2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
5 * This copyrighted material is made available to anyone wishing to use,
6 * modify, copy, or redistribute it subject to the terms and conditions
7 * of the GNU General Public License version 2.
10 #include <linux/sched.h>
11 #include <linux/slab.h>
12 #include <linux/spinlock.h>
13 #include <linux/completion.h>
14 #include <linux/buffer_head.h>
15 #include <linux/posix_acl.h>
16 #include <linux/sort.h>
17 #include <linux/gfs2_ondisk.h>
18 #include <linux/crc32.h>
19 #include <linux/lm_interface.h>
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;
50 struct gfs2_dinode *di = &ip->i_di;
52 inode->i_ino = ip->i_num.no_addr;
54 switch (di->di_mode & S_IFMT) {
57 inode->i_rdev = MKDEV(di->di_major, di->di_minor);
64 inode->i_mode = di->di_mode;
65 inode->i_nlink = di->di_nlink;
66 inode->i_uid = di->di_uid;
67 inode->i_gid = di->di_gid;
68 i_size_write(inode, di->di_size);
69 inode->i_atime.tv_sec = di->di_atime;
70 inode->i_mtime.tv_sec = di->di_mtime;
71 inode->i_ctime.tv_sec = di->di_ctime;
72 inode->i_atime.tv_nsec = 0;
73 inode->i_mtime.tv_nsec = 0;
74 inode->i_ctime.tv_nsec = 0;
75 inode->i_blocks = di->di_blocks <<
76 (GFS2_SB(inode)->sd_sb.sb_bsize_shift - GFS2_BASIC_BLOCK_SHIFT);
78 if (di->di_flags & GFS2_DIF_IMMUTABLE)
79 inode->i_flags |= S_IMMUTABLE;
81 inode->i_flags &= ~S_IMMUTABLE;
83 if (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;
100 struct gfs2_dinode *di = &ip->i_di;
101 gfs2_assert_withdraw(GFS2_SB(inode),
102 (di->di_mode & S_IFMT) == (inode->i_mode & S_IFMT));
103 di->di_mode = inode->i_mode;
104 di->di_uid = inode->i_uid;
105 di->di_gid = inode->i_gid;
106 di->di_atime = inode->i_atime.tv_sec;
107 di->di_mtime = inode->i_mtime.tv_sec;
108 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->i_private = 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)
389 struct super_block *sb = dir->i_sb;
390 struct gfs2_inode *dip = GFS2_I(dir);
391 struct gfs2_holder d_gh;
392 struct gfs2_inum inum;
395 struct inode *inode = NULL;
397 if (!name->len || name->len > GFS2_FNAMESIZE)
398 return ERR_PTR(-ENAMETOOLONG);
400 if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) ||
401 (name->len == 2 && memcmp(name->name, "..", 2) == 0 &&
402 dir == sb->s_root->d_inode)) {
407 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
409 return ERR_PTR(error);
412 error = permission(dir, MAY_EXEC, NULL);
417 error = gfs2_dir_search(dir, name, &inum, &type);
421 inode = gfs2_inode_lookup(sb, &inum, type);
424 gfs2_glock_dq_uninit(&d_gh);
425 if (error == -ENOENT)
430 static int pick_formal_ino_1(struct gfs2_sbd *sdp, u64 *formal_ino)
432 struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode);
433 struct buffer_head *bh;
434 struct gfs2_inum_range ir;
437 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
440 mutex_lock(&sdp->sd_inum_mutex);
442 error = gfs2_meta_inode_buffer(ip, &bh);
444 mutex_unlock(&sdp->sd_inum_mutex);
449 gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode));
452 *formal_ino = ir.ir_start++;
454 gfs2_trans_add_bh(ip->i_gl, bh, 1);
455 gfs2_inum_range_out(&ir,
456 bh->b_data + sizeof(struct gfs2_dinode));
458 mutex_unlock(&sdp->sd_inum_mutex);
465 mutex_unlock(&sdp->sd_inum_mutex);
471 static int pick_formal_ino_2(struct gfs2_sbd *sdp, u64 *formal_ino)
473 struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode);
474 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_inum_inode);
475 struct gfs2_holder gh;
476 struct buffer_head *bh;
477 struct gfs2_inum_range ir;
480 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
484 error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0);
487 mutex_lock(&sdp->sd_inum_mutex);
489 error = gfs2_meta_inode_buffer(ip, &bh);
493 gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode));
496 struct buffer_head *m_bh;
499 error = gfs2_meta_inode_buffer(m_ip, &m_bh);
503 x = *(u64 *)(m_bh->b_data + sizeof(struct gfs2_dinode));
504 x = y = be64_to_cpu(x);
506 ir.ir_length = GFS2_INUM_QUANTUM;
507 x += GFS2_INUM_QUANTUM;
509 gfs2_consist_inode(m_ip);
511 gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1);
512 *(u64 *)(m_bh->b_data + sizeof(struct gfs2_dinode)) = x;
517 *formal_ino = ir.ir_start++;
520 gfs2_trans_add_bh(ip->i_gl, bh, 1);
521 gfs2_inum_range_out(&ir, bh->b_data + sizeof(struct gfs2_dinode));
526 mutex_unlock(&sdp->sd_inum_mutex);
529 gfs2_glock_dq_uninit(&gh);
533 static int pick_formal_ino(struct gfs2_sbd *sdp, u64 *inum)
537 error = pick_formal_ino_1(sdp, inum);
541 error = pick_formal_ino_2(sdp, inum);
547 * create_ok - OK to create a new on-disk inode here?
