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);
242 if (ip->i_num.no_addr != ip->i_di.di_num.no_addr) {
243 if (gfs2_consist_inode(ip))
244 gfs2_dinode_print(&ip->i_di);
247 if (ip->i_num.no_formal_ino != ip->i_di.di_num.no_formal_ino)
250 ip->i_vn = ip->i_gl->gl_vn;
255 int gfs2_dinode_dealloc(struct gfs2_inode *ip)
257 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
258 struct gfs2_alloc *al;
259 struct gfs2_rgrpd *rgd;
262 if (ip->i_di.di_blocks != 1) {
263 if (gfs2_consist_inode(ip))
264 gfs2_dinode_print(&ip->i_di);
268 al = gfs2_alloc_get(ip);
270 error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
274 error = gfs2_rindex_hold(sdp, &al->al_ri_gh);
278 rgd = gfs2_blk2rgrpd(sdp, ip->i_num.no_addr);
280 gfs2_consist_inode(ip);
282 goto out_rindex_relse;
285 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0,
288 goto out_rindex_relse;
290 error = gfs2_trans_begin(sdp, RES_RG_BIT +
291 RES_STATFS + RES_QUOTA, 1);
295 gfs2_trans_add_gl(ip->i_gl);
297 gfs2_free_di(rgd, ip);
300 clear_bit(GLF_STICKY, &ip->i_gl->gl_flags);
303 gfs2_glock_dq_uninit(&al->al_rgd_gh);
305 gfs2_glock_dq_uninit(&al->al_ri_gh);
307 gfs2_quota_unhold(ip);
314 * gfs2_change_nlink - Change nlink count on inode
315 * @ip: The GFS2 inode
316 * @diff: The change in the nlink count required
321 int gfs2_change_nlink(struct gfs2_inode *ip, int diff)
323 struct gfs2_sbd *sdp = ip->i_inode.i_sb->s_fs_info;
324 struct buffer_head *dibh;
328 nlink = ip->i_di.di_nlink + diff;
330 /* If we are reducing the nlink count, but the new value ends up being
331 bigger than the old one, we must have underflowed. */
332 if (diff < 0 && nlink > ip->i_di.di_nlink) {
333 if (gfs2_consist_inode(ip))
334 gfs2_dinode_print(&ip->i_di);
338 error = gfs2_meta_inode_buffer(ip, &dibh);
342 ip->i_di.di_nlink = nlink;
343 ip->i_di.di_ctime = get_seconds();
345 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
346 gfs2_dinode_out(&ip->i_di, dibh->b_data);
348 mark_inode_dirty(&ip->i_inode);
350 if (ip->i_di.di_nlink == 0) {
351 struct gfs2_rgrpd *rgd;
352 struct gfs2_holder ri_gh, rg_gh;
354 error = gfs2_rindex_hold(sdp, &ri_gh);
358 rgd = gfs2_blk2rgrpd(sdp, ip->i_num.no_addr);
361 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &rg_gh);
365 gfs2_unlink_di(&ip->i_inode); /* mark inode unlinked */
366 gfs2_glock_dq_uninit(&rg_gh);
368 gfs2_glock_dq_uninit(&ri_gh);
374 struct inode *gfs2_lookup_simple(struct inode *dip, const char *name)
377 gfs2_str2qstr(&qstr, name);
378 return gfs2_lookupi(dip, &qstr, 1, NULL);
383 * gfs2_lookupi - Look up a filename in a directory and return its inode
384 * @d_gh: An initialized holder for the directory glock
385 * @name: The name of the inode to look for
386 * @is_root: If 1, ignore the caller's permissions
387 * @i_gh: An uninitialized holder for the new inode glock
389 * There will always be a vnode (Linux VFS inode) for the d_gh inode unless
