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/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 <asm/uaccess.h>
39 * gfs2_create - Create a file
40 * @dir: The directory in which to create the file
41 * @dentry: The dentry of the new file
42 * @mode: The mode of the new file
47 static int gfs2_create(struct inode *dir, struct dentry *dentry,
48 int mode, struct nameidata *nd)
50 struct gfs2_inode *dip = GFS2_I(dir);
51 struct gfs2_sbd *sdp = GFS2_SB(dir);
52 struct gfs2_holder ghs[2];
55 gfs2_holder_init(dip->i_gl, 0, 0, ghs);
58 inode = gfs2_createi(ghs, &dentry->d_name, S_IFREG | mode, 0);
61 if (dip->i_alloc->al_rgd)
62 gfs2_inplace_release(dip);
63 gfs2_quota_unlock(dip);
65 gfs2_glock_dq_uninit_m(2, ghs);
66 mark_inode_dirty(inode);
68 } else if (PTR_ERR(inode) != -EEXIST ||
69 (nd && nd->flags & LOOKUP_EXCL)) {
70 gfs2_holder_uninit(ghs);
71 return PTR_ERR(inode);
74 inode = gfs2_lookupi(dir, &dentry->d_name, 0);
77 gfs2_holder_uninit(ghs);
80 gfs2_holder_uninit(ghs);
81 return PTR_ERR(inode);
86 d_instantiate(dentry, inode);
92 * gfs2_lookup - Look up a filename in a directory and return its inode
93 * @dir: The directory inode
94 * @dentry: The dentry of the new inode
95 * @nd: passed from Linux VFS, ignored by us
97 * Called by the VFS layer. Lock dir and call gfs2_lookupi()
102 static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
103 struct nameidata *nd)
105 struct inode *inode = NULL;
107 dentry->d_op = &gfs2_dops;
109 inode = gfs2_lookupi(dir, &dentry->d_name, 0);
110 if (inode && IS_ERR(inode))
111 return ERR_CAST(inode);
114 struct gfs2_glock *gl = GFS2_I(inode)->i_gl;
115 struct gfs2_holder gh;
117 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
120 return ERR_PTR(error);
122 gfs2_glock_dq_uninit(&gh);
123 return d_splice_alias(inode, dentry);
125 d_add(dentry, inode);
131 * gfs2_link - Link to a file
132 * @old_dentry: The inode to link
133 * @dir: Add link to this directory
134 * @dentry: The name of the link
136 * Link the inode in "old_dentry" into the directory "dir" with the
142 static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
143 struct dentry *dentry)
145 struct gfs2_inode *dip = GFS2_I(dir);
146 struct gfs2_sbd *sdp = GFS2_SB(dir);
147 struct inode *inode = old_dentry->d_inode;
148 struct gfs2_inode *ip = GFS2_I(inode);
149 struct gfs2_holder ghs[2];
153 if (S_ISDIR(inode->i_mode))
156 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
157 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
159 error = gfs2_glock_nq(ghs); /* parent */
163 error = gfs2_glock_nq(ghs + 1); /* child */
167 error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC);
171 error = gfs2_dir_check(dir, &dentry->d_name, NULL);
182 if (!dip->i_inode.i_nlink)
185 if (dip->i_entries == (u32)-1)
188 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
191 if (!ip->i_inode.i_nlink)
194 if (ip->i_inode.i_nlink == (u32)-1)
197 alloc_required = error = gfs2_diradd_alloc_required(dir, &dentry->d_name);
202 if (alloc_required) {
203 struct gfs2_alloc *al = gfs2_alloc_get(dip);
209 error = gfs2_quota_lock_check(dip);
213 al->al_requested = sdp->sd_max_dirres;
215 error = gfs2_inplace_reserve(dip);
219 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
220 al->al_rgd->rd_length +
221 2 * RES_DINODE + RES_STATFS +
226 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
231 error = gfs2_dir_add(dir, &dentry->d_name, ip, IF2DT(inode->i_mode));
235 error = gfs2_change_nlink(ip, +1);
241 gfs2_inplace_release(dip);
244 gfs2_quota_unlock(dip);
249 gfs2_glock_dq(ghs + 1);
253 gfs2_holder_uninit(ghs);
254 gfs2_holder_uninit(ghs + 1);
256 atomic_inc(&inode->i_count);
257 d_instantiate(dentry, inode);
258 mark_inode_dirty(inode);
264 * gfs2_unlink_ok - check to see that a inode is still in a directory
265 * @dip: the directory
266 * @name: the name of the file
269 * Assumes that the lock on (at least) @dip is held.
