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_atime.tv_sec = di->di_atime;
56 inode->i_mtime.tv_sec = di->di_mtime;
57 inode->i_ctime.tv_sec = di->di_ctime;
58 inode->i_atime.tv_nsec = 0;
59 inode->i_mtime.tv_nsec = 0;
60 inode->i_ctime.tv_nsec = 0;
61 inode->i_blocks = di->di_blocks <<
62 (GFS2_SB(inode)->sd_sb.sb_bsize_shift - GFS2_BASIC_BLOCK_SHIFT);
64 if (di->di_flags & GFS2_DIF_IMMUTABLE)
65 inode->i_flags |= S_IMMUTABLE;
67 inode->i_flags &= ~S_IMMUTABLE;
69 if (di->di_flags & GFS2_DIF_APPENDONLY)
70 inode->i_flags |= S_APPEND;
72 inode->i_flags &= ~S_APPEND;
76 * gfs2_inode_attr_out - Copy attributes from VFS inode into the dinode
79 * Only copy out the attributes that we want the VFS layer
80 * to be able to modify.
83 void gfs2_inode_attr_out(struct gfs2_inode *ip)
85 struct inode *inode = &ip->i_inode;
86 struct gfs2_dinode_host *di = &ip->i_di;
87 di->di_atime = inode->i_atime.tv_sec;
88 di->di_mtime = inode->i_mtime.tv_sec;
89 di->di_ctime = inode->i_ctime.tv_sec;
92 static int iget_test(struct inode *inode, void *opaque)
94 struct gfs2_inode *ip = GFS2_I(inode);
95 struct gfs2_inum_host *inum = opaque;
97 if (ip && ip->i_num.no_addr == inum->no_addr)
103 static int iget_set(struct inode *inode, void *opaque)
105 struct gfs2_inode *ip = GFS2_I(inode);
106 struct gfs2_inum_host *inum = opaque;
112 struct inode *gfs2_ilookup(struct super_block *sb, struct gfs2_inum_host *inum)
114 return ilookup5(sb, (unsigned long)inum->no_formal_ino,
118 static struct inode *gfs2_iget(struct super_block *sb, struct gfs2_inum_host *inum)
120 return iget5_locked(sb, (unsigned long)inum->no_formal_ino,
121 iget_test, iget_set, inum);
125 * gfs2_inode_lookup - Lookup an inode
126 * @sb: The super block
127 * @inum: The inode number
128 * @type: The type of the inode
130 * Returns: A VFS inode, or an error
133 struct inode *gfs2_inode_lookup(struct super_block *sb, struct gfs2_inum_host *inum, unsigned int type)
135 struct inode *inode = gfs2_iget(sb, inum);
136 struct gfs2_inode *ip = GFS2_I(inode);
137 struct gfs2_glock *io_gl;
141 return ERR_PTR(-ENOBUFS);
143 if (inode->i_state & I_NEW) {
144 struct gfs2_sbd *sdp = GFS2_SB(inode);
145 umode_t mode = DT2IF(type);
146 inode->i_private = ip;
147 inode->i_mode = mode;
150 inode->i_op = &gfs2_file_iops;
151 inode->i_fop = &gfs2_file_fops;
152 inode->i_mapping->a_ops = &gfs2_file_aops;
153 } else if (S_ISDIR(mode)) {
154 inode->i_op = &gfs2_dir_iops;
155 inode->i_fop = &gfs2_dir_fops;
156 } else if (S_ISLNK(mode)) {
157 inode->i_op = &gfs2_symlink_iops;
159 inode->i_op = &gfs2_dev_iops;
162 error = gfs2_glock_get(sdp, inum->no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
165 ip->i_gl->gl_object = ip;
167 error = gfs2_glock_get(sdp, inum->no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
171 ip->i_vn = ip->i_gl->gl_vn - 1;
172 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
176 gfs2_glock_put(io_gl);
177 unlock_new_inode(inode);
182 gfs2_glock_put(io_gl);
184 ip->i_gl->gl_object = NULL;
185 gfs2_glock_put(ip->i_gl);
188 return ERR_PTR(error);
191 static int gfs2_dinode_in(struct gfs2_inode *ip, const void *buf)
193 struct gfs2_dinode_host *di = &ip->i_di;
194 const struct gfs2_dinode *str = buf;
