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;
55 switch (di->di_mode & S_IFMT) {
58 inode->i_rdev = MKDEV(di->di_major, di->di_minor);
65 inode->i_mode = di->di_mode;
66 inode->i_nlink = di->di_nlink;
67 inode->i_uid = di->di_uid;
68 inode->i_gid = di->di_gid;
69 i_size_write(inode, di->di_size);
70 inode->i_atime.tv_sec = di->di_atime;
71 inode->i_mtime.tv_sec = di->di_mtime;
72 inode->i_ctime.tv_sec = di->di_ctime;
73 inode->i_atime.tv_nsec = 0;
74 inode->i_mtime.tv_nsec = 0;
75 inode->i_ctime.tv_nsec = 0;
76 inode->i_blocks = di->di_blocks <<
77 (GFS2_SB(inode)->sd_sb.sb_bsize_shift - GFS2_BASIC_BLOCK_SHIFT);
79 if (di->di_flags & GFS2_DIF_IMMUTABLE)
80 inode->i_flags |= S_IMMUTABLE;
82 inode->i_flags &= ~S_IMMUTABLE;
84 if (di->di_flags & GFS2_DIF_APPENDONLY)
85 inode->i_flags |= S_APPEND;
87 inode->i_flags &= ~S_APPEND;
91 * gfs2_inode_attr_out - Copy attributes from VFS inode into the dinode
94 * Only copy out the attributes that we want the VFS layer
95 * to be able to modify.
98 void gfs2_inode_attr_out(struct gfs2_inode *ip)
100 struct inode *inode = &ip->i_inode;
101 struct gfs2_dinode_host *di = &ip->i_di;
102 gfs2_assert_withdraw(GFS2_SB(inode),
103 (di->di_mode & S_IFMT) == (inode->i_mode & S_IFMT));
104 di->di_mode = inode->i_mode;
105 di->di_uid = inode->i_uid;
106 di->di_gid = inode->i_gid;
107 di->di_atime = inode->i_atime.tv_sec;
108 di->di_mtime = inode->i_mtime.tv_sec;
109 di->di_ctime = inode->i_ctime.tv_sec;
112 static int iget_test(struct inode *inode, void *opaque)
114 struct gfs2_inode *ip = GFS2_I(inode);
115 struct gfs2_inum_host *inum = opaque;
117 if (ip && ip->i_num.no_addr == inum->no_addr)
123 static int iget_set(struct inode *inode, void *opaque)
125 struct gfs2_inode *ip = GFS2_I(inode);
126 struct gfs2_inum_host *inum = opaque;
132 struct inode *gfs2_ilookup(struct super_block *sb, struct gfs2_inum_host *inum)
134 return ilookup5(sb, (unsigned long)inum->no_formal_ino,
138 static struct inode *gfs2_iget(struct super_block *sb, struct gfs2_inum_host *inum)
140 return iget5_locked(sb, (unsigned long)inum->no_formal_ino,
141 iget_test, iget_set, inum);
145 * gfs2_inode_lookup - Lookup an inode
146 * @sb: The super block
147 * @inum: The inode number
148 * @type: The type of the inode
150 * Returns: A VFS inode, or an error
153 struct inode *gfs2_inode_lookup(struct super_block *sb, struct gfs2_inum_host *inum, unsigned int type)
155 struct inode *inode = gfs2_iget(sb, inum);
156 struct gfs2_inode *ip = GFS2_I(inode);
157 struct gfs2_glock *io_gl;
161 return ERR_PTR(-ENOBUFS);
163 if (inode->i_state & I_NEW) {
164 struct gfs2_sbd *sdp = GFS2_SB(inode);
165 umode_t mode = DT2IF(type);
166 inode->i_private = ip;
167 inode->i_mode = mode;
170 inode->i_op = &gfs2_file_iops;
171 inode->i_fop = &gfs2_file_fops;
172 inode->i_mapping->a_ops = &gfs2_file_aops;
173 } else if (S_ISDIR(mode)) {
174 inode->i_op = &gfs2_dir_iops;
175 inode->i_fop = &gfs2_dir_fops;
176 } else if (S_ISLNK(mode)) {
177 inode->i_op = &gfs2_symlink_iops;
179 inode->i_op = &gfs2_dev_iops;
182 error = gfs2_glock_get(sdp, inum->no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
185 ip->i_gl->gl_object = ip;
187 error = gfs2_glock_get(sdp, inum->no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
