aboutsummaryrefslogtreecommitdiffstats
path: root/fs/xfs/linux-2.6/xfs_acl.c
diff options
context:
space:
mode:
Diffstat (limited to 'fs/xfs/linux-2.6/xfs_acl.c')
-rw-r--r--fs/xfs/linux-2.6/xfs_acl.c73
1 files changed, 9 insertions, 64 deletions
diff --git a/fs/xfs/linux-2.6/xfs_acl.c b/fs/xfs/linux-2.6/xfs_acl.c
index 1e9d1246eebc..b23a54506446 100644
--- a/fs/xfs/linux-2.6/xfs_acl.c
+++ b/fs/xfs/linux-2.6/xfs_acl.c
@@ -25,14 +25,10 @@
25#include <linux/posix_acl_xattr.h> 25#include <linux/posix_acl_xattr.h>
26 26
27 27
28#define XFS_ACL_NOT_CACHED ((void *)-1)
29
30/* 28/*
31 * Locking scheme: 29 * Locking scheme:
32 * - all ACL updates are protected by inode->i_mutex, which is taken before 30 * - all ACL updates are protected by inode->i_mutex, which is taken before
33 * calling into this file. 31 * calling into this file.
34 * - access and updates to the ip->i_acl and ip->i_default_acl pointers are
35 * protected by inode->i_lock.
36 */ 32 */
37 33
38STATIC struct posix_acl * 34STATIC struct posix_acl *
@@ -102,59 +98,35 @@ xfs_acl_to_disk(struct xfs_acl *aclp, const struct posix_acl *acl)
102 } 98 }
103} 99}
104 100
105/*
106 * Update the cached ACL pointer in the inode.
107 *
108 * Because we don't hold any locks while reading/writing the attribute
109 * from/to disk another thread could have raced and updated the cached
110 * ACL value before us. In that case we release the previous cached value
111 * and update it with our new value.
112 */
113STATIC void
114xfs_update_cached_acl(struct inode *inode, struct posix_acl **p_acl,
115 struct posix_acl *acl)
116{
117 spin_lock(&inode->i_lock);
118 if (*p_acl && *p_acl != XFS_ACL_NOT_CACHED)
119 posix_acl_release(*p_acl);
120 *p_acl = posix_acl_dup(acl);
121 spin_unlock(&inode->i_lock);
122}
123
124struct posix_acl * 101struct posix_acl *
125xfs_get_acl(struct inode *inode, int type) 102xfs_get_acl(struct inode *inode, int type)
126{ 103{
127 struct xfs_inode *ip = XFS_I(inode); 104 struct xfs_inode *ip = XFS_I(inode);
128 struct posix_acl *acl = NULL, **p_acl; 105 struct posix_acl *acl;
129 struct xfs_acl *xfs_acl; 106 struct xfs_acl *xfs_acl;
130 int len = sizeof(struct xfs_acl); 107 int len = sizeof(struct xfs_acl);
131 char *ea_name; 108 char *ea_name;
132 int error; 109 int error;
133 110
111 acl = get_cached_acl(inode, type);
112 if (acl != ACL_NOT_CACHED)
113 return acl;
114
134 switch (type) { 115 switch (type) {
135 case ACL_TYPE_ACCESS: 116 case ACL_TYPE_ACCESS:
136 ea_name = SGI_ACL_FILE; 117 ea_name = SGI_ACL_FILE;
137 p_acl = &ip->i_acl;
138 break; 118 break;
139 case ACL_TYPE_DEFAULT: 119 case ACL_TYPE_DEFAULT:
140 ea_name = SGI_ACL_DEFAULT; 120 ea_name = SGI_ACL_DEFAULT;
141 p_acl = &ip->i_default_acl;
142 break; 121 break;
143 default: 122 default:
144 return ERR_PTR(-EINVAL); 123 BUG();
145 } 124 }
146 125
147 spin_lock(&inode->i_lock);
148 if (*p_acl != XFS_ACL_NOT_CACHED)
149 acl = posix_acl_dup(*p_acl);
150 spin_unlock(&inode->i_lock);
151
152 /* 126 /*
153 * If we have a cached ACLs value just return it, not need to 127 * If we have a cached ACLs value just return it, not need to
154 * go out to the disk. 128 * go out to the disk.
