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"
42 * gfs2_inode_attr_in - Copy attributes from the dinode into the VFS inode
43 * @ip: The GFS2 inode (with embedded disk inode data)
44 * @inode: The Linux VFS inode
48 void gfs2_inode_attr_in(struct gfs2_inode *ip)
50 struct inode *inode = &ip->i_inode;
51 struct gfs2_dinode_host *di = &ip->i_di;
53 inode->i_ino = ip->i_num.no_addr;
54 inode->i_mode = di->di_mode;
55 inode->i_nlink = di->di_nlink;
56 inode->i_uid = di->di_uid;
57 inode->i_gid = di->di_gid;
58 i_size_write(inode, di->di_size);
59 inode->i_atime.tv_sec = di->di_atime;
60 inode->i_mtime.tv_sec = di->di_mtime;
61 inode->i_ctime.tv_sec = di->di_ctime;
62 inode->i_atime.tv_nsec = 0;
63 inode->i_mtime.tv_nsec = 0;
64 inode->i_ctime.tv_nsec = 0;
65 inode->i_blocks = di->di_blocks <<
66 (GFS2_SB(inode)->sd_sb.sb_bsize_shift - GFS2_BASIC_BLOCK_SHIFT);
68 if (di->di_flags & GFS2_DIF_IMMUTABLE)
69 inode->i_flags |= S_IMMUTABLE;
71 inode->i_flags &= ~S_IMMUTABLE;
73 if (di->di_flags & GFS2_DIF_APPENDONLY)
74 inode->i_flags |= S_APPEND;
76 inode->i_flags &= ~S_APPEND;
80 * gfs2_inode_attr_out - Copy attributes from VFS inode into the dinode
83 * Only copy out the attributes that we want the VFS layer
84 * to be able to modify.
87 void gfs2_inode_attr_out(struct gfs2_inode *ip)
89 struct inode *inode = &ip->i_inode;
90 struct gfs2_dinode_host *di = &ip->i_di;
91 gfs2_assert_withdraw(GFS2_SB(inode),
92 (di->di_mode & S_IFMT) == (inode->i_mode & S_IFMT));
93 di->di_mode = inode->i_mode;
94 di->di_uid = inode->i_uid;
95 di->di_gid = inode->i_gid;
96 di->di_atime = inode->i_atime.tv_sec;
97 di->di_mtime = inode->i_mtime.tv_sec;
98 di->di_ctime = inode->i_ctime.tv_sec;
101 static int iget_test(struct inode *inode, void *opaque)
103 struct gfs2_inode *ip = GFS2_I(inode);
104 struct gfs2_inum_host *inum = opaque;
106 if (ip && ip->i_num.no_addr == inum->no_addr)
112 static int iget_set(struct inode *inode, void *opaque)
114 struct gfs2_inode *ip = GFS2_I(inode);
115 struct gfs2_inum_host *inum = opaque;
121 struct inode *gfs2_ilookup(struct super_block *sb, struct gfs2_inum_host *inum)
123 return ilookup5(sb, (unsigned long)inum->no_formal_ino,
127 static struct inode *gfs2_iget(struct super_block *sb, struct gfs2_inum_host *inum)
129 return iget5_locked(sb, (unsigned long)inum->no_formal_ino,
130 iget_test, iget_set, inum);
134 * gfs2_inode_lookup - Lookup an inode
135 * @sb: The super block
136 * @inum: The inode number
137 * @type: The type of the inode
139 * Returns: A VFS inode, or an error
142 struct inode *gfs2_inode_lookup(struct super_block *sb, struct gfs2_inum_host *inum, unsigned int type)
144 struct inode *inode = gfs2_iget(sb, inum);
145 struct gfs2_inode *ip = GFS2_I(inode);
146 struct gfs2_glock *io_gl;
150 return ERR_PTR(-ENOBUFS);
152 if (inode->i_state & I_NEW) {
153 struct gfs2_sbd *sdp = GFS2_SB(inode);
154 umode_t mode = DT2IF(type);
155 inode->i_private = ip;
156 inode->i_mode = mode;
159 inode->i_op = &gfs2_file_iops;
160 inode->i_fop = &gfs2_file_fops;
161 inode->i_mapping->a_ops = &gfs2_file_aops;
162 } else if (S_ISDIR(mode)) {
163 inode->i_op = &gfs2_dir_iops;
164 inode->i_fop = &gfs2_dir_fops;
165 } else if (S_ISLNK(mode)) {
166 inode->i_op = &gfs2_symlink_iops;
168 inode->i_op = &gfs2_dev_iops;
