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| author | Namjae Jeon <namjae.jeon@samsung.com> | 2015-05-14 01:02:00 +0000 |
|---|---|---|
| committer | Johannes Weiner <hannes@cmpxchg.org> | 2015-05-14 01:02:00 +0000 |
| commit | d0ad88a6be3b7cad279487e93c71fd5fe86c07ce (patch) | |
| tree | 290bc157527ce7f82ab101d5b481dd24c9804341 | |
| parent | 40622f82b6308834697f22656d3cf56d6fcf64c9 (diff) | |
| download | mm-next-d0ad88a6be3b7cad279487e93c71fd5fe86c07ce.tar.gz | |
fat: skip cluster allocation on fallocated region
Skip new cluster allocation after checking i_blocks limit in _fat_get_block,
because the blocks are already allocated in fallocated region.
Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>
Signed-off-by: Amit Sahrawat <a.sahrawat@samsung.com>
Cc: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
| -rw-r--r-- | fs/fat/inode.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/fs/fat/inode.c b/fs/fat/inode.c index 3daf3dc88698fd..3244f064311b8a 100644 --- a/fs/fat/inode.c +++ b/fs/fat/inode.c @@ -114,7 +114,7 @@ static inline int __fat_get_block(struct inode *inode, sector_t iblock, struct super_block *sb = inode->i_sb; struct msdos_sb_info *sbi = MSDOS_SB(sb); unsigned long mapped_blocks; - sector_t phys; + sector_t phys, last_block; int err, offset; err = fat_bmap(inode, iblock, &phys, &mapped_blocks, create); @@ -134,8 +134,14 @@ static inline int __fat_get_block(struct inode *inode, sector_t iblock, return -EIO; } + last_block = inode->i_blocks >> (sb->s_blocksize_bits - 9); offset = (unsigned long)iblock & (sbi->sec_per_clus - 1); - if (!offset) { + /* + * allocate a cluster according to the following. + * 1) no more available blocks + * 2) not part of fallocate region + */ + if (!offset && !(iblock < last_block)) { /* TODO: multiple cluster allocation would be desirable. */ err = fat_add_cluster(inode); if (err) |