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f2fs: read isize while holding i_mutex in fiemap 

make sure the isize we read doesn't change during the process.

Signed-off-by: Fan li <fanofcode.li@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Fan Li 2016-01-04 15:56:50 +08:00 committed by Jaegeuk Kim
parent 957efb0c21
commit de1475cc53
1 changed files with 3 additions and 1 deletions
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4
fs/f2fs/data.c
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@ -784,7 +784,7 @@ int f2fs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
{
struct buffer_head map_bh;
sector_t start_blk, last_blk;
loff_t isize = i_size_read(inode);
loff_t isize;
u64 logical = 0, phys = 0, size = 0;
u32 flags = 0;
int ret = 0;
@ -800,6 +800,8 @@ int f2fs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
}
mutex_lock(&inode->i_mutex);
isize = i_size_read(inode);
if (start >= isize)
goto out;