2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2011 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/slab.h>
11 #include <linux/spinlock.h>
12 #include <linux/completion.h>
13 #include <linux/buffer_head.h>
14 #include <linux/namei.h>
16 #include <linux/xattr.h>
17 #include <linux/posix_acl.h>
18 #include <linux/gfs2_ondisk.h>
19 #include <linux/crc32.h>
20 #include <linux/fiemap.h>
21 #include <linux/security.h>
22 #include <asm/uaccess.h>
40 struct gfs2_skip_data {
46 static int iget_test(struct inode *inode, void *opaque)
48 struct gfs2_inode *ip = GFS2_I(inode);
49 struct gfs2_skip_data *data = opaque;
51 if (ip->i_no_addr == data->no_addr) {
52 if (data->non_block &&
53 inode->i_state & (I_FREEING|I_CLEAR|I_WILL_FREE)) {
62 static int iget_set(struct inode *inode, void *opaque)
64 struct gfs2_inode *ip = GFS2_I(inode);
65 struct gfs2_skip_data *data = opaque;
69 inode->i_ino = (unsigned long)(data->no_addr);
70 ip->i_no_addr = data->no_addr;
74 struct inode *gfs2_ilookup(struct super_block *sb, u64 no_addr, int non_block)
76 unsigned long hash = (unsigned long)no_addr;
77 struct gfs2_skip_data data;
79 data.no_addr = no_addr;
81 data.non_block = non_block;
82 return ilookup5(sb, hash, iget_test, &data);
85 static struct inode *gfs2_iget(struct super_block *sb, u64 no_addr,
88 struct gfs2_skip_data data;
89 unsigned long hash = (unsigned long)no_addr;
91 data.no_addr = no_addr;
93 data.non_block = non_block;
94 return iget5_locked(sb, hash, iget_test, iget_set, &data);
98 * gfs2_set_iop - Sets inode operations
99 * @inode: The inode with correct i_mode filled in
101 * GFS2 lookup code fills in vfs inode contents based on info obtained
102 * from directory entry inside gfs2_inode_lookup().
105 static void gfs2_set_iop(struct inode *inode)
107 struct gfs2_sbd *sdp = GFS2_SB(inode);
108 umode_t mode = inode->i_mode;
111 inode->i_op = &gfs2_file_iops;
112 if (gfs2_localflocks(sdp))
113 inode->i_fop = &gfs2_file_fops_nolock;
115 inode->i_fop = &gfs2_file_fops;
116 } else if (S_ISDIR(mode)) {
117 inode->i_op = &gfs2_dir_iops;
118 if (gfs2_localflocks(sdp))
119 inode->i_fop = &gfs2_dir_fops_nolock;
121 inode->i_fop = &gfs2_dir_fops;
122 } else if (S_ISLNK(mode)) {
123 inode->i_op = &gfs2_symlink_iops;
125 inode->i_op = &gfs2_file_iops;
126 init_special_inode(inode, inode->i_mode, inode->i_rdev);
131 * gfs2_inode_lookup - Lookup an inode
132 * @sb: The super block
133 * @no_addr: The inode number
134 * @type: The type of the inode
135 * non_block: Can we block on inodes that are being freed?
137 * Returns: A VFS inode, or an error
140 struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned int type,
141 u64 no_addr, u64 no_formal_ino, int non_block)
144 struct gfs2_inode *ip;
145 struct gfs2_glock *io_gl = NULL;
148 inode = gfs2_iget(sb, no_addr, non_block);
152 return ERR_PTR(-ENOBUFS);
154 if (inode->i_state & I_NEW) {
155 struct gfs2_sbd *sdp = GFS2_SB(inode);
156 ip->i_no_formal_ino = no_formal_ino;
158 error = gfs2_glock_get(sdp, no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
161 ip->i_gl->gl_object = ip;
163 error = gfs2_glock_get(sdp, no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
167 set_bit(GIF_INVALID, &ip->i_flags);
168 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
172 ip->i_iopen_gh.gh_gl->gl_object = ip;
173 gfs2_glock_put(io_gl);
176 if (type == DT_UNKNOWN) {
177 /* Inode glock must be locked already */
178 error = gfs2_inode_refresh(GFS2_I(inode));
182 inode->i_mode = DT2IF(type);
186 unlock_new_inode(inode);
192 ip->i_iopen_gh.gh_gl->gl_object = NULL;
193 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
196 gfs2_glock_put(io_gl);
198 ip->i_gl->gl_object = NULL;
199 gfs2_glock_put(ip->i_gl);
202 return ERR_PTR(error);
205 struct inode *gfs2_lookup_by_inum(struct gfs2_sbd *sdp, u64 no_addr,
206 u64 *no_formal_ino, unsigned int blktype)
208 struct super_block *sb = sdp->sd_vfs;
209 struct gfs2_holder i_gh;
210 struct inode *inode = NULL;
213 /* Must not read in block until block type is verified */
214 error = gfs2_glock_nq_num(sdp, no_addr, &gfs2_inode_glops,
215 LM_ST_EXCLUSIVE, GL_SKIP, &i_gh);
217 return ERR_PTR(error);
219 error = gfs2_check_blk_type(sdp, no_addr, blktype);
223 inode = gfs2_inode_lookup(sb, DT_UNKNOWN, no_addr, 0, 1);
227 /* Two extra checks for NFS only */
230 if (GFS2_I(inode)->i_no_formal_ino != *no_formal_ino)
234 if (GFS2_I(inode)->i_diskflags & GFS2_DIF_SYSTEM)
241 gfs2_glock_dq_uninit(&i_gh);
242 return error ? ERR_PTR(error) : inode;
249 struct inode *gfs2_lookup_simple(struct inode *dip, const char *name)
253 gfs2_str2qstr(&qstr, name);
254 inode = gfs2_lookupi(dip, &qstr, 1);
255 /* gfs2_lookupi has inconsistent callers: vfs
256 * related routines expect NULL for no entry found,
257 * gfs2_lookup_simple callers expect ENOENT
258 * and do not check for NULL.
