Subject: + fat-zero-out-seek-range-on-_fat_get_block-v4.patch added to -mm tree
To: namjae.jeon@xxxxxxxxxxx,a.sahrawat@xxxxxxxxxxx,hirofumi@xxxxxxxxxxxxxxxxxx
From: akpm@xxxxxxxxxxxxxxxxxxxx
Date: Tue, 04 Mar 2014 13:20:02 -0800
The patch titled
Subject: fat: zero out seek range on _fat_get_block
has been added to the -mm tree. Its filename is
fat-zero-out-seek-range-on-_fat_get_block-v4.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/fat-zero-out-seek-range-on-_fat_get_block-v4.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/fat-zero-out-seek-range-on-_fat_get_block-v4.patch
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From: Namjae Jeon <namjae.jeon@xxxxxxxxxxx>
Subject: fat: zero out seek range on _fat_get_block
For normal buffered write operations, normally if we try to write to an
offset > than file size, it does a cont_expand_zero till that offset.
Now, in case of fallocated regions, since the blocks are already
allocated. So, make it zero out that buffers for those blocks till the
seek'ed offset.
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 | 24 +++++++++++++++++++++++-
1 file changed, 23 insertions(+), 1 deletion(-)
diff -puN fs/fat/inode.c~fat-zero-out-seek-range-on-_fat_get_block-v4 fs/fat/inode.c
--- a/fs/fat/inode.c~fat-zero-out-seek-range-on-_fat_get_block-v4
+++ a/fs/fat/inode.c
@@ -54,6 +54,25 @@ static int fat_add_cluster(struct inode
return err;
}
+static void check_fallocated_region(struct inode *inode, sector_t iblock,
+ unsigned long *max_blocks, struct buffer_head *bh_result)
+{
+ struct super_block *sb = inode->i_sb;
+ sector_t last_block, disk_block;
+ const unsigned long blocksize = sb->s_blocksize;
+ const unsigned char blocksize_bits = sb->s_blocksize_bits;
+
+ last_block = (MSDOS_I(inode)->mmu_private + (blocksize - 1))
+ >> blocksize_bits;
+ disk_block = (MSDOS_I(inode)->i_disksize + (blocksize - 1))
+ >> blocksize_bits;
+ if (iblock >= last_block && iblock <= disk_block) {
+ MSDOS_I(inode)->mmu_private += *max_blocks << blocksize_bits;
+ set_buffer_new(bh_result);
+ }
+
+}
+
static inline int __fat_get_block(struct inode *inode, sector_t iblock,
unsigned long *max_blocks,
struct buffer_head *bh_result, int create)
@@ -68,8 +87,11 @@ static inline int __fat_get_block(struct
if (err)
return err;
if (phys) {
- map_bh(bh_result, sb, phys);
*max_blocks = min(mapped_blocks, *max_blocks);
+ if (create)
+ check_fallocated_region(inode, iblock, max_blocks,
+ bh_result);
+ map_bh(bh_result, sb, phys);
return 0;
}
if (!create)
_
Patches currently in -mm which might be from namjae.jeon@xxxxxxxxxxx are
fat-add-i_disksize-to-represent-uninitialized-size-v4.patch
fat-add-fat_fallocate-operation-v4.patch
fat-zero-out-seek-range-on-_fat_get_block-v4.patch
fat-fallback-to-buffered-write-in-case-of-fallocated-region-on-direct-io-v4.patch
fat-permit-to-return-phy-block-number-by-fibmap-in-fallocated-region-v4.patch
documentation-filesystems-vfattxt-update-the-limitation-for-fat-fallocate.patch
linux-next.patch
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