f2fs: support FIEMAP_FLAG_XATTR

This patch enables ->fiemap to handle FIEMAP_FLAG_XATTR flag for xattr
mapping info lookup purpose.

It makes f2fs passing generic/425 test in fstest.

Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

1 files changed, 68 insertions, 1 deletions

diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 664fe0aa18bb..cde2a3264b4c 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -1140,6 +1140,68 @@ static inline loff_t blk_to_logical(struct inode *inode, sector_t blk)
         return (blk << inode->i_blkbits);
 }
 
+static int f2fs_xattr_fiemap(struct inode *inode,
+                                struct fiemap_extent_info *fieinfo)
+{
+        struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
+        struct page *page;
+        struct node_info ni;
+        __u64 phys = 0, len;
+        __u32 flags;
+        nid_t xnid = F2FS_I(inode)->i_xattr_nid;
+        int err = 0;
+
+        if (f2fs_has_inline_xattr(inode)) {
+                int offset;
+
+                page = f2fs_grab_cache_page(NODE_MAPPING(sbi),
+                                                inode->i_ino, false);
+                if (!page)
+                        return -ENOMEM;
+
+                get_node_info(sbi, inode->i_ino, &ni);
+
+                phys = (__u64)blk_to_logical(inode, ni.blk_addr);
+                offset = offsetof(struct f2fs_inode, i_addr) +
+                                        sizeof(__le32) * (DEF_ADDRS_PER_INODE -
+                                        F2FS_INLINE_XATTR_ADDRS(inode));
+
+                phys += offset;
+                len = inline_xattr_size(inode);
+
+                f2fs_put_page(page, 1);
+
+                flags = FIEMAP_EXTENT_DATA_INLINE | FIEMAP_EXTENT_NOT_ALIGNED;
+
+                if (!xnid)
+                        flags |= FIEMAP_EXTENT_LAST;
+
+                err = fiemap_fill_next_extent(fieinfo, 0, phys, len, flags);
+                if (err || err == 1)
+                        return err;
+        }
+
+        if (xnid) {
+                page = f2fs_grab_cache_page(NODE_MAPPING(sbi), xnid, false);
+                if (!page)
+                        return -ENOMEM;
+
+                get_node_info(sbi, xnid, &ni);
+
+                phys = (__u64)blk_to_logical(inode, ni.blk_addr);
+                len = inode->i_sb->s_blocksize;
+
+                f2fs_put_page(page, 1);
+
+                flags = FIEMAP_EXTENT_LAST;
+        }
+
+        if (phys)
+                err = fiemap_fill_next_extent(fieinfo, 0, phys, len, flags);
+
+        return (err < 0 ? err : 0);
+}
+
 int f2fs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
                 u64 start, u64 len)
 {
@@ -1150,12 +1212,17 @@ int f2fs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
         u32 flags = 0;
         int ret = 0;
 
-        ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
+        ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC | FIEMAP_FLAG_XATTR);
         if (ret)
                 return ret;
 
         inode_lock(inode);
 
+        if (fieinfo->fi_flags & FIEMAP_FLAG_XATTR) {
+                ret = f2fs_xattr_fiemap(inode, fieinfo);
+                goto out;
+        }
+
         if (f2fs_has_inline_data(inode)) {
                 ret = f2fs_inline_data_fiemap(inode, fieinfo, start, len);
                 if (ret != -EAGAIN)