261 return ERR_PTR(-ENOENT);
268 * gfs2_lookupi - Look up a filename in a directory and return its inode
269 * @d_gh: An initialized holder for the directory glock
270 * @name: The name of the inode to look for
271 * @is_root: If 1, ignore the caller's permissions
272 * @i_gh: An uninitialized holder for the new inode glock
274 * This can be called via the VFS filldir function when NFS is doing
275 * a readdirplus and the inode which its intending to stat isn't
276 * already in cache. In this case we must not take the directory glock
277 * again, since the readdir call will have already taken that lock.
282 struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
285 struct super_block *sb = dir->i_sb;
286 struct gfs2_inode *dip = GFS2_I(dir);
287 struct gfs2_holder d_gh;
289 struct inode *inode = NULL;
292 if (!name->len || name->len > GFS2_FNAMESIZE)
293 return ERR_PTR(-ENAMETOOLONG);
295 if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) ||
296 (name->len == 2 && memcmp(name->name, "..", 2) == 0 &&
297 dir == sb->s_root->d_inode)) {
302 if (gfs2_glock_is_locked_by_me(dip->i_gl) == NULL) {
303 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
305 return ERR_PTR(error);
310 error = gfs2_permission(dir, MAY_EXEC);
315 inode = gfs2_dir_search(dir, name);
317 error = PTR_ERR(inode);
320 gfs2_glock_dq_uninit(&d_gh);
321 if (error == -ENOENT)
323 return inode ? inode : ERR_PTR(error);
327 * create_ok - OK to create a new on-disk inode here?
328 * @dip: Directory in which dinode is to be created
329 * @name: Name of new dinode
335 static int create_ok(struct gfs2_inode *dip, const struct qstr *name,
340 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
344 /* Don't create entries in an unlinked directory */
345 if (!dip->i_inode.i_nlink)
348 error = gfs2_dir_check(&dip->i_inode, name, NULL);
359 if (dip->i_entries == (u32)-1)
361 if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1)
367 static void munge_mode_uid_gid(struct gfs2_inode *dip, umode_t *mode,
368 unsigned int *uid, unsigned int *gid)
370 if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir &&
371 (dip->i_inode.i_mode & S_ISUID) && dip->i_inode.i_uid) {
374 else if (dip->i_inode.i_uid != current_fsuid())
376 *uid = dip->i_inode.i_uid;
378 *uid = current_fsuid();
380 if (dip->i_inode.i_mode & S_ISGID) {
383 *gid = dip->i_inode.i_gid;
385 *gid = current_fsgid();
388 static int alloc_dinode(struct gfs2_inode *dip, u64 *no_addr, u64 *generation)
390 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
394 error = gfs2_inplace_reserve(dip, RES_DINODE);
398 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS, 0);
402 error = gfs2_alloc_blocks(dip, no_addr, &dblocks, 1, generation);
407 gfs2_inplace_release(dip);
412 static void gfs2_init_dir(struct buffer_head *dibh,
413 const struct gfs2_inode *parent)
415 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
416 struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1);
418 gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent);
419 dent->de_inum = di->di_num; /* already GFS2 endian */
420 dent->de_type = cpu_to_be16(DT_DIR);
422 dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1));
423 gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent);
424 gfs2_inum_out(parent, dent);
425 dent->de_type = cpu_to_be16(DT_DIR);
430 * init_dinode - Fill in a new dinode structure
431 * @dip: The directory this inode is being created in
432 * @gl: The glock covering the new inode
433 * @inum: The inode number
434 * @mode: The file permissions
435 * @uid: The uid of the new inode
436 * @gid: The gid of the new inode
437 * @generation: The generation number of the new inode
438 * @dev: The device number (if a device node)
439 * @symname: The symlink destination (if a symlink)
440 * @size: The inode size (ignored for directories)
441 * @bhp: The buffer head (returned to caller)
445 static void init_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
446 const struct gfs2_inum_host *inum, umode_t mode,
447 unsigned int uid, unsigned int gid,
448 const u64 *generation, dev_t dev, const char *symname,
449 unsigned size, struct buffer_head **bhp)
451 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
452 struct gfs2_dinode *di;
453 struct buffer_head *dibh;
454 struct timespec tv = CURRENT_TIME;
456 dibh = gfs2_meta_new(gl, inum->no_addr);
457 gfs2_trans_add_bh(gl, dibh, 1);
458 gfs2_metatype_set(dibh, GFS2_METATYPE_DI, GFS2_FORMAT_DI);
459 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
460 di = (struct gfs2_dinode *)dibh->b_data;
462 di->di_num.no_formal_ino = cpu_to_be64(inum->no_formal_ino);
