2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
5 * This copyrighted material is made available to anyone wishing to use,
6 * modify, copy, or redistribute it subject to the terms and conditions
7 * of the GNU General Public License version 2.
10 #include <linux/sched.h>
11 #include <linux/slab.h>
12 #include <linux/spinlock.h>
13 #include <linux/completion.h>
14 #include <linux/buffer_head.h>
15 #include <linux/posix_acl.h>
16 #include <linux/sort.h>
17 #include <linux/gfs2_ondisk.h>
18 #include <linux/crc32.h>
19 #include <linux/lm_interface.h>
20 #include <linux/security.h>
33 #include "ops_address.h"
35 #include "ops_inode.h"
41 static int iget_test(struct inode *inode, void *opaque)
43 struct gfs2_inode *ip = GFS2_I(inode);
44 struct gfs2_inum_host *inum = opaque;
46 if (ip->i_num.no_addr == inum->no_addr &&
47 inode->i_private != NULL)
53 static int iget_set(struct inode *inode, void *opaque)
55 struct gfs2_inode *ip = GFS2_I(inode);
56 struct gfs2_inum_host *inum = opaque;
59 inode->i_ino = inum->no_addr;
63 struct inode *gfs2_ilookup(struct super_block *sb, struct gfs2_inum_host *inum)
65 return ilookup5(sb, (unsigned long)inum->no_addr,
69 static struct inode *gfs2_iget(struct super_block *sb, struct gfs2_inum_host *inum)
71 return iget5_locked(sb, (unsigned long)inum->no_addr,
72 iget_test, iget_set, inum);
76 * gfs2_inode_lookup - Lookup an inode
77 * @sb: The super block
78 * @inum: The inode number
79 * @type: The type of the inode
81 * Returns: A VFS inode, or an error
84 struct inode *gfs2_inode_lookup(struct super_block *sb, struct gfs2_inum_host *inum, unsigned int type)
86 struct inode *inode = gfs2_iget(sb, inum);
87 struct gfs2_inode *ip = GFS2_I(inode);
88 struct gfs2_glock *io_gl;
92 return ERR_PTR(-ENOBUFS);
94 if (inode->i_state & I_NEW) {
95 struct gfs2_sbd *sdp = GFS2_SB(inode);
96 umode_t mode = DT2IF(type);
97 inode->i_private = ip;
101 inode->i_op = &gfs2_file_iops;
102 inode->i_fop = &gfs2_file_fops;
103 inode->i_mapping->a_ops = &gfs2_file_aops;
104 } else if (S_ISDIR(mode)) {
105 inode->i_op = &gfs2_dir_iops;
106 inode->i_fop = &gfs2_dir_fops;
107 } else if (S_ISLNK(mode)) {
108 inode->i_op = &gfs2_symlink_iops;
110 inode->i_op = &gfs2_dev_iops;
113 error = gfs2_glock_get(sdp, inum->no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
116 ip->i_gl->gl_object = ip;
118 error = gfs2_glock_get(sdp, inum->no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
122 set_bit(GIF_INVALID, &ip->i_flags);
123 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
127 gfs2_glock_put(io_gl);
128 unlock_new_inode(inode);
133 gfs2_glock_put(io_gl);
135 ip->i_gl->gl_object = NULL;
136 gfs2_glock_put(ip->i_gl);
139 return ERR_PTR(error);
142 static int gfs2_dinode_in(struct gfs2_inode *ip, const void *buf)
144 struct gfs2_dinode_host *di = &ip->i_di;
145 const struct gfs2_dinode *str = buf;
147 if (ip->i_num.no_addr != be64_to_cpu(str->di_num.no_addr)) {
148 if (gfs2_consist_inode(ip))
149 gfs2_dinode_print(ip);
152 if (ip->i_num.no_formal_ino != be64_to_cpu(str->di_num.no_formal_ino))
155 ip->i_inode.i_mode = be32_to_cpu(str->di_mode);
156 ip->i_inode.i_rdev = 0;
157 switch (ip->i_inode.i_mode & S_IFMT) {
160 ip->i_inode.i_rdev = MKDEV(be32_to_cpu(str->di_major),
161 be32_to_cpu(str->di_minor));
165 ip->i_inode.i_uid = be32_to_cpu(str->di_uid);
166 ip->i_inode.i_gid = be32_to_cpu(str->di_gid);
168 * We will need to review setting the nlink count here in the
169 * light of the forthcoming ro bind mount work. This is a reminder
