From 7e0f236b5b9cc23aa004eb58ee2201f294d0422a Mon Sep 17 00:00:00 2001 From: Namjae Jeon Date: Wed, 20 Jan 2016 14:59:43 -0800 Subject: [PATCH] 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 Signed-off-by: Amit Sahrawat Cc: OGAWA Hirofumi Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/fat/inode.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/fs/fat/inode.c b/fs/fat/inode.c index a6d41fb36a98..0e5bc19c67b1 100644 --- a/fs/fat/inode.c +++ b/fs/fat/inode.c @@ -115,7 +115,7 @@ 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); @@ -135,8 +135,14 @@ 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) -- 2.20.1