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 i_size_write(inode, di->di_size);
55 inode->i_blocks = di->di_blocks <<
56 (GFS2_SB(inode)->sd_sb.sb_bsize_shift - GFS2_BASIC_BLOCK_SHIFT);
58 if (di->di_flags & GFS2_DIF_IMMUTABLE)
59 inode->i_flags |= S_IMMUTABLE;
61 inode->i_flags &= ~S_IMMUTABLE;
63 if (di->di_flags & GFS2_DIF_APPENDONLY)
64 inode->i_flags |= S_APPEND;
66 inode->i_flags &= ~S_APPEND;
69 static int iget_test(struct inode *inode, void *opaque)
71 struct gfs2_inode *ip = GFS2_I(inode);
72 struct gfs2_inum_host *inum = opaque;
74 if (ip && ip->i_num.no_addr == inum->no_addr)
80 static int iget_set(struct inode *inode, void *opaque)
82 struct gfs2_inode *ip = GFS2_I(inode);
83 struct gfs2_inum_host *inum = opaque;
89 struct inode *gfs2_ilookup(struct super_block *sb, struct gfs2_inum_host *inum)
91 return ilookup5(sb, (unsigned long)inum->no_formal_ino,
95 static struct inode *gfs2_iget(struct super_block *sb, struct gfs2_inum_host *inum)
97 return iget5_locked(sb, (unsigned long)inum->no_formal_ino,
98 iget_test, iget_set, inum);
102 * gfs2_inode_lookup - Lookup an inode
103 * @sb: The super block
104 * @inum: The inode number
105 * @type: The type of the inode
107 * Returns: A VFS inode, or an error
110 struct inode *gfs2_inode_lookup(struct super_block *sb, struct gfs2_inum_host *inum, unsigned int type)
112 struct inode *inode = gfs2_iget(sb, inum);
113 struct gfs2_inode *ip = GFS2_I(inode);
114 struct gfs2_glock *io_gl;
118 return ERR_PTR(-ENOBUFS);
120 if (inode->i_state & I_NEW) {
121 struct gfs2_sbd *sdp = GFS2_SB(inode);
122 umode_t mode = DT2IF(type);
123 inode->i_private = ip;
124 inode->i_mode = mode;
127 inode->i_op = &gfs2_file_iops;
128 inode->i_fop = &gfs2_file_fops;
129 inode->i_mapping->a_ops = &gfs2_file_aops;
130 } else if (S_ISDIR(mode)) {
131 inode->i_op = &gfs2_dir_iops;
132 inode->i_fop = &gfs2_dir_fops;
133 } else if (S_ISLNK(mode)) {
134 inode->i_op = &gfs2_symlink_iops;
136 inode->i_op = &gfs2_dev_iops;
139 error = gfs2_glock_get(sdp, inum->no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
142 ip->i_gl->gl_object = ip;
144 error = gfs2_glock_get(sdp, inum->no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
148 ip->i_vn = ip->i_gl->gl_vn - 1;
149 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
153 gfs2_glock_put(io_gl);
154 unlock_new_inode(inode);
159 gfs2_glock_put(io_gl);
161 ip->i_gl->gl_object = NULL;
162 gfs2_glock_put(ip->i_gl);
165 return ERR_PTR(error);
168 static int gfs2_dinode_in(struct gfs2_inode *ip, const void *buf)
170 struct gfs2_dinode_host *di = &ip->i_di;
171 const struct gfs2_dinode *str = buf;
173 if (ip->i_num.no_addr != be64_to_cpu(str->di_num.no_addr)) {
174 if (gfs2_consist_inode(ip))
175 gfs2_dinode_print(ip);
178 if (ip->i_num.no_formal_ino != be64_to_cpu(str->di_num.no_formal_ino))
181 ip->i_inode.i_mode = be32_to_cpu(str->di_mode);
182 ip->i_inode.i_rdev = 0;
183 switch (ip->i_inode.i_mode & S_IFMT) {
186 ip->i_inode.i_rdev = MKDEV(be32_to_cpu(str->di_major),
187 be32_to_cpu(str->di_minor));
191 ip->i_inode.i_uid = be32_to_cpu(str->di_uid);
192 ip->i_inode.i_gid = be32_to_cpu(str->di_gid);