271 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
274 static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
275 const struct gfs2_inode *ip)
279 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
282 if ((dip->i_inode.i_mode & S_ISVTX) &&
283 dip->i_inode.i_uid != current_fsuid() &&
284 ip->i_inode.i_uid != current_fsuid() && !capable(CAP_FOWNER))
287 if (IS_APPEND(&dip->i_inode))
290 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
294 error = gfs2_dir_check(&dip->i_inode, name, ip);
302 * gfs2_unlink - Unlink a file
303 * @dir: The inode of the directory containing the file to unlink
304 * @dentry: The file itself
306 * Unlink a file. Call gfs2_unlinki()
311 static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
313 struct gfs2_inode *dip = GFS2_I(dir);
314 struct gfs2_sbd *sdp = GFS2_SB(dir);
315 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
316 struct gfs2_holder ghs[3];
317 struct gfs2_rgrpd *rgd;
318 struct gfs2_holder ri_gh;
321 error = gfs2_rindex_hold(sdp, &ri_gh);
325 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
326 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
328 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr);
329 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
332 error = gfs2_glock_nq(ghs); /* parent */
336 error = gfs2_glock_nq(ghs + 1); /* child */
340 error = gfs2_glock_nq(ghs + 2); /* rgrp */
344 error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
348 error = gfs2_trans_begin(sdp, 2*RES_DINODE + RES_LEAF + RES_RG_BIT, 0);
352 error = gfs2_dir_del(dip, &dentry->d_name);
356 error = gfs2_change_nlink(ip, -1);
361 gfs2_glock_dq(ghs + 2);
363 gfs2_holder_uninit(ghs + 2);
364 gfs2_glock_dq(ghs + 1);
366 gfs2_holder_uninit(ghs + 1);
369 gfs2_holder_uninit(ghs);
370 gfs2_glock_dq_uninit(&ri_gh);
375 * gfs2_symlink - Create a symlink
376 * @dir: The directory to create the symlink in
377 * @dentry: The dentry to put the symlink in
378 * @symname: The thing which the link points to
383 static int gfs2_symlink(struct inode *dir, struct dentry *dentry,
386 struct gfs2_inode *dip = GFS2_I(dir), *ip;
387 struct gfs2_sbd *sdp = GFS2_SB(dir);
388 struct gfs2_holder ghs[2];
390 struct buffer_head *dibh;
394 /* Must be stuffed with a null terminator for gfs2_follow_link() */
395 size = strlen(symname);
396 if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1)
397 return -ENAMETOOLONG;
399 gfs2_holder_init(dip->i_gl, 0, 0, ghs);
401 inode = gfs2_createi(ghs, &dentry->d_name, S_IFLNK | S_IRWXUGO, 0);
403 gfs2_holder_uninit(ghs);
404 return PTR_ERR(inode);
407 ip = ghs[1].gh_gl->gl_object;
409 ip->i_disksize = size;
410 i_size_write(inode, size);
412 error = gfs2_meta_inode_buffer(ip, &dibh);
414 if (!gfs2_assert_withdraw(sdp, !error)) {
415 gfs2_dinode_out(ip, dibh->b_data);
416 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname,
422 if (dip->i_alloc->al_rgd)
423 gfs2_inplace_release(dip);
424 gfs2_quota_unlock(dip);
427 gfs2_glock_dq_uninit_m(2, ghs);
429 d_instantiate(dentry, inode);
430 mark_inode_dirty(inode);
436 * gfs2_mkdir - Make a directory
437 * @dir: The parent directory of the new one
438 * @dentry: The dentry of the new directory
439 * @mode: The mode of the new directory
444 static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, int mode)
446 struct gfs2_inode *dip = GFS2_I(dir), *ip;
