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Linux/fs/nfs/nfs3acl.c

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  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 
 11 #define NFSDBG_FACILITY NFSDBG_PROC
 12 
 13 ssize_t nfs3_listxattr(struct dentry *dentry, char *buffer, size_t size)
 14 {
 15         struct inode *inode = dentry->d_inode;
 16         struct posix_acl *acl;
 17         int pos=0, len=0;
 18 
 19 #       define output(s) do {                                           \
 20                         if (pos + sizeof(s) <= size) {                  \
 21                                 memcpy(buffer + pos, s, sizeof(s));     \
 22                                 pos += sizeof(s);                       \
 23                         }                                               \
 24                         len += sizeof(s);                               \
 25                 } while(0)
 26 
 27         acl = nfs3_proc_getacl(inode, ACL_TYPE_ACCESS);
 28         if (IS_ERR(acl))
 29                 return PTR_ERR(acl);
 30         if (acl) {
 31                 output("system.posix_acl_access");
 32                 posix_acl_release(acl);
 33         }
 34 
 35         if (S_ISDIR(inode->i_mode)) {
 36                 acl = nfs3_proc_getacl(inode, ACL_TYPE_DEFAULT);
 37                 if (IS_ERR(acl))
 38                         return PTR_ERR(acl);
 39                 if (acl) {
 40                         output("system.posix_acl_default");
 41                         posix_acl_release(acl);
 42                 }
 43         }
 44 
 45 #       undef output
 46 
 47         if (!buffer || len <= size)
 48                 return len;
 49         return -ERANGE;
 50 }
 51 
 52 ssize_t nfs3_getxattr(struct dentry *dentry, const char *name,
 53                 void *buffer, size_t size)
 54 {
 55         struct inode *inode = dentry->d_inode;
 56         struct posix_acl *acl;
 57         int type, error = 0;
 58 
 59         if (strcmp(name, POSIX_ACL_XATTR_ACCESS) == 0)
 60                 type = ACL_TYPE_ACCESS;
 61         else if (strcmp(name, POSIX_ACL_XATTR_DEFAULT) == 0)
 62                 type = ACL_TYPE_DEFAULT;
 63         else
 64                 return -EOPNOTSUPP;
 65 
 66         acl = nfs3_proc_getacl(inode, type);
 67         if (IS_ERR(acl))
 68                 return PTR_ERR(acl);
 69         else if (acl) {
 70                 if (type == ACL_TYPE_ACCESS && acl->a_count == 0)
 71                         error = -ENODATA;
 72                 else
 73                         error = posix_acl_to_xattr(acl, buffer, size);
 74                 posix_acl_release(acl);
 75         } else
 76                 error = -ENODATA;
 77 
 78         return error;
 79 }
 80 
 81 int nfs3_setxattr(struct dentry *dentry, const char *name,
 82              const void *value, size_t size, int flags)
 83 {
 84         struct inode *inode = dentry->d_inode;
 85         struct posix_acl *acl;
 86         int type, error;
 87 
 88         if (strcmp(name, POSIX_ACL_XATTR_ACCESS) == 0)
 89                 type = ACL_TYPE_ACCESS;
 90         else if (strcmp(name, POSIX_ACL_XATTR_DEFAULT) == 0)
 91                 type = ACL_TYPE_DEFAULT;
 92         else
 93                 return -EOPNOTSUPP;
 94 
 95         acl = posix_acl_from_xattr(value, size);
 96         if (IS_ERR(acl))
 97                 return PTR_ERR(acl);
 98         error = nfs3_proc_setacl(inode, type, acl);
 99         posix_acl_release(acl);
100 
101         return error;
102 }
103 
104 int nfs3_removexattr(struct dentry *dentry, const char *name)
105 {
106         struct inode *inode = dentry->d_inode;
107         int type;
108 
109         if (strcmp(name, POSIX_ACL_XATTR_ACCESS) == 0)
110                 type = ACL_TYPE_ACCESS;
111         else if (strcmp(name, POSIX_ACL_XATTR_DEFAULT) == 0)
