~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/fs/nfs/nfs3acl.c

Version: ~ [ linux-5.8 ] ~ [ linux-5.7.14 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.57 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.138 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.193 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.232 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.232 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.85 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 #include <linux/fs.h>
  2 #include <linux/gfp.h>
  3 #include <linux/nfs.h>
  4 #include <linux/nfs3.h>
  5 #include <linux/nfs_fs.h>
  6 #include <linux/posix_acl_xattr.h>
  7 #include <linux/nfsacl.h>
  8 
  9 #include "internal.h"
 10 #include "nfs3_fs.h"
 11 
 12 #define NFSDBG_FACILITY NFSDBG_PROC
 13 
 14 /*
 15  * nfs3_prepare_get_acl, nfs3_complete_get_acl, nfs3_abort_get_acl: Helpers for
 16  * caching get_acl results in a race-free way.  See fs/posix_acl.c:get_acl()
 17  * for explanations.
 18  */
 19 static void nfs3_prepare_get_acl(struct posix_acl **p)
 20 {
 21         struct posix_acl *sentinel = uncached_acl_sentinel(current);
 22 
 23         if (cmpxchg(p, ACL_NOT_CACHED, sentinel) != ACL_NOT_CACHED) {
 24                 /* Not the first reader or sentinel already in place. */
 25         }
 26 }
 27 
 28 static void nfs3_complete_get_acl(struct posix_acl **p, struct posix_acl *acl)
 29 {
 30         struct posix_acl *sentinel = uncached_acl_sentinel(current);
 31 
 32         /* Only cache the ACL if our sentinel is still in place. */
 33         posix_acl_dup(acl);
 34         if (cmpxchg(p, sentinel, acl) != sentinel)
 35                 posix_acl_release(acl);
 36 }
 37 
 38 static void nfs3_abort_get_acl(struct posix_acl **p)
 39 {
 40         struct posix_acl *sentinel = uncached_acl_sentinel(current);
 41 
 42         /* Remove our sentinel upon failure. */
 43         cmpxchg(p, sentinel, ACL_NOT_CACHED);
 44 }
 45 
 46 struct posix_acl *nfs3_get_acl(struct inode *inode, int type)
 47 {
 48         struct nfs_server *server = NFS_SERVER(inode);
 49         struct page *pages[NFSACL_MAXPAGES] = { };
 50         struct nfs3_getaclargs args = {
 51                 .fh = NFS_FH(inode),
 52                 /* The xdr layer may allocate pages here. */
 53                 .pages = pages,
 54         };
 55         struct nfs3_getaclres res = {
 56                 NULL,
 57         };
 58         struct rpc_message msg = {
 59                 .rpc_argp       = &args,
 60                 .rpc_resp       = &res,
 61         };
 62         int status, count;
 63 
 64         if (!nfs_server_capable(inode, NFS_CAP_ACLS))
 65                 return ERR_PTR(-EOPNOTSUPP);
 66 
 67         status = nfs_revalidate_inode(server, inode);
 68         if (status < 0)
 69                 return ERR_PTR(status);
 70 
 71         /*
 72          * Only get the access acl when explicitly requested: We don't
 73          * need it for access decisions, and only some applications use
 74          * it. Applications which request the access acl first are not
 75          * penalized from this optimization.
