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>
20 #include <linux/security.h>
33 #include "ops_address.h"
35 #include "ops_inode.h"
41 struct gfs2_inum_range_host {
46 static int iget_test(struct inode *inode, void *opaque)
48 struct gfs2_inode *ip = GFS2_I(inode);
49 u64 *no_addr = opaque;
51 if (ip->i_no_addr == *no_addr &&
52 inode->i_private != NULL)
58 static int iget_set(struct inode *inode, void *opaque)
60 struct gfs2_inode *ip = GFS2_I(inode);
61 u64 *no_addr = opaque;
63 inode->i_ino = (unsigned long)*no_addr;
64 ip->i_no_addr = *no_addr;
68 struct inode *gfs2_ilookup(struct super_block *sb, u64 no_addr)
70 unsigned long hash = (unsigned long)no_addr;
71 return ilookup5(sb, hash, iget_test, &no_addr);
74 static struct inode *gfs2_iget(struct super_block *sb, u64 no_addr)
76 unsigned long hash = (unsigned long)no_addr;
77 return iget5_locked(sb, hash, iget_test, iget_set, &no_addr);
81 * gfs2_inode_lookup - Lookup an inode
82 * @sb: The super block
83 * @no_addr: The inode number
84 * @type: The type of the inode
86 * Returns: A VFS inode, or an error
89 struct inode *gfs2_inode_lookup(struct super_block *sb, u64 no_addr, unsigned int type)
91 struct inode *inode = gfs2_iget(sb, no_addr);
92 struct gfs2_inode *ip = GFS2_I(inode);
93 struct gfs2_glock *io_gl;
97 return ERR_PTR(-ENOBUFS);
99 if (inode->i_state & I_NEW) {
100 struct gfs2_sbd *sdp = GFS2_SB(inode);
101 umode_t mode = DT2IF(type);
102 inode->i_private = ip;
103 inode->i_mode = mode;
106 inode->i_op = &gfs2_file_iops;
107 inode->i_fop = &gfs2_file_fops;
108 inode->i_mapping->a_ops = &gfs2_file_aops;
109 } else if (S_ISDIR(mode)) {
110 inode->i_op = &gfs2_dir_iops;
111 inode->i_fop = &gfs2_dir_fops;
112 } else if (S_ISLNK(mode)) {
113 inode->i_op = &gfs2_symlink_iops;
115 inode->i_op = &gfs2_dev_iops;
118 error = gfs2_glock_get(sdp, no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
121 ip->i_gl->gl_object = ip;
123 error = gfs2_glock_get(sdp, no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
127 set_bit(GIF_INVALID, &ip->i_flags);
128 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
132 gfs2_glock_put(io_gl);
133 unlock_new_inode(inode);
138 gfs2_glock_put(io_gl);
140 ip->i_gl->gl_object = NULL;
141 gfs2_glock_put(ip->i_gl);
144 return ERR_PTR(error);
147 static int gfs2_dinode_in(struct gfs2_inode *ip, const void *buf)
149 struct gfs2_dinode_host *di = &ip->i_di;
150 const struct gfs2_dinode *str = buf;
152 if (ip->i_no_addr != be64_to_cpu(str->di_num.no_addr)) {
153 if (gfs2_consist_inode(ip))
154 gfs2_dinode_print(ip);
157 ip->i_no_formal_ino = be64_to_cpu(str->di_num.no_formal_ino);
158 ip->i_inode.i_mode = be32_to_cpu(str->di_mode);
159 ip->i_inode.i_rdev = 0;
160 switch (ip->i_inode.i_mode & S_IFMT) {
163 ip->i_inode.i_rdev = MKDEV(be32_to_cpu(str->di_major),
164 be32_to_cpu(str->di_minor));
168 ip->i_inode.i_uid = be32_to_cpu(str->di_uid);
169 ip->i_inode.i_gid = be32_to_cpu(str->di_gid);
171 * We will need to review setting the nlink count here in the
172 * light of the forthcoming ro bind mount work. This is a reminder
175 ip->i_inode.i_nlink = be32_to_cpu(str->di_nlink);
176 di->di_size = be64_to_cpu(str->di_size);
177 i_size_write(&ip->i_inode, di->di_size);
178 di->di_blocks = be64_to_cpu(str->di_blocks);
179 gfs2_set_inode_blocks(&ip->i_inode);
