Implement FAT fs mount option 'notify'. The effect of this option
is that a notification is sent to userspace on errors that indicate
filesystem damage/inconsistency. Generic filesystem corruption
notification mechnism is used.
Signed-off-by: Denis Karpov <ext-denis.2.karpov@xxxxxxxxx>
---
fs/fat/fat.h | 3 ++-
fs/fat/inode.c | 9 ++++++++-
fs/fat/misc.c | 7 +++++++
3 files changed, 17 insertions(+), 2 deletions(-)
diff --git a/fs/fat/fat.h b/fs/fat/fat.h
index a811ac0..4b7a394 100644
--- a/fs/fat/fat.h
+++ b/fs/fat/fat.h
@@ -39,7 +39,8 @@ struct fat_mount_options {
nocase:1, /* Does this need case conversion? 0=need case conversion*/
usefree:1, /* Use free_clusters for FAT32 */
tz_utc:1, /* Filesystem timestamps are in UTC */
- rodir:1; /* allow ATTR_RO for directory */
+ rodir:1, /* allow ATTR_RO for directory */
+ err_notify:1; /* Notify userspace on fs errors */
};
#define FAT_HASH_BITS 8
diff --git a/fs/fat/inode.c b/fs/fat/inode.c
index 2762145..cc299fc 100644
--- a/fs/fat/inode.c
+++ b/fs/fat/inode.c
@@ -835,6 +835,8 @@ static int fat_show_options(struct seq_file *m, struct vfsmount *mnt)
seq_puts(m, ",flush");
if (opts->tz_utc)
seq_puts(m, ",tz=UTC");
+ if (opts->err_notify)
+ seq_puts(m, ",notify");
return 0;
}
@@ -847,7 +849,7 @@ enum {
Opt_charset, Opt_shortname_lower, Opt_shortname_win95,
Opt_shortname_winnt, Opt_shortname_mixed, Opt_utf8_no, Opt_utf8_yes,
Opt_uni_xl_no, Opt_uni_xl_yes, Opt_nonumtail_no, Opt_nonumtail_yes,
- Opt_obsolate, Opt_flush, Opt_tz_utc, Opt_rodir, Opt_err,
+ Opt_obsolate, Opt_flush, Opt_tz_utc, Opt_rodir, Opt_err_notify, Opt_err,
};
static const match_table_t fat_tokens = {
@@ -883,6 +885,7 @@ static const match_table_t fat_tokens = {
{Opt_obsolate, "posix"},
{Opt_flush, "flush"},
{Opt_tz_utc, "tz=UTC"},
+ {Opt_err_notify, "notify"},
{Opt_err, NULL},
};
static const match_table_t msdos_tokens = {
@@ -952,6 +955,7 @@ static int parse_options(char *options, int is_vfat, int silent, int *debug,
opts->numtail = 1;
opts->usefree = opts->nocase = 0;
opts->tz_utc = 0;
+ opts->err_notify = 0;
*debug = 0;
if (!options)
@@ -1044,6 +1048,9 @@ static int parse_options(char *options, int is_vfat, int silent, int *debug,
case Opt_tz_utc:
opts->tz_utc = 1;
break;
+ case Opt_err_notify:
+ opts->err_notify = 1;
+ break;
/* msdos specific */
case Opt_dots:
diff --git a/fs/fat/misc.c b/fs/fat/misc.c
index dca1b97..1d6ed41 100644
--- a/fs/fat/misc.c
+++ b/fs/fat/misc.c
@@ -9,6 +9,7 @@
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/buffer_head.h>
+#include <linux/genhd.h>
#include "fat.h"
/*
@@ -20,6 +21,7 @@ void fat_fs_error(struct super_block *s, const char *function,
const char *fmt, ...)
{
va_list args;
+ struct msdos_sb_info *sbi = MSDOS_SB(s);
printk(KERN_ERR "FAT: Filesystem error (dev %s): %s:\n", s->s_id,
function);
@@ -34,6 +36,8 @@ void fat_fs_error(struct super_block *s, const char *function,
s->s_flags |= MS_RDONLY;
printk(KERN_ERR " File system has been set read-only\n");
}
+ if (sbi->options.err_notify)
+ notify_part_fs_unclean(part_to_dev(s->s_bdev->bd_part), 1);
}
EXPORT_SYMBOL_GPL(fat_fs_error);
@@ -45,6 +49,7 @@ void fat_fs_warning(struct super_block *s, const char * function,
const char *fmt, ...)
{
va_list args;
+ struct msdos_sb_info *sbi = MSDOS_SB(s);
printk(KERN_ERR "FAT: Filesystem warning (dev %s): %s:\n", s->s_id,
function);
@@ -54,6 +59,8 @@ void fat_fs_warning(struct super_block *s, const char * function,
vprintk(fmt, args);
printk("\n");
va_end(args);
+ if (sbi->options.err_notify)
+ notify_part_fs_unclean(part_to_dev(s->s_bdev->bd_part), 1);
}
EXPORT_SYMBOL_GPL(fat_fs_warning);
--
1.6.3.1
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