447 struct gfs2_sbd *sdp = GFS2_SB(dir);
448 struct gfs2_holder ghs[2];
450 struct buffer_head *dibh;
453 gfs2_holder_init(dip->i_gl, 0, 0, ghs);
455 inode = gfs2_createi(ghs, &dentry->d_name, S_IFDIR | mode, 0);
457 gfs2_holder_uninit(ghs);
458 return PTR_ERR(inode);
461 ip = ghs[1].gh_gl->gl_object;
463 ip->i_inode.i_nlink = 2;
464 ip->i_disksize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode);
465 ip->i_diskflags |= GFS2_DIF_JDATA;
468 error = gfs2_meta_inode_buffer(ip, &dibh);
470 if (!gfs2_assert_withdraw(sdp, !error)) {
471 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
472 struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1);
475 gfs2_str2qstr(&str, ".");
476 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
477 gfs2_qstr2dirent(&str, GFS2_DIRENT_SIZE(str.len), dent);
478 dent->de_inum = di->di_num; /* already GFS2 endian */
479 dent->de_type = cpu_to_be16(DT_DIR);
480 di->di_entries = cpu_to_be32(1);
482 gfs2_str2qstr(&str, "..");
483 dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1));
484 gfs2_qstr2dirent(&str, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent);
486 gfs2_inum_out(dip, dent);
487 dent->de_type = cpu_to_be16(DT_DIR);
489 gfs2_dinode_out(ip, di);
494 error = gfs2_change_nlink(dip, +1);
495 gfs2_assert_withdraw(sdp, !error); /* dip already pinned */
498 if (dip->i_alloc->al_rgd)
499 gfs2_inplace_release(dip);
500 gfs2_quota_unlock(dip);
503 gfs2_glock_dq_uninit_m(2, ghs);
505 d_instantiate(dentry, inode);
506 mark_inode_dirty(inode);
512 * gfs2_rmdiri - Remove a directory
513 * @dip: The parent directory of the directory to be removed
514 * @name: The name of the directory to be removed
515 * @ip: The GFS2 inode of the directory to be removed
517 * Assumes Glocks on dip and ip are held
522 static int gfs2_rmdiri(struct gfs2_inode *dip, const struct qstr *name,
523 struct gfs2_inode *ip)
528 if (ip->i_entries != 2) {
529 if (gfs2_consist_inode(ip))
530 gfs2_dinode_print(ip);
534 error = gfs2_dir_del(dip, name);
538 error = gfs2_change_nlink(dip, -1);
542 gfs2_str2qstr(&dotname, ".");
543 error = gfs2_dir_del(ip, &dotname);
547 gfs2_str2qstr(&dotname, "..");
548 error = gfs2_dir_del(ip, &dotname);
552 /* It looks odd, but it really should be done twice */
553 error = gfs2_change_nlink(ip, -1);
557 error = gfs2_change_nlink(ip, -1);
565 * gfs2_rmdir - Remove a directory
566 * @dir: The parent directory of the directory to be removed
567 * @dentry: The dentry of the directory to remove
569 * Remove a directory. Call gfs2_rmdiri()
574 static int gfs2_rmdir(struct inode *dir, struct dentry *dentry)
576 struct gfs2_inode *dip = GFS2_I(dir);
577 struct gfs2_sbd *sdp = GFS2_SB(dir);
578 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
579 struct gfs2_holder ghs[3];
580 struct gfs2_rgrpd *rgd;
581 struct gfs2_holder ri_gh;
584 error = gfs2_rindex_hold(sdp, &ri_gh);
587 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
588 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
590 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr);
591 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
593 error = gfs2_glock_nq(ghs); /* parent */
597 error = gfs2_glock_nq(ghs + 1); /* child */
601 error = gfs2_glock_nq(ghs + 2); /* rgrp */
605 error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
609 if (ip->i_entries < 2) {
