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Linux/fs/nfs/nfs4file.c

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  1 /*
  2  *  linux/fs/nfs/file.c
  3  *
  4  *  Copyright (C) 1992  Rick Sladkey
  5  */
  6 #include <linux/fs.h>
  7 #include <linux/file.h>
  8 #include <linux/falloc.h>
  9 #include <linux/nfs_fs.h>
 10 #include <uapi/linux/btrfs.h>   /* BTRFS_IOC_CLONE/BTRFS_IOC_CLONE_RANGE */
 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                 openflags--;
 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);
 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                 nfs_sync_inode(inode);
 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 loff_t nfs4_file_llseek(struct file *filep, loff_t offset, int whence)
133 {
134         loff_t ret;
135 
136         switch (whence) {
137         case SEEK_HOLE:
138         case SEEK_DATA:
139                 ret = nfs42_proc_llseek(filep, offset, whence);
140                 if (ret != -ENOTSUPP)
141                         return ret;
142         default:
143                 return nfs_file_llseek(filep, offset, whence);
144         }
145 }
146 
147 static long nfs42_fallocate(struct file *filep, int mode, loff_t offset, loff_t len)
148 {
149         struct inode *inode = file_inode(filep);
150         long ret;
151 
152         if (!S_ISREG(inode->i_mode))
153                 return -EOPNOTSUPP;
154 
155         if ((mode != 0) && (mode != (FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE)))
156                 return -EOPNOTSUPP;
157 
158         ret = inode_newsize_ok(inode, offset + len);
159         if (ret < 0)
160                 return ret;
161 
162         if (mode & FALLOC_FL_PUNCH_HOLE)
163                 return nfs42_proc_deallocate(filep, offset, len);
164         return nfs42_proc_allocate(filep, offset, len);
165 }
166 
167 static int nfs42_clone_file_range(struct file *src_file, loff_t src_off,
168                 struct file *dst_file, loff_t dst_off, u64 count)
169 {
170         struct inode *dst_inode = file_inode(dst_file);
171         struct nfs_server *server = NFS_SERVER(dst_inode);
172         struct inode *src_inode = file_inode(src_file);
173         unsigned int bs = server->clone_blksize;
174         bool same_inode = false;
175         int ret;
176 
177         /* check alignment w.r.t. clone_blksize */
178         ret = -EINVAL;
179         if (bs) {
180                 if (!IS_ALIGNED(src_off, bs) || !IS_ALIGNED(dst_off, bs))
181                         goto out;
182                 if (!IS_ALIGNED(count, bs) && i_size_read(src_inode) != (src_off + count))
183                         goto out;
184         }
185 
186         if (src_inode == dst_inode)
187                 same_inode = true;
188 
189         /* XXX: do we lock at all? what if server needs CB_RECALL_LAYOUT? */
190         if (same_inode) {
191                 inode_lock(src_inode);
192         } else if (dst_inode < src_inode) {
193                 inode_lock_nested(dst_inode, I_MUTEX_PARENT);
194                 inode_lock_nested(src_inode, I_MUTEX_CHILD);
195         } else {
196                 inode_lock_nested(src_inode, I_MUTEX_PARENT);
197                 inode_lock_nested(dst_inode, I_MUTEX_CHILD);
198         }
199 
200         /* flush all pending writes on both src and dst so that server
201          * has the latest data */
202         ret = nfs_sync_inode(src_inode);
203         if (ret)
204                 goto out_unlock;
205         ret = nfs_sync_inode(dst_inode);
206         if (ret)
207                 goto out_unlock;
208 
209         ret = nfs42_proc_clone(src_file, dst_file, src_off, dst_off, count);
210 
211         /* truncate inode page cache of the dst range so that future reads can fetch
212          * new data from server */
213         if (!ret)
214                 truncate_inode_pages_range(&dst_inode->i_data, dst_off, dst_off + count - 1);
215 
216 out_unlock:
217         if (same_inode) {
218                 inode_unlock(src_inode);
219         } else if (dst_inode < src_inode) {
220                 inode_unlock(src_inode);
221                 inode_unlock(dst_inode);
222         } else {
223                 inode_unlock(dst_inode);
224                 inode_unlock(src_inode);
225         }
226 out:
227         return ret;
228 }
229 #endif /* CONFIG_NFS_V4_2 */
230 
231 const struct file_operations nfs4_file_operations = {
232         .read_iter      = nfs_file_read,
233         .write_iter     = nfs_file_write,
234         .mmap           = nfs_file_mmap,
235         .open           = nfs4_file_open,
236         .flush          = nfs4_file_flush,
237         .release        = nfs_file_release,
238         .fsync          = nfs_file_fsync,
239         .lock           = nfs_lock,
240         .flock          = nfs_flock,
241         .splice_read    = nfs_file_splice_read,
242         .splice_write   = iter_file_splice_write,
243         .check_flags    = nfs_check_flags,
244         .setlease       = simple_nosetlease,
245 #ifdef CONFIG_NFS_V4_2
246         .llseek         = nfs4_file_llseek,
247         .fallocate      = nfs42_fallocate,
248         .clone_file_range = nfs42_clone_file_range,
249 #else
250         .llseek         = nfs_file_llseek,
251 #endif
252 };
253 

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