171 error = gfs2_glock_get(sdp, inum->no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
174 ip->i_gl->gl_object = ip;
176 error = gfs2_glock_get(sdp, inum->no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
180 ip->i_vn = ip->i_gl->gl_vn - 1;
181 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
185 gfs2_glock_put(io_gl);
186 unlock_new_inode(inode);
191 gfs2_glock_put(io_gl);
193 ip->i_gl->gl_object = NULL;
194 gfs2_glock_put(ip->i_gl);
197 return ERR_PTR(error);
200 static int gfs2_dinode_in(struct gfs2_inode *ip, const void *buf)
202 struct gfs2_dinode_host *di = &ip->i_di;
203 const struct gfs2_dinode *str = buf;
205 if (ip->i_num.no_addr != be64_to_cpu(str->di_num.no_addr)) {
206 if (gfs2_consist_inode(ip))
207 gfs2_dinode_print(ip);
210 if (ip->i_num.no_formal_ino != be64_to_cpu(str->di_num.no_formal_ino))
213 di->di_mode = be32_to_cpu(str->di_mode);
214 ip->i_inode.i_rdev = 0;
215 switch (di->di_mode & S_IFMT) {
218 ip->i_inode.i_rdev = MKDEV(be32_to_cpu(str->di_major),
219 be32_to_cpu(str->di_minor));
223 di->di_uid = be32_to_cpu(str->di_uid);
224 di->di_gid = be32_to_cpu(str->di_gid);
225 di->di_nlink = be32_to_cpu(str->di_nlink);
226 di->di_size = be64_to_cpu(str->di_size);
227 di->di_blocks = be64_to_cpu(str->di_blocks);
228 di->di_atime = be64_to_cpu(str->di_atime);
229 di->di_mtime = be64_to_cpu(str->di_mtime);
230 di->di_ctime = be64_to_cpu(str->di_ctime);
232 di->di_goal_meta = be64_to_cpu(str->di_goal_meta);
233 di->di_goal_data = be64_to_cpu(str->di_goal_data);
234 di->di_generation = be64_to_cpu(str->di_generation);
236 di->di_flags = be32_to_cpu(str->di_flags);
237 di->di_payload_format = be32_to_cpu(str->di_payload_format);
238 di->di_height = be16_to_cpu(str->di_height);
240 di->di_depth = be16_to_cpu(str->di_depth);
241 di->di_entries = be32_to_cpu(str->di_entries);
243 di->di_eattr = be64_to_cpu(str->di_eattr);
248 * gfs2_inode_refresh - Refresh the incore copy of the dinode
249 * @ip: The GFS2 inode
254 int gfs2_inode_refresh(struct gfs2_inode *ip)
256 struct buffer_head *dibh;
259 error = gfs2_meta_inode_buffer(ip, &dibh);
263 if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), dibh, GFS2_METATYPE_DI)) {
268 error = gfs2_dinode_in(ip, dibh->b_data);
270 ip->i_vn = ip->i_gl->gl_vn;
275 int gfs2_dinode_dealloc(struct gfs2_inode *ip)
277 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
278 struct gfs2_alloc *al;
279 struct gfs2_rgrpd *rgd;
282 if (ip->i_di.di_blocks != 1) {
283 if (gfs2_consist_inode(ip))
284 gfs2_dinode_print(ip);
288 al = gfs2_alloc_get(ip);
290 error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
294 error = gfs2_rindex_hold(sdp, &al->al_ri_gh);
298 rgd = gfs2_blk2rgrpd(sdp, ip->i_num.no_addr);
300 gfs2_consist_inode(ip);
302 goto out_rindex_relse;
305 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0,
308 goto out_rindex_relse;
310 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA, 1);
314 gfs2_trans_add_gl(ip->i_gl);
316 gfs2_free_di(rgd, ip);
319 clear_bit(GLF_STICKY, &ip->i_gl->gl_flags);
322 gfs2_glock_dq_uninit(&al->al_rgd_gh);
324 gfs2_glock_dq_uninit(&al->al_ri_gh);
326 gfs2_quota_unhold(ip);
333 * gfs2_change_nlink - Change nlink count on inode
334 * @ip: The GFS2 inode
335 * @diff: The change in the nlink count required