194 * We will need to review setting the nlink count here in the
195 * light of the forthcoming ro bind mount work. This is a reminder
198 ip->i_inode.i_nlink = be32_to_cpu(str->di_nlink);
199 di->di_size = be64_to_cpu(str->di_size);
200 di->di_blocks = be64_to_cpu(str->di_blocks);
201 ip->i_inode.i_atime.tv_sec = be64_to_cpu(str->di_atime);
202 ip->i_inode.i_atime.tv_nsec = 0;
203 ip->i_inode.i_mtime.tv_sec = be64_to_cpu(str->di_mtime);
204 ip->i_inode.i_mtime.tv_nsec = 0;
205 ip->i_inode.i_ctime.tv_sec = be64_to_cpu(str->di_ctime);
206 ip->i_inode.i_ctime.tv_nsec = 0;
208 di->di_goal_meta = be64_to_cpu(str->di_goal_meta);
209 di->di_goal_data = be64_to_cpu(str->di_goal_data);
210 di->di_generation = be64_to_cpu(str->di_generation);
212 di->di_flags = be32_to_cpu(str->di_flags);
213 di->di_payload_format = be32_to_cpu(str->di_payload_format);
214 di->di_height = be16_to_cpu(str->di_height);
216 di->di_depth = be16_to_cpu(str->di_depth);
217 di->di_entries = be32_to_cpu(str->di_entries);
219 di->di_eattr = be64_to_cpu(str->di_eattr);
224 * gfs2_inode_refresh - Refresh the incore copy of the dinode
225 * @ip: The GFS2 inode
230 int gfs2_inode_refresh(struct gfs2_inode *ip)
232 struct buffer_head *dibh;
235 error = gfs2_meta_inode_buffer(ip, &dibh);
239 if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), dibh, GFS2_METATYPE_DI)) {
244 error = gfs2_dinode_in(ip, dibh->b_data);
246 ip->i_vn = ip->i_gl->gl_vn;
251 int gfs2_dinode_dealloc(struct gfs2_inode *ip)
253 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
254 struct gfs2_alloc *al;
255 struct gfs2_rgrpd *rgd;
258 if (ip->i_di.di_blocks != 1) {
259 if (gfs2_consist_inode(ip))
260 gfs2_dinode_print(ip);
264 al = gfs2_alloc_get(ip);
266 error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
270 error = gfs2_rindex_hold(sdp, &al->al_ri_gh);
274 rgd = gfs2_blk2rgrpd(sdp, ip->i_num.no_addr);
276 gfs2_consist_inode(ip);
278 goto out_rindex_relse;
281 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0,
284 goto out_rindex_relse;
286 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA, 1);
290 gfs2_trans_add_gl(ip->i_gl);
292 gfs2_free_di(rgd, ip);
295 clear_bit(GLF_STICKY, &ip->i_gl->gl_flags);
298 gfs2_glock_dq_uninit(&al->al_rgd_gh);
300 gfs2_glock_dq_uninit(&al->al_ri_gh);
302 gfs2_quota_unhold(ip);
309 * gfs2_change_nlink - Change nlink count on inode
310 * @ip: The GFS2 inode
311 * @diff: The change in the nlink count required
316 int gfs2_change_nlink(struct gfs2_inode *ip, int diff)
318 struct gfs2_sbd *sdp = ip->i_inode.i_sb->s_fs_info;
319 struct buffer_head *dibh;
323 BUG_ON(diff != 1 && diff != -1);
324 nlink = ip->i_inode.i_nlink + diff;
326 /* If we are reducing the nlink count, but the new value ends up being
327 bigger than the old one, we must have underflowed. */
328 if (diff < 0 && nlink > ip->i_inode.i_nlink) {
329 if (gfs2_consist_inode(ip))
330 gfs2_dinode_print(ip);
334 error = gfs2_meta_inode_buffer(ip, &dibh);
339 inc_nlink(&ip->i_inode);
341 drop_nlink(&ip->i_inode);
343 ip->i_inode.i_ctime.tv_sec = get_seconds();
345 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
346 gfs2_dinode_out(ip, dibh->b_data);