463 di->di_num.no_addr = cpu_to_be64(inum->no_addr);
464 di->di_mode = cpu_to_be32(mode);
465 di->di_uid = cpu_to_be32(uid);
466 di->di_gid = cpu_to_be32(gid);
468 di->di_size = cpu_to_be64(size);
469 di->di_blocks = cpu_to_be64(1);
470 di->di_atime = di->di_mtime = di->di_ctime = cpu_to_be64(tv.tv_sec);
471 di->di_major = cpu_to_be32(MAJOR(dev));
472 di->di_minor = cpu_to_be32(MINOR(dev));
473 di->di_goal_meta = di->di_goal_data = cpu_to_be64(inum->no_addr);
474 di->di_generation = cpu_to_be64(*generation);
477 di->di_payload_format = cpu_to_be32(S_ISDIR(mode) ? GFS2_FORMAT_DE : 0);
483 memset(&di->__pad4, 0, sizeof(di->__pad4));
485 di->di_atime_nsec = cpu_to_be32(tv.tv_nsec);
486 di->di_mtime_nsec = cpu_to_be32(tv.tv_nsec);
487 di->di_ctime_nsec = cpu_to_be32(tv.tv_nsec);
488 memset(&di->di_reserved, 0, sizeof(di->di_reserved));
490 switch(mode & S_IFMT) {
492 if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) ||
493 gfs2_tune_get(sdp, gt_new_files_jdata))
494 di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA);
497 di->di_flags |= cpu_to_be32(dip->i_diskflags &
498 GFS2_DIF_INHERIT_JDATA);
499 di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA);
500 di->di_size = cpu_to_be64(sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode));
501 di->di_entries = cpu_to_be32(2);
502 gfs2_init_dir(dibh, dip);
505 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, size);
509 set_buffer_uptodate(dibh);
514 static int make_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
515 umode_t mode, const struct gfs2_inum_host *inum,
516 const u64 *generation, dev_t dev, const char *symname,
517 unsigned int size, struct buffer_head **bhp)
519 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
520 unsigned int uid, gid;
523 munge_mode_uid_gid(dip, &mode, &uid, &gid);
524 if (!gfs2_qadata_get(dip))
527 error = gfs2_quota_lock(dip, uid, gid);
531 error = gfs2_quota_check(dip, uid, gid);
535 error = gfs2_trans_begin(sdp, RES_DINODE + RES_QUOTA, 0);
539 init_dinode(dip, gl, inum, mode, uid, gid, generation, dev, symname, size, bhp);
540 gfs2_quota_change(dip, +1, uid, gid);
544 gfs2_quota_unlock(dip);
546 gfs2_qadata_put(dip);
550 static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
551 struct gfs2_inode *ip)
553 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
554 struct gfs2_qadata *qa;
556 struct buffer_head *dibh;
559 qa = gfs2_qadata_get(dip);
563 error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
567 error = alloc_required = gfs2_diradd_alloc_required(&dip->i_inode, name);
568 if (alloc_required < 0)
569 goto fail_quota_locks;
570 if (alloc_required) {
571 error = gfs2_quota_check(dip, dip->i_inode.i_uid, dip->i_inode.i_gid);
573 goto fail_quota_locks;
575 error = gfs2_inplace_reserve(dip, sdp->sd_max_dirres);
577 goto fail_quota_locks;
579 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
580 dip->i_rgd->rd_length +
582 RES_STATFS + RES_QUOTA, 0);
586 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
588 goto fail_quota_locks;
591 error = gfs2_dir_add(&dip->i_inode, name, ip);
595 error = gfs2_meta_inode_buffer(ip, &dibh);
598 set_nlink(&ip->i_inode, S_ISDIR(ip->i_inode.i_mode) ? 2 : 1);
599 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
600 gfs2_dinode_out(ip, dibh->b_data);
608 gfs2_inplace_release(dip);
611 gfs2_quota_unlock(dip);
614 gfs2_qadata_put(dip);
618 static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array,
621 const struct xattr *xattr;
624 for (xattr = xattr_array; xattr->name != NULL; xattr++) {
625 err = __gfs2_xattr_set(inode, xattr->name, xattr->value,
627 GFS2_EATYPE_SECURITY);
634 static int gfs2_security_init(struct gfs2_inode *dip, struct gfs2_inode *ip,
635 const struct qstr *qstr)
637 return security_inode_init_security(&ip->i_inode, &dip->i_inode, qstr,
638 &gfs2_initxattrs, NULL);
642 * gfs2_create_inode - Create a new inode
643 * @dir: The parent directory
644 * @dentry: The new dentry
645 * @mode: The permissions on the new inode
646 * @dev: For device nodes, this is the device number
647 * @symname: For symlinks, this is the link destination
648 * @size: The initial size of the inode (ignored for directories)
650 * Returns: 0 on success, or error code
653 static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
654 umode_t mode, dev_t dev, const char *symname,
655 unsigned int size, int excl)
657 const struct qstr *name = &dentry->d_name;
658 struct gfs2_holder ghs[2];
659 struct inode *inode = NULL;
660 struct gfs2_inode *dip = GFS2_I(dir);
661 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
