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 BUG_ON(ip->i_di.di_nlink != ip->i_inode.i_nlink);
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();
345 ip->i_inode.i_nlink = nlink;
347 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
348 gfs2_dinode_out(&ip->i_di, dibh->b_data);
350 mark_inode_dirty(&ip->i_inode);
352 if (ip->i_di.di_nlink == 0) {
353 struct gfs2_rgrpd *rgd;
354 struct gfs2_holder ri_gh, rg_gh;
356 error = gfs2_rindex_hold(sdp, &ri_gh);
360 rgd = gfs2_blk2rgrpd(sdp, ip->i_num.no_addr);
363 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &rg_gh);
367 gfs2_unlink_di(&ip->i_inode); /* mark inode unlinked */
368 gfs2_glock_dq_uninit(&rg_gh);
370 gfs2_glock_dq_uninit(&ri_gh);
376 struct inode *gfs2_lookup_simple(struct inode *dip, const char *name)
379 gfs2_str2qstr(&qstr, name);
380 return gfs2_lookupi(dip, &qstr, 1, NULL);
385 * gfs2_lookupi - Look up a filename in a directory and return its inode
386 * @d_gh: An initialized holder for the directory glock
387 * @name: The name of the inode to look for
388 * @is_root: If 1, ignore the caller's permissions
389 * @i_gh: An uninitialized holder for the new inode glock
391 * There will always be a vnode (Linux VFS inode) for the d_gh inode unless
397 struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
398 int is_root, struct nameidata *nd)
401 struct super_block *sb = dir->i_sb;
402 struct gfs2_inode *dip = GFS2_I(dir);
403 struct gfs2_holder d_gh;
404 struct gfs2_inum inum;
407 struct inode *inode = NULL;
409 if (!name->len || name->len > GFS2_FNAMESIZE)
410 return ERR_PTR(-ENAMETOOLONG);
412 if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) ||
413 (name->len == 2 && memcmp(name->name, "..", 2) == 0 &&
414 dir == sb->s_root->d_inode)) {
419 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
421 return ERR_PTR(error);
424 error = permission(dir, MAY_EXEC, NULL);
429 error = gfs2_dir_search(dir, name, &inum, &type);
433 inode = gfs2_inode_lookup(sb, &inum, type);
436 gfs2_glock_dq_uninit(&d_gh);
437 if (error == -ENOENT)
442 static int pick_formal_ino_1(struct gfs2_sbd *sdp, uint64_t *formal_ino)
444 struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode);
445 struct buffer_head *bh;
446 struct gfs2_inum_range ir;
449 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
452 mutex_lock(&sdp->sd_inum_mutex);
454 error = gfs2_meta_inode_buffer(ip, &bh);
456 mutex_unlock(&sdp->sd_inum_mutex);
461 gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode));
464 *formal_ino = ir.ir_start++;
466 gfs2_trans_add_bh(ip->i_gl, bh, 1);
467 gfs2_inum_range_out(&ir,
468 bh->b_data + sizeof(struct gfs2_dinode));
470 mutex_unlock(&sdp->sd_inum_mutex);
477 mutex_unlock(&sdp->sd_inum_mutex);
483 static int pick_formal_ino_2(struct gfs2_sbd *sdp, uint64_t *formal_ino)
485 struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode);
486 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_inum_inode);
487 struct gfs2_holder gh;
488 struct buffer_head *bh;
489 struct gfs2_inum_range ir;
492 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
496 error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0);
499 mutex_lock(&sdp->sd_inum_mutex);
501 error = gfs2_meta_inode_buffer(ip, &bh);
505 gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode));
508 struct buffer_head *m_bh;
511 error = gfs2_meta_inode_buffer(m_ip, &m_bh);
515 x = *(uint64_t *)(m_bh->b_data + sizeof(struct gfs2_dinode));
516 x = y = be64_to_cpu(x);
518 ir.ir_length = GFS2_INUM_QUANTUM;
519 x += GFS2_INUM_QUANTUM;
521 gfs2_consist_inode(m_ip);
523 gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1);
524 *(uint64_t *)(m_bh->b_data + sizeof(struct gfs2_dinode)) = x;
529 *formal_ino = ir.ir_start++;
532 gfs2_trans_add_bh(ip->i_gl, bh, 1);
533 gfs2_inum_range_out(&ir, bh->b_data + sizeof(struct gfs2_dinode));
539 mutex_unlock(&sdp->sd_inum_mutex);
543 gfs2_glock_dq_uninit(&gh);
548 static int pick_formal_ino(struct gfs2_sbd *sdp, uint64_t *inum)
552 error = pick_formal_ino_1(sdp, inum);
556 error = pick_formal_ino_2(sdp, inum);
562 * create_ok - OK to create a new on-disk inode here?