348 mark_inode_dirty(&ip->i_inode);
350 if (ip->i_inode.i_nlink == 0) {
351 struct gfs2_rgrpd *rgd;
352 struct gfs2_holder ri_gh, rg_gh;
354 error = gfs2_rindex_hold(sdp, &ri_gh);
358 rgd = gfs2_blk2rgrpd(sdp, ip->i_num.no_addr);
361 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &rg_gh);
365 gfs2_unlink_di(&ip->i_inode); /* mark inode unlinked */
366 gfs2_glock_dq_uninit(&rg_gh);
368 gfs2_glock_dq_uninit(&ri_gh);
374 struct inode *gfs2_lookup_simple(struct inode *dip, const char *name)
377 gfs2_str2qstr(&qstr, name);
378 return gfs2_lookupi(dip, &qstr, 1, NULL);
383 * gfs2_lookupi - Look up a filename in a directory and return its inode
384 * @d_gh: An initialized holder for the directory glock
385 * @name: The name of the inode to look for
386 * @is_root: If 1, ignore the caller's permissions
387 * @i_gh: An uninitialized holder for the new inode glock
389 * There will always be a vnode (Linux VFS inode) for the d_gh inode unless
395 struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
396 int is_root, struct nameidata *nd)
398 struct super_block *sb = dir->i_sb;
399 struct gfs2_inode *dip = GFS2_I(dir);
400 struct gfs2_holder d_gh;
401 struct gfs2_inum_host inum;
404 struct inode *inode = NULL;
406 if (!name->len || name->len > GFS2_FNAMESIZE)
407 return ERR_PTR(-ENAMETOOLONG);
409 if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) ||
410 (name->len == 2 && memcmp(name->name, "..", 2) == 0 &&
411 dir == sb->s_root->d_inode)) {
416 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
418 return ERR_PTR(error);
421 error = permission(dir, MAY_EXEC, NULL);
426 error = gfs2_dir_search(dir, name, &inum, &type);
430 inode = gfs2_inode_lookup(sb, &inum, type);
433 gfs2_glock_dq_uninit(&d_gh);
434 if (error == -ENOENT)
439 static int pick_formal_ino_1(struct gfs2_sbd *sdp, u64 *formal_ino)
441 struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode);
442 struct buffer_head *bh;
443 struct gfs2_inum_range_host ir;
446 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
449 mutex_lock(&sdp->sd_inum_mutex);
451 error = gfs2_meta_inode_buffer(ip, &bh);
453 mutex_unlock(&sdp->sd_inum_mutex);
458 gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode));
461 *formal_ino = ir.ir_start++;
463 gfs2_trans_add_bh(ip->i_gl, bh, 1);
464 gfs2_inum_range_out(&ir,
465 bh->b_data + sizeof(struct gfs2_dinode));
467 mutex_unlock(&sdp->sd_inum_mutex);
474 mutex_unlock(&sdp->sd_inum_mutex);
480 static int pick_formal_ino_2(struct gfs2_sbd *sdp, u64 *formal_ino)
482 struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode);
483 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_inum_inode);
484 struct gfs2_holder gh;
485 struct buffer_head *bh;
486 struct gfs2_inum_range_host ir;
489 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
493 error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0);
496 mutex_lock(&sdp->sd_inum_mutex);
498 error = gfs2_meta_inode_buffer(ip, &bh);
502 gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode));
505 struct buffer_head *m_bh;
509 error = gfs2_meta_inode_buffer(m_ip, &m_bh);
513 z = *(__be64 *)(m_bh->b_data + sizeof(struct gfs2_dinode));
