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authorGoldwyn Rodrigues <rgoldwyn@suse.de>2015-09-04 15:44:11 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2015-09-04 16:54:41 -0700
commit7d0fb9148ab6f52006de7cce18860227594ba872 (patch)
treea7ede7bc2c035a4a50bf39105dd8c98159ca70f5
parent513e2dae9422223072ed3887e91efebec2fc0a01 (diff)
ocfs2: add errors=continue
OCFS2 is often used in high-availaibility systems. However, ocfs2 converts the filesystem to read-only at the drop of the hat. This may not be necessary, since turning the filesystem read-only would affect other running processes as well, decreasing availability. This attempt is to add errors=continue, which would return the EIO to the calling process and terminate furhter processing so that the filesystem is not corrupted further. However, the filesystem is not converted to read-only. As a future plan, I intend to create a small utility or extend fsck.ocfs2 to fix small errors such as in the inode. The input to the utility such as the inode can come from the kernel logs so we don't have to schedule a downtime for fixing small-enough errors. The patch changes the ocfs2_error to return an error. The error returned depends on the mount option set. If none is set, the default is to turn the filesystem read-only. Perhaps errors=continue is not the best option name. Historically it is used for making an attempt to progress in the current process itself. Should we call it errors=eio? or errors=killproc? Suggestions/Comments welcome. Sources are available at: https://github.com/goldwynr/linux/tree/error-cont Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com> Signed-off-by: Mark Fasheh <mfasheh@suse.de> Cc: Joel Becker <jlbec@evilplan.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--fs/ocfs2/ocfs2.h2
-rw-r--r--fs/ocfs2/super.c63
-rw-r--r--fs/ocfs2/super.h2
3 files changed, 47 insertions, 20 deletions
diff --git a/fs/ocfs2/ocfs2.h b/fs/ocfs2/ocfs2.h
index 690ddc60189b..7a0126267847 100644
--- a/fs/ocfs2/ocfs2.h
+++ b/fs/ocfs2/ocfs2.h
@@ -286,6 +286,8 @@ enum ocfs2_mount_options
OCFS2_MOUNT_HB_GLOBAL = 1 << 14, /* Global heartbeat */
OCFS2_MOUNT_JOURNAL_ASYNC_COMMIT = 1 << 15, /* Journal Async Commit */
+ OCFS2_MOUNT_ERRORS_CONT = 1 << 16, /* Return EIO to the calling process on error */
+ OCFS2_MOUNT_ERRORS_ROFS = 1 << 17, /* Change filesystem to read-only on error */
};
#define OCFS2_OSB_SOFT_RO 0x0001
diff --git a/fs/ocfs2/super.c b/fs/ocfs2/super.c
index 4474ef2bbc96..e79058ecfb4b 100644
--- a/fs/ocfs2/super.c
+++ b/fs/ocfs2/super.c
@@ -192,6 +192,7 @@ enum {
Opt_resv_level,
Opt_dir_resv_level,
Opt_journal_async_commit,
+ Opt_err_cont,
Opt_err,
};
@@ -224,6 +225,7 @@ static const match_table_t tokens = {
{Opt_resv_level, "resv_level=%u"},
{Opt_dir_resv_level, "dir_resv_level=%u"},
{Opt_journal_async_commit, "journal_async_commit"},
+ {Opt_err_cont, "errors=continue"},
{Opt_err, NULL}
};
@@ -1330,10 +1332,19 @@ static int ocfs2_parse_options(struct super_block *sb,
mopt->mount_opt |= OCFS2_MOUNT_NOINTR;
break;
case Opt_err_panic:
+ mopt->mount_opt &= ~OCFS2_MOUNT_ERRORS_CONT;
+ mopt->mount_opt &= ~OCFS2_MOUNT_ERRORS_ROFS;
mopt->mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
break;
case Opt_err_ro:
+ mopt->mount_opt &= ~OCFS2_MOUNT_ERRORS_CONT;
