diff options
Diffstat (limited to 'fs/xfs/xfs_reflink.c')
| -rw-r--r-- | fs/xfs/xfs_reflink.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/fs/xfs/xfs_reflink.c b/fs/xfs/xfs_reflink.c index 218dee76768b..ad3bcb76d805 100644 --- a/fs/xfs/xfs_reflink.c +++ b/fs/xfs/xfs_reflink.c @@ -1040,6 +1040,22 @@ out_cancel: return error; } +/* Compute the largest atomic write that we can complete through software. */ +xfs_extlen_t +xfs_reflink_max_atomic_cow( + struct xfs_mount *mp) +{ + /* We cannot do any atomic writes without out of place writes. */ + if (!xfs_can_sw_atomic_write(mp)) + return 0; + + /* + * Atomic write limits must always be a power-of-2, according to + * generic_atomic_write_valid. + */ + return rounddown_pow_of_two(xfs_calc_max_atomic_write_fsblocks(mp)); +} + /* * Free all CoW staging blocks that are still referenced by the ondisk refcount * metadata. The ondisk metadata does not track which inode created the |