155 */ 129 */
156 if (acl)
157 return acl;
158 130
159 xfs_acl = kzalloc(sizeof(struct xfs_acl), GFP_KERNEL); 131 xfs_acl = kzalloc(sizeof(struct xfs_acl), GFP_KERNEL);
160 if (!xfs_acl) 132 if (!xfs_acl)
@@ -165,7 +137,7 @@ xfs_get_acl(struct inode *inode, int type)
165 /* 137 /*
166 * If the attribute doesn't exist make sure we have a negative 138 * If the attribute doesn't exist make sure we have a negative
167 * cache entry, for any other error assume it is transient and 139 * cache entry, for any other error assume it is transient and
168 * leave the cache entry as XFS_ACL_NOT_CACHED. 140 * leave the cache entry as ACL_NOT_CACHED.
169 */ 141 */
170 if (error == -ENOATTR) { 142 if (error == -ENOATTR) {
171 acl = NULL; 143 acl = NULL;
@@ -179,7 +151,7 @@ xfs_get_acl(struct inode *inode, int type)
179 goto out; 151 goto out;
180 152
181 out_update_cache: 153 out_update_cache:
182 xfs_update_cached_acl(inode, p_acl, acl); 154 set_cached_acl(inode, type, acl);
183 out: 155 out:
184 kfree(xfs_acl); 156 kfree(xfs_acl);
185 return acl; 157 return acl;
@@ -189,7 +161,6 @@ STATIC int
189xfs_set_acl(struct inode *inode, int type, struct posix_acl *acl) 161xfs_set_acl(struct inode *inode, int type, struct posix_acl *acl)
190{ 162{
191 struct xfs_inode *ip = XFS_I(inode); 163 struct xfs_inode *ip = XFS_I(inode);
192 struct posix_acl **p_acl;
193 char *ea_name; 164 char *ea_name;
194 int error; 165 int error;
195 166
@@ -199,13 +170,11 @@ xfs_set_acl(struct inode *inode, int type, struct posix_acl *acl)
199 switch (type) { 170 switch (type) {
200 case ACL_TYPE_ACCESS: 171 case ACL_TYPE_ACCESS:
201 ea_name = SGI_ACL_FILE; 172 ea_name = SGI_ACL_FILE;
202 p_acl = &ip->i_acl;
203 break; 173 break;
204 case ACL_TYPE_DEFAULT: 174 case ACL_TYPE_DEFAULT:
205 if (!S_ISDIR(inode->i_mode)) 175 if (!S_ISDIR(inode->i_mode))
206 return acl ? -EACCES : 0; 176 return acl ? -EACCES : 0;
207 ea_name = SGI_ACL_DEFAULT; 177 ea_name = SGI_ACL_DEFAULT;
208 p_acl = &ip->i_default_acl;
209 break; 178 break;
210 default: 179 default:
211 return -EINVAL; 180 return -EINVAL;
@@ -242,7 +211,7 @@ xfs_set_acl(struct inode *inode, int type, struct posix_acl *acl)
242 } 211 }
243 212
244 if (!error) 213 if (!error)
245 xfs_update_cached_acl(inode, p_acl, acl); 214 set_cached_acl(inode, type, acl);
246 return error; 215 return error;
247} 216}
248 217
@@ -384,30 +353,6 @@ xfs_acl_chmod(struct inode *inode)
384 return error; 353 return error;
385} 354}
386 355
387void
388xfs_inode_init_acls(struct xfs_inode *ip)
389{
390 /*
391 * No need for locking, inode is not live yet.
392 */
393 ip->i_acl = XFS_ACL_NOT_CACHED;
394 ip->i_default_acl = XFS_ACL_NOT_CACHED;
395}
396
397void
398xfs_inode_clear_acls(struct xfs_inode *ip)
399{
400 /*
401 * No need for locking here, the inode is not live anymore
402 * and just about to be freed.
403 */
404 if (ip->i_acl != XFS_ACL_NOT_CACHED)
405 posix_acl_release(ip->i_acl);
406 if (ip->i_default_acl != XFS_ACL_NOT_CACHED)
407 posix_acl_release(ip->i_default_acl);
408}
409
410
411/* 356/*
412 * System xattr handlers. 357 * System xattr handlers.
413 * 358 *