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 int 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 if (ip->i_num.no_addr != be64_to_cpu(str->di_num.no_addr)) {
217 if (gfs2_consist_inode(ip))
218 gfs2_dinode_print(ip);
221 if (ip->i_num.no_formal_ino != be64_to_cpu(str->di_num.no_formal_ino))
224 di->di_mode = be32_to_cpu(str->di_mode);
225 di->di_uid = be32_to_cpu(str->di_uid);
226 di->di_gid = be32_to_cpu(str->di_gid);
227 di->di_nlink = be32_to_cpu(str->di_nlink);
228 di->di_size = be64_to_cpu(str->di_size);
229 di->di_blocks = be64_to_cpu(str->di_blocks);
230 di->di_atime = be64_to_cpu(str->di_atime);
231 di->di_mtime = be64_to_cpu(str->di_mtime);
232 di->di_ctime = be64_to_cpu(str->di_ctime);
233 di->di_major = be32_to_cpu(str->di_major);
234 di->di_minor = be32_to_cpu(str->di_minor);
236 di->di_goal_meta = be64_to_cpu(str->di_goal_meta);
237 di->di_goal_data = be64_to_cpu(str->di_goal_data);
238 di->di_generation = be64_to_cpu(str->di_generation);
240 di->di_flags = be32_to_cpu(str->di_flags);
241 di->di_payload_format = be32_to_cpu(str->di_payload_format);
242 di->di_height = be16_to_cpu(str->di_height);
244 di->di_depth = be16_to_cpu(str->di_depth);
245 di->di_entries = be32_to_cpu(str->di_entries);
247 di->di_eattr = be64_to_cpu(str->di_eattr);
252 * gfs2_inode_refresh - Refresh the incore copy of the dinode
253 * @ip: The GFS2 inode
258 int gfs2_inode_refresh(struct gfs2_inode *ip)
260 struct buffer_head *dibh;
263 error = gfs2_meta_inode_buffer(ip, &dibh);
267 if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), dibh, GFS2_METATYPE_DI)) {
272 error = gfs2_dinode_in(ip, dibh->b_data);
275 ip->i_vn = ip->i_gl->gl_vn;
280 int gfs2_dinode_dealloc(struct gfs2_inode *ip)
282 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
283 struct gfs2_alloc *al;
284 struct gfs2_rgrpd *rgd;
287 if (ip->i_di.di_blocks != 1) {
288 if (gfs2_consist_inode(ip))
289 gfs2_dinode_print(ip);
293 al = gfs2_alloc_get(ip);
295 error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
299 error = gfs2_rindex_hold(sdp, &al->al_ri_gh);
303 rgd = gfs2_blk2rgrpd(sdp, ip->i_num.no_addr);
305 gfs2_consist_inode(ip);
307 goto out_rindex_relse;
310 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0,
313 goto out_rindex_relse;
315 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA, 1);
319 gfs2_trans_add_gl(ip->i_gl);
321 gfs2_free_di(rgd, ip);
324 clear_bit(GLF_STICKY, &ip->i_gl->gl_flags);
327 gfs2_glock_dq_uninit(&al->al_rgd_gh);
329 gfs2_glock_dq_uninit(&al->al_ri_gh);
331 gfs2_quota_unhold(ip);
338 * gfs2_change_nlink - Change nlink count on inode
339 * @ip: The GFS2 inode
340 * @diff: The change in the nlink count required
345 int gfs2_change_nlink(struct gfs2_inode *ip, int diff)
347 struct gfs2_sbd *sdp = ip->i_inode.i_sb->s_fs_info;
348 struct buffer_head *dibh;
352 BUG_ON(ip->i_di.di_nlink != ip->i_inode.i_nlink);
353 nlink = ip->i_di.di_nlink + diff;
355 /* If we are reducing the nlink count, but the new value ends up being
356 bigger than the old one, we must have underflowed. */
357 if (diff < 0 && nlink > ip->i_di.di_nlink) {
358 if (gfs2_consist_inode(ip))
359 gfs2_dinode_print(ip);
363 error = gfs2_meta_inode_buffer(ip, &dibh);
367 ip->i_di.di_nlink = nlink;
368 ip->i_di.di_ctime = get_seconds();
369 ip->i_inode.i_nlink = nlink;
371 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
372 gfs2_dinode_out(ip, dibh->b_data);
374 mark_inode_dirty(&ip->i_inode);
376 if (ip->i_di.di_nlink == 0) {
377 struct gfs2_rgrpd *rgd;
378 struct gfs2_holder ri_gh, rg_gh;
380 error = gfs2_rindex_hold(sdp, &ri_gh);
384 rgd = gfs2_blk2rgrpd(sdp, ip->i_num.no_addr);