514 x = y = be64_to_cpu(z);
516 ir.ir_length = GFS2_INUM_QUANTUM;
517 x += GFS2_INUM_QUANTUM;
519 gfs2_consist_inode(m_ip);
521 gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1);
522 *(__be64 *)(m_bh->b_data + sizeof(struct gfs2_dinode)) = z;
527 *formal_ino = ir.ir_start++;
530 gfs2_trans_add_bh(ip->i_gl, bh, 1);
531 gfs2_inum_range_out(&ir, bh->b_data + sizeof(struct gfs2_dinode));
536 mutex_unlock(&sdp->sd_inum_mutex);
539 gfs2_glock_dq_uninit(&gh);
543 static int pick_formal_ino(struct gfs2_sbd *sdp, u64 *inum)
547 error = pick_formal_ino_1(sdp, inum);
551 error = pick_formal_ino_2(sdp, inum);
557 * create_ok - OK to create a new on-disk inode here?
558 * @dip: Directory in which dinode is to be created
559 * @name: Name of new dinode
565 static int create_ok(struct gfs2_inode *dip, const struct qstr *name,
570 error = permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL);
574 /* Don't create entries in an unlinked directory */
575 if (!dip->i_inode.i_nlink)
578 error = gfs2_dir_search(&dip->i_inode, name, NULL, NULL);
589 if (dip->i_di.di_entries == (u32)-1)
591 if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1)
597 static void munge_mode_uid_gid(struct gfs2_inode *dip, unsigned int *mode,
598 unsigned int *uid, unsigned int *gid)
600 if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir &&
601 (dip->i_inode.i_mode & S_ISUID) && dip->i_inode.i_uid) {
604 else if (dip->i_inode.i_uid != current->fsuid)
606 *uid = dip->i_inode.i_uid;
608 *uid = current->fsuid;
610 if (dip->i_inode.i_mode & S_ISGID) {
613 *gid = dip->i_inode.i_gid;
615 *gid = current->fsgid;
618 static int alloc_dinode(struct gfs2_inode *dip, struct gfs2_inum_host *inum,
621 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
626 dip->i_alloc.al_requested = RES_DINODE;
627 error = gfs2_inplace_reserve(dip);
631 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS, 0);
635 inum->no_addr = gfs2_alloc_di(dip, generation);
640 gfs2_inplace_release(dip);
647 * init_dinode - Fill in a new dinode structure
648 * @dip: the directory this inode is being created in
649 * @gl: The glock covering the new inode
650 * @inum: the inode number
651 * @mode: the file permissions
657 static void init_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
658 const struct gfs2_inum_host *inum, unsigned int mode,
659 unsigned int uid, unsigned int gid,
660 const u64 *generation, dev_t dev)
662 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
663 struct gfs2_dinode *di;
664 struct buffer_head *dibh;
666 dibh = gfs2_meta_new(gl, inum->no_addr);
667 gfs2_trans_add_bh(gl, dibh, 1);
668 gfs2_metatype_set(dibh, GFS2_METATYPE_DI, GFS2_FORMAT_DI);
669 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
670 di = (struct gfs2_dinode *)dibh->b_data;
672 di->di_num.no_formal_ino = cpu_to_be64(inum->no_formal_ino);
673 di->di_num.no_addr = cpu_to_be64(inum->no_addr);
674 di->di_mode = cpu_to_be32(mode);
675 di->di_uid = cpu_to_be32(uid);
676 di->di_gid = cpu_to_be32(gid);
677 di->di_nlink = cpu_to_be32(0);
678 di->di_size = cpu_to_be64(0);
679 di->di_blocks = cpu_to_be64(1);