563 * @dip: Directory in which dinode is to be created
564 * @name: Name of new dinode
570 static int create_ok(struct gfs2_inode *dip, const struct qstr *name,
575 error = permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, NULL);
579 /* Don't create entries in an unlinked directory */
580 if (!dip->i_di.di_nlink)
583 error = gfs2_dir_search(&dip->i_inode, name, NULL, NULL);
594 if (dip->i_di.di_entries == (uint32_t)-1)
596 if (S_ISDIR(mode) && dip->i_di.di_nlink == (uint32_t)-1)
602 static void munge_mode_uid_gid(struct gfs2_inode *dip, unsigned int *mode,
603 unsigned int *uid, unsigned int *gid)
605 if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir &&
606 (dip->i_di.di_mode & S_ISUID) &&
610 else if (dip->i_di.di_uid != current->fsuid)
612 *uid = dip->i_di.di_uid;
614 *uid = current->fsuid;
616 if (dip->i_di.di_mode & S_ISGID) {
619 *gid = dip->i_di.di_gid;
621 *gid = current->fsgid;
624 static int alloc_dinode(struct gfs2_inode *dip, struct gfs2_inum *inum)
626 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
631 dip->i_alloc.al_requested = RES_DINODE;
632 error = gfs2_inplace_reserve(dip);
636 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS, 0);
640 inum->no_addr = gfs2_alloc_di(dip);
645 gfs2_inplace_release(dip);
654 * init_dinode - Fill in a new dinode structure
655 * @dip: the directory this inode is being created in
656 * @gl: The glock covering the new inode
657 * @inum: the inode number
658 * @mode: the file permissions
664 static void init_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
665 struct gfs2_inum *inum, unsigned int mode,
666 unsigned int uid, unsigned int gid)
668 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
669 struct gfs2_dinode *di;
670 struct buffer_head *dibh;
672 dibh = gfs2_meta_new(gl, inum->no_addr);
673 gfs2_trans_add_bh(gl, dibh, 1);
674 gfs2_metatype_set(dibh, GFS2_METATYPE_DI, GFS2_FORMAT_DI);
675 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
676 di = (struct gfs2_dinode *)dibh->b_data;
678 di->di_num.no_formal_ino = cpu_to_be64(inum->no_formal_ino);
679 di->di_num.no_addr = cpu_to_be64(inum->no_addr);
680 di->di_mode = cpu_to_be32(mode);
681 di->di_uid = cpu_to_be32(uid);
682 di->di_gid = cpu_to_be32(gid);
683 di->di_nlink = cpu_to_be32(0);
684 di->di_size = cpu_to_be64(0);
685 di->di_blocks = cpu_to_be64(1);
686 di->di_atime = di->di_mtime = di->di_ctime = cpu_to_be64(get_seconds());
687 di->di_major = di->di_minor = cpu_to_be32(0);
688 di->di_goal_meta = di->di_goal_data = cpu_to_be64(inum->no_addr);
689 di->__pad[0] = di->__pad[1] = 0;
690 di->di_flags = cpu_to_be32(0);
693 if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_JDATA) ||
694 gfs2_tune_get(sdp, gt_new_files_jdata))
695 di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA);
696 if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_DIRECTIO) ||
697 gfs2_tune_get(sdp, gt_new_files_directio))
698 di->di_flags |= cpu_to_be32(GFS2_DIF_DIRECTIO);
699 } else if (S_ISDIR(mode)) {
700 di->di_flags |= cpu_to_be32(dip->i_di.di_flags &
701 GFS2_DIF_INHERIT_DIRECTIO);
702 di->di_flags |= cpu_to_be32(dip->i_di.di_flags &
703 GFS2_DIF_INHERIT_JDATA);
707 di->di_height = cpu_to_be32(0);
710 di->di_depth = cpu_to_be16(0);
711 di->di_entries = cpu_to_be32(0);
712 memset(&di->__pad4, 0, sizeof(di->__pad4));
713 di->di_eattr = cpu_to_be64(0);
714 memset(&di->di_reserved, 0, sizeof(di->di_reserved));
719 static int make_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
720 unsigned int mode, struct gfs2_inum *inum)
722 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
723 unsigned int uid, gid;
726 munge_mode_uid_gid(dip, &mode, &uid, &gid);
729 error = gfs2_quota_lock(dip, uid, gid);
733 error = gfs2_quota_check(dip, uid, gid);
737 error = gfs2_trans_begin(sdp, RES_DINODE + RES_QUOTA, 0);
741 init_dinode(dip, gl, inum, mode, uid, gid);
742 gfs2_quota_change(dip, +1, uid, gid);