387 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &rg_gh);
391 clear_nlink(&ip->i_inode);
392 gfs2_unlink_di(&ip->i_inode); /* mark inode unlinked */
393 gfs2_glock_dq_uninit(&rg_gh);
395 gfs2_glock_dq_uninit(&ri_gh);
401 struct inode *gfs2_lookup_simple(struct inode *dip, const char *name)
404 gfs2_str2qstr(&qstr, name);
405 return gfs2_lookupi(dip, &qstr, 1, NULL);
410 * gfs2_lookupi - Look up a filename in a directory and return its inode
411 * @d_gh: An initialized holder for the directory glock
412 * @name: The name of the inode to look for
413 * @is_root: If 1, ignore the caller's permissions
414 * @i_gh: An uninitialized holder for the new inode glock
416 * There will always be a vnode (Linux VFS inode) for the d_gh inode unless
422 struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
423 int is_root, struct nameidata *nd)
425 struct super_block *sb = dir->i_sb;
426 struct gfs2_inode *dip = GFS2_I(dir);
427 struct gfs2_holder d_gh;
428 struct gfs2_inum_host inum;
431 struct inode *inode = NULL;
433 if (!name->len || name->len > GFS2_FNAMESIZE)
434 return ERR_PTR(-ENAMETOOLONG);
436 if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) ||
437 (name->len == 2 && memcmp(name->name, "..", 2) == 0 &&
438 dir == sb->s_root->d_inode)) {
443 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
445 return ERR_PTR(error);
448 error = permission(dir, MAY_EXEC, NULL);
453 error = gfs2_dir_search(dir, name, &inum, &type);
457 inode = gfs2_inode_lookup(sb, &inum, type);
460 gfs2_glock_dq_uninit(&d_gh);
461 if (error == -ENOENT)
466 static int pick_formal_ino_1(struct gfs2_sbd *sdp, u64 *formal_ino)
468 struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode);
469 struct buffer_head *bh;
470 struct gfs2_inum_range_host ir;
473 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
476 mutex_lock(&sdp->sd_inum_mutex);
478 error = gfs2_meta_inode_buffer(ip, &bh);
480 mutex_unlock(&sdp->sd_inum_mutex);
485 gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode));
488 *formal_ino = ir.ir_start++;
490 gfs2_trans_add_bh(ip->i_gl, bh, 1);
491 gfs2_inum_range_out(&ir,
492 bh->b_data + sizeof(struct gfs2_dinode));
494 mutex_unlock(&sdp->sd_inum_mutex);
501 mutex_unlock(&sdp->sd_inum_mutex);
507 static int pick_formal_ino_2(struct gfs2_sbd *sdp, u64 *formal_ino)
509 struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode);
510 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_inum_inode);
511 struct gfs2_holder gh;
512 struct buffer_head *bh;
513 struct gfs2_inum_range_host ir;
516 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
520 error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0);
523 mutex_lock(&sdp->sd_inum_mutex);
525 error = gfs2_meta_inode_buffer(ip, &bh);
529 gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode));
532 struct buffer_head *m_bh;
536 error = gfs2_meta_inode_buffer(m_ip, &m_bh);
540 z = *(__be64 *)(m_bh->b_data + sizeof(struct gfs2_dinode));
541 x = y = be64_to_cpu(z);
543 ir.ir_length = GFS2_INUM_QUANTUM;
544 x += GFS2_INUM_QUANTUM;
546 gfs2_consist_inode(m_ip);
548 gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1);
549 *(__be64 *)(m_bh->b_data + sizeof(struct gfs2_dinode)) = z;
554 *formal_ino = ir.ir_start++;
557 gfs2_trans_add_bh(ip->i_gl, bh, 1);
558 gfs2_inum_range_out(&ir, bh->b_data + sizeof(struct gfs2_dinode));
563 mutex_unlock(&sdp->sd_inum_mutex);
566 gfs2_glock_dq_uninit(&gh);
570 static int pick_formal_ino(struct gfs2_sbd *sdp, u64 *inum)
574 error = pick_formal_ino_1(sdp, inum);
578 error = pick_formal_ino_2(sdp, inum);
584 * create_ok - OK to create a new on-disk inode here?
