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authorHidehiro Kawai <hidehiro.kawai.ez@hitachi.com>2008-10-10 22:12:43 -0400
committerTheodore Ts'o <tytso@mit.edu>2008-10-10 22:12:43 -0400
commit5bf5683a33f3584da6eced480967c4f7e11515a8 (patch)
tree4986ba3932d9f259fa1bc674deff3e35f689b243 /Documentation
parent7ad7445f60fe4d46c4c9d2a9463db180d2a3b270 (diff)
ext4: add an option to control error handling on file data
If the journal doesn't abort when it gets an IO error in file data blocks, the file data corruption will spread silently. Because most of applications and commands do buffered writes without fsync(), they don't notice the IO error. It's scary for mission critical systems. On the other hand, if the journal aborts whenever it gets an IO error in file data blocks, the system will easily become inoperable. So this patch introduces a filesystem option to determine whether it aborts the journal or just call printk() when it gets an IO error in file data. If you mount an ext4 fs with data_err=abort option, it aborts on file data write error. If you mount it with data_err=ignore, it doesn't abort, just call printk(). data_err=ignore is the default. Here is the corresponding patch of the ext3 version: http://kerneltrap.org/mailarchive/linux-kernel/2008/9/9/3239374 Signed-off-by: Hidehiro Kawai <hidehiro.kawai.ez@hitachi.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/filesystems/ext4.txt5
1 files changed, 5 insertions, 0 deletions
diff --git a/Documentation/filesystems/ext4.txt b/Documentation/filesystems/ext4.txt
index 74484e69640..eb154ef36c2 100644
--- a/Documentation/filesystems/ext4.txt
+++ b/Documentation/filesystems/ext4.txt
@@ -223,6 +223,11 @@ errors=remount-ro(*) Remount the filesystem read-only on an error.
errors=continue Keep going on a filesystem error.
errors=panic Panic and halt the machine if an error occurs.
+data_err=ignore(*) Just print an error message if an error occurs
+ in a file data buffer in ordered mode.
+data_err=abort Abort the journal if an error occurs in a file
+ data buffer in ordered mode.
+
grpid Give objects the same group ID as their creator.
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