180 ip->i_inode.i_atime.tv_sec = be64_to_cpu(str->di_atime);
181 ip->i_inode.i_atime.tv_nsec = 0;
182 ip->i_inode.i_mtime.tv_sec = be64_to_cpu(str->di_mtime);
183 ip->i_inode.i_mtime.tv_nsec = 0;
184 ip->i_inode.i_ctime.tv_sec = be64_to_cpu(str->di_ctime);
185 ip->i_inode.i_ctime.tv_nsec = 0;
187 di->di_goal_meta = be64_to_cpu(str->di_goal_meta);
188 di->di_goal_data = be64_to_cpu(str->di_goal_data);
189 di->di_generation = be64_to_cpu(str->di_generation);
191 di->di_flags = be32_to_cpu(str->di_flags);
192 gfs2_set_inode_flags(&ip->i_inode);
193 di->di_height = be16_to_cpu(str->di_height);
195 di->di_depth = be16_to_cpu(str->di_depth);
196 di->di_entries = be32_to_cpu(str->di_entries);
198 di->di_eattr = be64_to_cpu(str->di_eattr);
203 * gfs2_inode_refresh - Refresh the incore copy of the dinode
204 * @ip: The GFS2 inode
209 int gfs2_inode_refresh(struct gfs2_inode *ip)
211 struct buffer_head *dibh;
214 error = gfs2_meta_inode_buffer(ip, &dibh);
218 if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), dibh, GFS2_METATYPE_DI)) {
223 error = gfs2_dinode_in(ip, dibh->b_data);
225 clear_bit(GIF_INVALID, &ip->i_flags);
230 int gfs2_dinode_dealloc(struct gfs2_inode *ip)
232 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
233 struct gfs2_alloc *al;
234 struct gfs2_rgrpd *rgd;
237 if (ip->i_di.di_blocks != 1) {
238 if (gfs2_consist_inode(ip))
239 gfs2_dinode_print(ip);
243 al = gfs2_alloc_get(ip);
245 error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
249 error = gfs2_rindex_hold(sdp, &al->al_ri_gh);
253 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr);
255 gfs2_consist_inode(ip);
257 goto out_rindex_relse;
260 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0,
263 goto out_rindex_relse;
265 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA, 1);
269 gfs2_trans_add_gl(ip->i_gl);
271 gfs2_free_di(rgd, ip);
274 clear_bit(GLF_STICKY, &ip->i_gl->gl_flags);
277 gfs2_glock_dq_uninit(&al->al_rgd_gh);
279 gfs2_glock_dq_uninit(&al->al_ri_gh);
281 gfs2_quota_unhold(ip);
288 * gfs2_change_nlink - Change nlink count on inode
289 * @ip: The GFS2 inode
290 * @diff: The change in the nlink count required
294 int gfs2_change_nlink(struct gfs2_inode *ip, int diff)
296 struct buffer_head *dibh;
300 BUG_ON(diff != 1 && diff != -1);
301 nlink = ip->i_inode.i_nlink + diff;
303 /* If we are reducing the nlink count, but the new value ends up being
304 bigger than the old one, we must have underflowed. */
305 if (diff < 0 && nlink > ip->i_inode.i_nlink) {
306 if (gfs2_consist_inode(ip))
307 gfs2_dinode_print(ip);
311 error = gfs2_meta_inode_buffer(ip, &dibh);
316 inc_nlink(&ip->i_inode);
318 drop_nlink(&ip->i_inode);
320 ip->i_inode.i_ctime = CURRENT_TIME_SEC;
322 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
323 gfs2_dinode_out(ip, dibh->b_data);
325 mark_inode_dirty(&ip->i_inode);
327 if (ip->i_inode.i_nlink == 0)
328 gfs2_unlink_di(&ip->i_inode); /* mark inode unlinked */
333 struct inode *gfs2_lookup_simple(struct inode *dip, const char *name)
337 gfs2_str2qstr(&qstr, name);
338 inode = gfs2_lookupi(dip, &qstr, 1, NULL);
339 /* gfs2_lookupi has inconsistent callers: vfs
340 * related routines expect NULL for no entry found,
341 * gfs2_lookup_simple callers expect ENOENT
342 * and do not check for NULL.