585 * @dip: Directory in which dinode is to be created
586 * @name: Name of new dinode
592 static int create_ok(struct gfs2_inode *dip, const struct qstr *name,
597 error = permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL);
601 /* Don't create entries in an unlinked directory */
602 if (!dip->i_di.di_nlink)
605 error = gfs2_dir_search(&dip->i_inode, name, NULL, NULL);
616 if (dip->i_di.di_entries == (u32)-1)
618 if (S_ISDIR(mode) && dip->i_di.di_nlink == (u32)-1)
624 static void munge_mode_uid_gid(struct gfs2_inode *dip, unsigned int *mode,
625 unsigned int *uid, unsigned int *gid)
627 if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir &&
628 (dip->i_di.di_mode & S_ISUID) && dip->i_di.di_uid) {
631 else if (dip->i_di.di_uid != current->fsuid)
633 *uid = dip->i_di.di_uid;
635 *uid = current->fsuid;
637 if (dip->i_di.di_mode & S_ISGID) {
640 *gid = dip->i_di.di_gid;
642 *gid = current->fsgid;
645 static int alloc_dinode(struct gfs2_inode *dip, struct gfs2_inum_host *inum,
648 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
653 dip->i_alloc.al_requested = RES_DINODE;
654 error = gfs2_inplace_reserve(dip);
658 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS, 0);
662 inum->no_addr = gfs2_alloc_di(dip, generation);
667 gfs2_inplace_release(dip);
674 * init_dinode - Fill in a new dinode structure
675 * @dip: the directory this inode is being created in
676 * @gl: The glock covering the new inode
677 * @inum: the inode number
678 * @mode: the file permissions
684 static void init_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
685 const struct gfs2_inum_host *inum, unsigned int mode,
686 unsigned int uid, unsigned int gid,
687 const u64 *generation)
689 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
690 struct gfs2_dinode *di;
691 struct buffer_head *dibh;
693 dibh = gfs2_meta_new(gl, inum->no_addr);
694 gfs2_trans_add_bh(gl, dibh, 1);
695 gfs2_metatype_set(dibh, GFS2_METATYPE_DI, GFS2_FORMAT_DI);
696 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
697 di = (struct gfs2_dinode *)dibh->b_data;
699 di->di_num.no_formal_ino = cpu_to_be64(inum->no_formal_ino);
700 di->di_num.no_addr = cpu_to_be64(inum->no_addr);
701 di->di_mode = cpu_to_be32(mode);
702 di->di_uid = cpu_to_be32(uid);
703 di->di_gid = cpu_to_be32(gid);
704 di->di_nlink = cpu_to_be32(0);
705 di->di_size = cpu_to_be64(0);
706 di->di_blocks = cpu_to_be64(1);
707 di->di_atime = di->di_mtime = di->di_ctime = cpu_to_be64(get_seconds());
708 di->di_major = di->di_minor = cpu_to_be32(0);
709 di->di_goal_meta = di->di_goal_data = cpu_to_be64(inum->no_addr);
710 di->di_generation = cpu_to_be64(*generation);
711 di->di_flags = cpu_to_be32(0);
714 if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_JDATA) ||
715 gfs2_tune_get(sdp, gt_new_files_jdata))
716 di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA);
717 if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_DIRECTIO) ||
718 gfs2_tune_get(sdp, gt_new_files_directio))
719 di->di_flags |= cpu_to_be32(GFS2_DIF_DIRECTIO);
720 } else if (S_ISDIR(mode)) {
721 di->di_flags |= cpu_to_be32(dip->i_di.di_flags &
722 GFS2_DIF_INHERIT_DIRECTIO);
723 di->di_flags |= cpu_to_be32(dip->i_di.di_flags &
724 GFS2_DIF_INHERIT_JDATA);
728 di->di_payload_format = cpu_to_be32(0);
729 di->di_height = cpu_to_be32(0);
732 di->di_depth = cpu_to_be16(0);
733 di->di_entries = cpu_to_be32(0);
734 memset(&di->__pad4, 0, sizeof(di->__pad4));
735 di->di_eattr = cpu_to_be64(0);
736 memset(&di->di_reserved, 0, sizeof(di->di_reserved));
741 static int make_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
742 unsigned int mode, const struct gfs2_inum_host *inum,
743 const u64 *generation)
745 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
746 unsigned int uid, gid;
749 munge_mode_uid_gid(dip, &mode, &uid, &gid);
752 error = gfs2_quota_lock(dip, uid, gid);
756 error = gfs2_quota_check(dip, uid, gid);
760 error = gfs2_trans_begin(sdp, RES_DINODE + RES_QUOTA, 0);
764 init_dinode(dip, gl, inum, mode, uid, gid, generation);
765 gfs2_quota_change(dip, +1, uid, gid);
769 gfs2_quota_unlock(dip);
775 static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
776 struct gfs2_inode *ip)
778 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
