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Commit 7e0f236b authored by Namjae Jeon's avatar Namjae Jeon Committed by Linus Torvalds
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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: default avatarNamjae Jeon <namjae.jeon@samsung.com>
Signed-off-by: default avatarAmit Sahrawat <a.sahrawat@samsung.com>
Cc: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent b13bb33e

fs/fat/inode.c

+8 −2
Original line number Diff line number Diff line
@@ -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)