10b61f8a4SDave Chinner // SPDX-License-Identifier: GPL-2.0
219de7351SDave Chinner /*
319de7351SDave Chinner * Copyright (c) 2000-2006 Silicon Graphics, Inc.
419de7351SDave Chinner * Copyright (c) 2012-2013 Red Hat, Inc.
519de7351SDave Chinner * All rights reserved.
619de7351SDave Chinner */
719de7351SDave Chinner #include "xfs.h"
8239880efSDave Chinner #include "xfs_shared.h"
919de7351SDave Chinner #include "xfs_fs.h"
106ca1c906SDave Chinner #include "xfs_format.h"
11239880efSDave Chinner #include "xfs_log_format.h"
12239880efSDave Chinner #include "xfs_trans_resv.h"
1319de7351SDave Chinner #include "xfs_bit.h"
1419de7351SDave Chinner #include "xfs_mount.h"
152b9ab5abSDave Chinner #include "xfs_dir2.h"
1619de7351SDave Chinner #include "xfs_inode.h"
1719de7351SDave Chinner #include "xfs_bmap.h"
18a4fbe6abSDave Chinner #include "xfs_bmap_btree.h"
1919de7351SDave Chinner #include "xfs_quota.h"
205f213ddbSDarrick J. Wong #include "xfs_symlink.h"
2119de7351SDave Chinner #include "xfs_trans_space.h"
2219de7351SDave Chinner #include "xfs_trace.h"
23239880efSDave Chinner #include "xfs_trans.h"
24b652afd9SDave Chinner #include "xfs_ialloc.h"
257b7820b8SDarrick J. Wong #include "xfs_error.h"
2619de7351SDave Chinner
2719de7351SDave Chinner /* ----- Kernel only functions below ----- */
285da8f2f8SDarrick J. Wong int
xfs_readlink_bmap_ilocked(struct xfs_inode * ip,char * link)295da8f2f8SDarrick J. Wong xfs_readlink_bmap_ilocked(
30f948dd76SDave Chinner struct xfs_inode *ip,
3119de7351SDave Chinner char *link)
3219de7351SDave Chinner {
33f948dd76SDave Chinner struct xfs_mount *mp = ip->i_mount;
34f948dd76SDave Chinner struct xfs_bmbt_irec mval[XFS_SYMLINK_MAPS];
35f948dd76SDave Chinner struct xfs_buf *bp;
36f948dd76SDave Chinner xfs_daddr_t d;
37f948dd76SDave Chinner char *cur_chunk;
3813d2c10bSChristoph Hellwig int pathlen = ip->i_disk_size;
3919de7351SDave Chinner int nmaps = XFS_SYMLINK_MAPS;
4019de7351SDave Chinner int byte_cnt;
4119de7351SDave Chinner int n;
4219de7351SDave Chinner int error = 0;
43f948dd76SDave Chinner int fsblocks = 0;
44f948dd76SDave Chinner int offset;
4519de7351SDave Chinner
4629db2500SChristoph Hellwig ASSERT(xfs_isilocked(ip, XFS_ILOCK_SHARED | XFS_ILOCK_EXCL));
4729db2500SChristoph Hellwig
48f948dd76SDave Chinner fsblocks = xfs_symlink_blocks(mp, pathlen);
49f948dd76SDave Chinner error = xfs_bmapi_read(ip, 0, fsblocks, mval, &nmaps, 0);
5019de7351SDave Chinner if (error)
5119de7351SDave Chinner goto out;
5219de7351SDave Chinner
53f948dd76SDave Chinner offset = 0;
5419de7351SDave Chinner for (n = 0; n < nmaps; n++) {
5519de7351SDave Chinner d = XFS_FSB_TO_DADDR(mp, mval[n].br_startblock);
5619de7351SDave Chinner byte_cnt = XFS_FSB_TO_B(mp, mval[n].br_blockcount);
5719de7351SDave Chinner
580e3eccceSDarrick J. Wong error = xfs_buf_read(mp->m_ddev_targp, d, BTOBB(byte_cnt), 0,
590e3eccceSDarrick J. Wong &bp, &xfs_symlink_buf_ops);
600e3eccceSDarrick J. Wong if (error)
610e3eccceSDarrick J. Wong return error;
