2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
5 * This copyrighted material is made available to anyone wishing to use,
6 * modify, copy, or redistribute it subject to the terms and conditions
7 * of the GNU General Public License version 2.
10 #include <linux/sched.h>
11 #include <linux/slab.h>
12 #include <linux/spinlock.h>
13 #include <linux/completion.h>
14 #include <linux/buffer_head.h>
15 #include <linux/posix_acl.h>
16 #include <linux/sort.h>
17 #include <linux/gfs2_ondisk.h>
18 #include <linux/crc32.h>
19 #include <linux/lm_interface.h>
20 #include <linux/security.h>
33 #include "ops_address.h"
35 #include "ops_inode.h"
42 * gfs2_inode_attr_in - Copy attributes from the dinode into the VFS inode
43 * @ip: The GFS2 inode (with embedded disk inode data)
44 * @inode: The Linux VFS inode
48 void gfs2_inode_attr_in(struct gfs2_inode *ip)
50 struct inode *inode = &ip->i_inode;
51 struct gfs2_dinode_host *di = &ip->i_di;
53 inode->i_ino = ip->i_num.no_addr;
54 i_size_write(inode, di->di_size);
55 inode->i_blocks = di->di_blocks <<
56 (GFS2_SB(inode)->sd_sb.sb_bsize_shift - GFS2_BASIC_BLOCK_SHIFT);
58 if (di->di_flags & GFS2_DIF_IMMUTABLE)
59 inode->i_flags |= S_IMMUTABLE;
61 inode->i_flags &= ~S_IMMUTABLE;
63 if (di->di_flags & GFS2_DIF_APPENDONLY)
64 inode->i_flags |= S_APPEND;
66 inode->i_flags &= ~S_APPEND;
69 static int iget_test(struct inode *inode, void *opaque)
71 struct gfs2_inode *ip = GFS2_I(inode);
72 struct gfs2_inum_host *inum = opaque;
74 if (ip && ip->i_num.no_addr == inum->no_addr)
80 static int iget_set(struct inode *inode, void *opaque)
82 struct gfs2_inode *ip = GFS2_I(inode);
83 struct gfs2_inum_host *inum = opaque;
89 struct inode *gfs2_ilookup(struct super_block *sb, struct gfs2_inum_host *inum)
91 return ilookup5(sb, (unsigned long)inum->no_formal_ino,
95 static struct inode *gfs2_iget(struct super_block *sb, struct gfs2_inum_host *inum)
97 return iget5_locked(sb, (unsigned long)inum->no_formal_ino,
98 iget_test, iget_set, inum);
102 * gfs2_inode_lookup - Lookup an inode
103 * @sb: The super block
104 * @inum: The inode number
105 * @type: The type of the inode
107 * Returns: A VFS inode, or an error
110 struct inode *gfs2_inode_lookup(struct super_block *sb, struct gfs2_inum_host *inum, unsigned int type)
112 struct inode *inode = gfs2_iget(sb, inum);
113 struct gfs2_inode *ip = GFS2_I(inode);
114 struct gfs2_glock *io_gl;
118 return ERR_PTR(-ENOBUFS);
120 if (inode->i_state & I_NEW) {
121 struct gfs2_sbd *sdp = GFS2_SB(inode);
122 umode_t mode = DT2IF(type);
123 inode->i_private = ip;
124 inode->i_mode = mode;
127 inode->i_op = &gfs2_file_iops;
128 inode->i_fop = &gfs2_file_fops;
129 inode->i_mapping->a_ops = &gfs2_file_aops;
130 } else if (S_ISDIR(mode)) {
131 inode->i_op = &gfs2_dir_iops;
132 inode->i_fop = &gfs2_dir_fops;
133 } else if (S_ISLNK(mode)) {
134 inode->i_op = &gfs2_symlink_iops;
136 inode->i_op = &gfs2_dev_iops;
139 error = gfs2_glock_get(sdp, inum->no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
142 ip->i_gl->gl_object = ip;
144 error = gfs2_glock_get(sdp, inum->no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
148 set_bit(GIF_INVALID, &ip->i_flags);
149 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
153 gfs2_glock_put(io_gl);
154 unlock_new_inode(inode);