191 ip->i_vn = ip->i_gl->gl_vn - 1;
192 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
196 gfs2_glock_put(io_gl);
197 unlock_new_inode(inode);
202 gfs2_glock_put(io_gl);
204 ip->i_gl->gl_object = NULL;
205 gfs2_glock_put(ip->i_gl);
208 return ERR_PTR(error);
211 static void gfs2_dinode_in(struct gfs2_inode *ip, const void *buf)
213 struct gfs2_dinode_host *di = &ip->i_di;
214 const struct gfs2_dinode *str = buf;
216 gfs2_meta_header_in(&di->di_header, buf);
217 gfs2_inum_in(&di->di_num, &str->di_num);
219 di->di_mode = be32_to_cpu(str->di_mode);
220 di->di_uid = be32_to_cpu(str->di_uid);
221 di->di_gid = be32_to_cpu(str->di_gid);
222 di->di_nlink = be32_to_cpu(str->di_nlink);
223 di->di_size = be64_to_cpu(str->di_size);
224 di->di_blocks = be64_to_cpu(str->di_blocks);
225 di->di_atime = be64_to_cpu(str->di_atime);
226 di->di_mtime = be64_to_cpu(str->di_mtime);
227 di->di_ctime = be64_to_cpu(str->di_ctime);
228 di->di_major = be32_to_cpu(str->di_major);
229 di->di_minor = be32_to_cpu(str->di_minor);
231 di->di_goal_meta = be64_to_cpu(str->di_goal_meta);
232 di->di_goal_data = be64_to_cpu(str->di_goal_data);
233 di->di_generation = be64_to_cpu(str->di_generation);
235 di->di_flags = be32_to_cpu(str->di_flags);
236 di->di_payload_format = be32_to_cpu(str->di_payload_format);
237 di->di_height = be16_to_cpu(str->di_height);
239 di->di_depth = be16_to_cpu(str->di_depth);
240 di->di_entries = be32_to_cpu(str->di_entries);
242 di->di_eattr = be64_to_cpu(str->di_eattr);
246 * gfs2_inode_refresh - Refresh the incore copy of the dinode
247 * @ip: The GFS2 inode
252 int gfs2_inode_refresh(struct gfs2_inode *ip)
254 struct buffer_head *dibh;
257 error = gfs2_meta_inode_buffer(ip, &dibh);
261 if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), dibh, GFS2_METATYPE_DI)) {
266 gfs2_dinode_in(ip, dibh->b_data);
270 if (ip->i_num.no_addr != ip->i_di.di_num.no_addr) {
271 if (gfs2_consist_inode(ip))
272 gfs2_dinode_print(&ip->i_di);
275 if (ip->i_num.no_formal_ino != ip->i_di.di_num.no_formal_ino)
278 ip->i_vn = ip->i_gl->gl_vn;
283 int gfs2_dinode_dealloc(struct gfs2_inode *ip)
285 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
286 struct gfs2_alloc *al;
287 struct gfs2_rgrpd *rgd;
290 if (ip->i_di.di_blocks != 1) {
291 if (gfs2_consist_inode(ip))
292 gfs2_dinode_print(&ip->i_di);
296 al = gfs2_alloc_get(ip);
298 error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
302 error = gfs2_rindex_hold(sdp, &al->al_ri_gh);
306 rgd = gfs2_blk2rgrpd(sdp, ip->i_num.no_addr);
308 gfs2_consist_inode(ip);
310 goto out_rindex_relse;
313 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0,
316 goto out_rindex_relse;
318 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA, 1);
322 gfs2_trans_add_gl(ip->i_gl);
324 gfs2_free_di(rgd, ip);
327 clear_bit(GLF_STICKY, &ip->i_gl->gl_flags);
330 gfs2_glock_dq_uninit(&al->al_rgd_gh);
332 gfs2_glock_dq_uninit(&al->al_ri_gh);
334 gfs2_quota_unhold(ip);
341 * gfs2_change_nlink - Change nlink count on inode
342 * @ip: The GFS2 inode
343 * @diff: The change in the nlink count required
348 int gfs2_change_nlink(struct gfs2_inode *ip, int diff)
350 struct gfs2_sbd *sdp = ip->i_inode.i_sb->s_fs_info;
351 struct buffer_head *dibh;
