diff options
Diffstat (limited to 'fs/xfs/xfs_exchrange.c')
| -rw-r--r-- | fs/xfs/xfs_exchrange.c | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/fs/xfs/xfs_exchrange.c b/fs/xfs/xfs_exchrange.c index 4cd824e47f75..35351b973521 100644 --- a/fs/xfs/xfs_exchrange.c +++ b/fs/xfs/xfs_exchrange.c @@ -13,8 +13,57 @@ #include "xfs_inode.h" #include "xfs_trans.h" #include "xfs_exchrange.h" +#include "xfs_exchmaps.h" #include <linux/fsnotify.h> +/* Lock (and optionally join) two inodes for a file range exchange. */ +void +xfs_exchrange_ilock( + struct xfs_trans *tp, + struct xfs_inode *ip1, + struct xfs_inode *ip2) +{ + if (ip1 != ip2) + xfs_lock_two_inodes(ip1, XFS_ILOCK_EXCL, + ip2, XFS_ILOCK_EXCL); + else + xfs_ilock(ip1, XFS_ILOCK_EXCL); + if (tp) { + xfs_trans_ijoin(tp, ip1, 0); + if (ip2 != ip1) + xfs_trans_ijoin(tp, ip2, 0); + } + +} + +/* Unlock two inodes after a file range exchange operation. */ +void +xfs_exchrange_iunlock( + struct xfs_inode *ip1, + struct xfs_inode *ip2) +{ + if (ip2 != ip1) + xfs_iunlock(ip2, XFS_ILOCK_EXCL); + xfs_iunlock(ip1, XFS_ILOCK_EXCL); +} + +/* + * Estimate the resource requirements to exchange file contents between the two + * files. The caller is required to hold the IOLOCK and the MMAPLOCK and to + * have flushed both inodes' pagecache and active direct-ios. + */ +int +xfs_exchrange_estimate( + struct xfs_exchmaps_req *req) +{ + int error; + + xfs_exchrange_ilock(NULL, req->ip1, req->ip2); + error = xfs_exchmaps_estimate(req); + xfs_exchrange_iunlock(req->ip1, req->ip2); + return error; +} + /* * Generic code for exchanging ranges of two files via XFS_IOC_EXCHANGE_RANGE. * This part deals with struct file objects and byte ranges and does not deal |