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_nlink = di->di_nlink;
55 i_size_write(inode, di->di_size);
56 inode->i_atime.tv_sec = di->di_atime;
57 inode->i_mtime.tv_sec = di->di_mtime;
58 inode->i_ctime.tv_sec = di->di_ctime;
59 inode->i_atime.tv_nsec = 0;
60 inode->i_mtime.tv_nsec = 0;
61 inode->i_ctime.tv_nsec = 0;
62 inode->i_blocks = di->di_blocks <<
63 (GFS2_SB(inode)->sd_sb.sb_bsize_shift - GFS2_BASIC_BLOCK_SHIFT);
65 if (di->di_flags & GFS2_DIF_IMMUTABLE)
66 inode->i_flags |= S_IMMUTABLE;
68 inode->i_flags &= ~S_IMMUTABLE;
70 if (di->di_flags & GFS2_DIF_APPENDONLY)
71 inode->i_flags |= S_APPEND;
73 inode->i_flags &= ~S_APPEND;
77 * gfs2_inode_attr_out - Copy attributes from VFS inode into the dinode
80 * Only copy out the attributes that we want the VFS layer
81 * to be able to modify.
84 void gfs2_inode_attr_out(struct gfs2_inode *ip)
86 struct inode *inode = &ip->i_inode;
87 struct gfs2_dinode_host *di = &ip->i_di;
88 di->di_atime = inode->i_atime.tv_sec;
89 di->di_mtime = inode->i_mtime.tv_sec;
90 di->di_ctime = inode->i_ctime.tv_sec;
93 static int iget_test(struct inode *inode, void *opaque)
95 struct gfs2_inode *ip = GFS2_I(inode);
96 struct gfs2_inum_host *inum = opaque;
98 if (ip && ip->i_num.no_addr == inum->no_addr)
104 static int iget_set(struct inode *inode, void *opaque)
106 struct gfs2_inode *ip = GFS2_I(inode);
107 struct gfs2_inum_host *inum = opaque;
113 struct inode *gfs2_ilookup(struct super_block *sb, struct gfs2_inum_host *inum)
115 return ilookup5(sb, (unsigned long)inum->no_formal_ino,
119 static struct inode *gfs2_iget(struct super_block *sb, struct gfs2_inum_host *inum)
121 return iget5_locked(sb, (unsigned long)inum->no_formal_ino,
122 iget_test, iget_set, inum);
126 * gfs2_inode_lookup - Lookup an inode
127 * @sb: The super block
128 * @inum: The inode number
129 * @type: The type of the inode
131 * Returns: A VFS inode, or an error
134 struct inode *gfs2_inode_lookup(struct super_block *sb, struct gfs2_inum_host *inum, unsigned int type)
136 struct inode *inode = gfs2_iget(sb, inum);
137 struct gfs2_inode *ip = GFS2_I(inode);
138 struct gfs2_glock *io_gl;
142 return ERR_PTR(-ENOBUFS);
144 if (inode->i_state & I_NEW) {
145 struct gfs2_sbd *sdp = GFS2_SB(inode);
146 umode_t mode = DT2IF(type);
147 inode->i_private = ip;
148 inode->i_mode = mode;
151 inode->i_op = &gfs2_file_iops;
152 inode->i_fop = &gfs2_file_fops;
153 inode->i_mapping->a_ops = &gfs2_file_aops;
154 } else if (S_ISDIR(mode)) {
155 inode->i_op = &gfs2_dir_iops;
156 inode->i_fop = &gfs2_dir_fops;
157 } else if (S_ISLNK(mode)) {
158 inode->i_op = &gfs2_symlink_iops;
160 inode->i_op = &gfs2_dev_iops;
163 error = gfs2_glock_get(sdp, inum->no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
166 ip->i_gl->gl_object = ip;
168 error = gfs2_glock_get(sdp, inum->no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
172 ip->i_vn = ip->i_gl->gl_vn - 1;
173 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
177 gfs2_glock_put(io_gl);
178 unlock_new_inode(inode);
183 gfs2_glock_put(io_gl);
185 ip->i_gl->gl_object = NULL;
186 gfs2_glock_put(ip->i_gl);
189 return ERR_PTR(error);
192 static int gfs2_dinode_in(struct gfs2_inode *ip, const void *buf)
