xref: /illumos-gate/usr/src/uts/common/fs/ufs/ufs_xattr.c (revision 2d6eb4a5)
1 /*
2  * CDDL HEADER START
3  *
4  * The contents of this file are subject to the terms of the
5  * Common Development and Distribution License (the "License").
6  * You may not use this file except in compliance with the License.
7  *
8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9  * or http://www.opensolaris.org/os/licensing.
10  * See the License for the specific language governing permissions
11  * and limitations under the License.
12  *
13  * When distributing Covered Code, include this CDDL HEADER in each
14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15  * If applicable, add the following below this CDDL HEADER, with the
16  * fields enclosed by brackets "[]" replaced with your own identifying
17  * information: Portions Copyright [yyyy] [name of copyright owner]
18  *
19  * CDDL HEADER END
20  */
21 /*
22  * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
23  * Use is subject to license terms.
24  */
25 
26 #include <sys/t_lock.h>
27 #include <sys/param.h>
28 #include <sys/systm.h>
29 #include <sys/signal.h>
30 #include <sys/cred.h>
31 #include <sys/proc.h>
32 #include <sys/disp.h>
33 #include <sys/user.h>
34 #include <sys/vfs.h>
35 #include <sys/vnode.h>
36 #include <sys/stat.h>
37 #include <sys/mode.h>
38 #include <sys/buf.h>
39 #include <sys/uio.h>
40 #include <sys/dnlc.h>
41 #include <sys/pathname.h>
42 #include <sys/fs/ufs_inode.h>
43 #include <sys/fs/ufs_fs.h>
44 #include <sys/mount.h>
45 #include <sys/fs/ufs_fsdir.h>
46 #include <sys/fs/ufs_trans.h>
47 #include <sys/fs/ufs_panic.h>
48 #include <sys/fs/ufs_quota.h>
49 #include <sys/errno.h>
50 #include <sys/debug.h>
51 #include <vm/seg.h>
52 #include <sys/sysmacros.h>
53 #include <sys/cmn_err.h>
54 #include <sys/cpuvar.h>
55 #include <sys/unistd.h>
56 
57 int
ufs_xattr_getattrdir(vnode_t * dvp,struct inode ** sip,int flags,struct cred * cr)58 ufs_xattr_getattrdir(
59 	vnode_t *dvp,
60 	struct inode **sip,
61 	int flags,
62 	struct cred *cr)
63 {
64 	struct vfs	*vfsp;
65 	struct inode	*ip, *sdp;
66 	int		error;
67 
68 	ip = VTOI(dvp);
69 	if (flags & LOOKUP_XATTR) {
70 		if (ip && ((ip->i_oeftflag) != 0)) {
71 			vfsp = dvp->v_vfsp;
72 
73 			error = ufs_iget(vfsp, ip->i_oeftflag, sip, cr);
74 			if (error)
75 				return (error);
76 
77 			sdp = *sip;
78 
79 			/*
80 			 * Make sure it really is an ATTRDIR
81 			 */
82 			if ((sdp->i_mode & IFMT) != IFATTRDIR) {
83 				cmn_err(CE_NOTE, "ufs_getattrdir: inode %d"
84 				    " points to attribute directory %d "
85 				    "which is not an attribute directory;"
86 				    "run fsck on file system",
87 				    (int)ip->i_number, (int)sdp->i_number);
88 				VN_RELE(ITOV(sdp));
89 				return (ENOENT);
90 			}
91 			ITOV(sdp)->v_type = VDIR;
92 			ITOV(sdp)->v_flag |= V_XATTRDIR;
93 			error = 0;
94 			goto out;
95 		} else if (flags & CREATE_XATTR_DIR) {
96 			error = ufs_xattrmkdir(ip, sip, 1, cr);
97 		} else {
98 			error = ENOENT;
99 				goto out;
100 		}
101 
102 	} else if (flags & CREATE_XATTR_DIR) {
103 		error = ufs_xattrmkdir(ip, sip, 1, cr);
104 	} else {
105 		error = ENOENT;
106 	}
107 out:
108 	return (error);
109 }
110 
111 
112 /*
113  * Unhook an attribute directory from a parent file/dir
114  * Only do so, if we are the only user of the vnode.
115  */
116 void
ufs_unhook_shadow(struct inode * ip,struct inode * sip)117 ufs_unhook_shadow(struct inode *ip, struct inode *sip)
118 {
119 	struct vnode		*datavp = ITOV(ip);
120 	struct vnode		*dirvp = ITOV(sip);
121 	int			hno;
122 	kmutex_t		*ihm;
123 
124 	ASSERT(RW_WRITE_HELD(&sip->i_contents));
125 	ASSERT(RW_WRITE_HELD(&ip->i_contents));
126 
127 	if (vn_is_readonly(ITOV(ip)))
128 		return;
129 
130 	if (ip->i_ufsvfs == NULL || sip->i_ufsvfs == NULL)
131 		return;
132 
133 	hno = INOHASH(ip->i_number);
134 	ihm = &ih_lock[hno];
135 	mutex_enter(ihm);
136 
137 	mutex_enter(&datavp->v_lock);
138 	mutex_enter(&dirvp->v_lock);
139 
140 	if (dirvp->v_count != 1 && datavp->v_count != 1) {
141 		mutex_exit(&dirvp->v_lock);
142 		mutex_exit(&datavp->v_lock);
143 		mutex_exit(ihm);
144 		return;
145 	}
146 
147 	/*
148 	 * Delete shadow from ip
149 	 */
150 
151 	sip->i_nlink -= 2;
152 	ufs_setreclaim(sip);
153 	TRANS_INODE(sip->i_ufsvfs, sip);
154 	sip->i_flag |= ICHG;
155 	sip->i_seq++;
156 	ITIMES_NOLOCK(sip);
157 
158 	/*
159 	 * Update src file
160 	 */
161 	ip->i_oeftflag = 0;
162 	TRANS_INODE(ip->i_ufsvfs, ip);
163 	ip->i_flag |= ICHG;
164 	ip->i_seq++;
165 	ufs_iupdat(ip, 1);
166 	mutex_exit(&dirvp->v_lock);
167 	mutex_exit(&datavp->v_lock);
168 	mutex_exit(ihm);
169 }
170