172 ip->i_inode.i_nlink = be32_to_cpu(str->di_nlink);
173 di->di_size = be64_to_cpu(str->di_size);
174 i_size_write(&ip->i_inode, di->di_size);
175 di->di_blocks = be64_to_cpu(str->di_blocks);
176 gfs2_set_inode_blocks(&ip->i_inode);
177 ip->i_inode.i_atime.tv_sec = be64_to_cpu(str->di_atime);
178 ip->i_inode.i_atime.tv_nsec = 0;
179 ip->i_inode.i_mtime.tv_sec = be64_to_cpu(str->di_mtime);
180 ip->i_inode.i_mtime.tv_nsec = 0;
181 ip->i_inode.i_ctime.tv_sec = be64_to_cpu(str->di_ctime);
182 ip->i_inode.i_ctime.tv_nsec = 0;
184 di->di_goal_meta = be64_to_cpu(str->di_goal_meta);
185 di->di_goal_data = be64_to_cpu(str->di_goal_data);
186 di->di_generation = be64_to_cpu(str->di_generation);
188 di->di_flags = be32_to_cpu(str->di_flags);
189 gfs2_set_inode_flags(&ip->i_inode);
190 di->di_height = be16_to_cpu(str->di_height);
192 di->di_depth = be16_to_cpu(str->di_depth);
193 di->di_entries = be32_to_cpu(str->di_entries);
195 di->di_eattr = be64_to_cpu(str->di_eattr);
200 * gfs2_inode_refresh - Refresh the incore copy of the dinode
201 * @ip: The GFS2 inode
206 int gfs2_inode_refresh(struct gfs2_inode *ip)
208 struct buffer_head *dibh;
211 error = gfs2_meta_inode_buffer(ip, &dibh);
215 if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), dibh, GFS2_METATYPE_DI)) {
220 error = gfs2_dinode_in(ip, dibh->b_data);
222 clear_bit(GIF_INVALID, &ip->i_flags);
227 int gfs2_dinode_dealloc(struct gfs2_inode *ip)
229 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
230 struct gfs2_alloc *al;
231 struct gfs2_rgrpd *rgd;
234 if (ip->i_di.di_blocks != 1) {
235 if (gfs2_consist_inode(ip))
236 gfs2_dinode_print(ip);
240 al = gfs2_alloc_get(ip);
242 error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
246 error = gfs2_rindex_hold(sdp, &al->al_ri_gh);
250 rgd = gfs2_blk2rgrpd(sdp, ip->i_num.no_addr);
252 gfs2_consist_inode(ip);
254 goto out_rindex_relse;
257 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0,
260 goto out_rindex_relse;
262 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA, 1);
266 gfs2_trans_add_gl(ip->i_gl);
268 gfs2_free_di(rgd, ip);
271 clear_bit(GLF_STICKY, &ip->i_gl->gl_flags);
274 gfs2_glock_dq_uninit(&al->al_rgd_gh);
276 gfs2_glock_dq_uninit(&al->al_ri_gh);
278 gfs2_quota_unhold(ip);
285 * gfs2_change_nlink - Change nlink count on inode
286 * @ip: The GFS2 inode
287 * @diff: The change in the nlink count required
291 int gfs2_change_nlink(struct gfs2_inode *ip, int diff)
293 struct buffer_head *dibh;
297 BUG_ON(diff != 1 && diff != -1);
298 nlink = ip->i_inode.i_nlink + diff;
300 /* If we are reducing the nlink count, but the new value ends up being
301 bigger than the old one, we must have underflowed. */
302 if (diff < 0 && nlink > ip->i_inode.i_nlink) {
303 if (gfs2_consist_inode(ip))
304 gfs2_dinode_print(ip);
308 error = gfs2_meta_inode_buffer(ip, &dibh);
313 inc_nlink(&ip->i_inode);
315 drop_nlink(&ip->i_inode);
317 ip->i_inode.i_ctime = CURRENT_TIME_SEC;
319 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
320 gfs2_dinode_out(ip, dibh->b_data);
322 mark_inode_dirty(&ip->i_inode);
324 if (ip->i_inode.i_nlink == 0)
325 gfs2_unlink_di(&ip->i_inode); /* mark inode unlinked */
330 struct inode *gfs2_lookup_simple(struct inode *dip, const char *name)
334 gfs2_str2qstr(&qstr, name);
335 inode = gfs2_lookupi(dip, &qstr, 1, NULL);
336 /* gfs2_lookupi has inconsistent callers: vfs
337 * related routines expect NULL for no entry found,
338 * gfs2_lookup_simple callers expect ENOENT
339 * and do not check for NULL.
