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ext2fs: Fix optimization bug for doubly-indirect block pointers 

Doubly-indirect block numbers are compared against the first-level
indirect block when checking for a cached copy.  This is causing the
doubly-indirect block to be re-read each time it is accessed.
Repairing this reduces load time for a 70M file from 72 seconds
to 38 seconds.

Signed-off-by: Aaron Pace <Aaron.Pace@alcatel-lucent.com>
This commit is contained in:
Aaron Pace 2010-07-26 14:24:44 -06:00 committed by Wolfgang Denk
parent c519facc64
commit a2740dd00d
1 changed files with 1 additions and 1 deletions
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2
fs/ext2/ext2fs.c
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@ -364,7 +364,7 @@ static int ext2fs_read_block (ext2fs_node_t node, int fileblock) {
indir2_size = blksz; indir2_size = blksz;
} }
if ((__le32_to_cpu (indir1_block[rblock / perblock]) << if ((__le32_to_cpu (indir1_block[rblock / perblock]) <<
log2_blksz) != indir1_blkno) { log2_blksz) != indir2_blkno) {
status = ext2fs_devread (__le32_to_cpu(indir1_block[rblock / perblock]) << log2_blksz, status = ext2fs_devread (__le32_to_cpu(indir1_block[rblock / perblock]) << log2_blksz,
0, blksz, 0, blksz,
(char *) indir2_block); (char *) indir2_block);