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
and later at
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_disksize 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, 9 insertions(+), 1 deletion(-)
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
@@ -120,6 +120,14 @@ static int fat_add_cluster(struct inode
return err;
}
+static inline int check_fallocated_region(struct inode *inode, sector_t iblock)
+{
+ struct super_block *sb = inode->i_sb;
+ sector_t last_disk_block = MSDOS_I(inode)->i_disksize >>
+ sb->s_blocksize_bits;
+ return iblock < last_disk_block;
+}
+
static inline int __fat_get_block(struct inode *inode, sector_t iblock,
unsigned long *max_blocks,
struct buffer_head *bh_result, int create)
@@ -148,7 +156,7 @@ static inline int __fat_get_block(struct
}
offset = (unsigned long)iblock & (sbi->sec_per_clus - 1);
- if (!offset) {
+ if (!offset && !check_fallocated_region(inode, iblock)) {
/* 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
linux-next.patch
fat-add-i_disksize-to-represent-uninitialized-size.patch
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
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