355 BUG_ON(ip->i_di.di_nlink != ip->i_inode.i_nlink);
356 nlink = ip->i_di.di_nlink + diff;
358 /* If we are reducing the nlink count, but the new value ends up being
359 bigger than the old one, we must have underflowed. */
360 if (diff < 0 && nlink > ip->i_di.di_nlink) {
361 if (gfs2_consist_inode(ip))
362 gfs2_dinode_print(&ip->i_di);
366 error = gfs2_meta_inode_buffer(ip, &dibh);
370 ip->i_di.di_nlink = nlink;
371 ip->i_di.di_ctime = get_seconds();
372 ip->i_inode.i_nlink = nlink;
374 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
375 gfs2_dinode_out(ip, dibh->b_data);
377 mark_inode_dirty(&ip->i_inode);
379 if (ip->i_di.di_nlink == 0) {
380 struct gfs2_rgrpd *rgd;
381 struct gfs2_holder ri_gh, rg_gh;
383 error = gfs2_rindex_hold(sdp, &ri_gh);
387 rgd = gfs2_blk2rgrpd(sdp, ip->i_num.no_addr);
390 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &rg_gh);
394 clear_nlink(&ip->i_inode);
395 gfs2_unlink_di(&ip->i_inode); /* mark inode unlinked */
396 gfs2_glock_dq_uninit(&rg_gh);
398 gfs2_glock_dq_uninit(&ri_gh);
404 struct inode *gfs2_lookup_simple(struct inode *dip, const char *name)
407 gfs2_str2qstr(&qstr, name);
408 return gfs2_lookupi(dip, &qstr, 1, NULL);
413 * gfs2_lookupi - Look up a filename in a directory and return its inode
414 * @d_gh: An initialized holder for the directory glock
415 * @name: The name of the inode to look for
416 * @is_root: If 1, ignore the caller's permissions
417 * @i_gh: An uninitialized holder for the new inode glock
419 * There will always be a vnode (Linux VFS inode) for the d_gh inode unless
425 struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
426 int is_root, struct nameidata *nd)
428 struct super_block *sb = dir->i_sb;
429 struct gfs2_inode *dip = GFS2_I(dir);
430 struct gfs2_holder d_gh;
431 struct gfs2_inum_host inum;
434 struct inode *inode = NULL;
436 if (!name->len || name->len > GFS2_FNAMESIZE)
437 return ERR_PTR(-ENAMETOOLONG);
439 if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) ||
440 (name->len == 2 && memcmp(name->name, "..", 2) == 0 &&
441 dir == sb->s_root->d_inode)) {
446 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
448 return ERR_PTR(error);
451 error = permission(dir, MAY_EXEC, NULL);
456 error = gfs2_dir_search(dir, name, &inum, &type);
460 inode = gfs2_inode_lookup(sb, &inum, type);
463 gfs2_glock_dq_uninit(&d_gh);
464 if (error == -ENOENT)
469 static int pick_formal_ino_1(struct gfs2_sbd *sdp, u64 *formal_ino)
471 struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode);
472 struct buffer_head *bh;
473 struct gfs2_inum_range_host ir;
476 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
479 mutex_lock(&sdp->sd_inum_mutex);
481 error = gfs2_meta_inode_buffer(ip, &bh);
483 mutex_unlock(&sdp->sd_inum_mutex);
488 gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode));
491 *formal_ino = ir.ir_start++;
493 gfs2_trans_add_bh(ip->i_gl, bh, 1);
494 gfs2_inum_range_out(&ir,
495 bh->b_data + sizeof(struct gfs2_dinode));
497 mutex_unlock(&sdp->sd_inum_mutex);
504 mutex_unlock(&sdp->sd_inum_mutex);
510 static int pick_formal_ino_2(struct gfs2_sbd *sdp, u64 *formal_ino)
512 struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode);
513 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_inum_inode);