196 if (ip->i_num.no_addr != be64_to_cpu(str->di_num.no_addr)) {
197 if (gfs2_consist_inode(ip))
198 gfs2_dinode_print(ip);
201 if (ip->i_num.no_formal_ino != be64_to_cpu(str->di_num.no_formal_ino))
204 ip->i_inode.i_mode = be32_to_cpu(str->di_mode);
205 ip->i_inode.i_rdev = 0;
206 switch (ip->i_inode.i_mode & S_IFMT) {
209 ip->i_inode.i_rdev = MKDEV(be32_to_cpu(str->di_major),
210 be32_to_cpu(str->di_minor));
214 ip->i_inode.i_uid = be32_to_cpu(str->di_uid);
215 ip->i_inode.i_gid = be32_to_cpu(str->di_gid);
217 * We will need to review setting the nlink count here in the
218 * light of the forthcoming ro bind mount work. This is a reminder
221 ip->i_inode.i_nlink = be32_to_cpu(str->di_nlink);
222 di->di_size = be64_to_cpu(str->di_size);
223 di->di_blocks = be64_to_cpu(str->di_blocks);
224 di->di_atime = be64_to_cpu(str->di_atime);
225 di->di_mtime = be64_to_cpu(str->di_mtime);
226 di->di_ctime = be64_to_cpu(str->di_ctime);
228 di->di_goal_meta = be64_to_cpu(str->di_goal_meta);
229 di->di_goal_data = be64_to_cpu(str->di_goal_data);
230 di->di_generation = be64_to_cpu(str->di_generation);
232 di->di_flags = be32_to_cpu(str->di_flags);
233 di->di_payload_format = be32_to_cpu(str->di_payload_format);
234 di->di_height = be16_to_cpu(str->di_height);
236 di->di_depth = be16_to_cpu(str->di_depth);
237 di->di_entries = be32_to_cpu(str->di_entries);
239 di->di_eattr = be64_to_cpu(str->di_eattr);
244 * gfs2_inode_refresh - Refresh the incore copy of the dinode
245 * @ip: The GFS2 inode
250 int gfs2_inode_refresh(struct gfs2_inode *ip)
252 struct buffer_head *dibh;
255 error = gfs2_meta_inode_buffer(ip, &dibh);
259 if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), dibh, GFS2_METATYPE_DI)) {
264 error = gfs2_dinode_in(ip, dibh->b_data);
266 ip->i_vn = ip->i_gl->gl_vn;
271 int gfs2_dinode_dealloc(struct gfs2_inode *ip)
273 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
274 struct gfs2_alloc *al;
275 struct gfs2_rgrpd *rgd;
278 if (ip->i_di.di_blocks != 1) {
279 if (gfs2_consist_inode(ip))
280 gfs2_dinode_print(ip);
284 al = gfs2_alloc_get(ip);
286 error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
290 error = gfs2_rindex_hold(sdp, &al->al_ri_gh);
294 rgd = gfs2_blk2rgrpd(sdp, ip->i_num.no_addr);
296 gfs2_consist_inode(ip);
298 goto out_rindex_relse;
301 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0,
304 goto out_rindex_relse;
306 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA, 1);
310 gfs2_trans_add_gl(ip->i_gl);
312 gfs2_free_di(rgd, ip);
315 clear_bit(GLF_STICKY, &ip->i_gl->gl_flags);
318 gfs2_glock_dq_uninit(&al->al_rgd_gh);
320 gfs2_glock_dq_uninit(&al->al_ri_gh);
322 gfs2_quota_unhold(ip);
329 * gfs2_change_nlink - Change nlink count on inode
330 * @ip: The GFS2 inode
331 * @diff: The change in the nlink count required
336 int gfs2_change_nlink(struct gfs2_inode *ip, int diff)
338 struct gfs2_sbd *sdp = ip->i_inode.i_sb->s_fs_info;
339 struct buffer_head *dibh;
343 BUG_ON(diff != 1 && diff != -1);
344 nlink = ip->i_inode.i_nlink + diff;
346 /* If we are reducing the nlink count, but the new value ends up being
347 bigger than the old one, we must have underflowed. */
348 if (diff < 0 && nlink > ip->i_inode.i_nlink) {
