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 * 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 static void inode_attr_in(struct gfs2_inode *ip, struct inode *inode)
49 inode->i_ino = ip->i_num.no_formal_ino;
51 switch (ip->i_di.di_mode & S_IFMT) {
54 inode->i_rdev = MKDEV(ip->i_di.di_major, ip->i_di.di_minor);
61 inode->i_mode = ip->i_di.di_mode;
62 inode->i_nlink = ip->i_di.di_nlink;
63 inode->i_uid = ip->i_di.di_uid;
64 inode->i_gid = ip->i_di.di_gid;
65 i_size_write(inode, ip->i_di.di_size);
66 inode->i_atime.tv_sec = ip->i_di.di_atime;
67 inode->i_mtime.tv_sec = ip->i_di.di_mtime;
68 inode->i_ctime.tv_sec = ip->i_di.di_ctime;
69 inode->i_atime.tv_nsec = 0;
70 inode->i_mtime.tv_nsec = 0;
71 inode->i_ctime.tv_nsec = 0;
72 inode->i_blksize = PAGE_SIZE;
73 inode->i_blocks = ip->i_di.di_blocks <<
74 (GFS2_SB(inode)->sd_sb.sb_bsize_shift - GFS2_BASIC_BLOCK_SHIFT);
76 if (ip->i_di.di_flags & GFS2_DIF_IMMUTABLE)
77 inode->i_flags |= S_IMMUTABLE;
79 inode->i_flags &= ~S_IMMUTABLE;
81 if (ip->i_di.di_flags & GFS2_DIF_APPENDONLY)
82 inode->i_flags |= S_APPEND;
84 inode->i_flags &= ~S_APPEND;
88 * gfs2_inode_attr_in - Copy attributes from the dinode into the VFS inode
89 * @ip: The GFS2 inode (with embedded disk inode data)
93 void gfs2_inode_attr_in(struct gfs2_inode *ip)
95 struct inode *inode = &ip->i_inode;
96 inode_attr_in(ip, inode);
100 * gfs2_inode_attr_out - Copy attributes from VFS inode into the dinode
101 * @ip: The GFS2 inode
103 * Only copy out the attributes that we want the VFS layer
104 * to be able to modify.
107 void gfs2_inode_attr_out(struct gfs2_inode *ip)
109 struct inode *inode = &ip->i_inode;
111 gfs2_assert_withdraw(GFS2_SB(inode),
112 (ip->i_di.di_mode & S_IFMT) == (inode->i_mode & S_IFMT));
113 ip->i_di.di_mode = inode->i_mode;
114 ip->i_di.di_uid = inode->i_uid;
115 ip->i_di.di_gid = inode->i_gid;
116 ip->i_di.di_atime = inode->i_atime.tv_sec;
117 ip->i_di.di_mtime = inode->i_mtime.tv_sec;
118 ip->i_di.di_ctime = inode->i_ctime.tv_sec;
121 static int iget_test(struct inode *inode, void *opaque)
123 struct gfs2_inode *ip = GFS2_I(inode);
124 struct gfs2_inum *inum = opaque;
126 if (ip && ip->i_num.no_addr == inum->no_addr)
132 static int iget_set(struct inode *inode, void *opaque)
134 struct gfs2_inode *ip = GFS2_I(inode);
135 struct gfs2_inum *inum = opaque;
141 struct inode *gfs2_ilookup(struct super_block *sb, struct gfs2_inum *inum)
143 return ilookup5(sb, (unsigned long)inum->no_formal_ino,
147 static struct inode *gfs2_iget(struct super_block *sb, struct gfs2_inum *inum)
149 return iget5_locked(sb, (unsigned long)inum->no_formal_ino,
150 iget_test, iget_set, inum);
154 * gfs2_inode_lookup - Lookup an inode
155 * @sb: The super block
156 * @inum: The inode number
157 * @type: The type of the inode
159 * Returns: A VFS inode, or an error
162 struct inode *gfs2_inode_lookup(struct super_block *sb, struct gfs2_inum *inum, unsigned int type)
164 struct inode *inode = gfs2_iget(sb, inum);
165 struct gfs2_inode *ip = GFS2_I(inode);
166 struct gfs2_glock *io_gl;
169 if (inode->i_state & I_NEW) {
170 struct gfs2_sbd *sdp = GFS2_SB(inode);
171 umode_t mode = DT2IF(type);
172 inode->u.generic_ip = ip;
173 inode->i_mode = mode;
176 inode->i_op = &gfs2_file_iops;
177 inode->i_fop = &gfs2_file_fops;
178 inode->i_mapping->a_ops = &gfs2_file_aops;
179 } else if (S_ISDIR(mode)) {
