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 u64 *no_addr = opaque;
46 if (ip->i_no_addr == *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 u64 *no_addr = opaque;
58 inode->i_ino = (unsigned long)*no_addr;
59 ip->i_no_addr = *no_addr;
63 struct inode *gfs2_ilookup(struct super_block *sb, u64 no_addr)
65 unsigned long hash = (unsigned long)no_addr;
66 return ilookup5(sb, hash, iget_test, &no_addr);
69 static struct inode *gfs2_iget(struct super_block *sb, u64 no_addr)
71 unsigned long hash = (unsigned long)no_addr;
72 return iget5_locked(sb, hash, iget_test, iget_set, &no_addr);
76 * gfs2_inode_lookup - Lookup an inode
77 * @sb: The super block
78 * @no_addr: 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, u64 no_addr, unsigned int type)
86 struct inode *inode = gfs2_iget(sb, no_addr);
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, no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
116 ip->i_gl->gl_object = ip;
118 error = gfs2_glock_get(sdp, 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_no_addr != be64_to_cpu(str->di_num.no_addr)) {
148 if (gfs2_consist_inode(ip))
149 gfs2_dinode_print(ip);
152 ip->i_no_formal_ino = be64_to_cpu(str->di_num.no_formal_ino);
153 ip->i_inode.i_mode = be32_to_cpu(str->di_mode);
154 ip->i_inode.i_rdev = 0;
155 switch (ip->i_inode.i_mode & S_IFMT) {
158 ip->i_inode.i_rdev = MKDEV(be32_to_cpu(str->di_major),
159 be32_to_cpu(str->di_minor));
163 ip->i_inode.i_uid = be32_to_cpu(str->di_uid);
164 ip->i_inode.i_gid = be32_to_cpu(str->di_gid);
166 * We will need to review setting the nlink count here in the
167 * light of the forthcoming ro bind mount work. This is a reminder
170 ip->i_inode.i_nlink = be32_to_cpu(str->di_nlink);
171 di->di_size = be64_to_cpu(str->di_size);
172 i_size_write(&ip->i_inode, di->di_size);
173 di->di_blocks = be64_to_cpu(str->di_blocks);
174 gfs2_set_inode_blocks(&ip->i_inode);
175 ip->i_inode.i_atime.tv_sec = be64_to_cpu(str->di_atime);
176 ip->i_inode.i_atime.tv_nsec = 0;
177 ip->i_inode.i_mtime.tv_sec = be64_to_cpu(str->di_mtime);
178 ip->i_inode.i_mtime.tv_nsec = 0;
179 ip->i_inode.i_ctime.tv_sec = be64_to_cpu(str->di_ctime);
180 ip->i_inode.i_ctime.tv_nsec = 0;
182 di->di_goal_meta = be64_to_cpu(str->di_goal_meta);
183 di->di_goal_data = be64_to_cpu(str->di_goal_data);
184 di->di_generation = be64_to_cpu(str->di_generation);
186 di->di_flags = be32_to_cpu(str->di_flags);
187 gfs2_set_inode_flags(&ip->i_inode);
188 di->di_height = be16_to_cpu(str->di_height);
190 di->di_depth = be16_to_cpu(str->di_depth);
191 di->di_entries = be32_to_cpu(str->di_entries);
193 di->di_eattr = be64_to_cpu(str->di_eattr);
198 * gfs2_inode_refresh - Refresh the incore copy of the dinode
199 * @ip: The GFS2 inode
204 int gfs2_inode_refresh(struct gfs2_inode *ip)
206 struct buffer_head *dibh;
209 error = gfs2_meta_inode_buffer(ip, &dibh);
213 if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), dibh, GFS2_METATYPE_DI)) {
218 error = gfs2_dinode_in(ip, dibh->b_data);
220 clear_bit(GIF_INVALID, &ip->i_flags);
225 int gfs2_dinode_dealloc(struct gfs2_inode *ip)
227 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
228 struct gfs2_alloc *al;
229 struct gfs2_rgrpd *rgd;
232 if (ip->i_di.di_blocks != 1) {
233 if (gfs2_consist_inode(ip))
234 gfs2_dinode_print(ip);
238 al = gfs2_alloc_get(ip);
240 error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
244 error = gfs2_rindex_hold(sdp, &al->al_ri_gh);
248 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr);
250 gfs2_consist_inode(ip);
252 goto out_rindex_relse;
255 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0,
258 goto out_rindex_relse;
