cluster chain"
+ " (i_pos %lld)", __func__,
+ MSDOS_I(inode)->i_pos);
nr = -EIO;
goto out;
} else if (nr == FAT_ENT_EOF) {
diff -puN fs/fat/fat.h~fat-error-ratelimit fs/fat/fat.h
--- linux-2.6/fs/fat/fat.h~fat-error-ratelimit 2010-05-17 03:58:03.000000000 +0900
+++ linux-2.6-hirofumi/fs/fat/fat.h 2010-05-17 03:58:03.000000000 +0900
@@ -6,6 +6,7 @@
#include <linux/nls.h>
#include <linux/fs.h>
#include <linux/mutex.h>
+#include <linux/ratelimit.h>
#include <linux/msdos_fs.h>
/*
@@ -82,6 +83,8 @@ struct msdos_sb_info {
struct fatent_operations *fatent_ops;
struct inode *fat_inode;
+ struct ratelimit_state ratelimit;
+
spinlock_t inode_hash_lock;
struct hlist_head inode_hashtable[FAT_HASH_SIZE];
};
@@ -322,8 +325,13 @@ extern int fat_fill_super(struct super_b
extern int fat_flush_inodes(struct super_block *sb, struct inode *i1,
struct inode *i2);
/* fat/misc.c */
-extern void fat_fs_error(struct super_block *s, const char *fmt, ...)
- __attribute__ ((format (printf, 2, 3))) __cold;
+extern void
+__fat_fs_error(struct super_block *s, int report, const char *fmt, ...)
+ __attribute__ ((format (printf, 3, 4))) __cold;
+#define fat_fs_error(s, fmt, args...) \
+ __fat_fs_error(s, 1, fmt , ## args)
+#define fat_fs_error_ratelimit(s, fmt, args...) \
+ __fat_fs_error(s, __ratelimit(&MSDOS_SB(s)->ratelimit), fmt , ## args)
extern int fat_clusters_flush(struct super_block *sb);
extern int fat_chain_add(struct inode *inode, int new_dclus, int nr_cluster);
extern void fat_time_fat2unix(struct msdos_sb_info *sbi, struct timespec *ts,
diff -puN fs/fat/inode.c~fat-error-ratelimit fs/fat/inode.c
--- linux-2.6/fs/fat/inode.c~fat-error-ratelimit 2010-05-17 03:58:03.000000000 +0900
+++ linux-2.6-hirofumi/fs/fat/inode.c 2010-05-17 03:58:03.000000000 +0900
@@ -1250,6 +1250,8 @@ int fat_fill_super(struct super_block *s
sb->s_op = &fat_sops;
sb->s_export_op = &fat_export_ops;
sbi->dir_ops = fs_dir_inode_ops;
+ ratelimit_state_init(&sbi->ratelimit, DEFAULT_RATELIMIT_INTERVAL,
+ DEFAULT_RATELIMIT_BURST);
error = parse_options(data, isvfat, silent, &debug, &sbi->options);
if (error)
diff -puN fs/fat/misc.c~fat-error-ratelimit fs/fat/misc.c
--- linux-2.6/fs/fat/misc.c~fat-error-ratelimit 2010-05-17 03:58:03.000000000 +0900
+++ linux-2.6-hirofumi/fs/fat/misc.c 2010-05-17 03:59:05.000000000 +0900
@@ -20,27 +20,29 @@
* In case the file system is remounted read-only, it can be made writable
* again by remounting it.
*/
-void fat_fs_error(struct super_block *s, const char *fmt, ...)
+void __fat_fs_error(struct super_block *s, int report, const char *fmt, ...)
{
struct fat_mount_options *opts = &MSDOS_SB(s)->options;
va_list args;
- printk(KERN_ERR "FAT: Filesystem error (dev %s)\n", s->s_id);
+ if (report) {
+ printk(KERN_ERR "FAT: Filesystem error (dev %s)\n", s->s_id);
- printk(KERN_ERR " ");
- va_start(args, fmt);
- vprintk(fmt, args);
- va_end(args);
- printk("\n");
+ printk(KERN_ERR " ");
+ va_start(args, fmt);
+ vprintk(fmt, args);
+ va_end(args);
+ printk("\n");
+ }
if (opts->errors == FAT_ERRORS_PANIC)
- panic(" FAT fs panic from previous error\n");
+ 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");
+ printk(KERN_ERR "FAT: Filesystem has been set read-only\n");
}
}
-EXPORT_SYMBOL_GPL(fat_fs_error);
+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 */
_
--
OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
--
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