62f948dd76SDave Chinner byte_cnt = XFS_SYMLINK_BUF_SPACE(mp, byte_cnt);
6319de7351SDave Chinner if (pathlen < byte_cnt)
6419de7351SDave Chinner byte_cnt = pathlen;
6519de7351SDave Chinner
66f948dd76SDave Chinner cur_chunk = bp->b_addr;
6738c26bfdSDave Chinner if (xfs_has_crc(mp)) {
68bda65ef8SEric Sandeen if (!xfs_symlink_hdr_ok(ip->i_ino, offset,
69f948dd76SDave Chinner byte_cnt, bp)) {
702451337dSDave Chinner error = -EFSCORRUPTED;
71f948dd76SDave Chinner xfs_alert(mp,
72f948dd76SDave Chinner "symlink header does not match required off/len/owner (0x%x/Ox%x,0x%llx)",
73f948dd76SDave Chinner offset, byte_cnt, ip->i_ino);
74f948dd76SDave Chinner xfs_buf_relse(bp);
75f948dd76SDave Chinner goto out;
76f948dd76SDave Chinner
77f948dd76SDave Chinner }
78f948dd76SDave Chinner
79f948dd76SDave Chinner cur_chunk += sizeof(struct xfs_dsymlink_hdr);
80f948dd76SDave Chinner }
81f948dd76SDave Chinner
822ac56d3dSEric Sandeen memcpy(link + offset, cur_chunk, byte_cnt);
83f948dd76SDave Chinner
84f948dd76SDave Chinner pathlen -= byte_cnt;
85f948dd76SDave Chinner offset += byte_cnt;
86f948dd76SDave Chinner
8719de7351SDave Chinner xfs_buf_relse(bp);
8819de7351SDave Chinner }
89f948dd76SDave Chinner ASSERT(pathlen == 0);
9019de7351SDave Chinner
9113d2c10bSChristoph Hellwig link[ip->i_disk_size] = '\0';
9219de7351SDave Chinner error = 0;
9319de7351SDave Chinner
9419de7351SDave Chinner out:
9519de7351SDave Chinner return error;
9619de7351SDave Chinner }
9719de7351SDave Chinner
9819de7351SDave Chinner int
xfs_readlink(struct xfs_inode * ip,char * link)9919de7351SDave Chinner xfs_readlink(
100f948dd76SDave Chinner struct xfs_inode *ip,
10119de7351SDave Chinner char *link)
10219de7351SDave Chinner {
103f948dd76SDave Chinner struct xfs_mount *mp = ip->i_mount;
10419de7351SDave Chinner xfs_fsize_t pathlen;
1057b7820b8SDarrick J. Wong int error = -EFSCORRUPTED;
10619de7351SDave Chinner
10719de7351SDave Chinner trace_xfs_readlink(ip);
10819de7351SDave Chinner
10975c8c50fSDave Chinner if (xfs_is_shutdown(mp))
1102451337dSDave Chinner return -EIO;
11119de7351SDave Chinner
11219de7351SDave Chinner xfs_ilock(ip, XFS_ILOCK_SHARED);
11319de7351SDave Chinner
11413d2c10bSChristoph Hellwig pathlen = ip->i_disk_size;
11519de7351SDave Chinner if (!pathlen)
11619de7351SDave Chinner goto out;
11719de7351SDave Chinner
1186eb0b8dfSDarrick J. Wong if (pathlen < 0 || pathlen > XFS_SYMLINK_MAXLEN) {
11919de7351SDave Chinner xfs_alert(mp, "%s: inode (%llu) bad symlink length (%lld)",
12019de7351SDave Chinner __func__, (unsigned long long) ip->i_ino,
12119de7351SDave Chinner (long long) pathlen);
12219de7351SDave Chinner ASSERT(0);
12319de7351SDave Chinner goto out;
12419de7351SDave Chinner }
12519de7351SDave Chinner
1267b7820b8SDarrick J. Wong if (ip->i_df.if_format == XFS_DINODE_FMT_LOCAL) {
1277b7820b8SDarrick J. Wong /*
1287b7820b8SDarrick J. Wong * The VFS crashes on a NULL pointer, so return -EFSCORRUPTED
1297b7820b8SDarrick J. Wong * if if_data is junk.