112                 type = ACL_TYPE_DEFAULT;
113         else
114                 return -EOPNOTSUPP;
115 
116         return nfs3_proc_setacl(inode, type, NULL);
117 }
118 
119 static void __nfs3_forget_cached_acls(struct nfs_inode *nfsi)
120 {
121         if (!IS_ERR(nfsi->acl_access)) {
122                 posix_acl_release(nfsi->acl_access);
123                 nfsi->acl_access = ERR_PTR(-EAGAIN);
124         }
125         if (!IS_ERR(nfsi->acl_default)) {
126                 posix_acl_release(nfsi->acl_default);
127                 nfsi->acl_default = ERR_PTR(-EAGAIN);
128         }
129 }
130 
131 void nfs3_forget_cached_acls(struct inode *inode)
132 {
133         dprintk("NFS: nfs3_forget_cached_acls(%s/%ld)\n", inode->i_sb->s_id,
134                 inode->i_ino);
135         spin_lock(&inode->i_lock);
136         __nfs3_forget_cached_acls(NFS_I(inode));
137         spin_unlock(&inode->i_lock);
138 }
139 
140 static struct posix_acl *nfs3_get_cached_acl(struct inode *inode, int type)
141 {
142         struct nfs_inode *nfsi = NFS_I(inode);
143         struct posix_acl *acl = ERR_PTR(-EINVAL);
144 
145         spin_lock(&inode->i_lock);
146         switch(type) {
147                 case ACL_TYPE_ACCESS:
148                         acl = nfsi->acl_access;
149                         break;
150 
151                 case ACL_TYPE_DEFAULT:
152                         acl = nfsi->acl_default;
153                         break;
154 
155                 default:
156                         goto out;
157         }
158         if (IS_ERR(acl))
159                 acl = ERR_PTR(-EAGAIN);
160         else
161                 acl = posix_acl_dup(acl);
162 out:
163         spin_unlock(&inode->i_lock);
164         dprintk("NFS: nfs3_get_cached_acl(%s/%ld, %d) = %p\n", inode->i_sb->s_id,
165                 inode->i_ino, type, acl);
166         return acl;
167 }
168 
169 static void nfs3_cache_acls(struct inode *inode, struct posix_acl *acl,
170                     struct posix_acl *dfacl)
171 {
172         struct nfs_inode *nfsi = NFS_I(inode);
173 
174         dprintk("nfs3_cache_acls(%s/%ld, %p, %p)\n", inode->i_sb->s_id,
175                 inode->i_ino, acl, dfacl);
176         spin_lock(&inode->i_lock);
177         __nfs3_forget_cached_acls(NFS_I(inode));
178         if (!IS_ERR(acl))
179                 nfsi->acl_access = posix_acl_dup(acl);
180         if (!IS_ERR(dfacl))
181                 nfsi->acl_default = posix_acl_dup(dfacl);
182         spin_unlock(&inode->i_lock);
183 }
184 
185 struct posix_acl *nfs3_proc_getacl(struct inode *inode, int type)
186 {
187         struct nfs_server *server = NFS_SERVER(inode);
188         struct page *pages[NFSACL_MAXPAGES] = { };
189         struct nfs3_getaclargs args = {
190                 .fh = NFS_FH(inode),
191                 /* The xdr layer may allocate pages here. */
192                 .pages = pages,
193         };
194         struct nfs3_getaclres res = {
195                 0
196         };
197         struct rpc_message msg = {
198                 .rpc_argp       = &args,
199                 .rpc_resp       = &res,
200         };
201         struct posix_acl *acl;
202         int status, count;
203 
204         if (!nfs_server_capable(inode, NFS_CAP_ACLS))
205                 return ERR_PTR(-EOPNOTSUPP);
206 
207         status = nfs_revalidate_inode(server, inode);
208         if (status < 0)
209                 return ERR_PTR(status);
210         acl = nfs3_get_cached_acl(inode, type);
211         if (acl != ERR_PTR(-EAGAIN))
212                 return acl;
213         acl = NULL;
214 
215         /*
216          * Only get the access acl when explicitly requested: We don't
217          * need it for access decisions, and only some applications use
218          * it. Applications which request the access acl first are not
219          * penalized from this optimization.