395 struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
396 int is_root, struct nameidata *nd)
399 struct super_block *sb = dir->i_sb;
400 struct gfs2_inode *dip = GFS2_I(dir);
401 struct gfs2_holder d_gh;
402 struct gfs2_inum inum;
405 struct inode *inode = NULL;
407 if (!name->len || name->len > GFS2_FNAMESIZE)
408 return ERR_PTR(-ENAMETOOLONG);
410 if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) ||
411 (name->len == 2 && memcmp(name->name, "..", 2) == 0 &&
412 dir == sb->s_root->d_inode)) {
417 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
419 return ERR_PTR(error);
422 error = permission(dir, MAY_EXEC, NULL);
427 error = gfs2_dir_search(dir, name, &inum, &type);
431 inode = gfs2_inode_lookup(sb, &inum, type);
434 gfs2_glock_dq_uninit(&d_gh);
435 if (error == -ENOENT)
440 static int pick_formal_ino_1(struct gfs2_sbd *sdp, uint64_t *formal_ino)
442 struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode);
443 struct buffer_head *bh;
444 struct gfs2_inum_range ir;
447 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
450 mutex_lock(&sdp->sd_inum_mutex);
452 error = gfs2_meta_inode_buffer(ip, &bh);
454 mutex_unlock(&sdp->sd_inum_mutex);
459 gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode));
462 *formal_ino = ir.ir_start++;
464 gfs2_trans_add_bh(ip->i_gl, bh, 1);
465 gfs2_inum_range_out(&ir,
466 bh->b_data + sizeof(struct gfs2_dinode));
468 mutex_unlock(&sdp->sd_inum_mutex);
475 mutex_unlock(&sdp->sd_inum_mutex);
481 static int pick_formal_ino_2(struct gfs2_sbd *sdp, uint64_t *formal_ino)
483 struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode);
484 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_inum_inode);
485 struct gfs2_holder gh;
486 struct buffer_head *bh;
487 struct gfs2_inum_range ir;
490 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
494 error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0);
497 mutex_lock(&sdp->sd_inum_mutex);
499 error = gfs2_meta_inode_buffer(ip, &bh);
503 gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode));
506 struct buffer_head *m_bh;
509 error = gfs2_meta_inode_buffer(m_ip, &m_bh);
513 x = *(uint64_t *)(m_bh->b_data + sizeof(struct gfs2_dinode));
514 x = y = be64_to_cpu(x);
516 ir.ir_length = GFS2_INUM_QUANTUM;
517 x += GFS2_INUM_QUANTUM;
519 gfs2_consist_inode(m_ip);
521 gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1);
522 *(uint64_t *)(m_bh->b_data + sizeof(struct gfs2_dinode)) = x;
527 *formal_ino = ir.ir_start++;
530 gfs2_trans_add_bh(ip->i_gl, bh, 1);
531 gfs2_inum_range_out(&ir, bh->b_data + sizeof(struct gfs2_dinode));
537 mutex_unlock(&sdp->sd_inum_mutex);
541 gfs2_glock_dq_uninit(&gh);
546 static int pick_formal_ino(struct gfs2_sbd *sdp, uint64_t *inum)
550 error = pick_formal_ino_1(sdp, inum);
554 error = pick_formal_ino_2(sdp, inum);
560 * create_ok - OK to create a new on-disk inode here?