349 if (gfs2_consist_inode(ip))
350 gfs2_dinode_print(ip);
354 error = gfs2_meta_inode_buffer(ip, &dibh);
359 inc_nlink(&ip->i_inode);
361 drop_nlink(&ip->i_inode);
363 ip->i_di.di_ctime = get_seconds();
365 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
366 gfs2_dinode_out(ip, dibh->b_data);
368 mark_inode_dirty(&ip->i_inode);
370 if (ip->i_inode.i_nlink == 0) {
371 struct gfs2_rgrpd *rgd;
372 struct gfs2_holder ri_gh, rg_gh;
374 error = gfs2_rindex_hold(sdp, &ri_gh);
378 rgd = gfs2_blk2rgrpd(sdp, ip->i_num.no_addr);
381 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &rg_gh);
385 gfs2_unlink_di(&ip->i_inode); /* mark inode unlinked */
386 gfs2_glock_dq_uninit(&rg_gh);
388 gfs2_glock_dq_uninit(&ri_gh);
394 struct inode *gfs2_lookup_simple(struct inode *dip, const char *name)
397 gfs2_str2qstr(&qstr, name);
398 return gfs2_lookupi(dip, &qstr, 1, NULL);
403 * gfs2_lookupi - Look up a filename in a directory and return its inode
404 * @d_gh: An initialized holder for the directory glock
405 * @name: The name of the inode to look for
406 * @is_root: If 1, ignore the caller's permissions
407 * @i_gh: An uninitialized holder for the new inode glock
409 * There will always be a vnode (Linux VFS inode) for the d_gh inode unless
415 struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
416 int is_root, struct nameidata *nd)
418 struct super_block *sb = dir->i_sb;
419 struct gfs2_inode *dip = GFS2_I(dir);
420 struct gfs2_holder d_gh;
421 struct gfs2_inum_host inum;
424 struct inode *inode = NULL;
426 if (!name->len || name->len > GFS2_FNAMESIZE)
427 return ERR_PTR(-ENAMETOOLONG);
429 if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) ||
430 (name->len == 2 && memcmp(name->name, "..", 2) == 0 &&
431 dir == sb->s_root->d_inode)) {
436 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
438 return ERR_PTR(error);
441 error = permission(dir, MAY_EXEC, NULL);
446 error = gfs2_dir_search(dir, name, &inum, &type);
450 inode = gfs2_inode_lookup(sb, &inum, type);
453 gfs2_glock_dq_uninit(&d_gh);
454 if (error == -ENOENT)
459 static int pick_formal_ino_1(struct gfs2_sbd *sdp, u64 *formal_ino)
461 struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode);
462 struct buffer_head *bh;
463 struct gfs2_inum_range_host ir;
466 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
469 mutex_lock(&sdp->sd_inum_mutex);
471 error = gfs2_meta_inode_buffer(ip, &bh);
473 mutex_unlock(&sdp->sd_inum_mutex);
478 gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode));
481 *formal_ino = ir.ir_start++;
483 gfs2_trans_add_bh(ip->i_gl, bh, 1);
484 gfs2_inum_range_out(&ir,
485 bh->b_data + sizeof(struct gfs2_dinode));
487 mutex_unlock(&sdp->sd_inum_mutex);
494 mutex_unlock(&sdp->sd_inum_mutex);
500 static int pick_formal_ino_2(struct gfs2_sbd *sdp, u64 *formal_ino)
502 struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode);
503 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_inum_inode);
504 struct gfs2_holder gh;
505 struct buffer_head *bh;
506 struct gfs2_inum_range_host ir;
509 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
513 error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0);
516 mutex_lock(&sdp->sd_inum_mutex);
