Implement EXT2 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/ext2/super.c | 15 ++++++++++++++-
include/linux/ext2_fs.h | 2 +-
2 files changed, 15 insertions(+), 2 deletions(-)
diff --git a/fs/ext2/super.c b/fs/ext2/super.c
index 5c4afe6..04802cd 100644
--- a/fs/ext2/super.c
+++ b/fs/ext2/super.c
@@ -32,6 +32,7 @@
#include <linux/mount.h>
#include <linux/log2.h>
#include <linux/quotaops.h>
+#include <linux/genhd.h>
#include <asm/uaccess.h>
#include "ext2.h"
#include "xattr.h"
@@ -68,6 +69,8 @@ void ext2_error (struct super_block * sb, const char * function,
printk("Remounting filesystem read-only\n");
sb->s_flags |= MS_RDONLY;
}
+ if (test_opt(sb, ERR_NOTIFY))
+ notify_part_fs_unclean(part_to_dev(sb->s_bdev->bd_part), 1);
}
void ext2_warning (struct super_block * sb, const char * function,
@@ -81,6 +84,8 @@ void ext2_warning (struct super_block * sb, const char * function,
vprintk(fmt, args);
printk("\n");
va_end(args);
+ if (test_opt(sb, ERR_NOTIFY))
+ notify_part_fs_unclean(part_to_dev(sb->s_bdev->bd_part), 1);
}
void ext2_update_dynamic_rev(struct super_block *sb)
@@ -289,6 +294,9 @@ static int ext2_show_options(struct seq_file *seq, struct vfsmount *vfs)
if (!test_opt(sb, RESERVATION))
seq_puts(seq, ",noreservation");
+ if (!test_opt(sb, ERR_NOTIFY))
+ seq_puts(seq, ",notify");
+
return 0;
}
@@ -391,7 +399,8 @@ enum {
Opt_err_ro, Opt_nouid32, Opt_nocheck, Opt_debug,
Opt_oldalloc, Opt_orlov, Opt_nobh, Opt_user_xattr, Opt_nouser_xattr,
Opt_acl, Opt_noacl, Opt_xip, Opt_ignore, Opt_err, Opt_quota,
- Opt_usrquota, Opt_grpquota, Opt_reservation, Opt_noreservation
+ Opt_usrquota, Opt_grpquota, Opt_reservation, Opt_noreservation,
+ Opt_err_notify,
};
static const match_table_t tokens = {
@@ -425,6 +434,7 @@ static const match_table_t tokens = {
{Opt_usrquota, "usrquota"},
{Opt_reservation, "reservation"},
{Opt_noreservation, "noreservation"},
+ {Opt_err_notify, "notify"},
{Opt_err, NULL}
};
@@ -565,6 +575,9 @@ static int parse_options (char * options,
clear_opt(sbi->s_mount_opt, RESERVATION);
printk("reservations OFF\n");
break;
+ case Opt_err_notify:
+ set_opt(sbi->s_mount_opt, ERR_NOTIFY);
+ break;
case Opt_ignore:
break;
default:
diff --git a/include/linux/ext2_fs.h b/include/linux/ext2_fs.h
index 121720d..ecec20b 100644
--- a/include/linux/ext2_fs.h
+++ b/include/linux/ext2_fs.h
@@ -347,7 +347,7 @@ struct ext2_inode {
#define EXT2_MOUNT_USRQUOTA 0x020000 /* user quota */
#define EXT2_MOUNT_GRPQUOTA 0x040000 /* group quota */
#define EXT2_MOUNT_RESERVATION 0x080000 /* Preallocation */
-
+#define EXT2_MOUNT_ERR_NOTIFY 0x100000 /* Error notifications */
#define clear_opt(o, opt) o &= ~EXT2_MOUNT_##opt
#define set_opt(o, opt) o |= EXT2_MOUNT_##opt
--
1.6.3.1
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