561 * @dip: Directory in which dinode is to be created
562 * @name: Name of new dinode
568 static int create_ok(struct gfs2_inode *dip, const struct qstr *name,
573 error = permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL);
577 /* Don't create entries in an unlinked directory */
578 if (!dip->i_di.di_nlink)
581 error = gfs2_dir_search(&dip->i_inode, name, NULL, NULL);
592 if (dip->i_di.di_entries == (uint32_t)-1)
594 if (S_ISDIR(mode) && dip->i_di.di_nlink == (uint32_t)-1)
600 static void munge_mode_uid_gid(struct gfs2_inode *dip, unsigned int *mode,
601 unsigned int *uid, unsigned int *gid)
603 if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir &&
604 (dip->i_di.di_mode & S_ISUID) &&
608 else if (dip->i_di.di_uid != current->fsuid)
610 *uid = dip->i_di.di_uid;
612 *uid = current->fsuid;
614 if (dip->i_di.di_mode & S_ISGID) {
617 *gid = dip->i_di.di_gid;
619 *gid = current->fsgid;
622 static int alloc_dinode(struct gfs2_inode *dip, struct gfs2_inum *inum)
624 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
629 dip->i_alloc.al_requested = RES_DINODE;
630 error = gfs2_inplace_reserve(dip);
634 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS, 0);
638 inum->no_addr = gfs2_alloc_di(dip);
643 gfs2_inplace_release(dip);
652 * init_dinode - Fill in a new dinode structure
653 * @dip: the directory this inode is being created in
654 * @gl: The glock covering the new inode
655 * @inum: the inode number
656 * @mode: the file permissions
662 static void init_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
663 struct gfs2_inum *inum, unsigned int mode,
664 unsigned int uid, unsigned int gid)
666 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
667 struct gfs2_dinode *di;
668 struct buffer_head *dibh;
670 dibh = gfs2_meta_new(gl, inum->no_addr);
671 gfs2_trans_add_bh(gl, dibh, 1);
672 gfs2_metatype_set(dibh, GFS2_METATYPE_DI, GFS2_FORMAT_DI);
673 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
674 di = (struct gfs2_dinode *)dibh->b_data;
676 di->di_num.no_formal_ino = cpu_to_be64(inum->no_formal_ino);
677 di->di_num.no_addr = cpu_to_be64(inum->no_addr);
678 di->di_mode = cpu_to_be32(mode);
679 di->di_uid = cpu_to_be32(uid);
680 di->di_gid = cpu_to_be32(gid);
681 di->di_nlink = cpu_to_be32(0);
682 di->di_size = cpu_to_be64(0);
683 di->di_blocks = cpu_to_be64(1);
684 di->di_atime = di->di_mtime = di->di_ctime = cpu_to_be64(get_seconds());
685 di->di_major = di->di_minor = cpu_to_be32(0);
686 di->di_goal_meta = di->di_goal_data = cpu_to_be64(inum->no_addr);
687 di->__pad[0] = di->__pad[1] = 0;
688 di->di_flags = cpu_to_be32(0);
691 if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_JDATA) ||
692 gfs2_tune_get(sdp, gt_new_files_jdata))
693 di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA);
694 if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_DIRECTIO) ||
695 gfs2_tune_get(sdp, gt_new_files_directio))
696 di->di_flags |= cpu_to_be32(GFS2_DIF_DIRECTIO);
697 } else if (S_ISDIR(mode)) {
698 di->di_flags |= cpu_to_be32(dip->i_di.di_flags &
699 GFS2_DIF_INHERIT_DIRECTIO);
700 di->di_flags |= cpu_to_be32(dip->i_di.di_flags &
701 GFS2_DIF_INHERIT_JDATA);
705 di->di_height = cpu_to_be32(0);
708 di->di_depth = cpu_to_be16(0);
709 di->di_entries = cpu_to_be32(0);
710 memset(&di->__pad4, 0, sizeof(di->__pad4));
711 di->di_eattr = cpu_to_be64(0);
712 memset(&di->di_reserved, 0, sizeof(di->di_reserved));
717 static int make_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
718 unsigned int mode, struct gfs2_inum *inum)
720 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
721 unsigned int uid, gid;
724 munge_mode_uid_gid(dip, &mode, &uid, &gid);
727 error = gfs2_quota_lock(dip, uid, gid);
731 error = gfs2_quota_check(dip, uid, gid);
735 error = gfs2_trans_begin(sdp, RES_DINODE + RES_QUOTA, 0);
739 init_dinode(dip, gl, inum, mode, uid, gid);
740 gfs2_quota_change(dip, +1, uid, gid);