746 gfs2_quota_unlock(dip);
752 static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
753 struct gfs2_inode *ip)
755 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
756 struct gfs2_alloc *al;
758 struct buffer_head *dibh;
761 al = gfs2_alloc_get(dip);
763 error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
767 error = alloc_required = gfs2_diradd_alloc_required(&dip->i_inode, name);
768 if (alloc_required < 0)
770 if (alloc_required) {
771 error = gfs2_quota_check(dip, dip->i_di.di_uid,
774 goto fail_quota_locks;
776 al->al_requested = sdp->sd_max_dirres;
778 error = gfs2_inplace_reserve(dip);
780 goto fail_quota_locks;
782 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
783 al->al_rgd->rd_ri.ri_length +
785 RES_STATFS + RES_QUOTA, 0);
789 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
791 goto fail_quota_locks;
794 error = gfs2_dir_add(&dip->i_inode, name, &ip->i_num, IF2DT(ip->i_di.di_mode));
798 error = gfs2_meta_inode_buffer(ip, &dibh);
801 ip->i_di.di_nlink = 1;
802 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
803 gfs2_dinode_out(&ip->i_di, dibh->b_data);
811 if (dip->i_alloc.al_rgd)
812 gfs2_inplace_release(dip);
815 gfs2_quota_unlock(dip);
823 * gfs2_createi - Create a new inode
824 * @ghs: An array of two holders
825 * @name: The name of the new file
826 * @mode: the permissions on the new inode
828 * @ghs[0] is an initialized holder for the directory
829 * @ghs[1] is the holder for the inode lock
831 * If the return value is not NULL, the glocks on both the directory and the new
832 * file are held. A transaction has been started and an inplace reservation
838 struct inode *gfs2_createi(struct gfs2_holder *ghs, const struct qstr *name,
842 struct gfs2_inode *dip = ghs->gh_gl->gl_object;
843 struct inode *dir = &dip->i_inode;
844 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
845 struct gfs2_inum inum;
848 if (!name->len || name->len > GFS2_FNAMESIZE)
849 return ERR_PTR(-ENAMETOOLONG);
851 gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs);
852 error = gfs2_glock_nq(ghs);
856 error = create_ok(dip, name, mode);
860 error = pick_formal_ino(sdp, &inum.no_formal_ino);
864 error = alloc_dinode(dip, &inum);
868 if (inum.no_addr < dip->i_num.no_addr) {
871 error = gfs2_glock_nq_num(sdp, inum.no_addr,
872 &gfs2_inode_glops, LM_ST_EXCLUSIVE,
875 return ERR_PTR(error);
878 gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs);
879 error = gfs2_glock_nq(ghs);
881 gfs2_glock_dq_uninit(ghs + 1);
882 return ERR_PTR(error);
885 error = create_ok(dip, name, mode);
889 error = gfs2_glock_nq_num(sdp, inum.no_addr,
890 &gfs2_inode_glops, LM_ST_EXCLUSIVE,
896 error = make_dinode(dip, ghs[1].gh_gl, mode, &inum);
900 inode = gfs2_inode_lookup(dir->i_sb, &inum, IF2DT(mode));
904 error = gfs2_inode_refresh(GFS2_I(inode));
908 error = gfs2_acl_create(dip, GFS2_I(inode));
912 error = link_dinode(dip, name, GFS2_I(inode));
917 return ERR_PTR(-ENOMEM);
923 gfs2_glock_dq_uninit(ghs + 1);
927 return ERR_PTR(error);
931 * gfs2_rmdiri - Remove a directory
932 * @dip: The parent directory of the directory to be removed
933 * @name: The name of the directory to be removed
934 * @ip: The GFS2 inode of the directory to be removed
936 * Assumes Glocks on dip and ip are held
941 int gfs2_rmdiri(struct gfs2_inode *dip, const struct qstr *name,
942 struct gfs2_inode *ip)
947 if (ip->i_di.di_entries != 2) {
948 if (gfs2_consist_inode(ip))
949 gfs2_dinode_print(&ip->i_di);
953 error = gfs2_dir_del(dip, name);
957 error = gfs2_change_nlink(dip, -1);
961 gfs2_str2qstr(&dotname, ".");
962 error = gfs2_dir_del(ip, &dotname);
966 gfs2_str2qstr(&dotname, "..");
967 error = gfs2_dir_del(ip, &dotname);
971 error = gfs2_change_nlink(ip, -2);
979 * gfs2_unlink_ok - check to see that a inode is still in a directory
980 * @dip: the directory
981 * @name: the name of the file
984 * Assumes that the lock on (at least) @dip is held.