680 di->di_atime = di->di_mtime = di->di_ctime = cpu_to_be64(get_seconds());
681 di->di_major = cpu_to_be32(MAJOR(dev));
682 di->di_minor = cpu_to_be32(MINOR(dev));
683 di->di_goal_meta = di->di_goal_data = cpu_to_be64(inum->no_addr);
684 di->di_generation = cpu_to_be64(*generation);
685 di->di_flags = cpu_to_be32(0);
688 if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_JDATA) ||
689 gfs2_tune_get(sdp, gt_new_files_jdata))
690 di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA);
691 if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_DIRECTIO) ||
692 gfs2_tune_get(sdp, gt_new_files_directio))
693 di->di_flags |= cpu_to_be32(GFS2_DIF_DIRECTIO);
694 } else if (S_ISDIR(mode)) {
695 di->di_flags |= cpu_to_be32(dip->i_di.di_flags &
696 GFS2_DIF_INHERIT_DIRECTIO);
697 di->di_flags |= cpu_to_be32(dip->i_di.di_flags &
698 GFS2_DIF_INHERIT_JDATA);
702 di->di_payload_format = cpu_to_be32(0);
703 di->di_height = cpu_to_be32(0);
706 di->di_depth = cpu_to_be16(0);
707 di->di_entries = cpu_to_be32(0);
708 memset(&di->__pad4, 0, sizeof(di->__pad4));
709 di->di_eattr = cpu_to_be64(0);
710 memset(&di->di_reserved, 0, sizeof(di->di_reserved));
715 static int make_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
716 unsigned int mode, const struct gfs2_inum_host *inum,
717 const u64 *generation, dev_t dev)
719 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
720 unsigned int uid, gid;
723 munge_mode_uid_gid(dip, &mode, &uid, &gid);
726 error = gfs2_quota_lock(dip, uid, gid);
730 error = gfs2_quota_check(dip, uid, gid);
734 error = gfs2_trans_begin(sdp, RES_DINODE + RES_QUOTA, 0);
738 init_dinode(dip, gl, inum, mode, uid, gid, generation, dev);
739 gfs2_quota_change(dip, +1, uid, gid);
743 gfs2_quota_unlock(dip);
749 static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
750 struct gfs2_inode *ip)
752 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
753 struct gfs2_alloc *al;
755 struct buffer_head *dibh;
758 al = gfs2_alloc_get(dip);
760 error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
764 error = alloc_required = gfs2_diradd_alloc_required(&dip->i_inode, name);
765 if (alloc_required < 0)
767 if (alloc_required) {
768 error = gfs2_quota_check(dip, dip->i_inode.i_uid, dip->i_inode.i_gid);
770 goto fail_quota_locks;
772 al->al_requested = sdp->sd_max_dirres;
774 error = gfs2_inplace_reserve(dip);
776 goto fail_quota_locks;
778 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
779 al->al_rgd->rd_ri.ri_length +
781 RES_STATFS + RES_QUOTA, 0);
785 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
787 goto fail_quota_locks;
790 error = gfs2_dir_add(&dip->i_inode, name, &ip->i_num, IF2DT(ip->i_inode.i_mode));
794 error = gfs2_meta_inode_buffer(ip, &dibh);
797 ip->i_inode.i_nlink = 1;
798 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
799 gfs2_dinode_out(ip, dibh->b_data);
807 if (dip->i_alloc.al_rgd)
808 gfs2_inplace_release(dip);
811 gfs2_quota_unlock(dip);
818 static int gfs2_security_init(struct gfs2_inode *dip, struct gfs2_inode *ip)
824 struct gfs2_ea_request er;
826 err = security_inode_init_security(&ip->i_inode, &dip->i_inode,
827 &name, &value, &len);