345 return ERR_PTR(-ENOENT);
352 * gfs2_lookupi - Look up a filename in a directory and return its inode
353 * @d_gh: An initialized holder for the directory glock
354 * @name: The name of the inode to look for
355 * @is_root: If 1, ignore the caller's permissions
356 * @i_gh: An uninitialized holder for the new inode glock
358 * This can be called via the VFS filldir function when NFS is doing
359 * a readdirplus and the inode which its intending to stat isn't
360 * already in cache. In this case we must not take the directory glock
361 * again, since the readdir call will have already taken that lock.
366 struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
367 int is_root, struct nameidata *nd)
369 struct super_block *sb = dir->i_sb;
370 struct gfs2_inode *dip = GFS2_I(dir);
371 struct gfs2_holder d_gh;
373 struct inode *inode = NULL;
376 if (!name->len || name->len > GFS2_FNAMESIZE)
377 return ERR_PTR(-ENAMETOOLONG);
379 if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) ||
380 (name->len == 2 && memcmp(name->name, "..", 2) == 0 &&
381 dir == sb->s_root->d_inode)) {
386 if (gfs2_glock_is_locked_by_me(dip->i_gl) == 0) {
387 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
389 return ERR_PTR(error);
394 error = permission(dir, MAY_EXEC, NULL);
399 inode = gfs2_dir_search(dir, name);
401 error = PTR_ERR(inode);
404 gfs2_glock_dq_uninit(&d_gh);
405 if (error == -ENOENT)
407 return inode ? inode : ERR_PTR(error);
410 static void gfs2_inum_range_in(struct gfs2_inum_range_host *ir, const void *buf)
412 const struct gfs2_inum_range *str = buf;
414 ir->ir_start = be64_to_cpu(str->ir_start);
415 ir->ir_length = be64_to_cpu(str->ir_length);
418 static void gfs2_inum_range_out(const struct gfs2_inum_range_host *ir, void *buf)
420 struct gfs2_inum_range *str = buf;
422 str->ir_start = cpu_to_be64(ir->ir_start);
423 str->ir_length = cpu_to_be64(ir->ir_length);
426 static int pick_formal_ino_1(struct gfs2_sbd *sdp, u64 *formal_ino)
428 struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode);
429 struct buffer_head *bh;
430 struct gfs2_inum_range_host ir;
433 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
436 mutex_lock(&sdp->sd_inum_mutex);
438 error = gfs2_meta_inode_buffer(ip, &bh);
440 mutex_unlock(&sdp->sd_inum_mutex);
445 gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode));
448 *formal_ino = ir.ir_start++;
450 gfs2_trans_add_bh(ip->i_gl, bh, 1);
451 gfs2_inum_range_out(&ir,
452 bh->b_data + sizeof(struct gfs2_dinode));
454 mutex_unlock(&sdp->sd_inum_mutex);
461 mutex_unlock(&sdp->sd_inum_mutex);
467 static int pick_formal_ino_2(struct gfs2_sbd *sdp, u64 *formal_ino)
469 struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode);
470 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_inum_inode);
471 struct gfs2_holder gh;
472 struct buffer_head *bh;
473 struct gfs2_inum_range_host ir;
476 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
480 error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0);
483 mutex_lock(&sdp->sd_inum_mutex);
485 error = gfs2_meta_inode_buffer(ip, &bh);
489 gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode));
492 struct buffer_head *m_bh;
496 error = gfs2_meta_inode_buffer(m_ip, &m_bh);
500 z = *(__be64 *)(m_bh->b_data + sizeof(struct gfs2_dinode));
501 x = y = be64_to_cpu(z);
503 ir.ir_length = GFS2_INUM_QUANTUM;
504 x += GFS2_INUM_QUANTUM;
506 gfs2_consist_inode(m_ip);
508 gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1);
509 *(__be64 *)(m_bh->b_data + sizeof(struct gfs2_dinode)) = z;
514 *formal_ino = ir.ir_start++;
517 gfs2_trans_add_bh(ip->i_gl, bh, 1);
518 gfs2_inum_range_out(&ir, bh->b_data + sizeof(struct gfs2_dinode));
523 mutex_unlock(&sdp->sd_inum_mutex);
526 gfs2_glock_dq_uninit(&gh);
530 static int pick_formal_ino(struct gfs2_sbd *sdp, u64 *inum)
534 error = pick_formal_ino_1(sdp, inum);
538 error = pick_formal_ino_2(sdp, inum);
544 * create_ok - OK to create a new on-disk inode here?
