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>
---
fs/fat/inode.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/fs/fat/inode.c b/fs/fat/inode.c
index b6a2da2..ecd455c 100644
--- a/fs/fat/inode.c
+++ b/fs/fat/inode.c
@@ -120,6 +120,14 @@ static int fat_add_cluster(struct inode *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 inode *inode, sector_t iblock,
}
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)
--
1.7.11-rc0
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