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ext4: Fix hueristic which avoids group preallocation for closed files

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(cherry picked from commit 71780577306fd1e76c7a92e3b308db624d03adb9)

The hueristic was designed to avoid using locality group preallocation
when writing the last segment of a closed file.  Fix it by move
setting size to the maximum of size and isize until after we check
whether size == isize.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Theodore Ts'o
2009-09-28 00:06:20 -04:00
committed by Greg Kroah-Hartman
parent a6c92a88b5
commit 0be3bd025b
1 changed files with 1 additions and 1 deletions
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2
fs/ext4/mballoc.c
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@@ -4162,7 +4162,6 @@ static void ext4_mb_group_or_file(struct ext4_allocation_context *ac)
size = ac->ac_o_ex.fe_logical + ac->ac_o_ex.fe_len;
isize = (i_size_read(ac->ac_inode) + ac->ac_sb->s_blocksize - 1)
>> bsbits;
size = max(size, isize);
if ((size == isize) &&
!ext4_fs_is_busy(sbi) &&
@@ -4172,6 +4171,7 @@ static void ext4_mb_group_or_file(struct ext4_allocation_context *ac)
}
/* don't use group allocation for large files */
size = max(size, isize);
if (size >= sbi->s_mb_stream_request) {
ac->ac_flags |= EXT4_MB_STREAM_ALLOC;
return;