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 v.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>
21 #include "lm_interface.h"
32 #include "ops_address.h"
34 #include "ops_inode.h"
41 * gfs2_inode_attr_in - Copy attributes from the dinode into the VFS inode
42 * @ip: The GFS2 inode (with embedded disk inode data)
43 * @inode: The Linux VFS inode
47 void gfs2_inode_attr_in(struct gfs2_inode *ip)
49 struct inode *inode = &ip->i_inode;
51 inode->i_ino = ip->i_num.no_addr;
53 switch (ip->i_di.di_mode & S_IFMT) {
56 inode->i_rdev = MKDEV(ip->i_di.di_major, ip->i_di.di_minor);
63 inode->i_mode = ip->i_di.di_mode;
64 inode->i_nlink = ip->i_di.di_nlink;
65 inode->i_uid = ip->i_di.di_uid;
66 inode->i_gid = ip->i_di.di_gid;
67 i_size_write(inode, ip->i_di.di_size);
68 inode->i_atime.tv_sec = ip->i_di.di_atime;
69 inode->i_mtime.tv_sec = ip->i_di.di_mtime;
70 inode->i_ctime.tv_sec = ip->i_di.di_ctime;
71 inode->i_atime.tv_nsec = 0;
72 inode->i_mtime.tv_nsec = 0;
73 inode->i_ctime.tv_nsec = 0;
74 inode->i_blksize = PAGE_SIZE;
75 inode->i_blocks = ip->i_di.di_blocks <<
76 (GFS2_SB(inode)->sd_sb.sb_bsize_shift - GFS2_BASIC_BLOCK_SHIFT);
78 if (ip->i_di.di_flags & GFS2_DIF_IMMUTABLE)
79 inode->i_flags |= S_IMMUTABLE;
81 inode->i_flags &= ~S_IMMUTABLE;
83 if (ip->i_di.di_flags & GFS2_DIF_APPENDONLY)
84 inode->i_flags |= S_APPEND;
86 inode->i_flags &= ~S_APPEND;
90 * gfs2_inode_attr_out - Copy attributes from VFS inode into the dinode
93 * Only copy out the attributes that we want the VFS layer
94 * to be able to modify.
97 void gfs2_inode_attr_out(struct gfs2_inode *ip)
99 struct inode *inode = &ip->i_inode;
101 gfs2_assert_withdraw(GFS2_SB(inode),
102 (ip->i_di.di_mode & S_IFMT) == (inode->i_mode & S_IFMT));
103 ip->i_di.di_mode = inode->i_mode;
104 ip->i_di.di_uid = inode->i_uid;
105 ip->i_di.di_gid = inode->i_gid;
106 ip->i_di.di_atime = inode->i_atime.tv_sec;
107 ip->i_di.di_mtime = inode->i_mtime.tv_sec;
108 ip->i_di.di_ctime = inode->i_ctime.tv_sec;
111 static int iget_test(struct inode *inode, void *opaque)
113 struct gfs2_inode *ip = GFS2_I(inode);
114 struct gfs2_inum *inum = opaque;
116 if (ip && ip->i_num.no_addr == inum->no_addr)
122 static int iget_set(struct inode *inode, void *opaque)
124 struct gfs2_inode *ip = GFS2_I(inode);
125 struct gfs2_inum *inum = opaque;
131 struct inode *gfs2_ilookup(struct super_block *sb, struct gfs2_inum *inum)
133 return ilookup5(sb, (unsigned long)inum->no_formal_ino,
137 static struct inode *gfs2_iget(struct super_block *sb, struct gfs2_inum *inum)
139 return iget5_locked(sb, (unsigned long)inum->no_formal_ino,
140 iget_test, iget_set, inum);
144 * gfs2_inode_lookup - Lookup an inode
145 * @sb: The super block
146 * @inum: The inode number
147 * @type: The type of the inode
149 * Returns: A VFS inode, or an error
152 struct inode *gfs2_inode_lookup(struct super_block *sb, struct gfs2_inum *inum, unsigned int type)
154 struct inode *inode = gfs2_iget(sb, inum);
155 struct gfs2_inode *ip = GFS2_I(inode);
156 struct gfs2_glock *io_gl;
159 if (inode->i_state & I_NEW) {
160 struct gfs2_sbd *sdp = GFS2_SB(inode);
161 umode_t mode = DT2IF(type);
162 inode->u.generic_ip = ip;
163 inode->i_mode = mode;
166 inode->i_op = &gfs2_file_iops;
167 inode->i_fop = &gfs2_file_fops;
168 inode->i_mapping->a_ops = &gfs2_file_aops;
169 } else if (S_ISDIR(mode)) {
170 inode->i_op = &gfs2_dir_iops;