518 error = gfs2_meta_inode_buffer(ip, &bh);
522 gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode));
525 struct buffer_head *m_bh;
529 error = gfs2_meta_inode_buffer(m_ip, &m_bh);
533 z = *(__be64 *)(m_bh->b_data + sizeof(struct gfs2_dinode));
534 x = y = be64_to_cpu(z);
536 ir.ir_length = GFS2_INUM_QUANTUM;
537 x += GFS2_INUM_QUANTUM;
539 gfs2_consist_inode(m_ip);
541 gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1);
542 *(__be64 *)(m_bh->b_data + sizeof(struct gfs2_dinode)) = z;
547 *formal_ino = ir.ir_start++;
550 gfs2_trans_add_bh(ip->i_gl, bh, 1);
551 gfs2_inum_range_out(&ir, bh->b_data + sizeof(struct gfs2_dinode));
556 mutex_unlock(&sdp->sd_inum_mutex);
559 gfs2_glock_dq_uninit(&gh);
563 static int pick_formal_ino(struct gfs2_sbd *sdp, u64 *inum)
567 error = pick_formal_ino_1(sdp, inum);
571 error = pick_formal_ino_2(sdp, inum);
577 * create_ok - OK to create a new on-disk inode here?
578 * @dip: Directory in which dinode is to be created
579 * @name: Name of new dinode
585 static int create_ok(struct gfs2_inode *dip, const struct qstr *name,
590 error = permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL);
594 /* Don't create entries in an unlinked directory */
595 if (!dip->i_inode.i_nlink)
598 error = gfs2_dir_search(&dip->i_inode, name, NULL, NULL);
609 if (dip->i_di.di_entries == (u32)-1)
611 if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1)
617 static void munge_mode_uid_gid(struct gfs2_inode *dip, unsigned int *mode,
618 unsigned int *uid, unsigned int *gid)
620 if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir &&
621 (dip->i_inode.i_mode & S_ISUID) && dip->i_inode.i_uid) {
624 else if (dip->i_inode.i_uid != current->fsuid)
626 *uid = dip->i_inode.i_uid;
628 *uid = current->fsuid;
630 if (dip->i_inode.i_mode & S_ISGID) {
633 *gid = dip->i_inode.i_gid;
635 *gid = current->fsgid;
638 static int alloc_dinode(struct gfs2_inode *dip, struct gfs2_inum_host *inum,
641 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
646 dip->i_alloc.al_requested = RES_DINODE;
647 error = gfs2_inplace_reserve(dip);
651 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS, 0);
655 inum->no_addr = gfs2_alloc_di(dip, generation);
660 gfs2_inplace_release(dip);
667 * init_dinode - Fill in a new dinode structure
668 * @dip: the directory this inode is being created in
669 * @gl: The glock covering the new inode
670 * @inum: the inode number
671 * @mode: the file permissions
677 static void init_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
678 const struct gfs2_inum_host *inum, unsigned int mode,
679 unsigned int uid, unsigned int gid,
680 const u64 *generation, dev_t dev)
682 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
683 struct gfs2_dinode *di;
684 struct buffer_head *dibh;
686 dibh = gfs2_meta_new(gl, inum->no_addr);
687 gfs2_trans_add_bh(gl, dibh, 1);
688 gfs2_metatype_set(dibh, GFS2_METATYPE_DI, GFS2_FORMAT_DI);
689 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
690 di = (struct gfs2_dinode *)dibh->b_data;
692 di->di_num.no_formal_ino = cpu_to_be64(inum->no_formal_ino);
693 di->di_num.no_addr = cpu_to_be64(inum->no_addr);
694 di->di_mode = cpu_to_be32(mode);
695 di->di_uid = cpu_to_be32(uid);