545 * @dip: Directory in which dinode is to be created
546 * @name: Name of new dinode
552 static int create_ok(struct gfs2_inode *dip, const struct qstr *name,
557 error = permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL);
561 /* Don't create entries in an unlinked directory */
562 if (!dip->i_inode.i_nlink)
565 error = gfs2_dir_check(&dip->i_inode, name, NULL);
576 if (dip->i_di.di_entries == (u32)-1)
578 if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1)
584 static void munge_mode_uid_gid(struct gfs2_inode *dip, unsigned int *mode,
585 unsigned int *uid, unsigned int *gid)
587 if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir &&
588 (dip->i_inode.i_mode & S_ISUID) && dip->i_inode.i_uid) {
591 else if (dip->i_inode.i_uid != current->fsuid)
593 *uid = dip->i_inode.i_uid;
595 *uid = current->fsuid;
597 if (dip->i_inode.i_mode & S_ISGID) {
600 *gid = dip->i_inode.i_gid;
602 *gid = current->fsgid;
605 static int alloc_dinode(struct gfs2_inode *dip, u64 *no_addr, u64 *generation)
607 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
612 dip->i_alloc.al_requested = RES_DINODE;
613 error = gfs2_inplace_reserve(dip);
617 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS, 0);
621 *no_addr = gfs2_alloc_di(dip, generation);
626 gfs2_inplace_release(dip);
633 * init_dinode - Fill in a new dinode structure
634 * @dip: the directory this inode is being created in
635 * @gl: The glock covering the new inode
636 * @inum: the inode number
637 * @mode: the file permissions
643 static void init_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
644 const struct gfs2_inum_host *inum, unsigned int mode,
645 unsigned int uid, unsigned int gid,
646 const u64 *generation, dev_t dev)
648 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
649 struct gfs2_dinode *di;
650 struct buffer_head *dibh;
652 dibh = gfs2_meta_new(gl, inum->no_addr);
653 gfs2_trans_add_bh(gl, dibh, 1);
654 gfs2_metatype_set(dibh, GFS2_METATYPE_DI, GFS2_FORMAT_DI);
655 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
656 di = (struct gfs2_dinode *)dibh->b_data;
658 di->di_num.no_formal_ino = cpu_to_be64(inum->no_formal_ino);
659 di->di_num.no_addr = cpu_to_be64(inum->no_addr);
660 di->di_mode = cpu_to_be32(mode);
661 di->di_uid = cpu_to_be32(uid);
662 di->di_gid = cpu_to_be32(gid);
665 di->di_blocks = cpu_to_be64(1);
666 di->di_atime = di->di_mtime = di->di_ctime = cpu_to_be64(get_seconds());
667 di->di_major = cpu_to_be32(MAJOR(dev));
668 di->di_minor = cpu_to_be32(MINOR(dev));
669 di->di_goal_meta = di->di_goal_data = cpu_to_be64(inum->no_addr);
670 di->di_generation = cpu_to_be64(*generation);
674 if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_JDATA) ||
675 gfs2_tune_get(sdp, gt_new_files_jdata))
676 di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA);
677 if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_DIRECTIO) ||
678 gfs2_tune_get(sdp, gt_new_files_directio))
679 di->di_flags |= cpu_to_be32(GFS2_DIF_DIRECTIO);
680 } else if (S_ISDIR(mode)) {
681 di->di_flags |= cpu_to_be32(dip->i_di.di_flags &
682 GFS2_DIF_INHERIT_DIRECTIO);
683 di->di_flags |= cpu_to_be32(dip->i_di.di_flags &
684 GFS2_DIF_INHERIT_JDATA);