194 struct gfs2_dinode_host *di = &ip->i_di;
195 const struct gfs2_dinode *str = buf;
197 if (ip->i_num.no_addr != be64_to_cpu(str->di_num.no_addr)) {
198 if (gfs2_consist_inode(ip))
199 gfs2_dinode_print(ip);
202 if (ip->i_num.no_formal_ino != be64_to_cpu(str->di_num.no_formal_ino))
205 ip->i_inode.i_mode = be32_to_cpu(str->di_mode);
206 ip->i_inode.i_rdev = 0;
207 switch (ip->i_inode.i_mode & S_IFMT) {
210 ip->i_inode.i_rdev = MKDEV(be32_to_cpu(str->di_major),
211 be32_to_cpu(str->di_minor));
215 ip->i_inode.i_uid = be32_to_cpu(str->di_uid);
216 ip->i_inode.i_gid = be32_to_cpu(str->di_gid);
217 di->di_nlink = be32_to_cpu(str->di_nlink);
218 di->di_size = be64_to_cpu(str->di_size);
219 di->di_blocks = be64_to_cpu(str->di_blocks);
220 di->di_atime = be64_to_cpu(str->di_atime);
221 di->di_mtime = be64_to_cpu(str->di_mtime);
222 di->di_ctime = be64_to_cpu(str->di_ctime);
224 di->di_goal_meta = be64_to_cpu(str->di_goal_meta);
225 di->di_goal_data = be64_to_cpu(str->di_goal_data);
226 di->di_generation = be64_to_cpu(str->di_generation);
228 di->di_flags = be32_to_cpu(str->di_flags);
229 di->di_payload_format = be32_to_cpu(str->di_payload_format);
230 di->di_height = be16_to_cpu(str->di_height);
232 di->di_depth = be16_to_cpu(str->di_depth);
233 di->di_entries = be32_to_cpu(str->di_entries);
235 di->di_eattr = be64_to_cpu(str->di_eattr);
240 * gfs2_inode_refresh - Refresh the incore copy of the dinode
241 * @ip: The GFS2 inode
246 int gfs2_inode_refresh(struct gfs2_inode *ip)
248 struct buffer_head *dibh;
251 error = gfs2_meta_inode_buffer(ip, &dibh);
255 if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), dibh, GFS2_METATYPE_DI)) {
260 error = gfs2_dinode_in(ip, dibh->b_data);
262 ip->i_vn = ip->i_gl->gl_vn;
267 int gfs2_dinode_dealloc(struct gfs2_inode *ip)
269 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
270 struct gfs2_alloc *al;
271 struct gfs2_rgrpd *rgd;
274 if (ip->i_di.di_blocks != 1) {
275 if (gfs2_consist_inode(ip))
276 gfs2_dinode_print(ip);
280 al = gfs2_alloc_get(ip);
282 error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
286 error = gfs2_rindex_hold(sdp, &al->al_ri_gh);
290 rgd = gfs2_blk2rgrpd(sdp, ip->i_num.no_addr);
292 gfs2_consist_inode(ip);
294 goto out_rindex_relse;
297 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0,
300 goto out_rindex_relse;
302 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA, 1);
306 gfs2_trans_add_gl(ip->i_gl);
308 gfs2_free_di(rgd, ip);
311 clear_bit(GLF_STICKY, &ip->i_gl->gl_flags);
314 gfs2_glock_dq_uninit(&al->al_rgd_gh);
316 gfs2_glock_dq_uninit(&al->al_ri_gh);
318 gfs2_quota_unhold(ip);
325 * gfs2_change_nlink - Change nlink count on inode
326 * @ip: The GFS2 inode
327 * @diff: The change in the nlink count required
332 int gfs2_change_nlink(struct gfs2_inode *ip, int diff)
334 struct gfs2_sbd *sdp = ip->i_inode.i_sb->s_fs_info;
335 struct buffer_head *dibh;
339 BUG_ON(ip->i_di.di_nlink != ip->i_inode.i_nlink);
340 nlink = ip->i_di.di_nlink + diff;
342 /* If we are reducing the nlink count, but the new value ends up being
343 bigger than the old one, we must have underflowed. */
344 if (diff < 0 && nlink > ip->i_di.di_nlink) {