696 di->di_gid = cpu_to_be32(gid);
697 di->di_nlink = cpu_to_be32(0);
698 di->di_size = cpu_to_be64(0);
699 di->di_blocks = cpu_to_be64(1);
700 di->di_atime = di->di_mtime = di->di_ctime = cpu_to_be64(get_seconds());
701 di->di_major = cpu_to_be32(MAJOR(dev));
702 di->di_minor = cpu_to_be32(MINOR(dev));
703 di->di_goal_meta = di->di_goal_data = cpu_to_be64(inum->no_addr);
704 di->di_generation = cpu_to_be64(*generation);
705 di->di_flags = cpu_to_be32(0);
708 if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_JDATA) ||
709 gfs2_tune_get(sdp, gt_new_files_jdata))
710 di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA);
711 if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_DIRECTIO) ||
712 gfs2_tune_get(sdp, gt_new_files_directio))
713 di->di_flags |= cpu_to_be32(GFS2_DIF_DIRECTIO);
714 } else if (S_ISDIR(mode)) {
715 di->di_flags |= cpu_to_be32(dip->i_di.di_flags &
716 GFS2_DIF_INHERIT_DIRECTIO);
717 di->di_flags |= cpu_to_be32(dip->i_di.di_flags &
718 GFS2_DIF_INHERIT_JDATA);
722 di->di_payload_format = cpu_to_be32(0);
723 di->di_height = cpu_to_be32(0);
726 di->di_depth = cpu_to_be16(0);
727 di->di_entries = cpu_to_be32(0);
728 memset(&di->__pad4, 0, sizeof(di->__pad4));
729 di->di_eattr = cpu_to_be64(0);
730 memset(&di->di_reserved, 0, sizeof(di->di_reserved));
735 static int make_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
736 unsigned int mode, const struct gfs2_inum_host *inum,
737 const u64 *generation, dev_t dev)
739 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
740 unsigned int uid, gid;
743 munge_mode_uid_gid(dip, &mode, &uid, &gid);
746 error = gfs2_quota_lock(dip, uid, gid);
750 error = gfs2_quota_check(dip, uid, gid);
754 error = gfs2_trans_begin(sdp, RES_DINODE + RES_QUOTA, 0);
758 init_dinode(dip, gl, inum, mode, uid, gid, generation, dev);
759 gfs2_quota_change(dip, +1, uid, gid);
763 gfs2_quota_unlock(dip);
769 static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
770 struct gfs2_inode *ip)
772 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
773 struct gfs2_alloc *al;
775 struct buffer_head *dibh;
778 al = gfs2_alloc_get(dip);
780 error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
784 error = alloc_required = gfs2_diradd_alloc_required(&dip->i_inode, name);
785 if (alloc_required < 0)
787 if (alloc_required) {
788 error = gfs2_quota_check(dip, dip->i_inode.i_uid, dip->i_inode.i_gid);
790 goto fail_quota_locks;
792 al->al_requested = sdp->sd_max_dirres;
794 error = gfs2_inplace_reserve(dip);
796 goto fail_quota_locks;
798 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
799 al->al_rgd->rd_ri.ri_length +
801 RES_STATFS + RES_QUOTA, 0);
805 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
807 goto fail_quota_locks;
810 error = gfs2_dir_add(&dip->i_inode, name, &ip->i_num, IF2DT(ip->i_inode.i_mode));
814 error = gfs2_meta_inode_buffer(ip, &dibh);
817 ip->i_inode.i_nlink = 1;
818 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
819 gfs2_dinode_out(ip, dibh->b_data);
827 if (dip->i_alloc.al_rgd)
828 gfs2_inplace_release(dip);
831 gfs2_quota_unlock(dip);
838 static int gfs2_security_init(struct gfs2_inode *dip, struct gfs2_inode *ip)
844 struct gfs2_ea_request er;