260 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA, 1);
264 gfs2_trans_add_gl(ip->i_gl);
266 gfs2_free_di(rgd, ip);
269 clear_bit(GLF_STICKY, &ip->i_gl->gl_flags);
272 gfs2_glock_dq_uninit(&al->al_rgd_gh);
274 gfs2_glock_dq_uninit(&al->al_ri_gh);
276 gfs2_quota_unhold(ip);
283 * gfs2_change_nlink - Change nlink count on inode
284 * @ip: The GFS2 inode
285 * @diff: The change in the nlink count required
289 int gfs2_change_nlink(struct gfs2_inode *ip, int diff)
291 struct buffer_head *dibh;
295 BUG_ON(diff != 1 && diff != -1);
296 nlink = ip->i_inode.i_nlink + diff;
298 /* If we are reducing the nlink count, but the new value ends up being
299 bigger than the old one, we must have underflowed. */
300 if (diff < 0 && nlink > ip->i_inode.i_nlink) {
301 if (gfs2_consist_inode(ip))
302 gfs2_dinode_print(ip);
306 error = gfs2_meta_inode_buffer(ip, &dibh);
311 inc_nlink(&ip->i_inode);
313 drop_nlink(&ip->i_inode);
315 ip->i_inode.i_ctime = CURRENT_TIME_SEC;
317 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
318 gfs2_dinode_out(ip, dibh->b_data);
320 mark_inode_dirty(&ip->i_inode);
322 if (ip->i_inode.i_nlink == 0)
323 gfs2_unlink_di(&ip->i_inode); /* mark inode unlinked */
328 struct inode *gfs2_lookup_simple(struct inode *dip, const char *name)
332 gfs2_str2qstr(&qstr, name);
333 inode = gfs2_lookupi(dip, &qstr, 1, NULL);
334 /* gfs2_lookupi has inconsistent callers: vfs
335 * related routines expect NULL for no entry found,
336 * gfs2_lookup_simple callers expect ENOENT
337 * and do not check for NULL.
340 return ERR_PTR(-ENOENT);
347 * gfs2_lookupi - Look up a filename in a directory and return its inode
348 * @d_gh: An initialized holder for the directory glock
349 * @name: The name of the inode to look for
350 * @is_root: If 1, ignore the caller's permissions
351 * @i_gh: An uninitialized holder for the new inode glock
353 * This can be called via the VFS filldir function when NFS is doing
354 * a readdirplus and the inode which its intending to stat isn't
355 * already in cache. In this case we must not take the directory glock
356 * again, since the readdir call will have already taken that lock.
361 struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
362 int is_root, struct nameidata *nd)
364 struct super_block *sb = dir->i_sb;
365 struct gfs2_inode *dip = GFS2_I(dir);
366 struct gfs2_holder d_gh;
368 struct inode *inode = NULL;
371 if (!name->len || name->len > GFS2_FNAMESIZE)
372 return ERR_PTR(-ENAMETOOLONG);
374 if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) ||
375 (name->len == 2 && memcmp(name->name, "..", 2) == 0 &&
376 dir == sb->s_root->d_inode)) {
381 if (gfs2_glock_is_locked_by_me(dip->i_gl) == 0) {
382 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
384 return ERR_PTR(error);
389 error = permission(dir, MAY_EXEC, NULL);
394 inode = gfs2_dir_search(dir, name);
396 error = PTR_ERR(inode);
399 gfs2_glock_dq_uninit(&d_gh);
400 if (error == -ENOENT)
402 return inode ? inode : ERR_PTR(error);
405 static int pick_formal_ino_1(struct gfs2_sbd *sdp, u64 *formal_ino)
407 struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode);
408 struct buffer_head *bh;
409 struct gfs2_inum_range_host ir;
412 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
415 mutex_lock(&sdp->sd_inum_mutex);
417 error = gfs2_meta_inode_buffer(ip, &bh);
419 mutex_unlock(&sdp->sd_inum_mutex);
424 gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode));
427 *formal_ino = ir.ir_start++;
429 gfs2_trans_add_bh(ip->i_gl, bh, 1);
430 gfs2_inum_range_out(&ir,
431 bh->b_data + sizeof(struct gfs2_dinode));
433 mutex_unlock(&sdp->sd_inum_mutex);
440 mutex_unlock(&sdp->sd_inum_mutex);