345 if (gfs2_consist_inode(ip))
346 gfs2_dinode_print(ip);
350 error = gfs2_meta_inode_buffer(ip, &dibh);
354 ip->i_di.di_nlink = nlink;
355 ip->i_di.di_ctime = get_seconds();
356 ip->i_inode.i_nlink = nlink;
358 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
359 gfs2_dinode_out(ip, dibh->b_data);
361 mark_inode_dirty(&ip->i_inode);
363 if (ip->i_di.di_nlink == 0) {
364 struct gfs2_rgrpd *rgd;
365 struct gfs2_holder ri_gh, rg_gh;
367 error = gfs2_rindex_hold(sdp, &ri_gh);
371 rgd = gfs2_blk2rgrpd(sdp, ip->i_num.no_addr);
374 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &rg_gh);
378 clear_nlink(&ip->i_inode);
379 gfs2_unlink_di(&ip->i_inode); /* mark inode unlinked */
380 gfs2_glock_dq_uninit(&rg_gh);
382 gfs2_glock_dq_uninit(&ri_gh);
388 struct inode *gfs2_lookup_simple(struct inode *dip, const char *name)
391 gfs2_str2qstr(&qstr, name);
392 return gfs2_lookupi(dip, &qstr, 1, NULL);
397 * gfs2_lookupi - Look up a filename in a directory and return its inode
398 * @d_gh: An initialized holder for the directory glock
399 * @name: The name of the inode to look for
400 * @is_root: If 1, ignore the caller's permissions
401 * @i_gh: An uninitialized holder for the new inode glock
403 * There will always be a vnode (Linux VFS inode) for the d_gh inode unless
409 struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
410 int is_root, struct nameidata *nd)
412 struct super_block *sb = dir->i_sb;
413 struct gfs2_inode *dip = GFS2_I(dir);
414 struct gfs2_holder d_gh;
415 struct gfs2_inum_host inum;
418 struct inode *inode = NULL;
420 if (!name->len || name->len > GFS2_FNAMESIZE)
421 return ERR_PTR(-ENAMETOOLONG);
423 if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) ||
424 (name->len == 2 && memcmp(name->name, "..", 2) == 0 &&
425 dir == sb->s_root->d_inode)) {
430 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
432 return ERR_PTR(error);
435 error = permission(dir, MAY_EXEC, NULL);
440 error = gfs2_dir_search(dir, name, &inum, &type);
444 inode = gfs2_inode_lookup(sb, &inum, type);
447 gfs2_glock_dq_uninit(&d_gh);
448 if (error == -ENOENT)
453 static int pick_formal_ino_1(struct gfs2_sbd *sdp, u64 *formal_ino)
455 struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode);
456 struct buffer_head *bh;
457 struct gfs2_inum_range_host ir;
460 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
463 mutex_lock(&sdp->sd_inum_mutex);
465 error = gfs2_meta_inode_buffer(ip, &bh);
467 mutex_unlock(&sdp->sd_inum_mutex);
472 gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode));
475 *formal_ino = ir.ir_start++;
477 gfs2_trans_add_bh(ip->i_gl, bh, 1);
478 gfs2_inum_range_out(&ir,
479 bh->b_data + sizeof(struct gfs2_dinode));
481 mutex_unlock(&sdp->sd_inum_mutex);
488 mutex_unlock(&sdp->sd_inum_mutex);
494 static int pick_formal_ino_2(struct gfs2_sbd *sdp, u64 *formal_ino)
496 struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode);
497 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_inum_inode);
498 struct gfs2_holder gh;
499 struct buffer_head *bh;
500 struct gfs2_inum_range_host ir;
503 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
507 error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0);