610 if (gfs2_consist_inode(ip))
611 gfs2_dinode_print(ip);
615 if (ip->i_entries > 2) {
620 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + 3 * RES_LEAF + RES_RG_BIT, 0);
624 error = gfs2_rmdiri(dip, &dentry->d_name, ip);
629 gfs2_glock_dq(ghs + 2);
631 gfs2_holder_uninit(ghs + 2);
632 gfs2_glock_dq(ghs + 1);
634 gfs2_holder_uninit(ghs + 1);
637 gfs2_holder_uninit(ghs);
638 gfs2_glock_dq_uninit(&ri_gh);
643 * gfs2_mknod - Make a special file
644 * @dir: The directory in which the special file will reside
645 * @dentry: The dentry of the special file
646 * @mode: The mode of the special file
647 * @rdev: The device specification of the special file
651 static int gfs2_mknod(struct inode *dir, struct dentry *dentry, int mode,
654 struct gfs2_inode *dip = GFS2_I(dir);
655 struct gfs2_sbd *sdp = GFS2_SB(dir);
656 struct gfs2_holder ghs[2];
659 gfs2_holder_init(dip->i_gl, 0, 0, ghs);
661 inode = gfs2_createi(ghs, &dentry->d_name, mode, dev);
663 gfs2_holder_uninit(ghs);
664 return PTR_ERR(inode);
668 if (dip->i_alloc->al_rgd)
669 gfs2_inplace_release(dip);
670 gfs2_quota_unlock(dip);
673 gfs2_glock_dq_uninit_m(2, ghs);
675 d_instantiate(dentry, inode);
676 mark_inode_dirty(inode);
682 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
686 * Follow @to back to the root and make sure we don't encounter @this
687 * Assumes we already hold the rename lock.
692 static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
694 struct inode *dir = &to->i_inode;
695 struct super_block *sb = dir->i_sb;
700 gfs2_str2qstr(&dotdot, "..");
705 if (dir == &this->i_inode) {
709 if (dir == sb->s_root->d_inode) {
714 tmp = gfs2_lookupi(dir, &dotdot, 1);
716 error = PTR_ERR(tmp);
730 * gfs2_rename - Rename a file
731 * @odir: Parent directory of old file name
732 * @odentry: The old dentry of the file
733 * @ndir: Parent directory of new file name
734 * @ndentry: The new dentry of the file
739 static int gfs2_rename(struct inode *odir, struct dentry *odentry,
740 struct inode *ndir, struct dentry *ndentry)
742 struct gfs2_inode *odip = GFS2_I(odir);
743 struct gfs2_inode *ndip = GFS2_I(ndir);
744 struct gfs2_inode *ip = GFS2_I(odentry->d_inode);
745 struct gfs2_inode *nip = NULL;
746 struct gfs2_sbd *sdp = GFS2_SB(odir);
747 struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, };
748 struct gfs2_rgrpd *nrgd;
751 int alloc_required = 0;
755 if (ndentry->d_inode) {
756 nip = GFS2_I(ndentry->d_inode);
763 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
768 if (S_ISDIR(ip->i_inode.i_mode)) {
770 /* don't move a dirctory into it's subdir */
771 error = gfs2_ok_to_move(ip, ndip);
778 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
780 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
783 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
787 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
789 /* grab the resource lock for unlink flag twiddling
790 * this is the case of the target file already existing
791 * so we unlink before doing the rename
793 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr);
795 gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++);
798 for (x = 0; x < num_gh; x++) {
799 error = gfs2_glock_nq(ghs + x);
804 /* Check out the old directory */
806 error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
810 /* Check out the new directory */