514 struct gfs2_holder gh;
515 struct buffer_head *bh;
516 struct gfs2_inum_range_host ir;
519 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
523 error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0);
526 mutex_lock(&sdp->sd_inum_mutex);
528 error = gfs2_meta_inode_buffer(ip, &bh);
532 gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode));
535 struct buffer_head *m_bh;
539 error = gfs2_meta_inode_buffer(m_ip, &m_bh);
543 z = *(__be64 *)(m_bh->b_data + sizeof(struct gfs2_dinode));
544 x = y = be64_to_cpu(z);
546 ir.ir_length = GFS2_INUM_QUANTUM;
547 x += GFS2_INUM_QUANTUM;
549 gfs2_consist_inode(m_ip);
551 gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1);
552 *(__be64 *)(m_bh->b_data + sizeof(struct gfs2_dinode)) = z;
557 *formal_ino = ir.ir_start++;
560 gfs2_trans_add_bh(ip->i_gl, bh, 1);
561 gfs2_inum_range_out(&ir, bh->b_data + sizeof(struct gfs2_dinode));
566 mutex_unlock(&sdp->sd_inum_mutex);
569 gfs2_glock_dq_uninit(&gh);
573 static int pick_formal_ino(struct gfs2_sbd *sdp, u64 *inum)
577 error = pick_formal_ino_1(sdp, inum);
581 error = pick_formal_ino_2(sdp, inum);
587 * create_ok - OK to create a new on-disk inode here?
588 * @dip: Directory in which dinode is to be created
589 * @name: Name of new dinode
595 static int create_ok(struct gfs2_inode *dip, const struct qstr *name,
600 error = permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL);
604 /* Don't create entries in an unlinked directory */
605 if (!dip->i_di.di_nlink)
608 error = gfs2_dir_search(&dip->i_inode, name, NULL, NULL);
619 if (dip->i_di.di_entries == (u32)-1)
621 if (S_ISDIR(mode) && dip->i_di.di_nlink == (u32)-1)
627 static void munge_mode_uid_gid(struct gfs2_inode *dip, unsigned int *mode,
628 unsigned int *uid, unsigned int *gid)
630 if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir &&
631 (dip->i_di.di_mode & S_ISUID) && dip->i_di.di_uid) {
634 else if (dip->i_di.di_uid != current->fsuid)
636 *uid = dip->i_di.di_uid;
638 *uid = current->fsuid;
640 if (dip->i_di.di_mode & S_ISGID) {
643 *gid = dip->i_di.di_gid;
645 *gid = current->fsgid;
648 static int alloc_dinode(struct gfs2_inode *dip, struct gfs2_inum_host *inum,
651 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
656 dip->i_alloc.al_requested = RES_DINODE;
657 error = gfs2_inplace_reserve(dip);
661 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS, 0);
665 inum->no_addr = gfs2_alloc_di(dip, generation);
670 gfs2_inplace_release(dip);
677 * init_dinode - Fill in a new dinode structure
678 * @dip: the directory this inode is being created in
679 * @gl: The glock covering the new inode
680 * @inum: the inode number
681 * @mode: the file permissions
687 static void init_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
688 const struct gfs2_inum_host *inum, unsigned int mode,
689 unsigned int uid, unsigned int gid,
690 const u64 *generation)
692 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
693 struct gfs2_dinode *di;
694 struct buffer_head *dibh;
696 dibh = gfs2_meta_new(gl, inum->no_addr);
697 gfs2_trans_add_bh(gl, dibh, 1);
698 gfs2_metatype_set(dibh, GFS2_METATYPE_DI, GFS2_FORMAT_DI);
699 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