510 mutex_lock(&sdp->sd_inum_mutex);
512 error = gfs2_meta_inode_buffer(ip, &bh);
516 gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode));
519 struct buffer_head *m_bh;
523 error = gfs2_meta_inode_buffer(m_ip, &m_bh);
527 z = *(__be64 *)(m_bh->b_data + sizeof(struct gfs2_dinode));
528 x = y = be64_to_cpu(z);
530 ir.ir_length = GFS2_INUM_QUANTUM;
531 x += GFS2_INUM_QUANTUM;
533 gfs2_consist_inode(m_ip);
535 gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1);
536 *(__be64 *)(m_bh->b_data + sizeof(struct gfs2_dinode)) = z;
541 *formal_ino = ir.ir_start++;
544 gfs2_trans_add_bh(ip->i_gl, bh, 1);
545 gfs2_inum_range_out(&ir, bh->b_data + sizeof(struct gfs2_dinode));
550 mutex_unlock(&sdp->sd_inum_mutex);
553 gfs2_glock_dq_uninit(&gh);
557 static int pick_formal_ino(struct gfs2_sbd *sdp, u64 *inum)
561 error = pick_formal_ino_1(sdp, inum);
565 error = pick_formal_ino_2(sdp, inum);
571 * create_ok - OK to create a new on-disk inode here?
572 * @dip: Directory in which dinode is to be created
573 * @name: Name of new dinode
579 static int create_ok(struct gfs2_inode *dip, const struct qstr *name,
584 error = permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL);
588 /* Don't create entries in an unlinked directory */
589 if (!dip->i_di.di_nlink)
592 error = gfs2_dir_search(&dip->i_inode, name, NULL, NULL);
603 if (dip->i_di.di_entries == (u32)-1)
605 if (S_ISDIR(mode) && dip->i_di.di_nlink == (u32)-1)
611 static void munge_mode_uid_gid(struct gfs2_inode *dip, unsigned int *mode,
612 unsigned int *uid, unsigned int *gid)
614 if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir &&
615 (dip->i_inode.i_mode & S_ISUID) && dip->i_inode.i_uid) {
618 else if (dip->i_inode.i_uid != current->fsuid)
620 *uid = dip->i_inode.i_uid;
622 *uid = current->fsuid;
624 if (dip->i_inode.i_mode & S_ISGID) {
627 *gid = dip->i_inode.i_gid;
629 *gid = current->fsgid;
632 static int alloc_dinode(struct gfs2_inode *dip, struct gfs2_inum_host *inum,
635 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
640 dip->i_alloc.al_requested = RES_DINODE;
641 error = gfs2_inplace_reserve(dip);
645 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS, 0);
649 inum->no_addr = gfs2_alloc_di(dip, generation);
654 gfs2_inplace_release(dip);
661 * init_dinode - Fill in a new dinode structure
662 * @dip: the directory this inode is being created in
663 * @gl: The glock covering the new inode
664 * @inum: the inode number
665 * @mode: the file permissions
671 static void init_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
672 const struct gfs2_inum_host *inum, unsigned int mode,
673 unsigned int uid, unsigned int gid,
674 const u64 *generation, dev_t dev)
676 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
677 struct gfs2_dinode *di;
678 struct buffer_head *dibh;
680 dibh = gfs2_meta_new(gl, inum->no_addr);
681 gfs2_trans_add_bh(gl, dibh, 1);
682 gfs2_metatype_set(dibh, GFS2_METATYPE_DI, GFS2_FORMAT_DI);
683 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
684 di = (struct gfs2_dinode *)dibh->b_data;
686 di->di_num.no_formal_ino = cpu_to_be64(inum->no_formal_ino);
687 di->di_num.no_addr = cpu_to_be64(inum->no_addr);
688 di->di_mode = cpu_to_be32(mode);