340 int gfs2_change_nlink(struct gfs2_inode *ip, int diff)
342 struct gfs2_sbd *sdp = ip->i_inode.i_sb->s_fs_info;
343 struct buffer_head *dibh;
347 BUG_ON(ip->i_di.di_nlink != ip->i_inode.i_nlink);
348 nlink = ip->i_di.di_nlink + diff;
350 /* If we are reducing the nlink count, but the new value ends up being
351 bigger than the old one, we must have underflowed. */
352 if (diff < 0 && nlink > ip->i_di.di_nlink) {
353 if (gfs2_consist_inode(ip))
354 gfs2_dinode_print(ip);
358 error = gfs2_meta_inode_buffer(ip, &dibh);
362 ip->i_di.di_nlink = nlink;
363 ip->i_di.di_ctime = get_seconds();
364 ip->i_inode.i_nlink = nlink;
366 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
367 gfs2_dinode_out(ip, dibh->b_data);
369 mark_inode_dirty(&ip->i_inode);
371 if (ip->i_di.di_nlink == 0) {
372 struct gfs2_rgrpd *rgd;
373 struct gfs2_holder ri_gh, rg_gh;
375 error = gfs2_rindex_hold(sdp, &ri_gh);
379 rgd = gfs2_blk2rgrpd(sdp, ip->i_num.no_addr);
382 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &rg_gh);
386 clear_nlink(&ip->i_inode);
387 gfs2_unlink_di(&ip->i_inode); /* mark inode unlinked */
388 gfs2_glock_dq_uninit(&rg_gh);
390 gfs2_glock_dq_uninit(&ri_gh);
396 struct inode *gfs2_lookup_simple(struct inode *dip, const char *name)
399 gfs2_str2qstr(&qstr, name);
400 return gfs2_lookupi(dip, &qstr, 1, NULL);
405 * gfs2_lookupi - Look up a filename in a directory and return its inode
406 * @d_gh: An initialized holder for the directory glock
407 * @name: The name of the inode to look for
408 * @is_root: If 1, ignore the caller's permissions
409 * @i_gh: An uninitialized holder for the new inode glock
411 * There will always be a vnode (Linux VFS inode) for the d_gh inode unless
417 struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
418 int is_root, struct nameidata *nd)
420 struct super_block *sb = dir->i_sb;
421 struct gfs2_inode *dip = GFS2_I(dir);
422 struct gfs2_holder d_gh;
423 struct gfs2_inum_host inum;
426 struct inode *inode = NULL;
428 if (!name->len || name->len > GFS2_FNAMESIZE)
429 return ERR_PTR(-ENAMETOOLONG);
431 if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) ||
432 (name->len == 2 && memcmp(name->name, "..", 2) == 0 &&
433 dir == sb->s_root->d_inode)) {
438 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
440 return ERR_PTR(error);
443 error = permission(dir, MAY_EXEC, NULL);
448 error = gfs2_dir_search(dir, name, &inum, &type);
452 inode = gfs2_inode_lookup(sb, &inum, type);
455 gfs2_glock_dq_uninit(&d_gh);
456 if (error == -ENOENT)
461 static int pick_formal_ino_1(struct gfs2_sbd *sdp, u64 *formal_ino)
463 struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode);
464 struct buffer_head *bh;
465 struct gfs2_inum_range_host ir;
468 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
471 mutex_lock(&sdp->sd_inum_mutex);
473 error = gfs2_meta_inode_buffer(ip, &bh);
475 mutex_unlock(&sdp->sd_inum_mutex);
480 gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode));
483 *formal_ino = ir.ir_start++;
485 gfs2_trans_add_bh(ip->i_gl, bh, 1);
486 gfs2_inum_range_out(&ir,
487 bh->b_data + sizeof(struct gfs2_dinode));
489 mutex_unlock(&sdp->sd_inum_mutex);
496 mutex_unlock(&sdp->sd_inum_mutex);
502 static int pick_formal_ino_2(struct gfs2_sbd *sdp, u64 *formal_ino)
504 struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode);
