diff options
Diffstat (limited to 'fs/xfs/xfs_iomap.c')
| -rw-r--r-- | fs/xfs/xfs_iomap.c | 68 |
1 files changed, 58 insertions, 10 deletions
diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c index c08253e11545..436e109bb01e 100644 --- a/fs/xfs/xfs_iomap.c +++ b/fs/xfs/xfs_iomap.c @@ -39,6 +39,7 @@ #include "xfs_quota.h" #include "xfs_dquot_item.h" #include "xfs_dquot.h" +#include "xfs_reflink.h" #define XFS_WRITEIO_ALIGN(mp,off) (((off) >> mp->m_writeio_log) \ @@ -70,7 +71,7 @@ xfs_bmbt_to_iomap( iomap->bdev = xfs_find_bdev_for_inode(VFS_I(ip)); } -static xfs_extlen_t +xfs_extlen_t xfs_eof_alignment( struct xfs_inode *ip, xfs_extlen_t extsize) @@ -565,6 +566,17 @@ xfs_file_iomap_begin_delay( xfs_bmap_search_extents(ip, offset_fsb, XFS_DATA_FORK, &eof, &idx, &got, &prev); if (!eof && got.br_startoff <= offset_fsb) { + if (xfs_is_reflink_inode(ip)) { + bool shared; + + end_fsb = min(XFS_B_TO_FSB(mp, offset + count), + maxbytes_fsb); + xfs_trim_extent(&got, offset_fsb, end_fsb - offset_fsb); + error = xfs_reflink_reserve_cow(ip, &got, &shared); + if (error) + goto out_unlock; + } + trace_xfs_iomap_found(ip, offset, count, 0, &got); goto done; } @@ -609,7 +621,7 @@ xfs_file_iomap_begin_delay( } retry: - error = xfs_bmapi_reserve_delalloc(ip, offset_fsb, + error = xfs_bmapi_reserve_delalloc(ip, XFS_DATA_FORK, offset_fsb, end_fsb - offset_fsb, &got, &prev, &idx, eof); switch (error) { @@ -666,6 +678,7 @@ out_unlock: int xfs_iomap_write_allocate( xfs_inode_t *ip, + int whichfork, xfs_off_t offset, xfs_bmbt_irec_t *imap) { @@ -678,8 +691,12 @@ xfs_iomap_write_allocate( xfs_trans_t *tp; int nimaps; int error = 0; + int flags = 0; int nres; + if (whichfork == XFS_COW_FORK) + flags |= XFS_BMAPI_COWFORK; + /* * Make sure that the dquots are there. */ @@ -773,7 +790,7 @@ xfs_iomap_write_allocate( * pointer that the caller gave to us. */ error = xfs_bmapi_write(tp, ip, map_start_fsb, - count_fsb, 0, &first_block, + count_fsb, flags, &first_block, nres, imap, &nimaps, &dfops); if (error) @@ -956,18 +973,29 @@ xfs_file_iomap_begin( struct xfs_bmbt_irec imap; xfs_fileoff_t offset_fsb, end_fsb; int nimaps = 1, error = 0; + bool shared = false, trimmed = false; unsigned lockmode; if (XFS_FORCED_SHUTDOWN(mp)) return -EIO; - if ((flags & IOMAP_WRITE) && - !IS_DAX(inode) && !xfs_get_extsz_hint(ip)) { + if ((flags & IOMAP_WRITE) && !IS_DAX(inode) && + !xfs_get_extsz_hint(ip)) { + /* Reserve delalloc blocks for regular writeback. */ return xfs_file_iomap_begin_delay(inode, offset, length, flags, iomap); } - lockmode = xfs_ilock_data_map_shared(ip); + /* + * COW writes will allocate delalloc space, so we need to make sure + * to take the lock exclusively here. + */ + if ((flags & (IOMAP_WRITE | IOMAP_ZERO)) && xfs_is_reflink_inode(ip)) { + lockmode = XFS_ILOCK_EXCL; + xfs_ilock(ip, XFS_ILOCK_EXCL); + } else { + lockmode = xfs_ilock_data_map_shared(ip); + } ASSERT(offset <= mp->m_super->s_maxbytes); if ((xfs_fsize_t)offset + length > mp->m_super->s_maxbytes) @@ -976,10 +1004,25 @@ xfs_file_iomap_begin( end_fsb = XFS_B_TO_FSB(mp, offset + length); error = xfs_bmapi_read(ip, offset_fsb, end_fsb - offset_fsb, &imap, - &nimaps, XFS_BMAPI_ENTIRE); - if (error) { - xfs_iunlock(ip, lockmode); - return error; + &nimaps, 0); + if (error) + goto out_unlock; + + if (flags & IOMAP_REPORT) { + /* Trim the mapping to the nearest shared extent boundary. */ + error = xfs_reflink_trim_around_shared(ip, &imap, &shared, + &trimmed); + if (error) + goto out_unlock; + } + + if ((flags & (IOMAP_WRITE | IOMAP_ZERO)) && xfs_is_reflink_inode(ip)) { + error = xfs_reflink_reserve_cow(ip, &imap, &shared); + if (error) + goto out_unlock; + + end_fsb = imap.br_startoff + imap.br_blockcount; + length = XFS_FSB_TO_B(mp, end_fsb) - offset; } if ((flags & IOMAP_WRITE) && imap_needs_alloc(inode, &imap, nimaps)) { @@ -1015,7 +1058,12 @@ xfs_file_iomap_begin( } xfs_bmbt_to_iomap(ip, iomap, &imap); + if (shared) + iomap->flags |= IOMAP_F_SHARED; return 0; +out_unlock: + xfs_iunlock(ip, lockmode); + return error; } static int |