180 inode->i_op = &gfs2_dir_iops;
181 inode->i_fop = &gfs2_dir_fops;
182 } else if (S_ISLNK(mode)) {
183 inode->i_op = &gfs2_symlink_iops;
185 inode->i_op = &gfs2_dev_iops;
188 error = gfs2_glock_get(sdp, inum->no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
191 ip->i_gl->gl_object = ip;
193 error = gfs2_glock_get(sdp, inum->no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
197 ip->i_vn = ip->i_gl->gl_vn - 1;
198 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
202 gfs2_glock_put(io_gl);
203 unlock_new_inode(inode);
208 gfs2_glock_put(io_gl);
210 ip->i_gl->gl_object = NULL;
211 gfs2_glock_put(ip->i_gl);
214 return ERR_PTR(error);
218 * gfs2_inode_refresh - Refresh the incore copy of the dinode
219 * @ip: The GFS2 inode
224 int gfs2_inode_refresh(struct gfs2_inode *ip)
226 struct buffer_head *dibh;
229 error = gfs2_meta_inode_buffer(ip, &dibh);
233 if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), dibh, GFS2_METATYPE_DI)) {
238 gfs2_dinode_in(&ip->i_di, dibh->b_data);
239 set_bit(GIF_MIN_INIT, &ip->i_flags);
243 if (ip->i_num.no_addr != ip->i_di.di_num.no_addr) {
244 if (gfs2_consist_inode(ip))
245 gfs2_dinode_print(&ip->i_di);
248 if (ip->i_num.no_formal_ino != ip->i_di.di_num.no_formal_ino)
251 ip->i_vn = ip->i_gl->gl_vn;
256 int gfs2_dinode_dealloc(struct gfs2_inode *ip)
258 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
259 struct gfs2_alloc *al;
260 struct gfs2_rgrpd *rgd;
263 if (ip->i_di.di_blocks != 1) {
264 if (gfs2_consist_inode(ip))
265 gfs2_dinode_print(&ip->i_di);
269 al = gfs2_alloc_get(ip);
271 error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
275 error = gfs2_rindex_hold(sdp, &al->al_ri_gh);
279 rgd = gfs2_blk2rgrpd(sdp, ip->i_num.no_addr);
281 gfs2_consist_inode(ip);
283 goto out_rindex_relse;
286 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0,
289 goto out_rindex_relse;
291 error = gfs2_trans_begin(sdp, RES_RG_BIT +
292 RES_STATFS + RES_QUOTA, 1);
296 gfs2_trans_add_gl(ip->i_gl);
298 gfs2_free_di(rgd, ip);
301 clear_bit(GLF_STICKY, &ip->i_gl->gl_flags);
304 gfs2_glock_dq_uninit(&al->al_rgd_gh);
306 gfs2_glock_dq_uninit(&al->al_ri_gh);
308 gfs2_quota_unhold(ip);
315 * gfs2_change_nlink - Change nlink count on inode
316 * @ip: The GFS2 inode
317 * @diff: The change in the nlink count required
322 int gfs2_change_nlink(struct gfs2_inode *ip, int diff)
324 struct gfs2_sbd *sdp = ip->i_inode.i_sb->s_fs_info;
325 struct buffer_head *dibh;
329 nlink = ip->i_di.di_nlink + diff;
331 /* If we are reducing the nlink count, but the new value ends up being
332 bigger than the old one, we must have underflowed. */
333 if (diff < 0 && nlink > ip->i_di.di_nlink) {
334 if (gfs2_consist_inode(ip))
335 gfs2_dinode_print(&ip->i_di);
339 error = gfs2_meta_inode_buffer(ip, &dibh);
343 ip->i_di.di_nlink = nlink;
344 ip->i_di.di_ctime = get_seconds();
346 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
347 gfs2_dinode_out(&ip->i_di, dibh->b_data);
349 mark_inode_dirty(&ip->i_inode);
351 if (ip->i_di.di_nlink == 0) {
352 struct gfs2_rgrpd *rgd;
353 struct gfs2_holder ri_gh, rg_gh;
355 error = gfs2_rindex_hold(sdp, &ri_gh);
359 rgd = gfs2_blk2rgrpd(sdp, ip->i_num.no_addr);
362 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &rg_gh);
366 gfs2_unlink_di(&ip->i_inode); /* mark inode unlinked */
367 gfs2_glock_dq_uninit(&rg_gh);
369 gfs2_glock_dq_uninit(&ri_gh);
