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

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