846 err = security_inode_init_security(&ip->i_inode, &dip->i_inode,
847 &name, &value, &len);
850 if (err == -EOPNOTSUPP)
855 memset(&er, 0, sizeof(struct gfs2_ea_request));
857 er.er_type = GFS2_EATYPE_SECURITY;
860 er.er_name_len = strlen(name);
861 er.er_data_len = len;
863 err = gfs2_ea_set_i(ip, &er);
872 * gfs2_createi - Create a new inode
873 * @ghs: An array of two holders
874 * @name: The name of the new file
875 * @mode: the permissions on the new inode
877 * @ghs[0] is an initialized holder for the directory
878 * @ghs[1] is the holder for the inode lock
880 * If the return value is not NULL, the glocks on both the directory and the new
881 * file are held. A transaction has been started and an inplace reservation
887 struct inode *gfs2_createi(struct gfs2_holder *ghs, const struct qstr *name,
888 unsigned int mode, dev_t dev)
891 struct gfs2_inode *dip = ghs->gh_gl->gl_object;
892 struct inode *dir = &dip->i_inode;
893 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
894 struct gfs2_inum_host inum;
898 if (!name->len || name->len > GFS2_FNAMESIZE)
899 return ERR_PTR(-ENAMETOOLONG);
901 gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs);
902 error = gfs2_glock_nq(ghs);
906 error = create_ok(dip, name, mode);
910 error = pick_formal_ino(sdp, &inum.no_formal_ino);
914 error = alloc_dinode(dip, &inum, &generation);
918 if (inum.no_addr < dip->i_num.no_addr) {
921 error = gfs2_glock_nq_num(sdp, inum.no_addr,
922 &gfs2_inode_glops, LM_ST_EXCLUSIVE,
925 return ERR_PTR(error);
928 gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs);
929 error = gfs2_glock_nq(ghs);
931 gfs2_glock_dq_uninit(ghs + 1);
932 return ERR_PTR(error);
935 error = create_ok(dip, name, mode);
939 error = gfs2_glock_nq_num(sdp, inum.no_addr,
940 &gfs2_inode_glops, LM_ST_EXCLUSIVE,
946 error = make_dinode(dip, ghs[1].gh_gl, mode, &inum, &generation, dev);
950 inode = gfs2_inode_lookup(dir->i_sb, &inum, IF2DT(mode));
954 error = gfs2_inode_refresh(GFS2_I(inode));
958 error = gfs2_acl_create(dip, GFS2_I(inode));
962 error = gfs2_security_init(dip, GFS2_I(inode));
966 error = link_dinode(dip, name, GFS2_I(inode));
971 return ERR_PTR(-ENOMEM);
977 gfs2_glock_dq_uninit(ghs + 1);
981 return ERR_PTR(error);
985 * gfs2_rmdiri - Remove a directory
986 * @dip: The parent directory of the directory to be removed
987 * @name: The name of the directory to be removed
988 * @ip: The GFS2 inode of the directory to be removed
990 * Assumes Glocks on dip and ip are held
995 int gfs2_rmdiri(struct gfs2_inode *dip, const struct qstr *name,
996 struct gfs2_inode *ip)
1001 if (ip->i_di.di_entries != 2) {
1002 if (gfs2_consist_inode(ip))
1003 gfs2_dinode_print(ip);
1007 error = gfs2_dir_del(dip, name);
1011 error = gfs2_change_nlink(dip, -1);
1015 gfs2_str2qstr(&dotname, ".");
1016 error = gfs2_dir_del(ip, &dotname);
1020 gfs2_str2qstr(&dotname, "..");
1021 error = gfs2_dir_del(ip, &dotname);
1025 /* It looks odd, but it really should be done twice */
1026 error = gfs2_change_nlink(ip, -1);
1030 error = gfs2_change_nlink(ip, -1);
1038 * gfs2_unlink_ok - check to see that a inode is still in a directory
1039 * @dip: the directory
1040 * @name: the name of the file
1043 * Assumes that the lock on (at least) @dip is held.