779 struct gfs2_alloc *al;
781 struct buffer_head *dibh;
784 al = gfs2_alloc_get(dip);
786 error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
790 error = alloc_required = gfs2_diradd_alloc_required(&dip->i_inode, name);
791 if (alloc_required < 0)
793 if (alloc_required) {
794 error = gfs2_quota_check(dip, dip->i_di.di_uid,
797 goto fail_quota_locks;
799 al->al_requested = sdp->sd_max_dirres;
801 error = gfs2_inplace_reserve(dip);
803 goto fail_quota_locks;
805 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
806 al->al_rgd->rd_ri.ri_length +
808 RES_STATFS + RES_QUOTA, 0);
812 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
814 goto fail_quota_locks;
817 error = gfs2_dir_add(&dip->i_inode, name, &ip->i_num, IF2DT(ip->i_di.di_mode));
821 error = gfs2_meta_inode_buffer(ip, &dibh);
824 ip->i_di.di_nlink = 1;
825 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
826 gfs2_dinode_out(ip, dibh->b_data);
834 if (dip->i_alloc.al_rgd)
835 gfs2_inplace_release(dip);
838 gfs2_quota_unlock(dip);
845 static int gfs2_security_init(struct gfs2_inode *dip, struct gfs2_inode *ip)
851 struct gfs2_ea_request er;
853 err = security_inode_init_security(&ip->i_inode, &dip->i_inode,
854 &name, &value, &len);
857 if (err == -EOPNOTSUPP)
862 memset(&er, 0, sizeof(struct gfs2_ea_request));
864 er.er_type = GFS2_EATYPE_SECURITY;
867 er.er_name_len = strlen(name);
868 er.er_data_len = len;
870 err = gfs2_ea_set_i(ip, &er);
879 * gfs2_createi - Create a new inode
880 * @ghs: An array of two holders
881 * @name: The name of the new file
882 * @mode: the permissions on the new inode
884 * @ghs[0] is an initialized holder for the directory
885 * @ghs[1] is the holder for the inode lock
887 * If the return value is not NULL, the glocks on both the directory and the new
888 * file are held. A transaction has been started and an inplace reservation
894 struct inode *gfs2_createi(struct gfs2_holder *ghs, const struct qstr *name,
898 struct gfs2_inode *dip = ghs->gh_gl->gl_object;
899 struct inode *dir = &dip->i_inode;
900 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
901 struct gfs2_inum_host inum;
905 if (!name->len || name->len > GFS2_FNAMESIZE)
906 return ERR_PTR(-ENAMETOOLONG);
908 gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs);
909 error = gfs2_glock_nq(ghs);
913 error = create_ok(dip, name, mode);
917 error = pick_formal_ino(sdp, &inum.no_formal_ino);
921 error = alloc_dinode(dip, &inum, &generation);
925 if (inum.no_addr < dip->i_num.no_addr) {
928 error = gfs2_glock_nq_num(sdp, inum.no_addr,
929 &gfs2_inode_glops, LM_ST_EXCLUSIVE,
932 return ERR_PTR(error);
935 gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs);
936 error = gfs2_glock_nq(ghs);
938 gfs2_glock_dq_uninit(ghs + 1);
939 return ERR_PTR(error);
942 error = create_ok(dip, name, mode);
946 error = gfs2_glock_nq_num(sdp, inum.no_addr,
947 &gfs2_inode_glops, LM_ST_EXCLUSIVE,
953 error = make_dinode(dip, ghs[1].gh_gl, mode, &inum, &generation);
957 inode = gfs2_inode_lookup(dir->i_sb, &inum, IF2DT(mode));
961 error = gfs2_inode_refresh(GFS2_I(inode));
965 error = gfs2_acl_create(dip, GFS2_I(inode));
969 error = gfs2_security_init(dip, GFS2_I(inode));
973 error = link_dinode(dip, name, GFS2_I(inode));
978 return ERR_PTR(-ENOMEM);
984 gfs2_glock_dq_uninit(ghs + 1);
988 return ERR_PTR(error);
992 * gfs2_rmdiri - Remove a directory
993 * @dip: The parent directory of the directory to be removed
994 * @name: The name of the directory to be removed
995 * @ip: The GFS2 inode of the directory to be removed
997 * Assumes Glocks on dip and ip are held
1002 int gfs2_rmdiri(struct gfs2_inode *dip, const struct qstr *name,
1003 struct gfs2_inode *ip)
1005 struct qstr dotname;
1008 if (ip->i_di.di_entries != 2) {
1009 if (gfs2_consist_inode(ip))
1010 gfs2_dinode_print(ip);
1014 error = gfs2_dir_del(dip, name);
1018 error = gfs2_change_nlink(dip, -1);
1022 gfs2_str2qstr(&dotname, ".");
1023 error = gfs2_dir_del(ip, &dotname);
1027 gfs2_str2qstr(&dotname, "..");
1028 error = gfs2_dir_del(ip, &dotname);
1032 error = gfs2_change_nlink(ip, -2);
1040 * gfs2_unlink_ok - check to see that a inode is still in a directory
1041 * @dip: the directory
1042 * @name: the name of the file
1045 * Assumes that the lock on (at least) @dip is held.
