diff options
-rw-r--r-- | fs/xfs/libxfs/xfs_inode_fork.h | 9 | ||||
-rw-r--r-- | fs/xfs/xfs_iomap.c | 5 |
2 files changed, 14 insertions, 0 deletions
diff --git a/fs/xfs/libxfs/xfs_inode_fork.h b/fs/xfs/libxfs/xfs_inode_fork.h index 8d89838e23f8..917e289ad962 100644 --- a/fs/xfs/libxfs/xfs_inode_fork.h +++ b/fs/xfs/libxfs/xfs_inode_fork.h @@ -71,6 +71,15 @@ struct xfs_ifork { (XFS_DA_NODE_MAXDEPTH + max(1, rmt_blks)) /* + * A write to a sub-interval of an existing unwritten extent causes the original + * extent to be split into 3 extents + * i.e. | Unwritten | Real | Unwritten | + * Hence extent count can increase by 2. + */ +#define XFS_IEXT_WRITE_UNWRITTEN_CNT (2) + + +/* * Fork handling. */ diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c index 32246d90b9cb..8f4b27cded20 100644 --- a/fs/xfs/xfs_iomap.c +++ b/fs/xfs/xfs_iomap.c @@ -566,6 +566,11 @@ xfs_iomap_write_unwritten( if (error) goto error_on_bmapi_transaction; + error = xfs_iext_count_may_overflow(ip, XFS_DATA_FORK, + XFS_IEXT_WRITE_UNWRITTEN_CNT); + if (error) + goto error_on_bmapi_transaction; + /* * Modify the unwritten extent state of the buffer. */ |