1045 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
1048 int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
1049 struct gfs2_inode *ip)
1051 struct gfs2_inum_host inum;
1055 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
1058 if ((dip->i_inode.i_mode & S_ISVTX) &&
1059 dip->i_inode.i_uid != current->fsuid &&
1060 ip->i_inode.i_uid != current->fsuid && !capable(CAP_FOWNER))
1063 if (IS_APPEND(&dip->i_inode))
1066 error = permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL);
1070 error = gfs2_dir_search(&dip->i_inode, name, &inum, &type);
1074 if (!gfs2_inum_equal(&inum, &ip->i_num))
1077 if (IF2DT(ip->i_inode.i_mode) != type) {
1078 gfs2_consist_inode(dip);
1086 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1090 * Follow @to back to the root and make sure we don't encounter @this
1091 * Assumes we already hold the rename lock.
1096 int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1098 struct inode *dir = &to->i_inode;
1099 struct super_block *sb = dir->i_sb;
1104 gfs2_str2qstr(&dotdot, "..");
1109 if (dir == &this->i_inode) {
1113 if (dir == sb->s_root->d_inode) {
1118 tmp = gfs2_lookupi(dir, &dotdot, 1, NULL);
1120 error = PTR_ERR(tmp);
1134 * gfs2_readlinki - return the contents of a symlink
1135 * @ip: the symlink's inode
1136 * @buf: a pointer to the buffer to be filled
1137 * @len: a pointer to the length of @buf
1139 * If @buf is too small, a piece of memory is kmalloc()ed and needs
1140 * to be freed by the caller.
1145 int gfs2_readlinki(struct gfs2_inode *ip, char **buf, unsigned int *len)
1147 struct gfs2_holder i_gh;
1148 struct buffer_head *dibh;
1152 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &i_gh);
1153 error = gfs2_glock_nq_atime(&i_gh);
1155 gfs2_holder_uninit(&i_gh);
1159 if (!ip->i_di.di_size) {
1160 gfs2_consist_inode(ip);
1165 error = gfs2_meta_inode_buffer(ip, &dibh);
1169 x = ip->i_di.di_size + 1;
1171 *buf = kmalloc(x, GFP_KERNEL);
1178 memcpy(*buf, dibh->b_data + sizeof(struct gfs2_dinode), x);
1184 gfs2_glock_dq_uninit(&i_gh);
1189 * gfs2_glock_nq_atime - Acquire a hold on an inode's glock, and
1190 * conditionally update the inode's atime
1191 * @gh: the holder to acquire
1193 * Tests atime (access time) for gfs2_read, gfs2_readdir and gfs2_mmap
1194 * Update if the difference between the current time and the inode's current
1195 * atime is greater than an interval specified at mount.
1200 int gfs2_glock_nq_atime(struct gfs2_holder *gh)
1202 struct gfs2_glock *gl = gh->gh_gl;
1203 struct gfs2_sbd *sdp = gl->gl_sbd;
1204 struct gfs2_inode *ip = gl->gl_object;
1205 s64 curtime, quantum = gfs2_tune_get(sdp, gt_atime_quantum);
1210 if (gfs2_assert_warn(sdp, gh->gh_flags & GL_ATIME) ||
1211 gfs2_assert_warn(sdp, !(gh->gh_flags & GL_ASYNC)) ||
1212 gfs2_assert_warn(sdp, gl->gl_ops == &gfs2_inode_glops))
1215 state = gh->gh_state;
1216 flags = gh->gh_flags;
1218 error = gfs2_glock_nq(gh);
1222 if (test_bit(SDF_NOATIME, &sdp->sd_flags) ||
1223 (sdp->sd_vfs->s_flags & MS_RDONLY))
1226 curtime = get_seconds();
1227 if (curtime - ip->i_di.di_atime >= quantum) {
1229 gfs2_holder_reinit(LM_ST_EXCLUSIVE, gh->gh_flags & ~LM_FLAG_ANY,
1231 error = gfs2_glock_nq(gh);
1235 /* Verify that atime hasn't been updated while we were
1236 trying to get exclusive lock. */
