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authorTheodore Ts'o <tytso@mit.edu>2011-08-13 12:58:21 -0400
committerGreg Kroah-Hartman <gregkh@suse.de>2011-08-29 13:29:11 -0700
commit45df4b8977852ea12d6ed19f6c87e6765f6c31e5 (patch)
tree50111bd57a1849b89b0b0578c31788077bda6452 /fs/ext4
parent4eddd2a50f2548c6c83081fde8fdbc3de07626f6 (diff)
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ext4: fix nomblk_io_submit option so it correctly converts uninit blocks
commit 9dd75f1f1a02d656a11a7b9b9e6c2759b9c1e946 upstream. Bug discovered by Jan Kara: Finally, commit 1449032be17abb69116dbc393f67ceb8bd034f92 returned back the old IO submission code but apparently it forgot to return the old handling of uninitialized buffers so we unconditionnaly call block_write_full_page() without specifying end_io function. So AFAICS we never convert unwritten extents to written in some cases. For example when I mount the fs as: mount -t ext4 -o nomblk_io_submit,dioread_nolock /dev/ubdb /mnt and do int fd = open(argv[1], O_RDWR | O_CREAT | O_TRUNC, 0600); char buf[1024]; memset(buf, 'a', sizeof(buf)); fallocate(fd, 0, 0, 16384); write(fd, buf, sizeof(buf)); I get a file full of zeros (after remounting the filesystem so that pagecache is dropped) instead of seeing the first KB contain 'a's. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'fs/ext4')
-rw-r--r--fs/ext4/inode.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 5390b4d..b864839 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -2156,7 +2156,12 @@ static int mpage_da_submit_io(struct mpage_da_data *mpd,
else if (test_opt(inode->i_sb, MBLK_IO_SUBMIT))
err = ext4_bio_write_page(&io_submit, page,
len, mpd->wbc);
- else
+ else if (buffer_uninit(page_bufs)) {
+ ext4_set_bh_endio(page_bufs, inode);
+ err = block_write_full_page_endio(page,
+ noalloc_get_block_write,
+ mpd->wbc, ext4_end_io_buffer_write);
+ } else
err = block_write_full_page(page,
noalloc_get_block_write, mpd->wbc);