342 return ERR_PTR(-ENOENT);
349 * gfs2_lookupi - Look up a filename in a directory and return its inode
350 * @d_gh: An initialized holder for the directory glock
351 * @name: The name of the inode to look for
352 * @is_root: If 1, ignore the caller's permissions
353 * @i_gh: An uninitialized holder for the new inode glock
355 * This can be called via the VFS filldir function when NFS is doing
356 * a readdirplus and the inode which its intending to stat isn't
357 * already in cache. In this case we must not take the directory glock
358 * again, since the readdir call will have already taken that lock.
363 struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
364 int is_root, struct nameidata *nd)
366 struct super_block *sb = dir->i_sb;
367 struct gfs2_inode *dip = GFS2_I(dir);
368 struct gfs2_holder d_gh;
369 struct gfs2_inum_host inum;
372 struct inode *inode = NULL;
375 if (!name->len || name->len > GFS2_FNAMESIZE)
376 return ERR_PTR(-ENAMETOOLONG);
378 if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) ||
379 (name->len == 2 && memcmp(name->name, "..", 2) == 0 &&
380 dir == sb->s_root->d_inode)) {
385 if (gfs2_glock_is_locked_by_me(dip->i_gl) == 0) {
386 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
388 return ERR_PTR(error);
393 error = permission(dir, MAY_EXEC, NULL);
398 error = gfs2_dir_search(dir, name, &inum, &type);
402 inode = gfs2_inode_lookup(sb, &inum, type);
406 gfs2_glock_dq_uninit(&d_gh);
407 if (error == -ENOENT)
409 return inode ? inode : ERR_PTR(error);
412 static int pick_formal_ino_1(struct gfs2_sbd *sdp, u64 *formal_ino)
414 struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode);
415 struct buffer_head *bh;
416 struct gfs2_inum_range_host ir;
419 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
422 mutex_lock(&sdp->sd_inum_mutex);
424 error = gfs2_meta_inode_buffer(ip, &bh);
426 mutex_unlock(&sdp->sd_inum_mutex);
431 gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode));
434 *formal_ino = ir.ir_start++;
436 gfs2_trans_add_bh(ip->i_gl, bh, 1);
437 gfs2_inum_range_out(&ir,
438 bh->b_data + sizeof(struct gfs2_dinode));
440 mutex_unlock(&sdp->sd_inum_mutex);
447 mutex_unlock(&sdp->sd_inum_mutex);
453 static int pick_formal_ino_2(struct gfs2_sbd *sdp, u64 *formal_ino)
455 struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode);
456 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_inum_inode);
457 struct gfs2_holder gh;
458 struct buffer_head *bh;
459 struct gfs2_inum_range_host ir;
462 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
466 error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0);
469 mutex_lock(&sdp->sd_inum_mutex);
471 error = gfs2_meta_inode_buffer(ip, &bh);
475 gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode));
478 struct buffer_head *m_bh;
482 error = gfs2_meta_inode_buffer(m_ip, &m_bh);
486 z = *(__be64 *)(m_bh->b_data + sizeof(struct gfs2_dinode));
487 x = y = be64_to_cpu(z);
489 ir.ir_length = GFS2_INUM_QUANTUM;
490 x += GFS2_INUM_QUANTUM;
492 gfs2_consist_inode(m_ip);
494 gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1);
495 *(__be64 *)(m_bh->b_data + sizeof(struct gfs2_dinode)) = z;
500 *formal_ino = ir.ir_start++;
503 gfs2_trans_add_bh(ip->i_gl, bh, 1);
504 gfs2_inum_range_out(&ir, bh->b_data + sizeof(struct gfs2_dinode));
509 mutex_unlock(&sdp->sd_inum_mutex);
512 gfs2_glock_dq_uninit(&gh);
516 static int pick_formal_ino(struct gfs2_sbd *sdp, u64 *inum)
520 error = pick_formal_ino_1(sdp, inum);
524 error = pick_formal_ino_2(sdp, inum);
530 * create_ok - OK to create a new on-disk inode here?
