ext4: let fiemap work with inline data
fiemap is used to find the disk layout of a file, as for inline data,
let us just pretend like a file with just one extent.
Signed-off-by: Tao Ma <boyu.mt@taobao.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index f2659f5..70dc6fc 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -4802,6 +4802,15 @@
ext4_lblk_t start_blk;
int error = 0;
+ if (ext4_has_inline_data(inode)) {
+ int has_inline = 1;
+
+ error = ext4_inline_data_fiemap(inode, fieinfo, &has_inline);
+
+ if (has_inline)
+ return error;
+ }
+
/* fallback to generic here if not in extents fmt */
if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)))
return generic_block_fiemap(inode, fieinfo, start, len,
diff --git a/fs/ext4/inline.c b/fs/ext4/inline.c
index fc36299..bf5f778 100644
--- a/fs/ext4/inline.c
+++ b/fs/ext4/inline.c
@@ -15,6 +15,7 @@
#include "ext4.h"
#include "xattr.h"
#include "truncate.h"
+#include <linux/fiemap.h>
#define EXT4_XATTR_SYSTEM_DATA "data"
#define EXT4_MIN_INLINE_DATA_SIZE ((sizeof(__le32) * EXT4_N_BLOCKS))
@@ -1680,3 +1681,37 @@
return ret;
}
+
+int ext4_inline_data_fiemap(struct inode *inode,
+ struct fiemap_extent_info *fieinfo,
+ int *has_inline)
+{
+ __u64 physical = 0;
+ __u64 length;
+ __u32 flags = FIEMAP_EXTENT_DATA_INLINE | FIEMAP_EXTENT_LAST;
+ int error = 0;
+ struct ext4_iloc iloc;
+
+ down_read(&EXT4_I(inode)->xattr_sem);
+ if (!ext4_has_inline_data(inode)) {
+ *has_inline = 0;
+ goto out;
+ }
+
+ error = ext4_get_inode_loc(inode, &iloc);
+ if (error)
+ goto out;
+
+ physical = iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits;
+ physical += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data;
+ physical += offsetof(struct ext4_inode, i_block);
+ length = i_size_read(inode);
+
+ if (physical)
+ error = fiemap_fill_next_extent(fieinfo, 0, physical,
+ length, flags);
+ brelse(iloc.bh);
+out:
+ up_read(&EXT4_I(inode)->xattr_sem);
+ return (error < 0 ? error : 0);
+}
diff --git a/fs/ext4/xattr.h b/fs/ext4/xattr.h
index f6c3ca6..5c7e55e 100644
--- a/fs/ext4/xattr.h
+++ b/fs/ext4/xattr.h
@@ -184,6 +184,9 @@
extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
struct ext4_dir_entry_2 **parent_de,
int *retval);
+extern int ext4_inline_data_fiemap(struct inode *inode,
+ struct fiemap_extent_info *fieinfo,
+ int *has_inline);
# else /* CONFIG_EXT4_FS_XATTR */
static inline int
@@ -398,6 +401,13 @@
{
return NULL;
}
+
+static inline int ext4_inline_data_fiemap(struct inode *inode,
+ struct fiemap_extent_info *fieinfo,
+ int *has_inline)
+{
+ return 0;
+}
# endif /* CONFIG_EXT4_FS_XATTR */
#ifdef CONFIG_EXT4_FS_SECURITY