689 di->di_uid = cpu_to_be32(uid);
690 di->di_gid = cpu_to_be32(gid);
691 di->di_nlink = cpu_to_be32(0);
692 di->di_size = cpu_to_be64(0);
693 di->di_blocks = cpu_to_be64(1);
694 di->di_atime = di->di_mtime = di->di_ctime = cpu_to_be64(get_seconds());
695 di->di_major = cpu_to_be32(MAJOR(dev));
696 di->di_minor = cpu_to_be32(MINOR(dev));
697 di->di_goal_meta = di->di_goal_data = cpu_to_be64(inum->no_addr);
698 di->di_generation = cpu_to_be64(*generation);
699 di->di_flags = cpu_to_be32(0);
702 if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_JDATA) ||
703 gfs2_tune_get(sdp, gt_new_files_jdata))
704 di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA);
705 if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_DIRECTIO) ||
706 gfs2_tune_get(sdp, gt_new_files_directio))
707 di->di_flags |= cpu_to_be32(GFS2_DIF_DIRECTIO);
708 } else if (S_ISDIR(mode)) {
709 di->di_flags |= cpu_to_be32(dip->i_di.di_flags &
710 GFS2_DIF_INHERIT_DIRECTIO);
711 di->di_flags |= cpu_to_be32(dip->i_di.di_flags &
712 GFS2_DIF_INHERIT_JDATA);
716 di->di_payload_format = cpu_to_be32(0);
717 di->di_height = cpu_to_be32(0);
720 di->di_depth = cpu_to_be16(0);
721 di->di_entries = cpu_to_be32(0);
722 memset(&di->__pad4, 0, sizeof(di->__pad4));
723 di->di_eattr = cpu_to_be64(0);
724 memset(&di->di_reserved, 0, sizeof(di->di_reserved));
729 static int make_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
730 unsigned int mode, const struct gfs2_inum_host *inum,
731 const u64 *generation, dev_t dev)
733 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
734 unsigned int uid, gid;
737 munge_mode_uid_gid(dip, &mode, &uid, &gid);
740 error = gfs2_quota_lock(dip, uid, gid);
744 error = gfs2_quota_check(dip, uid, gid);
748 error = gfs2_trans_begin(sdp, RES_DINODE + RES_QUOTA, 0);
752 init_dinode(dip, gl, inum, mode, uid, gid, generation, dev);
753 gfs2_quota_change(dip, +1, uid, gid);
757 gfs2_quota_unlock(dip);
763 static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
764 struct gfs2_inode *ip)
766 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
767 struct gfs2_alloc *al;
769 struct buffer_head *dibh;
772 al = gfs2_alloc_get(dip);
774 error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
778 error = alloc_required = gfs2_diradd_alloc_required(&dip->i_inode, name);
779 if (alloc_required < 0)
781 if (alloc_required) {
782 error = gfs2_quota_check(dip, dip->i_inode.i_uid, dip->i_inode.i_gid);
784 goto fail_quota_locks;
786 al->al_requested = sdp->sd_max_dirres;
788 error = gfs2_inplace_reserve(dip);
790 goto fail_quota_locks;
792 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
793 al->al_rgd->rd_ri.ri_length +
795 RES_STATFS + RES_QUOTA, 0);
799 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
801 goto fail_quota_locks;
804 error = gfs2_dir_add(&dip->i_inode, name, &ip->i_num, IF2DT(ip->i_inode.i_mode));
808 error = gfs2_meta_inode_buffer(ip, &dibh);
811 ip->i_di.di_nlink = 1;
812 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
813 gfs2_dinode_out(ip, dibh->b_data);
821 if (dip->i_alloc.al_rgd)
822 gfs2_inplace_release(dip);
825 gfs2_quota_unlock(dip);
832 static int gfs2_security_init(struct gfs2_inode *dip, struct gfs2_inode *ip)