662 struct gfs2_inum_host inum = { .no_addr = 0, .no_formal_ino = 0 };
665 struct buffer_head *bh = NULL;
667 if (!name->len || name->len > GFS2_FNAMESIZE)
668 return -ENAMETOOLONG;
670 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
674 error = create_ok(dip, name, mode);
675 if ((error == -EEXIST) && S_ISREG(mode) && !excl) {
676 inode = gfs2_lookupi(dir, &dentry->d_name, 0);
677 gfs2_glock_dq_uninit(ghs);
678 d_instantiate(dentry, inode);
679 return IS_ERR(inode) ? PTR_ERR(inode) : 0;
684 error = alloc_dinode(dip, &inum.no_addr, &generation);
687 inum.no_formal_ino = generation;
689 error = gfs2_glock_nq_num(sdp, inum.no_addr, &gfs2_inode_glops,
690 LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1);
694 error = make_dinode(dip, ghs[1].gh_gl, mode, &inum, &generation, dev, symname, size, &bh);
698 inode = gfs2_inode_lookup(dir->i_sb, IF2DT(mode), inum.no_addr,
699 inum.no_formal_ino, 0);
703 error = gfs2_inode_refresh(GFS2_I(inode));
707 error = gfs2_acl_create(dip, inode);
711 error = gfs2_security_init(dip, GFS2_I(inode), name);
715 error = link_dinode(dip, name, GFS2_I(inode));
723 /* Check if we reserved space in the rgrp. Function link_dinode may
724 not, depending on whether alloc is required. */
726 gfs2_inplace_release(dip);
727 gfs2_quota_unlock(dip);
728 gfs2_qadata_put(dip);
729 mark_inode_dirty(inode);
730 gfs2_glock_dq_uninit_m(2, ghs);
731 d_instantiate(dentry, inode);
735 gfs2_glock_dq_uninit(ghs + 1);
737 gfs2_glock_dq_uninit(ghs);
738 if (inode && !IS_ERR(inode)) {
739 set_bit(GIF_ALLOC_FAILED, &GFS2_I(inode)->i_flags);
749 * gfs2_create - Create a file
750 * @dir: The directory in which to create the file
751 * @dentry: The dentry of the new file
752 * @mode: The mode of the new file
757 static int gfs2_create(struct inode *dir, struct dentry *dentry,
758 umode_t mode, struct nameidata *nd)
761 if (nd && (nd->flags & LOOKUP_EXCL))
763 return gfs2_create_inode(dir, dentry, S_IFREG | mode, 0, NULL, 0, excl);
767 * gfs2_lookup - Look up a filename in a directory and return its inode
768 * @dir: The directory inode
769 * @dentry: The dentry of the new inode
770 * @nd: passed from Linux VFS, ignored by us
772 * Called by the VFS layer. Lock dir and call gfs2_lookupi()
777 static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
778 struct nameidata *nd)
780 struct inode *inode = gfs2_lookupi(dir, &dentry->d_name, 0);
781 if (inode && !IS_ERR(inode)) {
782 struct gfs2_glock *gl = GFS2_I(inode)->i_gl;
783 struct gfs2_holder gh;
785 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
788 return ERR_PTR(error);
790 gfs2_glock_dq_uninit(&gh);
792 return d_splice_alias(inode, dentry);
796 * gfs2_link - Link to a file
797 * @old_dentry: The inode to link
798 * @dir: Add link to this directory
799 * @dentry: The name of the link
801 * Link the inode in "old_dentry" into the directory "dir" with the
807 static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
808 struct dentry *dentry)
810 struct gfs2_inode *dip = GFS2_I(dir);
811 struct gfs2_sbd *sdp = GFS2_SB(dir);
812 struct inode *inode = old_dentry->d_inode;
813 struct gfs2_inode *ip = GFS2_I(inode);
814 struct gfs2_holder ghs[2];
815 struct buffer_head *dibh;
819 if (S_ISDIR(inode->i_mode))
822 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
823 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
825 error = gfs2_glock_nq(ghs); /* parent */
829 error = gfs2_glock_nq(ghs + 1); /* child */
834 if (inode->i_nlink == 0)
837 error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC);
841 error = gfs2_dir_check(dir, &dentry->d_name, NULL);
852 if (!dip->i_inode.i_nlink)
855 if (dip->i_entries == (u32)-1)
858 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
861 if (!ip->i_inode.i_nlink)
864 if (ip->i_inode.i_nlink == (u32)-1)
867 alloc_required = error = gfs2_diradd_alloc_required(dir, &dentry->d_name);
872 if (alloc_required) {
873 struct gfs2_qadata *qa = gfs2_qadata_get(dip);
880 error = gfs2_quota_lock_check(dip);
884 error = gfs2_inplace_reserve(dip, sdp->sd_max_dirres);
888 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
889 gfs2_rg_blocks(dip) +
890 2 * RES_DINODE + RES_STATFS +
895 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
900 error = gfs2_meta_inode_buffer(ip, &dibh);
904 error = gfs2_dir_add(dir, &dentry->d_name, ip);
908 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
909 inc_nlink(&ip->i_inode);
910 ip->i_inode.i_ctime = CURRENT_TIME;
912 d_instantiate(dentry, inode);
913 mark_inode_dirty(inode);
921 gfs2_inplace_release(dip);
924 gfs2_quota_unlock(dip);
927 gfs2_qadata_put(dip);