446 static int pick_formal_ino_2(struct gfs2_sbd *sdp, u64 *formal_ino)
448 struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode);
449 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_inum_inode);
450 struct gfs2_holder gh;
451 struct buffer_head *bh;
452 struct gfs2_inum_range_host ir;
455 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
459 error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0);
462 mutex_lock(&sdp->sd_inum_mutex);
464 error = gfs2_meta_inode_buffer(ip, &bh);
468 gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode));
471 struct buffer_head *m_bh;
475 error = gfs2_meta_inode_buffer(m_ip, &m_bh);
479 z = *(__be64 *)(m_bh->b_data + sizeof(struct gfs2_dinode));
480 x = y = be64_to_cpu(z);
482 ir.ir_length = GFS2_INUM_QUANTUM;
483 x += GFS2_INUM_QUANTUM;
485 gfs2_consist_inode(m_ip);
487 gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1);
488 *(__be64 *)(m_bh->b_data + sizeof(struct gfs2_dinode)) = z;
493 *formal_ino = ir.ir_start++;
496 gfs2_trans_add_bh(ip->i_gl, bh, 1);
497 gfs2_inum_range_out(&ir, bh->b_data + sizeof(struct gfs2_dinode));
502 mutex_unlock(&sdp->sd_inum_mutex);
505 gfs2_glock_dq_uninit(&gh);
509 static int pick_formal_ino(struct gfs2_sbd *sdp, u64 *inum)
513 error = pick_formal_ino_1(sdp, inum);
517 error = pick_formal_ino_2(sdp, inum);
523 * create_ok - OK to create a new on-disk inode here?
524 * @dip: Directory in which dinode is to be created
525 * @name: Name of new dinode
531 static int create_ok(struct gfs2_inode *dip, const struct qstr *name,
536 error = permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL);
540 /* Don't create entries in an unlinked directory */
541 if (!dip->i_inode.i_nlink)
544 error = gfs2_dir_check(&dip->i_inode, name, NULL);
555 if (dip->i_di.di_entries == (u32)-1)
557 if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1)
563 static void munge_mode_uid_gid(struct gfs2_inode *dip, unsigned int *mode,
564 unsigned int *uid, unsigned int *gid)
566 if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir &&
567 (dip->i_inode.i_mode & S_ISUID) && dip->i_inode.i_uid) {
570 else if (dip->i_inode.i_uid != current->fsuid)
572 *uid = dip->i_inode.i_uid;
574 *uid = current->fsuid;
576 if (dip->i_inode.i_mode & S_ISGID) {
579 *gid = dip->i_inode.i_gid;
581 *gid = current->fsgid;
584 static int alloc_dinode(struct gfs2_inode *dip, u64 *no_addr, u64 *generation)
586 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
591 dip->i_alloc.al_requested = RES_DINODE;
592 error = gfs2_inplace_reserve(dip);
596 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS, 0);
600 *no_addr = gfs2_alloc_di(dip, generation);
605 gfs2_inplace_release(dip);
612 * init_dinode - Fill in a new dinode structure
613 * @dip: the directory this inode is being created in
614 * @gl: The glock covering the new inode
615 * @inum: the inode number
616 * @mode: the file permissions
622 static void init_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
623 const struct gfs2_inum_host *inum, unsigned int mode,
624 unsigned int uid, unsigned int gid,
625 const u64 *generation, dev_t dev)
627 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
628 struct gfs2_dinode *di;
629 struct buffer_head *dibh;
631 dibh = gfs2_meta_new(gl, inum->no_addr);
632 gfs2_trans_add_bh(gl, dibh, 1);
633 gfs2_metatype_set(dibh, GFS2_METATYPE_DI, GFS2_FORMAT_DI);
634 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
635 di = (struct gfs2_dinode *)dibh->b_data;
637 di->di_num.no_formal_ino = cpu_to_be64(inum->no_formal_ino);
638 di->di_num.no_addr = cpu_to_be64(inum->no_addr);
639 di->di_mode = cpu_to_be32(mode);
640 di->di_uid = cpu_to_be32(uid);
641 di->di_gid = cpu_to_be32(gid);
644 di->di_blocks = cpu_to_be64(1);
645 di->di_atime = di->di_mtime = di->di_ctime = cpu_to_be64(get_seconds());
646 di->di_major = cpu_to_be32(MAJOR(dev));
647 di->di_minor = cpu_to_be32(MINOR(dev));
648 di->di_goal_meta = di->di_goal_data = cpu_to_be64(inum->no_addr);
649 di->di_generation = cpu_to_be64(*generation);
653 if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_JDATA) ||
654 gfs2_tune_get(sdp, gt_new_files_jdata))
655 di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA);
656 if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_DIRECTIO) ||
657 gfs2_tune_get(sdp, gt_new_files_directio))
658 di->di_flags |= cpu_to_be32(GFS2_DIF_DIRECTIO);
659 } else if (S_ISDIR(mode)) {
660 di->di_flags |= cpu_to_be32(dip->i_di.di_flags &
661 GFS2_DIF_INHERIT_DIRECTIO);
662 di->di_flags |= cpu_to_be32(dip->i_di.di_flags &
663 GFS2_DIF_INHERIT_JDATA);
667 di->di_payload_format = cpu_to_be32(S_ISDIR(mode) ? GFS2_FORMAT_DE : 0);
673 memset(&di->__pad4, 0, sizeof(di->__pad4));
675 memset(&di->di_reserved, 0, sizeof(di->di_reserved));
680 static int make_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
681 unsigned int mode, const struct gfs2_inum_host *inum,
682 const u64 *generation, dev_t dev)
684 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
685 unsigned int uid, gid;
688 munge_mode_uid_gid(dip, &mode, &uid, &gid);
691 error = gfs2_quota_lock(dip, uid, gid);
695 error = gfs2_quota_check(dip, uid, gid);
699 error = gfs2_trans_begin(sdp, RES_DINODE + RES_QUOTA, 0);
703 init_dinode(dip, gl, inum, mode, uid, gid, generation, dev);
704 gfs2_quota_change(dip, +1, uid, gid);
708 gfs2_quota_unlock(dip);
714 static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
715 struct gfs2_inode *ip)
717 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
718 struct gfs2_alloc *al;
720 struct buffer_head *dibh;
723 al = gfs2_alloc_get(dip);
725 error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
729 error = alloc_required = gfs2_diradd_alloc_required(&dip->i_inode, name);
730 if (alloc_required < 0)
732 if (alloc_required) {
733 error = gfs2_quota_check(dip, dip->i_inode.i_uid, dip->i_inode.i_gid);
735 goto fail_quota_locks;
737 al->al_requested = sdp->sd_max_dirres;
739 error = gfs2_inplace_reserve(dip);
741 goto fail_quota_locks;
743 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
744 al->al_rgd->rd_ri.ri_length +
746 RES_STATFS + RES_QUOTA, 0);
750 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
752 goto fail_quota_locks;
755 error = gfs2_dir_add(&dip->i_inode, name, ip, IF2DT(ip->i_inode.i_mode));
759 error = gfs2_meta_inode_buffer(ip, &dibh);
762 ip->i_inode.i_nlink = 1;
763 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
764 gfs2_dinode_out(ip, dibh->b_data);
772 if (dip->i_alloc.al_rgd)
773 gfs2_inplace_release(dip);
776 gfs2_quota_unlock(dip);
783 static int gfs2_security_init(struct gfs2_inode *dip, struct gfs2_inode *ip)
789 struct gfs2_ea_request er;
791 err = security_inode_init_security(&ip->i_inode, &dip->i_inode,
792 &name, &value, &len);
795 if (err == -EOPNOTSUPP)
800 memset(&er, 0, sizeof(struct gfs2_ea_request));
802 er.er_type = GFS2_EATYPE_SECURITY;
805 er.er_name_len = strlen(name);
806 er.er_data_len = len;
808 err = gfs2_ea_set_i(ip, &er);
817 * gfs2_createi - Create a new inode
818 * @ghs: An array of two holders
819 * @name: The name of the new file
820 * @mode: the permissions on the new inode
822 * @ghs[0] is an initialized holder for the directory
823 * @ghs[1] is the holder for the inode lock
825 * If the return value is not NULL, the glocks on both the directory and the new
826 * file are held. A transaction has been started and an inplace reservation
832 struct inode *gfs2_createi(struct gfs2_holder *ghs, const struct qstr *name,
833 unsigned int mode, dev_t dev)
836 struct gfs2_inode *dip = ghs->gh_gl->gl_object;
837 struct inode *dir = &dip->i_inode;
838 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
839 struct gfs2_inum_host inum = { .no_addr = 0, .no_formal_ino = 0 };
843 if (!name->len || name->len > GFS2_FNAMESIZE)
844 return ERR_PTR(-ENAMETOOLONG);
846 gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs);
847 error = gfs2_glock_nq(ghs);
851 error = create_ok(dip, name, mode);
855 error = pick_formal_ino(sdp, &inum.no_formal_ino);
859 error = alloc_dinode(dip, &inum.no_addr, &generation);
863 error = gfs2_glock_nq_num(sdp, inum.no_addr, &gfs2_inode_glops,
864 LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1);
868 error = make_dinode(dip, ghs[1].gh_gl, mode, &inum, &generation, dev);
872 inode = gfs2_inode_lookup(dir->i_sb, inum.no_addr, IF2DT(mode));
876 error = gfs2_inode_refresh(GFS2_I(inode));
880 error = gfs2_acl_create(dip, GFS2_I(inode));
884 error = gfs2_security_init(dip, GFS2_I(inode));
888 error = link_dinode(dip, name, GFS2_I(inode));
893 return ERR_PTR(-ENOMEM);
899 gfs2_glock_dq_uninit(ghs + 1);
903 return ERR_PTR(error);
907 * gfs2_rmdiri - Remove a directory
908 * @dip: The parent directory of the directory to be removed
909 * @name: The name of the directory to be removed
910 * @ip: The GFS2 inode of the directory to be removed
912 * Assumes Glocks on dip and ip are held
917 int gfs2_rmdiri(struct gfs2_inode *dip, const struct qstr *name,
918 struct gfs2_inode *ip)
923 if (ip->i_di.di_entries != 2) {
924 if (gfs2_consist_inode(ip))
925 gfs2_dinode_print(ip);
929 error = gfs2_dir_del(dip, name);
933 error = gfs2_change_nlink(dip, -1);
937 gfs2_str2qstr(&dotname, ".");
938 error = gfs2_dir_del(ip, &dotname);
942 gfs2_str2qstr(&dotname, "..");
943 error = gfs2_dir_del(ip, &dotname);
947 /* It looks odd, but it really should be done twice */
948 error = gfs2_change_nlink(ip, -1);
952 error = gfs2_change_nlink(ip, -1);
960 * gfs2_unlink_ok - check to see that a inode is still in a directory
961 * @dip: the directory
962 * @name: the name of the file
965 * Assumes that the lock on (at least) @dip is held.
967 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
970 int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
971 const struct gfs2_inode *ip)
975 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
978 if ((dip->i_inode.i_mode & S_ISVTX) &&
979 dip->i_inode.i_uid != current->fsuid &&
980 ip->i_inode.i_uid != current->fsuid && !capable(CAP_FOWNER))
983 if (IS_APPEND(&dip->i_inode))
986 error = permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL);
990 error = gfs2_dir_check(&dip->i_inode, name, ip);
998 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1002 * Follow @to back to the root and make sure we don't encounter @this
1003 * Assumes we already hold the rename lock.
1008 int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1010 struct inode *dir = &to->i_inode;
1011 struct super_block *sb = dir->i_sb;
1016 gfs2_str2qstr(&dotdot, "..");
1021 if (dir == &this->i_inode) {
1025 if (dir == sb->s_root->d_inode) {
1030 tmp = gfs2_lookupi(dir, &dotdot, 1, NULL);
1032 error = PTR_ERR(tmp);
1046 * gfs2_readlinki - return the contents of a symlink
1047 * @ip: the symlink's inode
1048 * @buf: a pointer to the buffer to be filled
1049 * @len: a pointer to the length of @buf
1051 * If @buf is too small, a piece of memory is kmalloc()ed and needs
1052 * to be freed by the caller.
1057 int gfs2_readlinki(struct gfs2_inode *ip, char **buf, unsigned int *len)
1059 struct gfs2_holder i_gh;
1060 struct buffer_head *dibh;
1064 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &i_gh);
1065 error = gfs2_glock_nq_atime(&i_gh);
1067 gfs2_holder_uninit(&i_gh);
1071 if (!ip->i_di.di_size) {
1072 gfs2_consist_inode(ip);
1077 error = gfs2_meta_inode_buffer(ip, &dibh);
1081 x = ip->i_di.di_size + 1;
1083 *buf = kmalloc(x, GFP_KERNEL);
1090 memcpy(*buf, dibh->b_data + sizeof(struct gfs2_dinode), x);
1096 gfs2_glock_dq_uninit(&i_gh);
1101 * gfs2_glock_nq_atime - Acquire a hold on an inode's glock, and
1102 * conditionally update the inode's atime
1103 * @gh: the holder to acquire
1105 * Tests atime (access time) for gfs2_read, gfs2_readdir and gfs2_mmap
1106 * Update if the difference between the current time and the inode's current
1107 * atime is greater than an interval specified at mount.
1112 int gfs2_glock_nq_atime(struct gfs2_holder *gh)
1114 struct gfs2_glock *gl = gh->gh_gl;
1115 struct gfs2_sbd *sdp = gl->gl_sbd;
1116 struct gfs2_inode *ip = gl->gl_object;
1117 s64 curtime, quantum = gfs2_tune_get(sdp, gt_atime_quantum);
1122 if (gfs2_assert_warn(sdp, gh->gh_flags & GL_ATIME) ||
1123 gfs2_assert_warn(sdp, !(gh->gh_flags & GL_ASYNC)) ||
1124 gfs2_assert_warn(sdp, gl->gl_ops == &gfs2_inode_glops))
1127 state = gh->gh_state;
1128 flags = gh->gh_flags;
1130 error = gfs2_glock_nq(gh);
1134 if (test_bit(SDF_NOATIME, &sdp->sd_flags) ||
1135 (sdp->sd_vfs->s_flags & MS_RDONLY))
1138 curtime = get_seconds();
1139 if (curtime - ip->i_inode.i_atime.tv_sec >= quantum) {
1141 gfs2_holder_reinit(LM_ST_EXCLUSIVE, gh->gh_flags & ~LM_FLAG_ANY,
1143 error = gfs2_glock_nq(gh);
1147 /* Verify that atime hasn't been updated while we were
1148 trying to get exclusive lock. */
1150 curtime = get_seconds();
1151 if (curtime - ip->i_inode.i_atime.tv_sec >= quantum) {
1152 struct buffer_head *dibh;
1153 struct gfs2_dinode *di;
1155 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
1156 if (error == -EROFS)
1161 error = gfs2_meta_inode_buffer(ip, &dibh);
1163 goto fail_end_trans;
1165 ip->i_inode.i_atime.tv_sec = curtime;
1167 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1168 di = (struct gfs2_dinode *)dibh->b_data;
1169 di->di_atime = cpu_to_be64(ip->i_inode.i_atime.tv_sec);
1172 gfs2_trans_end(sdp);
1175 /* If someone else has asked for the glock,
1176 unlock and let them have it. Then reacquire
1177 in the original state. */
1178 if (gfs2_glock_is_blocking(gl)) {
1180 gfs2_holder_reinit(state, flags, gh);
1181 return gfs2_glock_nq(gh);
1188 gfs2_trans_end(sdp);
1195 __gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr)
1197 struct buffer_head *dibh;
1200 error = gfs2_meta_inode_buffer(ip, &dibh);
1202 error = inode_setattr(&ip->i_inode, attr);
1203 gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error);
1204 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1205 gfs2_dinode_out(ip, dibh->b_data);
1212 * gfs2_setattr_simple -
1216 * Called with a reference on the vnode.
1221 int gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr)
1225 if (current->journal_info)
1226 return __gfs2_setattr_simple(ip, attr);
1228 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE, 0);
1232 error = __gfs2_setattr_simple(ip, attr);
1233 gfs2_trans_end(GFS2_SB(&ip->i_inode));