688 di->di_payload_format = cpu_to_be32(S_ISDIR(mode) ? GFS2_FORMAT_DE : 0);
694 memset(&di->__pad4, 0, sizeof(di->__pad4));
696 memset(&di->di_reserved, 0, sizeof(di->di_reserved));
701 static int make_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
702 unsigned int mode, const struct gfs2_inum_host *inum,
703 const u64 *generation, dev_t dev)
705 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
706 unsigned int uid, gid;
709 munge_mode_uid_gid(dip, &mode, &uid, &gid);
712 error = gfs2_quota_lock(dip, uid, gid);
716 error = gfs2_quota_check(dip, uid, gid);
720 error = gfs2_trans_begin(sdp, RES_DINODE + RES_QUOTA, 0);
724 init_dinode(dip, gl, inum, mode, uid, gid, generation, dev);
725 gfs2_quota_change(dip, +1, uid, gid);
729 gfs2_quota_unlock(dip);
735 static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
736 struct gfs2_inode *ip)
738 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
739 struct gfs2_alloc *al;
741 struct buffer_head *dibh;
744 al = gfs2_alloc_get(dip);
746 error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
750 error = alloc_required = gfs2_diradd_alloc_required(&dip->i_inode, name);
751 if (alloc_required < 0)
753 if (alloc_required) {
754 error = gfs2_quota_check(dip, dip->i_inode.i_uid, dip->i_inode.i_gid);
756 goto fail_quota_locks;
758 al->al_requested = sdp->sd_max_dirres;
760 error = gfs2_inplace_reserve(dip);
762 goto fail_quota_locks;
764 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
765 al->al_rgd->rd_length +
767 RES_STATFS + RES_QUOTA, 0);
771 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
773 goto fail_quota_locks;
776 error = gfs2_dir_add(&dip->i_inode, name, ip, IF2DT(ip->i_inode.i_mode));
780 error = gfs2_meta_inode_buffer(ip, &dibh);
783 ip->i_inode.i_nlink = 1;
784 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
785 gfs2_dinode_out(ip, dibh->b_data);
793 if (dip->i_alloc.al_rgd)
794 gfs2_inplace_release(dip);
797 gfs2_quota_unlock(dip);
804 static int gfs2_security_init(struct gfs2_inode *dip, struct gfs2_inode *ip)
810 struct gfs2_ea_request er;
812 err = security_inode_init_security(&ip->i_inode, &dip->i_inode,
813 &name, &value, &len);
816 if (err == -EOPNOTSUPP)
821 memset(&er, 0, sizeof(struct gfs2_ea_request));
823 er.er_type = GFS2_EATYPE_SECURITY;
826 er.er_name_len = strlen(name);
827 er.er_data_len = len;
829 err = gfs2_ea_set_i(ip, &er);
838 * gfs2_createi - Create a new inode
839 * @ghs: An array of two holders
840 * @name: The name of the new file
841 * @mode: the permissions on the new inode
843 * @ghs[0] is an initialized holder for the directory
844 * @ghs[1] is the holder for the inode lock
846 * If the return value is not NULL, the glocks on both the directory and the new
847 * file are held. A transaction has been started and an inplace reservation
853 struct inode *gfs2_createi(struct gfs2_holder *ghs, const struct qstr *name,
854 unsigned int mode, dev_t dev)
857 struct gfs2_inode *dip = ghs->gh_gl->gl_object;
858 struct inode *dir = &dip->i_inode;
859 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
860 struct gfs2_inum_host inum = { .no_addr = 0, .no_formal_ino = 0 };
864 if (!name->len || name->len > GFS2_FNAMESIZE)