1307b7820b8SDarrick J. Wong */
1317b7820b8SDarrick J. Wong if (XFS_IS_CORRUPT(ip->i_mount, !ip->i_df.if_u1.if_data))
1327b7820b8SDarrick J. Wong goto out;
13319de7351SDave Chinner
1347b7820b8SDarrick J. Wong memcpy(link, ip->i_df.if_u1.if_data, pathlen + 1);
1357b7820b8SDarrick J. Wong error = 0;
1367b7820b8SDarrick J. Wong } else {
1375da8f2f8SDarrick J. Wong error = xfs_readlink_bmap_ilocked(ip, link);
1387b7820b8SDarrick J. Wong }
13919de7351SDave Chinner
14019de7351SDave Chinner out:
14119de7351SDave Chinner xfs_iunlock(ip, XFS_ILOCK_SHARED);
14219de7351SDave Chinner return error;
14319de7351SDave Chinner }
14419de7351SDave Chinner
14519de7351SDave Chinner int
xfs_symlink(struct mnt_idmap * idmap,struct xfs_inode * dp,struct xfs_name * link_name,const char * target_path,umode_t mode,struct xfs_inode ** ipp)14619de7351SDave Chinner xfs_symlink(
147f2d40141SChristian Brauner struct mnt_idmap *idmap,
148f948dd76SDave Chinner struct xfs_inode *dp,
14919de7351SDave Chinner struct xfs_name *link_name,
15019de7351SDave Chinner const char *target_path,
15119de7351SDave Chinner umode_t mode,
152f948dd76SDave Chinner struct xfs_inode **ipp)
15319de7351SDave Chinner {
154f948dd76SDave Chinner struct xfs_mount *mp = dp->i_mount;
155f948dd76SDave Chinner struct xfs_trans *tp = NULL;
156f948dd76SDave Chinner struct xfs_inode *ip = NULL;
157f948dd76SDave Chinner int error = 0;
15819de7351SDave Chinner int pathlen;
15919de7351SDave Chinner bool unlock_dp_on_error = false;
16019de7351SDave Chinner xfs_fileoff_t first_fsb;
16119de7351SDave Chinner xfs_filblks_t fs_blocks;
16219de7351SDave Chinner int nmaps;
163f948dd76SDave Chinner struct xfs_bmbt_irec mval[XFS_SYMLINK_MAPS];
16419de7351SDave Chinner xfs_daddr_t d;
16519de7351SDave Chinner const char *cur_chunk;
16619de7351SDave Chinner int byte_cnt;
16719de7351SDave Chinner int n;
168e8222613SDave Chinner struct xfs_buf *bp;
16919de7351SDave Chinner prid_t prid;
170113a5683SChandra Seetharaman struct xfs_dquot *udqp = NULL;
171113a5683SChandra Seetharaman struct xfs_dquot *gdqp = NULL;
17292f8ff73SChandra Seetharaman struct xfs_dquot *pdqp = NULL;
17319de7351SDave Chinner uint resblks;
174b652afd9SDave Chinner xfs_ino_t ino;
17519de7351SDave Chinner
17619de7351SDave Chinner *ipp = NULL;
17719de7351SDave Chinner
17819de7351SDave Chinner trace_xfs_symlink(dp, link_name);
17919de7351SDave Chinner
18075c8c50fSDave Chinner if (xfs_is_shutdown(mp))
1812451337dSDave Chinner return -EIO;
18219de7351SDave Chinner
18319de7351SDave Chinner /*
18419de7351SDave Chinner * Check component lengths of the target path name.
18519de7351SDave Chinner */
18619de7351SDave Chinner pathlen = strlen(target_path);
1876eb0b8dfSDarrick J. Wong if (pathlen >= XFS_SYMLINK_MAXLEN) /* total string too long */
1882451337dSDave Chinner return -ENAMETOOLONG;
18943feeea8SDave Chinner ASSERT(pathlen > 0);
19019de7351SDave Chinner
191163467d3SZhi Yong Wu prid = xfs_get_initial_prid(dp);
19219de7351SDave Chinner
19319de7351SDave Chinner /*
19419de7351SDave Chinner * Make sure that we have allocated dquot(s) on disk.