838 struct gfs2_ea_request er;
840 err = security_inode_init_security(&ip->i_inode, &dip->i_inode,
841 &name, &value, &len);
844 if (err == -EOPNOTSUPP)
849 memset(&er, 0, sizeof(struct gfs2_ea_request));
851 er.er_type = GFS2_EATYPE_SECURITY;
854 er.er_name_len = strlen(name);
855 er.er_data_len = len;
857 err = gfs2_ea_set_i(ip, &er);
866 * gfs2_createi - Create a new inode
867 * @ghs: An array of two holders
868 * @name: The name of the new file
869 * @mode: the permissions on the new inode
871 * @ghs[0] is an initialized holder for the directory
872 * @ghs[1] is the holder for the inode lock
874 * If the return value is not NULL, the glocks on both the directory and the new
875 * file are held. A transaction has been started and an inplace reservation
881 struct inode *gfs2_createi(struct gfs2_holder *ghs, const struct qstr *name,
882 unsigned int mode, dev_t dev)
885 struct gfs2_inode *dip = ghs->gh_gl->gl_object;
886 struct inode *dir = &dip->i_inode;
887 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
888 struct gfs2_inum_host inum;
892 if (!name->len || name->len > GFS2_FNAMESIZE)
893 return ERR_PTR(-ENAMETOOLONG);
895 gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs);
896 error = gfs2_glock_nq(ghs);
900 error = create_ok(dip, name, mode);
904 error = pick_formal_ino(sdp, &inum.no_formal_ino);
908 error = alloc_dinode(dip, &inum, &generation);
912 if (inum.no_addr < dip->i_num.no_addr) {
915 error = gfs2_glock_nq_num(sdp, inum.no_addr,
916 &gfs2_inode_glops, LM_ST_EXCLUSIVE,
919 return ERR_PTR(error);
922 gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs);
923 error = gfs2_glock_nq(ghs);
925 gfs2_glock_dq_uninit(ghs + 1);
926 return ERR_PTR(error);
929 error = create_ok(dip, name, mode);
933 error = gfs2_glock_nq_num(sdp, inum.no_addr,
934 &gfs2_inode_glops, LM_ST_EXCLUSIVE,
940 error = make_dinode(dip, ghs[1].gh_gl, mode, &inum, &generation, dev);
944 inode = gfs2_inode_lookup(dir->i_sb, &inum, IF2DT(mode));
948 error = gfs2_inode_refresh(GFS2_I(inode));
952 error = gfs2_acl_create(dip, GFS2_I(inode));
956 error = gfs2_security_init(dip, GFS2_I(inode));
960 error = link_dinode(dip, name, GFS2_I(inode));
965 return ERR_PTR(-ENOMEM);
971 gfs2_glock_dq_uninit(ghs + 1);
975 return ERR_PTR(error);
979 * gfs2_rmdiri - Remove a directory
980 * @dip: The parent directory of the directory to be removed
981 * @name: The name of the directory to be removed
982 * @ip: The GFS2 inode of the directory to be removed
984 * Assumes Glocks on dip and ip are held
989 int gfs2_rmdiri(struct gfs2_inode *dip, const struct qstr *name,
990 struct gfs2_inode *ip)
995 if (ip->i_di.di_entries != 2) {
996 if (gfs2_consist_inode(ip))
997 gfs2_dinode_print(ip);
1001 error = gfs2_dir_del(dip, name);
1005 error = gfs2_change_nlink(dip, -1);
1009 gfs2_str2qstr(&dotname, ".");
1010 error = gfs2_dir_del(ip, &dotname);
1014 gfs2_str2qstr(&dotname, "..");
1015 error = gfs2_dir_del(ip, &dotname);
1019 error = gfs2_change_nlink(ip, -2);
1027 * gfs2_unlink_ok - check to see that a inode is still in a directory
1028 * @dip: the directory
1029 * @name: the name of the file
1032 * Assumes that the lock on (at least) @dip is held.