159 gfs2_glock_put(io_gl);
161 ip->i_gl->gl_object = NULL;
162 gfs2_glock_put(ip->i_gl);
165 return ERR_PTR(error);
168 static int gfs2_dinode_in(struct gfs2_inode *ip, const void *buf)
170 struct gfs2_dinode_host *di = &ip->i_di;
171 const struct gfs2_dinode *str = buf;
173 if (ip->i_num.no_addr != be64_to_cpu(str->di_num.no_addr)) {
174 if (gfs2_consist_inode(ip))
175 gfs2_dinode_print(ip);
178 if (ip->i_num.no_formal_ino != be64_to_cpu(str->di_num.no_formal_ino))
181 ip->i_inode.i_mode = be32_to_cpu(str->di_mode);
182 ip->i_inode.i_rdev = 0;
183 switch (ip->i_inode.i_mode & S_IFMT) {
186 ip->i_inode.i_rdev = MKDEV(be32_to_cpu(str->di_major),
187 be32_to_cpu(str->di_minor));
191 ip->i_inode.i_uid = be32_to_cpu(str->di_uid);
192 ip->i_inode.i_gid = be32_to_cpu(str->di_gid);
194 * We will need to review setting the nlink count here in the
195 * light of the forthcoming ro bind mount work. This is a reminder
198 ip->i_inode.i_nlink = be32_to_cpu(str->di_nlink);
199 di->di_size = be64_to_cpu(str->di_size);
200 di->di_blocks = be64_to_cpu(str->di_blocks);
201 ip->i_inode.i_atime.tv_sec = be64_to_cpu(str->di_atime);
202 ip->i_inode.i_atime.tv_nsec = 0;
203 ip->i_inode.i_mtime.tv_sec = be64_to_cpu(str->di_mtime);
204 ip->i_inode.i_mtime.tv_nsec = 0;
205 ip->i_inode.i_ctime.tv_sec = be64_to_cpu(str->di_ctime);
206 ip->i_inode.i_ctime.tv_nsec = 0;
208 di->di_goal_meta = be64_to_cpu(str->di_goal_meta);
209 di->di_goal_data = be64_to_cpu(str->di_goal_data);
210 di->di_generation = be64_to_cpu(str->di_generation);
212 di->di_flags = be32_to_cpu(str->di_flags);
213 di->di_height = be16_to_cpu(str->di_height);
215 di->di_depth = be16_to_cpu(str->di_depth);
216 di->di_entries = be32_to_cpu(str->di_entries);
218 di->di_eattr = be64_to_cpu(str->di_eattr);
223 * gfs2_inode_refresh - Refresh the incore copy of the dinode
224 * @ip: The GFS2 inode
229 int gfs2_inode_refresh(struct gfs2_inode *ip)
231 struct buffer_head *dibh;
234 error = gfs2_meta_inode_buffer(ip, &dibh);
238 if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), dibh, GFS2_METATYPE_DI)) {
243 error = gfs2_dinode_in(ip, dibh->b_data);
245 clear_bit(GIF_INVALID, &ip->i_flags);
250 int gfs2_dinode_dealloc(struct gfs2_inode *ip)
252 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
253 struct gfs2_alloc *al;
254 struct gfs2_rgrpd *rgd;
257 if (ip->i_di.di_blocks != 1) {
258 if (gfs2_consist_inode(ip))
259 gfs2_dinode_print(ip);
263 al = gfs2_alloc_get(ip);
265 error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
269 error = gfs2_rindex_hold(sdp, &al->al_ri_gh);
273 rgd = gfs2_blk2rgrpd(sdp, ip->i_num.no_addr);
275 gfs2_consist_inode(ip);
277 goto out_rindex_relse;
280 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0,
283 goto out_rindex_relse;
285 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA, 1);
289 gfs2_trans_add_gl(ip->i_gl);
291 gfs2_free_di(rgd, ip);
294 clear_bit(GLF_STICKY, &ip->i_gl->gl_flags);
297 gfs2_glock_dq_uninit(&al->al_rgd_gh);
299 gfs2_glock_dq_uninit(&al->al_ri_gh);
301 gfs2_quota_unhold(ip);
308 * gfs2_change_nlink - Change nlink count on inode
309 * @ip: The GFS2 inode
310 * @diff: The change in the nlink count required
315 int gfs2_change_nlink(struct gfs2_inode *ip, int diff)
317 struct gfs2_sbd *sdp = ip->i_inode.i_sb->s_fs_info;