531 * @dip: Directory in which dinode is to be created
532 * @name: Name of new dinode
538 static int create_ok(struct gfs2_inode *dip, const struct qstr *name,
543 error = permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL);
547 /* Don't create entries in an unlinked directory */
548 if (!dip->i_inode.i_nlink)
551 error = gfs2_dir_search(&dip->i_inode, name, NULL, NULL);
562 if (dip->i_di.di_entries == (u32)-1)
564 if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1)
570 static void munge_mode_uid_gid(struct gfs2_inode *dip, unsigned int *mode,
571 unsigned int *uid, unsigned int *gid)
573 if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir &&
574 (dip->i_inode.i_mode & S_ISUID) && dip->i_inode.i_uid) {
577 else if (dip->i_inode.i_uid != current->fsuid)
579 *uid = dip->i_inode.i_uid;
581 *uid = current->fsuid;
583 if (dip->i_inode.i_mode & S_ISGID) {
586 *gid = dip->i_inode.i_gid;
588 *gid = current->fsgid;
591 static int alloc_dinode(struct gfs2_inode *dip, struct gfs2_inum_host *inum,
594 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
599 dip->i_alloc.al_requested = RES_DINODE;
600 error = gfs2_inplace_reserve(dip);
604 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS, 0);
608 inum->no_addr = gfs2_alloc_di(dip, generation);
613 gfs2_inplace_release(dip);
620 * init_dinode - Fill in a new dinode structure
621 * @dip: the directory this inode is being created in
622 * @gl: The glock covering the new inode
623 * @inum: the inode number
624 * @mode: the file permissions
630 static void init_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
631 const struct gfs2_inum_host *inum, unsigned int mode,
632 unsigned int uid, unsigned int gid,
633 const u64 *generation, dev_t dev)
635 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
636 struct gfs2_dinode *di;
637 struct buffer_head *dibh;
639 dibh = gfs2_meta_new(gl, inum->no_addr);
640 gfs2_trans_add_bh(gl, dibh, 1);
641 gfs2_metatype_set(dibh, GFS2_METATYPE_DI, GFS2_FORMAT_DI);
642 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
643 di = (struct gfs2_dinode *)dibh->b_data;
645 di->di_num.no_formal_ino = cpu_to_be64(inum->no_formal_ino);
646 di->di_num.no_addr = cpu_to_be64(inum->no_addr);
647 di->di_mode = cpu_to_be32(mode);
648 di->di_uid = cpu_to_be32(uid);
649 di->di_gid = cpu_to_be32(gid);
652 di->di_blocks = cpu_to_be64(1);
653 di->di_atime = di->di_mtime = di->di_ctime = cpu_to_be64(get_seconds());
654 di->di_major = cpu_to_be32(MAJOR(dev));
655 di->di_minor = cpu_to_be32(MINOR(dev));
656 di->di_goal_meta = di->di_goal_data = cpu_to_be64(inum->no_addr);
657 di->di_generation = cpu_to_be64(*generation);
661 if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_JDATA) ||
662 gfs2_tune_get(sdp, gt_new_files_jdata))
663 di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA);
664 if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_DIRECTIO) ||
665 gfs2_tune_get(sdp, gt_new_files_directio))
666 di->di_flags |= cpu_to_be32(GFS2_DIF_DIRECTIO);
667 } else if (S_ISDIR(mode)) {
668 di->di_flags |= cpu_to_be32(dip->i_di.di_flags &
669 GFS2_DIF_INHERIT_DIRECTIO);
670 di->di_flags |= cpu_to_be32(dip->i_di.di_flags &
671 GFS2_DIF_INHERIT_JDATA);