830 if (err == -EOPNOTSUPP)
835 memset(&er, 0, sizeof(struct gfs2_ea_request));
837 er.er_type = GFS2_EATYPE_SECURITY;
840 er.er_name_len = strlen(name);
841 er.er_data_len = len;
843 err = gfs2_ea_set_i(ip, &er);
852 * gfs2_createi - Create a new inode
853 * @ghs: An array of two holders
854 * @name: The name of the new file
855 * @mode: the permissions on the new inode
857 * @ghs[0] is an initialized holder for the directory
858 * @ghs[1] is the holder for the inode lock
860 * If the return value is not NULL, the glocks on both the directory and the new
861 * file are held. A transaction has been started and an inplace reservation
867 struct inode *gfs2_createi(struct gfs2_holder *ghs, const struct qstr *name,
868 unsigned int mode, dev_t dev)
871 struct gfs2_inode *dip = ghs->gh_gl->gl_object;
872 struct inode *dir = &dip->i_inode;
873 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
874 struct gfs2_inum_host inum;
878 if (!name->len || name->len > GFS2_FNAMESIZE)
879 return ERR_PTR(-ENAMETOOLONG);
881 gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs);
882 error = gfs2_glock_nq(ghs);
886 error = create_ok(dip, name, mode);
890 error = pick_formal_ino(sdp, &inum.no_formal_ino);
894 error = alloc_dinode(dip, &inum, &generation);
898 if (inum.no_addr < dip->i_num.no_addr) {
901 error = gfs2_glock_nq_num(sdp, inum.no_addr,
902 &gfs2_inode_glops, LM_ST_EXCLUSIVE,
905 return ERR_PTR(error);
908 gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs);
909 error = gfs2_glock_nq(ghs);
911 gfs2_glock_dq_uninit(ghs + 1);
912 return ERR_PTR(error);
915 error = create_ok(dip, name, mode);
919 error = gfs2_glock_nq_num(sdp, inum.no_addr,
920 &gfs2_inode_glops, LM_ST_EXCLUSIVE,
926 error = make_dinode(dip, ghs[1].gh_gl, mode, &inum, &generation, dev);
930 inode = gfs2_inode_lookup(dir->i_sb, &inum, IF2DT(mode));
934 error = gfs2_inode_refresh(GFS2_I(inode));
938 error = gfs2_acl_create(dip, GFS2_I(inode));
942 error = gfs2_security_init(dip, GFS2_I(inode));
946 error = link_dinode(dip, name, GFS2_I(inode));
951 return ERR_PTR(-ENOMEM);
957 gfs2_glock_dq_uninit(ghs + 1);
961 return ERR_PTR(error);
965 * gfs2_rmdiri - Remove a directory
966 * @dip: The parent directory of the directory to be removed
967 * @name: The name of the directory to be removed
968 * @ip: The GFS2 inode of the directory to be removed
970 * Assumes Glocks on dip and ip are held
975 int gfs2_rmdiri(struct gfs2_inode *dip, const struct qstr *name,
976 struct gfs2_inode *ip)
981 if (ip->i_di.di_entries != 2) {
982 if (gfs2_consist_inode(ip))
983 gfs2_dinode_print(ip);
987 error = gfs2_dir_del(dip, name);
991 error = gfs2_change_nlink(dip, -1);
995 gfs2_str2qstr(&dotname, ".");
996 error = gfs2_dir_del(ip, &dotname);
1000 gfs2_str2qstr(&dotname, "..");
1001 error = gfs2_dir_del(ip, &dotname);
1005 /* It looks odd, but it really should be done twice */
1006 error = gfs2_change_nlink(ip, -1);
1010 error = gfs2_change_nlink(ip, -1);
1018 * gfs2_unlink_ok - check to see that a inode is still in a directory
1019 * @dip: the directory
1020 * @name: the name of the file
1023 * Assumes that the lock on (at least) @dip is held.
