f2fs: fix to adjust appropriate length for fiemap

If user give a file size as "length" parameter for fiemap
operations, but if this size is non-block size aligned,
it will show 2 segments fiemap results even this whole file
is contiguous on disk, such as the following results:

 ./f2fs_io fiemap 0 19034 ylog/analyzer.py
Fiemap: offset = 0 len = 19034
        logical addr.    physical addr.   length           flags
0       0000000000000000 0000000020baa000 0000000000004000 00001000
1       0000000000004000 0000000020bae000 0000000000001000 00001001

after this patch:
./f2fs_io fiemap 0 19034 ylog/analyzer.py
Fiemap: offset = 0 len = 19034
    logical addr.    physical addr.   length           flags
0    0000000000000000 00000000315f3000 0000000000005000 00001001

Signed-off-by: Zhiguo Niu <zhiguo.niu@unisoc.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 0e8390c..69f1cb0 100644 (file)
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -1938,12 +1938,12 @@ int f2fs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
                        goto out;
        }
 
-       if (F2FS_BYTES_TO_BLK(len) == 0)
-               len = F2FS_BLKSIZE;
-
        start_blk = F2FS_BYTES_TO_BLK(start);
        last_blk = F2FS_BYTES_TO_BLK(start + len - 1);
 
+       if (len & F2FS_BLKSIZE_MASK)
+               len = round_up(len, F2FS_BLKSIZE);
+
 next:
        memset(&map, 0, sizeof(map));
        map.m_lblk = start_blk;

diff --git a/include/linux/f2fs_fs.h b/include/linux/f2fs_fs.h
index 3b2ad44..c24f8bc 100644 (file)
--- a/include/linux/f2fs_fs.h
+++ b/include/linux/f2fs_fs.h
@@ -24,6 +24,7 @@
 #define NEW_ADDR               ((block_t)-1)   /* used as block_t addresses */
 #define COMPRESS_ADDR          ((block_t)-2)   /* used as compressed data flag */
 
+#define F2FS_BLKSIZE_MASK              (F2FS_BLKSIZE - 1)
 #define F2FS_BYTES_TO_BLK(bytes)       ((unsigned long long)(bytes) >> F2FS_BLKSIZE_BITS)
 #define F2FS_BLK_TO_BYTES(blk)         ((unsigned long long)(blk) << F2FS_BLKSIZE_BITS)
 #define F2FS_BLK_END_BYTES(blk)                (F2FS_BLK_TO_BYTES(blk + 1) - 1)