1 files changed, 106 insertions, 114 deletions

diff --git a/fs/ext4/file.c b/fs/ext4/file.c
index 8131be8c0af3..513c12cf444c 100644
--- a/fs/ext4/file.c
+++ b/fs/ext4/file.c
@@ -273,24 +273,19 @@ static int ext4_file_open(struct inode * inode, struct file * filp)
  * we determine this extent as a data or a hole according to whether the
  * page cache has data or not.
  */
-static int ext4_find_unwritten_pgoff(struct inode *inode,
-                                     int whence,
-                                     struct ext4_map_blocks *map,
-                                     loff_t *offset)
+static int ext4_find_unwritten_pgoff(struct inode *inode, int whence,
+                                     loff_t endoff, loff_t *offset)
 {
         struct pagevec pvec;
-        unsigned int blkbits;
         pgoff_t index;
         pgoff_t end;
-        loff_t endoff;
         loff_t startoff;
         loff_t lastoff;
         int found = 0;
 
-        blkbits = inode->i_sb->s_blocksize_bits;
         startoff = *offset;
         lastoff = startoff;
-        endoff = (loff_t)(map->m_lblk + map->m_len) << blkbits;
+
 
         index = startoff >> PAGE_CACHE_SHIFT;
         end = endoff >> PAGE_CACHE_SHIFT;
@@ -408,147 +403,144 @@ out:
 static loff_t ext4_seek_data(struct file *file, loff_t offset, loff_t maxsize)
 {
         struct inode *inode = file->f_mapping->host;
-        struct ext4_map_blocks map;
-        struct extent_status es;
-        ext4_lblk_t start, last, end;
-        loff_t dataoff, isize;
-        int blkbits;
-        int ret = 0;
+        struct fiemap_extent_info fie;
+        struct fiemap_extent ext[2];
+        loff_t next;
+        int i, ret = 0;
 
         mutex_lock(&inode->i_mutex);
-
-        isize = i_size_read(inode);
-        if (offset >= isize) {
+        if (offset >= inode->i_size) {
                 mutex_unlock(&inode->i_mutex);
                 return -ENXIO;
         }
-
-        blkbits = inode->i_sb->s_blocksize_bits;
-        start = offset >> blkbits;
-        last = start;
-        end = isize >> blkbits;
-        dataoff = offset;
-
-        do {
-                map.m_lblk = last;
-                map.m_len = end - last + 1;
-                ret = ext4_map_blocks(NULL, inode, &map, 0);
-                if (ret > 0 && !(map.m_flags & EXT4_MAP_UNWRITTEN)) {
-                        if (last != start)
-                                dataoff = (loff_t)last << blkbits;
+        fie.fi_flags = 0;
+        fie.fi_extents_max = 2;
+        fie.fi_extents_start = (struct fiemap_extent __user *) &ext;
+        while (1) {
+                mm_segment_t old_fs = get_fs();
+
+                fie.fi_extents_mapped = 0;
+                memset(ext, 0, sizeof(*ext) * fie.fi_extents_max);
+
+                set_fs(get_ds());
+                ret = ext4_fiemap(inode, &fie, offset, maxsize - offset);
+                set_fs(old_fs);
+                if (ret)
                         break;
-                }
 
-                /*
-                 * If there is a delay extent at this offset,
-                 * it will be as a data.
-                 */
-                ext4_es_find_delayed_extent_range(inode, last, last, &es);
-                if (es.es_len != 0 && in_range(last, es.es_lblk, es.es_len)) {
-                        if (last != start)
-                                dataoff = (loff_t)last << blkbits;
+                /* No extents found, EOF */
+                if (!fie.fi_extents_mapped) {
+                        ret = -ENXIO;
                         break;
                 }
+                for (i = 0; i < fie.fi_extents_mapped; i++) {
+                        next = (loff_t)(ext[i].fe_length + ext[i].fe_logical);
 
-                /*
-                 * If there is a unwritten extent at this offset,
-                 * it will be as a data or a hole according to page
-                 * cache that has data or not.
-                 */
-                if (map.m_flags & EXT4_MAP_UNWRITTEN) {
-                        int unwritten;
-                        unwritten = ext4_find_unwritten_pgoff(inode, SEEK_DATA,
-                                                              &map, &dataoff);
-                        if (unwritten)
-                                break;
-                }
+                        if (offset < (loff_t)ext[i].fe_logical)
+                                offset = (loff_t)ext[i].fe_logical;
+                        /*
+                         * If extent is not unwritten, then it contains valid
+                         * data, mapped or delayed.
+                         */
+                        if (!(ext[i].fe_flags & FIEMAP_EXTENT_UNWRITTEN))
+                                goto out;
 
-                last++;
-                dataoff = (loff_t)last << blkbits;
-        } while (last <= end);
+                        /*
+                         * If there is a unwritten extent at this offset,
+                         * it will be as a data or a hole according to page
+                         * cache that has data or not.
+                         */
+                        if (ext4_find_unwritten_pgoff(inode, SEEK_DATA,
+                                                      next, &offset))
+                                goto out;
 