865 return ERR_PTR(-ENAMETOOLONG);
867 gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs);
868 error = gfs2_glock_nq(ghs);
872 error = create_ok(dip, name, mode);
876 error = pick_formal_ino(sdp, &inum.no_formal_ino);
880 error = alloc_dinode(dip, &inum.no_addr, &generation);
884 error = gfs2_glock_nq_num(sdp, inum.no_addr, &gfs2_inode_glops,
885 LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1);
889 error = make_dinode(dip, ghs[1].gh_gl, mode, &inum, &generation, dev);
893 inode = gfs2_inode_lookup(dir->i_sb, inum.no_addr, IF2DT(mode));
897 error = gfs2_inode_refresh(GFS2_I(inode));
901 error = gfs2_acl_create(dip, GFS2_I(inode));
905 error = gfs2_security_init(dip, GFS2_I(inode));
909 error = link_dinode(dip, name, GFS2_I(inode));
914 return ERR_PTR(-ENOMEM);
920 gfs2_glock_dq_uninit(ghs + 1);
924 return ERR_PTR(error);
928 * gfs2_rmdiri - Remove a directory
929 * @dip: The parent directory of the directory to be removed
930 * @name: The name of the directory to be removed
931 * @ip: The GFS2 inode of the directory to be removed
933 * Assumes Glocks on dip and ip are held
938 int gfs2_rmdiri(struct gfs2_inode *dip, const struct qstr *name,
939 struct gfs2_inode *ip)
944 if (ip->i_di.di_entries != 2) {
945 if (gfs2_consist_inode(ip))
946 gfs2_dinode_print(ip);
950 error = gfs2_dir_del(dip, name);
954 error = gfs2_change_nlink(dip, -1);
958 gfs2_str2qstr(&dotname, ".");
959 error = gfs2_dir_del(ip, &dotname);
963 gfs2_str2qstr(&dotname, "..");
964 error = gfs2_dir_del(ip, &dotname);
968 /* It looks odd, but it really should be done twice */
969 error = gfs2_change_nlink(ip, -1);
973 error = gfs2_change_nlink(ip, -1);
981 * gfs2_unlink_ok - check to see that a inode is still in a directory
982 * @dip: the directory
983 * @name: the name of the file
986 * Assumes that the lock on (at least) @dip is held.
988 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
991 int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
992 const struct gfs2_inode *ip)
996 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
999 if ((dip->i_inode.i_mode & S_ISVTX) &&
1000 dip->i_inode.i_uid != current->fsuid &&
1001 ip->i_inode.i_uid != current->fsuid && !capable(CAP_FOWNER))
1004 if (IS_APPEND(&dip->i_inode))
1007 error = permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL);
1011 error = gfs2_dir_check(&dip->i_inode, name, ip);
1019 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1023 * Follow @to back to the root and make sure we don't encounter @this
1024 * Assumes we already hold the rename lock.
1029 int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1031 struct inode *dir = &to->i_inode;
1032 struct super_block *sb = dir->i_sb;
1037 gfs2_str2qstr(&dotdot, "..");
1042 if (dir == &this->i_inode) {
1046 if (dir == sb->s_root->d_inode) {
1051 tmp = gfs2_lookupi(dir, &dotdot, 1, NULL);
1053 error = PTR_ERR(tmp);
1067 * gfs2_readlinki - return the contents of a symlink
1068 * @ip: the symlink's inode
1069 * @buf: a pointer to the buffer to be filled
1070 * @len: a pointer to the length of @buf
1072 * If @buf is too small, a piece of memory is kmalloc()ed and needs
1073 * to be freed by the caller.