700 di = (struct gfs2_dinode *)dibh->b_data;
702 di->di_num.no_formal_ino = cpu_to_be64(inum->no_formal_ino);
703 di->di_num.no_addr = cpu_to_be64(inum->no_addr);
704 di->di_mode = cpu_to_be32(mode);
705 di->di_uid = cpu_to_be32(uid);
706 di->di_gid = cpu_to_be32(gid);
707 di->di_nlink = cpu_to_be32(0);
708 di->di_size = cpu_to_be64(0);
709 di->di_blocks = cpu_to_be64(1);
710 di->di_atime = di->di_mtime = di->di_ctime = cpu_to_be64(get_seconds());
711 di->di_major = di->di_minor = cpu_to_be32(0);
712 di->di_goal_meta = di->di_goal_data = cpu_to_be64(inum->no_addr);
713 di->di_generation = cpu_to_be64(*generation);
714 di->di_flags = cpu_to_be32(0);
717 if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_JDATA) ||
718 gfs2_tune_get(sdp, gt_new_files_jdata))
719 di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA);
720 if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_DIRECTIO) ||
721 gfs2_tune_get(sdp, gt_new_files_directio))
722 di->di_flags |= cpu_to_be32(GFS2_DIF_DIRECTIO);
723 } else if (S_ISDIR(mode)) {
724 di->di_flags |= cpu_to_be32(dip->i_di.di_flags &
725 GFS2_DIF_INHERIT_DIRECTIO);
726 di->di_flags |= cpu_to_be32(dip->i_di.di_flags &
727 GFS2_DIF_INHERIT_JDATA);
731 di->di_payload_format = cpu_to_be32(0);
732 di->di_height = cpu_to_be32(0);
735 di->di_depth = cpu_to_be16(0);
736 di->di_entries = cpu_to_be32(0);
737 memset(&di->__pad4, 0, sizeof(di->__pad4));
738 di->di_eattr = cpu_to_be64(0);
739 memset(&di->di_reserved, 0, sizeof(di->di_reserved));
744 static int make_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
745 unsigned int mode, const struct gfs2_inum_host *inum,
746 const u64 *generation)
748 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
749 unsigned int uid, gid;
752 munge_mode_uid_gid(dip, &mode, &uid, &gid);
755 error = gfs2_quota_lock(dip, uid, gid);
759 error = gfs2_quota_check(dip, uid, gid);
763 error = gfs2_trans_begin(sdp, RES_DINODE + RES_QUOTA, 0);
767 init_dinode(dip, gl, inum, mode, uid, gid, generation);
768 gfs2_quota_change(dip, +1, uid, gid);
772 gfs2_quota_unlock(dip);
778 static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
779 struct gfs2_inode *ip)
781 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
782 struct gfs2_alloc *al;
784 struct buffer_head *dibh;
787 al = gfs2_alloc_get(dip);
789 error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
793 error = alloc_required = gfs2_diradd_alloc_required(&dip->i_inode, name);
794 if (alloc_required < 0)
796 if (alloc_required) {
797 error = gfs2_quota_check(dip, dip->i_di.di_uid,
800 goto fail_quota_locks;
802 al->al_requested = sdp->sd_max_dirres;
804 error = gfs2_inplace_reserve(dip);
806 goto fail_quota_locks;
808 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
809 al->al_rgd->rd_ri.ri_length +
811 RES_STATFS + RES_QUOTA, 0);
815 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
817 goto fail_quota_locks;
820 error = gfs2_dir_add(&dip->i_inode, name, &ip->i_num, IF2DT(ip->i_di.di_mode));
824 error = gfs2_meta_inode_buffer(ip, &dibh);
827 ip->i_di.di_nlink = 1;
828 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
829 gfs2_dinode_out(ip, dibh->b_data);
837 if (dip->i_alloc.al_rgd)
838 gfs2_inplace_release(dip);
841 gfs2_quota_unlock(dip);