505 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_inum_inode);
506 struct gfs2_holder gh;
507 struct buffer_head *bh;
508 struct gfs2_inum_range_host ir;
511 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
515 error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0);
518 mutex_lock(&sdp->sd_inum_mutex);
520 error = gfs2_meta_inode_buffer(ip, &bh);
524 gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode));
527 struct buffer_head *m_bh;
531 error = gfs2_meta_inode_buffer(m_ip, &m_bh);
535 z = *(__be64 *)(m_bh->b_data + sizeof(struct gfs2_dinode));
536 x = y = be64_to_cpu(z);
538 ir.ir_length = GFS2_INUM_QUANTUM;
539 x += GFS2_INUM_QUANTUM;
541 gfs2_consist_inode(m_ip);
543 gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1);
544 *(__be64 *)(m_bh->b_data + sizeof(struct gfs2_dinode)) = z;
549 *formal_ino = ir.ir_start++;
552 gfs2_trans_add_bh(ip->i_gl, bh, 1);
553 gfs2_inum_range_out(&ir, bh->b_data + sizeof(struct gfs2_dinode));
558 mutex_unlock(&sdp->sd_inum_mutex);
561 gfs2_glock_dq_uninit(&gh);
565 static int pick_formal_ino(struct gfs2_sbd *sdp, u64 *inum)
569 error = pick_formal_ino_1(sdp, inum);
573 error = pick_formal_ino_2(sdp, inum);
579 * create_ok - OK to create a new on-disk inode here?
580 * @dip: Directory in which dinode is to be created
581 * @name: Name of new dinode
587 static int create_ok(struct gfs2_inode *dip, const struct qstr *name,
592 error = permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL);
596 /* Don't create entries in an unlinked directory */
597 if (!dip->i_di.di_nlink)
600 error = gfs2_dir_search(&dip->i_inode, name, NULL, NULL);
611 if (dip->i_di.di_entries == (u32)-1)
613 if (S_ISDIR(mode) && dip->i_di.di_nlink == (u32)-1)
619 static void munge_mode_uid_gid(struct gfs2_inode *dip, unsigned int *mode,
620 unsigned int *uid, unsigned int *gid)
622 if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir &&
623 (dip->i_di.di_mode & S_ISUID) && dip->i_di.di_uid) {
626 else if (dip->i_di.di_uid != current->fsuid)
628 *uid = dip->i_di.di_uid;
630 *uid = current->fsuid;
632 if (dip->i_di.di_mode & S_ISGID) {
635 *gid = dip->i_di.di_gid;
637 *gid = current->fsgid;
640 static int alloc_dinode(struct gfs2_inode *dip, struct gfs2_inum_host *inum,
643 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
648 dip->i_alloc.al_requested = RES_DINODE;
649 error = gfs2_inplace_reserve(dip);
653 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS, 0);
657 inum->no_addr = gfs2_alloc_di(dip, generation);
662 gfs2_inplace_release(dip);
669 * init_dinode - Fill in a new dinode structure
670 * @dip: the directory this inode is being created in
671 * @gl: The glock covering the new inode
672 * @inum: the inode number
673 * @mode: the file permissions
679 static void init_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
680 const struct gfs2_inum_host *inum, unsigned int mode,
681 unsigned int uid, unsigned int gid,
682 const u64 *generation, dev_t dev)
684 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
685 struct gfs2_dinode *di;
686 struct buffer_head *dibh;
688 dibh = gfs2_meta_new(gl, inum->no_addr);
689 gfs2_trans_add_bh(gl, dibh, 1);
690 gfs2_metatype_set(dibh, GFS2_METATYPE_DI, GFS2_FORMAT_DI);
691 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
