2 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation.
9 * This program is distributed in the hope that it would be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
23 #include "xfs_trans.h"
28 #include "xfs_alloc.h"
29 #include "xfs_dmapi.h"
30 #include "xfs_quota.h"
31 #include "xfs_mount.h"
32 #include "xfs_bmap_btree.h"
33 #include "xfs_alloc_btree.h"
34 #include "xfs_ialloc_btree.h"
35 #include "xfs_dir_sf.h"
36 #include "xfs_dir2_sf.h"
37 #include "xfs_attr_sf.h"
38 #include "xfs_dinode.h"
39 #include "xfs_inode.h"
41 #include "xfs_btree.h"
42 #include "xfs_ialloc.h"
43 #include "xfs_rtalloc.h"
44 #include "xfs_error.h"
45 #include "xfs_itable.h"
51 #include "xfs_buf_item.h"
52 #include "xfs_utils.h"
54 #include <linux/capability.h>
55 #include <linux/xattr.h>
56 #include <linux/namei.h>
57 #include <linux/security.h>
60 * Get a XFS inode from a given vnode.
68 bdp = bhv_lookup_range(VN_BHV_HEAD(vp),
69 VNODE_POSITION_XFS, VNODE_POSITION_XFS);
70 if (unlikely(bdp == NULL))
72 return XFS_BHVTOI(bdp);
76 * Bring the atime in the XFS inode uptodate.
77 * Used before logging the inode to disk or when the Linux inode goes away.
80 xfs_synchronize_atime(
85 vp = XFS_ITOV_NULL(ip);
87 struct inode *inode = &vp->v_inode;
88 ip->i_d.di_atime.t_sec = (__int32_t)inode->i_atime.tv_sec;
89 ip->i_d.di_atime.t_nsec = (__int32_t)inode->i_atime.tv_nsec;
94 * Change the requested timestamp in the given inode.
95 * We don't lock across timestamp updates, and we don't log them but
96 * we do record the fact that there is dirty information in core.
98 * NOTE -- callers MUST combine XFS_ICHGTIME_MOD or XFS_ICHGTIME_CHG
99 * with XFS_ICHGTIME_ACC to be sure that access time
100 * update will take. Calling first with XFS_ICHGTIME_ACC
101 * and then XFS_ICHGTIME_MOD may fail to modify the access
102 * timestamp if the filesystem is mounted noacctm.
109 struct inode *inode = LINVFS_GET_IP(XFS_ITOV(ip));
113 if (flags & XFS_ICHGTIME_MOD) {
115 ip->i_d.di_mtime.t_sec = (__int32_t)tv.tv_sec;
116 ip->i_d.di_mtime.t_nsec = (__int32_t)tv.tv_nsec;
118 if (flags & XFS_ICHGTIME_ACC) {
120 ip->i_d.di_atime.t_sec = (__int32_t)tv.tv_sec;
121 ip->i_d.di_atime.t_nsec = (__int32_t)tv.tv_nsec;
123 if (flags & XFS_ICHGTIME_CHG) {
125 ip->i_d.di_ctime.t_sec = (__int32_t)tv.tv_sec;
126 ip->i_d.di_ctime.t_nsec = (__int32_t)tv.tv_nsec;
130 * We update the i_update_core field _after_ changing
131 * the timestamps in order to coordinate properly with
132 * xfs_iflush() so that we don't lose timestamp updates.
133 * This keeps us from having to hold the inode lock
134 * while doing this. We use the SYNCHRONIZE macro to
135 * ensure that the compiler does not reorder the update
136 * of i_update_core above the timestamp updates above.
139 ip->i_update_core = 1;
140 if (!(inode->i_state & I_LOCK))
141 mark_inode_dirty_sync(inode);
145 * Variant on the above which avoids querying the system clock
146 * in situations where we know the Linux inode timestamps have
147 * just been updated (and so we can update our inode cheaply).
158 * Atime updates for read() & friends are handled lazily now, and
159 * explicit updates must go through xfs_ichgtime()
161 ASSERT((flags & XFS_ICHGTIME_ACC) == 0);
164 * We're not supposed to change timestamps in readonly-mounted
165 * filesystems. Throw it away if anyone asks us.
