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| author | Joakim Tjernlund <Joakim.Tjernlund@transmode.se> | 2007-03-27 13:32:09 +0200 |
|---|---|---|
| committer | David Woodhouse <dwmw2@infradead.org> | 2007-04-17 14:07:34 -0400 |
| commit | c2aecda79cd872679b9b11f9e59d797fb4c7d677 (patch) | |
| tree | 3e4faadfeaf51cd849592029f757503008720585 /fs/jffs2/scan.c | |
| parent | 10731f83009e2556f98ffa5c7c2cbffe66dacfb3 (diff) | |
| download | op-kernel-dev-c2aecda79cd872679b9b11f9e59d797fb4c7d677.zip op-kernel-dev-c2aecda79cd872679b9b11f9e59d797fb4c7d677.tar.gz | |
[JFFS2] Speed up mount for directly-mapped NOR flash
Remove excessive scanning of empty flash after a clean
marker for users of the point/unpoint method. cfi_cmdset_0001
uses point/unpoint by default iff flash mapping is linear.
The speedup is several orders of magnitude if FS is less than
half full.
Signed-off-by: Joakim Tjernlund <Joakim.Tjernlund@transmode.se>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
Diffstat (limited to 'fs/jffs2/scan.c')
| -rw-r--r-- | fs/jffs2/scan.c | 15 |
1 files changed, 11 insertions, 4 deletions
diff --git a/fs/jffs2/scan.c b/fs/jffs2/scan.c index a5103df..7a46a43 100644 --- a/fs/jffs2/scan.c +++ b/fs/jffs2/scan.c @@ -636,16 +636,17 @@ scan_more: if (*(uint32_t *)(&buf[ofs-buf_ofs]) == 0xffffffff) { uint32_t inbuf_ofs; - uint32_t empty_start; + uint32_t empty_start, scan_end; empty_start = ofs; ofs += 4; + scan_end = min_t(uint32_t, EMPTY_SCAN_SIZE(c->sector_size)/8, buf_len); D1(printk(KERN_DEBUG "Found empty flash at 0x%08x\n", ofs)); more_empty: inbuf_ofs = ofs - buf_ofs; - while (inbuf_ofs < buf_len) { - if (*(uint32_t *)(&buf[inbuf_ofs]) != 0xffffffff) { + while (inbuf_ofs < scan_end) { + if (unlikely(*(uint32_t *)(&buf[inbuf_ofs]) != 0xffffffff)) { printk(KERN_WARNING "Empty flash at 0x%08x ends at 0x%08x\n", empty_start, ofs); if ((err = jffs2_scan_dirty_space(c, jeb, ofs-empty_start))) @@ -666,7 +667,11 @@ scan_more: D1(printk(KERN_DEBUG "%d bytes at start of block seems clean... assuming all clean\n", EMPTY_SCAN_SIZE(c->sector_size))); return BLK_STATE_CLEANMARKER; } - + if (!buf_size && (scan_end != buf_len)) {/* XIP/point case */ + scan_end = buf_len; + goto more_empty; + } + /* See how much more there is to read in this eraseblock... */ buf_len = min_t(uint32_t, buf_size, jeb->offset + c->sector_size - ofs); if (!buf_len) { @@ -676,6 +681,8 @@ scan_more: empty_start)); break; } + /* point never reaches here */ + scan_end = buf_len; D1(printk(KERN_DEBUG "Reading another 0x%x at 0x%08x\n", buf_len, ofs)); err = jffs2_fill_scan_buf(c, buf, ofs, buf_len); if (err) |