548 * @dip: Directory in which dinode is to be created
549 * @name: Name of new dinode
555 static int create_ok(struct gfs2_inode *dip, const struct qstr *name,
560 error = permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL);
564 /* Don't create entries in an unlinked directory */
565 if (!dip->i_di.di_nlink)
568 error = gfs2_dir_search(&dip->i_inode, name, NULL, NULL);
579 if (dip->i_di.di_entries == (u32)-1)
581 if (S_ISDIR(mode) && dip->i_di.di_nlink == (u32)-1)
587 static void munge_mode_uid_gid(struct gfs2_inode *dip, unsigned int *mode,
588 unsigned int *uid, unsigned int *gid)
590 if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir &&
591 (dip->i_di.di_mode & S_ISUID) && dip->i_di.di_uid) {
594 else if (dip->i_di.di_uid != current->fsuid)
596 *uid = dip->i_di.di_uid;
598 *uid = current->fsuid;
600 if (dip->i_di.di_mode & S_ISGID) {
603 *gid = dip->i_di.di_gid;
605 *gid = current->fsgid;
608 static int alloc_dinode(struct gfs2_inode *dip, struct gfs2_inum *inum,
611 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
616 dip->i_alloc.al_requested = RES_DINODE;
617 error = gfs2_inplace_reserve(dip);
621 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS, 0);
625 inum->no_addr = gfs2_alloc_di(dip, generation);
630 gfs2_inplace_release(dip);
637 * init_dinode - Fill in a new dinode structure
638 * @dip: the directory this inode is being created in
639 * @gl: The glock covering the new inode
640 * @inum: the inode number
641 * @mode: the file permissions
647 static void init_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
648 const struct gfs2_inum *inum, unsigned int mode,
649 unsigned int uid, unsigned int gid,
650 const u64 *generation)
652 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
653 struct gfs2_dinode *di;
654 struct buffer_head *dibh;
656 dibh = gfs2_meta_new(gl, inum->no_addr);
657 gfs2_trans_add_bh(gl, dibh, 1);
658 gfs2_metatype_set(dibh, GFS2_METATYPE_DI, GFS2_FORMAT_DI);
659 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
660 di = (struct gfs2_dinode *)dibh->b_data;
662 di->di_num.no_formal_ino = cpu_to_be64(inum->no_formal_ino);
663 di->di_num.no_addr = cpu_to_be64(inum->no_addr);
664 di->di_mode = cpu_to_be32(mode);
665 di->di_uid = cpu_to_be32(uid);
666 di->di_gid = cpu_to_be32(gid);
667 di->di_nlink = cpu_to_be32(0);
668 di->di_size = cpu_to_be64(0);
669 di->di_blocks = cpu_to_be64(1);
670 di->di_atime = di->di_mtime = di->di_ctime = cpu_to_be64(get_seconds());
671 di->di_major = di->di_minor = cpu_to_be32(0);
672 di->di_goal_meta = di->di_goal_data = cpu_to_be64(inum->no_addr);
673 di->di_generation = cpu_to_be64(*generation);
674 di->di_flags = cpu_to_be32(0);
677 if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_JDATA) ||
678 gfs2_tune_get(sdp, gt_new_files_jdata))
679 di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA);
680 if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_DIRECTIO) ||
681 gfs2_tune_get(sdp, gt_new_files_directio))
682 di->di_flags |= cpu_to_be32(GFS2_DIF_DIRECTIO);
683 } else if (S_ISDIR(mode)) {
684 di->di_flags |= cpu_to_be32(dip->i_di.di_flags &
685 GFS2_DIF_INHERIT_DIRECTIO);
686 di->di_flags |= cpu_to_be32(dip->i_di.di_flags &
687 GFS2_DIF_INHERIT_JDATA);
691 di->di_payload_format = cpu_to_be32(0);
692 di->di_height = cpu_to_be32(0);
695 di->di_depth = cpu_to_be16(0);
696 di->di_entries = cpu_to_be32(0);
697 memset(&di->__pad4, 0, sizeof(di->__pad4));
698 di->di_eattr = cpu_to_be64(0);
699 memset(&di->di_reserved, 0, sizeof(di->di_reserved));
704 static int make_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
705 unsigned int mode, const struct gfs2_inum *inum,
706 const u64 *generation)
708 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
709 unsigned int uid, gid;
712 munge_mode_uid_gid(dip, &mode, &uid, &gid);
715 error = gfs2_quota_lock(dip, uid, gid);
719 error = gfs2_quota_check(dip, uid, gid);
723 error = gfs2_trans_begin(sdp, RES_DINODE + RES_QUOTA, 0);
727 init_dinode(dip, gl, inum, mode, uid, gid, generation);