171 inode->i_fop = &gfs2_dir_fops;
172 } else if (S_ISLNK(mode)) {
173 inode->i_op = &gfs2_symlink_iops;
175 inode->i_op = &gfs2_dev_iops;
178 error = gfs2_glock_get(sdp, inum->no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
181 ip->i_gl->gl_object = ip;
183 error = gfs2_glock_get(sdp, inum->no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
187 ip->i_vn = ip->i_gl->gl_vn - 1;
188 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
192 gfs2_glock_put(io_gl);
193 unlock_new_inode(inode);
198 gfs2_glock_put(io_gl);
200 ip->i_gl->gl_object = NULL;
201 gfs2_glock_put(ip->i_gl);
204 return ERR_PTR(error);
208 * gfs2_inode_refresh - Refresh the incore copy of the dinode
209 * @ip: The GFS2 inode
214 int gfs2_inode_refresh(struct gfs2_inode *ip)
216 struct buffer_head *dibh;
219 error = gfs2_meta_inode_buffer(ip, &dibh);
223 if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), dibh, GFS2_METATYPE_DI)) {
228 gfs2_dinode_in(&ip->i_di, dibh->b_data);
232 if (ip->i_num.no_addr != ip->i_di.di_num.no_addr) {
233 if (gfs2_consist_inode(ip))
234 gfs2_dinode_print(&ip->i_di);
237 if (ip->i_num.no_formal_ino != ip->i_di.di_num.no_formal_ino)
240 ip->i_vn = ip->i_gl->gl_vn;
245 int gfs2_dinode_dealloc(struct gfs2_inode *ip)
247 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
248 struct gfs2_alloc *al;
249 struct gfs2_rgrpd *rgd;
252 if (ip->i_di.di_blocks != 1) {
253 if (gfs2_consist_inode(ip))
254 gfs2_dinode_print(&ip->i_di);
258 al = gfs2_alloc_get(ip);
260 error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
264 error = gfs2_rindex_hold(sdp, &al->al_ri_gh);
268 rgd = gfs2_blk2rgrpd(sdp, ip->i_num.no_addr);
270 gfs2_consist_inode(ip);
272 goto out_rindex_relse;
275 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0,
278 goto out_rindex_relse;
280 error = gfs2_trans_begin(sdp, RES_RG_BIT +
281 RES_STATFS + RES_QUOTA, 1);
285 gfs2_trans_add_gl(ip->i_gl);
287 gfs2_free_di(rgd, ip);
290 clear_bit(GLF_STICKY, &ip->i_gl->gl_flags);
293 gfs2_glock_dq_uninit(&al->al_rgd_gh);
295 gfs2_glock_dq_uninit(&al->al_ri_gh);
297 gfs2_quota_unhold(ip);
304 * gfs2_change_nlink - Change nlink count on inode
305 * @ip: The GFS2 inode
306 * @diff: The change in the nlink count required
311 int gfs2_change_nlink(struct gfs2_inode *ip, int diff)
313 struct gfs2_sbd *sdp = ip->i_inode.i_sb->s_fs_info;
314 struct buffer_head *dibh;
318 BUG_ON(ip->i_di.di_nlink != ip->i_inode.i_nlink);
319 nlink = ip->i_di.di_nlink + diff;
321 /* If we are reducing the nlink count, but the new value ends up being
322 bigger than the old one, we must have underflowed. */
323 if (diff < 0 && nlink > ip->i_di.di_nlink) {
324 if (gfs2_consist_inode(ip))
325 gfs2_dinode_print(&ip->i_di);
329 error = gfs2_meta_inode_buffer(ip, &dibh);
333 ip->i_di.di_nlink = nlink;
334 ip->i_di.di_ctime = get_seconds();
335 ip->i_inode.i_nlink = nlink;
337 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
338 gfs2_dinode_out(&ip->i_di, dibh->b_data);
340 mark_inode_dirty(&ip->i_inode);
342 if (ip->i_di.di_nlink == 0) {
343 struct gfs2_rgrpd *rgd;
344 struct gfs2_holder ri_gh, rg_gh;
346 error = gfs2_rindex_hold(sdp, &ri_gh);
350 rgd = gfs2_blk2rgrpd(sdp, ip->i_num.no_addr);
353 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &rg_gh);
357 gfs2_unlink_di(&ip->i_inode); /* mark inode unlinked */
358 gfs2_glock_dq_uninit(&rg_gh);
360 gfs2_glock_dq_uninit(&ri_gh);
366 struct inode *gfs2_lookup_simple(struct inode *dip, const char *name)
369 gfs2_str2qstr(&qstr, name);
370 return gfs2_lookupi(dip, &qstr, 1, NULL);
375 * gfs2_lookupi - Look up a filename in a directory and return its inode
376 * @d_gh: An initialized holder for the directory glock
377 * @name: The name of the inode to look for
378 * @is_root: If 1, ignore the caller's permissions
379 * @i_gh: An uninitialized holder for the new inode glock
381 * There will always be a vnode (Linux VFS inode) for the d_gh inode unless
387 struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
388 int is_root, struct nameidata *nd)
391 struct super_block *sb = dir->i_sb;
392 struct gfs2_inode *dip = GFS2_I(dir);
393 struct gfs2_holder d_gh;
394 struct gfs2_inum inum;
397 struct inode *inode = NULL;
399 if (!name->len || name->len > GFS2_FNAMESIZE)
400 return ERR_PTR(-ENAMETOOLONG);
402 if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) ||
403 (name->len == 2 && memcmp(name->name, "..", 2) == 0 &&
404 dir == sb->s_root->d_inode)) {
409 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
411 return ERR_PTR(error);
414 error = permission(dir, MAY_EXEC, NULL);
419 error = gfs2_dir_search(dir, name, &inum, &type);
423 inode = gfs2_inode_lookup(sb, &inum, type);
426 gfs2_glock_dq_uninit(&d_gh);
427 if (error == -ENOENT)
432 static int pick_formal_ino_1(struct gfs2_sbd *sdp, uint64_t *formal_ino)
434 struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode);
435 struct buffer_head *bh;
436 struct gfs2_inum_range ir;
439 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
442 mutex_lock(&sdp->sd_inum_mutex);
444 error = gfs2_meta_inode_buffer(ip, &bh);
446 mutex_unlock(&sdp->sd_inum_mutex);
451 gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode));
454 *formal_ino = ir.ir_start++;
456 gfs2_trans_add_bh(ip->i_gl, bh, 1);
457 gfs2_inum_range_out(&ir,
458 bh->b_data + sizeof(struct gfs2_dinode));
460 mutex_unlock(&sdp->sd_inum_mutex);
467 mutex_unlock(&sdp->sd_inum_mutex);
473 static int pick_formal_ino_2(struct gfs2_sbd *sdp, uint64_t *formal_ino)
475 struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode);
476 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_inum_inode);
477 struct gfs2_holder gh;
478 struct buffer_head *bh;
479 struct gfs2_inum_range ir;
482 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
486 error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0);
489 mutex_lock(&sdp->sd_inum_mutex);
491 error = gfs2_meta_inode_buffer(ip, &bh);
495 gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode));
498 struct buffer_head *m_bh;
501 error = gfs2_meta_inode_buffer(m_ip, &m_bh);
505 x = *(uint64_t *)(m_bh->b_data + sizeof(struct gfs2_dinode));
506 x = y = be64_to_cpu(x);
508 ir.ir_length = GFS2_INUM_QUANTUM;
509 x += GFS2_INUM_QUANTUM;
511 gfs2_consist_inode(m_ip);
513 gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1);
514 *(uint64_t *)(m_bh->b_data + sizeof(struct gfs2_dinode)) = x;
519 *formal_ino = ir.ir_start++;
522 gfs2_trans_add_bh(ip->i_gl, bh, 1);
523 gfs2_inum_range_out(&ir, bh->b_data + sizeof(struct gfs2_dinode));
529 mutex_unlock(&sdp->sd_inum_mutex);
533 gfs2_glock_dq_uninit(&gh);
538 static int pick_formal_ino(struct gfs2_sbd *sdp, uint64_t *inum)
542 error = pick_formal_ino_1(sdp, inum);
546 error = pick_formal_ino_2(sdp, inum);
552 * create_ok - OK to create a new on-disk inode here?
553 * @dip: Directory in which dinode is to be created
554 * @name: Name of new dinode
560 static int create_ok(struct gfs2_inode *dip, const struct qstr *name,
565 error = permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL);
569 /* Don't create entries in an unlinked directory */
570 if (!dip->i_di.di_nlink)
573 error = gfs2_dir_search(&dip->i_inode, name, NULL, NULL);
584 if (dip->i_di.di_entries == (uint32_t)-1)
586 if (S_ISDIR(mode) && dip->i_di.di_nlink == (uint32_t)-1)
592 static void munge_mode_uid_gid(struct gfs2_inode *dip, unsigned int *mode,
593 unsigned int *uid, unsigned int *gid)
595 if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir &&
596 (dip->i_di.di_mode & S_ISUID) &&
600 else if (dip->i_di.di_uid != current->fsuid)
602 *uid = dip->i_di.di_uid;
604 *uid = current->fsuid;
606 if (dip->i_di.di_mode & S_ISGID) {
609 *gid = dip->i_di.di_gid;
611 *gid = current->fsgid;
614 static int alloc_dinode(struct gfs2_inode *dip, struct gfs2_inum *inum,
617 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
622 dip->i_alloc.al_requested = RES_DINODE;
623 error = gfs2_inplace_reserve(dip);
627 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS, 0);
631 inum->no_addr = gfs2_alloc_di(dip, generation);
636 gfs2_inplace_release(dip);
645 * init_dinode - Fill in a new dinode structure
646 * @dip: the directory this inode is being created in
647 * @gl: The glock covering the new inode
648 * @inum: the inode number
649 * @mode: the file permissions
655 static void init_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
656 const struct gfs2_inum *inum, unsigned int mode,
657 unsigned int uid, unsigned int gid,
658 const u64 *generation)
660 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
661 struct gfs2_dinode *di;
662 struct buffer_head *dibh;
664 dibh = gfs2_meta_new(gl, inum->no_addr);
665 gfs2_trans_add_bh(gl, dibh, 1);
666 gfs2_metatype_set(dibh, GFS2_METATYPE_DI, GFS2_FORMAT_DI);
667 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
668 di = (struct gfs2_dinode *)dibh->b_data;
670 di->di_num.no_formal_ino = cpu_to_be64(inum->no_formal_ino);
671 di->di_num.no_addr = cpu_to_be64(inum->no_addr);
672 di->di_mode = cpu_to_be32(mode);
673 di->di_uid = cpu_to_be32(uid);
674 di->di_gid = cpu_to_be32(gid);
675 di->di_nlink = cpu_to_be32(0);
676 di->di_size = cpu_to_be64(0);
677 di->di_blocks = cpu_to_be64(1);
678 di->di_atime = di->di_mtime = di->di_ctime = cpu_to_be64(get_seconds());
679 di->di_major = di->di_minor = cpu_to_be32(0);
680 di->di_goal_meta = di->di_goal_data = cpu_to_be64(inum->no_addr);
681 di->di_generation = cpu_to_be64(*generation);
682 di->di_flags = cpu_to_be32(0);
685 if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_JDATA) ||
686 gfs2_tune_get(sdp, gt_new_files_jdata))
687 di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA);
688 if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_DIRECTIO) ||
689 gfs2_tune_get(sdp, gt_new_files_directio))
690 di->di_flags |= cpu_to_be32(GFS2_DIF_DIRECTIO);
691 } else if (S_ISDIR(mode)) {
692 di->di_flags |= cpu_to_be32(dip->i_di.di_flags &
693 GFS2_DIF_INHERIT_DIRECTIO);
694 di->di_flags |= cpu_to_be32(dip->i_di.di_flags &
695 GFS2_DIF_INHERIT_JDATA);
699 di->di_height = cpu_to_be32(0);
702 di->di_depth = cpu_to_be16(0);
703 di->di_entries = cpu_to_be32(0);
704 memset(&di->__pad4, 0, sizeof(di->__pad4));
705 di->di_eattr = cpu_to_be64(0);
706 memset(&di->di_reserved, 0, sizeof(di->di_reserved));
711 static int make_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
712 unsigned int mode, const struct gfs2_inum *inum,
713 const u64 *generation)
715 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
716 unsigned int uid, gid;
719 munge_mode_uid_gid(dip, &mode, &uid, &gid);
722 error = gfs2_quota_lock(dip, uid, gid);
726 error = gfs2_quota_check(dip, uid, gid);
730 error = gfs2_trans_begin(sdp, RES_DINODE + RES_QUOTA, 0);
734 init_dinode(dip, gl, inum, mode, uid, gid, generation);