19519de7351SDave Chinner */
196*c14329d3SChristian Brauner error = xfs_qm_vop_dqalloc(dp, mapped_fsuid(idmap, &init_user_ns),
197*c14329d3SChristian Brauner mapped_fsgid(idmap, &init_user_ns), prid,
1987aab1b28SDwight Engen XFS_QMOPT_QUOTALL | XFS_QMOPT_INHERIT,
1997aab1b28SDwight Engen &udqp, &gdqp, &pdqp);
20019de7351SDave Chinner if (error)
20158c90473SDave Chinner return error;
20219de7351SDave Chinner
20319de7351SDave Chinner /*
20419de7351SDave Chinner * The symlink will fit into the inode data fork?
20519de7351SDave Chinner * There can't be any attributes so we get the whole variable part.
20619de7351SDave Chinner */
207e9e2eae8SChristoph Hellwig if (pathlen <= XFS_LITINO(mp))
20819de7351SDave Chinner fs_blocks = 0;
20919de7351SDave Chinner else
210321a9583SDave Chinner fs_blocks = xfs_symlink_blocks(mp, pathlen);
21119de7351SDave Chinner resblks = XFS_SYMLINK_SPACE_RES(mp, link_name->len, fs_blocks);
212253f4911SChristoph Hellwig
213f2f7b9ffSDarrick J. Wong error = xfs_trans_alloc_icreate(mp, &M_RES(mp)->tr_symlink, udqp, gdqp,
214f2f7b9ffSDarrick J. Wong pdqp, resblks, &tp);
2154906e215SChristoph Hellwig if (error)
216f2f7b9ffSDarrick J. Wong goto out_release_dquots;
21719de7351SDave Chinner
21865523218SChristoph Hellwig xfs_ilock(dp, XFS_ILOCK_EXCL | XFS_ILOCK_PARENT);
21919de7351SDave Chinner unlock_dp_on_error = true;
22019de7351SDave Chinner
22119de7351SDave Chinner /*
22219de7351SDave Chinner * Check whether the directory allows new symlinks or not.
22319de7351SDave Chinner */
224db07349dSChristoph Hellwig if (dp->i_diflags & XFS_DIFLAG_NOSYMLINKS) {
2252451337dSDave Chinner error = -EPERM;
22658c90473SDave Chinner goto out_trans_cancel;
22719de7351SDave Chinner }
22819de7351SDave Chinner
22919de7351SDave Chinner /*
23019de7351SDave Chinner * Allocate an inode for the symlink.
23119de7351SDave Chinner */
232b652afd9SDave Chinner error = xfs_dialloc(&tp, dp->i_ino, S_IFLNK, &ino);
233b652afd9SDave Chinner if (!error)
234f2d40141SChristian Brauner error = xfs_init_new_inode(idmap, tp, dp, ino,
235b652afd9SDave Chinner S_IFLNK | (mode & ~S_IFMT), 1, 0, prid,
236b652afd9SDave Chinner false, &ip);
23758c90473SDave Chinner if (error)
23858c90473SDave Chinner goto out_trans_cancel;
23919de7351SDave Chinner
24019de7351SDave Chinner /*
24158c90473SDave Chinner * Now we join the directory inode to the transaction. We do not do it
24258c90473SDave Chinner * earlier because xfs_dir_ialloc might commit the previous transaction
24358c90473SDave Chinner * (and release all the locks). An error from here on will result in
24458c90473SDave Chinner * the transaction cancel unlocking dp so don't do it explicitly in the
24519de7351SDave Chinner * error path.
24619de7351SDave Chinner */
24765523218SChristoph Hellwig xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL);
24819de7351SDave Chinner unlock_dp_on_error = false;
24919de7351SDave Chinner
25019de7351SDave Chinner /*
25119de7351SDave Chinner * Also attach the dquot(s) to it, if applicable.
25219de7351SDave Chinner */
25392f8ff73SChandra Seetharaman xfs_qm_vop_create_dqattach(tp, ip, udqp, gdqp, pdqp);
25419de7351SDave Chinner
25519de7351SDave Chinner resblks -= XFS_IALLOC_SPACE_RES(mp);
25619de7351SDave Chinner /*
25719de7351SDave Chinner * If the symlink will fit into the inode, write it inline.