675 di->di_payload_format = cpu_to_be32(S_ISDIR(mode) ? GFS2_FORMAT_DE : 0);
681 memset(&di->__pad4, 0, sizeof(di->__pad4));
683 memset(&di->di_reserved, 0, sizeof(di->di_reserved));
688 static int make_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
689 unsigned int mode, const struct gfs2_inum_host *inum,
690 const u64 *generation, dev_t dev)
692 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
693 unsigned int uid, gid;
696 munge_mode_uid_gid(dip, &mode, &uid, &gid);
699 error = gfs2_quota_lock(dip, uid, gid);
703 error = gfs2_quota_check(dip, uid, gid);
707 error = gfs2_trans_begin(sdp, RES_DINODE + RES_QUOTA, 0);
711 init_dinode(dip, gl, inum, mode, uid, gid, generation, dev);
712 gfs2_quota_change(dip, +1, uid, gid);
716 gfs2_quota_unlock(dip);
722 static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
723 struct gfs2_inode *ip)
725 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
726 struct gfs2_alloc *al;
728 struct buffer_head *dibh;
731 al = gfs2_alloc_get(dip);
733 error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
737 error = alloc_required = gfs2_diradd_alloc_required(&dip->i_inode, name);
738 if (alloc_required < 0)
740 if (alloc_required) {
741 error = gfs2_quota_check(dip, dip->i_inode.i_uid, dip->i_inode.i_gid);
743 goto fail_quota_locks;
745 al->al_requested = sdp->sd_max_dirres;
747 error = gfs2_inplace_reserve(dip);
749 goto fail_quota_locks;
751 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
752 al->al_rgd->rd_ri.ri_length +
754 RES_STATFS + RES_QUOTA, 0);
758 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
760 goto fail_quota_locks;
763 error = gfs2_dir_add(&dip->i_inode, name, &ip->i_num, IF2DT(ip->i_inode.i_mode));
767 error = gfs2_meta_inode_buffer(ip, &dibh);
770 ip->i_inode.i_nlink = 1;
771 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
772 gfs2_dinode_out(ip, dibh->b_data);
780 if (dip->i_alloc.al_rgd)
781 gfs2_inplace_release(dip);
784 gfs2_quota_unlock(dip);
791 static int gfs2_security_init(struct gfs2_inode *dip, struct gfs2_inode *ip)
797 struct gfs2_ea_request er;
799 err = security_inode_init_security(&ip->i_inode, &dip->i_inode,
800 &name, &value, &len);
803 if (err == -EOPNOTSUPP)
808 memset(&er, 0, sizeof(struct gfs2_ea_request));
810 er.er_type = GFS2_EATYPE_SECURITY;
813 er.er_name_len = strlen(name);
814 er.er_data_len = len;
816 err = gfs2_ea_set_i(ip, &er);
825 * gfs2_createi - Create a new inode
826 * @ghs: An array of two holders
827 * @name: The name of the new file
828 * @mode: the permissions on the new inode
830 * @ghs[0] is an initialized holder for the directory
831 * @ghs[1] is the holder for the inode lock
833 * If the return value is not NULL, the glocks on both the directory and the new
834 * file are held. A transaction has been started and an inplace reservation
840 struct inode *gfs2_createi(struct gfs2_holder *ghs, const struct qstr *name,
841 unsigned int mode, dev_t dev)
844 struct gfs2_inode *dip = ghs->gh_gl->gl_object;
845 struct inode *dir = &dip->i_inode;
846 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
847 struct gfs2_inum_host inum;
851 if (!name->len || name->len > GFS2_FNAMESIZE)
852 return ERR_PTR(-ENAMETOOLONG);
854 gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs);
