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| author | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-07-16 09:04:54 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-07-16 09:04:54 +0200 |
| commit | 83cf9cd6d50ed4f7e6ae265e80e38b235c792f5f (patch) | |
| tree | 6016c386c321cd6a3e8575e01ed9f10834fc5081 /fs/xfs/libxfs/xfs_bmap.c | |
| parent | 34bcfdac8c92cc7971254ba5856afd12047c50b2 (diff) | |
| parent | 9d3cce1e8b8561fed5f383d22a4d6949db4eadbe (diff) | |
Merge 4.18-rc5 into char-misc-next
We want the char-misc fixes in here as well.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs/xfs/libxfs/xfs_bmap.c')
| -rw-r--r-- | fs/xfs/libxfs/xfs_bmap.c | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/fs/xfs/libxfs/xfs_bmap.c b/fs/xfs/libxfs/xfs_bmap.c index 01628f0c9a0c..7205268b30bc 100644 --- a/fs/xfs/libxfs/xfs_bmap.c +++ b/fs/xfs/libxfs/xfs_bmap.c @@ -5780,6 +5780,32 @@ del_cursor: return error; } +/* Make sure we won't be right-shifting an extent past the maximum bound. */ +int +xfs_bmap_can_insert_extents( + struct xfs_inode *ip, + xfs_fileoff_t off, + xfs_fileoff_t shift) +{ + struct xfs_bmbt_irec got; + int is_empty; + int error = 0; + + ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL)); + + if (XFS_FORCED_SHUTDOWN(ip->i_mount)) + return -EIO; + + xfs_ilock(ip, XFS_ILOCK_EXCL); + error = xfs_bmap_last_extent(NULL, ip, XFS_DATA_FORK, &got, &is_empty); + if (!error && !is_empty && got.br_startoff >= off && + ((got.br_startoff + shift) & BMBT_STARTOFF_MASK) < got.br_startoff) + error = -EINVAL; + xfs_iunlock(ip, XFS_ILOCK_EXCL); + + return error; +} + int xfs_bmap_insert_extents( struct xfs_trans *tp, |