929 gfs2_glock_dq(ghs + 1);
933 gfs2_holder_uninit(ghs);
934 gfs2_holder_uninit(ghs + 1);
939 * gfs2_unlink_ok - check to see that a inode is still in a directory
940 * @dip: the directory
941 * @name: the name of the file
944 * Assumes that the lock on (at least) @dip is held.
946 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
949 static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
950 const struct gfs2_inode *ip)
954 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
957 if ((dip->i_inode.i_mode & S_ISVTX) &&
958 dip->i_inode.i_uid != current_fsuid() &&
959 ip->i_inode.i_uid != current_fsuid() && !capable(CAP_FOWNER))
962 if (IS_APPEND(&dip->i_inode))
965 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
969 error = gfs2_dir_check(&dip->i_inode, name, ip);
977 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it
978 * @dip: The parent directory
979 * @name: The name of the entry in the parent directory
980 * @bh: The inode buffer for the inode to be removed
981 * @inode: The inode to be removed
983 * Called with all the locks and in a transaction. This will only be
984 * called for a directory after it has been checked to ensure it is empty.
986 * Returns: 0 on success, or an error
989 static int gfs2_unlink_inode(struct gfs2_inode *dip,
990 const struct dentry *dentry,
991 struct buffer_head *bh)
993 struct inode *inode = dentry->d_inode;
994 struct gfs2_inode *ip = GFS2_I(inode);
997 error = gfs2_dir_del(dip, dentry);
1002 inode->i_ctime = CURRENT_TIME;
1003 if (S_ISDIR(inode->i_mode))
1007 mark_inode_dirty(inode);
1008 if (inode->i_nlink == 0)
1009 gfs2_unlink_di(inode);
1015 * gfs2_unlink - Unlink an inode (this does rmdir as well)
1016 * @dir: The inode of the directory containing the inode to unlink
1017 * @dentry: The file itself
1019 * This routine uses the type of the inode as a flag to figure out
1020 * whether this is an unlink or an rmdir.
1025 static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
1027 struct gfs2_inode *dip = GFS2_I(dir);
1028 struct gfs2_sbd *sdp = GFS2_SB(dir);
1029 struct inode *inode = dentry->d_inode;
1030 struct gfs2_inode *ip = GFS2_I(inode);
1031 struct buffer_head *bh;
1032 struct gfs2_holder ghs[3];
1033 struct gfs2_rgrpd *rgd;
1036 error = gfs2_rindex_update(sdp);
1042 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1043 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
1045 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
1049 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
1052 error = gfs2_glock_nq(ghs); /* parent */
1056 error = gfs2_glock_nq(ghs + 1); /* child */
1061 if (inode->i_nlink == 0)
1064 if (S_ISDIR(inode->i_mode)) {
1066 if (ip->i_entries > 2 || inode->i_nlink > 2)
1070 error = gfs2_glock_nq(ghs + 2); /* rgrp */
1074 error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
1078 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0);
1082 error = gfs2_meta_inode_buffer(ip, &bh);
1086 error = gfs2_unlink_inode(dip, dentry, bh);
1090 gfs2_trans_end(sdp);
1092 gfs2_glock_dq(ghs + 2);
1094 gfs2_glock_dq(ghs + 1);
1098 gfs2_holder_uninit(ghs + 2);
1100 gfs2_holder_uninit(ghs + 1);
1101 gfs2_holder_uninit(ghs);
1106 * gfs2_symlink - Create a symlink
1107 * @dir: The directory to create the symlink in
1108 * @dentry: The dentry to put the symlink in
1109 * @symname: The thing which the link points to
1114 static int gfs2_symlink(struct inode *dir, struct dentry *dentry,
1115 const char *symname)
1117 struct gfs2_sbd *sdp = GFS2_SB(dir);
1120 size = strlen(symname);
1121 if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1)
1122 return -ENAMETOOLONG;
1124 return gfs2_create_inode(dir, dentry, S_IFLNK | S_IRWXUGO, 0, symname, size, 0);
1128 * gfs2_mkdir - Make a directory
1129 * @dir: The parent directory of the new one
1130 * @dentry: The dentry of the new directory
1131 * @mode: The mode of the new directory
1136 static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
1138 return gfs2_create_inode(dir, dentry, S_IFDIR | mode, 0, NULL, 0, 0);
1142 * gfs2_mknod - Make a special file
1143 * @dir: The directory in which the special file will reside
1144 * @dentry: The dentry of the special file
1145 * @mode: The mode of the special file
1146 * @dev: The device specification of the special file
1150 static int gfs2_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
1153 return gfs2_create_inode(dir, dentry, mode, dev, NULL, 0, 0);
1157 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1161 * Follow @to back to the root and make sure we don't encounter @this
1162 * Assumes we already hold the rename lock.