167 if (unlikely(IS_RDONLY(inode)))
170 if (flags & XFS_ICHGTIME_MOD) {
171 tvp = &inode->i_mtime;
172 ip->i_d.di_mtime.t_sec = (__int32_t)tvp->tv_sec;
173 ip->i_d.di_mtime.t_nsec = (__int32_t)tvp->tv_nsec;
175 if (flags & XFS_ICHGTIME_CHG) {
176 tvp = &inode->i_ctime;
177 ip->i_d.di_ctime.t_sec = (__int32_t)tvp->tv_sec;
178 ip->i_d.di_ctime.t_nsec = (__int32_t)tvp->tv_nsec;
182 * We update the i_update_core field _after_ changing
183 * the timestamps in order to coordinate properly with
184 * xfs_iflush() so that we don't lose timestamp updates.
185 * This keeps us from having to hold the inode lock
186 * while doing this. We use the SYNCHRONIZE macro to
187 * ensure that the compiler does not reorder the update
188 * of i_update_core above the timestamp updates above.
191 ip->i_update_core = 1;
192 if (!(inode->i_state & I_LOCK))
193 mark_inode_dirty_sync(inode);
198 * Pull the link count and size up from the xfs inode to the linux inode
201 __linvfs_validate_fields(
205 vnode_t *vp = LINVFS_GET_VP(ip);
208 vattr->va_mask = XFS_AT_NLINK|XFS_AT_SIZE|XFS_AT_NBLOCKS;
209 VOP_GETATTR(vp, vattr, ATTR_LAZY, NULL, error);
210 if (likely(!error)) {
211 ip->i_nlink = vattr->va_nlink;
212 ip->i_blocks = vattr->va_nblocks;
214 /* we're under i_sem so i_size can't change under us */
215 if (i_size_read(ip) != vattr->va_size)
216 i_size_write(ip, vattr->va_size);
221 * Hook in SELinux. This is not quite correct yet, what we really need
222 * here (as we do for default ACLs) is a mechanism by which creation of
223 * these attrs can be journalled at inode creation time (along with the
224 * inode, of course, such that log replay can't cause these to be lost).
227 __linvfs_init_security(
231 struct inode *ip = LINVFS_GET_IP(vp);
237 error = security_inode_init_security(ip, dir, &name, &value, &length);
239 if (error == -EOPNOTSUPP)
244 VOP_ATTR_SET(vp, name, value, length, ATTR_SECURE, NULL, error);
254 * Determine whether a process has a valid fs_struct (kernel daemons
255 * like knfsd don't have an fs_struct).
257 * XXX(hch): nfsd is broken, better fix it instead.
260 __linvfs_has_fs_struct(struct task_struct *task)
262 return (task->fs != init_task.fs);
266 __linvfs_cleanup_inode(
269 struct dentry *dentry,
272 struct dentry teardown = {};
276 * If we can't add the ACL or we fail in
277 * linvfs_init_security we must back out.
278 * ENOSPC can hit here, among other things.
280 teardown.d_inode = LINVFS_GET_IP(vp);
281 teardown.d_name = dentry->d_name;
284 VOP_RMDIR(dvp, &teardown, NULL, error);
286 VOP_REMOVE(dvp, &teardown, NULL, error);
293 struct dentry *dentry,
299 vnode_t *vp = NULL, *dvp = LINVFS_GET_VP(dir);
300 xfs_acl_t *default_acl = NULL;
301 attrexists_t test_default_acl = _ACL_DEFAULT_EXISTS;
305 * Irix uses Missed'em'V split, but doesn't want to see
306 * the upper 5 bits of (14bit) major.