220          */
221         if (type == ACL_TYPE_ACCESS)
222                 args.mask |= NFS_ACLCNT|NFS_ACL;
223         if (S_ISDIR(inode->i_mode))
224                 args.mask |= NFS_DFACLCNT|NFS_DFACL;
225         if (args.mask == 0)
226                 return NULL;
227 
228         dprintk("NFS call getacl\n");
229         msg.rpc_proc = &server->client_acl->cl_procinfo[ACLPROC3_GETACL];
230         res.fattr = nfs_alloc_fattr();
231         if (res.fattr == NULL)
232                 return ERR_PTR(-ENOMEM);
233 
234         status = rpc_call_sync(server->client_acl, &msg, 0);
235         dprintk("NFS reply getacl: %d\n", status);
236 
237         /* pages may have been allocated at the xdr layer. */
238         for (count = 0; count < NFSACL_MAXPAGES && args.pages[count]; count++)
239                 __free_page(args.pages[count]);
240 
241         switch (status) {
242                 case 0:
243                         status = nfs_refresh_inode(inode, res.fattr);
244                         break;
245                 case -EPFNOSUPPORT:
246                 case -EPROTONOSUPPORT:
247                         dprintk("NFS_V3_ACL extension not supported; disabling\n");
248                         server->caps &= ~NFS_CAP_ACLS;
249                 case -ENOTSUPP:
250                         status = -EOPNOTSUPP;
251                 default:
252                         goto getout;
253         }
254         if ((args.mask & res.mask) != args.mask) {
255                 status = -EIO;
256                 goto getout;
257         }
258 
259         if (res.acl_access != NULL) {
260                 if (posix_acl_equiv_mode(res.acl_access, NULL) == 0) {
261                         posix_acl_release(res.acl_access);
262                         res.acl_access = NULL;
263                 }
264         }
265         nfs3_cache_acls(inode,
266                 (res.mask & NFS_ACL)   ? res.acl_access  : ERR_PTR(-EINVAL),
267                 (res.mask & NFS_DFACL) ? res.acl_default : ERR_PTR(-EINVAL));
268 
269         switch(type) {
270                 case ACL_TYPE_ACCESS:
271                         acl = res.acl_access;
272                         res.acl_access = NULL;
273                         break;
274 
275                 case ACL_TYPE_DEFAULT:
276                         acl = res.acl_default;
277                         res.acl_default = NULL;
278         }
279 
280 getout:
281         posix_acl_release(res.acl_access);
282         posix_acl_release(res.acl_default);
283         nfs_free_fattr(res.fattr);
284 
285         if (status != 0) {
286                 posix_acl_release(acl);
287                 acl = ERR_PTR(status);
288         }
289         return acl;
290 }
291 
292 static int nfs3_proc_setacls(struct inode *inode, struct posix_acl *acl,
293                   struct posix_acl *dfacl)
294 {
295         struct nfs_server *server = NFS_SERVER(inode);
296         struct nfs_fattr *fattr;
297         struct page *pages[NFSACL_MAXPAGES];
298         struct nfs3_setaclargs args = {
299                 .inode = inode,
300                 .mask = NFS_ACL,
301                 .acl_access = acl,
302                 .pages = pages,
303         };
304         struct rpc_message msg = {
305                 .rpc_argp       = &args,
306                 .rpc_resp       = &fattr,
307         };
308         int status;
309 
310         status = -EOPNOTSUPP;
311         if (!nfs_server_capable(inode, NFS_CAP_ACLS))
312                 goto out;
313 
314         /* We are doing this here because XDR marshalling does not
315          * return any results, it BUGs. */
316         status = -ENOSPC;
317         if (acl != NULL && acl->a_count > NFS_ACL_MAX_ENTRIES)
318                 goto out;
319         if (dfacl != NULL && dfacl->a_count > NFS_ACL_MAX_ENTRIES)
320                 goto out;
321         if (S_ISDIR(inode->i_mode)) {
322                 args.mask |= NFS_DFACL;
323                 args.acl_default = dfacl;
324                 args.len = nfsacl_size(acl, dfacl);
325         } else
326                 args.len = nfsacl_size(acl, NULL);
327 
328         if (args.len > NFS_ACL_INLINE_BUFSIZE) {
329                 unsigned int npages = 1 + ((args.len - 1) >> PAGE_SHIFT);
330 
331                 status = -ENOMEM;
