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qi-optimize-ext2.patch

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Little cleanup and new code that collects and defers contiguous sector reads
into one potentially more efficient larger sequential read action.

This matters for example on SD Card protocol.

Signed-off-by: Andy Green <andy@openmoko.com>
This commit is contained in:
Andy Green 2008-11-28 10:16:41 +00:00 committed by Andy Green
parent 39fc2afbf4
commit f46dc9e4ab
1 changed files with 58 additions and 15 deletions
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69
qiboot/src/fs/ext2.c
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@ -189,9 +189,6 @@ int indir2_blkno = -1;
static int ext2fs_blockgroup static int ext2fs_blockgroup
(struct ext2_data *data, int group, struct ext2_block_group *blkgrp) { (struct ext2_data *data, int group, struct ext2_block_group *blkgrp) {
#ifdef DEBUG
puts("ext2fs read blockgroup\n");
#endif
return ext2fs_devread return ext2fs_devread
((__le32_to_cpu(data->sblock.first_data_block) + ((__le32_to_cpu(data->sblock.first_data_block) +
1), LOG2_EXT2_BLOCK_SIZE(data), 1), LOG2_EXT2_BLOCK_SIZE(data),
@ -212,9 +209,6 @@ static int ext2fs_read_inode
/* It is easier to calculate if the first inode is 0. */ /* It is easier to calculate if the first inode is 0. */
ino--; ino--;
#ifdef DEBUG
puts("ext2fs read inode %d\n", ino);
#endif
status = ext2fs_blockgroup(data, status = ext2fs_blockgroup(data,
ino / ino /
__le32_to_cpu(sblock->inodes_per_group), __le32_to_cpu(sblock->inodes_per_group),
@ -375,9 +369,9 @@ static int ext2fs_read_block(ext2fs_node_t node, int fileblock) {
} }
blknr = __le32_to_cpu(indir2_block[rblock % perblock]); blknr = __le32_to_cpu(indir2_block[rblock % perblock]);
} }
/* Tripple indirect. */ /* Triple indirect. */
else { else {
puts("** ext2fs doesn't support tripple indirect blocks. **\n"); puts("** ext2fs doesn't support triple indirect blocks. **\n");
return -1; return -1;
} }
#ifdef DEBUG #ifdef DEBUG
@ -387,13 +381,19 @@ static int ext2fs_read_block(ext2fs_node_t node, int fileblock) {
} }
int ext2fs_read_file int ext2fs_read_file(ext2fs_node_t node, int pos, unsigned int len, char *buf) {
(ext2fs_node_t node, int pos, unsigned int len, char *buf) {
int i; int i;
int blockcnt; int blockcnt;
int log2blocksize = LOG2_EXT2_BLOCK_SIZE(node->data); int log2blocksize = LOG2_EXT2_BLOCK_SIZE(node->data);
int blocksize = 1 <<(log2blocksize + DISK_SECTOR_BITS); int blocksize = 1 <<(log2blocksize + DISK_SECTOR_BITS);
unsigned int filesize = __le32_to_cpu(node->inode.size); unsigned int filesize = __le32_to_cpu(node->inode.size);
int previous_block_number = -1;
int delayed_start = 0;
int delayed_extent = 0;
int delayed_skipfirst = 0;
int delayed_next = 0;
char * delayed_buf = NULL;
int status;
/* Adjust len so it we can't read past the end of the file. */ /* Adjust len so it we can't read past the end of the file. */
if (len > filesize) { if (len > filesize) {
@ -435,14 +435,57 @@ int ext2fs_read_file
if (blknr) { if (blknr) {
int status; int status;
status = ext2fs_devread(blknr, 0 /* already accounted */, skipfirst, blockend, buf); if (previous_block_number != -1) {
if (delayed_next == blknr) {
delayed_extent += blockend;
delayed_next += blockend >> SECTOR_BITS;
} else { /* spill */
status = ext2fs_devread(delayed_start,
0, delayed_skipfirst,
delayed_extent, delayed_buf);
if (status == 0) if (status == 0)
return -1; return -1;
} else previous_block_number = blknr;
memset(buf, 0, blocksize - skipfirst); delayed_start = blknr;
delayed_extent = blockend;
delayed_skipfirst = skipfirst;
delayed_buf = buf;
delayed_next = blknr + (blockend >> SECTOR_BITS);
}
} else {
previous_block_number = blknr;
delayed_start = blknr;
delayed_extent = blockend;
delayed_skipfirst = skipfirst;
delayed_buf = buf;
delayed_next = blknr + (blockend >> SECTOR_BITS);
}
} else {
if (previous_block_number != -1) {
/* spill */
status = ext2fs_devread(delayed_start,
0, delayed_skipfirst,
delayed_extent, delayed_buf);
if (status == 0)
return -1;
previous_block_number = -1;
}
memset(buf, 0, blocksize - skipfirst);
}
buf += blocksize - skipfirst; buf += blocksize - skipfirst;
} }
if (previous_block_number != -1) {
/* spill */
status = ext2fs_devread(delayed_start,
0, delayed_skipfirst,
delayed_extent, delayed_buf);
if (status == 0)
return -1;
previous_block_number = -1;
}
return(len); return(len);
} }