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-rw-r--r--fs/ext4/file.c220
1 files changed, 106 insertions, 114 deletions
diff --git a/fs/ext4/file.c b/fs/ext4/file.c
index 8131be8c0af..513c12cf444 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);
}
/*
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-11-11 08:36:00 +0000