diff options
| author | Yongqiang Yang <xiaoqiangnk@gmail.com> | 2011-04-04 15:40:24 -0400 |
|---|---|---|
| committer | Andi Kleen <ak@linux.intel.com> | 2011-04-28 08:21:00 -0700 |
| commit | 091bfbbc8a7da176d4553bff8e7d29736599017e (patch) | |
| tree | b4d5b138f51f2b196b9207a82bd8b40e2f0f3715 /fs | |
| parent | 61de8898a1dc81b0f58f2b3bbc60917a375bc45f (diff) | |
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>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Diffstat (limited to 'fs')
| -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 3fb64b9e47c4..0595b8cf0178 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -5593,13 +5593,12 @@ 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 |