848 static int gfs2_security_init(struct gfs2_inode *dip, struct gfs2_inode *ip)
854 struct gfs2_ea_request er;
856 err = security_inode_init_security(&ip->i_inode, &dip->i_inode,
857 &name, &value, &len);
860 if (err == -EOPNOTSUPP)
865 memset(&er, 0, sizeof(struct gfs2_ea_request));
867 er.er_type = GFS2_EATYPE_SECURITY;
870 er.er_name_len = strlen(name);
871 er.er_data_len = len;
873 err = gfs2_ea_set_i(ip, &er);
882 * gfs2_createi - Create a new inode
883 * @ghs: An array of two holders
884 * @name: The name of the new file
885 * @mode: the permissions on the new inode
887 * @ghs[0] is an initialized holder for the directory
888 * @ghs[1] is the holder for the inode lock
890 * If the return value is not NULL, the glocks on both the directory and the new
891 * file are held. A transaction has been started and an inplace reservation
897 struct inode *gfs2_createi(struct gfs2_holder *ghs, const struct qstr *name,
901 struct gfs2_inode *dip = ghs->gh_gl->gl_object;
902 struct inode *dir = &dip->i_inode;
903 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
904 struct gfs2_inum_host inum;
908 if (!name->len || name->len > GFS2_FNAMESIZE)
909 return ERR_PTR(-ENAMETOOLONG);
911 gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs);
912 error = gfs2_glock_nq(ghs);
916 error = create_ok(dip, name, mode);
920 error = pick_formal_ino(sdp, &inum.no_formal_ino);
924 error = alloc_dinode(dip, &inum, &generation);
928 if (inum.no_addr < dip->i_num.no_addr) {
931 error = gfs2_glock_nq_num(sdp, inum.no_addr,
932 &gfs2_inode_glops, LM_ST_EXCLUSIVE,
935 return ERR_PTR(error);
938 gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs);
939 error = gfs2_glock_nq(ghs);
941 gfs2_glock_dq_uninit(ghs + 1);
942 return ERR_PTR(error);
945 error = create_ok(dip, name, mode);
949 error = gfs2_glock_nq_num(sdp, inum.no_addr,
950 &gfs2_inode_glops, LM_ST_EXCLUSIVE,
956 error = make_dinode(dip, ghs[1].gh_gl, mode, &inum, &generation);
960 inode = gfs2_inode_lookup(dir->i_sb, &inum, IF2DT(mode));
964 error = gfs2_inode_refresh(GFS2_I(inode));
968 error = gfs2_acl_create(dip, GFS2_I(inode));
972 error = gfs2_security_init(dip, GFS2_I(inode));
976 error = link_dinode(dip, name, GFS2_I(inode));
981 return ERR_PTR(-ENOMEM);
987 gfs2_glock_dq_uninit(ghs + 1);
991 return ERR_PTR(error);
995 * gfs2_rmdiri - Remove a directory
996 * @dip: The parent directory of the directory to be removed
997 * @name: The name of the directory to be removed
998 * @ip: The GFS2 inode of the directory to be removed
1000 * Assumes Glocks on dip and ip are held
1005 int gfs2_rmdiri(struct gfs2_inode *dip, const struct qstr *name,
1006 struct gfs2_inode *ip)
1008 struct qstr dotname;
1011 if (ip->i_di.di_entries != 2) {
1012 if (gfs2_consist_inode(ip))
1013 gfs2_dinode_print(&ip->i_di);
1017 error = gfs2_dir_del(dip, name);
1021 error = gfs2_change_nlink(dip, -1);
1025 gfs2_str2qstr(&dotname, ".");
1026 error = gfs2_dir_del(ip, &dotname);
1030 gfs2_str2qstr(&dotname, "..");
1031 error = gfs2_dir_del(ip, &dotname);
1035 error = gfs2_change_nlink(ip, -2);
1043 * gfs2_unlink_ok - check to see that a inode is still in a directory
1044 * @dip: the directory
1045 * @name: the name of the file
1048 * Assumes that the lock on (at least) @dip is held.