 76          */
 77         if (type == ACL_TYPE_ACCESS)
 78                 args.mask |= NFS_ACLCNT|NFS_ACL;
 79         if (S_ISDIR(inode->i_mode))
 80                 args.mask |= NFS_DFACLCNT|NFS_DFACL;
 81         if (args.mask == 0)
 82                 return NULL;
 83 
 84         dprintk("NFS call getacl\n");
 85         msg.rpc_proc = &server->client_acl->cl_procinfo[ACLPROC3_GETACL];
 86         res.fattr = nfs_alloc_fattr();
 87         if (res.fattr == NULL)
 88                 return ERR_PTR(-ENOMEM);
 89 
 90         if (args.mask & NFS_ACL)
 91                 nfs3_prepare_get_acl(&inode->i_acl);
 92         if (args.mask & NFS_DFACL)
 93                 nfs3_prepare_get_acl(&inode->i_default_acl);
 94 
 95         status = rpc_call_sync(server->client_acl, &msg, 0);
 96         dprintk("NFS reply getacl: %d\n", status);
 97 
 98         /* pages may have been allocated at the xdr layer. */
 99         for (count = 0; count < NFSACL_MAXPAGES && args.pages[count]; count++)
100                 __free_page(args.pages[count]);
101 
102         switch (status) {
103                 case 0:
104                         status = nfs_refresh_inode(inode, res.fattr);
105                         break;
106                 case -EPFNOSUPPORT:
107                 case -EPROTONOSUPPORT:
108                         dprintk("NFS_V3_ACL extension not supported; disabling\n");
109                         server->caps &= ~NFS_CAP_ACLS;
110                 case -ENOTSUPP:
111                         status = -EOPNOTSUPP;
112                 default:
113                         goto getout;
114         }
115         if ((args.mask & res.mask) != args.mask) {
116                 status = -EIO;
117                 goto getout;
118         }
119 
120         if (res.acl_access != NULL) {
121                 if ((posix_acl_equiv_mode(res.acl_access, NULL) == 0) ||
122                     res.acl_access->a_count == 0) {
123                         posix_acl_release(res.acl_access);
124                         res.acl_access = NULL;
125                 }
126         }
127 
128         if (res.mask & NFS_ACL)
129                 nfs3_complete_get_acl(&inode->i_acl, res.acl_access);
130         else
131                 forget_cached_acl(inode, ACL_TYPE_ACCESS);
132 
133         if (res.mask & NFS_DFACL)
134                 nfs3_complete_get_acl(&inode->i_default_acl, res.acl_default);
135         else
136                 forget_cached_acl(inode, ACL_TYPE_DEFAULT);
137 
138         nfs_free_fattr(res.fattr);
139         if (type == ACL_TYPE_ACCESS) {
140                 posix_acl_release(res.acl_default);
141                 return res.acl_access;
142         } else {
143                 posix_acl_release(res.acl_access);
144                 return res.acl_default;
145         }
146 
147 getout:
148         nfs3_abort_get_acl(&inode->i_acl);
149         nfs3_abort_get_acl(&inode->i_default_acl);
150         posix_acl_release(res.acl_access);
151         posix_acl_release(res.acl_default);
152         nfs_free_fattr(res.fattr);
153         return ERR_PTR(status);
154 }
155 
156 static int __nfs3_proc_setacls(struct inode *inode, struct posix_acl *acl,
157                 struct posix_acl *dfacl)
158 {
159         struct nfs_server *server = NFS_SERVER(inode);
160         struct nfs_fattr *fattr;
161         struct page *pages[NFSACL_MAXPAGES];
162         struct nfs3_setaclargs args = {
163                 .inode = inode,
164                 .mask = NFS_ACL,
165                 .acl_access = acl,
166                 .pages = pages,
167         };
168         struct rpc_message msg = {
169                 .rpc_argp       = &args,
170                 .rpc_resp       = &fattr,
171         };
172         int status = 0;
173 
174         if (acl == NULL && (!S_ISDIR(inode->i_mode) || dfacl == NULL))
175                 goto out;
176 
177         status = -EOPNOTSUPP;
178         if (!nfs_server_capable(inode, NFS_CAP_ACLS))
179                 goto out;
180 
181         /* We are doing this here because XDR marshalling does not
182          * return any results, it BUGs. */
183         status = -ENOSPC;
184         if (acl != NULL && acl->a_count > NFS_ACL_MAX_ENTRIES)
185                 goto out;
186         if (dfacl != NULL && dfacl->a_count > NFS_ACL_MAX_ENTRIES)
187                 goto out;
188         if (S_ISDIR(inode->i_mode)) {
189                 args.mask |= NFS_DFACL;
190                 args.acl_default = dfacl;
191                 args.len = nfsacl_size(acl, dfacl);
192         } else
193                 args.len = nfsacl_size(acl, NULL);
194 
195         if (args.len > NFS_ACL_INLINE_BUFSIZE) {
196                 unsigned int npages = 1 + ((args.len - 1) >> PAGE_SHIFT);
197 
198                 status = -ENOMEM;