+                        if (ext[i].fe_flags & FIEMAP_EXTENT_LAST) {
+                                ret = -ENXIO;
+                                goto out;
+                        }
+                        offset = next;
+                }
+        }
+        if (offset > inode->i_size)
+                offset = inode->i_size;
+out:
         mutex_unlock(&inode->i_mutex);
+        if (ret)
+                return ret;
 
-        if (dataoff > isize)
-                return -ENXIO;
-
-        return vfs_setpos(file, dataoff, maxsize);
+        return vfs_setpos(file, offset, maxsize);
 }
 
 /*
- * ext4_seek_hole() retrieves the offset for SEEK_HOLE.
+ * ext4_seek_hole() retrieves the offset for SEEK_HOLE
  */
 static loff_t ext4_seek_hole(struct file *file, loff_t offset, loff_t maxsize)
 {
         struct inode *inode = file->f_mapping->host;
-        struct ext4_map_blocks map;
-        struct extent_status es;
-        ext4_lblk_t start, last, end;
-        loff_t holeoff, isize;
-        int blkbits;
-        int ret = 0;
+        struct fiemap_extent_info fie;
+        struct fiemap_extent ext[2];
+        loff_t next;
+        int i, ret = 0;
 
         mutex_lock(&inode->i_mutex);
-
-        isize = i_size_read(inode);
-        if (offset >= isize) {
+        if (offset >= inode->i_size) {
                 mutex_unlock(&inode->i_mutex);
                 return -ENXIO;
         }
 
-        blkbits = inode->i_sb->s_blocksize_bits;
-        start = offset >> blkbits;
-        last = start;
-        end = isize >> blkbits;
-        holeoff = offset;
+        fie.fi_flags = 0;
+        fie.fi_extents_max = 2;
+        fie.fi_extents_start = (struct fiemap_extent __user *)&ext;
+        while (1) {
+                mm_segment_t old_fs = get_fs();
 
-        do {
-                map.m_lblk = last;
-                map.m_len = end - last + 1;
-                ret = ext4_map_blocks(NULL, inode, &map, 0);
-                if (ret > 0 && !(map.m_flags & EXT4_MAP_UNWRITTEN)) {
-                        last += ret;
-                        holeoff = (loff_t)last << blkbits;
-                        continue;
-                }
+                fie.fi_extents_mapped = 0;
+                memset(ext, 0, sizeof(*ext));
 
-                /*
-                 * If there is a delay extent at this offset,
-                 * we will skip this extent.
-                 */
-                ext4_es_find_delayed_extent_range(inode, last, last, &es);
-                if (es.es_len != 0 && in_range(last, es.es_lblk, es.es_len)) {
-                        last = es.es_lblk + es.es_len;
-                        holeoff = (loff_t)last << blkbits;
-                        continue;
-                }
+                set_fs(get_ds());
+                ret = ext4_fiemap(inode, &fie, offset, maxsize - offset);
+                set_fs(old_fs);
+                if (ret)
+                        break;
 
-                /*
-                 * If there is a unwritten extent at this offset,
-                 * it will be as a data or a hole according to page
-                 * cache that has data or not.
-                 */
-                if (map.m_flags & EXT4_MAP_UNWRITTEN) {
-                        int unwritten;
-                        unwritten = ext4_find_unwritten_pgoff(inode, SEEK_HOLE,
-                                                              &map, &holeoff);
-                        if (!unwritten) {
-                                last += ret;
-                                holeoff = (loff_t)last << blkbits;
+                /* No extents found */
+                if (!fie.fi_extents_mapped)
+                        break;
+
+                for (i = 0; i < fie.fi_extents_mapped; i++) {
+                        next = (loff_t)(ext[i].fe_logical + ext[i].fe_length);
+                        /*
+                         * If extent is not unwritten, then it contains valid
+                         * data, mapped or delayed.
+                         */
+                        if (!(ext[i].fe_flags & FIEMAP_EXTENT_UNWRITTEN)) {
+                                if (offset < (loff_t)ext[i].fe_logical)
+                                        goto out;
+                                offset = next;
                                 continue;
                         }
-                }
-
-                /* find a hole */
-                break;
-        } while (last <= end);
+                        /*
+                         * If there is a unwritten extent at this offset,
+                         * it will be as a data or a hole according to page
+                         * cache that has data or not.
+                         */
+                        if (ext4_find_unwritten_pgoff(inode, SEEK_HOLE,
+                                                      next, &offset))
+                                goto out;
 
+                        offset = next;
+                        if (ext[i].fe_flags & FIEMAP_EXTENT_LAST)
+                                goto out;
+                }
+        }
+        if (offset > inode->i_size)
+                offset = inode->i_size;
+out:
         mutex_unlock(&inode->i_mutex);
+        if (ret)
+                return ret;
 
-        if (holeoff > isize)
-                holeoff = isize;
-
-        return vfs_setpos(file, holeoff, maxsize);
+        return vfs_setpos(file, offset, maxsize);
 }
 
 /*