813 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
817 if (S_ISDIR(nip->i_inode.i_mode)) {
818 if (nip->i_entries < 2) {
819 if (gfs2_consist_inode(nip))
820 gfs2_dinode_print(nip);
824 if (nip->i_entries > 2) {
830 error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC);
834 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL);
846 if (!ndip->i_inode.i_nlink) {
850 if (ndip->i_entries == (u32)-1) {
854 if (S_ISDIR(ip->i_inode.i_mode) &&
855 ndip->i_inode.i_nlink == (u32)-1) {
862 /* Check out the dir to be renamed */
865 error = gfs2_permission(odentry->d_inode, MAY_WRITE);
871 alloc_required = gfs2_diradd_alloc_required(ndir, &ndentry->d_name);
872 error = alloc_required;
877 if (alloc_required) {
878 struct gfs2_alloc *al = gfs2_alloc_get(ndip);
884 error = gfs2_quota_lock_check(ndip);
888 al->al_requested = sdp->sd_max_dirres;
890 error = gfs2_inplace_reserve(ndip);
894 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
895 al->al_rgd->rd_length +
896 4 * RES_DINODE + 4 * RES_LEAF +
897 RES_STATFS + RES_QUOTA + 4, 0);
901 error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
902 5 * RES_LEAF + 4, 0);
907 /* Remove the target file, if it exists */
910 if (S_ISDIR(nip->i_inode.i_mode))
911 error = gfs2_rmdiri(ndip, &ndentry->d_name, nip);
913 error = gfs2_dir_del(ndip, &ndentry->d_name);
916 error = gfs2_change_nlink(nip, -1);
924 gfs2_str2qstr(&name, "..");
926 error = gfs2_change_nlink(ndip, +1);
929 error = gfs2_change_nlink(odip, -1);
933 error = gfs2_dir_mvino(ip, &name, ndip, DT_DIR);
937 struct buffer_head *dibh;
938 error = gfs2_meta_inode_buffer(ip, &dibh);
941 ip->i_inode.i_ctime = CURRENT_TIME;
942 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
943 gfs2_dinode_out(ip, dibh->b_data);
947 error = gfs2_dir_del(odip, &odentry->d_name);
951 error = gfs2_dir_add(ndir, &ndentry->d_name, ip, IF2DT(ip->i_inode.i_mode));
959 gfs2_inplace_release(ndip);
962 gfs2_quota_unlock(ndip);
965 gfs2_alloc_put(ndip);
968 gfs2_glock_dq(ghs + x);
969 gfs2_holder_uninit(ghs + x);
973 gfs2_glock_dq_uninit(&r_gh);
979 * gfs2_follow_link - Follow a symbolic link
980 * @dentry: The dentry of the link
981 * @nd: Data that we pass to vfs_follow_link()
983 * This can handle symlinks of any size.
985 * Returns: 0 on success or error code
988 static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd)
990 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
991 struct gfs2_holder i_gh;
992 struct buffer_head *dibh;
997 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
998 error = gfs2_glock_nq(&i_gh);
1000 gfs2_holder_uninit(&i_gh);
1001 nd_set_link(nd, ERR_PTR(error));
1005 if (!ip->i_disksize) {
1006 gfs2_consist_inode(ip);
1007 buf = ERR_PTR(-EIO);
1011 error = gfs2_meta_inode_buffer(ip, &dibh);
1013 buf = ERR_PTR(error);
1017 x = ip->i_disksize + 1;
1018 buf = kmalloc(x, GFP_NOFS);
1020 buf = ERR_PTR(-ENOMEM);
1022 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), x);
1025 gfs2_glock_dq_uninit(&i_gh);
1026 nd_set_link(nd, buf);
1030 static void gfs2_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
1032 char *s = nd_get_link(nd);
1041 * @nd: passed from Linux VFS, ignored by us
1043 * This may be called from the VFS directly, or from within GFS2 with the
1044 * inode locked, so we look to see if the glock is already locked and only
1045 * lock the glock if its not already been done.