728 gfs2_quota_change(dip, +1, uid, gid);
732 gfs2_quota_unlock(dip);
738 static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
739 struct gfs2_inode *ip)
741 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
742 struct gfs2_alloc *al;
744 struct buffer_head *dibh;
747 al = gfs2_alloc_get(dip);
749 error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
753 error = alloc_required = gfs2_diradd_alloc_required(&dip->i_inode, name);
754 if (alloc_required < 0)
756 if (alloc_required) {
757 error = gfs2_quota_check(dip, dip->i_di.di_uid,
760 goto fail_quota_locks;
762 al->al_requested = sdp->sd_max_dirres;
764 error = gfs2_inplace_reserve(dip);
766 goto fail_quota_locks;
768 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
769 al->al_rgd->rd_ri.ri_length +
771 RES_STATFS + RES_QUOTA, 0);
775 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
777 goto fail_quota_locks;
780 error = gfs2_dir_add(&dip->i_inode, name, &ip->i_num, IF2DT(ip->i_di.di_mode));
784 error = gfs2_meta_inode_buffer(ip, &dibh);
787 ip->i_di.di_nlink = 1;
788 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
789 gfs2_dinode_out(&ip->i_di, dibh->b_data);
797 if (dip->i_alloc.al_rgd)
798 gfs2_inplace_release(dip);
801 gfs2_quota_unlock(dip);
809 * gfs2_createi - Create a new inode
810 * @ghs: An array of two holders
811 * @name: The name of the new file
812 * @mode: the permissions on the new inode
814 * @ghs[0] is an initialized holder for the directory
815 * @ghs[1] is the holder for the inode lock
817 * If the return value is not NULL, the glocks on both the directory and the new
818 * file are held. A transaction has been started and an inplace reservation
824 struct inode *gfs2_createi(struct gfs2_holder *ghs, const struct qstr *name,
828 struct gfs2_inode *dip = ghs->gh_gl->gl_object;
829 struct inode *dir = &dip->i_inode;
830 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
831 struct gfs2_inum inum;
835 if (!name->len || name->len > GFS2_FNAMESIZE)
836 return ERR_PTR(-ENAMETOOLONG);
838 gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs);
839 error = gfs2_glock_nq(ghs);
843 error = create_ok(dip, name, mode);
847 error = pick_formal_ino(sdp, &inum.no_formal_ino);
851 error = alloc_dinode(dip, &inum, &generation);
855 if (inum.no_addr < dip->i_num.no_addr) {
858 error = gfs2_glock_nq_num(sdp, inum.no_addr,
859 &gfs2_inode_glops, LM_ST_EXCLUSIVE,
862 return ERR_PTR(error);
865 gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs);
866 error = gfs2_glock_nq(ghs);
868 gfs2_glock_dq_uninit(ghs + 1);
869 return ERR_PTR(error);
872 error = create_ok(dip, name, mode);
876 error = gfs2_glock_nq_num(sdp, inum.no_addr,
877 &gfs2_inode_glops, LM_ST_EXCLUSIVE,
883 error = make_dinode(dip, ghs[1].gh_gl, mode, &inum, &generation);
887 inode = gfs2_inode_lookup(dir->i_sb, &inum, IF2DT(mode));
891 error = gfs2_inode_refresh(GFS2_I(inode));
895 error = gfs2_acl_create(dip, GFS2_I(inode));
899 error = link_dinode(dip, name, GFS2_I(inode));
904 return ERR_PTR(-ENOMEM);
910 gfs2_glock_dq_uninit(ghs + 1);
914 return ERR_PTR(error);
918 * gfs2_rmdiri - Remove a directory
919 * @dip: The parent directory of the directory to be removed
920 * @name: The name of the directory to be removed
921 * @ip: The GFS2 inode of the directory to be removed
923 * Assumes Glocks on dip and ip are held
928 int gfs2_rmdiri(struct gfs2_inode *dip, const struct qstr *name,
929 struct gfs2_inode *ip)
934 if (ip->i_di.di_entries != 2) {
935 if (gfs2_consist_inode(ip))
936 gfs2_dinode_print(&ip->i_di);
940 error = gfs2_dir_del(dip, name);
944 error = gfs2_change_nlink(dip, -1);
948 gfs2_str2qstr(&dotname, ".");
949 error = gfs2_dir_del(ip, &dotname);
953 gfs2_str2qstr(&dotname, "..");
954 error = gfs2_dir_del(ip, &dotname);
958 error = gfs2_change_nlink(ip, -2);
966 * gfs2_unlink_ok - check to see that a inode is still in a directory
967 * @dip: the directory
968 * @name: the name of the file
971 * Assumes that the lock on (at least) @dip is held.