318 struct buffer_head *dibh;
322 BUG_ON(diff != 1 && diff != -1);
323 nlink = ip->i_inode.i_nlink + diff;
325 /* If we are reducing the nlink count, but the new value ends up being
326 bigger than the old one, we must have underflowed. */
327 if (diff < 0 && nlink > ip->i_inode.i_nlink) {
328 if (gfs2_consist_inode(ip))
329 gfs2_dinode_print(ip);
333 error = gfs2_meta_inode_buffer(ip, &dibh);
338 inc_nlink(&ip->i_inode);
340 drop_nlink(&ip->i_inode);
342 ip->i_inode.i_ctime.tv_sec = get_seconds();
344 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
345 gfs2_dinode_out(ip, dibh->b_data);
347 mark_inode_dirty(&ip->i_inode);
349 if (ip->i_inode.i_nlink == 0) {
350 struct gfs2_rgrpd *rgd;
351 struct gfs2_holder ri_gh, rg_gh;
353 error = gfs2_rindex_hold(sdp, &ri_gh);
357 rgd = gfs2_blk2rgrpd(sdp, ip->i_num.no_addr);
360 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &rg_gh);
364 gfs2_unlink_di(&ip->i_inode); /* mark inode unlinked */
365 gfs2_glock_dq_uninit(&rg_gh);
367 gfs2_glock_dq_uninit(&ri_gh);
373 struct inode *gfs2_lookup_simple(struct inode *dip, const char *name)
376 gfs2_str2qstr(&qstr, name);
377 return gfs2_lookupi(dip, &qstr, 1, NULL);
382 * gfs2_lookupi - Look up a filename in a directory and return its inode
383 * @d_gh: An initialized holder for the directory glock
384 * @name: The name of the inode to look for
385 * @is_root: If 1, ignore the caller's permissions
386 * @i_gh: An uninitialized holder for the new inode glock
388 * There will always be a vnode (Linux VFS inode) for the d_gh inode unless
394 struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
395 int is_root, struct nameidata *nd)
397 struct super_block *sb = dir->i_sb;
398 struct gfs2_inode *dip = GFS2_I(dir);
399 struct gfs2_holder d_gh;
400 struct gfs2_inum_host inum;
403 struct inode *inode = NULL;
405 if (!name->len || name->len > GFS2_FNAMESIZE)
406 return ERR_PTR(-ENAMETOOLONG);
408 if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) ||
409 (name->len == 2 && memcmp(name->name, "..", 2) == 0 &&
410 dir == sb->s_root->d_inode)) {
415 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
417 return ERR_PTR(error);
420 error = permission(dir, MAY_EXEC, NULL);
425 error = gfs2_dir_search(dir, name, &inum, &type);
429 inode = gfs2_inode_lookup(sb, &inum, type);
432 gfs2_glock_dq_uninit(&d_gh);
433 if (error == -ENOENT)
438 static int pick_formal_ino_1(struct gfs2_sbd *sdp, u64 *formal_ino)
440 struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode);
441 struct buffer_head *bh;
442 struct gfs2_inum_range_host ir;
445 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
448 mutex_lock(&sdp->sd_inum_mutex);
450 error = gfs2_meta_inode_buffer(ip, &bh);
452 mutex_unlock(&sdp->sd_inum_mutex);
457 gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode));
460 *formal_ino = ir.ir_start++;
462 gfs2_trans_add_bh(ip->i_gl, bh, 1);
463 gfs2_inum_range_out(&ir,
464 bh->b_data + sizeof(struct gfs2_dinode));
466 mutex_unlock(&sdp->sd_inum_mutex);
473 mutex_unlock(&sdp->sd_inum_mutex);
479 static int pick_formal_ino_2(struct gfs2_sbd *sdp, u64 *formal_ino)
481 struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode);
482 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_inum_inode);
483 struct gfs2_holder gh;
484 struct buffer_head *bh;