1050 int gfs2_permission(struct inode *inode, int mask)
1052 struct gfs2_inode *ip = GFS2_I(inode);
1053 struct gfs2_holder i_gh;
1057 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1058 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
1064 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
1067 error = generic_permission(inode, mask, gfs2_check_acl);
1069 gfs2_glock_dq_uninit(&i_gh);
1075 * XXX: should be changed to have proper ordering by opencoding simple_setsize
1077 static int setattr_size(struct inode *inode, struct iattr *attr)
1079 struct gfs2_inode *ip = GFS2_I(inode);
1080 struct gfs2_sbd *sdp = GFS2_SB(inode);
1083 if (attr->ia_size != ip->i_disksize) {
1084 error = gfs2_trans_begin(sdp, 0, sdp->sd_jdesc->jd_blocks);
1087 error = simple_setsize(inode, attr->ia_size);
1088 gfs2_trans_end(sdp);
1093 error = gfs2_truncatei(ip, attr->ia_size);
1094 if (error && (inode->i_size != ip->i_disksize))
1095 i_size_write(inode, ip->i_disksize);
1100 static int setattr_chown(struct inode *inode, struct iattr *attr)
1102 struct gfs2_inode *ip = GFS2_I(inode);
1103 struct gfs2_sbd *sdp = GFS2_SB(inode);
1104 struct buffer_head *dibh;
1105 u32 ouid, ogid, nuid, ngid;
1108 ouid = inode->i_uid;
1109 ogid = inode->i_gid;
1110 nuid = attr->ia_uid;
1111 ngid = attr->ia_gid;
1113 if (!(attr->ia_valid & ATTR_UID) || ouid == nuid)
1114 ouid = nuid = NO_QUOTA_CHANGE;
1115 if (!(attr->ia_valid & ATTR_GID) || ogid == ngid)
1116 ogid = ngid = NO_QUOTA_CHANGE;
1118 if (!gfs2_alloc_get(ip))
1121 error = gfs2_quota_lock(ip, nuid, ngid);
1125 if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) {
1126 error = gfs2_quota_check(ip, nuid, ngid);
1131 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
1135 error = gfs2_meta_inode_buffer(ip, &dibh);
1139 error = inode_setattr(inode, attr);
1140 gfs2_assert_warn(sdp, !error);
1142 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1143 gfs2_dinode_out(ip, dibh->b_data);
1146 if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) {
1147 u64 blocks = gfs2_get_inode_blocks(&ip->i_inode);
1148 gfs2_quota_change(ip, -blocks, ouid, ogid);
1149 gfs2_quota_change(ip, blocks, nuid, ngid);
1153 gfs2_trans_end(sdp);
1155 gfs2_quota_unlock(ip);
1162 * gfs2_setattr - Change attributes on an inode
1163 * @dentry: The dentry which is changing
1164 * @attr: The structure describing the change
1166 * The VFS layer wants to change one or more of an inodes attributes. Write
1167 * that change out to disk.
1172 static int gfs2_setattr(struct dentry *dentry, struct iattr *attr)
1174 struct inode *inode = dentry->d_inode;
1175 struct gfs2_inode *ip = GFS2_I(inode);
1176 struct gfs2_holder i_gh;
1179 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1184 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1187 error = inode_change_ok(inode, attr);
1191 if (attr->ia_valid & ATTR_SIZE)
1192 error = setattr_size(inode, attr);
1193 else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
1194 error = setattr_chown(inode, attr);
1195 else if ((attr->ia_valid & ATTR_MODE) && IS_POSIXACL(inode))
1196 error = gfs2_acl_chmod(ip, attr);
1198 error = gfs2_setattr_simple(ip, attr);
1201 gfs2_glock_dq_uninit(&i_gh);
1203 mark_inode_dirty(inode);
1208 * gfs2_getattr - Read out an inode's attributes
1209 * @mnt: The vfsmount the inode is being accessed from
1210 * @dentry: The dentry to stat
1211 * @stat: The inode's stats
1213 * This may be called from the VFS directly, or from within GFS2 with the
1214 * inode locked, so we look to see if the glock is already locked and only
1215 * lock the glock if its not already been done. Note that its the NFS
1216 * readdirplus operation which causes this to be called (from filldir)
1217 * with the glock already held.