332                 do {
333                         args.pages[args.npages] = alloc_page(GFP_KERNEL);
334                         if (args.pages[args.npages] == NULL)
335                                 goto out_freepages;
336                         args.npages++;
337                 } while (args.npages < npages);
338         }
339 
340         dprintk("NFS call setacl\n");
341         status = -ENOMEM;
342         fattr = nfs_alloc_fattr();
343         if (fattr == NULL)
344                 goto out_freepages;
345 
346         msg.rpc_proc = &server->client_acl->cl_procinfo[ACLPROC3_SETACL];
347         msg.rpc_resp = fattr;
348         status = rpc_call_sync(server->client_acl, &msg, 0);
349         nfs_access_zap_cache(inode);
350         nfs_zap_acl_cache(inode);
351         dprintk("NFS reply setacl: %d\n", status);
352 
353         switch (status) {
354                 case 0:
355                         status = nfs_refresh_inode(inode, fattr);
356                         nfs3_cache_acls(inode, acl, dfacl);
357                         break;
358                 case -EPFNOSUPPORT:
359                 case -EPROTONOSUPPORT:
360                         dprintk("NFS_V3_ACL SETACL RPC not supported"
361                                         "(will not retry)\n");
362                         server->caps &= ~NFS_CAP_ACLS;
363                 case -ENOTSUPP:
364                         status = -EOPNOTSUPP;
365         }
366         nfs_free_fattr(fattr);
367 out_freepages:
368         while (args.npages != 0) {
369                 args.npages--;
370                 __free_page(args.pages[args.npages]);
371         }
372 out:
373         return status;
374 }
375 
376 int nfs3_proc_setacl(struct inode *inode, int type, struct posix_acl *acl)
377 {
378         struct posix_acl *alloc = NULL, *dfacl = NULL;
379         int status;
380 
381         if (S_ISDIR(inode->i_mode)) {
382                 switch(type) {
383                         case ACL_TYPE_ACCESS:
384                                 alloc = dfacl = nfs3_proc_getacl(inode,
385                                                 ACL_TYPE_DEFAULT);
386                                 if (IS_ERR(alloc))
387                                         goto fail;
388                                 break;
389 
390                         case ACL_TYPE_DEFAULT:
391                                 dfacl = acl;
392                                 alloc = acl = nfs3_proc_getacl(inode,
393                                                 ACL_TYPE_ACCESS);
394                                 if (IS_ERR(alloc))
395                                         goto fail;
396                                 break;
397 
398                         default:
399                                 return -EINVAL;
400                 }
401         } else if (type != ACL_TYPE_ACCESS)
402                         return -EINVAL;
403 
404         if (acl == NULL) {
405                 alloc = acl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL);
406                 if (IS_ERR(alloc))
407                         goto fail;
408         }
409         status = nfs3_proc_setacls(inode, acl, dfacl);
410         posix_acl_release(alloc);
411         return status;
412 
413 fail:
414         return PTR_ERR(alloc);
415 }
416 
417 int nfs3_proc_set_default_acl(struct inode *dir, struct inode *inode,
418                 umode_t mode)
419 {
420         struct posix_acl *dfacl, *acl;
421         int error = 0;
422 
423         dfacl = nfs3_proc_getacl(dir, ACL_TYPE_DEFAULT);
424         if (IS_ERR(dfacl)) {
425                 error = PTR_ERR(dfacl);
426                 return (error == -EOPNOTSUPP) ? 0 : error;
427         }
428         if (!dfacl)
429                 return 0;
430         acl = posix_acl_dup(dfacl);
431         error = posix_acl_create(&acl, GFP_KERNEL, &mode);
432         if (error < 0)
433                 goto out_release_dfacl;
434         error = nfs3_proc_setacls(inode, acl, S_ISDIR(inode->i_mode) ?
435                                                       dfacl : NULL);
436         posix_acl_release(acl);
437 out_release_dfacl:
438         posix_acl_release(dfacl);
439         return error;
440 }
441 

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