485 struct gfs2_inum_range_host ir;
488 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
492 error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0);
495 mutex_lock(&sdp->sd_inum_mutex);
497 error = gfs2_meta_inode_buffer(ip, &bh);
501 gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode));
504 struct buffer_head *m_bh;
508 error = gfs2_meta_inode_buffer(m_ip, &m_bh);
512 z = *(__be64 *)(m_bh->b_data + sizeof(struct gfs2_dinode));
513 x = y = be64_to_cpu(z);
515 ir.ir_length = GFS2_INUM_QUANTUM;
516 x += GFS2_INUM_QUANTUM;
518 gfs2_consist_inode(m_ip);
520 gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1);
521 *(__be64 *)(m_bh->b_data + sizeof(struct gfs2_dinode)) = z;
526 *formal_ino = ir.ir_start++;
529 gfs2_trans_add_bh(ip->i_gl, bh, 1);
530 gfs2_inum_range_out(&ir, bh->b_data + sizeof(struct gfs2_dinode));
535 mutex_unlock(&sdp->sd_inum_mutex);
538 gfs2_glock_dq_uninit(&gh);
542 static int pick_formal_ino(struct gfs2_sbd *sdp, u64 *inum)
546 error = pick_formal_ino_1(sdp, inum);
550 error = pick_formal_ino_2(sdp, inum);
556 * create_ok - OK to create a new on-disk inode here?
557 * @dip: Directory in which dinode is to be created
558 * @name: Name of new dinode
564 static int create_ok(struct gfs2_inode *dip, const struct qstr *name,
569 error = permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL);
573 /* Don't create entries in an unlinked directory */
574 if (!dip->i_inode.i_nlink)
577 error = gfs2_dir_search(&dip->i_inode, name, NULL, NULL);
588 if (dip->i_di.di_entries == (u32)-1)
590 if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1)
596 static void munge_mode_uid_gid(struct gfs2_inode *dip, unsigned int *mode,
597 unsigned int *uid, unsigned int *gid)
599 if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir &&
600 (dip->i_inode.i_mode & S_ISUID) && dip->i_inode.i_uid) {
603 else if (dip->i_inode.i_uid != current->fsuid)
605 *uid = dip->i_inode.i_uid;
607 *uid = current->fsuid;
609 if (dip->i_inode.i_mode & S_ISGID) {
612 *gid = dip->i_inode.i_gid;
614 *gid = current->fsgid;
617 static int alloc_dinode(struct gfs2_inode *dip, struct gfs2_inum_host *inum,
620 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
625 dip->i_alloc.al_requested = RES_DINODE;
626 error = gfs2_inplace_reserve(dip);
630 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS, 0);
634 inum->no_addr = gfs2_alloc_di(dip, generation);
639 gfs2_inplace_release(dip);
646 * init_dinode - Fill in a new dinode structure
647 * @dip: the directory this inode is being created in
648 * @gl: The glock covering the new inode
649 * @inum: the inode number
650 * @mode: the file permissions
656 static void init_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
657 const struct gfs2_inum_host *inum, unsigned int mode,
658 unsigned int uid, unsigned int gid,
659 const u64 *generation, dev_t dev)
661 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
662 struct gfs2_dinode *di;
663 struct buffer_head *dibh;
665 dibh = gfs2_meta_new(gl, inum->no_addr);
666 gfs2_trans_add_bh(gl, dibh, 1);
667 gfs2_metatype_set(dibh, GFS2_METATYPE_DI, GFS2_FORMAT_DI);
668 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
669 di = (struct gfs2_dinode *)dibh->b_data;
671 di->di_num.no_formal_ino = cpu_to_be64(inum->no_formal_ino);