1034 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
1037 int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
1038 struct gfs2_inode *ip)
1040 struct gfs2_inum_host inum;
1044 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
1047 if ((dip->i_inode.i_mode & S_ISVTX) &&
1048 dip->i_inode.i_uid != current->fsuid &&
1049 ip->i_inode.i_uid != current->fsuid && !capable(CAP_FOWNER))
1052 if (IS_APPEND(&dip->i_inode))
1055 error = permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL);
1059 error = gfs2_dir_search(&dip->i_inode, name, &inum, &type);
1063 if (!gfs2_inum_equal(&inum, &ip->i_num))
1066 if (IF2DT(ip->i_inode.i_mode) != type) {
1067 gfs2_consist_inode(dip);
1075 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1079 * Follow @to back to the root and make sure we don't encounter @this
1080 * Assumes we already hold the rename lock.
1085 int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1087 struct inode *dir = &to->i_inode;
1088 struct super_block *sb = dir->i_sb;
1093 gfs2_str2qstr(&dotdot, "..");
1098 if (dir == &this->i_inode) {
1102 if (dir == sb->s_root->d_inode) {
1107 tmp = gfs2_lookupi(dir, &dotdot, 1, NULL);
1109 error = PTR_ERR(tmp);
1123 * gfs2_readlinki - return the contents of a symlink
1124 * @ip: the symlink's inode
1125 * @buf: a pointer to the buffer to be filled
1126 * @len: a pointer to the length of @buf
1128 * If @buf is too small, a piece of memory is kmalloc()ed and needs
1129 * to be freed by the caller.
1134 int gfs2_readlinki(struct gfs2_inode *ip, char **buf, unsigned int *len)
1136 struct gfs2_holder i_gh;
1137 struct buffer_head *dibh;
1141 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &i_gh);
1142 error = gfs2_glock_nq_atime(&i_gh);
1144 gfs2_holder_uninit(&i_gh);
1148 if (!ip->i_di.di_size) {
1149 gfs2_consist_inode(ip);
1154 error = gfs2_meta_inode_buffer(ip, &dibh);
1158 x = ip->i_di.di_size + 1;
1160 *buf = kmalloc(x, GFP_KERNEL);
1167 memcpy(*buf, dibh->b_data + sizeof(struct gfs2_dinode), x);
1173 gfs2_glock_dq_uninit(&i_gh);
1178 * gfs2_glock_nq_atime - Acquire a hold on an inode's glock, and
1179 * conditionally update the inode's atime
1180 * @gh: the holder to acquire
1182 * Tests atime (access time) for gfs2_read, gfs2_readdir and gfs2_mmap
1183 * Update if the difference between the current time and the inode's current
1184 * atime is greater than an interval specified at mount.
1189 int gfs2_glock_nq_atime(struct gfs2_holder *gh)
1191 struct gfs2_glock *gl = gh->gh_gl;
1192 struct gfs2_sbd *sdp = gl->gl_sbd;
1193 struct gfs2_inode *ip = gl->gl_object;
1194 s64 curtime, quantum = gfs2_tune_get(sdp, gt_atime_quantum);
1199 if (gfs2_assert_warn(sdp, gh->gh_flags & GL_ATIME) ||
1200 gfs2_assert_warn(sdp, !(gh->gh_flags & GL_ASYNC)) ||
1201 gfs2_assert_warn(sdp, gl->gl_ops == &gfs2_inode_glops))
1204 state = gh->gh_state;
1205 flags = gh->gh_flags;
1207 error = gfs2_glock_nq(gh);
1211 if (test_bit(SDF_NOATIME, &sdp->sd_flags) ||
1212 (sdp->sd_vfs->s_flags & MS_RDONLY))
1215 curtime = get_seconds();
1216 if (curtime - ip->i_di.di_atime >= quantum) {
1218 gfs2_holder_reinit(LM_ST_EXCLUSIVE, gh->gh_flags & ~LM_FLAG_ANY,
1220 error = gfs2_glock_nq(gh);
1224 /* Verify that atime hasn't been updated while we were
1225 trying to get exclusive lock. */