375 struct inode *gfs2_lookup_simple(struct inode *dip, const char *name)
378 gfs2_str2qstr(&qstr, name);
379 return gfs2_lookupi(dip, &qstr, 1, NULL);
384 * gfs2_lookupi - Look up a filename in a directory and return its inode
385 * @d_gh: An initialized holder for the directory glock
386 * @name: The name of the inode to look for
387 * @is_root: If 1, ignore the caller's permissions
388 * @i_gh: An uninitialized holder for the new inode glock
390 * There will always be a vnode (Linux VFS inode) for the d_gh inode unless
396 struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
397 int is_root, struct nameidata *nd)
400 struct super_block *sb = dir->i_sb;
401 struct gfs2_inode *dip = GFS2_I(dir);
402 struct gfs2_holder d_gh;
403 struct gfs2_inum inum;
406 struct inode *inode = NULL;
408 if (!name->len || name->len > GFS2_FNAMESIZE)
409 return ERR_PTR(-ENAMETOOLONG);
411 if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) ||
412 (name->len == 2 && memcmp(name->name, "..", 2) == 0 &&
413 dir == sb->s_root->d_inode)) {
418 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
420 return ERR_PTR(error);
423 error = permission(dir, MAY_EXEC, NULL);
428 error = gfs2_dir_search(dir, name, &inum, &type);
432 inode = gfs2_inode_lookup(sb, &inum, type);
435 gfs2_glock_dq_uninit(&d_gh);
436 if (error == -ENOENT)
441 static int pick_formal_ino_1(struct gfs2_sbd *sdp, uint64_t *formal_ino)
443 struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode);
444 struct buffer_head *bh;
445 struct gfs2_inum_range ir;
448 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
451 mutex_lock(&sdp->sd_inum_mutex);
453 error = gfs2_meta_inode_buffer(ip, &bh);
455 mutex_unlock(&sdp->sd_inum_mutex);
460 gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode));
463 *formal_ino = ir.ir_start++;
465 gfs2_trans_add_bh(ip->i_gl, bh, 1);
466 gfs2_inum_range_out(&ir,
467 bh->b_data + sizeof(struct gfs2_dinode));
469 mutex_unlock(&sdp->sd_inum_mutex);
476 mutex_unlock(&sdp->sd_inum_mutex);
482 static int pick_formal_ino_2(struct gfs2_sbd *sdp, uint64_t *formal_ino)
484 struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode);
485 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_inum_inode);
486 struct gfs2_holder gh;
487 struct buffer_head *bh;
488 struct gfs2_inum_range ir;
491 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
495 error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0);
498 mutex_lock(&sdp->sd_inum_mutex);
500 error = gfs2_meta_inode_buffer(ip, &bh);
504 gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode));
507 struct buffer_head *m_bh;
510 error = gfs2_meta_inode_buffer(m_ip, &m_bh);
514 x = *(uint64_t *)(m_bh->b_data + sizeof(struct gfs2_dinode));
515 x = y = be64_to_cpu(x);
517 ir.ir_length = GFS2_INUM_QUANTUM;
518 x += GFS2_INUM_QUANTUM;
520 gfs2_consist_inode(m_ip);
522 gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1);
523 *(uint64_t *)(m_bh->b_data + sizeof(struct gfs2_dinode)) = x;
528 *formal_ino = ir.ir_start++;
531 gfs2_trans_add_bh(ip->i_gl, bh, 1);
532 gfs2_inum_range_out(&ir, bh->b_data + sizeof(struct gfs2_dinode));
538 mutex_unlock(&sdp->sd_inum_mutex);
542 gfs2_glock_dq_uninit(&gh);
547 static int pick_formal_ino(struct gfs2_sbd *sdp, uint64_t *inum)
551 error = pick_formal_ino_1(sdp, inum);
555 error = pick_formal_ino_2(sdp, inum);
561 * create_ok - OK to create a new on-disk inode here?