744 gfs2_quota_unlock(dip);
750 static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
751 struct gfs2_inode *ip)
753 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
754 struct gfs2_alloc *al;
756 struct buffer_head *dibh;
759 al = gfs2_alloc_get(dip);
761 error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
765 error = alloc_required = gfs2_diradd_alloc_required(&dip->i_inode, name);
766 if (alloc_required < 0)
768 if (alloc_required) {
769 error = gfs2_quota_check(dip, dip->i_di.di_uid,
772 goto fail_quota_locks;
774 al->al_requested = sdp->sd_max_dirres;
776 error = gfs2_inplace_reserve(dip);
778 goto fail_quota_locks;
780 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
781 al->al_rgd->rd_ri.ri_length +
783 RES_STATFS + RES_QUOTA, 0);
787 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
789 goto fail_quota_locks;
792 error = gfs2_dir_add(&dip->i_inode, name, &ip->i_num, IF2DT(ip->i_di.di_mode));
796 error = gfs2_meta_inode_buffer(ip, &dibh);
799 ip->i_di.di_nlink = 1;
800 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
801 gfs2_dinode_out(&ip->i_di, dibh->b_data);
809 if (dip->i_alloc.al_rgd)
810 gfs2_inplace_release(dip);
813 gfs2_quota_unlock(dip);
821 * gfs2_createi - Create a new inode
822 * @ghs: An array of two holders
823 * @name: The name of the new file
824 * @mode: the permissions on the new inode
826 * @ghs[0] is an initialized holder for the directory
827 * @ghs[1] is the holder for the inode lock
829 * If the return value is not NULL, the glocks on both the directory and the new
830 * file are held. A transaction has been started and an inplace reservation
836 struct inode *gfs2_createi(struct gfs2_holder *ghs, const struct qstr *name,
840 struct gfs2_inode *dip = ghs->gh_gl->gl_object;
841 struct inode *dir = &dip->i_inode;
842 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
843 struct gfs2_inum inum;
846 if (!name->len || name->len > GFS2_FNAMESIZE)
847 return ERR_PTR(-ENAMETOOLONG);
849 gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs);
850 error = gfs2_glock_nq(ghs);
854 error = create_ok(dip, name, mode);
858 error = pick_formal_ino(sdp, &inum.no_formal_ino);
862 error = alloc_dinode(dip, &inum);
866 if (inum.no_addr < dip->i_num.no_addr) {
869 error = gfs2_glock_nq_num(sdp, inum.no_addr,
870 &gfs2_inode_glops, LM_ST_EXCLUSIVE,
873 return ERR_PTR(error);
876 gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs);
877 error = gfs2_glock_nq(ghs);
879 gfs2_glock_dq_uninit(ghs + 1);
880 return ERR_PTR(error);
883 error = create_ok(dip, name, mode);
887 error = gfs2_glock_nq_num(sdp, inum.no_addr,
888 &gfs2_inode_glops, LM_ST_EXCLUSIVE,
894 error = make_dinode(dip, ghs[1].gh_gl, mode, &inum);
898 inode = gfs2_inode_lookup(dir->i_sb, &inum, IF2DT(mode));
902 error = gfs2_inode_refresh(GFS2_I(inode));
906 error = gfs2_acl_create(dip, GFS2_I(inode));
910 error = link_dinode(dip, name, GFS2_I(inode));
915 return ERR_PTR(-ENOMEM);
921 gfs2_glock_dq_uninit(ghs + 1);
925 return ERR_PTR(error);
929 * gfs2_rmdiri - Remove a directory
930 * @dip: The parent directory of the directory to be removed
931 * @name: The name of the directory to be removed
932 * @ip: The GFS2 inode of the directory to be removed
934 * Assumes Glocks on dip and ip are held
939 int gfs2_rmdiri(struct gfs2_inode *dip, const struct qstr *name,
940 struct gfs2_inode *ip)
945 if (ip->i_di.di_entries != 2) {
946 if (gfs2_consist_inode(ip))
947 gfs2_dinode_print(&ip->i_di);
951 error = gfs2_dir_del(dip, name);
955 error = gfs2_change_nlink(dip, -1);
959 gfs2_str2qstr(&dotname, ".");
960 error = gfs2_dir_del(ip, &dotname);
964 gfs2_str2qstr(&dotname, "..");
965 error = gfs2_dir_del(ip, &dotname);
969 error = gfs2_change_nlink(ip, -2);
977 * gfs2_unlink_ok - check to see that a inode is still in a directory
978 * @dip: the directory
979 * @name: the name of the file
982 * Assumes that the lock on (at least) @dip is held.
