ext4: use core vfs llseek code for dir seeks

Use the new functionality in generic_file_llseek_size() to
accept a custom EOF position, and un-cut-and-paste all the
vfs llseek code from ext4.

Also fix up comments on ext4_llseek() to reflect reality.

Signed-off-by: Eric Sandeen <sandeen@redaht.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

2 files changed, 17 insertions, 64 deletions

diff --git a/fs/ext4/dir.c b/fs/ext4/dir.c
index aa39e600d159..8e07d2a5a139 100644
--- a/fs/ext4/dir.c
+++ b/fs/ext4/dir.c
@@ -324,74 +324,27 @@ static inline loff_t ext4_get_htree_eof(struct file *filp)
 
 
 /*
- * ext4_dir_llseek() based on generic_file_llseek() to handle both
- * non-htree and htree directories, where the "offset" is in terms
- * of the filename hash value instead of the byte offset.
+ * ext4_dir_llseek() calls generic_file_llseek_size to handle htree
+ * directories, where the "offset" is in terms of the filename hash
+ * value instead of the byte offset.
  *
- * NOTE: offsets obtained *before* ext4_set_inode_flag(dir, EXT4_INODE_INDEX)
- *       will be invalid once the directory was converted into a dx directory
+ * Because we may return a 64-bit hash that is well beyond offset limits,
+ * we need to pass the max hash as the maximum allowable offset in
+ * the htree directory case.
+ *
+ * For non-htree, ext4_llseek already chooses the proper max offset.
  */
 loff_t ext4_dir_llseek(struct file *file, loff_t offset, int origin)
 {
         struct inode *inode = file->f_mapping->host;
-        loff_t ret = -EINVAL;
         int dx_dir = is_dx_dir(inode);
+        loff_t htree_max = ext4_get_htree_eof(file);
 
-        mutex_lock(&inode->i_mutex);
-
-        /* NOTE: relative offsets with dx directories might not work
-         *       as expected, as it is difficult to figure out the
-         *       correct offset between dx hashes */
-
-        switch (origin) {
-        case SEEK_END:
-                if (unlikely(offset > 0))
-                        goto out_err; /* not supported for directories */
-
-                /* so only negative offsets are left, does that have a
-                 * meaning for directories at all? */
-                if (dx_dir)
-                        offset += ext4_get_htree_eof(file);
-                else
-                        offset += inode->i_size;
-                break;
-        case SEEK_CUR:
-                /*
-                 * Here we special-case the lseek(fd, 0, SEEK_CUR)
-                 * position-querying operation.  Avoid rewriting the "same"
-                 * f_pos value back to the file because a concurrent read(),
-                 * write() or lseek() might have altered it
-                 */
-                if (offset == 0) {
-                        offset = file->f_pos;
-                        goto out_ok;
-                }
-
-                offset += file->f_pos;
-                break;
-        }
-
-        if (unlikely(offset < 0))
-                goto out_err;
-
-        if (!dx_dir) {
-                if (offset > inode->i_sb->s_maxbytes)
-                        goto out_err;
-        } else if (offset > ext4_get_htree_eof(file))
-                goto out_err;
-
-        /* Special lock needed here? */
-        if (offset != file->f_pos) {
-                file->f_pos = offset;
-                file->f_version = 0;
-        }
-
-out_ok:
-        ret = offset;
-out_err:
-        mutex_unlock(&inode->i_mutex);
-
-        return ret;
+        if (likely(dx_dir))
+                return generic_file_llseek_size(file, offset, origin,
+                                                    htree_max, htree_max);
+        else
+                return ext4_llseek(file, offset, origin);
 }
 
 /*
diff --git a/fs/ext4/file.c b/fs/ext4/file.c
index f3dadd0a0d51..782eecb57e43 100644
--- a/fs/ext4/file.c
+++ b/fs/ext4/file.c
@@ -211,9 +211,9 @@ static int ext4_file_open(struct inode * inode, struct file * filp)
 }
 
 /*
- * ext4_llseek() copied from generic_file_llseek() to handle both
- * block-mapped and extent-mapped maxbytes values. This should
- * otherwise be identical with generic_file_llseek().
+ * ext4_llseek() handles both block-mapped and extent-mapped maxbytes values
+ * by calling generic_file_llseek_size() with the appropriate maxbytes
+ * value for each.
  */
 loff_t ext4_llseek(struct file *file, loff_t offset, int origin)
 {