562 * @dip: Directory in which dinode is to be created
563 * @name: Name of new dinode
569 static int create_ok(struct gfs2_inode *dip, const struct qstr *name,
574 error = permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL);
578 /* Don't create entries in an unlinked directory */
579 if (!dip->i_di.di_nlink)
582 error = gfs2_dir_search(&dip->i_inode, name, NULL, NULL);
593 if (dip->i_di.di_entries == (uint32_t)-1)
595 if (S_ISDIR(mode) && dip->i_di.di_nlink == (uint32_t)-1)
601 static void munge_mode_uid_gid(struct gfs2_inode *dip, unsigned int *mode,
602 unsigned int *uid, unsigned int *gid)
604 if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir &&
605 (dip->i_di.di_mode & S_ISUID) &&
609 else if (dip->i_di.di_uid != current->fsuid)
611 *uid = dip->i_di.di_uid;
613 *uid = current->fsuid;
615 if (dip->i_di.di_mode & S_ISGID) {
618 *gid = dip->i_di.di_gid;
620 *gid = current->fsgid;
623 static int alloc_dinode(struct gfs2_inode *dip, struct gfs2_inum *inum)
625 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
630 dip->i_alloc.al_requested = RES_DINODE;
631 error = gfs2_inplace_reserve(dip);
635 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS, 0);
639 inum->no_addr = gfs2_alloc_di(dip);
644 gfs2_inplace_release(dip);
653 * init_dinode - Fill in a new dinode structure
654 * @dip: the directory this inode is being created in
655 * @gl: The glock covering the new inode
656 * @inum: the inode number
657 * @mode: the file permissions
663 static void init_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
664 struct gfs2_inum *inum, unsigned int mode,
665 unsigned int uid, unsigned int gid)
667 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
668 struct gfs2_dinode *di;
669 struct buffer_head *dibh;
671 dibh = gfs2_meta_new(gl, inum->no_addr);
672 gfs2_trans_add_bh(gl, dibh, 1);
673 gfs2_metatype_set(dibh, GFS2_METATYPE_DI, GFS2_FORMAT_DI);
674 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
675 di = (struct gfs2_dinode *)dibh->b_data;
677 di->di_num.no_formal_ino = cpu_to_be64(inum->no_formal_ino);
678 di->di_num.no_addr = cpu_to_be64(inum->no_addr);
679 di->di_mode = cpu_to_be32(mode);
680 di->di_uid = cpu_to_be32(uid);
681 di->di_gid = cpu_to_be32(gid);
682 di->di_nlink = cpu_to_be32(0);
683 di->di_size = cpu_to_be64(0);
684 di->di_blocks = cpu_to_be64(1);
685 di->di_atime = di->di_mtime = di->di_ctime = cpu_to_be64(get_seconds());
686 di->di_major = di->di_minor = cpu_to_be32(0);
687 di->di_goal_meta = di->di_goal_data = cpu_to_be64(inum->no_addr);
688 di->__pad[0] = di->__pad[1] = 0;
689 di->di_flags = cpu_to_be32(0);
692 if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_JDATA) ||
693 gfs2_tune_get(sdp, gt_new_files_jdata))
694 di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA);
695 if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_DIRECTIO) ||
696 gfs2_tune_get(sdp, gt_new_files_directio))
697 di->di_flags |= cpu_to_be32(GFS2_DIF_DIRECTIO);
698 } else if (S_ISDIR(mode)) {
699 di->di_flags |= cpu_to_be32(dip->i_di.di_flags &
700 GFS2_DIF_INHERIT_DIRECTIO);
701 di->di_flags |= cpu_to_be32(dip->i_di.di_flags &
702 GFS2_DIF_INHERIT_JDATA);
706 di->di_height = cpu_to_be32(0);
709 di->di_depth = cpu_to_be16(0);
710 di->di_entries = cpu_to_be32(0);
711 memset(&di->__pad4, 0, sizeof(di->__pad4));
712 di->di_eattr = cpu_to_be64(0);
713 memset(&di->di_reserved, 0, sizeof(di->di_reserved));
718 static int make_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
719 unsigned int mode, struct gfs2_inum *inum)
721 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
722 unsigned int uid, gid;
725 munge_mode_uid_gid(dip, &mode, &uid, &gid);
728 error = gfs2_quota_lock(dip, uid, gid);
732 error = gfs2_quota_check(dip, uid, gid);
736 error = gfs2_trans_begin(sdp, RES_DINODE + RES_QUOTA, 0);
740 init_dinode(dip, gl, inum, mode, uid, gid);
741 gfs2_quota_change(dip, +1, uid, gid);