1050 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
1053 int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
1054 struct gfs2_inode *ip)
1056 struct gfs2_inum_host inum;
1060 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
1063 if ((dip->i_di.di_mode & S_ISVTX) &&
1064 dip->i_di.di_uid != current->fsuid &&
1065 ip->i_di.di_uid != current->fsuid && !capable(CAP_FOWNER))
1068 if (IS_APPEND(&dip->i_inode))
1071 error = permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL);
1075 error = gfs2_dir_search(&dip->i_inode, name, &inum, &type);
1079 if (!gfs2_inum_equal(&inum, &ip->i_num))
1082 if (IF2DT(ip->i_di.di_mode) != type) {
1083 gfs2_consist_inode(dip);
1091 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1095 * Follow @to back to the root and make sure we don't encounter @this
1096 * Assumes we already hold the rename lock.
1101 int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1103 struct inode *dir = &to->i_inode;
1104 struct super_block *sb = dir->i_sb;
1109 gfs2_str2qstr(&dotdot, "..");
1114 if (dir == &this->i_inode) {
1118 if (dir == sb->s_root->d_inode) {
1123 tmp = gfs2_lookupi(dir, &dotdot, 1, NULL);
1125 error = PTR_ERR(tmp);
1139 * gfs2_readlinki - return the contents of a symlink
1140 * @ip: the symlink's inode
1141 * @buf: a pointer to the buffer to be filled
1142 * @len: a pointer to the length of @buf
1144 * If @buf is too small, a piece of memory is kmalloc()ed and needs
1145 * to be freed by the caller.
1150 int gfs2_readlinki(struct gfs2_inode *ip, char **buf, unsigned int *len)
1152 struct gfs2_holder i_gh;
1153 struct buffer_head *dibh;
1157 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &i_gh);
1158 error = gfs2_glock_nq_atime(&i_gh);
1160 gfs2_holder_uninit(&i_gh);
1164 if (!ip->i_di.di_size) {
1165 gfs2_consist_inode(ip);
1170 error = gfs2_meta_inode_buffer(ip, &dibh);
1174 x = ip->i_di.di_size + 1;
1176 *buf = kmalloc(x, GFP_KERNEL);
1183 memcpy(*buf, dibh->b_data + sizeof(struct gfs2_dinode), x);
1189 gfs2_glock_dq_uninit(&i_gh);
1194 * gfs2_glock_nq_atime - Acquire a hold on an inode's glock, and
1195 * conditionally update the inode's atime
1196 * @gh: the holder to acquire
1198 * Tests atime (access time) for gfs2_read, gfs2_readdir and gfs2_mmap
1199 * Update if the difference between the current time and the inode's current
1200 * atime is greater than an interval specified at mount.
1205 int gfs2_glock_nq_atime(struct gfs2_holder *gh)
1207 struct gfs2_glock *gl = gh->gh_gl;
1208 struct gfs2_sbd *sdp = gl->gl_sbd;
1209 struct gfs2_inode *ip = gl->gl_object;
1210 s64 curtime, quantum = gfs2_tune_get(sdp, gt_atime_quantum);
1215 if (gfs2_assert_warn(sdp, gh->gh_flags & GL_ATIME) ||
1216 gfs2_assert_warn(sdp, !(gh->gh_flags & GL_ASYNC)) ||
1217 gfs2_assert_warn(sdp, gl->gl_ops == &gfs2_inode_glops))
1220 state = gh->gh_state;
1221 flags = gh->gh_flags;
1223 error = gfs2_glock_nq(gh);
1227 if (test_bit(SDF_NOATIME, &sdp->sd_flags) ||
1228 (sdp->sd_vfs->s_flags & MS_RDONLY))
1231 curtime = get_seconds();
1232 if (curtime - ip->i_di.di_atime >= quantum) {
1234 gfs2_holder_reinit(LM_ST_EXCLUSIVE, gh->gh_flags & ~LM_FLAG_ANY,
1236 error = gfs2_glock_nq(gh);
1240 /* Verify that atime hasn't been updated while we were
1241 trying to get exclusive lock. */
