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Linux/fs/nfs/nfs4file.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  *  linux/fs/nfs/file.c
  4  *
  5  *  Copyright (C) 1992  Rick Sladkey
  6  */
  7 #include <linux/fs.h>
  8 #include <linux/file.h>
  9 #include <linux/falloc.h>
 10 #include <linux/nfs_fs.h>
 11 #include "delegation.h"
 12 #include "internal.h"
 13 #include "iostat.h"
 14 #include "fscache.h"
 15 #include "pnfs.h"
 16 
 17 #include "nfstrace.h"
 18 
 19 #ifdef CONFIG_NFS_V4_2
 20 #include "nfs42.h"
 21 #endif
 22 
 23 #define NFSDBG_FACILITY         NFSDBG_FILE
 24 
 25 static int
 26 nfs4_file_open(struct inode *inode, struct file *filp)
 27 {
 28         struct nfs_open_context *ctx;
 29         struct dentry *dentry = file_dentry(filp);
 30         struct dentry *parent = NULL;
 31         struct inode *dir;
 32         unsigned openflags = filp->f_flags;
 33         struct iattr attr;
 34         int err;
 35 
 36         /*
 37          * If no cached dentry exists or if it's negative, NFSv4 handled the
 38          * opens in ->lookup() or ->create().
 39          *
 40          * We only get this far for a cached positive dentry.  We skipped
 41          * revalidation, so handle it here by dropping the dentry and returning
 42          * -EOPENSTALE.  The VFS will retry the lookup/create/open.
 43          */
 44 
 45         dprintk("NFS: open file(%pd2)\n", dentry);
 46 
 47         err = nfs_check_flags(openflags);
 48         if (err)
 49                 return err;
 50 
 51         if ((openflags & O_ACCMODE) == 3)
 52                 return nfs_open(inode, filp);
 53 
 54         /* We can't create new files here */
 55         openflags &= ~(O_CREAT|O_EXCL);
 56 
 57         parent = dget_parent(dentry);
 58         dir = d_inode(parent);
 59 
 60         ctx = alloc_nfs_open_context(file_dentry(filp), filp->f_mode, filp);
 61         err = PTR_ERR(ctx);
 62         if (IS_ERR(ctx))
 63                 goto out;
 64 
 65         attr.ia_valid = ATTR_OPEN;
 66         if (openflags & O_TRUNC) {
 67                 attr.ia_valid |= ATTR_SIZE;
 68                 attr.ia_size = 0;
 69                 filemap_write_and_wait(inode->i_mapping);
 70         }
 71 
 72         inode = NFS_PROTO(dir)->open_context(dir, ctx, openflags, &attr, NULL);
 73         if (IS_ERR(inode)) {
 74                 err = PTR_ERR(inode);
 75                 switch (err) {
 76                 case -EPERM:
 77                 case -EACCES:
 78                 case -EDQUOT:
 79                 case -ENOSPC:
 80                 case -EROFS:
 81                         goto out_put_ctx;
 82                 default:
 83                         goto out_drop;
 84                 }
 85         }
 86         if (inode != d_inode(dentry))
 87                 goto out_drop;
 88 
 89         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
 90         nfs_file_set_open_context(filp, ctx);
 91         nfs_fscache_open_file(inode, filp);
 92         err = 0;
 93 
 94 out_put_ctx:
 95         put_nfs_open_context(ctx);
 96 out:
 97         dput(parent);
 98         return err;
 99 
100 out_drop:
101         d_drop(dentry);
102         err = -EOPENSTALE;
103         goto out_put_ctx;
104 }
105 
106 /*
107  * Flush all dirty pages, and check for write errors.
108  */
109 static int
110 nfs4_file_flush(struct file *file, fl_owner_t id)
111 {
112         struct inode    *inode = file_inode(file);
113 
114         dprintk("NFS: flush(%pD2)\n", file);
115 
116         nfs_inc_stats(inode, NFSIOS_VFSFLUSH);
117         if ((file->f_mode & FMODE_WRITE) == 0)
118                 return 0;
119 
120         /*
121          * If we're holding a write delegation, then check if we're required
122          * to flush the i/o on close. If not, then just start the i/o now.
