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19de7351 DC |
1 | /* |
2 | * Copyright (c) 2012 Red Hat, Inc. All rights reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it would be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License | |
14 | * along with this program; if not, write the Free Software Foundation, | |
15 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
16 | */ | |
17 | #ifndef __XFS_SYMLINK_H | |
18 | #define __XFS_SYMLINK_H 1 | |
19 | ||
f948dd76 DC |
20 | struct xfs_mount; |
21 | struct xfs_trans; | |
22 | struct xfs_inode; | |
23 | struct xfs_buf; | |
24 | struct xfs_ifork; | |
25 | struct xfs_name; | |
26 | ||
27 | #define XFS_SYMLINK_MAGIC 0x58534c4d /* XSLM */ | |
28 | ||
29 | struct xfs_dsymlink_hdr { | |
30 | __be32 sl_magic; | |
31 | __be32 sl_offset; | |
32 | __be32 sl_bytes; | |
33 | __be32 sl_crc; | |
34 | uuid_t sl_uuid; | |
35 | __be64 sl_owner; | |
36 | __be64 sl_blkno; | |
37 | __be64 sl_lsn; | |
38 | }; | |
39 | ||
19de7351 DC |
40 | /* |
41 | * The maximum pathlen is 1024 bytes. Since the minimum file system | |
f948dd76 DC |
42 | * blocksize is 512 bytes, we can get a max of 3 extents back from |
43 | * bmapi when crc headers are taken into account. | |
19de7351 | 44 | */ |
f948dd76 DC |
45 | #define XFS_SYMLINK_MAPS 3 |
46 | ||
47 | #define XFS_SYMLINK_BUF_SPACE(mp, bufsize) \ | |
48 | ((bufsize) - (xfs_sb_version_hascrc(&(mp)->m_sb) ? \ | |
49 | sizeof(struct xfs_dsymlink_hdr) : 0)) | |
50 | ||
51 | int xfs_symlink_blocks(struct xfs_mount *mp, int pathlen); | |
19de7351 DC |
52 | |
53 | void xfs_symlink_local_to_remote(struct xfs_trans *tp, struct xfs_buf *bp, | |
54 | struct xfs_inode *ip, struct xfs_ifork *ifp); | |
55 | ||
f948dd76 DC |
56 | extern const struct xfs_buf_ops xfs_symlink_buf_ops; |
57 | ||
19de7351 DC |
58 | #ifdef __KERNEL__ |
59 | ||
60 | int xfs_symlink(struct xfs_inode *dp, struct xfs_name *link_name, | |
61 | const char *target_path, umode_t mode, struct xfs_inode **ipp); | |
62 | int xfs_readlink(struct xfs_inode *ip, char *link); | |
63 | int xfs_inactive_symlink_rmt(struct xfs_inode *ip, struct xfs_trans **tpp); | |
64 | ||
65 | #endif /* __KERNEL__ */ | |
66 | #endif /* __XFS_SYMLINK_H */ |