25819de7351SDave Chinner */
259c01147d9SDarrick J. Wong if (pathlen <= xfs_inode_data_fork_size(ip)) {
260143f4aedSChristoph Hellwig xfs_init_local_fork(ip, XFS_DATA_FORK, target_path, pathlen);
261143f4aedSChristoph Hellwig
26213d2c10bSChristoph Hellwig ip->i_disk_size = pathlen;
263f7e67b20SChristoph Hellwig ip->i_df.if_format = XFS_DINODE_FMT_LOCAL;
26419de7351SDave Chinner xfs_trans_log_inode(tp, ip, XFS_ILOG_DDATA | XFS_ILOG_CORE);
26519de7351SDave Chinner } else {
266f948dd76SDave Chinner int offset;
267f948dd76SDave Chinner
26819de7351SDave Chinner first_fsb = 0;
26919de7351SDave Chinner nmaps = XFS_SYMLINK_MAPS;
27019de7351SDave Chinner
27119de7351SDave Chinner error = xfs_bmapi_write(tp, ip, first_fsb, fs_blocks,
272a7beabeaSBrian Foster XFS_BMAPI_METADATA, resblks, mval, &nmaps);
27319de7351SDave Chinner if (error)
274c8eac49eSBrian Foster goto out_trans_cancel;
27519de7351SDave Chinner
27619de7351SDave Chinner resblks -= fs_blocks;
27713d2c10bSChristoph Hellwig ip->i_disk_size = pathlen;
27819de7351SDave Chinner xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
27919de7351SDave Chinner
28019de7351SDave Chinner cur_chunk = target_path;
281f948dd76SDave Chinner offset = 0;
28219de7351SDave Chinner for (n = 0; n < nmaps; n++) {
283f948dd76SDave Chinner char *buf;
284f948dd76SDave Chinner
28519de7351SDave Chinner d = XFS_FSB_TO_DADDR(mp, mval[n].br_startblock);
28619de7351SDave Chinner byte_cnt = XFS_FSB_TO_B(mp, mval[n].br_blockcount);
287ce92464cSDarrick J. Wong error = xfs_trans_get_buf(tp, mp->m_ddev_targp, d,
288ce92464cSDarrick J. Wong BTOBB(byte_cnt), 0, &bp);
289ce92464cSDarrick J. Wong if (error)
290c8eac49eSBrian Foster goto out_trans_cancel;
291f948dd76SDave Chinner bp->b_ops = &xfs_symlink_buf_ops;
292f948dd76SDave Chinner
293f948dd76SDave Chinner byte_cnt = XFS_SYMLINK_BUF_SPACE(mp, byte_cnt);
294321a9583SDave Chinner byte_cnt = min(byte_cnt, pathlen);
29519de7351SDave Chinner
296f948dd76SDave Chinner buf = bp->b_addr;
297f948dd76SDave Chinner buf += xfs_symlink_hdr_set(mp, ip->i_ino, offset,
298f948dd76SDave Chinner byte_cnt, bp);
299f948dd76SDave Chinner
300f948dd76SDave Chinner memcpy(buf, cur_chunk, byte_cnt);
301f948dd76SDave Chinner
30219de7351SDave Chinner cur_chunk += byte_cnt;
303f948dd76SDave Chinner pathlen -= byte_cnt;
304f948dd76SDave Chinner offset += byte_cnt;
30519de7351SDave Chinner
306daf7b799SDave Chinner xfs_trans_buf_set_type(tp, bp, XFS_BLFT_SYMLINK_BUF);
307f948dd76SDave Chinner xfs_trans_log_buf(tp, bp, 0, (buf + byte_cnt - 1) -
308f948dd76SDave Chinner (char *)bp->b_addr);
30919de7351SDave Chinner }
310321a9583SDave Chinner ASSERT(pathlen == 0);
31119de7351SDave Chinner }
31213d2c10bSChristoph Hellwig i_size_write(VFS_I(ip), ip->i_disk_size);
31319de7351SDave Chinner
31419de7351SDave Chinner /*
31519de7351SDave Chinner * Create the directory entry for the symlink.