308 if (unlikely(!sysv_valid_dev(rdev) || MAJOR(rdev) & ~0x1ff))
311 vattr = kmalloc(sizeof(*vattr), GFP_KERNEL);
312 if (unlikely(!vattr))
315 if (unlikely(test_default_acl && test_default_acl(dvp))) {
316 if (!_ACL_ALLOC(default_acl)) {
320 if (!_ACL_GET_DEFAULT(dvp, default_acl)) {
321 _ACL_FREE(default_acl);
326 if (IS_POSIXACL(dir) && !default_acl && __linvfs_has_fs_struct(current))
327 mode &= ~current->fs->umask;
329 memset(vattr, 0, sizeof(*vattr));
330 vattr->va_mask = XFS_AT_TYPE|XFS_AT_MODE;
331 vattr->va_mode = mode;
333 switch (mode & S_IFMT) {
334 case S_IFCHR: case S_IFBLK: case S_IFIFO: case S_IFSOCK:
335 vattr->va_rdev = sysv_encode_dev(rdev);
336 vattr->va_mask |= XFS_AT_RDEV;
339 VOP_CREATE(dvp, dentry, vattr, &vp, NULL, error);
342 VOP_MKDIR(dvp, dentry, vattr, &vp, NULL, error);
349 if (unlikely(!error)) {
350 error = __linvfs_init_security(vp, dir);
352 __linvfs_cleanup_inode(dvp, vp, dentry, mode);
355 if (unlikely(default_acl)) {
357 error = _ACL_INHERIT(vp, vattr, default_acl);
361 __linvfs_cleanup_inode(dvp, vp, dentry, mode);
363 _ACL_FREE(default_acl);
366 if (likely(!error)) {
368 ip = LINVFS_GET_IP(vp);
370 if (S_ISCHR(mode) || S_ISBLK(mode))
372 else if (S_ISDIR(mode))
373 __linvfs_validate_fields(ip, vattr);
374 d_instantiate(dentry, ip);
375 __linvfs_validate_fields(dir, vattr);
384 struct dentry *dentry,
386 struct nameidata *nd)
388 return linvfs_mknod(dir, dentry, mode, 0);
394 struct dentry *dentry,
397 return linvfs_mknod(dir, dentry, mode|S_IFDIR, 0);
400 STATIC struct dentry *
403 struct dentry *dentry,
404 struct nameidata *nd)
406 struct vnode *vp = LINVFS_GET_VP(dir), *cvp;
409 if (dentry->d_name.len >= MAXNAMELEN)
410 return ERR_PTR(-ENAMETOOLONG);
412 VOP_LOOKUP(vp, dentry, &cvp, 0, NULL, NULL, error);
414 if (unlikely(error != ENOENT))
415 return ERR_PTR(-error);
420 return d_splice_alias(LINVFS_GET_IP(cvp), dentry);
425 struct dentry *old_dentry,
427 struct dentry *dentry)
429 struct inode *ip; /* inode of guy being linked to */
430 vnode_t *tdvp; /* target directory for new name/link */
431 vnode_t *vp; /* vp of name being linked */
435 ip = old_dentry->d_inode; /* inode being linked to */
436 if (S_ISDIR(ip->i_mode))
439 vattr = kmalloc(sizeof(*vattr), GFP_KERNEL);
440 if (unlikely(!vattr))
443 tdvp = LINVFS_GET_VP(dir);
444 vp = LINVFS_GET_VP(ip);
446 VOP_LINK(tdvp, vp, dentry, NULL, error);
447 if (likely(!error)) {
450 __linvfs_validate_fields(ip, vattr);
451 d_instantiate(dentry, ip);
460 struct dentry *dentry)
463 vnode_t *dvp; /* directory containing name to remove */
467 vattr = kmalloc(sizeof(*vattr), GFP_KERNEL);
468 if (unlikely(!vattr))
471 inode = dentry->d_inode;
472 dvp = LINVFS_GET_VP(dir);
474 VOP_REMOVE(dvp, dentry, NULL, error);
475 if (likely(!error)) {
476 __linvfs_validate_fields(dir, vattr); /* size needs update */
477 __linvfs_validate_fields(inode, vattr);
486 struct dentry *dentry,
491 vnode_t *dvp; /* directory containing name of symlink */
492 vnode_t *cvp; /* used to lookup symlink to put in dentry */
495 dvp = LINVFS_GET_VP(dir);
498 vattr = kmalloc(sizeof(*vattr), GFP_KERNEL);
499 if (unlikely(!vattr))
502 memset(vattr, 0, sizeof(*vattr));
503 vattr->va_mode = S_IFLNK |
504 (irix_symlink_mode ? 0777 & ~current->fs->umask : S_IRWXUGO);
505 vattr->va_mask = XFS_AT_TYPE|XFS_AT_MODE;
508 VOP_SYMLINK(dvp, dentry, vattr, (char *)symname, &cvp, NULL, error);
509 if (likely(!error && cvp)) {
510 error = __linvfs_init_security(cvp, dir);
511 if (likely(!error)) {
512 ip = LINVFS_GET_IP(cvp);
513 d_instantiate(dentry, ip);
514 __linvfs_validate_fields(dir, vattr);
515 __linvfs_validate_fields(ip, vattr);
525 struct dentry *dentry)
527 struct inode *inode = dentry->d_inode;
528 vnode_t *dvp = LINVFS_GET_VP(dir);
532 vattr = kmalloc(sizeof(*vattr), GFP_KERNEL);
533 if (unlikely(!vattr))
536 VOP_RMDIR(dvp, dentry, NULL, error);
537 if (likely(!error)) {
538 __linvfs_validate_fields(inode, vattr);
539 __linvfs_validate_fields(dir, vattr);
548 struct dentry *odentry,
550 struct dentry *ndentry)
552 struct inode *new_inode = ndentry->d_inode;
553 vnode_t *fvp; /* from directory */
554 vnode_t *tvp; /* target directory */
558 vattr = kmalloc(sizeof(*vattr), GFP_KERNEL);
559 if (unlikely(!vattr))
562 fvp = LINVFS_GET_VP(odir);
563 tvp = LINVFS_GET_VP(ndir);
565 VOP_RENAME(fvp, odentry, tvp, ndentry, NULL, error);
566 if (likely(!error)) {
568 __linvfs_validate_fields(new_inode, vattr);
569 __linvfs_validate_fields(odir, vattr);
571 __linvfs_validate_fields(ndir, vattr);
578 * careful here - this function can get called recursively, so
579 * we need to be very careful about how much stack we use.