1227 curtime = get_seconds();
1228 if (curtime - ip->i_di.di_atime >= quantum) {
1229 struct buffer_head *dibh;
1230 struct gfs2_dinode *di;
1232 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
1233 if (error == -EROFS)
1238 error = gfs2_meta_inode_buffer(ip, &dibh);
1240 goto fail_end_trans;
1242 ip->i_di.di_atime = curtime;
1244 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1245 di = (struct gfs2_dinode *)dibh->b_data;
1246 di->di_atime = cpu_to_be64(ip->i_di.di_atime);
1249 gfs2_trans_end(sdp);
1252 /* If someone else has asked for the glock,
1253 unlock and let them have it. Then reacquire
1254 in the original state. */
1255 if (gfs2_glock_is_blocking(gl)) {
1257 gfs2_holder_reinit(state, flags, gh);
1258 return gfs2_glock_nq(gh);
1265 gfs2_trans_end(sdp);
1272 * glock_compare_atime - Compare two struct gfs2_glock structures for sort
1273 * @arg_a: the first structure
1274 * @arg_b: the second structure
1276 * Returns: 1 if A > B
1281 static int glock_compare_atime(const void *arg_a, const void *arg_b)
1283 const struct gfs2_holder *gh_a = *(const struct gfs2_holder **)arg_a;
1284 const struct gfs2_holder *gh_b = *(const struct gfs2_holder **)arg_b;
1285 const struct lm_lockname *a = &gh_a->gh_gl->gl_name;
1286 const struct lm_lockname *b = &gh_b->gh_gl->gl_name;
1288 if (a->ln_number > b->ln_number)
1290 if (a->ln_number < b->ln_number)
1292 if (gh_a->gh_state == LM_ST_SHARED && gh_b->gh_state == LM_ST_EXCLUSIVE)
1294 if (gh_a->gh_state == LM_ST_SHARED && (gh_b->gh_flags & GL_ATIME))
1301 * gfs2_glock_nq_m_atime - acquire multiple glocks where one may need an
1303 * @num_gh: the number of structures
1304 * @ghs: an array of struct gfs2_holder structures
1306 * Returns: 0 on success (all glocks acquired),
1307 * errno on failure (no glocks acquired)
1310 int gfs2_glock_nq_m_atime(unsigned int num_gh, struct gfs2_holder *ghs)
1312 struct gfs2_holder **p;
1320 ghs->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC);
1321 if (ghs->gh_flags & GL_ATIME)
1322 error = gfs2_glock_nq_atime(ghs);
1324 error = gfs2_glock_nq(ghs);
1328 p = kcalloc(num_gh, sizeof(struct gfs2_holder *), GFP_KERNEL);
1332 for (x = 0; x < num_gh; x++)
1335 sort(p, num_gh, sizeof(struct gfs2_holder *), glock_compare_atime,NULL);
1337 for (x = 0; x < num_gh; x++) {
1338 p[x]->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC);
1340 if (p[x]->gh_flags & GL_ATIME)
1341 error = gfs2_glock_nq_atime(p[x]);
1343 error = gfs2_glock_nq(p[x]);
1347 gfs2_glock_dq(p[x]);
1358 __gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr)
1360 struct buffer_head *dibh;
1363 error = gfs2_meta_inode_buffer(ip, &dibh);
1365 error = inode_setattr(&ip->i_inode, attr);
1366 gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error);
1367 gfs2_inode_attr_out(ip);
1369 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1370 gfs2_dinode_out(ip, dibh->b_data);
1377 * gfs2_setattr_simple -
1381 * Called with a reference on the vnode.
1386 int gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr)
1390 if (current->journal_info)
1391 return __gfs2_setattr_simple(ip, attr);
1393 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE, 0);
1397 error = __gfs2_setattr_simple(ip, attr);
1398 gfs2_trans_end(GFS2_SB(&ip->i_inode));