1047 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
1050 int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
1051 struct gfs2_inode *ip)
1053 struct gfs2_inum_host inum;
1057 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
1060 if ((dip->i_di.di_mode & S_ISVTX) &&
1061 dip->i_di.di_uid != current->fsuid &&
1062 ip->i_di.di_uid != current->fsuid && !capable(CAP_FOWNER))
1065 if (IS_APPEND(&dip->i_inode))
1068 error = permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL);
1072 error = gfs2_dir_search(&dip->i_inode, name, &inum, &type);
1076 if (!gfs2_inum_equal(&inum, &ip->i_num))
1079 if (IF2DT(ip->i_di.di_mode) != type) {
1080 gfs2_consist_inode(dip);
1088 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1092 * Follow @to back to the root and make sure we don't encounter @this
1093 * Assumes we already hold the rename lock.
1098 int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1100 struct inode *dir = &to->i_inode;
1101 struct super_block *sb = dir->i_sb;
1106 gfs2_str2qstr(&dotdot, "..");
1111 if (dir == &this->i_inode) {
1115 if (dir == sb->s_root->d_inode) {
1120 tmp = gfs2_lookupi(dir, &dotdot, 1, NULL);
1122 error = PTR_ERR(tmp);
1136 * gfs2_readlinki - return the contents of a symlink
1137 * @ip: the symlink's inode
1138 * @buf: a pointer to the buffer to be filled
1139 * @len: a pointer to the length of @buf
1141 * If @buf is too small, a piece of memory is kmalloc()ed and needs
1142 * to be freed by the caller.
1147 int gfs2_readlinki(struct gfs2_inode *ip, char **buf, unsigned int *len)
1149 struct gfs2_holder i_gh;
1150 struct buffer_head *dibh;
1154 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &i_gh);
1155 error = gfs2_glock_nq_atime(&i_gh);
1157 gfs2_holder_uninit(&i_gh);
1161 if (!ip->i_di.di_size) {
1162 gfs2_consist_inode(ip);
1167 error = gfs2_meta_inode_buffer(ip, &dibh);
1171 x = ip->i_di.di_size + 1;
1173 *buf = kmalloc(x, GFP_KERNEL);
1180 memcpy(*buf, dibh->b_data + sizeof(struct gfs2_dinode), x);
1186 gfs2_glock_dq_uninit(&i_gh);
1191 * gfs2_glock_nq_atime - Acquire a hold on an inode's glock, and
1192 * conditionally update the inode's atime
1193 * @gh: the holder to acquire
1195 * Tests atime (access time) for gfs2_read, gfs2_readdir and gfs2_mmap
1196 * Update if the difference between the current time and the inode's current
1197 * atime is greater than an interval specified at mount.
