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authorJan Kara <jack@suse.cz>2009-12-15 16:46:49 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2009-12-16 07:20:06 -0800
commit48bde86df0acb9f53c4fd0908d023ecae962762f (patch)
tree267f26b2f4945f8c03c12ddcbb9cd26c6e3e0ad0 /fs/ext2/file.c
parent7bf0dc9b0ca9e9b6524b1f70e0898c7f11eb10be (diff)
downloadlinaro-lsk-48bde86df0acb9f53c4fd0908d023ecae962762f.tar.gz
ext2: report metadata errors during fsync
When an IO error happens while writing metadata buffers, we should better report it and call ext2_error since the filesystem is probably no longer consistent. Sometimes such IO errors happen while flushing thread does background writeback, the buffer gets later evicted from memory, and thus the only trace of the error remains as AS_EIO bit set in blockdevice's mapping. So we check this bit in ext2_fsync and report the error although we cannot be really sure which buffer we failed to write. Signed-off-by: Jan Kara <jack@suse.cz> Cc: Chris Mason <chris.mason@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/ext2/file.c')
-rw-r--r--fs/ext2/file.c21
1 files changed, 19 insertions, 2 deletions
diff --git a/fs/ext2/file.c b/fs/ext2/file.c
index a2f3afd1a1c..586e3589d4c 100644
--- a/fs/ext2/file.c
+++ b/fs/ext2/file.c
@@ -19,6 +19,7 @@
*/
#include <linux/time.h>
+#include <linux/pagemap.h>
#include "ext2.h"
#include "xattr.h"
#include "acl.h"
@@ -38,6 +39,22 @@ static int ext2_release_file (struct inode * inode, struct file * filp)
return 0;
}
+int ext2_fsync(struct file *file, struct dentry *dentry, int datasync)
+{
+ int ret;
+ struct super_block *sb = dentry->d_inode->i_sb;
+ struct address_space *mapping = sb->s_bdev->bd_inode->i_mapping;
+
+ ret = simple_fsync(file, dentry, datasync);
+ if (ret == -EIO || test_and_clear_bit(AS_EIO, &mapping->flags)) {
+ /* We don't really know where the IO error happened... */
+ ext2_error(sb, __func__,
+ "detected IO error when writing metadata buffers");
+ ret = -EIO;
+ }
+ return ret;
+}
+
/*
* We have mostly NULL's here: the current defaults are ok for
* the ext2 filesystem.
@@ -55,7 +72,7 @@ const struct file_operations ext2_file_operations = {
.mmap = generic_file_mmap,
.open = generic_file_open,
.release = ext2_release_file,
- .fsync = simple_fsync,
+ .fsync = ext2_fsync,
.splice_read = generic_file_splice_read,
.splice_write = generic_file_splice_write,
};
@@ -72,7 +89,7 @@ const struct file_operations ext2_xip_file_operations = {
.mmap = xip_file_mmap,
.open = generic_file_open,
.release = ext2_release_file,
- .fsync = simple_fsync,
+ .fsync = ext2_fsync,
};
#endif