745 gfs2_quota_unlock(dip);
751 static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
752 struct gfs2_inode *ip)
754 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
755 struct gfs2_alloc *al;
757 struct buffer_head *dibh;
760 al = gfs2_alloc_get(dip);
762 error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
766 error = alloc_required = gfs2_diradd_alloc_required(&dip->i_inode, name);
767 if (alloc_required < 0)
769 if (alloc_required) {
770 error = gfs2_quota_check(dip, dip->i_di.di_uid,
773 goto fail_quota_locks;
775 al->al_requested = sdp->sd_max_dirres;
777 error = gfs2_inplace_reserve(dip);
779 goto fail_quota_locks;
781 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
782 al->al_rgd->rd_ri.ri_length +
784 RES_STATFS + RES_QUOTA, 0);
788 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
790 goto fail_quota_locks;
793 error = gfs2_dir_add(&dip->i_inode, name, &ip->i_num, IF2DT(ip->i_di.di_mode));
797 error = gfs2_meta_inode_buffer(ip, &dibh);
800 ip->i_di.di_nlink = 1;
801 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
802 gfs2_dinode_out(&ip->i_di, dibh->b_data);
810 if (dip->i_alloc.al_rgd)
811 gfs2_inplace_release(dip);
814 gfs2_quota_unlock(dip);
822 * gfs2_createi - Create a new inode
823 * @ghs: An array of two holders
824 * @name: The name of the new file
825 * @mode: the permissions on the new inode
827 * @ghs[0] is an initialized holder for the directory
828 * @ghs[1] is the holder for the inode lock
830 * If the return value is not NULL, the glocks on both the directory and the new
831 * file are held. A transaction has been started and an inplace reservation
837 struct inode *gfs2_createi(struct gfs2_holder *ghs, const struct qstr *name,
841 struct gfs2_inode *dip = ghs->gh_gl->gl_object;
842 struct inode *dir = &dip->i_inode;
843 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
844 struct gfs2_inum inum;
847 if (!name->len || name->len > GFS2_FNAMESIZE)
848 return ERR_PTR(-ENAMETOOLONG);
850 gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs);
851 error = gfs2_glock_nq(ghs);
855 error = create_ok(dip, name, mode);
859 error = pick_formal_ino(sdp, &inum.no_formal_ino);
863 error = alloc_dinode(dip, &inum);
867 if (inum.no_addr < dip->i_num.no_addr) {
870 error = gfs2_glock_nq_num(sdp, inum.no_addr,
871 &gfs2_inode_glops, LM_ST_EXCLUSIVE,
874 return ERR_PTR(error);
877 gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs);
878 error = gfs2_glock_nq(ghs);
880 gfs2_glock_dq_uninit(ghs + 1);
881 return ERR_PTR(error);
884 error = create_ok(dip, name, mode);
888 error = gfs2_glock_nq_num(sdp, inum.no_addr,
889 &gfs2_inode_glops, LM_ST_EXCLUSIVE,
895 error = make_dinode(dip, ghs[1].gh_gl, mode, &inum);
899 inode = gfs2_inode_lookup(dir->i_sb, &inum, IF2DT(mode));
903 error = gfs2_inode_refresh(GFS2_I(inode));
907 error = gfs2_acl_create(dip, GFS2_I(inode));
911 error = link_dinode(dip, name, GFS2_I(inode));
916 return ERR_PTR(-ENOMEM);
922 gfs2_glock_dq_uninit(ghs + 1);
926 return ERR_PTR(error);
930 * gfs2_rmdiri - Remove a directory
931 * @dip: The parent directory of the directory to be removed
932 * @name: The name of the directory to be removed
933 * @ip: The GFS2 inode of the directory to be removed
935 * Assumes Glocks on dip and ip are held
940 int gfs2_rmdiri(struct gfs2_inode *dip, const struct qstr *name,
941 struct gfs2_inode *ip)
946 if (ip->i_di.di_entries != 2) {
947 if (gfs2_consist_inode(ip))
948 gfs2_dinode_print(&ip->i_di);
952 error = gfs2_dir_del(dip, name);
956 error = gfs2_change_nlink(dip, -1);
960 gfs2_str2qstr(&dotname, ".");
961 error = gfs2_dir_del(ip, &dotname);
965 gfs2_str2qstr(&dotname, "..");
966 error = gfs2_dir_del(ip, &dotname);
970 error = gfs2_change_nlink(ip, -2);
978 * gfs2_unlink_ok - check to see that a inode is still in a directory
979 * @dip: the directory
980 * @name: the name of the file
983 * Assumes that the lock on (at least) @dip is held.