1238 curtime = get_seconds();
1239 if (curtime - ip->i_di.di_atime >= quantum) {
1240 struct buffer_head *dibh;
1241 struct gfs2_dinode *di;
1243 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
1244 if (error == -EROFS)
1249 error = gfs2_meta_inode_buffer(ip, &dibh);
1251 goto fail_end_trans;
1253 ip->i_di.di_atime = curtime;
1255 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1256 di = (struct gfs2_dinode *)dibh->b_data;
1257 di->di_atime = cpu_to_be64(ip->i_di.di_atime);
1260 gfs2_trans_end(sdp);
1263 /* If someone else has asked for the glock,
1264 unlock and let them have it. Then reacquire
1265 in the original state. */
1266 if (gfs2_glock_is_blocking(gl)) {
1268 gfs2_holder_reinit(state, flags, gh);
1269 return gfs2_glock_nq(gh);
1276 gfs2_trans_end(sdp);
1283 * glock_compare_atime - Compare two struct gfs2_glock structures for sort
1284 * @arg_a: the first structure
1285 * @arg_b: the second structure
1287 * Returns: 1 if A > B
1292 static int glock_compare_atime(const void *arg_a, const void *arg_b)
1294 const struct gfs2_holder *gh_a = *(const struct gfs2_holder **)arg_a;
1295 const struct gfs2_holder *gh_b = *(const struct gfs2_holder **)arg_b;
1296 const struct lm_lockname *a = &gh_a->gh_gl->gl_name;
1297 const struct lm_lockname *b = &gh_b->gh_gl->gl_name;
1299 if (a->ln_number > b->ln_number)
1301 if (a->ln_number < b->ln_number)
1303 if (gh_a->gh_state == LM_ST_SHARED && gh_b->gh_state == LM_ST_EXCLUSIVE)
1305 if (gh_a->gh_state == LM_ST_SHARED && (gh_b->gh_flags & GL_ATIME))
1312 * gfs2_glock_nq_m_atime - acquire multiple glocks where one may need an
1314 * @num_gh: the number of structures
1315 * @ghs: an array of struct gfs2_holder structures
1317 * Returns: 0 on success (all glocks acquired),
1318 * errno on failure (no glocks acquired)
1321 int gfs2_glock_nq_m_atime(unsigned int num_gh, struct gfs2_holder *ghs)
1323 struct gfs2_holder **p;
1331 ghs->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC);
1332 if (ghs->gh_flags & GL_ATIME)
1333 error = gfs2_glock_nq_atime(ghs);
1335 error = gfs2_glock_nq(ghs);
1339 p = kcalloc(num_gh, sizeof(struct gfs2_holder *), GFP_KERNEL);
1343 for (x = 0; x < num_gh; x++)
1346 sort(p, num_gh, sizeof(struct gfs2_holder *), glock_compare_atime,NULL);
1348 for (x = 0; x < num_gh; x++) {
1349 p[x]->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC);
1351 if (p[x]->gh_flags & GL_ATIME)
1352 error = gfs2_glock_nq_atime(p[x]);
1354 error = gfs2_glock_nq(p[x]);
1358 gfs2_glock_dq(p[x]);
1369 __gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr)
1371 struct buffer_head *dibh;
1374 error = gfs2_meta_inode_buffer(ip, &dibh);
1376 error = inode_setattr(&ip->i_inode, attr);
1377 gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error);
1378 gfs2_inode_attr_out(ip);
1380 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1381 gfs2_dinode_out(ip, dibh->b_data);
1388 * gfs2_setattr_simple -
1392 * Called with a reference on the vnode.
1397 int gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr)
1401 if (current->journal_info)
1402 return __gfs2_setattr_simple(ip, attr);
1404 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE, 0);
1408 error = __gfs2_setattr_simple(ip, attr);
1409 gfs2_trans_end(GFS2_SB(&ip->i_inode));