Merge with rsync://fileserver/linux

Update to Linus latest

1 files changed, 81 insertions, 7 deletions

diff --git a/fs/nfs/file.c b/fs/nfs/file.c
index f06eee6dcff5..5621ba9885f4 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)