Subject: + fat-permit-to-return-phy-block-number-by-fibmap-in-fallocated-region.patch added to -mm tree
To: namjae.jeon@xxxxxxxxxxx,a.sahrawat@xxxxxxxxxxx,hirofumi@xxxxxxxxxxxxxxxxxx
From: akpm@xxxxxxxxxxxxxxxxxxxx
Date: Tue, 07 Jan 2014 15:18:55 -0800
The patch titled
Subject: fat: permit to return phy block number by fibmap in fallocated region
has been added to the -mm tree. Its filename is
fat-permit-to-return-phy-block-number-by-fibmap-in-fallocated-region.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/fat-permit-to-return-phy-block-number-by-fibmap-in-fallocated-region.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/fat-permit-to-return-phy-block-number-by-fibmap-in-fallocated-region.patch
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------------------------------------------------------
From: Namjae Jeon <namjae.jeon@xxxxxxxxxxx>
Subject: fat: permit to return phy block number by fibmap in fallocated region
Make the fibmap call the return the proper physical block number for any
offset request in the fallocated range.
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/cache.c | 13 ++++++++++---
fs/fat/fat.h | 3 +++
fs/fat/inode.c | 3 +++
3 files changed, 16 insertions(+), 3 deletions(-)
diff -puN fs/fat/cache.c~fat-permit-to-return-phy-block-number-by-fibmap-in-fallocated-region fs/fat/cache.c
--- a/fs/fat/cache.c~fat-permit-to-return-phy-block-number-by-fibmap-in-fallocated-region
+++ a/fs/fat/cache.c
@@ -325,19 +325,26 @@ int fat_bmap(struct inode *inode, sector
last_block = (i_size_read(inode) + (blocksize - 1)) >> blocksize_bits;
if (sector >= last_block) {
- if (!create)
- return 0;
-
/*
* Both ->mmu_private and ->i_disksize can access
* on only allocation path. (caller must hold ->i_mutex)
*/
last_block = (MSDOS_I(inode)->i_disksize + (blocksize - 1))
>> blocksize_bits;
+ if (!create) {
+ /* Map a block in fallocated region */
+ if (atomic_read(&MSDOS_I(inode)->beyond_isize))
+ if (sector < last_block)
+ goto out_map_cluster;
+
+ return 0;
+ }
+
if (sector >= last_block)
return 0;
}
+out_map_cluster:
cluster = sector >> (sbi->cluster_bits - sb->s_blocksize_bits);
offset = sector & (sbi->sec_per_clus - 1);
cluster = fat_bmap_cluster(inode, cluster);
diff -puN fs/fat/fat.h~fat-permit-to-return-phy-block-number-by-fibmap-in-fallocated-region fs/fat/fat.h
--- a/fs/fat/fat.h~fat-permit-to-return-phy-block-number-by-fibmap-in-fallocated-region
+++ a/fs/fat/fat.h
@@ -129,6 +129,9 @@ struct msdos_inode_info {
struct hlist_node i_dir_hash; /* hash by i_logstart */
struct rw_semaphore truncate_lock; /* protect bmap against truncate */
struct inode vfs_inode;
+
+ /* for getting block number beyond file size in case of fallocate */
+ atomic_t beyond_isize;
};
struct fat_slot_info {
diff -puN fs/fat/inode.c~fat-permit-to-return-phy-block-number-by-fibmap-in-fallocated-region fs/fat/inode.c
--- a/fs/fat/inode.c~fat-permit-to-return-phy-block-number-by-fibmap-in-fallocated-region
+++ a/fs/fat/inode.c
@@ -256,7 +256,10 @@ static sector_t _fat_bmap(struct address
/* fat_get_cluster() assumes the requested blocknr isn't truncated. */
down_read(&MSDOS_I(mapping->host)->truncate_lock);
+ /* To get block number beyond file size in fallocated region */
+ atomic_set(&MSDOS_I(mapping->host)->beyond_isize, 1);
blocknr = generic_block_bmap(mapping, block, fat_get_block);
+ atomic_set(&MSDOS_I(mapping->host)->beyond_isize, 0);
up_read(&MSDOS_I(mapping->host)->truncate_lock);
return blocknr;
_
Patches currently in -mm which might be from namjae.jeon@xxxxxxxxxxx are
fat-add-i_disksize-to-represent-uninitialized-size.patch
fat-add-fat_fallocate-operation.patch
fat-zero-out-seek-range-on-_fat_get_block.patch
fat-fallback-to-buffered-write-in-case-of-fallocated-region-on-direct-io.patch
fat-permit-to-return-phy-block-number-by-fibmap-in-fallocated-region.patch
fat-update-the-limitation-for-fat-fallocate.patch
linux-next.patch
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