1025 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
1028 int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
1029 struct gfs2_inode *ip)
1031 struct gfs2_inum_host inum;
1035 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
1038 if ((dip->i_inode.i_mode & S_ISVTX) &&
1039 dip->i_inode.i_uid != current->fsuid &&
1040 ip->i_inode.i_uid != current->fsuid && !capable(CAP_FOWNER))
1043 if (IS_APPEND(&dip->i_inode))
1046 error = permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL);
1050 error = gfs2_dir_search(&dip->i_inode, name, &inum, &type);
1054 if (!gfs2_inum_equal(&inum, &ip->i_num))
1057 if (IF2DT(ip->i_inode.i_mode) != type) {
1058 gfs2_consist_inode(dip);
1066 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1070 * Follow @to back to the root and make sure we don't encounter @this
1071 * Assumes we already hold the rename lock.
1076 int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1078 struct inode *dir = &to->i_inode;
1079 struct super_block *sb = dir->i_sb;
1084 gfs2_str2qstr(&dotdot, "..");
1089 if (dir == &this->i_inode) {
1093 if (dir == sb->s_root->d_inode) {
1098 tmp = gfs2_lookupi(dir, &dotdot, 1, NULL);
1100 error = PTR_ERR(tmp);
1114 * gfs2_readlinki - return the contents of a symlink
1115 * @ip: the symlink's inode
1116 * @buf: a pointer to the buffer to be filled
1117 * @len: a pointer to the length of @buf
1119 * If @buf is too small, a piece of memory is kmalloc()ed and needs
1120 * to be freed by the caller.
1125 int gfs2_readlinki(struct gfs2_inode *ip, char **buf, unsigned int *len)
1127 struct gfs2_holder i_gh;
1128 struct buffer_head *dibh;
1132 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &i_gh);
1133 error = gfs2_glock_nq_atime(&i_gh);
1135 gfs2_holder_uninit(&i_gh);
1139 if (!ip->i_di.di_size) {
1140 gfs2_consist_inode(ip);
1145 error = gfs2_meta_inode_buffer(ip, &dibh);
1149 x = ip->i_di.di_size + 1;
1151 *buf = kmalloc(x, GFP_KERNEL);
1158 memcpy(*buf, dibh->b_data + sizeof(struct gfs2_dinode), x);
1164 gfs2_glock_dq_uninit(&i_gh);
1169 * gfs2_glock_nq_atime - Acquire a hold on an inode's glock, and
1170 * conditionally update the inode's atime
1171 * @gh: the holder to acquire
1173 * Tests atime (access time) for gfs2_read, gfs2_readdir and gfs2_mmap
1174 * Update if the difference between the current time and the inode's current
1175 * atime is greater than an interval specified at mount.
1180 int gfs2_glock_nq_atime(struct gfs2_holder *gh)
1182 struct gfs2_glock *gl = gh->gh_gl;
1183 struct gfs2_sbd *sdp = gl->gl_sbd;
1184 struct gfs2_inode *ip = gl->gl_object;
1185 s64 curtime, quantum = gfs2_tune_get(sdp, gt_atime_quantum);
1190 if (gfs2_assert_warn(sdp, gh->gh_flags & GL_ATIME) ||
1191 gfs2_assert_warn(sdp, !(gh->gh_flags & GL_ASYNC)) ||
1192 gfs2_assert_warn(sdp, gl->gl_ops == &gfs2_inode_glops))
1195 state = gh->gh_state;
1196 flags = gh->gh_flags;
1198 error = gfs2_glock_nq(gh);
1202 if (test_bit(SDF_NOATIME, &sdp->sd_flags) ||
1203 (sdp->sd_vfs->s_flags & MS_RDONLY))
1206 curtime = get_seconds();
1207 if (curtime - ip->i_inode.i_atime.tv_sec >= quantum) {
1209 gfs2_holder_reinit(LM_ST_EXCLUSIVE, gh->gh_flags & ~LM_FLAG_ANY,
1211 error = gfs2_glock_nq(gh);
1215 /* Verify that atime hasn't been updated while we were