672 di->di_num.no_addr = cpu_to_be64(inum->no_addr);
673 di->di_mode = cpu_to_be32(mode);
674 di->di_uid = cpu_to_be32(uid);
675 di->di_gid = cpu_to_be32(gid);
676 di->di_nlink = cpu_to_be32(0);
677 di->di_size = cpu_to_be64(0);
678 di->di_blocks = cpu_to_be64(1);
679 di->di_atime = di->di_mtime = di->di_ctime = cpu_to_be64(get_seconds());
680 di->di_major = cpu_to_be32(MAJOR(dev));
681 di->di_minor = cpu_to_be32(MINOR(dev));
682 di->di_goal_meta = di->di_goal_data = cpu_to_be64(inum->no_addr);
683 di->di_generation = cpu_to_be64(*generation);
684 di->di_flags = cpu_to_be32(0);
687 if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_JDATA) ||
688 gfs2_tune_get(sdp, gt_new_files_jdata))
689 di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA);
690 if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_DIRECTIO) ||
691 gfs2_tune_get(sdp, gt_new_files_directio))
692 di->di_flags |= cpu_to_be32(GFS2_DIF_DIRECTIO);
693 } else if (S_ISDIR(mode)) {
694 di->di_flags |= cpu_to_be32(dip->i_di.di_flags &
695 GFS2_DIF_INHERIT_DIRECTIO);
696 di->di_flags |= cpu_to_be32(dip->i_di.di_flags &
697 GFS2_DIF_INHERIT_JDATA);
701 di->di_payload_format = cpu_to_be32(S_ISDIR(mode) ? GFS2_FORMAT_DE : 0);
702 di->di_height = cpu_to_be32(0);
705 di->di_depth = cpu_to_be16(0);
706 di->di_entries = cpu_to_be32(0);
707 memset(&di->__pad4, 0, sizeof(di->__pad4));
708 di->di_eattr = cpu_to_be64(0);
709 memset(&di->di_reserved, 0, sizeof(di->di_reserved));
714 static int make_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
715 unsigned int mode, const struct gfs2_inum_host *inum,
716 const u64 *generation, dev_t dev)
718 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
719 unsigned int uid, gid;
722 munge_mode_uid_gid(dip, &mode, &uid, &gid);
725 error = gfs2_quota_lock(dip, uid, gid);
729 error = gfs2_quota_check(dip, uid, gid);
733 error = gfs2_trans_begin(sdp, RES_DINODE + RES_QUOTA, 0);
737 init_dinode(dip, gl, inum, mode, uid, gid, generation, dev);
738 gfs2_quota_change(dip, +1, uid, gid);
742 gfs2_quota_unlock(dip);
748 static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
749 struct gfs2_inode *ip)
751 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
752 struct gfs2_alloc *al;
754 struct buffer_head *dibh;
757 al = gfs2_alloc_get(dip);
759 error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
763 error = alloc_required = gfs2_diradd_alloc_required(&dip->i_inode, name);
764 if (alloc_required < 0)
766 if (alloc_required) {
767 error = gfs2_quota_check(dip, dip->i_inode.i_uid, dip->i_inode.i_gid);
769 goto fail_quota_locks;
771 al->al_requested = sdp->sd_max_dirres;
773 error = gfs2_inplace_reserve(dip);
775 goto fail_quota_locks;
777 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
778 al->al_rgd->rd_ri.ri_length +
780 RES_STATFS + RES_QUOTA, 0);
784 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
786 goto fail_quota_locks;
789 error = gfs2_dir_add(&dip->i_inode, name, &ip->i_num, IF2DT(ip->i_inode.i_mode));
793 error = gfs2_meta_inode_buffer(ip, &dibh);
796 ip->i_inode.i_nlink = 1;
797 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
798 gfs2_dinode_out(ip, dibh->b_data);
806 if (dip->i_alloc.al_rgd)
807 gfs2_inplace_release(dip);
810 gfs2_quota_unlock(dip);
817 static int gfs2_security_init(struct gfs2_inode *dip, struct gfs2_inode *ip)
