qi-hardware/xburst-tools
1
0
Fork 0
mirror of git://projects.qi-hardware.com/xburst-tools.git synced 2024-11-25 20:20:39 +02:00
Code

qi-optimize-ext2.patch

Browse Source 
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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

73
qiboot/src/fs/ext2.c
View File

@ -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 (status == 0) if (delayed_next == blknr) {
return -1; delayed_extent += blockend;
} else delayed_next += blockend >> SECTOR_BITS;
memset(buf, 0, blocksize - skipfirst); } else { /* spill */
status = ext2fs_devread(delayed_start,
0, delayed_skipfirst,
delayed_extent, delayed_buf);
if (status == 0)
return -1;
previous_block_number = blknr;
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);
} }