1078 int gfs2_readlinki(struct gfs2_inode *ip, char **buf, unsigned int *len)
1080 struct gfs2_holder i_gh;
1081 struct buffer_head *dibh;
1085 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &i_gh);
1086 error = gfs2_glock_nq_atime(&i_gh);
1088 gfs2_holder_uninit(&i_gh);
1092 if (!ip->i_di.di_size) {
1093 gfs2_consist_inode(ip);
1098 error = gfs2_meta_inode_buffer(ip, &dibh);
1102 x = ip->i_di.di_size + 1;
1104 *buf = kmalloc(x, GFP_KERNEL);
1111 memcpy(*buf, dibh->b_data + sizeof(struct gfs2_dinode), x);
1117 gfs2_glock_dq_uninit(&i_gh);
1122 * gfs2_glock_nq_atime - Acquire a hold on an inode's glock, and
1123 * conditionally update the inode's atime
1124 * @gh: the holder to acquire
1126 * Tests atime (access time) for gfs2_read, gfs2_readdir and gfs2_mmap
1127 * Update if the difference between the current time and the inode's current
1128 * atime is greater than an interval specified at mount.
1133 int gfs2_glock_nq_atime(struct gfs2_holder *gh)
1135 struct gfs2_glock *gl = gh->gh_gl;
1136 struct gfs2_sbd *sdp = gl->gl_sbd;
1137 struct gfs2_inode *ip = gl->gl_object;
1138 s64 curtime, quantum = gfs2_tune_get(sdp, gt_atime_quantum);
1143 if (gfs2_assert_warn(sdp, gh->gh_flags & GL_ATIME) ||
1144 gfs2_assert_warn(sdp, !(gh->gh_flags & GL_ASYNC)) ||
1145 gfs2_assert_warn(sdp, gl->gl_ops == &gfs2_inode_glops))
1148 state = gh->gh_state;
1149 flags = gh->gh_flags;
1151 error = gfs2_glock_nq(gh);
1155 if (test_bit(SDF_NOATIME, &sdp->sd_flags) ||
1156 (sdp->sd_vfs->s_flags & MS_RDONLY))
1159 curtime = get_seconds();
1160 if (curtime - ip->i_inode.i_atime.tv_sec >= quantum) {
1162 gfs2_holder_reinit(LM_ST_EXCLUSIVE, gh->gh_flags & ~LM_FLAG_ANY,
1164 error = gfs2_glock_nq(gh);
1168 /* Verify that atime hasn't been updated while we were
1169 trying to get exclusive lock. */
1171 curtime = get_seconds();
1172 if (curtime - ip->i_inode.i_atime.tv_sec >= quantum) {
1173 struct buffer_head *dibh;
1174 struct gfs2_dinode *di;
1176 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
1177 if (error == -EROFS)
1182 error = gfs2_meta_inode_buffer(ip, &dibh);
1184 goto fail_end_trans;
1186 ip->i_inode.i_atime.tv_sec = curtime;
1188 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1189 di = (struct gfs2_dinode *)dibh->b_data;
1190 di->di_atime = cpu_to_be64(ip->i_inode.i_atime.tv_sec);
1193 gfs2_trans_end(sdp);
1196 /* If someone else has asked for the glock,
1197 unlock and let them have it. Then reacquire
1198 in the original state. */
1199 if (gfs2_glock_is_blocking(gl)) {
1201 gfs2_holder_reinit(state, flags, gh);
1202 return gfs2_glock_nq(gh);
1209 gfs2_trans_end(sdp);
1216 __gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr)
1218 struct buffer_head *dibh;
1221 error = gfs2_meta_inode_buffer(ip, &dibh);
1223 error = inode_setattr(&ip->i_inode, attr);
1224 gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error);
1225 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1226 gfs2_dinode_out(ip, dibh->b_data);
1233 * gfs2_setattr_simple -
1237 * Called with a reference on the vnode.
