diff options
Diffstat (limited to 'fs/xfs/xfs_iomap.c')
| -rw-r--r-- | fs/xfs/xfs_iomap.c | 169 |
1 files changed, 102 insertions, 67 deletions
diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c index 07da03976ec1..1bdd7afc1010 100644 --- a/fs/xfs/xfs_iomap.c +++ b/fs/xfs/xfs_iomap.c @@ -48,13 +48,45 @@ xfs_alert_fsblock_zero( return -EFSCORRUPTED; } +u64 +xfs_iomap_inode_sequence( + struct xfs_inode *ip, + u16 iomap_flags) +{ + u64 cookie = 0; + + if (iomap_flags & IOMAP_F_XATTR) + return READ_ONCE(ip->i_af.if_seq); + if ((iomap_flags & IOMAP_F_SHARED) && ip->i_cowfp) + cookie = (u64)READ_ONCE(ip->i_cowfp->if_seq) << 32; + return cookie | READ_ONCE(ip->i_df.if_seq); +} + +/* + * Check that the iomap passed to us is still valid for the given offset and + * length. + */ +static bool +xfs_iomap_valid( + struct inode *inode, + const struct iomap *iomap) +{ + return iomap->validity_cookie == + xfs_iomap_inode_sequence(XFS_I(inode), iomap->flags); +} + +const struct iomap_page_ops xfs_iomap_page_ops = { + .iomap_valid = xfs_iomap_valid, +}; + int xfs_bmbt_to_iomap( struct xfs_inode *ip, struct iomap *iomap, struct xfs_bmbt_irec *imap, unsigned int mapping_flags, - u16 iomap_flags) + u16 iomap_flags, + u64 sequence_cookie) { struct xfs_mount *mp = ip->i_mount; struct xfs_buftarg *target = xfs_inode_buftarg(ip); @@ -91,6 +123,9 @@ xfs_bmbt_to_iomap( if (xfs_ipincount(ip) && (ip->i_itemp->ili_fsync_fields & ~XFS_ILOG_TIMESTAMP)) iomap->flags |= IOMAP_F_DIRTY; + + iomap->validity_cookie = sequence_cookie; + iomap->page_ops = &xfs_iomap_page_ops; return 0; } @@ -195,7 +230,8 @@ xfs_iomap_write_direct( xfs_fileoff_t offset_fsb, xfs_fileoff_t count_fsb, unsigned int flags, - struct xfs_bmbt_irec *imap) + struct xfs_bmbt_irec *imap, + u64 *seq) { struct xfs_mount *mp = ip->i_mount; struct xfs_trans *tp; @@ -285,6 +321,7 @@ xfs_iomap_write_direct( error = xfs_alert_fsblock_zero(ip, imap); out_unlock: + *seq = xfs_iomap_inode_sequence(ip, 0); xfs_iunlock(ip, XFS_ILOCK_EXCL); return error; @@ -743,6 +780,7 @@ xfs_direct_write_iomap_begin( bool shared = false; u16 iomap_flags = 0; unsigned int lockmode = XFS_ILOCK_SHARED; + u64 seq; ASSERT(flags & (IOMAP_WRITE | IOMAP_ZERO)); @@ -811,9 +849,10 @@ xfs_direct_write_iomap_begin( goto out_unlock; } + seq = xfs_iomap_inode_sequence(ip, iomap_flags); xfs_iunlock(ip, lockmode); trace_xfs_iomap_found(ip, offset, length, XFS_DATA_FORK, &imap); - return xfs_bmbt_to_iomap(ip, iomap, &imap, flags, iomap_flags); + return xfs_bmbt_to_iomap(ip, iomap, &imap, flags, iomap_flags, seq); allocate_blocks: error = -EAGAIN; @@ -839,24 +878,26 @@ allocate_blocks: xfs_iunlock(ip, lockmode); error = xfs_iomap_write_direct(ip, offset_fsb, end_fsb - offset_fsb, - flags, &imap); + flags, &imap, &seq); if (error) return error; trace_xfs_iomap_alloc(ip, offset, length, XFS_DATA_FORK, &imap); return xfs_bmbt_to_iomap(ip, iomap, &imap, flags, - iomap_flags | IOMAP_F_NEW); + iomap_flags | IOMAP_F_NEW, seq); out_found_cow: - xfs_iunlock(ip, lockmode); length = XFS_FSB_TO_B(mp, cmap.br_startoff + cmap.br_blockcount); trace_xfs_iomap_found(ip, offset, length - offset, XFS_COW_FORK, &cmap); if (imap.br_startblock != HOLESTARTBLOCK) { - error = xfs_bmbt_to_iomap(ip, srcmap, &imap, flags, 0); + seq = xfs_iomap_inode_sequence(ip, 0); + error = xfs_bmbt_to_iomap(ip, srcmap, &imap, flags, 0, seq); if (error) - return error; + goto