4 * Copyright (C) 1992 Rick Sladkey
6 #include <linux/nfs_fs.h>
11 #ifdef CONFIG_NFS_V4_2
15 #define NFSDBG_FACILITY NFSDBG_FILE
18 nfs4_file_open(struct inode
*inode
, struct file
*filp
)
20 struct nfs_open_context
*ctx
;
21 struct dentry
*dentry
= filp
->f_path
.dentry
;
22 struct dentry
*parent
= NULL
;
24 unsigned openflags
= filp
->f_flags
;
30 * If no cached dentry exists or if it's negative, NFSv4 handled the
31 * opens in ->lookup() or ->create().
33 * We only get this far for a cached positive dentry. We skipped
34 * revalidation, so handle it here by dropping the dentry and returning
35 * -EOPENSTALE. The VFS will retry the lookup/create/open.
38 dprintk("NFS: open file(%pd2)\n", dentry
);
40 if ((openflags
& O_ACCMODE
) == 3)
43 /* We can't create new files here */
44 openflags
&= ~(O_CREAT
|O_EXCL
);
46 parent
= dget_parent(dentry
);
47 dir
= parent
->d_inode
;
49 ctx
= alloc_nfs_open_context(filp
->f_path
.dentry
, filp
->f_mode
);
54 attr
.ia_valid
= ATTR_OPEN
;
55 if (openflags
& O_TRUNC
) {
56 attr
.ia_valid
|= ATTR_SIZE
;
61 inode
= NFS_PROTO(dir
)->open_context(dir
, ctx
, openflags
, &attr
, &opened
);
75 if (inode
!= dentry
->d_inode
)
78 nfs_set_verifier(dentry
, nfs_save_change_attribute(dir
));
79 nfs_file_set_open_context(filp
, ctx
);
80 nfs_fscache_open_file(inode
, filp
);
84 put_nfs_open_context(ctx
);
96 nfs4_file_fsync(struct file
*file
, loff_t start
, loff_t end
, int datasync
)
99 struct inode
*inode
= file_inode(file
);
102 ret
= filemap_write_and_wait_range(inode
->i_mapping
, start
, end
);
105 mutex_lock(&inode
->i_mutex
);
106 ret
= nfs_file_fsync_commit(file
, start
, end
, datasync
);
108 ret
= pnfs_layoutcommit_inode(inode
, true);
109 mutex_unlock(&inode
->i_mutex
);
111 * If nfs_file_fsync_commit detected a server reboot, then
112 * resend all dirty pages that might have been covered by
113 * the NFS_CONTEXT_RESEND_WRITES flag
117 } while (ret
== -EAGAIN
);
122 #ifdef CONFIG_NFS_V4_2
123 static loff_t
nfs4_file_llseek(struct file
*filep
, loff_t offset
, int whence
)
130 ret
= nfs42_proc_llseek(filep
, offset
, whence
);
131 if (ret
!= -ENOTSUPP
)
134 return nfs_file_llseek(filep
, offset
, whence
);
137 #endif /* CONFIG_NFS_V4_2 */
139 const struct file_operations nfs4_file_operations
= {
140 #ifdef CONFIG_NFS_V4_2
141 .llseek
= nfs4_file_llseek
,
143 .llseek
= nfs_file_llseek
,
145 .read
= new_sync_read
,
146 .write
= new_sync_write
,
147 .read_iter
= nfs_file_read
,
148 .write_iter
= nfs_file_write
,
149 .mmap
= nfs_file_mmap
,
150 .open
= nfs4_file_open
,
151 .flush
= nfs_file_flush
,
152 .release
= nfs_file_release
,
153 .fsync
= nfs4_file_fsync
,
156 .splice_read
= nfs_file_splice_read
,
157 .splice_write
= iter_file_splice_write
,
158 .check_flags
= nfs_check_flags
,
159 .setlease
= simple_nosetlease
,