1216 trying to get exclusive lock. */
1218 curtime = get_seconds();
1219 if (curtime - ip->i_inode.i_atime.tv_sec >= quantum) {
1220 struct buffer_head *dibh;
1221 struct gfs2_dinode *di;
1223 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
1224 if (error == -EROFS)
1229 error = gfs2_meta_inode_buffer(ip, &dibh);
1231 goto fail_end_trans;
1233 ip->i_inode.i_atime.tv_sec = curtime;
1235 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1236 di = (struct gfs2_dinode *)dibh->b_data;
1237 di->di_atime = cpu_to_be64(ip->i_inode.i_atime.tv_sec);
1240 gfs2_trans_end(sdp);
1243 /* If someone else has asked for the glock,
1244 unlock and let them have it. Then reacquire
1245 in the original state. */
1246 if (gfs2_glock_is_blocking(gl)) {
1248 gfs2_holder_reinit(state, flags, gh);
1249 return gfs2_glock_nq(gh);
1256 gfs2_trans_end(sdp);
1263 * glock_compare_atime - Compare two struct gfs2_glock structures for sort
1264 * @arg_a: the first structure
1265 * @arg_b: the second structure
1267 * Returns: 1 if A > B
1272 static int glock_compare_atime(const void *arg_a, const void *arg_b)
1274 const struct gfs2_holder *gh_a = *(const struct gfs2_holder **)arg_a;
1275 const struct gfs2_holder *gh_b = *(const struct gfs2_holder **)arg_b;
1276 const struct lm_lockname *a = &gh_a->gh_gl->gl_name;
1277 const struct lm_lockname *b = &gh_b->gh_gl->gl_name;
1279 if (a->ln_number > b->ln_number)
1281 if (a->ln_number < b->ln_number)
1283 if (gh_a->gh_state == LM_ST_SHARED && gh_b->gh_state == LM_ST_EXCLUSIVE)
1285 if (gh_a->gh_state == LM_ST_SHARED && (gh_b->gh_flags & GL_ATIME))
1292 * gfs2_glock_nq_m_atime - acquire multiple glocks where one may need an
1294 * @num_gh: the number of structures
1295 * @ghs: an array of struct gfs2_holder structures
1297 * Returns: 0 on success (all glocks acquired),
1298 * errno on failure (no glocks acquired)
1301 int gfs2_glock_nq_m_atime(unsigned int num_gh, struct gfs2_holder *ghs)
1303 struct gfs2_holder **p;
1311 ghs->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC);
1312 if (ghs->gh_flags & GL_ATIME)
1313 error = gfs2_glock_nq_atime(ghs);
1315 error = gfs2_glock_nq(ghs);
1319 p = kcalloc(num_gh, sizeof(struct gfs2_holder *), GFP_KERNEL);
1323 for (x = 0; x < num_gh; x++)
1326 sort(p, num_gh, sizeof(struct gfs2_holder *), glock_compare_atime,NULL);
1328 for (x = 0; x < num_gh; x++) {
1329 p[x]->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC);
1331 if (p[x]->gh_flags & GL_ATIME)
1332 error = gfs2_glock_nq_atime(p[x]);
1334 error = gfs2_glock_nq(p[x]);
1338 gfs2_glock_dq(p[x]);
1349 __gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr)
1351 struct buffer_head *dibh;
1354 error = gfs2_meta_inode_buffer(ip, &dibh);
1356 error = inode_setattr(&ip->i_inode, attr);
1357 gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error);
1358 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1359 gfs2_dinode_out(ip, dibh->b_data);
1366 * gfs2_setattr_simple -
1370 * Called with a reference on the vnode.
1375 int gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr)
1379 if (current->journal_info)
1380 return __gfs2_setattr_simple(ip, attr);
1382 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE, 0);
1386 error = __gfs2_setattr_simple(ip, attr);
1387 gfs2_trans_end(GFS2_SB(&ip->i_inode));