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

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

Version: ~ [ linux-5.16-rc3 ] ~ [ linux-5.15.5 ] ~ [ linux-5.14.21 ] ~ [ linux-5.13.19 ] ~ [ linux-5.12.19 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.82 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.162 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.218 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.256 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.291 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.293 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.18.140 ] ~ [ linux-3.16.85 ] ~ [ linux-3.14.79 ] ~ [ linux-3.12.74 ] ~ [ 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 struct posix_acl *nfs3_get_acl(struct inode *inode, int type)
 15 {
 16         struct nfs_server *server = NFS_SERVER(inode);
 17         struct page *pages[NFSACL_MAXPAGES] = { };
 18         struct nfs3_getaclargs args = {
 19                 .fh = NFS_FH(inode),
 20                 /* The xdr layer may allocate pages here. */
 21                 .pages = pages,
 22         };
 23         struct nfs3_getaclres res = {
 24                 NULL,
 25         };
 26         struct rpc_message msg = {
 27                 .rpc_argp       = &args,
 28                 .rpc_resp       = &res,
 29         };
 30         int status, count;
 31 
 32         if (!nfs_server_capable(inode, NFS_CAP_ACLS))
 33                 return ERR_PTR(-EOPNOTSUPP);
 34 
 35         status = nfs_revalidate_inode(server, inode);
 36         if (status < 0)
 37                 return ERR_PTR(status);
 38 
 39         /*
 40          * Only get the access acl when explicitly requested: We don't
 41          * need it for access decisions, and only some applications use
 42          * it. Applications which request the access acl first are not
 43          * penalized from this optimization.
 44          */
 45         if (type == ACL_TYPE_ACCESS)
 46                 args.mask |= NFS_ACLCNT|NFS_ACL;
 47         if (S_ISDIR(inode->i_mode))
 48                 args.mask |= NFS_DFACLCNT|NFS_DFACL;
 49         if (args.mask == 0)
 50                 return NULL;
 51 
 52         dprintk("NFS call getacl\n");
 53         msg.rpc_proc = &server->client_acl->cl_procinfo[ACLPROC3_GETACL];
 54         res.fattr = nfs_alloc_fattr();
 55         if (res.fattr == NULL)
 56                 return ERR_PTR(-ENOMEM);
 57 
 58         status = rpc_call_sync(server->client_acl, &msg, 0);
 59         dprintk("NFS reply getacl: %d\n", status);
 60 
 61         /* pages may have been allocated at the xdr layer. */
 62         for (count = 0; count < NFSACL_MAXPAGES && args.pages[count]; count++)
 63                 __free_page(args.pages[count]);
 64 
 65         switch (status) {
 66                 case 0:
 67                         status = nfs_refresh_inode(inode, res.fattr);
 68                         break;
 69                 case -EPFNOSUPPORT:
 70                 case -EPROTONOSUPPORT:
 71                         dprintk("NFS_V3_ACL extension not supported; disabling\n");
 72                         server->caps &= ~NFS_CAP_ACLS;
 73                 case -ENOTSUPP:
 74                         status = -EOPNOTSUPP;
 75                 default:
 76                         goto getout;
 77         }
 78         if ((args.mask & res.mask) != args.mask) {
 79                 status = -EIO;
 80                 goto getout;
 81         }
 82 
 83         if (res.acl_access != NULL) {
 84                 if ((posix_acl_equiv_mode(res.acl_access, NULL) == 0) ||
 85                     res.acl_access->a_count == 0) {
 86                         posix_acl_release(res.acl_access);
 87                         res.acl_access = NULL;
 88                 }
 89         }
 90 
 91         if (res.mask & NFS_ACL)
 92                 set_cached_acl(inode, ACL_TYPE_ACCESS, res.acl_access);
 93         else
 94                 forget_cached_acl(inode, ACL_TYPE_ACCESS);
 95 
 96         if (res.mask & NFS_DFACL)
 97                 set_cached_acl(inode, ACL_TYPE_DEFAULT, res.acl_default);
 98         else
 99                 forget_cached_acl(inode, ACL_TYPE_DEFAULT);
100 
101         nfs_free_fattr(res.fattr);
102         if (type == ACL_TYPE_ACCESS) {
103                 posix_acl_release(res.acl_default);
104                 return res.acl_access;
105         } else {
106                 posix_acl_release(res.acl_access);
107                 return res.acl_default;
108         }
109 
110 getout:
111         posix_acl_release(res.acl_access);
112         posix_acl_release(res.acl_default);
113         nfs_free_fattr(res.fattr);
114         return ERR_PTR(status);
115 }
116 
117 static int __nfs3_proc_setacls(struct inode *inode, struct posix_acl *acl,
118                 struct posix_acl *dfacl)
119 {
120         struct nfs_server *server = NFS_SERVER(inode);
121         struct nfs_fattr *fattr;
122         struct page *pages[NFSACL_MAXPAGES];
123         struct nfs3_setaclargs args = {
124                 .inode = inode,
125                 .mask = NFS_ACL,
126                 .acl_access = acl,
127                 .pages = pages,
128         };
129         struct rpc_message msg = {
130                 .rpc_argp       = &args,
131                 .rpc_resp       = &fattr,
132         };
133         int status = 0;
134 
135         if (acl == NULL && (!S_ISDIR(inode->i_mode) || dfacl == NULL))
136                 goto out;
137 
138         status = -EOPNOTSUPP;
139         if (!nfs_server_capable(inode, NFS_CAP_ACLS))