1243 curtime = get_seconds();
1244 if (curtime - ip->i_di.di_atime >= quantum) {
1245 struct buffer_head *dibh;
1246 struct gfs2_dinode *di;
1248 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
1249 if (error == -EROFS)
1254 error = gfs2_meta_inode_buffer(ip, &dibh);
1256 goto fail_end_trans;
1258 ip->i_di.di_atime = curtime;
1260 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1261 di = (struct gfs2_dinode *)dibh->b_data;
1262 di->di_atime = cpu_to_be64(ip->i_di.di_atime);
1265 gfs2_trans_end(sdp);
1268 /* If someone else has asked for the glock,
1269 unlock and let them have it. Then reacquire
1270 in the original state. */
1271 if (gfs2_glock_is_blocking(gl)) {
1273 gfs2_holder_reinit(state, flags, gh);
1274 return gfs2_glock_nq(gh);
1281 gfs2_trans_end(sdp);
1288 * glock_compare_atime - Compare two struct gfs2_glock structures for sort
1289 * @arg_a: the first structure
1290 * @arg_b: the second structure
1292 * Returns: 1 if A > B
1297 static int glock_compare_atime(const void *arg_a, const void *arg_b)
1299 const struct gfs2_holder *gh_a = *(const struct gfs2_holder **)arg_a;
1300 const struct gfs2_holder *gh_b = *(const struct gfs2_holder **)arg_b;
1301 const struct lm_lockname *a = &gh_a->gh_gl->gl_name;
1302 const struct lm_lockname *b = &gh_b->gh_gl->gl_name;
1304 if (a->ln_number > b->ln_number)
1306 if (a->ln_number < b->ln_number)
1308 if (gh_a->gh_state == LM_ST_SHARED && gh_b->gh_state == LM_ST_EXCLUSIVE)
1310 if (gh_a->gh_state == LM_ST_SHARED && (gh_b->gh_flags & GL_ATIME))
1317 * gfs2_glock_nq_m_atime - acquire multiple glocks where one may need an
1319 * @num_gh: the number of structures
1320 * @ghs: an array of struct gfs2_holder structures
1322 * Returns: 0 on success (all glocks acquired),
1323 * errno on failure (no glocks acquired)
1326 int gfs2_glock_nq_m_atime(unsigned int num_gh, struct gfs2_holder *ghs)
1328 struct gfs2_holder **p;
1336 ghs->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC);
1337 if (ghs->gh_flags & GL_ATIME)
1338 error = gfs2_glock_nq_atime(ghs);
1340 error = gfs2_glock_nq(ghs);
1344 p = kcalloc(num_gh, sizeof(struct gfs2_holder *), GFP_KERNEL);
1348 for (x = 0; x < num_gh; x++)
1351 sort(p, num_gh, sizeof(struct gfs2_holder *), glock_compare_atime,NULL);
1353 for (x = 0; x < num_gh; x++) {
1354 p[x]->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC);
1356 if (p[x]->gh_flags & GL_ATIME)
1357 error = gfs2_glock_nq_atime(p[x]);
1359 error = gfs2_glock_nq(p[x]);
1363 gfs2_glock_dq(p[x]);
1374 __gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr)
1376 struct buffer_head *dibh;
1379 error = gfs2_meta_inode_buffer(ip, &dibh);
1381 error = inode_setattr(&ip->i_inode, attr);
1382 gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error);
1383 gfs2_inode_attr_out(ip);
1385 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1386 gfs2_dinode_out(ip, dibh->b_data);
1393 * gfs2_setattr_simple -
1397 * Called with a reference on the vnode.
1402 int gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr)
1406 if (current->journal_info)
1407 return __gfs2_setattr_simple(ip, attr);
1409 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE, 0);
1413 error = __gfs2_setattr_simple(ip, attr);
1414 gfs2_trans_end(GFS2_SB(&ip->i_inode));