out_unlock; } - return xfs_bmbt_to_iomap(ip, iomap, &cmap, flags, IOMAP_F_SHARED); + seq = xfs_iomap_inode_sequence(ip, IOMAP_F_SHARED); + xfs_iunlock(ip, lockmode); + return xfs_bmbt_to_iomap(ip, iomap, &cmap, flags, IOMAP_F_SHARED, seq); out_unlock: if (lockmode) @@ -915,6 +956,7 @@ xfs_buffered_write_iomap_begin( int allocfork = XFS_DATA_FORK; int error = 0; unsigned int lockmode = XFS_ILOCK_EXCL; + u64 seq; if (xfs_is_shutdown(mp)) return -EIO; @@ -1094,26 +1136,31 @@ retry: * Flag newly allocated delalloc blocks with IOMAP_F_NEW so we punch * them out if the write happens to fail. */ + seq = xfs_iomap_inode_sequence(ip, IOMAP_F_NEW); xfs_iunlock(ip, XFS_ILOCK_EXCL); trace_xfs_iomap_alloc(ip, offset, count, allocfork, &imap); - return xfs_bmbt_to_iomap(ip, iomap, &imap, flags, IOMAP_F_NEW); + return xfs_bmbt_to_iomap(ip, iomap, &imap, flags, IOMAP_F_NEW, seq); found_imap: + seq = xfs_iomap_inode_sequence(ip, 0); xfs_iunlock(ip, XFS_ILOCK_EXCL); - return xfs_bmbt_to_iomap(ip, iomap, &imap, flags, 0); + return xfs_bmbt_to_iomap(ip, iomap, &imap, flags, 0, seq); found_cow: - xfs_iunlock(ip, XFS_ILOCK_EXCL); + seq = xfs_iomap_inode_sequence(ip, 0); if (imap.br_startoff <= offset_fsb) { - error = xfs_bmbt_to_iomap(ip, srcmap, &imap, flags, 0); + error = xfs_bmbt_to_iomap(ip, srcmap, &imap, flags, 0, seq); if (error) - return error; + goto out_unlock; + seq = xfs_iomap_inode_sequence(ip, IOMAP_F_SHARED); + xfs_iunlock(ip, XFS_ILOCK_EXCL); return xfs_bmbt_to_iomap(ip, iomap, &cmap, flags, - IOMAP_F_SHARED); + IOMAP_F_SHARED, seq); } xfs_trim_extent(&cmap, offset_fsb, imap.br_startoff - offset_fsb); - return xfs_bmbt_to_iomap(ip, iomap, &cmap, flags, 0); + xfs_iunlock(ip, XFS_ILOCK_EXCL); + return xfs_bmbt_to_iomap(ip, iomap, &cmap, flags, 0, seq); out_unlock: xfs_iunlock(ip, XFS_ILOCK_EXCL); @@ -1121,6 +1168,16 @@ out_unlock: } static int +xfs_buffered_write_delalloc_punch( + struct inode *inode, + loff_t offset, + loff_t length) +{ + return xfs_bmap_punch_delalloc_range(XFS_I(inode), offset, + offset + length); +} + +static int xfs_buffered_write_iomap_end( struct inode *inode, loff_t offset, @@ -1129,56 +1186,17 @@ xfs_buffered_write_iomap_end( unsigned flags, struct iomap *iomap) { - struct xfs_inode *ip = XFS_I(inode); - struct xfs_mount *mp = ip->i_mount; - xfs_fileoff_t start_fsb; - xfs_fileoff_t end_fsb; - int error = 0; - - if (iomap->type != IOMAP_DELALLOC) - return 0; - /* - * Behave as if the write failed if drop writes is enabled. Set the NEW - * flag to force delalloc cleanup. - */ - if (XFS_TEST_ERROR(false, mp, XFS_ERRTAG_DROP_WRITES)) { - iomap->flags |= IOMAP_F_NEW; - written = 0; - } - - /* - * start_fsb refers to the first unused block after a short write. If - * nothing was written, round offset down to point at the first block in - * the range. - */ - if (unlikely(!written)) - start_fsb = XFS_B_TO_FSBT(mp, offset); - else - start_fsb = XFS_B_TO_FSB(mp, offset + written); - end_fsb = XFS_B_TO_FSB(mp, offset + length); + struct xfs_mount *mp = XFS_M(inode->i_sb); + int error; - /* - * Trim delalloc blocks if they were allocated by this write and we - * didn't manage to write the whole range. - * - * We don't need to care about racing delalloc as we hold i_mutex - * across the reserve/allocate/unreserve calls. If there are delalloc - * blocks in the range, they are ours. - */ - if ((iomap->flags & IOMAP_F_NEW) && start_fsb < end_fsb) { - truncate_pagecache_range(VFS_I(ip), XFS_FSB_TO_B(mp, start_fsb), - XFS_FSB_TO_B(mp, end_fsb) - 1); - - error = xfs_bmap_punch_delalloc_range(ip, start_fsb, - end_fsb - start_fsb); - if (error && !xfs_is_shutdown(mp)) { - xfs_alert(mp, "%s: unable to clean up ino %lld", - __func__, ip->i_ino); - return error; - } + error = iomap_file_buffered_write_punch_delalloc(inode, iomap, offset, + length, written, &xfs_buffered_write_delalloc_punch); + if (error && !xfs_is_shutdown(mp)) { + xfs_alert(mp, "%s: unable to clean up ino 0x%llx", + __func__, XFS_I(inode)->i_ino); + return error; } - return 0; } @@ -1187,6 +1205,15 @@ const struct iomap_ops xfs_buffered_write_iomap_ops = { .iomap_end = xfs_buffered_write_iomap_end, }; +/* + * iomap_page_mkwrite() will never fail in a way that requires delalloc extents + * that it allocated to be revoked. Hence we do not need an .iomap_end method + * for this operation. + */ +const struct iomap_ops xfs_page_mkwrite_iomap_ops = { + .iomap_begin = xfs_buffered_write_iomap_begin, +}; + static int xfs_read_iomap_begin( struct inode *inode, @@ -1204,6 +1231,7 @@ xfs_read_iomap_begin( int nimaps = 1, error = 0; bool shared = false; unsigned int lockmode = XFS_ILOCK_SHARED; + u64 seq; ASSERT(!(flags & (IOMAP_WRITE | IOMAP_ZERO))); @@ -1217,13 +1245,14 @@ xfs_read_iomap_begin( &nimaps, 0); if (!error && (flags & IOMAP_REPORT)) error = xfs_reflink_trim_around_shared(ip, &imap, &shared); + seq = xfs_iomap_inode_sequence(ip, shared ? IOMAP_F_SHARED : 0); xfs_iunlock(ip, lockmode); if (error) return error; trace_xfs_iomap_found(ip, offset, length, XFS_DATA_FORK, &imap); return xfs_bmbt_to_iomap(ip, iomap, &imap, flags, - shared ? IOMAP_F_SHARED : 0); + shared ? IOMAP_F_SHARED : 0, seq); } const struct iomap_ops xfs_read_iomap_ops = { @@ -1248,6 +1277,7 @@ xfs_seek_iomap_begin( struct xfs_bmbt_irec imap, cmap; int error = 0; unsigned lockmode; + u64 seq; if (xfs_is_shutdown(mp)) return -EIO; @@ -1282,8 +1312,9 @@ xfs_seek_iomap_begin( if (data_fsb < cow_fsb + cmap.br_blockcount) end_fsb = min(end_fsb, data_fsb); xfs_trim_extent(&cmap, offset_fsb, end_fsb); + seq = xfs_iomap_inode_sequence(ip, IOMAP_F_SHARED); error = xfs_bmbt_to_iomap(ip, iomap, &cmap, flags, - IOMAP_F_SHARED); + IOMAP_F_SHARED, seq); /* * This is a COW extent, so we must probe the page cache * because there could be dirty page cache being backed @@ -1304,8 +1335,9 @@ xfs_seek_iomap_begin( imap.br_startblock = HOLESTARTBLOCK; imap.br_state = XFS_EXT_NORM; done: + seq = xfs_iomap_inode_sequence(ip, 0); xfs_trim_extent(&imap, offset_fsb, end_fsb); - error = xfs_bmbt_to_iomap(ip, iomap, &imap, flags, 0); + error = xfs_bmbt_to_iomap(ip, iomap, &imap, flags, 0, seq); out_unlock: xfs_iunlock(ip, lockmode); return error; @@ -1331,6 +1363,7 @@ xfs_xattr_iomap_begin( struct xfs_bmbt_irec imap; int nimaps = 1, error = 0; unsigned lockmode; + int seq; if (xfs_is_shutdown(mp)) return -EIO; @@ -1347,12 +1380,14 @@ xfs_xattr_iomap_begin( error = xfs_bmapi_read(ip, offset_fsb, end_fsb - offset_fsb, &imap, &nimaps, XFS_BMAPI_ATTRFORK); out_unlock: + + seq = xfs_iomap_inode_sequence(ip, IOMAP_F_XATTR); xfs_iunlock(ip, lockmode); if (error) return error; ASSERT(nimaps); - return xfs_bmbt_to_iomap(ip, iomap, &imap, flags, 0); + return xfs_bmbt_to_iomap(ip, iomap, &imap, flags, IOMAP_F_XATTR, seq); } const struct iomap_ops xfs_xattr_iomap_ops = { |