973 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
976 int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
977 struct gfs2_inode *ip)
979 struct gfs2_inum inum;
983 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
986 if ((dip->i_di.di_mode & S_ISVTX) &&
987 dip->i_di.di_uid != current->fsuid &&
988 ip->i_di.di_uid != current->fsuid && !capable(CAP_FOWNER))
991 if (IS_APPEND(&dip->i_inode))
994 error = permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL);
998 error = gfs2_dir_search(&dip->i_inode, name, &inum, &type);
1002 if (!gfs2_inum_equal(&inum, &ip->i_num))
1005 if (IF2DT(ip->i_di.di_mode) != type) {
1006 gfs2_consist_inode(dip);
1014 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1018 * Follow @to back to the root and make sure we don't encounter @this
1019 * Assumes we already hold the rename lock.
1024 int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1026 struct inode *dir = &to->i_inode;
1027 struct super_block *sb = dir->i_sb;
1032 gfs2_str2qstr(&dotdot, "..");
1037 if (dir == &this->i_inode) {
1041 if (dir == sb->s_root->d_inode) {
1046 tmp = gfs2_lookupi(dir, &dotdot, 1, NULL);
1048 error = PTR_ERR(tmp);
1062 * gfs2_readlinki - return the contents of a symlink
1063 * @ip: the symlink's inode
1064 * @buf: a pointer to the buffer to be filled
1065 * @len: a pointer to the length of @buf
1067 * If @buf is too small, a piece of memory is kmalloc()ed and needs
1068 * to be freed by the caller.
1073 int gfs2_readlinki(struct gfs2_inode *ip, char **buf, unsigned int *len)
1075 struct gfs2_holder i_gh;
1076 struct buffer_head *dibh;
1080 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &i_gh);
1081 error = gfs2_glock_nq_atime(&i_gh);
1083 gfs2_holder_uninit(&i_gh);
1087 if (!ip->i_di.di_size) {
1088 gfs2_consist_inode(ip);
1093 error = gfs2_meta_inode_buffer(ip, &dibh);
1097 x = ip->i_di.di_size + 1;
1099 *buf = kmalloc(x, GFP_KERNEL);
1106 memcpy(*buf, dibh->b_data + sizeof(struct gfs2_dinode), x);
1112 gfs2_glock_dq_uninit(&i_gh);
1117 * gfs2_glock_nq_atime - Acquire a hold on an inode's glock, and
1118 * conditionally update the inode's atime
1119 * @gh: the holder to acquire
1121 * Tests atime (access time) for gfs2_read, gfs2_readdir and gfs2_mmap
1122 * Update if the difference between the current time and the inode's current
1123 * atime is greater than an interval specified at mount.
1128 int gfs2_glock_nq_atime(struct gfs2_holder *gh)
1130 struct gfs2_glock *gl = gh->gh_gl;
1131 struct gfs2_sbd *sdp = gl->gl_sbd;
1132 struct gfs2_inode *ip = gl->gl_object;
1133 s64 curtime, quantum = gfs2_tune_get(sdp, gt_atime_quantum);
1138 if (gfs2_assert_warn(sdp, gh->gh_flags & GL_ATIME) ||
1139 gfs2_assert_warn(sdp, !(gh->gh_flags & GL_ASYNC)) ||
1140 gfs2_assert_warn(sdp, gl->gl_ops == &gfs2_inode_glops))
1143 state = gh->gh_state;
1144 flags = gh->gh_flags;
1146 error = gfs2_glock_nq(gh);
1150 if (test_bit(SDF_NOATIME, &sdp->sd_flags) ||
1151 (sdp->sd_vfs->s_flags & MS_RDONLY))
1154 curtime = get_seconds();
1155 if (curtime - ip->i_di.di_atime >= quantum) {
1157 gfs2_holder_reinit(LM_ST_EXCLUSIVE, gh->gh_flags & ~LM_FLAG_ANY,
1159 error = gfs2_glock_nq(gh);
1163 /* Verify that atime hasn't been updated while we were
1164 trying to get exclusive lock. */
1166 curtime = get_seconds();
1167 if (curtime - ip->i_di.di_atime >= quantum) {
1168 struct buffer_head *dibh;
1170 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
1171 if (error == -EROFS)
1176 error = gfs2_meta_inode_buffer(ip, &dibh);
1178 goto fail_end_trans;
1180 ip->i_di.di_atime = curtime;
1182 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1183 gfs2_dinode_out(&ip->i_di, dibh->b_data);
1186 gfs2_trans_end(sdp);
1189 /* If someone else has asked for the glock,
1190 unlock and let them have it. Then reacquire
1191 in the original state. */
1192 if (gfs2_glock_is_blocking(gl)) {
1194 gfs2_holder_reinit(state, flags, gh);
1195 return gfs2_glock_nq(gh);
1202 gfs2_trans_end(sdp);
1209 * glock_compare_atime - Compare two struct gfs2_glock structures for sort
1210 * @arg_a: the first structure
1211 * @arg_b: the second structure
1213 * Returns: 1 if A > B
1218 static int glock_compare_atime(const void *arg_a, const void *arg_b)
1220 const struct gfs2_holder *gh_a = *(const struct gfs2_holder **)arg_a;
1221 const struct gfs2_holder *gh_b = *(const struct gfs2_holder **)arg_b;
1222 const struct lm_lockname *a = &gh_a->gh_gl->gl_name;
1223 const struct lm_lockname *b = &gh_b->gh_gl->gl_name;
1225 if (a->ln_number > b->ln_number)
1227 if (a->ln_number < b->ln_number)
1229 if (gh_a->gh_state == LM_ST_SHARED && gh_b->gh_state == LM_ST_EXCLUSIVE)
1231 if (gh_a->gh_state == LM_ST_SHARED && (gh_b->gh_flags & GL_ATIME))
1238 * gfs2_glock_nq_m_atime - acquire multiple glocks where one may need an
1240 * @num_gh: the number of structures
1241 * @ghs: an array of struct gfs2_holder structures
1243 * Returns: 0 on success (all glocks acquired),
1244 * errno on failure (no glocks acquired)
1247 int gfs2_glock_nq_m_atime(unsigned int num_gh, struct gfs2_holder *ghs)
1249 struct gfs2_holder **p;
1257 ghs->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC);
1258 if (ghs->gh_flags & GL_ATIME)
1259 error = gfs2_glock_nq_atime(ghs);
1261 error = gfs2_glock_nq(ghs);
1265 p = kcalloc(num_gh, sizeof(struct gfs2_holder *), GFP_KERNEL);
1269 for (x = 0; x < num_gh; x++)
1272 sort(p, num_gh, sizeof(struct gfs2_holder *), glock_compare_atime,NULL);
1274 for (x = 0; x < num_gh; x++) {
1275 p[x]->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC);
1277 if (p[x]->gh_flags & GL_ATIME)
1278 error = gfs2_glock_nq_atime(p[x]);
1280 error = gfs2_glock_nq(p[x]);
1284 gfs2_glock_dq(p[x]);
1295 __gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr)
1297 struct buffer_head *dibh;
1300 error = gfs2_meta_inode_buffer(ip, &dibh);
1302 error = inode_setattr(&ip->i_inode, attr);
1303 gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error);
1304 gfs2_inode_attr_out(ip);
1306 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1307 gfs2_dinode_out(&ip->i_di, dibh->b_data);
1314 * gfs2_setattr_simple -
1318 * Called with a reference on the vnode.
1323 int gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr)
1327 if (current->journal_info)
1328 return __gfs2_setattr_simple(ip, attr);
1330 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE, 0);
1334 error = __gfs2_setattr_simple(ip, attr);
1335 gfs2_trans_end(GFS2_SB(&ip->i_inode));