1167 static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1169 struct inode *dir = &to->i_inode;
1170 struct super_block *sb = dir->i_sb;
1177 if (dir == &this->i_inode) {
1181 if (dir == sb->s_root->d_inode) {
1186 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1);
1188 error = PTR_ERR(tmp);
1202 * gfs2_rename - Rename a file
1203 * @odir: Parent directory of old file name
1204 * @odentry: The old dentry of the file
1205 * @ndir: Parent directory of new file name
1206 * @ndentry: The new dentry of the file
1211 static int gfs2_rename(struct inode *odir, struct dentry *odentry,
1212 struct inode *ndir, struct dentry *ndentry)
1214 struct gfs2_inode *odip = GFS2_I(odir);
1215 struct gfs2_inode *ndip = GFS2_I(ndir);
1216 struct gfs2_inode *ip = GFS2_I(odentry->d_inode);
1217 struct gfs2_inode *nip = NULL;
1218 struct gfs2_sbd *sdp = GFS2_SB(odir);
1219 struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, };
1220 struct gfs2_rgrpd *nrgd;
1221 unsigned int num_gh;
1223 int alloc_required = 0;
1227 if (ndentry->d_inode) {
1228 nip = GFS2_I(ndentry->d_inode);
1233 error = gfs2_rindex_update(sdp);
1238 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1243 if (S_ISDIR(ip->i_inode.i_mode)) {
1245 /* don't move a dirctory into it's subdir */
1246 error = gfs2_ok_to_move(ip, ndip);
1253 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1255 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1258 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1262 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1264 /* grab the resource lock for unlink flag twiddling
1265 * this is the case of the target file already existing
1266 * so we unlink before doing the rename
1268 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1);
1270 gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++);
1273 for (x = 0; x < num_gh; x++) {
1274 error = gfs2_glock_nq(ghs + x);
1280 if (ip->i_inode.i_nlink == 0)
1283 /* Check out the old directory */
1285 error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
1289 /* Check out the new directory */
1292 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1296 if (nip->i_inode.i_nlink == 0) {
1301 if (S_ISDIR(nip->i_inode.i_mode)) {
1302 if (nip->i_entries < 2) {
1303 gfs2_consist_inode(nip);
1307 if (nip->i_entries > 2) {
1313 error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC);
1317 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL);
1329 if (!ndip->i_inode.i_nlink) {
1333 if (ndip->i_entries == (u32)-1) {
1337 if (S_ISDIR(ip->i_inode.i_mode) &&
1338 ndip->i_inode.i_nlink == (u32)-1) {
1345 /* Check out the dir to be renamed */
1348 error = gfs2_permission(odentry->d_inode, MAY_WRITE);
1354 alloc_required = gfs2_diradd_alloc_required(ndir, &ndentry->d_name);
1355 error = alloc_required;
1359 if (alloc_required) {
1360 struct gfs2_qadata *qa = gfs2_qadata_get(ndip);
1367 error = gfs2_quota_lock_check(ndip);
1371 error = gfs2_inplace_reserve(ndip, sdp->sd_max_dirres);
1375 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
1376 gfs2_rg_blocks(ndip) +
1377 4 * RES_DINODE + 4 * RES_LEAF +
1378 RES_STATFS + RES_QUOTA + 4, 0);
1382 error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
1383 5 * RES_LEAF + 4, 0);
1388 /* Remove the target file, if it exists */
1391 struct buffer_head *bh;
1392 error = gfs2_meta_inode_buffer(nip, &bh);
1395 error = gfs2_unlink_inode(ndip, ndentry, bh);
1400 error = gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR);
1404 struct buffer_head *dibh;
1405 error = gfs2_meta_inode_buffer(ip, &dibh);
1408 ip->i_inode.i_ctime = CURRENT_TIME;
1409 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1410 gfs2_dinode_out(ip, dibh->b_data);
1414 error = gfs2_dir_del(odip, odentry);
1418 error = gfs2_dir_add(ndir, &ndentry->d_name, ip);
1423 gfs2_trans_end(sdp);
1426 gfs2_inplace_release(ndip);
1429 gfs2_quota_unlock(ndip);
1432 gfs2_qadata_put(ndip);
1435 gfs2_glock_dq(ghs + x);
1436 gfs2_holder_uninit(ghs + x);
1440 gfs2_glock_dq_uninit(&r_gh);
1446 * gfs2_follow_link - Follow a symbolic link
1447 * @dentry: The dentry of the link
1448 * @nd: Data that we pass to vfs_follow_link()
1450 * This can handle symlinks of any size.