823 struct gfs2_ea_request er;
825 err = security_inode_init_security(&ip->i_inode, &dip->i_inode,
826 &name, &value, &len);
829 if (err == -EOPNOTSUPP)
834 memset(&er, 0, sizeof(struct gfs2_ea_request));
836 er.er_type = GFS2_EATYPE_SECURITY;
839 er.er_name_len = strlen(name);
840 er.er_data_len = len;
842 err = gfs2_ea_set_i(ip, &er);
851 * gfs2_createi - Create a new inode
852 * @ghs: An array of two holders
853 * @name: The name of the new file
854 * @mode: the permissions on the new inode
856 * @ghs[0] is an initialized holder for the directory
857 * @ghs[1] is the holder for the inode lock
859 * If the return value is not NULL, the glocks on both the directory and the new
860 * file are held. A transaction has been started and an inplace reservation
866 struct inode *gfs2_createi(struct gfs2_holder *ghs, const struct qstr *name,
867 unsigned int mode, dev_t dev)
870 struct gfs2_inode *dip = ghs->gh_gl->gl_object;
871 struct inode *dir = &dip->i_inode;
872 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
873 struct gfs2_inum_host inum;
877 if (!name->len || name->len > GFS2_FNAMESIZE)
878 return ERR_PTR(-ENAMETOOLONG);
880 gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs);
881 error = gfs2_glock_nq(ghs);
885 error = create_ok(dip, name, mode);
889 error = pick_formal_ino(sdp, &inum.no_formal_ino);
893 error = alloc_dinode(dip, &inum, &generation);
897 if (inum.no_addr < dip->i_num.no_addr) {
900 error = gfs2_glock_nq_num(sdp, inum.no_addr,
901 &gfs2_inode_glops, LM_ST_EXCLUSIVE,
904 return ERR_PTR(error);
907 gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs);
908 error = gfs2_glock_nq(ghs);
910 gfs2_glock_dq_uninit(ghs + 1);
911 return ERR_PTR(error);
914 error = create_ok(dip, name, mode);
918 error = gfs2_glock_nq_num(sdp, inum.no_addr,
919 &gfs2_inode_glops, LM_ST_EXCLUSIVE,
925 error = make_dinode(dip, ghs[1].gh_gl, mode, &inum, &generation, dev);
929 inode = gfs2_inode_lookup(dir->i_sb, &inum, IF2DT(mode));
933 error = gfs2_inode_refresh(GFS2_I(inode));
937 error = gfs2_acl_create(dip, GFS2_I(inode));
941 error = gfs2_security_init(dip, GFS2_I(inode));
945 error = link_dinode(dip, name, GFS2_I(inode));
950 return ERR_PTR(-ENOMEM);
956 gfs2_glock_dq_uninit(ghs + 1);
960 return ERR_PTR(error);
964 * gfs2_rmdiri - Remove a directory
965 * @dip: The parent directory of the directory to be removed
966 * @name: The name of the directory to be removed
967 * @ip: The GFS2 inode of the directory to be removed
969 * Assumes Glocks on dip and ip are held
974 int gfs2_rmdiri(struct gfs2_inode *dip, const struct qstr *name,
975 struct gfs2_inode *ip)
980 if (ip->i_di.di_entries != 2) {
981 if (gfs2_consist_inode(ip))
982 gfs2_dinode_print(ip);
986 error = gfs2_dir_del(dip, name);
990 error = gfs2_change_nlink(dip, -1);
994 gfs2_str2qstr(&dotname, ".");
995 error = gfs2_dir_del(ip, &dotname);
999 gfs2_str2qstr(&dotname, "..");
1000 error = gfs2_dir_del(ip, &dotname);
1004 /* It looks odd, but it really should be done twice */
1005 error = gfs2_change_nlink(ip, -1);
1009 error = gfs2_change_nlink(ip, -1);
1017 * gfs2_unlink_ok - check to see that a inode is still in a directory
1018 * @dip: the directory
1019 * @name: the name of the file
1022 * Assumes that the lock on (at least) @dip is held.
1024 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
1027 int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
1028 struct gfs2_inode *ip)
1030 struct gfs2_inum_host inum;
1034 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
1037 if ((dip->i_inode.i_mode & S_ISVTX) &&
1038 dip->i_inode.i_uid != current->fsuid &&
1039 ip->i_inode.i_uid != current->fsuid && !capable(CAP_FOWNER))
1042 if (IS_APPEND(&dip->i_inode))
1045 error = permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL);
1049 error = gfs2_dir_search(&dip->i_inode, name, &inum, &type);
1053 if (!gfs2_inum_equal(&inum, &ip->i_num))
1056 if (IF2DT(ip->i_inode.i_mode) != type) {
1057 gfs2_consist_inode(dip);
1065 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1069 * Follow @to back to the root and make sure we don't encounter @this
1070 * Assumes we already hold the rename lock.
1075 int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1077 struct inode *dir = &to->i_inode;
1078 struct super_block *sb = dir->i_sb;
1083 gfs2_str2qstr(&dotdot, "..");
1088 if (dir == &this->i_inode) {
1092 if (dir == sb->s_root->d_inode) {
1097 tmp = gfs2_lookupi(dir, &dotdot, 1, NULL);
1099 error = PTR_ERR(tmp);
1113 * gfs2_readlinki - return the contents of a symlink
1114 * @ip: the symlink's inode
1115 * @buf: a pointer to the buffer to be filled
1116 * @len: a pointer to the length of @buf
1118 * If @buf is too small, a piece of memory is kmalloc()ed and needs
1119 * to be freed by the caller.
1124 int gfs2_readlinki(struct gfs2_inode *ip, char **buf, unsigned int *len)
1126 struct gfs2_holder i_gh;
1127 struct buffer_head *dibh;
1131 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &i_gh);
1132 error = gfs2_glock_nq_atime(&i_gh);
1134 gfs2_holder_uninit(&i_gh);
1138 if (!ip->i_di.di_size) {
1139 gfs2_consist_inode(ip);
1144 error = gfs2_meta_inode_buffer(ip, &dibh);
1148 x = ip->i_di.di_size + 1;
1150 *buf = kmalloc(x, GFP_KERNEL);
1157 memcpy(*buf, dibh->b_data + sizeof(struct gfs2_dinode), x);
1163 gfs2_glock_dq_uninit(&i_gh);
1168 * gfs2_glock_nq_atime - Acquire a hold on an inode's glock, and
1169 * conditionally update the inode's atime
1170 * @gh: the holder to acquire
1172 * Tests atime (access time) for gfs2_read, gfs2_readdir and gfs2_mmap
1173 * Update if the difference between the current time and the inode's current
1174 * atime is greater than an interval specified at mount.