140                 goto out;
141 
142         /* We are doing this here because XDR marshalling does not
143          * return any results, it BUGs. */
144         status = -ENOSPC;
145         if (acl != NULL && acl->a_count > NFS_ACL_MAX_ENTRIES)
146                 goto out;
147         if (dfacl != NULL && dfacl->a_count > NFS_ACL_MAX_ENTRIES)
148                 goto out;
149         if (S_ISDIR(inode->i_mode)) {
150                 args.mask |= NFS_DFACL;
151                 args.acl_default = dfacl;
152                 args.len = nfsacl_size(acl, dfacl);
153         } else
154                 args.len = nfsacl_size(acl, NULL);
155 
156         if (args.len > NFS_ACL_INLINE_BUFSIZE) {
157                 unsigned int npages = 1 + ((args.len - 1) >> PAGE_SHIFT);
158 
159                 status = -ENOMEM;
160                 do {
161                         args.pages[args.npages] = alloc_page(GFP_KERNEL);
162                         if (args.pages[args.npages] == NULL)
163                                 goto out_freepages;
164                         args.npages++;
165                 } while (args.npages < npages);
166         }
167 
168         dprintk("NFS call setacl\n");
169         status = -ENOMEM;
170         fattr = nfs_alloc_fattr();
171         if (fattr == NULL)
172                 goto out_freepages;
173 
174         msg.rpc_proc = &server->client_acl->cl_procinfo[ACLPROC3_SETACL];
175         msg.rpc_resp = fattr;
176         status = rpc_call_sync(server->client_acl, &msg, 0);
177         nfs_access_zap_cache(inode);
178         nfs_zap_acl_cache(inode);
179         dprintk("NFS reply setacl: %d\n", status);
180 
181         switch (status) {
182                 case 0:
183                         status = nfs_refresh_inode(inode, fattr);
184                         set_cached_acl(inode, ACL_TYPE_ACCESS, acl);
185                         set_cached_acl(inode, ACL_TYPE_DEFAULT, dfacl);
186                         break;
187                 case -EPFNOSUPPORT:
188                 case -EPROTONOSUPPORT:
189                         dprintk("NFS_V3_ACL SETACL RPC not supported"
190                                         "(will not retry)\n");
191                         server->caps &= ~NFS_CAP_ACLS;
192                 case -ENOTSUPP:
193                         status = -EOPNOTSUPP;
194         }
195         nfs_free_fattr(fattr);
196 out_freepages:
197         while (args.npages != 0) {
198                 args.npages--;
199                 __free_page(args.pages[args.npages]);
200         }
201 out:
202         return status;
203 }
204 
205 int nfs3_proc_setacls(struct inode *inode, struct posix_acl *acl,
206                 struct posix_acl *dfacl)
207 {
208         int ret;
209         ret = __nfs3_proc_setacls(inode, acl, dfacl);
210         return (ret == -EOPNOTSUPP) ? 0 : ret;
211 
212 }
213 
214 int nfs3_set_acl(struct inode *inode, struct posix_acl *acl, int type)
215 {
216         struct posix_acl *alloc = NULL, *dfacl = NULL;
217         int status;
218 
219         if (S_ISDIR(inode->i_mode)) {
220                 switch(type) {
221                 case ACL_TYPE_ACCESS:
222                         alloc = dfacl = get_acl(inode, ACL_TYPE_DEFAULT);
223                         if (IS_ERR(alloc))
224                                 goto fail;
225                         break;
226 
227                 case ACL_TYPE_DEFAULT:
228                         dfacl = acl;
229                         alloc = acl = get_acl(inode, ACL_TYPE_ACCESS);
230                         if (IS_ERR(alloc))
231                                 goto fail;
232                         break;
233                 }
234         }
235 
236         if (acl == NULL) {
237                 alloc = acl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL);
238                 if (IS_ERR(alloc))
239                         goto fail;
240         }
241         status = __nfs3_proc_setacls(inode, acl, dfacl);
242         posix_acl_release(alloc);
243         return status;
244 
245 fail:
246         return PTR_ERR(alloc);
247 }
248 
249 const struct xattr_handler *nfs3_xattr_handlers[] = {
250         &posix_acl_access_xattr_handler,
251         &posix_acl_default_xattr_handler,
252         NULL,
253 };
254 
255 static int
256 nfs3_list_one_acl(struct inode *inode, int type, const char *name, void *data,
257                 size_t size, ssize_t *result)
258 {
259         struct posix_acl *acl;
260         char *p = data + *result;
261 
262         acl = get_acl(inode, type);
263         if (IS_ERR_OR_NULL(acl))
264                 return 0;
265 
266         posix_acl_release(acl);
267 
268         *result += strlen(name);
269         *result += 1;
270         if (!size)
271                 return 0;
272         if (*result > size)
273                 return -ERANGE;
274 
275         strcpy(p, name);
276         return 0;
277 }
278 
279 ssize_t
280 nfs3_listxattr(struct dentry *dentry, char *data, size_t size)
281 {
282         struct inode *inode = dentry->d_inode;
283         ssize_t result = 0;
284         int error;
285 
286         error = nfs3_list_one_acl(inode, ACL_TYPE_ACCESS,
287                         POSIX_ACL_XATTR_ACCESS, data, size, &result);
288         if (error)
289                 return error;
290 
291         error = nfs3_list_one_acl(inode, ACL_TYPE_DEFAULT,
292                         POSIX_ACL_XATTR_DEFAULT, data, size, &result);
293         if (error)
294                 return error;
295         return result;
296 }
297 

~ [ 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