In dax mode, use a new range compare function provided by dax framework. Don't share dax file with non-dax file. Use xfs lock and xfs_break_layouts() to simplify the lock and break layout operation, and rename to xfs_reflink_remap_lock_and_break_layout() in order to echo the unlock function: xfs_reflink_remap_unlock().
Signed-off-by: Shiyang Ruan <[email protected]> --- fs/xfs/xfs_reflink.c | 83 +++++++++++++++++++++++--------------------- 1 file changed, 44 insertions(+), 39 deletions(-) diff --git a/fs/xfs/xfs_reflink.c b/fs/xfs/xfs_reflink.c index a1b000be3699..096751d7990a 100644 --- a/fs/xfs/xfs_reflink.c +++ b/fs/xfs/xfs_reflink.c @@ -1209,39 +1209,37 @@ xfs_reflink_remap_blocks( * src iolock held, and therefore have to back out both locks. */ static int -xfs_iolock_two_inodes_and_break_layout( - struct inode *src, - struct inode *dest) +xfs_reflink_remap_lock_and_break_layout( + struct file *file_in, + struct file *file_out) { int error; + struct inode *inode_in = file_inode(file_in); + struct xfs_inode *src = XFS_I(inode_in); + struct inode *inode_out = file_inode(file_out); + struct xfs_inode *dest = XFS_I(inode_out); + + uint src_iolock = XFS_IOLOCK_SHARED | XFS_MMAPLOCK_SHARED; + uint dest_iolock = XFS_IOLOCK_EXCL | XFS_MMAPLOCK_EXCL; -retry: - if (src < dest) { - inode_lock_shared(src); - inode_lock_nested(dest, I_MUTEX_NONDIR2); + if (src->i_ino < dest->i_ino) { + xfs_ilock(src, src_iolock); + xfs_ilock(dest, dest_iolock); } else { - /* src >= dest */ - inode_lock(dest); + /* inode_in >= inode_out */ + xfs_ilock(dest, dest_iolock); } - error = break_layout(dest, false); - if (error == -EWOULDBLOCK) { - inode_unlock(dest); - if (src < dest) - inode_unlock_shared(src); - error = break_layout(dest, true); - if (error) - return error; - goto retry; - } + error = xfs_break_layouts(inode_out, &dest_iolock, BREAK_UNMAP); if (error) { - inode_unlock(dest); - if (src < dest) - inode_unlock_shared(src); + xfs_iunlock(dest, dest_iolock); + if (src->i_ino < dest->i_ino) + xfs_iunlock(src, src_iolock); return error; } - if (src > dest) - inode_lock_shared_nested(src, I_MUTEX_NONDIR2); + + if (src->i_ino > dest->i_ino) + xfs_ilock(src, src_iolock); return 0; } @@ -1257,12 +1255,12 @@ xfs_reflink_remap_unlock( struct xfs_inode *dest = XFS_I(inode_out); bool same_inode = (inode_in == inode_out); - xfs_iunlock(dest, XFS_MMAPLOCK_EXCL); - if (!same_inode) - xfs_iunlock(src, XFS_MMAPLOCK_SHARED); - inode_unlock(inode_out); + uint src_iolock = XFS_IOLOCK_SHARED | XFS_MMAPLOCK_SHARED; + uint dest_iolock = XFS_IOLOCK_EXCL | XFS_MMAPLOCK_EXCL; + + xfs_iunlock(dest, dest_iolock); if (!same_inode) - inode_unlock_shared(inode_in); + xfs_iunlock(src, src_iolock); } /* @@ -1285,6 +1283,14 @@ xfs_reflink_zero_posteof( &xfs_iomap_ops); } +int xfs_reflink_dedupe_file_range_compare(struct inode *src, loff_t srcoff, + struct inode *dest, loff_t destoff, + loff_t len, bool *is_same) +{ + return dax_file_range_compare(src, srcoff, dest, destoff, len, is_same, + &xfs_iomap_ops); +} + /* * Prepare two files for range cloning. Upon a successful return both inodes * will have the iolock and mmaplock held, the page cache of the out file will @@ -1327,18 +1333,13 @@ xfs_reflink_remap_prep( struct xfs_inode *src = XFS_I(inode_in); struct inode *inode_out = file_inode(file_out); struct xfs_inode *dest = XFS_I(inode_out); - bool same_inode = (inode_in == inode_out); ssize_t ret; + compare_range_t cmp; /* Lock both files against IO */ - ret = xfs_iolock_two_inodes_and_break_layout(inode_in, inode_out); + ret = xfs_reflink_remap_lock_and_break_layout(file_in, file_out); if (ret) return ret; - if (same_inode) - xfs_ilock(src, XFS_MMAPLOCK_EXCL); - else - xfs_lock_two_inodes(src, XFS_MMAPLOCK_SHARED, dest, - XFS_MMAPLOCK_EXCL); /* Check file eligibility and prepare for block sharing. */ ret = -EINVAL; @@ -1346,12 +1347,16 @@ xfs_reflink_remap_prep( if (XFS_IS_REALTIME_INODE(src) || XFS_IS_REALTIME_INODE(dest)) goto out_unlock; - /* Don't share DAX file data for now. */ - if (IS_DAX(inode_in) || IS_DAX(inode_out)) + /* Don't share DAX file data with non-DAX file. */ + if (IS_DAX(inode_in) != IS_DAX(inode_out)) goto out_unlock; + if (IS_DAX(inode_in)) + cmp = xfs_reflink_dedupe_file_range_compare; + else + cmp = vfs_dedupe_file_range_compare; ret = generic_remap_file_range_prep(file_in, pos_in, file_out, pos_out, - len, remap_flags, vfs_dedupe_file_range_compare); + len, remap_flags, cmp); if (ret < 0 || *len == 0) goto out_unlock; -- 2.17.0