mopt->mount_opt &= ~OCFS2_MOUNT_ERRORS_PANIC;
+ mopt->mount_opt |= OCFS2_MOUNT_ERRORS_ROFS;
+ break;
+ case Opt_err_cont:
+ mopt->mount_opt &= ~OCFS2_MOUNT_ERRORS_ROFS;
+ mopt->mount_opt &= ~OCFS2_MOUNT_ERRORS_PANIC;
+ mopt->mount_opt |= OCFS2_MOUNT_ERRORS_CONT;
break;
case Opt_data_ordered:
mopt->mount_opt &= ~OCFS2_MOUNT_DATA_WRITEBACK;
@@ -1530,6 +1541,8 @@ static int ocfs2_show_options(struct seq_file *s, struct dentry *root)
if (opts & OCFS2_MOUNT_ERRORS_PANIC)
seq_printf(s, ",errors=panic");
+ else if (opts & OCFS2_MOUNT_ERRORS_CONT)
+ seq_printf(s, ",errors=continue");
else
seq_printf(s, ",errors=remount-ro");
@@ -2539,31 +2552,43 @@ static void ocfs2_delete_osb(struct ocfs2_super *osb)
memset(osb, 0, sizeof(struct ocfs2_super));
}
-/* Put OCFS2 into a readonly state, or (if the user specifies it),
- * panic(). We do not support continue-on-error operation. */
-static void ocfs2_handle_error(struct super_block *sb)
+/* Depending on the mount option passed, perform one of the following:
+ * Put OCFS2 into a readonly state (default)
+ * Return EIO so that only the process errs
+ * Fix the error as if fsck.ocfs2 -y
+ * panic
+ */
+static int ocfs2_handle_error(struct super_block *sb)
{
struct ocfs2_super *osb = OCFS2_SB(sb);
-
- if (osb->s_mount_opt & OCFS2_MOUNT_ERRORS_PANIC)
- panic("OCFS2: (device %s): panic forced after error\n",
- sb->s_id);
+ int rv = 0;
ocfs2_set_osb_flag(osb, OCFS2_OSB_ERROR_FS);
+ pr_crit("On-disk corruption discovered. "
+ "Please run fsck.ocfs2 once the filesystem is unmounted.\n");
- if (sb->s_flags & MS_RDONLY &&
- (ocfs2_is_soft_readonly(osb) ||
- ocfs2_is_hard_readonly(osb)))
- return;
-
- printk(KERN_CRIT "File system is now read-only due to the potential "
- "of on-disk corruption. Please run fsck.ocfs2 once the file "
- "system is unmounted.\n");
- sb->s_flags |= MS_RDONLY;
- ocfs2_set_ro_flag(osb, 0);
+ if (osb->s_mount_opt & OCFS2_MOUNT_ERRORS_PANIC) {
+ panic("OCFS2: (device %s): panic forced after error\n",
+ sb->s_id);
+ } else if (osb->s_mount_opt & OCFS2_MOUNT_ERRORS_CONT) {
+ pr_crit("OCFS2: Returning error to the calling process.\n");
+ rv = -EIO;
+ } else { /* default option */
+ rv = -EROFS;
+ if (sb->s_flags & MS_RDONLY &&
+ (ocfs2_is_soft_readonly(osb) ||
+ ocfs2_is_hard_readonly(osb)))
+ return rv;
+
+ pr_crit("OCFS2: File system is now read-only.\n");
+ sb->s_flags |= MS_RDONLY;
+ ocfs2_set_ro_flag(osb, 0);
+ }
+
+ return rv;
}
-void __ocfs2_error(struct super_block *sb, const char *function,
+int __ocfs2_error(struct super_block *sb, const char *function,
const char *fmt, ...)
{
struct va_format vaf;
@@ -2580,7 +2605,7 @@ void __ocfs2_error(struct super_block *sb, const char *function,
va_end(args);
- ocfs2_handle_error(sb);
+ return ocfs2_handle_error(sb);
}
/* Handle critical errors. This is intentionally more drastic than
diff --git a/fs/ocfs2/super.h b/fs/ocfs2/super.h
index 74ff74cf78fe..c1c87d90542c 100644
--- a/fs/ocfs2/super.h
+++ b/fs/ocfs2/super.h
@@ -32,7 +32,7 @@ int ocfs2_publish_get_mount_state(struct ocfs2_super *osb,
int node_num);
__printf(3, 4)
-void __ocfs2_error(struct super_block *sb, const char *function,
+int __ocfs2_error(struct super_block *sb, const char *function,
const char *fmt, ...);
#define ocfs2_error(sb, fmt, args...) __ocfs2_error(sb, __PRETTY_FUNCTION__, fmt, ##args)