580 * uio is kmalloced for this reason...
584 struct dentry *dentry,
585 struct nameidata *nd)
596 link = (char *)kmalloc(MAXPATHLEN+1, GFP_KERNEL);
598 nd_set_link(nd, ERR_PTR(-ENOMEM));
602 uio = (uio_t *)kmalloc(sizeof(uio_t), GFP_KERNEL);
605 nd_set_link(nd, ERR_PTR(-ENOMEM));
609 vp = LINVFS_GET_VP(dentry->d_inode);
612 iov.iov_len = MAXPATHLEN;
616 uio->uio_segflg = UIO_SYSSPACE;
617 uio->uio_resid = MAXPATHLEN;
620 VOP_READLINK(vp, uio, 0, NULL, error);
623 link = ERR_PTR(-error);
625 link[MAXPATHLEN - uio->uio_resid] = '\0';
629 nd_set_link(nd, link);
635 struct dentry *dentry,
636 struct nameidata *nd,
639 char *s = nd_get_link(nd);
645 #ifdef CONFIG_XFS_POSIX_ACL
650 struct nameidata *nd)
652 vnode_t *vp = LINVFS_GET_VP(inode);
655 mode <<= 6; /* convert from linux to vnode access bits */
656 VOP_ACCESS(vp, mode, NULL, error);
660 #define linvfs_permission NULL
665 struct vfsmount *mnt,
666 struct dentry *dentry,
669 struct inode *inode = dentry->d_inode;
670 vnode_t *vp = LINVFS_GET_VP(inode);
673 if (unlikely(vp->v_flag & VMODIFIED))
674 error = vn_revalidate(vp);
676 generic_fillattr(inode, stat);
682 struct dentry *dentry,
685 struct inode *inode = dentry->d_inode;
686 unsigned int ia_valid = attr->ia_valid;
687 vnode_t *vp = LINVFS_GET_VP(inode);
688 vattr_t vattr = { 0 };
692 if (ia_valid & ATTR_UID) {
693 vattr.va_mask |= XFS_AT_UID;
694 vattr.va_uid = attr->ia_uid;
696 if (ia_valid & ATTR_GID) {
697 vattr.va_mask |= XFS_AT_GID;
698 vattr.va_gid = attr->ia_gid;
700 if (ia_valid & ATTR_SIZE) {
701 vattr.va_mask |= XFS_AT_SIZE;
702 vattr.va_size = attr->ia_size;
704 if (ia_valid & ATTR_ATIME) {
705 vattr.va_mask |= XFS_AT_ATIME;
706 vattr.va_atime = attr->ia_atime;
707 if (ia_valid & ATTR_ATIME_SET)
708 inode->i_atime = attr->ia_atime;
710 if (ia_valid & ATTR_MTIME) {
711 vattr.va_mask |= XFS_AT_MTIME;
712 vattr.va_mtime = attr->ia_mtime;
714 if (ia_valid & ATTR_CTIME) {
715 vattr.va_mask |= XFS_AT_CTIME;
716 vattr.va_ctime = attr->ia_ctime;
718 if (ia_valid & ATTR_MODE) {
719 vattr.va_mask |= XFS_AT_MODE;
720 vattr.va_mode = attr->ia_mode;
721 if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID))
722 inode->i_mode &= ~S_ISGID;
725 if (ia_valid & (ATTR_MTIME_SET | ATTR_ATIME_SET))
728 if ((ia_valid & ATTR_NO_BLOCK))
729 flags |= ATTR_NONBLOCK;
732 VOP_SETATTR(vp, &vattr, flags, NULL, error);
734 __vn_revalidate(vp, &vattr);
742 block_truncate_page(inode->i_mapping, inode->i_size, xfs_get_block);
747 struct dentry *dentry,
753 vnode_t *vp = LINVFS_GET_VP(dentry->d_inode);
754 char *attr = (char *)name;
759 namesp = attr_lookup_namespace(attr, attr_namespaces, ATTR_NAMECOUNT);
762 attr += namesp->attr_namelen;
