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Diffstat (limited to 'fs/nfs/file.c')
-rw-r--r--fs/nfs/file.c88
1 files changed, 81 insertions, 7 deletions
diff --git a/fs/nfs/file.c b/fs/nfs/file.c
index f06eee6dcff..5621ba9885f 100644
--- a/fs/nfs/file.c
+++ b/fs/nfs/file.c
@@ -37,6 +37,7 @@
static int nfs_file_open(struct inode *, struct file *);
static int nfs_file_release(struct inode *, struct file *);
+static loff_t nfs_file_llseek(struct file *file, loff_t offset, int origin);
static int nfs_file_mmap(struct file *, struct vm_area_struct *);
static ssize_t nfs_file_sendfile(struct file *, loff_t *, size_t, read_actor_t, void *);
static ssize_t nfs_file_read(struct kiocb *, char __user *, size_t, loff_t);
@@ -48,7 +49,7 @@ static int nfs_lock(struct file *filp, int cmd, struct file_lock *fl);
static int nfs_flock(struct file *filp, int cmd, struct file_lock *fl);
struct file_operations nfs_file_operations = {
- .llseek = remote_llseek,
+ .llseek = nfs_file_llseek,
.read = do_sync_read,
.write = do_sync_write,
.aio_read = nfs_file_read,
@@ -70,6 +71,18 @@ struct inode_operations nfs_file_inode_operations = {
.setattr = nfs_setattr,
};
+#ifdef CONFIG_NFS_V3
+struct inode_operations nfs3_file_inode_operations = {
+ .permission = nfs_permission,
+ .getattr = nfs_getattr,
+ .setattr = nfs_setattr,
+ .listxattr = nfs3_listxattr,
+ .getxattr = nfs3_getxattr,
+ .setxattr = nfs3_setxattr,
+ .removexattr = nfs3_removexattr,
+};
+#endif /* CONFIG_NFS_v3 */
+
/* Hack for future NFS swap support */
#ifndef IS_SWAPFILE
# define IS_SWAPFILE(inode) (0)
@@ -114,6 +127,61 @@ nfs_file_release(struct inode *inode, struct file *filp)
return NFS_PROTO(inode)->file_release(inode, filp);
}
+/**
+ * nfs_revalidate_file - Revalidate the page cache & related metadata
+ * @inode - pointer to inode struct
+ * @file - pointer to file
+ */
+static int nfs_revalidate_file(struct inode *inode, struct file *filp)
+{
+ int retval = 0;
+
+ if ((NFS_FLAGS(inode) & NFS_INO_REVAL_PAGECACHE) || nfs_attribute_timeout(inode))
+ retval = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
+ nfs_revalidate_mapping(inode, filp->f_mapping);
+ return 0;
+}
+
+/**
+ * nfs_revalidate_size - Revalidate the file size
+ * @inode - pointer to inode struct
+ * @file - pointer to struct file
+ *
+ * Revalidates the file length. This is basically a wrapper around
+ * nfs_revalidate_inode() that takes into account the fact that we may
+ * have cached writes (in which case we don't care about the server's
+ * idea of what the file length is), or O_DIRECT (in which case we
+ * shouldn't trust the cache).
+ */
+static int nfs_revalidate_file_size(struct inode *inode, struct file *filp)
+{
+ struct nfs_server *server = NFS_SERVER(inode);
+ struct nfs_inode *nfsi = NFS_I(inode);
+
+ if (server->flags & NFS_MOUNT_NOAC)
+ goto force_reval;
+ if (filp->f_flags & O_DIRECT)
+ goto force_reval;
+ if (nfsi->npages != 0)
+ return 0;
+ if (!(NFS_FLAGS(inode) & NFS_INO_REVAL_PAGECACHE) && !nfs_attribute_timeout(inode))
+ return 0;
+force_reval:
+ return __nfs_revalidate_inode(server, inode);
+}
+
+static loff_t nfs_file_llseek(struct file *filp, loff_t offset, int origin)
+{
+ /* origin == SEEK_END => we must revalidate the cached file length */
+ if (origin == 2) {
+ struct inode *inode = filp->f_mapping->host;
+ int retval = nfs_revalidate_file_size(inode, filp);
+ if (retval < 0)
+ return (loff_t)retval;
+ }
+ return remote_llseek(filp, offset, origin);
+}
+
/*
* Flush all dirty pages, and check for write errors.
*
@@ -158,7 +226,7 @@ nfs_file_read(struct kiocb *iocb, char __user * buf, size_t count, loff_t pos)
dentry->d_parent->d_name.name, dentry->d_name.name,
(unsigned long) count, (unsigned long) pos);
- result = nfs_revalidate_inode(NFS_SERVER(inode), inode);
+ result = nfs_revalidate_file(inode, iocb->ki_filp);
if (!result)
result = generic_file_aio_read(iocb, buf, count, pos);
return result;
@@ -176,7 +244,7 @@ nfs_file_sendfile(struct file *filp, loff_t *ppos, size_t count,
dentry->d_parent->d_name.name, dentry->d_name.name,
(unsigned long) count, (unsigned long long) *ppos);
- res = nfs_revalidate_inode(NFS_SERVER(inode), inode);
+ res = nfs_revalidate_file(inode, filp);
if (!res)
res = generic_file_sendfile(filp, ppos, count, actor, target);
return res;
@@ -192,7 +260,7 @@ nfs_file_mmap(struct file * file, struct vm_area_struct * vma)
dfprintk(VFS, "nfs: mmap(%s/%s)\n",
dentry->d_parent->d_name.name, dentry->d_name.name);
- status = nfs_revalidate_inode(NFS_SERVER(inode), inode);
+ status = nfs_revalidate_file(inode, file);
if (!status)
status = generic_file_mmap(file, vma);
return status;
@@ -281,9 +349,15 @@ nfs_file_write(struct kiocb *iocb, const char __user *buf, size_t count, loff_t
result = -EBUSY;
if (IS_SWAPFILE(inode))
goto out_swapfile;
- result = nfs_revalidate_inode(NFS_SERVER(inode), inode);
- if (result)
- goto out;
+ /*
+ * O_APPEND implies that we must revalidate the file length.
+ */
+ if (iocb->ki_filp->f_flags & O_APPEND) {
+ result = nfs_revalidate_file_size(inode, iocb->ki_filp);
+ if (result)
+ goto out;
+ }
+ nfs_revalidate_mapping(inode, iocb->ki_filp->f_mapping);
result = count;
if (!count)