1202 int gfs2_glock_nq_atime(struct gfs2_holder *gh)
1204 struct gfs2_glock *gl = gh->gh_gl;
1205 struct gfs2_sbd *sdp = gl->gl_sbd;
1206 struct gfs2_inode *ip = gl->gl_object;
1207 s64 curtime, quantum = gfs2_tune_get(sdp, gt_atime_quantum);
1212 if (gfs2_assert_warn(sdp, gh->gh_flags & GL_ATIME) ||
1213 gfs2_assert_warn(sdp, !(gh->gh_flags & GL_ASYNC)) ||
1214 gfs2_assert_warn(sdp, gl->gl_ops == &gfs2_inode_glops))
1217 state = gh->gh_state;
1218 flags = gh->gh_flags;
1220 error = gfs2_glock_nq(gh);
1224 if (test_bit(SDF_NOATIME, &sdp->sd_flags) ||
1225 (sdp->sd_vfs->s_flags & MS_RDONLY))
1228 curtime = get_seconds();
1229 if (curtime - ip->i_di.di_atime >= quantum) {
1231 gfs2_holder_reinit(LM_ST_EXCLUSIVE, gh->gh_flags & ~LM_FLAG_ANY,
1233 error = gfs2_glock_nq(gh);
1237 /* Verify that atime hasn't been updated while we were
1238 trying to get exclusive lock. */
1240 curtime = get_seconds();
1241 if (curtime - ip->i_di.di_atime >= quantum) {
1242 struct buffer_head *dibh;
1243 struct gfs2_dinode *di;
1245 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
1246 if (error == -EROFS)
1251 error = gfs2_meta_inode_buffer(ip, &dibh);
1253 goto fail_end_trans;
1255 ip->i_di.di_atime = curtime;
1257 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1258 di = (struct gfs2_dinode *)dibh->b_data;
1259 di->di_atime = cpu_to_be64(ip->i_di.di_atime);
1262 gfs2_trans_end(sdp);
1265 /* If someone else has asked for the glock,
1266 unlock and let them have it. Then reacquire
1267 in the original state. */
1268 if (gfs2_glock_is_blocking(gl)) {
1270 gfs2_holder_reinit(state, flags, gh);
1271 return gfs2_glock_nq(gh);
1278 gfs2_trans_end(sdp);
1285 * glock_compare_atime - Compare two struct gfs2_glock structures for sort
1286 * @arg_a: the first structure
1287 * @arg_b: the second structure
1289 * Returns: 1 if A > B
1294 static int glock_compare_atime(const void *arg_a, const void *arg_b)
1296 const struct gfs2_holder *gh_a = *(const struct gfs2_holder **)arg_a;
1297 const struct gfs2_holder *gh_b = *(const struct gfs2_holder **)arg_b;
1298 const struct lm_lockname *a = &gh_a->gh_gl->gl_name;
1299 const struct lm_lockname *b = &gh_b->gh_gl->gl_name;
1301 if (a->ln_number > b->ln_number)
1303 if (a->ln_number < b->ln_number)
1305 if (gh_a->gh_state == LM_ST_SHARED && gh_b->gh_state == LM_ST_EXCLUSIVE)
1307 if (gh_a->gh_state == LM_ST_SHARED && (gh_b->gh_flags & GL_ATIME))
1314 * gfs2_glock_nq_m_atime - acquire multiple glocks where one may need an
1316 * @num_gh: the number of structures
1317 * @ghs: an array of struct gfs2_holder structures
1319 * Returns: 0 on success (all glocks acquired),
1320 * errno on failure (no glocks acquired)
1323 int gfs2_glock_nq_m_atime(unsigned int num_gh, struct gfs2_holder *ghs)
1325 struct gfs2_holder **p;
1333 ghs->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC);
1334 if (ghs->gh_flags & GL_ATIME)
1335 error = gfs2_glock_nq_atime(ghs);
1337 error = gfs2_glock_nq(ghs);
1341 p = kcalloc(num_gh, sizeof(struct gfs2_holder *), GFP_KERNEL);
1345 for (x = 0; x < num_gh; x++)
1348 sort(p, num_gh, sizeof(struct gfs2_holder *), glock_compare_atime,NULL);
1350 for (x = 0; x < num_gh; x++) {
1351 p[x]->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC);
1353 if (p[x]->gh_flags & GL_ATIME)
1354 error = gfs2_glock_nq_atime(p[x]);
1356 error = gfs2_glock_nq(p[x]);
1360 gfs2_glock_dq(p[x]);
1371 __gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr)
1373 struct buffer_head *dibh;
1376 error = gfs2_meta_inode_buffer(ip, &dibh);
1378 error = inode_setattr(&ip->i_inode, attr);
1379 gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error);
1380 gfs2_inode_attr_out(ip);
1382 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1383 gfs2_dinode_out(ip, dibh->b_data);
1390 * gfs2_setattr_simple -
1394 * Called with a reference on the vnode.
1399 int gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr)
1403 if (current->journal_info)
1404 return __gfs2_setattr_simple(ip, attr);
1406 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE, 0);
1410 error = __gfs2_setattr_simple(ip, attr);
1411 gfs2_trans_end(GFS2_SB(&ip->i_inode));