985 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
988 int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
989 struct gfs2_inode *ip)
991 struct gfs2_inum inum;
995 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
998 if ((dip->i_di.di_mode & S_ISVTX) &&
999 dip->i_di.di_uid != current->fsuid &&
1000 ip->i_di.di_uid != current->fsuid && !capable(CAP_FOWNER))
1003 if (IS_APPEND(&dip->i_inode))
1006 error = permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL);
1010 error = gfs2_dir_search(&dip->i_inode, name, &inum, &type);
1014 if (!gfs2_inum_equal(&inum, &ip->i_num))
1017 if (IF2DT(ip->i_di.di_mode) != type) {
1018 gfs2_consist_inode(dip);
1026 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1030 * Follow @to back to the root and make sure we don't encounter @this
1031 * Assumes we already hold the rename lock.
1036 int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1038 struct inode *dir = &to->i_inode;
1039 struct super_block *sb = dir->i_sb;
1044 gfs2_str2qstr(&dotdot, "..");
1049 if (dir == &this->i_inode) {
1053 if (dir == sb->s_root->d_inode) {
1058 tmp = gfs2_lookupi(dir, &dotdot, 1, NULL);
1060 error = PTR_ERR(tmp);
1074 * gfs2_readlinki - return the contents of a symlink
1075 * @ip: the symlink's inode
1076 * @buf: a pointer to the buffer to be filled
1077 * @len: a pointer to the length of @buf
1079 * If @buf is too small, a piece of memory is kmalloc()ed and needs
1080 * to be freed by the caller.
1085 int gfs2_readlinki(struct gfs2_inode *ip, char **buf, unsigned int *len)
1087 struct gfs2_holder i_gh;
1088 struct buffer_head *dibh;
1092 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &i_gh);
1093 error = gfs2_glock_nq_atime(&i_gh);
1095 gfs2_holder_uninit(&i_gh);
1099 if (!ip->i_di.di_size) {
1100 gfs2_consist_inode(ip);
1105 error = gfs2_meta_inode_buffer(ip, &dibh);
1109 x = ip->i_di.di_size + 1;
1111 *buf = kmalloc(x, GFP_KERNEL);
1118 memcpy(*buf, dibh->b_data + sizeof(struct gfs2_dinode), x);
1124 gfs2_glock_dq_uninit(&i_gh);
1129 * gfs2_glock_nq_atime - Acquire a hold on an inode's glock, and
1130 * conditionally update the inode's atime
1131 * @gh: the holder to acquire
1133 * Tests atime (access time) for gfs2_read, gfs2_readdir and gfs2_mmap
1134 * Update if the difference between the current time and the inode's current
1135 * atime is greater than an interval specified at mount.