31619de7351SDave Chinner */
317381eee69SBrian Foster error = xfs_dir_createname(tp, dp, link_name, ip->i_ino, resblks);
31819de7351SDave Chinner if (error)
319c8eac49eSBrian Foster goto out_trans_cancel;
32019de7351SDave Chinner xfs_trans_ichgtime(tp, dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
32119de7351SDave Chinner xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
32219de7351SDave Chinner
32319de7351SDave Chinner /*
32419de7351SDave Chinner * If this is a synchronous mount, make sure that the
32519de7351SDave Chinner * symlink transaction goes to disk before returning to
32619de7351SDave Chinner * the user.
32719de7351SDave Chinner */
3280560f31aSDave Chinner if (xfs_has_wsync(mp) || xfs_has_dirsync(mp))
32919de7351SDave Chinner xfs_trans_set_sync(tp);
33019de7351SDave Chinner
33170393313SChristoph Hellwig error = xfs_trans_commit(tp);
33258c90473SDave Chinner if (error)
33358c90473SDave Chinner goto out_release_inode;
33458c90473SDave Chinner
33519de7351SDave Chinner xfs_qm_dqrele(udqp);
33619de7351SDave Chinner xfs_qm_dqrele(gdqp);
33792f8ff73SChandra Seetharaman xfs_qm_dqrele(pdqp);
33819de7351SDave Chinner
33919de7351SDave Chinner *ipp = ip;
34019de7351SDave Chinner return 0;
34119de7351SDave Chinner
34258c90473SDave Chinner out_trans_cancel:
3434906e215SChristoph Hellwig xfs_trans_cancel(tp);
34458c90473SDave Chinner out_release_inode:
34558c90473SDave Chinner /*
34658c90473SDave Chinner * Wait until after the current transaction is aborted to finish the
34758c90473SDave Chinner * setup of the inode and release the inode. This prevents recursive
34858c90473SDave Chinner * transactions and deadlocks from xfs_inactive.
34958c90473SDave Chinner */
35058c90473SDave Chinner if (ip) {
35158c90473SDave Chinner xfs_finish_inode_setup(ip);
35244a8736bSDarrick J. Wong xfs_irele(ip);
35358c90473SDave Chinner }
354f2f7b9ffSDarrick J. Wong out_release_dquots:
35519de7351SDave Chinner xfs_qm_dqrele(udqp);
35619de7351SDave Chinner xfs_qm_dqrele(gdqp);
35792f8ff73SChandra Seetharaman xfs_qm_dqrele(pdqp);
35819de7351SDave Chinner
35919de7351SDave Chinner if (unlock_dp_on_error)
36065523218SChristoph Hellwig xfs_iunlock(dp, XFS_ILOCK_EXCL);
36119de7351SDave Chinner return error;
36219de7351SDave Chinner }
36319de7351SDave Chinner
36419de7351SDave Chinner /*
36519de7351SDave Chinner * Free a symlink that has blocks associated with it.
36643feeea8SDave Chinner *
36743feeea8SDave Chinner * Note: zero length symlinks are not allowed to exist. When we set the size to
36843feeea8SDave Chinner * zero, also change it to a regular file so that it does not get written to
36943feeea8SDave Chinner * disk as a zero length symlink. The inode is on the unlinked list already, so
37043feeea8SDave Chinner * userspace cannot find this inode anymore, so this change is not user visible
37143feeea8SDave Chinner * but allows us to catch corrupt zero-length symlinks in the verifiers.
37219de7351SDave Chinner */
373725eb1ebSMark Tinguely STATIC int
xfs_inactive_symlink_rmt(struct xfs_inode * ip)37419de7351SDave Chinner xfs_inactive_symlink_rmt(
37536b21ddeSBrian Foster struct xfs_inode *ip)
37619de7351SDave Chinner {
377e8222613SDave Chinner struct xfs_buf *bp;
37819de7351SDave Chinner int done;
37919de7351SDave Chinner int error;
38019de7351SDave Chinner int i;
38119de7351SDave Chinner xfs_mount_t *mp;
38219de7351SDave Chinner xfs_bmbt_irec_t mval[XFS_SYMLINK_MAPS];
38319de7351SDave Chinner int nmaps;
38419de7351SDave Chinner int size;
38519de7351SDave Chinner xfs_trans_t *tp;
38619de7351SDave Chinner
38719de7351SDave Chinner mp = ip->i_mount;
388b2197a36SChristoph Hellwig ASSERT(!xfs_need_iread_extents(&ip->i_df));
38919de7351SDave Chinner /*
39019de7351SDave Chinner * We're freeing a symlink that has some
39119de7351SDave Chinner * blocks allocated to it. Free the
39219de7351SDave Chinner * blocks here. We know that we've got
39319de7351SDave Chinner * either 1 or 2 extents and that we can
39419de7351SDave Chinner * free them all in one bunmapi call.
