The patch titled
Subject: fat: skip cluster allocation on fallocated region
has been added to the -mm tree. Its filename is
fat-skip-cluster-allocation-on-fallocated-region.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/fat-skip-cluster-allocation-on-fallocated-region.patch
echo and later at
echo http://ozlabs.org/~akpm/mmotm/broken-out/fat-skip-cluster-allocation-on-fallocated-region.patch
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------------------------------------------------------
From: Namjae Jeon <namjae.jeon@xxxxxxxxxxx>
Subject: 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@xxxxxxxxxxx>
Signed-off-by: Amit Sahrawat <a.sahrawat@xxxxxxxxxxx>
Cc: OGAWA Hirofumi <hirofumi@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/fat/inode.c | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)
diff -puN fs/fat/inode.c~fat-skip-cluster-allocation-on-fallocated-region fs/fat/inode.c
--- a/fs/fat/inode.c~fat-skip-cluster-allocation-on-fallocated-region
+++ a/fs/fat/inode.c
@@ -123,7 +123,7 @@ static inline int __fat_get_block(struct
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);
@@ -143,8 +143,14 @@ static inline int __fat_get_block(struct
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)
_
Patches currently in -mm which might be from namjae.jeon@xxxxxxxxxxx are
fat-add-fat_fallocate-operation.patch
fat-skip-cluster-allocation-on-fallocated-region.patch
fat-permit-to-return-phy-block-number-by-fibmap-in-fallocated-region.patch
documentation-filesystems-vfattxt-update-the-limitation-for-fat-fallocate.patch
fat-fix-data-past-eof-resulting-from-fsx-testsuite.patch
fat-fix-data-past-eof-resulting-from-fsx-testsuite-v2.patch
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