diff options
Diffstat (limited to 'fs/xfs/xfs_reflink.c')
-rw-r--r-- | fs/xfs/xfs_reflink.c | 107 |
1 files changed, 104 insertions, 3 deletions
diff --git a/fs/xfs/xfs_reflink.c b/fs/xfs/xfs_reflink.c index 8c3211ce..a30be03 100644 --- a/fs/xfs/xfs_reflink.c +++ b/fs/xfs/xfs_reflink.c @@ -229,7 +229,8 @@ static int __xfs_reflink_reserve_cow( struct xfs_inode *ip, xfs_fileoff_t *offset_fsb, - xfs_fileoff_t end_fsb) + xfs_fileoff_t end_fsb, + bool *skipped) { struct xfs_bmbt_irec got, prev, imap; xfs_fileoff_t orig_end_fsb; @@ -262,8 +263,10 @@ __xfs_reflink_reserve_cow( end_fsb = orig_end_fsb = imap.br_startoff + imap.br_blockcount; /* Not shared? Just report the (potentially capped) extent. */ - if (!shared) + if (!shared) { + *skipped = true; goto done; + } /* * Fork all the shared blocks from our write offset until the end of @@ -309,6 +312,7 @@ xfs_reflink_reserve_cow_range( { struct xfs_mount *mp = ip->i_mount; xfs_fileoff_t offset_fsb, end_fsb; + bool skipped = false; int error; trace_xfs_reflink_reserve_cow_range(ip, offset, count); @@ -318,7 +322,8 @@ xfs_reflink_reserve_cow_range( xfs_ilock(ip, XFS_ILOCK_EXCL); while (offset_fsb < end_fsb) { - error = __xfs_reflink_reserve_cow(ip, &offset_fsb, end_fsb); + error = __xfs_reflink_reserve_cow(ip, &offset_fsb, end_fsb, + &skipped); if (error) { trace_xfs_reflink_reserve_cow_range_error(ip, error, _RET_IP_); @@ -330,6 +335,102 @@ xfs_reflink_reserve_cow_range( return error; } +/* Allocate all CoW reservations covering a range of blocks in a file. */ +static int +__xfs_reflink_allocate_cow( + struct xfs_inode *ip, + xfs_fileoff_t *offset_fsb, + xfs_fileoff_t end_fsb) +{ + struct xfs_mount *mp = ip->i_mount; + struct xfs_bmbt_irec imap; + struct xfs_defer_ops dfops; + struct xfs_trans *tp; + xfs_fsblock_t first_block; + xfs_fileoff_t next_fsb; + int nimaps = 1, error; + bool skipped = false; + + xfs_defer_init(&dfops, &first_block); + + error = xfs_trans_alloc(mp, &M_RES(mp)->tr_write, 0, 0, + XFS_TRANS_RESERVE, &tp); + if (error) + return error; + + xfs_ilock(ip, XFS_ILOCK_EXCL); + + next_fsb = *offset_fsb; + error = __xfs_reflink_reserve_cow(ip, &next_fsb, end_fsb, &skipped); + if (error) + goto out_trans_cancel; + + if (skipped) { + *offset_fsb = next_fsb; + goto out_trans_cancel; + } + + xfs_trans_ijoin(tp, ip, 0); + error = xfs_bmapi_write(tp, ip, *offset_fsb, next_fsb - *offset_fsb, + XFS_BMAPI_COWFORK, &first_block, + XFS_EXTENTADD_SPACE_RES(mp, XFS_DATA_FORK), + &imap, &nimaps, &dfops); + if (error) + goto out_trans_cancel; + + /* We might not have been able to map the whole delalloc extent */ + *offset_fsb = min(*offset_fsb + imap.br_blockcount, next_fsb); + + error = xfs_defer_finish(&tp, &dfops, NULL); + if (error) + goto out_trans_cancel; + + error = xfs_trans_commit(tp); + +out_unlock: + xfs_iunlock(ip, XFS_ILOCK_EXCL); + return error; +out_trans_cancel: + xfs_defer_cancel(&dfops); + xfs_trans_cancel(tp); + goto out_unlock; +} + +/* Allocate all CoW reservations covering a part of a file. */ +int +xfs_reflink_allocate_cow_range( + struct xfs_inode *ip, + xfs_off_t offset, + xfs_off_t count) +{ + struct xfs_mount *mp = ip->i_mount; + xfs_fileoff_t offset_fsb = XFS_B_TO_FSBT(mp, offset); + xfs_fileoff_t end_fsb = XFS_B_TO_FSB(mp, offset + count); + int error; + + ASSERT(xfs_is_reflink_inode(ip)); + + trace_xfs_reflink_allocate_cow_range(ip, offset, count); + + /* + * Make sure that the dquots are there. + */ + error = xfs_qm_dqattach(ip, 0); + if (error) + return error; + + while (offset_fsb < end_fsb) { + error = __xfs_reflink_allocate_cow(ip, &offset_fsb, end_fsb); + if (error) { + trace_xfs_reflink_allocate_cow_range_error(ip, error, + _RET_IP_); + break; + } + } + + return error; +} + /* * Find the CoW reservation (and whether or not it needs block allocation) * for a given byte offset of a file. |