1242 int gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr)
1246 if (current->journal_info)
1247 return __gfs2_setattr_simple(ip, attr);
1249 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE, 0);
1253 error = __gfs2_setattr_simple(ip, attr);
1254 gfs2_trans_end(GFS2_SB(&ip->i_inode));
1258 void gfs2_dinode_out(const struct gfs2_inode *ip, void *buf)
1260 const struct gfs2_dinode_host *di = &ip->i_di;
1261 struct gfs2_dinode *str = buf;
1263 str->di_header.mh_magic = cpu_to_be32(GFS2_MAGIC);
1264 str->di_header.mh_type = cpu_to_be32(GFS2_METATYPE_DI);
1265 str->di_header.__pad0 = 0;
1266 str->di_header.mh_format = cpu_to_be32(GFS2_FORMAT_DI);
1267 str->di_header.__pad1 = 0;
1268 str->di_num.no_addr = cpu_to_be64(ip->i_no_addr);
1269 str->di_num.no_formal_ino = cpu_to_be64(ip->i_no_formal_ino);
1270 str->di_mode = cpu_to_be32(ip->i_inode.i_mode);
1271 str->di_uid = cpu_to_be32(ip->i_inode.i_uid);
1272 str->di_gid = cpu_to_be32(ip->i_inode.i_gid);
1273 str->di_nlink = cpu_to_be32(ip->i_inode.i_nlink);
1274 str->di_size = cpu_to_be64(di->di_size);
1275 str->di_blocks = cpu_to_be64(di->di_blocks);
1276 str->di_atime = cpu_to_be64(ip->i_inode.i_atime.tv_sec);
1277 str->di_mtime = cpu_to_be64(ip->i_inode.i_mtime.tv_sec);
1278 str->di_ctime = cpu_to_be64(ip->i_inode.i_ctime.tv_sec);
1280 str->di_goal_meta = cpu_to_be64(di->di_goal_meta);
1281 str->di_goal_data = cpu_to_be64(di->di_goal_data);
1282 str->di_generation = cpu_to_be64(di->di_generation);
1284 str->di_flags = cpu_to_be32(di->di_flags);
1285 str->di_height = cpu_to_be16(di->di_height);
1286 str->di_payload_format = cpu_to_be32(S_ISDIR(ip->i_inode.i_mode) &&
1287 !(ip->i_di.di_flags & GFS2_DIF_EXHASH) ?
1288 GFS2_FORMAT_DE : 0);
1289 str->di_depth = cpu_to_be16(di->di_depth);
1290 str->di_entries = cpu_to_be32(di->di_entries);
1292 str->di_eattr = cpu_to_be64(di->di_eattr);
1295 void gfs2_dinode_print(const struct gfs2_inode *ip)
1297 const struct gfs2_dinode_host *di = &ip->i_di;
1299 printk(KERN_INFO " no_formal_ino = %llu\n",
1300 (unsigned long long)ip->i_no_formal_ino);
1301 printk(KERN_INFO " no_addr = %llu\n",
1302 (unsigned long long)ip->i_no_addr);
1303 printk(KERN_INFO " di_size = %llu\n", (unsigned long long)di->di_size);
1304 printk(KERN_INFO " di_blocks = %llu\n",
1305 (unsigned long long)di->di_blocks);
1306 printk(KERN_INFO " di_goal_meta = %llu\n",
1307 (unsigned long long)di->di_goal_meta);
1308 printk(KERN_INFO " di_goal_data = %llu\n",
1309 (unsigned long long)di->di_goal_data);
1310 printk(KERN_INFO " di_flags = 0x%.8X\n", di->di_flags);
1311 printk(KERN_INFO " di_height = %u\n", di->di_height);
1312 printk(KERN_INFO " di_depth = %u\n", di->di_depth);
1313 printk(KERN_INFO " di_entries = %u\n", di->di_entries);
1314 printk(KERN_INFO " di_eattr = %llu\n",
1315 (unsigned long long)di->di_eattr);