123          */
124         if (!nfs4_delegation_flush_on_close(inode))
125                 return filemap_fdatawrite(file->f_mapping);
126 
127         /* Flush writes to the server and return any errors */
128         return vfs_fsync(file, 0);
129 }
130 
131 #ifdef CONFIG_NFS_V4_2
132 static ssize_t nfs4_copy_file_range(struct file *file_in, loff_t pos_in,
133                                     struct file *file_out, loff_t pos_out,
134                                     size_t count, unsigned int flags)
135 {
136         if (!nfs_server_capable(file_inode(file_out), NFS_CAP_COPY))
137                 return -EOPNOTSUPP;
138         if (file_inode(file_in) == file_inode(file_out))
139                 return -EOPNOTSUPP;
140         return nfs42_proc_copy(file_in, pos_in, file_out, pos_out, count);
141 }
142 
143 static loff_t nfs4_file_llseek(struct file *filep, loff_t offset, int whence)
144 {
145         loff_t ret;
146 
147         switch (whence) {
148         case SEEK_HOLE:
149         case SEEK_DATA:
150                 ret = nfs42_proc_llseek(filep, offset, whence);
151                 if (ret != -ENOTSUPP)
152                         return ret;
153                 /* Fall through */
154         default:
155                 return nfs_file_llseek(filep, offset, whence);
156         }
157 }
158 
159 static long nfs42_fallocate(struct file *filep, int mode, loff_t offset, loff_t len)
160 {
161         struct inode *inode = file_inode(filep);
162         long ret;
163 
164         if (!S_ISREG(inode->i_mode))
165                 return -EOPNOTSUPP;
166 
167         if ((mode != 0) && (mode != (FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE)))
168                 return -EOPNOTSUPP;
169 
170         ret = inode_newsize_ok(inode, offset + len);
171         if (ret < 0)
172                 return ret;
173 
174         if (mode & FALLOC_FL_PUNCH_HOLE)
175                 return nfs42_proc_deallocate(filep, offset, len);
176         return nfs42_proc_allocate(filep, offset, len);
177 }
178 
179 static loff_t nfs42_remap_file_range(struct file *src_file, loff_t src_off,
180                 struct file *dst_file, loff_t dst_off, loff_t count,
181                 unsigned int remap_flags)
182 {
183         struct inode *dst_inode = file_inode(dst_file);
184         struct nfs_server *server = NFS_SERVER(dst_inode);
185         struct inode *src_inode = file_inode(src_file);
186         unsigned int bs = server->clone_blksize;
187         bool same_inode = false;
188         int ret;
189 
190         if (remap_flags & ~(REMAP_FILE_DEDUP | REMAP_FILE_ADVISORY))
191                 return -EINVAL;
192 
193         /* check alignment w.r.t. clone_blksize */
194         ret = -EINVAL;
195         if (bs) {
196                 if (!IS_ALIGNED(src_off, bs) || !IS_ALIGNED(dst_off, bs))
197                         goto out;
198                 if (!IS_ALIGNED(count, bs) && i_size_read(src_inode) != (src_off + count))
199                         goto out;
200         }
201 
202         if (src_inode == dst_inode)
203                 same_inode = true;
204 
205         /* XXX: do we lock at all? what if server needs CB_RECALL_LAYOUT? */
206         if (same_inode) {
207                 inode_lock(src_inode);
208         } else if (dst_inode < src_inode) {
209                 inode_lock_nested(dst_inode, I_MUTEX_PARENT);
210                 inode_lock_nested(src_inode, I_MUTEX_CHILD);
211         } else {
212                 inode_lock_nested(src_inode, I_MUTEX_PARENT);
213                 inode_lock_nested(dst_inode, I_MUTEX_CHILD);
214         }
215 
216         /* flush all pending writes on both src and dst so that server
217          * has the latest data */
218         ret = nfs_sync_inode(src_inode);
219         if (ret)
220                 goto out_unlock;
221         ret = nfs_sync_inode(dst_inode);
222         if (ret)
223                 goto out_unlock;
224 
225         ret = nfs42_proc_clone(src_file, dst_file, src_off, dst_off, count);
226 
227         /* truncate inode page cache of the dst range so that future reads can fetch
228          * new data from server */
229         if (!ret)
230                 truncate_inode_pages_range(&dst_inode->i_data, dst_off, dst_off + count - 1);
231 
232 out_unlock:
233         if (same_inode) {
234                 inode_unlock(src_inode);
235         } else if (dst_inode < src_inode) {
236                 inode_unlock(src_inode);
237                 inode_unlock(dst_inode);
238         } else {
239                 inode_unlock(dst_inode);
240                 inode_unlock(src_inode);
241         }
242 out:
243         return ret < 0 ? ret : count;
244 }
245 #endif /* CONFIG_NFS_V4_2 */
246 
247 const struct file_operations nfs4_file_operations = {
248         .read_iter      = nfs_file_read,
249         .write_iter     = nfs_file_write,
250         .mmap           = nfs_file_mmap,
251         .open           = nfs4_file_open,
252         .flush          = nfs4_file_flush,
253         .release        = nfs_file_release,
254         .fsync          = nfs_file_fsync,
255         .lock           = nfs_lock,
256         .flock          = nfs_flock,
257         .splice_read    = generic_file_splice_read,
258         .splice_write   = iter_file_splice_write,
259         .check_flags    = nfs_check_flags,
260         .setlease       = simple_nosetlease,
261 #ifdef CONFIG_NFS_V4_2
262         .copy_file_range = nfs4_copy_file_range,
263         .llseek         = nfs4_file_llseek,
264         .fallocate      = nfs42_fallocate,
265         .remap_file_range = nfs42_remap_file_range,
266 #else
267         .llseek         = nfs_file_llseek,
268 #endif
269 };
270 

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