1452 * Returns: 0 on success or error code
1455 static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd)
1457 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
1458 struct gfs2_holder i_gh;
1459 struct buffer_head *dibh;
1464 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
1465 error = gfs2_glock_nq(&i_gh);
1467 gfs2_holder_uninit(&i_gh);
1468 nd_set_link(nd, ERR_PTR(error));
1472 size = (unsigned int)i_size_read(&ip->i_inode);
1474 gfs2_consist_inode(ip);
1475 buf = ERR_PTR(-EIO);
1479 error = gfs2_meta_inode_buffer(ip, &dibh);
1481 buf = ERR_PTR(error);
1485 buf = kzalloc(size + 1, GFP_NOFS);
1487 buf = ERR_PTR(-ENOMEM);
1489 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size);
1492 gfs2_glock_dq_uninit(&i_gh);
1493 nd_set_link(nd, buf);
1497 static void gfs2_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
1499 char *s = nd_get_link(nd);
1507 * @mask: The mask to be tested
1508 * @flags: Indicates whether this is an RCU path walk or not
1510 * This may be called from the VFS directly, or from within GFS2 with the
1511 * inode locked, so we look to see if the glock is already locked and only
1512 * lock the glock if its not already been done.
1517 int gfs2_permission(struct inode *inode, int mask)
1519 struct gfs2_inode *ip;
1520 struct gfs2_holder i_gh;
1526 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1527 if (mask & MAY_NOT_BLOCK)
1529 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
1535 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
1538 error = generic_permission(inode, mask);
1540 gfs2_glock_dq_uninit(&i_gh);
1545 static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1547 setattr_copy(inode, attr);
1548 mark_inode_dirty(inode);
1553 * gfs2_setattr_simple -
1560 int gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1564 if (current->journal_info)
1565 return __gfs2_setattr_simple(inode, attr);
1567 error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0);
1571 error = __gfs2_setattr_simple(inode, attr);
1572 gfs2_trans_end(GFS2_SB(inode));
1576 static int setattr_chown(struct inode *inode, struct iattr *attr)
1578 struct gfs2_inode *ip = GFS2_I(inode);
1579 struct gfs2_sbd *sdp = GFS2_SB(inode);
1580 u32 ouid, ogid, nuid, ngid;
1583 ouid = inode->i_uid;
1584 ogid = inode->i_gid;
1585 nuid = attr->ia_uid;
1586 ngid = attr->ia_gid;
1588 if (!(attr->ia_valid & ATTR_UID) || ouid == nuid)
1589 ouid = nuid = NO_QUOTA_CHANGE;
1590 if (!(attr->ia_valid & ATTR_GID) || ogid == ngid)
1591 ogid = ngid = NO_QUOTA_CHANGE;
1593 if (!gfs2_qadata_get(ip))
1596 error = gfs2_quota_lock(ip, nuid, ngid);
1600 if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) {
1601 error = gfs2_quota_check(ip, nuid, ngid);
1606 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
1610 error = gfs2_setattr_simple(inode, attr);
1614 if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) {
1615 u64 blocks = gfs2_get_inode_blocks(&ip->i_inode);
1616 gfs2_quota_change(ip, -blocks, ouid, ogid);
1617 gfs2_quota_change(ip, blocks, nuid, ngid);
1621 gfs2_trans_end(sdp);
1623 gfs2_quota_unlock(ip);
1625 gfs2_qadata_put(ip);
1630 * gfs2_setattr - Change attributes on an inode
1631 * @dentry: The dentry which is changing
1632 * @attr: The structure describing the change
1634 * The VFS layer wants to change one or more of an inodes attributes. Write
1635 * that change out to disk.
1640 static int gfs2_setattr(struct dentry *dentry, struct iattr *attr)
1642 struct inode *inode = dentry->d_inode;
1643 struct gfs2_inode *ip = GFS2_I(inode);
1644 struct gfs2_holder i_gh;
1647 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1652 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1655 error = inode_change_ok(inode, attr);
1659 if (attr->ia_valid & ATTR_SIZE)
1660 error = gfs2_setattr_size(inode, attr->ia_size);
1661 else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
1662 error = setattr_chown(inode, attr);
1663 else if ((attr->ia_valid & ATTR_MODE) && IS_POSIXACL(inode))
1664 error = gfs2_acl_chmod(ip, attr);
1666 error = gfs2_setattr_simple(inode, attr);
1670 mark_inode_dirty(inode);
1671 gfs2_glock_dq_uninit(&i_gh);
1676 * gfs2_getattr - Read out an inode's attributes
1677 * @mnt: The vfsmount the inode is being accessed from
1678 * @dentry: The dentry to stat
1679 * @stat: The inode's stats
1681 * This may be called from the VFS directly, or from within GFS2 with the
1682 * inode locked, so we look to see if the glock is already locked and only
1683 * lock the glock if its not already been done. Note that its the NFS
1684 * readdirplus operation which causes this to be called (from filldir)
1685 * with the glock already held.