692 di = (struct gfs2_dinode *)dibh->b_data;
694 di->di_num.no_formal_ino = cpu_to_be64(inum->no_formal_ino);
695 di->di_num.no_addr = cpu_to_be64(inum->no_addr);
696 di->di_mode = cpu_to_be32(mode);
697 di->di_uid = cpu_to_be32(uid);
698 di->di_gid = cpu_to_be32(gid);
699 di->di_nlink = cpu_to_be32(0);
700 di->di_size = cpu_to_be64(0);
701 di->di_blocks = cpu_to_be64(1);
702 di->di_atime = di->di_mtime = di->di_ctime = cpu_to_be64(get_seconds());
703 di->di_major = cpu_to_be32(MAJOR(dev));
704 di->di_minor = cpu_to_be32(MINOR(dev));
705 di->di_goal_meta = di->di_goal_data = cpu_to_be64(inum->no_addr);
706 di->di_generation = cpu_to_be64(*generation);
707 di->di_flags = cpu_to_be32(0);
710 if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_JDATA) ||
711 gfs2_tune_get(sdp, gt_new_files_jdata))
712 di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA);
713 if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_DIRECTIO) ||
714 gfs2_tune_get(sdp, gt_new_files_directio))
715 di->di_flags |= cpu_to_be32(GFS2_DIF_DIRECTIO);
716 } else if (S_ISDIR(mode)) {
717 di->di_flags |= cpu_to_be32(dip->i_di.di_flags &
718 GFS2_DIF_INHERIT_DIRECTIO);
719 di->di_flags |= cpu_to_be32(dip->i_di.di_flags &
720 GFS2_DIF_INHERIT_JDATA);
724 di->di_payload_format = cpu_to_be32(0);
725 di->di_height = cpu_to_be32(0);
728 di->di_depth = cpu_to_be16(0);
729 di->di_entries = cpu_to_be32(0);
730 memset(&di->__pad4, 0, sizeof(di->__pad4));
731 di->di_eattr = cpu_to_be64(0);
732 memset(&di->di_reserved, 0, sizeof(di->di_reserved));
737 static int make_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
738 unsigned int mode, const struct gfs2_inum_host *inum,
739 const u64 *generation, dev_t dev)
741 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
742 unsigned int uid, gid;
745 munge_mode_uid_gid(dip, &mode, &uid, &gid);
748 error = gfs2_quota_lock(dip, uid, gid);
752 error = gfs2_quota_check(dip, uid, gid);
756 error = gfs2_trans_begin(sdp, RES_DINODE + RES_QUOTA, 0);
760 init_dinode(dip, gl, inum, mode, uid, gid, generation, dev);
761 gfs2_quota_change(dip, +1, uid, gid);
765 gfs2_quota_unlock(dip);
771 static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
772 struct gfs2_inode *ip)
774 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
775 struct gfs2_alloc *al;
777 struct buffer_head *dibh;
780 al = gfs2_alloc_get(dip);
782 error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
786 error = alloc_required = gfs2_diradd_alloc_required(&dip->i_inode, name);
787 if (alloc_required < 0)
789 if (alloc_required) {
790 error = gfs2_quota_check(dip, dip->i_di.di_uid,
793 goto fail_quota_locks;
795 al->al_requested = sdp->sd_max_dirres;
797 error = gfs2_inplace_reserve(dip);
799 goto fail_quota_locks;
801 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
802 al->al_rgd->rd_ri.ri_length +
804 RES_STATFS + RES_QUOTA, 0);
808 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
810 goto fail_quota_locks;
813 error = gfs2_dir_add(&dip->i_inode, name, &ip->i_num, IF2DT(ip->i_di.di_mode));
817 error = gfs2_meta_inode_buffer(ip, &dibh);
820 ip->i_di.di_nlink = 1;
821 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
822 gfs2_dinode_out(ip, dibh->b_data);
830 if (dip->i_alloc.al_rgd)
831 gfs2_inplace_release(dip);
834 gfs2_quota_unlock(dip);
