diff options
Diffstat (limited to 'fs/xfs/xfs_reflink.h')
| -rw-r--r-- | fs/xfs/xfs_reflink.h | 34 |
1 files changed, 24 insertions, 10 deletions
diff --git a/fs/xfs/xfs_reflink.h b/fs/xfs/xfs_reflink.h index bea65f2fe657..9d1ed9bb0bee 100644 --- a/fs/xfs/xfs_reflink.h +++ b/fs/xfs/xfs_reflink.h @@ -6,20 +6,26 @@ #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_state_read_once(inode) & 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_find_shared(struct xfs_mount *mp, struct xfs_trans *tp, - xfs_agnumber_t agno, xfs_agblock_t agbno, xfs_extlen_t aglen, - xfs_agblock_t *fbno, xfs_extlen_t *flen, bool find_maximal); -extern int xfs_reflink_trim_around_shared(struct xfs_inode *ip, +int xfs_reflink_trim_around_shared(struct xfs_inode *ip, struct xfs_bmbt_irec *irec, bool *shared); int xfs_bmap_trim_cow(struct xfs_inode *ip, struct xfs_bmbt_irec *imap, bool *shared); @@ -29,6 +35,8 @@ int xfs_reflink_allocate_cow(struct xfs_inode *ip, struct xfs_bmbt_irec *imap, bool convert_now); extern int xfs_reflink_convert_cow(struct xfs_inode *ip, xfs_off_t offset, xfs_off_t count); +int xfs_reflink_convert_cow_locked(struct xfs_inode *ip, + xfs_fileoff_t offset_fsb, xfs_filblks_t count_fsb); extern int xfs_reflink_cancel_cow_blocks(struct xfs_inode *ip, struct xfs_trans **tpp, xfs_fileoff_t offset_fsb, @@ -37,6 +45,8 @@ extern int xfs_reflink_cancel_cow_range(struct xfs_inode *ip, xfs_off_t offset, xfs_off_t count, bool cancel_real); extern int xfs_reflink_end_cow(struct xfs_inode *ip, xfs_off_t offset, xfs_off_t count); +int xfs_reflink_end_atomic_cow(struct xfs_inode *ip, xfs_off_t offset, + xfs_off_t count); extern int xfs_reflink_recover_cow(struct xfs_mount *mp); extern loff_t xfs_reflink_remap_range(struct file *file_in, loff_t pos_in, struct file *file_out, loff_t pos_out, loff_t len, @@ -56,4 +66,8 @@ extern int xfs_reflink_remap_blocks(struct xfs_inode *src, loff_t pos_in, extern int xfs_reflink_update_dest(struct xfs_inode *dest, xfs_off_t newlen, xfs_extlen_t cowextsize, unsigned int remap_flags); +bool xfs_reflink_supports_rextsize(struct xfs_mount *mp, unsigned int rextsize); + +xfs_extlen_t xfs_reflink_max_atomic_cow(struct xfs_mount *mp); + #endif /* __XFS_REFLINK_H */ |