199                 do {
200                         args.pages[args.npages] = alloc_page(GFP_KERNEL);
201                         if (args.pages[args.npages] == NULL)
202                                 goto out_freepages;
203                         args.npages++;
204                 } while (args.npages < npages);
205         }
206 
207         dprintk("NFS call setacl\n");
208         status = -ENOMEM;
209         fattr = nfs_alloc_fattr();
210         if (fattr == NULL)
211                 goto out_freepages;
212 
213         msg.rpc_proc = &server->client_acl->cl_procinfo[ACLPROC3_SETACL];
214         msg.rpc_resp = fattr;
215         status = rpc_call_sync(server->client_acl, &msg, 0);
216         nfs_access_zap_cache(inode);
217         nfs_zap_acl_cache(inode);
218         dprintk("NFS reply setacl: %d\n", status);
219 
220         switch (status) {
221                 case 0:
222                         status = nfs_refresh_inode(inode, fattr);
223                         set_cached_acl(inode, ACL_TYPE_ACCESS, acl);
224                         set_cached_acl(inode, ACL_TYPE_DEFAULT, dfacl);
225                         break;
226                 case -EPFNOSUPPORT:
227                 case -EPROTONOSUPPORT:
228                         dprintk("NFS_V3_ACL SETACL RPC not supported"
229                                         "(will not retry)\n");
230                         server->caps &= ~NFS_CAP_ACLS;
231                 case -ENOTSUPP:
232                         status = -EOPNOTSUPP;
233         }
234         nfs_free_fattr(fattr);
235 out_freepages:
236         while (args.npages != 0) {
237                 args.npages--;
238                 __free_page(args.pages[args.npages]);
239         }
240 out:
241         return status;
242 }
243 
244 int nfs3_proc_setacls(struct inode *inode, struct posix_acl *acl,
245                 struct posix_acl *dfacl)
246 {
247         int ret;
248         ret = __nfs3_proc_setacls(inode, acl, dfacl);
249         return (ret == -EOPNOTSUPP) ? 0 : ret;
250 
251 }
252 
253 int nfs3_set_acl(struct inode *inode, struct posix_acl *acl, int type)
254 {
255         struct posix_acl *alloc = NULL, *dfacl = NULL;
256         int status;
257 
258         if (S_ISDIR(inode->i_mode)) {
259                 switch(type) {
260                 case ACL_TYPE_ACCESS:
261                         alloc = dfacl = get_acl(inode, ACL_TYPE_DEFAULT);
262                         if (IS_ERR(alloc))
263                                 goto fail;
264                         break;
265 
266                 case ACL_TYPE_DEFAULT:
267                         dfacl = acl;
268                         alloc = acl = get_acl(inode, ACL_TYPE_ACCESS);
269                         if (IS_ERR(alloc))
270                                 goto fail;
271                         break;
272                 }
273         }
274 
275         if (acl == NULL) {
276                 alloc = acl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL);
277                 if (IS_ERR(alloc))
278                         goto fail;
279         }
280         status = __nfs3_proc_setacls(inode, acl, dfacl);
281         posix_acl_release(alloc);
282         return status;
283 
284 fail:
285         return PTR_ERR(alloc);
286 }
287 
288 const struct xattr_handler *nfs3_xattr_handlers[] = {
289         &posix_acl_access_xattr_handler,
290         &posix_acl_default_xattr_handler,
291         NULL,
292 };
293 
294 static int
295 nfs3_list_one_acl(struct inode *inode, int type, const char *name, void *data,
296                 size_t size, ssize_t *result)
297 {
298         struct posix_acl *acl;
299         char *p = data + *result;
300 
301         acl = get_acl(inode, type);
302         if (IS_ERR_OR_NULL(acl))
303                 return 0;
304 
305         posix_acl_release(acl);
306 
307         *result += strlen(name);
308         *result += 1;
309         if (!size)
310                 return 0;
311         if (*result > size)
312                 return -ERANGE;
313 
314         strcpy(p, name);
315         return 0;
316 }
317 
318 ssize_t
319 nfs3_listxattr(struct dentry *dentry, char *data, size_t size)
320 {
321         struct inode *inode = d_inode(dentry);
322         ssize_t result = 0;
323         int error;
324 
325         error = nfs3_list_one_acl(inode, ACL_TYPE_ACCESS,
326                         XATTR_NAME_POSIX_ACL_ACCESS, data, size, &result);
327         if (error)
328                 return error;
329 
330         error = nfs3_list_one_acl(inode, ACL_TYPE_DEFAULT,
331                         XATTR_NAME_POSIX_ACL_DEFAULT, data, size, &result);
332         if (error)
333                 return error;
334         return result;
335 }
336 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp