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>
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 + RES_STATFS + RES_QUOTA, 1);
284 gfs2_trans_add_gl(ip->i_gl);
286 gfs2_free_di(rgd, ip);
289 clear_bit(GLF_STICKY, &ip->i_gl->gl_flags);
292 gfs2_glock_dq_uninit(&al->al_rgd_gh);
294 gfs2_glock_dq_uninit(&al->al_ri_gh);
296 gfs2_quota_unhold(ip);
303 * gfs2_change_nlink - Change nlink count on inode
304 * @ip: The GFS2 inode
305 * @diff: The change in the nlink count required
310 int gfs2_change_nlink(struct gfs2_inode *ip, int diff)
312 struct gfs2_sbd *sdp = ip->i_inode.i_sb->s_fs_info;
313 struct buffer_head *dibh;
317 BUG_ON(ip->i_di.di_nlink != ip->i_inode.i_nlink);
318 nlink = ip->i_di.di_nlink + diff;
320 /* If we are reducing the nlink count, but the new value ends up being
321 bigger than the old one, we must have underflowed. */
322 if (diff < 0 && nlink > ip->i_di.di_nlink) {
323 if (gfs2_consist_inode(ip))
324 gfs2_dinode_print(&ip->i_di);
328 error = gfs2_meta_inode_buffer(ip, &dibh);
332 ip->i_di.di_nlink = nlink;
333 ip->i_di.di_ctime = get_seconds();
334 ip->i_inode.i_nlink = nlink;
336 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
337 gfs2_dinode_out(&ip->i_di, dibh->b_data);
339 mark_inode_dirty(&ip->i_inode);
341 if (ip->i_di.di_nlink == 0) {
342 struct gfs2_rgrpd *rgd;
343 struct gfs2_holder ri_gh, rg_gh;
345 error = gfs2_rindex_hold(sdp, &ri_gh);
349 rgd = gfs2_blk2rgrpd(sdp, ip->i_num.no_addr);
352 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &rg_gh);
356 gfs2_unlink_di(&ip->i_inode); /* mark inode unlinked */
357 gfs2_glock_dq_uninit(&rg_gh);
359 gfs2_glock_dq_uninit(&ri_gh);
365 struct inode *gfs2_lookup_simple(struct inode *dip, const char *name)
368 gfs2_str2qstr(&qstr, name);
369 return gfs2_lookupi(dip, &qstr, 1, NULL);
374 * gfs2_lookupi - Look up a filename in a directory and return its inode
375 * @d_gh: An initialized holder for the directory glock
376 * @name: The name of the inode to look for
377 * @is_root: If 1, ignore the caller's permissions
378 * @i_gh: An uninitialized holder for the new inode glock
380 * There will always be a vnode (Linux VFS inode) for the d_gh inode unless
386 struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
387 int is_root, struct nameidata *nd)
390 struct super_block *sb = dir->i_sb;
391 struct gfs2_inode *dip = GFS2_I(dir);
392 struct gfs2_holder d_gh;
393 struct gfs2_inum inum;
396 struct inode *inode = NULL;
398 if (!name->len || name->len > GFS2_FNAMESIZE)
399 return ERR_PTR(-ENAMETOOLONG);
401 if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) ||
402 (name->len == 2 && memcmp(name->name, "..", 2) == 0 &&
403 dir == sb->s_root->d_inode)) {
408 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
410 return ERR_PTR(error);
413 error = permission(dir, MAY_EXEC, NULL);
418 error = gfs2_dir_search(dir, name, &inum, &type);
422 inode = gfs2_inode_lookup(sb, &inum, type);
425 gfs2_glock_dq_uninit(&d_gh);
426 if (error == -ENOENT)
431 static int pick_formal_ino_1(struct gfs2_sbd *sdp, uint64_t *formal_ino)
433 struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode);
434 struct buffer_head *bh;
435 struct gfs2_inum_range ir;
438 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
441 mutex_lock(&sdp->sd_inum_mutex);
443 error = gfs2_meta_inode_buffer(ip, &bh);
445 mutex_unlock(&sdp->sd_inum_mutex);
450 gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode));
453 *formal_ino = ir.ir_start++;
455 gfs2_trans_add_bh(ip->i_gl, bh, 1);
456 gfs2_inum_range_out(&ir,
457 bh->b_data + sizeof(struct gfs2_dinode));
459 mutex_unlock(&sdp->sd_inum_mutex);
466 mutex_unlock(&sdp->sd_inum_mutex);
472 static int pick_formal_ino_2(struct gfs2_sbd *sdp, uint64_t *formal_ino)
474 struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode);
475 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_inum_inode);
476 struct gfs2_holder gh;
477 struct buffer_head *bh;
478 struct gfs2_inum_range ir;
481 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
485 error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0);
488 mutex_lock(&sdp->sd_inum_mutex);
490 error = gfs2_meta_inode_buffer(ip, &bh);
494 gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode));
497 struct buffer_head *m_bh;
500 error = gfs2_meta_inode_buffer(m_ip, &m_bh);
504 x = *(uint64_t *)(m_bh->b_data + sizeof(struct gfs2_dinode));
505 x = y = be64_to_cpu(x);
507 ir.ir_length = GFS2_INUM_QUANTUM;
508 x += GFS2_INUM_QUANTUM;
510 gfs2_consist_inode(m_ip);
512 gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1);
513 *(uint64_t *)(m_bh->b_data + sizeof(struct gfs2_dinode)) = x;
518 *formal_ino = ir.ir_start++;
521 gfs2_trans_add_bh(ip->i_gl, bh, 1);
522 gfs2_inum_range_out(&ir, bh->b_data + sizeof(struct gfs2_dinode));
527 mutex_unlock(&sdp->sd_inum_mutex);
530 gfs2_glock_dq_uninit(&gh);
534 static int pick_formal_ino(struct gfs2_sbd *sdp, uint64_t *inum)
538 error = pick_formal_ino_1(sdp, inum);
542 error = pick_formal_ino_2(sdp, inum);
548 * create_ok - OK to create a new on-disk inode here?
549 * @dip: Directory in which dinode is to be created
550 * @name: Name of new dinode
556 static int create_ok(struct gfs2_inode *dip, const struct qstr *name,
561 error = permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL);
565 /* Don't create entries in an unlinked directory */
566 if (!dip->i_di.di_nlink)
569 error = gfs2_dir_search(&dip->i_inode, name, NULL, NULL);
580 if (dip->i_di.di_entries == (uint32_t)-1)
582 if (S_ISDIR(mode) && dip->i_di.di_nlink == (uint32_t)-1)
588 static void munge_mode_uid_gid(struct gfs2_inode *dip, unsigned int *mode,
589 unsigned int *uid, unsigned int *gid)
591 if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir &&
592 (dip->i_di.di_mode & S_ISUID) && dip->i_di.di_uid) {
595 else if (dip->i_di.di_uid != current->fsuid)
597 *uid = dip->i_di.di_uid;
599 *uid = current->fsuid;
601 if (dip->i_di.di_mode & S_ISGID) {
604 *gid = dip->i_di.di_gid;
606 *gid = current->fsgid;
609 static int alloc_dinode(struct gfs2_inode *dip, struct gfs2_inum *inum,
612 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
617 dip->i_alloc.al_requested = RES_DINODE;
618 error = gfs2_inplace_reserve(dip);
622 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS, 0);
626 inum->no_addr = gfs2_alloc_di(dip, generation);
631 gfs2_inplace_release(dip);
638 * init_dinode - Fill in a new dinode structure
639 * @dip: the directory this inode is being created in
640 * @gl: The glock covering the new inode
641 * @inum: the inode number
642 * @mode: the file permissions
648 static void init_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
649 const struct gfs2_inum *inum, unsigned int mode,
650 unsigned int uid, unsigned int gid,
651 const u64 *generation)
653 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
654 struct gfs2_dinode *di;
655 struct buffer_head *dibh;
657 dibh = gfs2_meta_new(gl, inum->no_addr);
658 gfs2_trans_add_bh(gl, dibh, 1);
659 gfs2_metatype_set(dibh, GFS2_METATYPE_DI, GFS2_FORMAT_DI);
660 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
661 di = (struct gfs2_dinode *)dibh->b_data;
663 di->di_num.no_formal_ino = cpu_to_be64(inum->no_formal_ino);
664 di->di_num.no_addr = cpu_to_be64(inum->no_addr);
665 di->di_mode = cpu_to_be32(mode);
666 di->di_uid = cpu_to_be32(uid);
667 di->di_gid = cpu_to_be32(gid);
668 di->di_nlink = cpu_to_be32(0);
669 di->di_size = cpu_to_be64(0);
670 di->di_blocks = cpu_to_be64(1);
671 di->di_atime = di->di_mtime = di->di_ctime = cpu_to_be64(get_seconds());
672 di->di_major = di->di_minor = cpu_to_be32(0);
673 di->di_goal_meta = di->di_goal_data = cpu_to_be64(inum->no_addr);
674 di->di_generation = cpu_to_be64(*generation);
675 di->di_flags = cpu_to_be32(0);
678 if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_JDATA) ||
679 gfs2_tune_get(sdp, gt_new_files_jdata))
680 di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA);
681 if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_DIRECTIO) ||
682 gfs2_tune_get(sdp, gt_new_files_directio))
683 di->di_flags |= cpu_to_be32(GFS2_DIF_DIRECTIO);
684 } else if (S_ISDIR(mode)) {
685 di->di_flags |= cpu_to_be32(dip->i_di.di_flags &
686 GFS2_DIF_INHERIT_DIRECTIO);
687 di->di_flags |= cpu_to_be32(dip->i_di.di_flags &
688 GFS2_DIF_INHERIT_JDATA);
692 di->di_payload_format = cpu_to_be32(0);
693 di->di_height = cpu_to_be32(0);
696 di->di_depth = cpu_to_be16(0);
697 di->di_entries = cpu_to_be32(0);
698 memset(&di->__pad4, 0, sizeof(di->__pad4));
699 di->di_eattr = cpu_to_be64(0);
700 memset(&di->di_reserved, 0, sizeof(di->di_reserved));
705 static int make_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
706 unsigned int mode, const struct gfs2_inum *inum,
707 const u64 *generation)
709 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
710 unsigned int uid, gid;
713 munge_mode_uid_gid(dip, &mode, &uid, &gid);
716 error = gfs2_quota_lock(dip, uid, gid);
720 error = gfs2_quota_check(dip, uid, gid);
724 error = gfs2_trans_begin(sdp, RES_DINODE + RES_QUOTA, 0);
728 init_dinode(dip, gl, inum, mode, uid, gid, generation);
729 gfs2_quota_change(dip, +1, uid, gid);
733 gfs2_quota_unlock(dip);
739 static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
740 struct gfs2_inode *ip)
742 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
743 struct gfs2_alloc *al;
745 struct buffer_head *dibh;
748 al = gfs2_alloc_get(dip);
750 error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
754 error = alloc_required = gfs2_diradd_alloc_required(&dip->i_inode, name);
755 if (alloc_required < 0)
757 if (alloc_required) {
758 error = gfs2_quota_check(dip, dip->i_di.di_uid,
761 goto fail_quota_locks;
763 al->al_requested = sdp->sd_max_dirres;
765 error = gfs2_inplace_reserve(dip);
767 goto fail_quota_locks;
769 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
770 al->al_rgd->rd_ri.ri_length +
772 RES_STATFS + RES_QUOTA, 0);
776 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
778 goto fail_quota_locks;
781 error = gfs2_dir_add(&dip->i_inode, name, &ip->i_num, IF2DT(ip->i_di.di_mode));
785 error = gfs2_meta_inode_buffer(ip, &dibh);
788 ip->i_di.di_nlink = 1;
789 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
790 gfs2_dinode_out(&ip->i_di, dibh->b_data);
798 if (dip->i_alloc.al_rgd)
799 gfs2_inplace_release(dip);
802 gfs2_quota_unlock(dip);
810 * gfs2_createi - Create a new inode
811 * @ghs: An array of two holders
812 * @name: The name of the new file
813 * @mode: the permissions on the new inode
815 * @ghs[0] is an initialized holder for the directory
816 * @ghs[1] is the holder for the inode lock
818 * If the return value is not NULL, the glocks on both the directory and the new
819 * file are held. A transaction has been started and an inplace reservation
825 struct inode *gfs2_createi(struct gfs2_holder *ghs, const struct qstr *name,
829 struct gfs2_inode *dip = ghs->gh_gl->gl_object;
830 struct inode *dir = &dip->i_inode;
831 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
832 struct gfs2_inum inum;
836 if (!name->len || name->len > GFS2_FNAMESIZE)
837 return ERR_PTR(-ENAMETOOLONG);
839 gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs);
840 error = gfs2_glock_nq(ghs);
844 error = create_ok(dip, name, mode);
848 error = pick_formal_ino(sdp, &inum.no_formal_ino);
852 error = alloc_dinode(dip, &inum, &generation);
856 if (inum.no_addr < dip->i_num.no_addr) {
859 error = gfs2_glock_nq_num(sdp, inum.no_addr,
860 &gfs2_inode_glops, LM_ST_EXCLUSIVE,
863 return ERR_PTR(error);
866 gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs);
867 error = gfs2_glock_nq(ghs);
869 gfs2_glock_dq_uninit(ghs + 1);
870 return ERR_PTR(error);
873 error = create_ok(dip, name, mode);
877 error = gfs2_glock_nq_num(sdp, inum.no_addr,
878 &gfs2_inode_glops, LM_ST_EXCLUSIVE,
884 error = make_dinode(dip, ghs[1].gh_gl, mode, &inum, &generation);
888 inode = gfs2_inode_lookup(dir->i_sb, &inum, IF2DT(mode));
892 error = gfs2_inode_refresh(GFS2_I(inode));
896 error = gfs2_acl_create(dip, GFS2_I(inode));
900 error = link_dinode(dip, name, GFS2_I(inode));
905 return ERR_PTR(-ENOMEM);
911 gfs2_glock_dq_uninit(ghs + 1);
915 return ERR_PTR(error);
919 * gfs2_rmdiri - Remove a directory
920 * @dip: The parent directory of the directory to be removed
921 * @name: The name of the directory to be removed
922 * @ip: The GFS2 inode of the directory to be removed
924 * Assumes Glocks on dip and ip are held
929 int gfs2_rmdiri(struct gfs2_inode *dip, const struct qstr *name,
930 struct gfs2_inode *ip)
935 if (ip->i_di.di_entries != 2) {
936 if (gfs2_consist_inode(ip))
937 gfs2_dinode_print(&ip->i_di);
941 error = gfs2_dir_del(dip, name);
945 error = gfs2_change_nlink(dip, -1);
949 gfs2_str2qstr(&dotname, ".");
950 error = gfs2_dir_del(ip, &dotname);
954 gfs2_str2qstr(&dotname, "..");
955 error = gfs2_dir_del(ip, &dotname);
959 error = gfs2_change_nlink(ip, -2);
967 * gfs2_unlink_ok - check to see that a inode is still in a directory
968 * @dip: the directory
969 * @name: the name of the file
972 * Assumes that the lock on (at least) @dip is held.
974 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
977 int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
978 struct gfs2_inode *ip)
980 struct gfs2_inum inum;
984 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
987 if ((dip->i_di.di_mode & S_ISVTX) &&
988 dip->i_di.di_uid != current->fsuid &&
989 ip->i_di.di_uid != current->fsuid && !capable(CAP_FOWNER))
992 if (IS_APPEND(&dip->i_inode))
995 error = permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL);
999 error = gfs2_dir_search(&dip->i_inode, name, &inum, &type);
1003 if (!gfs2_inum_equal(&inum, &ip->i_num))
1006 if (IF2DT(ip->i_di.di_mode) != type) {
1007 gfs2_consist_inode(dip);
1015 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1019 * Follow @to back to the root and make sure we don't encounter @this
1020 * Assumes we already hold the rename lock.
1025 int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1027 struct inode *dir = &to->i_inode;
1028 struct super_block *sb = dir->i_sb;
1033 gfs2_str2qstr(&dotdot, "..");
1038 if (dir == &this->i_inode) {
1042 if (dir == sb->s_root->d_inode) {
1047 tmp = gfs2_lookupi(dir, &dotdot, 1, NULL);
1049 error = PTR_ERR(tmp);
1063 * gfs2_readlinki - return the contents of a symlink
1064 * @ip: the symlink's inode
1065 * @buf: a pointer to the buffer to be filled
1066 * @len: a pointer to the length of @buf
1068 * If @buf is too small, a piece of memory is kmalloc()ed and needs
1069 * to be freed by the caller.
1074 int gfs2_readlinki(struct gfs2_inode *ip, char **buf, unsigned int *len)
1076 struct gfs2_holder i_gh;
1077 struct buffer_head *dibh;
1081 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &i_gh);
1082 error = gfs2_glock_nq_atime(&i_gh);
1084 gfs2_holder_uninit(&i_gh);
1088 if (!ip->i_di.di_size) {
1089 gfs2_consist_inode(ip);
1094 error = gfs2_meta_inode_buffer(ip, &dibh);
1098 x = ip->i_di.di_size + 1;
1100 *buf = kmalloc(x, GFP_KERNEL);
1107 memcpy(*buf, dibh->b_data + sizeof(struct gfs2_dinode), x);
1113 gfs2_glock_dq_uninit(&i_gh);
1118 * gfs2_glock_nq_atime - Acquire a hold on an inode's glock, and
1119 * conditionally update the inode's atime
1120 * @gh: the holder to acquire
1122 * Tests atime (access time) for gfs2_read, gfs2_readdir and gfs2_mmap
1123 * Update if the difference between the current time and the inode's current
1124 * atime is greater than an interval specified at mount.
1129 int gfs2_glock_nq_atime(struct gfs2_holder *gh)
1131 struct gfs2_glock *gl = gh->gh_gl;
1132 struct gfs2_sbd *sdp = gl->gl_sbd;
1133 struct gfs2_inode *ip = gl->gl_object;
1134 int64_t curtime, quantum = gfs2_tune_get(sdp, gt_atime_quantum);
1139 if (gfs2_assert_warn(sdp, gh->gh_flags & GL_ATIME) ||
1140 gfs2_assert_warn(sdp, !(gh->gh_flags & GL_ASYNC)) ||
1141 gfs2_assert_warn(sdp, gl->gl_ops == &gfs2_inode_glops))
1144 state = gh->gh_state;
1145 flags = gh->gh_flags;
1147 error = gfs2_glock_nq(gh);
1151 if (test_bit(SDF_NOATIME, &sdp->sd_flags) ||
1152 (sdp->sd_vfs->s_flags & MS_RDONLY))
1155 curtime = get_seconds();
1156 if (curtime - ip->i_di.di_atime >= quantum) {
1158 gfs2_holder_reinit(LM_ST_EXCLUSIVE, gh->gh_flags & ~LM_FLAG_ANY,
1160 error = gfs2_glock_nq(gh);
1164 /* Verify that atime hasn't been updated while we were
1165 trying to get exclusive lock. */
1167 curtime = get_seconds();
1168 if (curtime - ip->i_di.di_atime >= quantum) {
1169 struct buffer_head *dibh;
1171 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
1172 if (error == -EROFS)
1177 error = gfs2_meta_inode_buffer(ip, &dibh);
1179 goto fail_end_trans;
1181 ip->i_di.di_atime = curtime;
1183 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1184 gfs2_dinode_out(&ip->i_di, dibh->b_data);
1187 gfs2_trans_end(sdp);
1190 /* If someone else has asked for the glock,
1191 unlock and let them have it. Then reacquire
1192 in the original state. */
1193 if (gfs2_glock_is_blocking(gl)) {
1195 gfs2_holder_reinit(state, flags, gh);
1196 return gfs2_glock_nq(gh);
1203 gfs2_trans_end(sdp);
1210 * glock_compare_atime - Compare two struct gfs2_glock structures for sort
1211 * @arg_a: the first structure
1212 * @arg_b: the second structure
1214 * Returns: 1 if A > B
1219 static int glock_compare_atime(const void *arg_a, const void *arg_b)
1221 struct gfs2_holder *gh_a = *(struct gfs2_holder **)arg_a;
1222 struct gfs2_holder *gh_b = *(struct gfs2_holder **)arg_b;
1223 struct lm_lockname *a = &gh_a->gh_gl->gl_name;
1224 struct lm_lockname *b = &gh_b->gh_gl->gl_name;
1227 if (a->ln_number > b->ln_number)
1229 else if (a->ln_number < b->ln_number)
1232 if (gh_a->gh_state == LM_ST_SHARED &&
1233 gh_b->gh_state == LM_ST_EXCLUSIVE)
1235 else if (gh_a->gh_state == LM_ST_SHARED &&
1236 (gh_b->gh_flags & GL_ATIME))
1244 * gfs2_glock_nq_m_atime - acquire multiple glocks where one may need an
1246 * @num_gh: the number of structures
1247 * @ghs: an array of struct gfs2_holder structures
1249 * Returns: 0 on success (all glocks acquired),
1250 * errno on failure (no glocks acquired)
1253 int gfs2_glock_nq_m_atime(unsigned int num_gh, struct gfs2_holder *ghs)
1255 struct gfs2_holder **p;
1263 ghs->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC);
1264 if (ghs->gh_flags & GL_ATIME)
1265 error = gfs2_glock_nq_atime(ghs);
1267 error = gfs2_glock_nq(ghs);
1271 p = kcalloc(num_gh, sizeof(struct gfs2_holder *), GFP_KERNEL);
1275 for (x = 0; x < num_gh; x++)
1278 sort(p, num_gh, sizeof(struct gfs2_holder *), glock_compare_atime,NULL);
1280 for (x = 0; x < num_gh; x++) {
1281 p[x]->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC);
1283 if (p[x]->gh_flags & GL_ATIME)
1284 error = gfs2_glock_nq_atime(p[x]);
1286 error = gfs2_glock_nq(p[x]);
1290 gfs2_glock_dq(p[x]);
1301 __gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr)
1303 struct buffer_head *dibh;
1306 error = gfs2_meta_inode_buffer(ip, &dibh);
1308 error = inode_setattr(&ip->i_inode, attr);
1309 gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error);
1310 gfs2_inode_attr_out(ip);
1312 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1313 gfs2_dinode_out(&ip->i_di, dibh->b_data);
1320 * gfs2_setattr_simple -
1324 * Called with a reference on the vnode.
1329 int gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr)
1333 if (current->journal_info)
1334 return __gfs2_setattr_simple(ip, attr);
1336 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE, 0);
1340 error = __gfs2_setattr_simple(ip, attr);
1341 gfs2_trans_end(GFS2_SB(&ip->i_inode));