855 error = gfs2_glock_nq(ghs);
859 error = create_ok(dip, name, mode);
863 error = pick_formal_ino(sdp, &inum.no_formal_ino);
867 error = alloc_dinode(dip, &inum, &generation);
871 error = gfs2_glock_nq_num(sdp, inum.no_addr, &gfs2_inode_glops,
872 LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1);
876 error = make_dinode(dip, ghs[1].gh_gl, mode, &inum, &generation, dev);
880 inode = gfs2_inode_lookup(dir->i_sb, &inum, IF2DT(mode));
884 error = gfs2_inode_refresh(GFS2_I(inode));
888 error = gfs2_acl_create(dip, GFS2_I(inode));
892 error = gfs2_security_init(dip, GFS2_I(inode));
896 error = link_dinode(dip, name, GFS2_I(inode));
901 return ERR_PTR(-ENOMEM);
907 gfs2_glock_dq_uninit(ghs + 1);
911 return ERR_PTR(error);
915 * gfs2_rmdiri - Remove a directory
916 * @dip: The parent directory of the directory to be removed
917 * @name: The name of the directory to be removed
918 * @ip: The GFS2 inode of the directory to be removed
920 * Assumes Glocks on dip and ip are held
925 int gfs2_rmdiri(struct gfs2_inode *dip, const struct qstr *name,
926 struct gfs2_inode *ip)
931 if (ip->i_di.di_entries != 2) {
932 if (gfs2_consist_inode(ip))
933 gfs2_dinode_print(ip);
937 error = gfs2_dir_del(dip, name);
941 error = gfs2_change_nlink(dip, -1);
945 gfs2_str2qstr(&dotname, ".");
946 error = gfs2_dir_del(ip, &dotname);
950 gfs2_str2qstr(&dotname, "..");
951 error = gfs2_dir_del(ip, &dotname);
955 /* It looks odd, but it really should be done twice */
956 error = gfs2_change_nlink(ip, -1);
960 error = gfs2_change_nlink(ip, -1);
968 * gfs2_unlink_ok - check to see that a inode is still in a directory
969 * @dip: the directory
970 * @name: the name of the file
973 * Assumes that the lock on (at least) @dip is held.
975 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
978 int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
979 struct gfs2_inode *ip)
981 struct gfs2_inum_host inum;
985 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
988 if ((dip->i_inode.i_mode & S_ISVTX) &&
989 dip->i_inode.i_uid != current->fsuid &&
990 ip->i_inode.i_uid != current->fsuid && !capable(CAP_FOWNER))
993 if (IS_APPEND(&dip->i_inode))
996 error = permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL);
1000 error = gfs2_dir_search(&dip->i_inode, name, &inum, &type);
1004 if (!gfs2_inum_equal(&inum, &ip->i_num))
1007 if (IF2DT(ip->i_inode.i_mode) != type) {
1008 gfs2_consist_inode(dip);
1016 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1020 * Follow @to back to the root and make sure we don't encounter @this
1021 * Assumes we already hold the rename lock.
1026 int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1028 struct inode *dir = &to->i_inode;
1029 struct super_block *sb = dir->i_sb;
1034 gfs2_str2qstr(&dotdot, "..");
1039 if (dir == &this->i_inode) {
1043 if (dir == sb->s_root->d_inode) {
1048 tmp = gfs2_lookupi(dir, &dotdot, 1, NULL);
1050 error = PTR_ERR(tmp);
1064 * gfs2_readlinki - return the contents of a symlink
1065 * @ip: the symlink's inode
1066 * @buf: a pointer to the buffer to be filled
1067 * @len: a pointer to the length of @buf
1069 * If @buf is too small, a piece of memory is kmalloc()ed and needs
1070 * to be freed by the caller.