841 static int gfs2_security_init(struct gfs2_inode *dip, struct gfs2_inode *ip)
847 struct gfs2_ea_request er;
849 err = security_inode_init_security(&ip->i_inode, &dip->i_inode,
850 &name, &value, &len);
853 if (err == -EOPNOTSUPP)
858 memset(&er, 0, sizeof(struct gfs2_ea_request));
860 er.er_type = GFS2_EATYPE_SECURITY;
863 er.er_name_len = strlen(name);
864 er.er_data_len = len;
866 err = gfs2_ea_set_i(ip, &er);
875 * gfs2_createi - Create a new inode
876 * @ghs: An array of two holders
877 * @name: The name of the new file
878 * @mode: the permissions on the new inode
880 * @ghs[0] is an initialized holder for the directory
881 * @ghs[1] is the holder for the inode lock
883 * If the return value is not NULL, the glocks on both the directory and the new
884 * file are held. A transaction has been started and an inplace reservation
890 struct inode *gfs2_createi(struct gfs2_holder *ghs, const struct qstr *name,
891 unsigned int mode, dev_t dev)
894 struct gfs2_inode *dip = ghs->gh_gl->gl_object;
895 struct inode *dir = &dip->i_inode;
896 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
897 struct gfs2_inum_host inum;
901 if (!name->len || name->len > GFS2_FNAMESIZE)
902 return ERR_PTR(-ENAMETOOLONG);
904 gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs);
905 error = gfs2_glock_nq(ghs);
909 error = create_ok(dip, name, mode);
913 error = pick_formal_ino(sdp, &inum.no_formal_ino);
917 error = alloc_dinode(dip, &inum, &generation);
921 if (inum.no_addr < dip->i_num.no_addr) {
924 error = gfs2_glock_nq_num(sdp, inum.no_addr,
925 &gfs2_inode_glops, LM_ST_EXCLUSIVE,
928 return ERR_PTR(error);
931 gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs);
932 error = gfs2_glock_nq(ghs);
934 gfs2_glock_dq_uninit(ghs + 1);
935 return ERR_PTR(error);
938 error = create_ok(dip, name, mode);
942 error = gfs2_glock_nq_num(sdp, inum.no_addr,
943 &gfs2_inode_glops, LM_ST_EXCLUSIVE,
949 error = make_dinode(dip, ghs[1].gh_gl, mode, &inum, &generation, dev);
953 inode = gfs2_inode_lookup(dir->i_sb, &inum, IF2DT(mode));
957 error = gfs2_inode_refresh(GFS2_I(inode));
961 error = gfs2_acl_create(dip, GFS2_I(inode));
965 error = gfs2_security_init(dip, GFS2_I(inode));
969 error = link_dinode(dip, name, GFS2_I(inode));
974 return ERR_PTR(-ENOMEM);
980 gfs2_glock_dq_uninit(ghs + 1);
984 return ERR_PTR(error);
988 * gfs2_rmdiri - Remove a directory
989 * @dip: The parent directory of the directory to be removed
990 * @name: The name of the directory to be removed
991 * @ip: The GFS2 inode of the directory to be removed
993 * Assumes Glocks on dip and ip are held
998 int gfs2_rmdiri(struct gfs2_inode *dip, const struct qstr *name,
999 struct gfs2_inode *ip)
1001 struct qstr dotname;
1004 if (ip->i_di.di_entries != 2) {
1005 if (gfs2_consist_inode(ip))
1006 gfs2_dinode_print(ip);
1010 error = gfs2_dir_del(dip, name);
1014 error = gfs2_change_nlink(dip, -1);
1018 gfs2_str2qstr(&dotname, ".");
1019 error = gfs2_dir_del(ip, &dotname);
1023 gfs2_str2qstr(&dotname, "..");
1024 error = gfs2_dir_del(ip, &dotname);
1028 error = gfs2_change_nlink(ip, -2);
1036 * gfs2_unlink_ok - check to see that a inode is still in a directory
1037 * @dip: the directory
1038 * @name: the name of the file
1041 * Assumes that the lock on (at least) @dip is held.