986 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
989 int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
990 struct gfs2_inode *ip)
992 struct gfs2_inum inum;
996 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
999 if ((dip->i_di.di_mode & S_ISVTX) &&
1000 dip->i_di.di_uid != current->fsuid &&
1001 ip->i_di.di_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_search(&dip->i_inode, name, &inum, &type);
1015 if (!gfs2_inum_equal(&inum, &ip->i_num))
1018 if (IF2DT(ip->i_di.di_mode) != type) {
1019 gfs2_consist_inode(dip);
1027 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1031 * Follow @to back to the root and make sure we don't encounter @this
1032 * Assumes we already hold the rename lock.
1037 int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1039 struct inode *dir = &to->i_inode;
1040 struct super_block *sb = dir->i_sb;
1045 gfs2_str2qstr(&dotdot, "..");
1050 if (dir == &this->i_inode) {
1054 if (dir == sb->s_root->d_inode) {
1059 tmp = gfs2_lookupi(dir, &dotdot, 1, NULL);
1061 error = PTR_ERR(tmp);
1075 * gfs2_readlinki - return the contents of a symlink
1076 * @ip: the symlink's inode
1077 * @buf: a pointer to the buffer to be filled
1078 * @len: a pointer to the length of @buf
1080 * If @buf is too small, a piece of memory is kmalloc()ed and needs
1081 * to be freed by the caller.
1086 int gfs2_readlinki(struct gfs2_inode *ip, char **buf, unsigned int *len)
1088 struct gfs2_holder i_gh;
1089 struct buffer_head *dibh;
1093 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &i_gh);
1094 error = gfs2_glock_nq_atime(&i_gh);
1096 gfs2_holder_uninit(&i_gh);
1100 if (!ip->i_di.di_size) {
1101 gfs2_consist_inode(ip);
1106 error = gfs2_meta_inode_buffer(ip, &dibh);
1110 x = ip->i_di.di_size + 1;
1112 *buf = kmalloc(x, GFP_KERNEL);
1119 memcpy(*buf, dibh->b_data + sizeof(struct gfs2_dinode), x);
1125 gfs2_glock_dq_uninit(&i_gh);
1130 * gfs2_glock_nq_atime - Acquire a hold on an inode's glock, and
1131 * conditionally update the inode's atime
1132 * @gh: the holder to acquire
1134 * Tests atime (access time) for gfs2_read, gfs2_readdir and gfs2_mmap
1135 * Update if the difference between the current time and the inode's current
1136 * atime is greater than an interval specified at mount.
