diff options
| author | Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> | 2009-01-06 05:49:55 +0300 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2009-01-06 05:49:55 +0300 |
| commit | 2ccb5fb9f113dae969d1ae9b6c10e80fa34f8cd3 (patch) | |
| tree | d9dc5bca94748d4173a7783e963d20b5a75f8db8 /fs/ext4/mballoc.c | |
| parent | 393418676a7602e1d7d3f6e560159c65c8cbd50e (diff) | |
| download | linux-2ccb5fb9f113dae969d1ae9b6c10e80fa34f8cd3.tar.xz | |
ext4: Use new buffer_head flag to check uninit group bitmaps initialization
For uninit block group, the on-disk bitmap is not initialized. That
implies we cannot depend on the uptodate flag on the bitmap
buffer_head to find bitmap validity. Use a new buffer_head flag which
would be set after we properly initialize the bitmap. This also
prevents (re-)initializing the uninit group bitmap every time we call
ext4_read_block_bitmap().
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Cc: stable@kernel.org
Diffstat (limited to 'fs/ext4/mballoc.c')
| -rw-r--r-- | fs/ext4/mballoc.c | 24 |
1 files changed, 22 insertions, 2 deletions
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c index aac33590ac64..18a52d39d094 100644 --- a/fs/ext4/mballoc.c +++ b/fs/ext4/mballoc.c @@ -794,22 +794,42 @@ static int ext4_mb_init_cache(struct page *page, char *incore) if (bh[i] == NULL) goto out; - if (buffer_uptodate(bh[i]) && - !(desc->bg_flags & cpu_to_le16(EXT4_BG_BLOCK_UNINIT))) + if (bitmap_uptodate(bh[i])) continue; lock_buffer(bh[i]); + if (bitmap_uptodate(bh[i])) { + unlock_buffer(bh[i]); + continue; + } spin_lock(sb_bgl_lock(EXT4_SB(sb), first_group + i)); if (desc->bg_flags & cpu_to_le16(EXT4_BG_BLOCK_UNINIT)) { ext4_init_block_bitmap(sb, bh[i], first_group + i, desc); + set_bitmap_uptodate(bh[i]); set_buffer_uptodate(bh[i]); spin_unlock(sb_bgl_lock(EXT4_SB(sb), first_group + i)); unlock_buffer(bh[i]); continue; } spin_unlock(sb_bgl_lock(EXT4_SB(sb), first_group + i)); + if (buffer_uptodate(bh[i])) { + /* + * if not uninit if bh is uptodate, + * bitmap is also uptodate + */ + set_bitmap_uptodate(bh[i]); + unlock_buffer(bh[i]); + continue; + } get_bh(bh[i]); + /* + * submit the buffer_head for read. We can + * safely mark the bitmap as uptodate now. + * We do it here so the bitmap uptodate bit + * get set with buffer lock held. + */ + set_bitmap_uptodate(bh[i]); bh[i]->b_end_io = end_buffer_read_sync; submit_bh(READ, bh[i]); mb_debug("read bitmap for group %u\n", first_group + i); |