1043 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
1046 int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
1047 struct gfs2_inode *ip)
1049 struct gfs2_inum_host inum;
1053 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
1056 if ((dip->i_di.di_mode & S_ISVTX) &&
1057 dip->i_di.di_uid != current->fsuid &&
1058 ip->i_di.di_uid != current->fsuid && !capable(CAP_FOWNER))
1061 if (IS_APPEND(&dip->i_inode))
1064 error = permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL);
1068 error = gfs2_dir_search(&dip->i_inode, name, &inum, &type);
1072 if (!gfs2_inum_equal(&inum, &ip->i_num))
1075 if (IF2DT(ip->i_di.di_mode) != type) {
1076 gfs2_consist_inode(dip);
1084 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1088 * Follow @to back to the root and make sure we don't encounter @this
1089 * Assumes we already hold the rename lock.
1094 int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1096 struct inode *dir = &to->i_inode;
1097 struct super_block *sb = dir->i_sb;
1102 gfs2_str2qstr(&dotdot, "..");
1107 if (dir == &this->i_inode) {
1111 if (dir == sb->s_root->d_inode) {
1116 tmp = gfs2_lookupi(dir, &dotdot, 1, NULL);
1118 error = PTR_ERR(tmp);
1132 * gfs2_readlinki - return the contents of a symlink
1133 * @ip: the symlink's inode
1134 * @buf: a pointer to the buffer to be filled
1135 * @len: a pointer to the length of @buf
1137 * If @buf is too small, a piece of memory is kmalloc()ed and needs
1138 * to be freed by the caller.
1143 int gfs2_readlinki(struct gfs2_inode *ip, char **buf, unsigned int *len)
1145 struct gfs2_holder i_gh;
1146 struct buffer_head *dibh;
1150 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &i_gh);
1151 error = gfs2_glock_nq_atime(&i_gh);
1153 gfs2_holder_uninit(&i_gh);
1157 if (!ip->i_di.di_size) {
1158 gfs2_consist_inode(ip);
1163 error = gfs2_meta_inode_buffer(ip, &dibh);
1167 x = ip->i_di.di_size + 1;
1169 *buf = kmalloc(x, GFP_KERNEL);
1176 memcpy(*buf, dibh->b_data + sizeof(struct gfs2_dinode), x);
1182 gfs2_glock_dq_uninit(&i_gh);
1187 * gfs2_glock_nq_atime - Acquire a hold on an inode's glock, and
1188 * conditionally update the inode's atime
1189 * @gh: the holder to acquire
1191 * Tests atime (access time) for gfs2_read, gfs2_readdir and gfs2_mmap
1192 * Update if the difference between the current time and the inode's current
1193 * atime is greater than an interval specified at mount.