1179 int gfs2_glock_nq_atime(struct gfs2_holder *gh)
1181 struct gfs2_glock *gl = gh->gh_gl;
1182 struct gfs2_sbd *sdp = gl->gl_sbd;
1183 struct gfs2_inode *ip = gl->gl_object;
1184 s64 curtime, quantum = gfs2_tune_get(sdp, gt_atime_quantum);
1189 if (gfs2_assert_warn(sdp, gh->gh_flags & GL_ATIME) ||
1190 gfs2_assert_warn(sdp, !(gh->gh_flags & GL_ASYNC)) ||
1191 gfs2_assert_warn(sdp, gl->gl_ops == &gfs2_inode_glops))
1194 state = gh->gh_state;
1195 flags = gh->gh_flags;
1197 error = gfs2_glock_nq(gh);
1201 if (test_bit(SDF_NOATIME, &sdp->sd_flags) ||
1202 (sdp->sd_vfs->s_flags & MS_RDONLY))
1205 curtime = get_seconds();
1206 if (curtime - ip->i_inode.i_atime.tv_sec >= quantum) {
1208 gfs2_holder_reinit(LM_ST_EXCLUSIVE, gh->gh_flags & ~LM_FLAG_ANY,
1210 error = gfs2_glock_nq(gh);
1214 /* Verify that atime hasn't been updated while we were
1215 trying to get exclusive lock. */
1217 curtime = get_seconds();
1218 if (curtime - ip->i_inode.i_atime.tv_sec >= quantum) {
1219 struct buffer_head *dibh;
1220 struct gfs2_dinode *di;
1222 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
1223 if (error == -EROFS)
1228 error = gfs2_meta_inode_buffer(ip, &dibh);
1230 goto fail_end_trans;
1232 ip->i_inode.i_atime.tv_sec = curtime;
1234 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1235 di = (struct gfs2_dinode *)dibh->b_data;
1236 di->di_atime = cpu_to_be64(ip->i_inode.i_atime.tv_sec);
1239 gfs2_trans_end(sdp);
1242 /* If someone else has asked for the glock,
1243 unlock and let them have it. Then reacquire
1244 in the original state. */
1245 if (gfs2_glock_is_blocking(gl)) {
1247 gfs2_holder_reinit(state, flags, gh);
1248 return gfs2_glock_nq(gh);
1255 gfs2_trans_end(sdp);
1262 * glock_compare_atime - Compare two struct gfs2_glock structures for sort
1263 * @arg_a: the first structure
1264 * @arg_b: the second structure
1266 * Returns: 1 if A > B
1271 static int glock_compare_atime(const void *arg_a, const void *arg_b)
1273 const struct gfs2_holder *gh_a = *(const struct gfs2_holder **)arg_a;
1274 const struct gfs2_holder *gh_b = *(const struct gfs2_holder **)arg_b;
1275 const struct lm_lockname *a = &gh_a->gh_gl->gl_name;
1276 const struct lm_lockname *b = &gh_b->gh_gl->gl_name;
1278 if (a->ln_number > b->ln_number)
1280 if (a->ln_number < b->ln_number)
1282 if (gh_a->gh_state == LM_ST_SHARED && gh_b->gh_state == LM_ST_EXCLUSIVE)
1284 if (gh_a->gh_state == LM_ST_SHARED && (gh_b->gh_flags & GL_ATIME))
1291 * gfs2_glock_nq_m_atime - acquire multiple glocks where one may need an
1293 * @num_gh: the number of structures
1294 * @ghs: an array of struct gfs2_holder structures
1296 * Returns: 0 on success (all glocks acquired),
1297 * errno on failure (no glocks acquired)
1300 int gfs2_glock_nq_m_atime(unsigned int num_gh, struct gfs2_holder *ghs)
1302 struct gfs2_holder **p;
1310 ghs->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC);
1311 if (ghs->gh_flags & GL_ATIME)
1312 error = gfs2_glock_nq_atime(ghs);
1314 error = gfs2_glock_nq(ghs);
1318 p = kcalloc(num_gh, sizeof(struct gfs2_holder *), GFP_KERNEL);
1322 for (x = 0; x < num_gh; x++)
1325 sort(p, num_gh, sizeof(struct gfs2_holder *), glock_compare_atime,NULL);
1327 for (x = 0; x < num_gh; x++) {
1328 p[x]->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC);
1330 if (p[x]->gh_flags & GL_ATIME)
1331 error = gfs2_glock_nq_atime(p[x]);
1333 error = gfs2_glock_nq(p[x]);
1337 gfs2_glock_dq(p[x]);
1348 __gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr)
1350 struct buffer_head *dibh;
1353 error = gfs2_meta_inode_buffer(ip, &dibh);
1355 error = inode_setattr(&ip->i_inode, attr);
1356 gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error);
1357 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1358 gfs2_dinode_out(ip, dibh->b_data);
1365 * gfs2_setattr_simple -
1369 * Called with a reference on the vnode.
1374 int gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr)
1378 if (current->journal_info)
1379 return __gfs2_setattr_simple(ip, attr);
1381 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE, 0);
1385 error = __gfs2_setattr_simple(ip, attr);
1386 gfs2_trans_end(GFS2_SB(&ip->i_inode));