1690 static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry,
1693 struct inode *inode = dentry->d_inode;
1694 struct gfs2_inode *ip = GFS2_I(inode);
1695 struct gfs2_holder gh;
1699 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1700 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1706 generic_fillattr(inode, stat);
1708 gfs2_glock_dq_uninit(&gh);
1713 static int gfs2_setxattr(struct dentry *dentry, const char *name,
1714 const void *data, size_t size, int flags)
1716 struct inode *inode = dentry->d_inode;
1717 struct gfs2_inode *ip = GFS2_I(inode);
1718 struct gfs2_holder gh;
1721 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1722 ret = gfs2_glock_nq(&gh);
1724 ret = generic_setxattr(dentry, name, data, size, flags);
1727 gfs2_holder_uninit(&gh);
1731 static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name,
1732 void *data, size_t size)
1734 struct inode *inode = dentry->d_inode;
1735 struct gfs2_inode *ip = GFS2_I(inode);
1736 struct gfs2_holder gh;
1739 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1740 ret = gfs2_glock_nq(&gh);
1742 ret = generic_getxattr(dentry, name, data, size);
1745 gfs2_holder_uninit(&gh);
1749 static int gfs2_removexattr(struct dentry *dentry, const char *name)
1751 struct inode *inode = dentry->d_inode;
1752 struct gfs2_inode *ip = GFS2_I(inode);
1753 struct gfs2_holder gh;
1756 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1757 ret = gfs2_glock_nq(&gh);
1759 ret = generic_removexattr(dentry, name);
1762 gfs2_holder_uninit(&gh);
1766 static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1769 struct gfs2_inode *ip = GFS2_I(inode);
1770 struct gfs2_holder gh;
1773 ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
1777 mutex_lock(&inode->i_mutex);
1779 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
1783 if (gfs2_is_stuffed(ip)) {
1784 u64 phys = ip->i_no_addr << inode->i_blkbits;
1785 u64 size = i_size_read(inode);
1786 u32 flags = FIEMAP_EXTENT_LAST|FIEMAP_EXTENT_NOT_ALIGNED|
1787 FIEMAP_EXTENT_DATA_INLINE;
1788 phys += sizeof(struct gfs2_dinode);
1790 if (start + len > size)
1793 ret = fiemap_fill_next_extent(fieinfo, start, phys,
1798 ret = __generic_block_fiemap(inode, fieinfo, start, len,
1802 gfs2_glock_dq_uninit(&gh);
1804 mutex_unlock(&inode->i_mutex);
1808 const struct inode_operations gfs2_file_iops = {
1809 .permission = gfs2_permission,
1810 .setattr = gfs2_setattr,
1811 .getattr = gfs2_getattr,
1812 .setxattr = gfs2_setxattr,
1813 .getxattr = gfs2_getxattr,
1814 .listxattr = gfs2_listxattr,
1815 .removexattr = gfs2_removexattr,
1816 .fiemap = gfs2_fiemap,
1817 .get_acl = gfs2_get_acl,
1820 const struct inode_operations gfs2_dir_iops = {
1821 .create = gfs2_create,
1822 .lookup = gfs2_lookup,
1824 .unlink = gfs2_unlink,
1825 .symlink = gfs2_symlink,
1826 .mkdir = gfs2_mkdir,
1827 .rmdir = gfs2_unlink,
1828 .mknod = gfs2_mknod,
1829 .rename = gfs2_rename,
1830 .permission = gfs2_permission,
1831 .setattr = gfs2_setattr,
1832 .getattr = gfs2_getattr,
1833 .setxattr = gfs2_setxattr,
1834 .getxattr = gfs2_getxattr,
1835 .listxattr = gfs2_listxattr,
1836 .removexattr = gfs2_removexattr,
1837 .fiemap = gfs2_fiemap,
1838 .get_acl = gfs2_get_acl,
1841 const struct inode_operations gfs2_symlink_iops = {
1842 .readlink = generic_readlink,
1843 .follow_link = gfs2_follow_link,
1844 .put_link = gfs2_put_link,
1845 .permission = gfs2_permission,
1846 .setattr = gfs2_setattr,
1847 .getattr = gfs2_getattr,
1848 .setxattr = gfs2_setxattr,
1849 .getxattr = gfs2_getxattr,
1850 .listxattr = gfs2_listxattr,
1851 .removexattr = gfs2_removexattr,
1852 .fiemap = gfs2_fiemap,
1853 .get_acl = gfs2_get_acl,