1198 int gfs2_glock_nq_atime(struct gfs2_holder *gh)
1200 struct gfs2_glock *gl = gh->gh_gl;
1201 struct gfs2_sbd *sdp = gl->gl_sbd;
1202 struct gfs2_inode *ip = gl->gl_object;
1203 s64 curtime, quantum = gfs2_tune_get(sdp, gt_atime_quantum);
1208 if (gfs2_assert_warn(sdp, gh->gh_flags & GL_ATIME) ||
1209 gfs2_assert_warn(sdp, !(gh->gh_flags & GL_ASYNC)) ||
1210 gfs2_assert_warn(sdp, gl->gl_ops == &gfs2_inode_glops))
1213 state = gh->gh_state;
1214 flags = gh->gh_flags;
1216 error = gfs2_glock_nq(gh);
1220 if (test_bit(SDF_NOATIME, &sdp->sd_flags) ||
1221 (sdp->sd_vfs->s_flags & MS_RDONLY))
1224 curtime = get_seconds();
1225 if (curtime - ip->i_di.di_atime >= quantum) {
1227 gfs2_holder_reinit(LM_ST_EXCLUSIVE, gh->gh_flags & ~LM_FLAG_ANY,
1229 error = gfs2_glock_nq(gh);
1233 /* Verify that atime hasn't been updated while we were
1234 trying to get exclusive lock. */
1236 curtime = get_seconds();
1237 if (curtime - ip->i_di.di_atime >= quantum) {
1238 struct buffer_head *dibh;
1239 struct gfs2_dinode *di;
1241 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
1242 if (error == -EROFS)
1247 error = gfs2_meta_inode_buffer(ip, &dibh);
1249 goto fail_end_trans;
1251 ip->i_di.di_atime = curtime;
1253 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1254 di = (struct gfs2_dinode *)dibh->b_data;
1255 di->di_atime = cpu_to_be64(ip->i_di.di_atime);
1258 gfs2_trans_end(sdp);
1261 /* If someone else has asked for the glock,
1262 unlock and let them have it. Then reacquire
1263 in the original state. */
1264 if (gfs2_glock_is_blocking(gl)) {
1266 gfs2_holder_reinit(state, flags, gh);
1267 return gfs2_glock_nq(gh);
1274 gfs2_trans_end(sdp);
1281 * glock_compare_atime - Compare two struct gfs2_glock structures for sort
1282 * @arg_a: the first structure
1283 * @arg_b: the second structure
1285 * Returns: 1 if A > B
1290 static int glock_compare_atime(const void *arg_a, const void *arg_b)
1292 const struct gfs2_holder *gh_a = *(const struct gfs2_holder **)arg_a;
1293 const struct gfs2_holder *gh_b = *(const struct gfs2_holder **)arg_b;
1294 const struct lm_lockname *a = &gh_a->gh_gl->gl_name;
1295 const struct lm_lockname *b = &gh_b->gh_gl->gl_name;
1297 if (a->ln_number > b->ln_number)
1299 if (a->ln_number < b->ln_number)
1301 if (gh_a->gh_state == LM_ST_SHARED && gh_b->gh_state == LM_ST_EXCLUSIVE)
1303 if (gh_a->gh_state == LM_ST_SHARED && (gh_b->gh_flags & GL_ATIME))
1310 * gfs2_glock_nq_m_atime - acquire multiple glocks where one may need an
1312 * @num_gh: the number of structures
1313 * @ghs: an array of struct gfs2_holder structures
1315 * Returns: 0 on success (all glocks acquired),
1316 * errno on failure (no glocks acquired)
1319 int gfs2_glock_nq_m_atime(unsigned int num_gh, struct gfs2_holder *ghs)
1321 struct gfs2_holder **p;
1329 ghs->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC);
1330 if (ghs->gh_flags & GL_ATIME)
1331 error = gfs2_glock_nq_atime(ghs);
1333 error = gfs2_glock_nq(ghs);
1337 p = kcalloc(num_gh, sizeof(struct gfs2_holder *), GFP_KERNEL);
1341 for (x = 0; x < num_gh; x++)
1344 sort(p, num_gh, sizeof(struct gfs2_holder *), glock_compare_atime,NULL);
1346 for (x = 0; x < num_gh; x++) {
1347 p[x]->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC);
1349 if (p[x]->gh_flags & GL_ATIME)
1350 error = gfs2_glock_nq_atime(p[x]);
1352 error = gfs2_glock_nq(p[x]);
1356 gfs2_glock_dq(p[x]);
1367 __gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr)
1369 struct buffer_head *dibh;
1372 error = gfs2_meta_inode_buffer(ip, &dibh);
1374 error = inode_setattr(&ip->i_inode, attr);
1375 gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error);
1376 gfs2_inode_attr_out(ip);
1378 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1379 gfs2_dinode_out(ip, dibh->b_data);
1386 * gfs2_setattr_simple -
1390 * Called with a reference on the vnode.
1395 int gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr)
1399 if (current->journal_info)
1400 return __gfs2_setattr_simple(ip, attr);
1402 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE, 0);
1406 error = __gfs2_setattr_simple(ip, attr);
1407 gfs2_trans_end(GFS2_SB(&ip->i_inode));