1140 int gfs2_glock_nq_atime(struct gfs2_holder *gh)
1142 struct gfs2_glock *gl = gh->gh_gl;
1143 struct gfs2_sbd *sdp = gl->gl_sbd;
1144 struct gfs2_inode *ip = gl->gl_object;
1145 int64_t curtime, quantum = gfs2_tune_get(sdp, gt_atime_quantum);
1150 if (gfs2_assert_warn(sdp, gh->gh_flags & GL_ATIME) ||
1151 gfs2_assert_warn(sdp, !(gh->gh_flags & GL_ASYNC)) ||
1152 gfs2_assert_warn(sdp, gl->gl_ops == &gfs2_inode_glops))
1155 state = gh->gh_state;
1156 flags = gh->gh_flags;
1158 error = gfs2_glock_nq(gh);
1162 if (test_bit(SDF_NOATIME, &sdp->sd_flags) ||
1163 (sdp->sd_vfs->s_flags & MS_RDONLY))
1166 curtime = get_seconds();
1167 if (curtime - ip->i_di.di_atime >= quantum) {
1169 gfs2_holder_reinit(LM_ST_EXCLUSIVE, gh->gh_flags & ~LM_FLAG_ANY,
1171 error = gfs2_glock_nq(gh);
1175 /* Verify that atime hasn't been updated while we were
1176 trying to get exclusive lock. */
1178 curtime = get_seconds();
1179 if (curtime - ip->i_di.di_atime >= quantum) {
1180 struct buffer_head *dibh;
1182 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
1183 if (error == -EROFS)
1188 error = gfs2_meta_inode_buffer(ip, &dibh);
1190 goto fail_end_trans;
1192 ip->i_di.di_atime = curtime;
1194 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1195 gfs2_dinode_out(&ip->i_di, dibh->b_data);
1198 gfs2_trans_end(sdp);
1201 /* If someone else has asked for the glock,
1202 unlock and let them have it. Then reacquire
1203 in the original state. */
1204 if (gfs2_glock_is_blocking(gl)) {
1206 gfs2_holder_reinit(state, flags, gh);
1207 return gfs2_glock_nq(gh);
1214 gfs2_trans_end(sdp);
1221 * glock_compare_atime - Compare two struct gfs2_glock structures for sort
1222 * @arg_a: the first structure
1223 * @arg_b: the second structure
1225 * Returns: 1 if A > B
1230 static int glock_compare_atime(const void *arg_a, const void *arg_b)
1232 struct gfs2_holder *gh_a = *(struct gfs2_holder **)arg_a;
1233 struct gfs2_holder *gh_b = *(struct gfs2_holder **)arg_b;
1234 struct lm_lockname *a = &gh_a->gh_gl->gl_name;
1235 struct lm_lockname *b = &gh_b->gh_gl->gl_name;
1238 if (a->ln_number > b->ln_number)
1240 else if (a->ln_number < b->ln_number)
1243 if (gh_a->gh_state == LM_ST_SHARED &&
1244 gh_b->gh_state == LM_ST_EXCLUSIVE)
1246 else if (gh_a->gh_state == LM_ST_SHARED &&
1247 (gh_b->gh_flags & GL_ATIME))
1255 * gfs2_glock_nq_m_atime - acquire multiple glocks where one may need an
1257 * @num_gh: the number of structures
1258 * @ghs: an array of struct gfs2_holder structures
1260 * Returns: 0 on success (all glocks acquired),
1261 * errno on failure (no glocks acquired)
1264 int gfs2_glock_nq_m_atime(unsigned int num_gh, struct gfs2_holder *ghs)
1266 struct gfs2_holder **p;
1274 ghs->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC);
1275 if (ghs->gh_flags & GL_ATIME)
1276 error = gfs2_glock_nq_atime(ghs);
1278 error = gfs2_glock_nq(ghs);
1282 p = kcalloc(num_gh, sizeof(struct gfs2_holder *), GFP_KERNEL);
1286 for (x = 0; x < num_gh; x++)
1289 sort(p, num_gh, sizeof(struct gfs2_holder *), glock_compare_atime,NULL);
1291 for (x = 0; x < num_gh; x++) {
1292 p[x]->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC);
1294 if (p[x]->gh_flags & GL_ATIME)
1295 error = gfs2_glock_nq_atime(p[x]);
1297 error = gfs2_glock_nq(p[x]);
1301 gfs2_glock_dq(p[x]);
1313 __gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr)
1315 struct buffer_head *dibh;
1318 error = gfs2_meta_inode_buffer(ip, &dibh);
1320 error = inode_setattr(&ip->i_inode, attr);
1321 gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error);
1322 gfs2_inode_attr_out(ip);
1324 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1325 gfs2_dinode_out(&ip->i_di, dibh->b_data);
1332 * gfs2_setattr_simple -
1336 * Called with a reference on the vnode.
1341 int gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr)
1345 if (current->journal_info)
1346 return __gfs2_setattr_simple(ip, attr);
1348 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE, 0);
1352 error = __gfs2_setattr_simple(ip, attr);
1354 gfs2_trans_end(GFS2_SB(&ip->i_inode));