984 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
987 int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
988 struct gfs2_inode *ip)
990 struct gfs2_inum inum;
994 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
997 if ((dip->i_di.di_mode & S_ISVTX) &&
998 dip->i_di.di_uid != current->fsuid &&
999 ip->i_di.di_uid != current->fsuid && !capable(CAP_FOWNER))
1002 if (IS_APPEND(&dip->i_inode))
1005 error = permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL);
1009 error = gfs2_dir_search(&dip->i_inode, name, &inum, &type);
1013 if (!gfs2_inum_equal(&inum, &ip->i_num))
1016 if (IF2DT(ip->i_di.di_mode) != type) {
1017 gfs2_consist_inode(dip);
1025 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1029 * Follow @to back to the root and make sure we don't encounter @this
1030 * Assumes we already hold the rename lock.
1035 int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1037 struct inode *dir = &to->i_inode;
1038 struct super_block *sb = dir->i_sb;
1043 gfs2_str2qstr(&dotdot, "..");
1048 if (dir == &this->i_inode) {
1052 if (dir == sb->s_root->d_inode) {
1057 tmp = gfs2_lookupi(dir, &dotdot, 1, NULL);
1059 error = PTR_ERR(tmp);
1073 * gfs2_readlinki - return the contents of a symlink
1074 * @ip: the symlink's inode
1075 * @buf: a pointer to the buffer to be filled
1076 * @len: a pointer to the length of @buf
1078 * If @buf is too small, a piece of memory is kmalloc()ed and needs
1079 * to be freed by the caller.
1084 int gfs2_readlinki(struct gfs2_inode *ip, char **buf, unsigned int *len)
1086 struct gfs2_holder i_gh;
1087 struct buffer_head *dibh;
1091 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &i_gh);
1092 error = gfs2_glock_nq_atime(&i_gh);
1094 gfs2_holder_uninit(&i_gh);
1098 if (!ip->i_di.di_size) {
1099 gfs2_consist_inode(ip);
1104 error = gfs2_meta_inode_buffer(ip, &dibh);
1108 x = ip->i_di.di_size + 1;
1110 *buf = kmalloc(x, GFP_KERNEL);
1117 memcpy(*buf, dibh->b_data + sizeof(struct gfs2_dinode), x);
1123 gfs2_glock_dq_uninit(&i_gh);
1128 * gfs2_glock_nq_atime - Acquire a hold on an inode's glock, and
1129 * conditionally update the inode's atime
1130 * @gh: the holder to acquire
1132 * Tests atime (access time) for gfs2_read, gfs2_readdir and gfs2_mmap
1133 * Update if the difference between the current time and the inode's current
1134 * atime is greater than an interval specified at mount.
