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| author | Yongqiang Yang <xiaoqiangnk@gmail.com> | 2011-04-04 15:40:24 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-04-14 16:53:12 -0700 |
| commit | a1c2e79db1bd2aff99c3ea1beca82b9809cc30c1 (patch) | |
| tree | 34dd2647bd592ed7b39275520ab7ff70ecc73b7b | |
| parent | a12a5668aac5294b00efe15790abbd47587ef61d (diff) | |
| download | lwn-a1c2e79db1bd2aff99c3ea1beca82b9809cc30c1.tar.gz lwn-a1c2e79db1bd2aff99c3ea1beca82b9809cc30c1.zip | |
ext4: fix credits computing for indirect mapped files
commit 5b41395fcc0265fc9f193aef9df39ce49d64677c upstream.
When writing a contiguous set of blocks, two indirect blocks could be
needed depending on how the blocks are aligned, so we need to increase
the number of credits needed by one.
[ Also fixed a another bug which could further underestimate the
number of journal credits needed by 1; the code was using integer
division instead of DIV_ROUND_UP() -- tytso]
Signed-off-by: Yongqiang Yang <xiaoqiangnk@gmail.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | fs/ext4/inode.c | 11 |
1 files changed, 5 insertions, 6 deletions
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index 2059c34ac4c8..14060a0c3c9f 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -5374,13 +5374,12 @@ static int ext4_indirect_trans_blocks(struct inode *inode, int nrblocks, /* if nrblocks are contiguous */ if (chunk) { /* - * With N contiguous data blocks, it need at most - * N/EXT4_ADDR_PER_BLOCK(inode->i_sb) indirect blocks - * 2 dindirect blocks - * 1 tindirect block + * With N contiguous data blocks, we need at most + * N/EXT4_ADDR_PER_BLOCK(inode->i_sb) + 1 indirect blocks, + * 2 dindirect blocks, and 1 tindirect block */ - indirects = nrblocks / EXT4_ADDR_PER_BLOCK(inode->i_sb); - return indirects + 3; + return DIV_ROUND_UP(nrblocks, + EXT4_ADDR_PER_BLOCK(inode->i_sb)) + 4; } /* * if nrblocks are not contiguous, worse case, each block touch |