diff options
Diffstat (limited to 'fs/xfs/xfs_reflink.h')
| -rw-r--r-- | fs/xfs/xfs_reflink.h | 21 |
1 files changed, 15 insertions, 6 deletions
diff --git a/fs/xfs/xfs_reflink.h b/fs/xfs/xfs_reflink.h index 65c5dfe17ecf..4a58e4533671 100644 --- a/fs/xfs/xfs_reflink.h +++ b/fs/xfs/xfs_reflink.h @@ -6,14 +6,23 @@ #ifndef __XFS_REFLINK_H #define __XFS_REFLINK_H 1 -static inline bool xfs_is_always_cow_inode(struct xfs_inode *ip) +/* + * Check whether it is safe to free COW fork blocks from an inode. It is unsafe + * to do so when an inode has dirty cache or I/O in-flight, even if no shared + * extents exist in the data fork, because outstanding I/O may target blocks + * that were speculatively allocated to the COW fork. + */ +static inline bool +xfs_can_free_cowblocks(struct xfs_inode *ip) { - return ip->i_mount->m_always_cow && xfs_has_reflink(ip->i_mount); -} + struct inode *inode = VFS_I(ip); -static inline bool xfs_is_cow_inode(struct xfs_inode *ip) -{ - return xfs_is_reflink_inode(ip) || xfs_is_always_cow_inode(ip); + if ((inode->i_state & I_DIRTY_PAGES) || + mapping_tagged(inode->i_mapping, PAGECACHE_TAG_DIRTY) || + mapping_tagged(inode->i_mapping, PAGECACHE_TAG_WRITEBACK) || + atomic_read(&inode->i_dio_count)) + return false; + return true; } extern int xfs_reflink_trim_around_shared(struct xfs_inode *ip, |