763 error = namesp->attr_capable(vp, NULL);
767 /* Convert Linux syscall to XFS internal ATTR flags */
768 if (flags & XATTR_CREATE)
769 xflags |= ATTR_CREATE;
770 if (flags & XATTR_REPLACE)
771 xflags |= ATTR_REPLACE;
772 xflags |= namesp->attr_flag;
773 return namesp->attr_set(vp, attr, (void *)data, size, xflags);
778 struct dentry *dentry,
783 vnode_t *vp = LINVFS_GET_VP(dentry->d_inode);
784 char *attr = (char *)name;
789 namesp = attr_lookup_namespace(attr, attr_namespaces, ATTR_NAMECOUNT);
792 attr += namesp->attr_namelen;
793 error = namesp->attr_capable(vp, NULL);
797 /* Convert Linux syscall to XFS internal ATTR flags */
799 xflags |= ATTR_KERNOVAL;
802 xflags |= namesp->attr_flag;
803 return namesp->attr_get(vp, attr, (void *)data, size, xflags);
808 struct dentry *dentry,
812 vnode_t *vp = LINVFS_GET_VP(dentry->d_inode);
813 int error, xflags = ATTR_KERNAMELS;
817 xflags |= ATTR_KERNOVAL;
818 xflags |= capable(CAP_SYS_ADMIN) ? ATTR_KERNFULLS : ATTR_KERNORMALS;
820 error = attr_generic_list(vp, data, size, xflags, &result);
828 struct dentry *dentry,
831 vnode_t *vp = LINVFS_GET_VP(dentry->d_inode);
832 char *attr = (char *)name;
837 namesp = attr_lookup_namespace(attr, attr_namespaces, ATTR_NAMECOUNT);
840 attr += namesp->attr_namelen;
841 error = namesp->attr_capable(vp, NULL);
844 xflags |= namesp->attr_flag;
845 return namesp->attr_remove(vp, attr, xflags);
849 struct inode_operations linvfs_file_inode_operations = {
850 .permission = linvfs_permission,
851 .truncate = linvfs_truncate,
852 .getattr = linvfs_getattr,
853 .setattr = linvfs_setattr,
854 .setxattr = linvfs_setxattr,
855 .getxattr = linvfs_getxattr,
856 .listxattr = linvfs_listxattr,
857 .removexattr = linvfs_removexattr,
860 struct inode_operations linvfs_dir_inode_operations = {
861 .create = linvfs_create,
862 .lookup = linvfs_lookup,
864 .unlink = linvfs_unlink,
865 .symlink = linvfs_symlink,
866 .mkdir = linvfs_mkdir,
867 .rmdir = linvfs_rmdir,
868 .mknod = linvfs_mknod,
869 .rename = linvfs_rename,
870 .permission = linvfs_permission,
871 .getattr = linvfs_getattr,
872 .setattr = linvfs_setattr,
873 .setxattr = linvfs_setxattr,
874 .getxattr = linvfs_getxattr,
875 .listxattr = linvfs_listxattr,
876 .removexattr = linvfs_removexattr,
879 struct inode_operations linvfs_symlink_inode_operations = {
880 .readlink = generic_readlink,
881 .follow_link = linvfs_follow_link,
882 .put_link = linvfs_put_link,
883 .permission = linvfs_permission,
884 .getattr = linvfs_getattr,
885 .setattr = linvfs_setattr,
886 .setxattr = linvfs_setxattr,
887 .getxattr = linvfs_getxattr,
888 .listxattr = linvfs_listxattr,
889 .removexattr = linvfs_removexattr,