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JFFS2: Optimize building lists during scan

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If the flash is slow, reading less from the flash into buffers makes
the process faster.

Signed-off-by: Mark Tomlinson <mark.tomlinson@alliedtelesis.co.nz>
This commit is contained in:
Mark Tomlinson 2015-07-01 16:38:26 +12:00 committed by Tom Rini
parent 2d6d93a2dd
commit c5b1940f57
1 changed files with 21 additions and 4 deletions
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25
fs/jffs2/jffs2_1pass.c
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@ -1501,7 +1501,7 @@ jffs2_1pass_build_lists(struct part_info * part)
u32 counterF = 0;
u32 counterN = 0;
u32 max_totlen = 0;
u32 buf_size = DEFAULT_EMPTY_SCAN_SIZE;
u32 buf_size;
char *buf;
nr_sectors = lldiv(part->size, part->sector_size);
@ -1513,7 +1513,7 @@ jffs2_1pass_build_lists(struct part_info * part)
/* if we are building a list we need to refresh the cache. */
jffs_init_1pass_list(part);
pL = (struct b_lists *)part->jffs2_priv;
buf = malloc(buf_size);
buf = malloc(DEFAULT_EMPTY_SCAN_SIZE);
puts ("Scanning JFFS2 FS: ");
/* start at the beginning of the partition */
@ -1529,6 +1529,8 @@ jffs2_1pass_build_lists(struct part_info * part)
int ret;
#endif
/* Set buf_size to maximum length */
buf_size = DEFAULT_EMPTY_SCAN_SIZE;
WATCHDOG_RESET();
#ifdef CONFIG_JFFS2_SUMMARY
@ -1603,6 +1605,11 @@ jffs2_1pass_build_lists(struct part_info * part)
ofs += sector_ofs;
prevofs = ofs - 1;
/*
* Set buf_size down to the minimum size required.
* This prevents reading in chunks of flash data unnecessarily.
*/
buf_size = sizeof(union jffs2_node_union);
scan_more:
while (ofs < sector_ofs + part->sector_size) {
@ -1683,13 +1690,18 @@ jffs2_1pass_build_lists(struct part_info * part)
case JFFS2_NODETYPE_INODE:
if (buf_ofs + buf_len < ofs + sizeof(struct
jffs2_raw_inode)) {
buf_len = min_t(uint32_t,
sizeof(struct jffs2_raw_inode),
sector_ofs +
part->sector_size -
ofs);
get_fl_mem((u32)part->offset + ofs,
buf_len, buf);
buf_ofs = ofs;
node = (void *)buf;
}
if (!inode_crc((struct jffs2_raw_inode *) node))
break;
if (!inode_crc((struct jffs2_raw_inode *)node))
break;
if (insert_node(&pL->frag, (u32) part->offset +
ofs) == NULL) {
@ -1706,6 +1718,11 @@ jffs2_1pass_build_lists(struct part_info * part)
((struct
jffs2_raw_dirent *)
node)->nsize) {
buf_len = min_t(uint32_t,
node->totlen,
sector_ofs +
part->sector_size -
ofs);
get_fl_mem((u32)part->offset + ofs,
buf_len, buf);
buf_ofs = ofs;