1139 int gfs2_glock_nq_atime(struct gfs2_holder *gh)
1141 struct gfs2_glock *gl = gh->gh_gl;
1142 struct gfs2_sbd *sdp = gl->gl_sbd;
1143 struct gfs2_inode *ip = gl->gl_object;
1144 int64_t curtime, quantum = gfs2_tune_get(sdp, gt_atime_quantum);
1149 if (gfs2_assert_warn(sdp, gh->gh_flags & GL_ATIME) ||
1150 gfs2_assert_warn(sdp, !(gh->gh_flags & GL_ASYNC)) ||
1151 gfs2_assert_warn(sdp, gl->gl_ops == &gfs2_inode_glops))
1154 state = gh->gh_state;
1155 flags = gh->gh_flags;
1157 error = gfs2_glock_nq(gh);
1161 if (test_bit(SDF_NOATIME, &sdp->sd_flags) ||
1162 (sdp->sd_vfs->s_flags & MS_RDONLY))
1165 curtime = get_seconds();
1166 if (curtime - ip->i_di.di_atime >= quantum) {
1168 gfs2_holder_reinit(LM_ST_EXCLUSIVE, gh->gh_flags & ~LM_FLAG_ANY,
1170 error = gfs2_glock_nq(gh);
1174 /* Verify that atime hasn't been updated while we were
1175 trying to get exclusive lock. */
1177 curtime = get_seconds();
1178 if (curtime - ip->i_di.di_atime >= quantum) {
1179 struct buffer_head *dibh;
1181 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
1182 if (error == -EROFS)
1187 error = gfs2_meta_inode_buffer(ip, &dibh);
1189 goto fail_end_trans;
1191 ip->i_di.di_atime = curtime;
1193 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1194 gfs2_dinode_out(&ip->i_di, dibh->b_data);
1197 gfs2_trans_end(sdp);
1200 /* If someone else has asked for the glock,
1201 unlock and let them have it. Then reacquire
1202 in the original state. */
1203 if (gfs2_glock_is_blocking(gl)) {
1205 gfs2_holder_reinit(state, flags, gh);
1206 return gfs2_glock_nq(gh);
1213 gfs2_trans_end(sdp);
1220 * glock_compare_atime - Compare two struct gfs2_glock structures for sort
1221 * @arg_a: the first structure
1222 * @arg_b: the second structure
1224 * Returns: 1 if A > B
1229 static int glock_compare_atime(const void *arg_a, const void *arg_b)
1231 struct gfs2_holder *gh_a = *(struct gfs2_holder **)arg_a;
1232 struct gfs2_holder *gh_b = *(struct gfs2_holder **)arg_b;
1233 struct lm_lockname *a = &gh_a->gh_gl->gl_name;
1234 struct lm_lockname *b = &gh_b->gh_gl->gl_name;
1237 if (a->ln_number > b->ln_number)
1239 else if (a->ln_number < b->ln_number)
1242 if (gh_a->gh_state == LM_ST_SHARED &&
1243 gh_b->gh_state == LM_ST_EXCLUSIVE)
1245 else if (gh_a->gh_state == LM_ST_SHARED &&
1246 (gh_b->gh_flags & GL_ATIME))
1254 * gfs2_glock_nq_m_atime - acquire multiple glocks where one may need an
1256 * @num_gh: the number of structures
1257 * @ghs: an array of struct gfs2_holder structures
1259 * Returns: 0 on success (all glocks acquired),
1260 * errno on failure (no glocks acquired)
1263 int gfs2_glock_nq_m_atime(unsigned int num_gh, struct gfs2_holder *ghs)
1265 struct gfs2_holder **p;
1273 ghs->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC);
1274 if (ghs->gh_flags & GL_ATIME)
1275 error = gfs2_glock_nq_atime(ghs);
1277 error = gfs2_glock_nq(ghs);
1281 p = kcalloc(num_gh, sizeof(struct gfs2_holder *), GFP_KERNEL);
1285 for (x = 0; x < num_gh; x++)
1288 sort(p, num_gh, sizeof(struct gfs2_holder *), glock_compare_atime,NULL);
1290 for (x = 0; x < num_gh; x++) {
1291 p[x]->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC);
1293 if (p[x]->gh_flags & GL_ATIME)
1294 error = gfs2_glock_nq_atime(p[x]);
1296 error = gfs2_glock_nq(p[x]);
1300 gfs2_glock_dq(p[x]);
1312 __gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr)
1314 struct buffer_head *dibh;
1317 error = gfs2_meta_inode_buffer(ip, &dibh);
1319 error = inode_setattr(&ip->i_inode, attr);
1320 gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error);
1321 gfs2_inode_attr_out(ip);
1323 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1324 gfs2_dinode_out(&ip->i_di, dibh->b_data);
1331 * gfs2_setattr_simple -
1335 * Called with a reference on the vnode.
1340 int gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr)
1344 if (current->journal_info)
1345 return __gfs2_setattr_simple(ip, attr);
1347 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE, 0);
1351 error = __gfs2_setattr_simple(ip, attr);
1353 gfs2_trans_end(GFS2_SB(&ip->i_inode));