39519de7351SDave Chinner */
396daf83964SChristoph Hellwig ASSERT(ip->i_df.if_nextents > 0 && ip->i_df.if_nextents <= 2);
39719de7351SDave Chinner
398253f4911SChristoph Hellwig error = xfs_trans_alloc(mp, &M_RES(mp)->tr_itruncate, 0, 0, 0, &tp);
399253f4911SChristoph Hellwig if (error)
40036b21ddeSBrian Foster return error;
40136b21ddeSBrian Foster
40236b21ddeSBrian Foster xfs_ilock(ip, XFS_ILOCK_EXCL);
40336b21ddeSBrian Foster xfs_trans_ijoin(tp, ip, 0);
40436b21ddeSBrian Foster
40519de7351SDave Chinner /*
40643feeea8SDave Chinner * Lock the inode, fix the size, turn it into a regular file and join it
40743feeea8SDave Chinner * to the transaction. Hold it so in the normal path, we still have it
40843feeea8SDave Chinner * locked for the second transaction. In the error paths we need it
40919de7351SDave Chinner * held so the cancel won't rele it, see below.
41019de7351SDave Chinner */
41113d2c10bSChristoph Hellwig size = (int)ip->i_disk_size;
41213d2c10bSChristoph Hellwig ip->i_disk_size = 0;
41343feeea8SDave Chinner VFS_I(ip)->i_mode = (VFS_I(ip)->i_mode & ~S_IFMT) | S_IFREG;
41419de7351SDave Chinner xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
41519de7351SDave Chinner /*
41619de7351SDave Chinner * Find the block(s) so we can inval and unmap them.
41719de7351SDave Chinner */
41819de7351SDave Chinner done = 0;
41919de7351SDave Chinner nmaps = ARRAY_SIZE(mval);
420f948dd76SDave Chinner error = xfs_bmapi_read(ip, 0, xfs_symlink_blocks(mp, size),
42119de7351SDave Chinner mval, &nmaps, 0);
42219de7351SDave Chinner if (error)
42336b21ddeSBrian Foster goto error_trans_cancel;
42419de7351SDave Chinner /*
425f948dd76SDave Chinner * Invalidate the block(s). No validation is done.
42619de7351SDave Chinner */
42719de7351SDave Chinner for (i = 0; i < nmaps; i++) {
428ce92464cSDarrick J. Wong error = xfs_trans_get_buf(tp, mp->m_ddev_targp,
42919de7351SDave Chinner XFS_FSB_TO_DADDR(mp, mval[i].br_startblock),
430ce92464cSDarrick J. Wong XFS_FSB_TO_BB(mp, mval[i].br_blockcount), 0,
431ce92464cSDarrick J. Wong &bp);
432ce92464cSDarrick J. Wong if (error)
433c8eac49eSBrian Foster goto error_trans_cancel;
43419de7351SDave Chinner xfs_trans_binval(tp, bp);
43519de7351SDave Chinner }
43619de7351SDave Chinner /*
4372c3234d1SDarrick J. Wong * Unmap the dead block(s) to the dfops.
43819de7351SDave Chinner */
4392af52842SBrian Foster error = xfs_bunmapi(tp, ip, 0, size, 0, nmaps, &done);
44036b21ddeSBrian Foster if (error)
441c8eac49eSBrian Foster goto error_trans_cancel;
44219de7351SDave Chinner ASSERT(done);
4433565b660SDave Chinner
44419de7351SDave Chinner /*
445c8eac49eSBrian Foster * Commit the transaction. This first logs the EFI and the inode, then
446c8eac49eSBrian Foster * rolls and commits the transaction that frees the extents.