1222 static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry,
1225 struct inode *inode = dentry->d_inode;
1226 struct gfs2_inode *ip = GFS2_I(inode);
1227 struct gfs2_holder gh;
1231 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1232 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1238 generic_fillattr(inode, stat);
1240 gfs2_glock_dq_uninit(&gh);
1245 static int gfs2_setxattr(struct dentry *dentry, const char *name,
1246 const void *data, size_t size, int flags)
1248 struct inode *inode = dentry->d_inode;
1249 struct gfs2_inode *ip = GFS2_I(inode);
1250 struct gfs2_holder gh;
1253 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1254 ret = gfs2_glock_nq(&gh);
1256 ret = generic_setxattr(dentry, name, data, size, flags);
1259 gfs2_holder_uninit(&gh);
1263 static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name,
1264 void *data, size_t size)
1266 struct inode *inode = dentry->d_inode;
1267 struct gfs2_inode *ip = GFS2_I(inode);
1268 struct gfs2_holder gh;
1271 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1272 ret = gfs2_glock_nq(&gh);
1274 ret = generic_getxattr(dentry, name, data, size);
1277 gfs2_holder_uninit(&gh);
1281 static int gfs2_removexattr(struct dentry *dentry, const char *name)
1283 struct inode *inode = dentry->d_inode;
1284 struct gfs2_inode *ip = GFS2_I(inode);
1285 struct gfs2_holder gh;
1288 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1289 ret = gfs2_glock_nq(&gh);
1291 ret = generic_removexattr(dentry, name);
1294 gfs2_holder_uninit(&gh);
1298 static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1301 struct gfs2_inode *ip = GFS2_I(inode);
1302 struct gfs2_holder gh;
1305 ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
1309 mutex_lock(&inode->i_mutex);
1311 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
1315 if (gfs2_is_stuffed(ip)) {
1316 u64 phys = ip->i_no_addr << inode->i_blkbits;
1317 u64 size = i_size_read(inode);
1318 u32 flags = FIEMAP_EXTENT_LAST|FIEMAP_EXTENT_NOT_ALIGNED|
1319 FIEMAP_EXTENT_DATA_INLINE;
1320 phys += sizeof(struct gfs2_dinode);
1322 if (start + len > size)
1325 ret = fiemap_fill_next_extent(fieinfo, start, phys,
1330 ret = __generic_block_fiemap(inode, fieinfo, start, len,
1334 gfs2_glock_dq_uninit(&gh);
1336 mutex_unlock(&inode->i_mutex);
1340 const struct inode_operations gfs2_file_iops = {
1341 .permission = gfs2_permission,
1342 .setattr = gfs2_setattr,
1343 .getattr = gfs2_getattr,
1344 .setxattr = gfs2_setxattr,
1345 .getxattr = gfs2_getxattr,
1346 .listxattr = gfs2_listxattr,
1347 .removexattr = gfs2_removexattr,
1348 .fiemap = gfs2_fiemap,
1351 const struct inode_operations gfs2_dir_iops = {
1352 .create = gfs2_create,
1353 .lookup = gfs2_lookup,
1355 .unlink = gfs2_unlink,
1356 .symlink = gfs2_symlink,
1357 .mkdir = gfs2_mkdir,
1358 .rmdir = gfs2_rmdir,
1359 .mknod = gfs2_mknod,
1360 .rename = gfs2_rename,
1361 .permission = gfs2_permission,
1362 .setattr = gfs2_setattr,
1363 .getattr = gfs2_getattr,
1364 .setxattr = gfs2_setxattr,
1365 .getxattr = gfs2_getxattr,
1366 .listxattr = gfs2_listxattr,
1367 .removexattr = gfs2_removexattr,
1368 .fiemap = gfs2_fiemap,
1371 const struct inode_operations gfs2_symlink_iops = {
1372 .readlink = generic_readlink,
1373 .follow_link = gfs2_follow_link,
1374 .put_link = gfs2_put_link,
1375 .permission = gfs2_permission,
1376 .setattr = gfs2_setattr,
1377 .getattr = gfs2_getattr,
1378 .setxattr = gfs2_setxattr,
1379 .getxattr = gfs2_getxattr,
1380 .listxattr = gfs2_listxattr,
1381 .removexattr = gfs2_removexattr,
1382 .fiemap = gfs2_fiemap,