Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux...

[firefly-linux-kernel-4.4.55.git] / fs / ecryptfs / mmap.c

diff --git a/fs/ecryptfs/mmap.c b/fs/ecryptfs/mmap.c
index 7be8e91b5ba08cd93c70ffe30a074ad6e4a93fc4..b731b09499cb8dcc996a87772b1090bd34484a83 100644 (file)
--- a/fs/ecryptfs/mmap.c
+++ b/fs/ecryptfs/mmap.c
@@ -446,6 +446,7 @@ static int ecryptfs_write_inode_size_to_header(struct file *lower_file,
        const struct address_space_operations *lower_a_ops;
        u64 file_size;
 
+retry:
        header_page = grab_cache_page(lower_inode->i_mapping, 0);
        if (!header_page) {
                ecryptfs_printk(KERN_ERR, "grab_cache_page for "
@@ -456,9 +457,10 @@ static int ecryptfs_write_inode_size_to_header(struct file *lower_file,
        lower_a_ops = lower_inode->i_mapping->a_ops;
        rc = lower_a_ops->prepare_write(lower_file, header_page, 0, 8);
        if (rc) {
-               if (rc == AOP_TRUNCATED_PAGE)
+               if (rc == AOP_TRUNCATED_PAGE) {
                        ecryptfs_release_lower_page(header_page, 0);
-               else
+                       goto retry;
+               } else
                        ecryptfs_release_lower_page(header_page, 1);
                goto out;
        }
@@ -473,9 +475,10 @@ static int ecryptfs_write_inode_size_to_header(struct file *lower_file,
        if (rc < 0)
                ecryptfs_printk(KERN_ERR, "Error commiting header page "
                                "write\n");
-       if (rc == AOP_TRUNCATED_PAGE)
+       if (rc == AOP_TRUNCATED_PAGE) {
                ecryptfs_release_lower_page(header_page, 0);
-       else
+               goto retry;
+       } else
                ecryptfs_release_lower_page(header_page, 1);
        lower_inode->i_mtime = lower_inode->i_ctime = CURRENT_TIME;
        mark_inode_dirty_sync(inode);
@@ -502,7 +505,8 @@ static int ecryptfs_write_inode_size_to_xattr(struct inode *lower_inode,
                goto out;
        }
        lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry);
-       if (!lower_dentry->d_inode->i_op->getxattr) {
+       if (!lower_dentry->d_inode->i_op->getxattr ||
+                       !lower_dentry->d_inode->i_op->setxattr) {
                printk(KERN_WARNING
                       "No support for setting xattr in lower filesystem\n");
                rc = -ENOSYS;
@@ -564,6 +568,7 @@ int ecryptfs_get_lower_page(struct page **lower_page, struct inode *lower_inode,
 {
        int rc = 0;
 
+retry:
        *lower_page = grab_cache_page(lower_inode->i_mapping, lower_page_index);
        if (!(*lower_page)) {
                rc = -EINVAL;
@@ -577,18 +582,18 @@ int ecryptfs_get_lower_page(struct page **lower_page, struct inode *lower_inode,
                                                          byte_offset,
                                                          region_bytes);
        if (rc) {
-               ecryptfs_printk(KERN_ERR, "prepare_write for "
+               if (rc == AOP_TRUNCATED_PAGE) {
+                       ecryptfs_release_lower_page(*lower_page, 0);
+                       goto retry;
+               } else {
+                       ecryptfs_printk(KERN_ERR, "prepare_write for "
                                "lower_page_index = [0x%.16x] failed; rc = "
                                "[%d]\n", lower_page_index, rc);
-       }
-out:
-       if (rc && (*lower_page)) {
-               if (rc == AOP_TRUNCATED_PAGE)
-                       ecryptfs_release_lower_page(*lower_page, 0);
-               else
                        ecryptfs_release_lower_page(*lower_page, 1);
-               (*lower_page) = NULL;
+                       (*lower_page) = NULL;
+               }
        }
+out:
        return rc;
 }