1141 int gfs2_glock_nq_atime(struct gfs2_holder *gh)
1143 struct gfs2_glock *gl = gh->gh_gl;
1144 struct gfs2_sbd *sdp = gl->gl_sbd;
1145 struct gfs2_inode *ip = gl->gl_object;
1146 int64_t curtime, quantum = gfs2_tune_get(sdp, gt_atime_quantum);
1151 if (gfs2_assert_warn(sdp, gh->gh_flags & GL_ATIME) ||
1152 gfs2_assert_warn(sdp, !(gh->gh_flags & GL_ASYNC)) ||
1153 gfs2_assert_warn(sdp, gl->gl_ops == &gfs2_inode_glops))
1156 state = gh->gh_state;
1157 flags = gh->gh_flags;
1159 error = gfs2_glock_nq(gh);
1163 if (test_bit(SDF_NOATIME, &sdp->sd_flags) ||
1164 (sdp->sd_vfs->s_flags & MS_RDONLY))
1167 curtime = get_seconds();
1168 if (curtime - ip->i_di.di_atime >= quantum) {
1170 gfs2_holder_reinit(LM_ST_EXCLUSIVE, gh->gh_flags & ~LM_FLAG_ANY,
1172 error = gfs2_glock_nq(gh);
1176 /* Verify that atime hasn't been updated while we were
1177 trying to get exclusive lock. */
1179 curtime = get_seconds();
1180 if (curtime - ip->i_di.di_atime >= quantum) {
1181 struct buffer_head *dibh;
1183 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
1184 if (error == -EROFS)
1189 error = gfs2_meta_inode_buffer(ip, &dibh);
1191 goto fail_end_trans;
1193 ip->i_di.di_atime = curtime;
1195 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1196 gfs2_dinode_out(&ip->i_di, dibh->b_data);
1199 gfs2_trans_end(sdp);
1202 /* If someone else has asked for the glock,
1203 unlock and let them have it. Then reacquire
1204 in the original state. */
1205 if (gfs2_glock_is_blocking(gl)) {
1207 gfs2_holder_reinit(state, flags, gh);
1208 return gfs2_glock_nq(gh);
1215 gfs2_trans_end(sdp);
1222 * glock_compare_atime - Compare two struct gfs2_glock structures for sort
1223 * @arg_a: the first structure
1224 * @arg_b: the second structure
1226 * Returns: 1 if A > B
1231 static int glock_compare_atime(const void *arg_a, const void *arg_b)
1233 struct gfs2_holder *gh_a = *(struct gfs2_holder **)arg_a;
1234 struct gfs2_holder *gh_b = *(struct gfs2_holder **)arg_b;
1235 struct lm_lockname *a = &gh_a->gh_gl->gl_name;
1236 struct lm_lockname *b = &gh_b->gh_gl->gl_name;
1239 if (a->ln_number > b->ln_number)
1241 else if (a->ln_number < b->ln_number)
1244 if (gh_a->gh_state == LM_ST_SHARED &&
1245 gh_b->gh_state == LM_ST_EXCLUSIVE)
1247 else if (gh_a->gh_state == LM_ST_SHARED &&
1248 (gh_b->gh_flags & GL_ATIME))
1256 * gfs2_glock_nq_m_atime - acquire multiple glocks where one may need an
1258 * @num_gh: the number of structures
1259 * @ghs: an array of struct gfs2_holder structures
1261 * Returns: 0 on success (all glocks acquired),
1262 * errno on failure (no glocks acquired)
1265 int gfs2_glock_nq_m_atime(unsigned int num_gh, struct gfs2_holder *ghs)
1267 struct gfs2_holder **p;
1275 ghs->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC);
1276 if (ghs->gh_flags & GL_ATIME)
1277 error = gfs2_glock_nq_atime(ghs);
1279 error = gfs2_glock_nq(ghs);
1283 p = kcalloc(num_gh, sizeof(struct gfs2_holder *), GFP_KERNEL);
1287 for (x = 0; x < num_gh; x++)
1290 sort(p, num_gh, sizeof(struct gfs2_holder *), glock_compare_atime,NULL);
1292 for (x = 0; x < num_gh; x++) {
1293 p[x]->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC);
1295 if (p[x]->gh_flags & GL_ATIME)
1296 error = gfs2_glock_nq_atime(p[x]);
1298 error = gfs2_glock_nq(p[x]);
1302 gfs2_glock_dq(p[x]);
1314 __gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr)
1316 struct buffer_head *dibh;
1319 error = gfs2_meta_inode_buffer(ip, &dibh);
1321 error = inode_setattr(&ip->i_inode, attr);
1322 gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error);
1323 gfs2_inode_attr_out(ip);
1325 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1326 gfs2_dinode_out(&ip->i_di, dibh->b_data);
1333 * gfs2_setattr_simple -
1337 * Called with a reference on the vnode.
1342 int gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr)
1346 if (current->journal_info)
1347 return __gfs2_setattr_simple(ip, attr);
1349 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE, 0);
1353 error = __gfs2_setattr_simple(ip, attr);
1355 gfs2_trans_end(GFS2_SB(&ip->i_inode));