1075 int gfs2_readlinki(struct gfs2_inode *ip, char **buf, unsigned int *len)
1077 struct gfs2_holder i_gh;
1078 struct buffer_head *dibh;
1082 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &i_gh);
1083 error = gfs2_glock_nq_atime(&i_gh);
1085 gfs2_holder_uninit(&i_gh);
1089 if (!ip->i_di.di_size) {
1090 gfs2_consist_inode(ip);
1095 error = gfs2_meta_inode_buffer(ip, &dibh);
1099 x = ip->i_di.di_size + 1;
1101 *buf = kmalloc(x, GFP_KERNEL);
1108 memcpy(*buf, dibh->b_data + sizeof(struct gfs2_dinode), x);
1114 gfs2_glock_dq_uninit(&i_gh);
1119 * gfs2_glock_nq_atime - Acquire a hold on an inode's glock, and
1120 * conditionally update the inode's atime
1121 * @gh: the holder to acquire
1123 * Tests atime (access time) for gfs2_read, gfs2_readdir and gfs2_mmap
1124 * Update if the difference between the current time and the inode's current
1125 * atime is greater than an interval specified at mount.
1130 int gfs2_glock_nq_atime(struct gfs2_holder *gh)
1132 struct gfs2_glock *gl = gh->gh_gl;
1133 struct gfs2_sbd *sdp = gl->gl_sbd;
1134 struct gfs2_inode *ip = gl->gl_object;
1135 s64 curtime, quantum = gfs2_tune_get(sdp, gt_atime_quantum);
1140 if (gfs2_assert_warn(sdp, gh->gh_flags & GL_ATIME) ||
1141 gfs2_assert_warn(sdp, !(gh->gh_flags & GL_ASYNC)) ||
1142 gfs2_assert_warn(sdp, gl->gl_ops == &gfs2_inode_glops))
1145 state = gh->gh_state;
1146 flags = gh->gh_flags;
1148 error = gfs2_glock_nq(gh);
1152 if (test_bit(SDF_NOATIME, &sdp->sd_flags) ||
1153 (sdp->sd_vfs->s_flags & MS_RDONLY))
1156 curtime = get_seconds();
1157 if (curtime - ip->i_inode.i_atime.tv_sec >= quantum) {
1159 gfs2_holder_reinit(LM_ST_EXCLUSIVE, gh->gh_flags & ~LM_FLAG_ANY,
1161 error = gfs2_glock_nq(gh);
1165 /* Verify that atime hasn't been updated while we were
1166 trying to get exclusive lock. */
1168 curtime = get_seconds();
1169 if (curtime - ip->i_inode.i_atime.tv_sec >= quantum) {
1170 struct buffer_head *dibh;
1171 struct gfs2_dinode *di;
1173 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
1174 if (error == -EROFS)
1179 error = gfs2_meta_inode_buffer(ip, &dibh);
1181 goto fail_end_trans;
1183 ip->i_inode.i_atime.tv_sec = curtime;
1185 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1186 di = (struct gfs2_dinode *)dibh->b_data;
1187 di->di_atime = cpu_to_be64(ip->i_inode.i_atime.tv_sec);
1190 gfs2_trans_end(sdp);
1193 /* If someone else has asked for the glock,
1194 unlock and let them have it. Then reacquire
1195 in the original state. */
1196 if (gfs2_glock_is_blocking(gl)) {
1198 gfs2_holder_reinit(state, flags, gh);
1199 return gfs2_glock_nq(gh);
1206 gfs2_trans_end(sdp);
1213 __gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr)
1215 struct buffer_head *dibh;
1218 error = gfs2_meta_inode_buffer(ip, &dibh);
1220 error = inode_setattr(&ip->i_inode, attr);
1221 gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error);
1222 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1223 gfs2_dinode_out(ip, dibh->b_data);
1230 * gfs2_setattr_simple -
1234 * Called with a reference on the vnode.
1239 int gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr)
1243 if (current->journal_info)
1244 return __gfs2_setattr_simple(ip, attr);
1246 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE, 0);
1250 error = __gfs2_setattr_simple(ip, attr);
1251 gfs2_trans_end(GFS2_SB(&ip->i_inode));