44719de7351SDave Chinner */
4483565b660SDave Chinner xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
44970393313SChristoph Hellwig error = xfs_trans_commit(tp);
45019de7351SDave Chinner if (error) {
45175c8c50fSDave Chinner ASSERT(xfs_is_shutdown(mp));
45236b21ddeSBrian Foster goto error_unlock;
45319de7351SDave Chinner }
45419de7351SDave Chinner
45519de7351SDave Chinner /*
45619de7351SDave Chinner * Remove the memory for extent descriptions (just bookkeeping).
45719de7351SDave Chinner */
45819de7351SDave Chinner if (ip->i_df.if_bytes)
45919de7351SDave Chinner xfs_idata_realloc(ip, -ip->i_df.if_bytes, XFS_DATA_FORK);
46019de7351SDave Chinner ASSERT(ip->i_df.if_bytes == 0);
46119de7351SDave Chinner
46236b21ddeSBrian Foster xfs_iunlock(ip, XFS_ILOCK_EXCL);
46319de7351SDave Chinner return 0;
46419de7351SDave Chinner
46536b21ddeSBrian Foster error_trans_cancel:
4664906e215SChristoph Hellwig xfs_trans_cancel(tp);
46736b21ddeSBrian Foster error_unlock:
46836b21ddeSBrian Foster xfs_iunlock(ip, XFS_ILOCK_EXCL);
46919de7351SDave Chinner return error;
47019de7351SDave Chinner }
471725eb1ebSMark Tinguely
472725eb1ebSMark Tinguely /*
473725eb1ebSMark Tinguely * xfs_inactive_symlink - free a symlink
474725eb1ebSMark Tinguely */
475725eb1ebSMark Tinguely int
xfs_inactive_symlink(struct xfs_inode * ip)476725eb1ebSMark Tinguely xfs_inactive_symlink(
47736b21ddeSBrian Foster struct xfs_inode *ip)
478725eb1ebSMark Tinguely {
479725eb1ebSMark Tinguely struct xfs_mount *mp = ip->i_mount;
480725eb1ebSMark Tinguely int pathlen;
481725eb1ebSMark Tinguely
482725eb1ebSMark Tinguely trace_xfs_inactive_symlink(ip);
483725eb1ebSMark Tinguely
48475c8c50fSDave Chinner if (xfs_is_shutdown(mp))
4852451337dSDave Chinner return -EIO;
486725eb1ebSMark Tinguely
48736b21ddeSBrian Foster xfs_ilock(ip, XFS_ILOCK_EXCL);
48813d2c10bSChristoph Hellwig pathlen = (int)ip->i_disk_size;
48943feeea8SDave Chinner ASSERT(pathlen);
490725eb1ebSMark Tinguely
49143feeea8SDave Chinner if (pathlen <= 0 || pathlen > XFS_SYMLINK_MAXLEN) {
492725eb1ebSMark Tinguely xfs_alert(mp, "%s: inode (0x%llx) bad symlink length (%d)",
493725eb1ebSMark Tinguely __func__, (unsigned long long)ip->i_ino, pathlen);
49436b21ddeSBrian Foster xfs_iunlock(ip, XFS_ILOCK_EXCL);
495725eb1ebSMark Tinguely ASSERT(0);
4962451337dSDave Chinner return -EFSCORRUPTED;
497725eb1ebSMark Tinguely }
498725eb1ebSMark Tinguely
49943feeea8SDave Chinner /*
50043feeea8SDave Chinner * Inline fork state gets removed by xfs_difree() so we have nothing to
50143feeea8SDave Chinner * do here in that case.
50243feeea8SDave Chinner */
5030779f4a6SChristoph Hellwig if (ip->i_df.if_format == XFS_DINODE_FMT_LOCAL) {
50436b21ddeSBrian Foster xfs_iunlock(ip, XFS_ILOCK_EXCL);
505725eb1ebSMark Tinguely return 0;
506725eb1ebSMark Tinguely }
507725eb1ebSMark Tinguely
50836b21ddeSBrian Foster xfs_iunlock(ip, XFS_ILOCK_EXCL);
50936b21ddeSBrian Foster
510725eb1ebSMark Tinguely /* remove the remote symlink */
51136b21ddeSBrian Foster return xfs_inactive_symlink_rmt(ip);
512725eb1ebSMark Tinguely }
513