735 gfs2_quota_change(dip, +1, uid, gid);
739 gfs2_quota_unlock(dip);
745 static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
746 struct gfs2_inode *ip)
748 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
749 struct gfs2_alloc *al;
751 struct buffer_head *dibh;
754 al = gfs2_alloc_get(dip);
756 error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
760 error = alloc_required = gfs2_diradd_alloc_required(&dip->i_inode, name);
761 if (alloc_required < 0)
763 if (alloc_required) {
764 error = gfs2_quota_check(dip, dip->i_di.di_uid,
767 goto fail_quota_locks;
769 al->al_requested = sdp->sd_max_dirres;
771 error = gfs2_inplace_reserve(dip);
773 goto fail_quota_locks;
775 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
776 al->al_rgd->rd_ri.ri_length +
778 RES_STATFS + RES_QUOTA, 0);
782 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
784 goto fail_quota_locks;
787 error = gfs2_dir_add(&dip->i_inode, name, &ip->i_num, IF2DT(ip->i_di.di_mode));
791 error = gfs2_meta_inode_buffer(ip, &dibh);
794 ip->i_di.di_nlink = 1;
795 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
796 gfs2_dinode_out(&ip->i_di, dibh->b_data);
804 if (dip->i_alloc.al_rgd)
805 gfs2_inplace_release(dip);
808 gfs2_quota_unlock(dip);
816 * gfs2_createi - Create a new inode
817 * @ghs: An array of two holders
818 * @name: The name of the new file
819 * @mode: the permissions on the new inode
821 * @ghs[0] is an initialized holder for the directory
822 * @ghs[1] is the holder for the inode lock
824 * If the return value is not NULL, the glocks on both the directory and the new
825 * file are held. A transaction has been started and an inplace reservation
831 struct inode *gfs2_createi(struct gfs2_holder *ghs, const struct qstr *name,
835 struct gfs2_inode *dip = ghs->gh_gl->gl_object;
836 struct inode *dir = &dip->i_inode;
837 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
838 struct gfs2_inum inum;
842 if (!name->len || name->len > GFS2_FNAMESIZE)
843 return ERR_PTR(-ENAMETOOLONG);
845 gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs);
846 error = gfs2_glock_nq(ghs);
850 error = create_ok(dip, name, mode);
854 error = pick_formal_ino(sdp, &inum.no_formal_ino);
858 error = alloc_dinode(dip, &inum, &generation);
862 if (inum.no_addr < dip->i_num.no_addr) {
865 error = gfs2_glock_nq_num(sdp, inum.no_addr,
866 &gfs2_inode_glops, LM_ST_EXCLUSIVE,
869 return ERR_PTR(error);
872 gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs);
873 error = gfs2_glock_nq(ghs);
875 gfs2_glock_dq_uninit(ghs + 1);
876 return ERR_PTR(error);
879 error = create_ok(dip, name, mode);
883 error = gfs2_glock_nq_num(sdp, inum.no_addr,
884 &gfs2_inode_glops, LM_ST_EXCLUSIVE,
890 error = make_dinode(dip, ghs[1].gh_gl, mode, &inum, &generation);
894 inode = gfs2_inode_lookup(dir->i_sb, &inum, IF2DT(mode));
898 error = gfs2_inode_refresh(GFS2_I(inode));
902 error = gfs2_acl_create(dip, GFS2_I(inode));
906 error = link_dinode(dip, name, GFS2_I(inode));
911 return ERR_PTR(-ENOMEM);
917 gfs2_glock_dq_uninit(ghs + 1);
921 return ERR_PTR(error);
925 * gfs2_rmdiri - Remove a directory
926 * @dip: The parent directory of the directory to be removed
927 * @name: The name of the directory to be removed
928 * @ip: The GFS2 inode of the directory to be removed
930 * Assumes Glocks on dip and ip are held
935 int gfs2_rmdiri(struct gfs2_inode *dip, const struct qstr *name,
936 struct gfs2_inode *ip)
941 if (ip->i_di.di_entries != 2) {
942 if (gfs2_consist_inode(ip))
943 gfs2_dinode_print(&ip->i_di);
947 error = gfs2_dir_del(dip, name);
951 error = gfs2_change_nlink(dip, -1);
955 gfs2_str2qstr(&dotname, ".");
956 error = gfs2_dir_del(ip, &dotname);
960 gfs2_str2qstr(&dotname, "..");
961 error = gfs2_dir_del(ip, &dotname);
965 error = gfs2_change_nlink(ip, -2);
973 * gfs2_unlink_ok - check to see that a inode is still in a directory
974 * @dip: the directory
975 * @name: the name of the file
978 * Assumes that the lock on (at least) @dip is held.
980 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
983 int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
984 struct gfs2_inode *ip)
986 struct gfs2_inum inum;
990 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
993 if ((dip->i_di.di_mode & S_ISVTX) &&
994 dip->i_di.di_uid != current->fsuid &&
995 ip->i_di.di_uid != current->fsuid && !capable(CAP_FOWNER))
998 if (IS_APPEND(&dip->i_inode))
1001 error = permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL);
1005 error = gfs2_dir_search(&dip->i_inode, name, &inum, &type);
1009 if (!gfs2_inum_equal(&inum, &ip->i_num))
1012 if (IF2DT(ip->i_di.di_mode) != type) {
1013 gfs2_consist_inode(dip);
1021 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1025 * Follow @to back to the root and make sure we don't encounter @this
1026 * Assumes we already hold the rename lock.
1031 int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1033 struct inode *dir = &to->i_inode;
1034 struct super_block *sb = dir->i_sb;
1039 gfs2_str2qstr(&dotdot, "..");
1044 if (dir == &this->i_inode) {
1048 if (dir == sb->s_root->d_inode) {
1053 tmp = gfs2_lookupi(dir, &dotdot, 1, NULL);
1055 error = PTR_ERR(tmp);
1069 * gfs2_readlinki - return the contents of a symlink
1070 * @ip: the symlink's inode
1071 * @buf: a pointer to the buffer to be filled
1072 * @len: a pointer to the length of @buf
1074 * If @buf is too small, a piece of memory is kmalloc()ed and needs
1075 * to be freed by the caller.
1080 int gfs2_readlinki(struct gfs2_inode *ip, char **buf, unsigned int *len)
1082 struct gfs2_holder i_gh;
1083 struct buffer_head *dibh;
1087 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &i_gh);
1088 error = gfs2_glock_nq_atime(&i_gh);
1090 gfs2_holder_uninit(&i_gh);
1094 if (!ip->i_di.di_size) {
1095 gfs2_consist_inode(ip);
1100 error = gfs2_meta_inode_buffer(ip, &dibh);
1104 x = ip->i_di.di_size + 1;
1106 *buf = kmalloc(x, GFP_KERNEL);
1113 memcpy(*buf, dibh->b_data + sizeof(struct gfs2_dinode), x);
1119 gfs2_glock_dq_uninit(&i_gh);
1124 * gfs2_glock_nq_atime - Acquire a hold on an inode's glock, and
1125 * conditionally update the inode's atime
1126 * @gh: the holder to acquire
1128 * Tests atime (access time) for gfs2_read, gfs2_readdir and gfs2_mmap
1129 * Update if the difference between the current time and the inode's current
1130 * atime is greater than an interval specified at mount.
1135 int gfs2_glock_nq_atime(struct gfs2_holder *gh)
1137 struct gfs2_glock *gl = gh->gh_gl;
1138 struct gfs2_sbd *sdp = gl->gl_sbd;
1139 struct gfs2_inode *ip = gl->gl_object;
1140 int64_t curtime, quantum = gfs2_tune_get(sdp, gt_atime_quantum);
1145 if (gfs2_assert_warn(sdp, gh->gh_flags & GL_ATIME) ||
1146 gfs2_assert_warn(sdp, !(gh->gh_flags & GL_ASYNC)) ||
1147 gfs2_assert_warn(sdp, gl->gl_ops == &gfs2_inode_glops))
1150 state = gh->gh_state;
1151 flags = gh->gh_flags;
1153 error = gfs2_glock_nq(gh);
1157 if (test_bit(SDF_NOATIME, &sdp->sd_flags) ||
1158 (sdp->sd_vfs->s_flags & MS_RDONLY))
1161 curtime = get_seconds();
1162 if (curtime - ip->i_di.di_atime >= quantum) {
1164 gfs2_holder_reinit(LM_ST_EXCLUSIVE, gh->gh_flags & ~LM_FLAG_ANY,
1166 error = gfs2_glock_nq(gh);
1170 /* Verify that atime hasn't been updated while we were
1171 trying to get exclusive lock. */
1173 curtime = get_seconds();
1174 if (curtime - ip->i_di.di_atime >= quantum) {
1175 struct buffer_head *dibh;
1177 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
1178 if (error == -EROFS)
1183 error = gfs2_meta_inode_buffer(ip, &dibh);
1185 goto fail_end_trans;
1187 ip->i_di.di_atime = curtime;
1189 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1190 gfs2_dinode_out(&ip->i_di, dibh->b_data);
1193 gfs2_trans_end(sdp);
1196 /* If someone else has asked for the glock,
1197 unlock and let them have it. Then reacquire
1198 in the original state. */
1199 if (gfs2_glock_is_blocking(gl)) {
1201 gfs2_holder_reinit(state, flags, gh);
1202 return gfs2_glock_nq(gh);
1209 gfs2_trans_end(sdp);
1216 * glock_compare_atime - Compare two struct gfs2_glock structures for sort
1217 * @arg_a: the first structure
1218 * @arg_b: the second structure
1220 * Returns: 1 if A > B
1225 static int glock_compare_atime(const void *arg_a, const void *arg_b)
1227 struct gfs2_holder *gh_a = *(struct gfs2_holder **)arg_a;
1228 struct gfs2_holder *gh_b = *(struct gfs2_holder **)arg_b;
1229 struct lm_lockname *a = &gh_a->gh_gl->gl_name;
1230 struct lm_lockname *b = &gh_b->gh_gl->gl_name;
1233 if (a->ln_number > b->ln_number)
1235 else if (a->ln_number < b->ln_number)
1238 if (gh_a->gh_state == LM_ST_SHARED &&
1239 gh_b->gh_state == LM_ST_EXCLUSIVE)
1241 else if (gh_a->gh_state == LM_ST_SHARED &&
1242 (gh_b->gh_flags & GL_ATIME))
1250 * gfs2_glock_nq_m_atime - acquire multiple glocks where one may need an
1252 * @num_gh: the number of structures
1253 * @ghs: an array of struct gfs2_holder structures
1255 * Returns: 0 on success (all glocks acquired),
1256 * errno on failure (no glocks acquired)
1259 int gfs2_glock_nq_m_atime(unsigned int num_gh, struct gfs2_holder *ghs)
1261 struct gfs2_holder **p;
1269 ghs->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC);
1270 if (ghs->gh_flags & GL_ATIME)
1271 error = gfs2_glock_nq_atime(ghs);
1273 error = gfs2_glock_nq(ghs);
1277 p = kcalloc(num_gh, sizeof(struct gfs2_holder *), GFP_KERNEL);
1281 for (x = 0; x < num_gh; x++)
1284 sort(p, num_gh, sizeof(struct gfs2_holder *), glock_compare_atime,NULL);
1286 for (x = 0; x < num_gh; x++) {
1287 p[x]->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC);
1289 if (p[x]->gh_flags & GL_ATIME)
1290 error = gfs2_glock_nq_atime(p[x]);
1292 error = gfs2_glock_nq(p[x]);
1296 gfs2_glock_dq(p[x]);
1308 __gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr)
1310 struct buffer_head *dibh;
1313 error = gfs2_meta_inode_buffer(ip, &dibh);
1315 error = inode_setattr(&ip->i_inode, attr);
1316 gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error);
1317 gfs2_inode_attr_out(ip);
1319 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1320 gfs2_dinode_out(&ip->i_di, dibh->b_data);
1327 * gfs2_setattr_simple -
1331 * Called with a reference on the vnode.
1336 int gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr)
1340 if (current->journal_info)
1341 return __gfs2_setattr_simple(ip, attr);
1343 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE, 0);
1347 error = __gfs2_setattr_simple(ip, attr);
1349 gfs2_trans_end(GFS2_SB(&ip->i_inode));