[PATCH v2 04/13] f2fs: implement inline tail read & fiemap

[Wu Bo]

Expand the inline data read & fiemap to support inline tail.

Signed-off-by: Wu Bo <bo.wu@xxxxxxxx>
---
 fs/f2fs/data.c   | 31 ++++++++++++++++++++++++++++++-
 fs/f2fs/inline.c | 26 ++++++++++++--------------
 2 files changed, 42 insertions(+), 15 deletions(-)

diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index cd13b5703228..476325a26d4e 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -1922,9 +1922,11 @@ int f2fs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
 	u64 logical = 0, phys = 0, size = 0;
 	u32 flags = 0;
 	int ret = 0;
-	bool compr_cluster = false, compr_appended;
+	bool compr_cluster = false, compr_appended, inline_tail = false;
 	unsigned int cluster_size = F2FS_I(inode)->i_cluster_size;
 	unsigned int count_in_cluster = 0;
+	loff_t i_size = i_size_read(inode);
+	pgoff_t end_index = i_size >> PAGE_SHIFT;
 	loff_t maxbytes;
 
 	if (fieinfo->fi_flags & FIEMAP_FLAG_CACHE) {
@@ -1983,6 +1985,16 @@ int f2fs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
 
 	/* HOLE */
 	if (!compr_cluster && !(map.m_flags & F2FS_MAP_FLAGS)) {
+		/*
+		 * There is a reserved space between address array and inline
+		 * data. So it must meet this hole state before inline data.
+		 */
+		if (f2fs_has_inline_tail(inode) && start_blk == end_index
+				&& f2fs_exist_data(inode)) {
+			inline_tail = true;
+			goto fill_extent;
+		}
+
 		start_blk = next_pgofs;
 
 		if (blks_to_bytes(inode, start_blk) < blks_to_bytes(inode,
@@ -2000,6 +2012,7 @@ int f2fs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
 		goto skip_fill;
 	}
 
+fill_extent:
 	if (size) {
 		flags |= FIEMAP_EXTENT_MERGED;
 		if (IS_ENCRYPTED(inode))
@@ -2013,6 +2026,13 @@ int f2fs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
 		size = 0;
 	}
 
+	if (inline_tail) {
+		start = blks_to_bytes(inode, start_blk);
+		ret = f2fs_inline_data_fiemap(inode, fieinfo, start, len);
+		if (ret != -EAGAIN)
+			goto out;
+	}
+
 	if (start_blk > last_blk)
 		goto out;
 
@@ -2377,6 +2397,8 @@ static int f2fs_mpage_readpages(struct inode *inode,
 #endif
 	unsigned nr_pages = rac ? readahead_count(rac) : 1;
 	unsigned max_nr_pages = nr_pages;
+	loff_t i_size = i_size_read(inode);
+	pgoff_t end_index = i_size >> PAGE_SHIFT;
 	pgoff_t index;
 	int ret = 0;
 
@@ -2397,6 +2419,12 @@ static int f2fs_mpage_readpages(struct inode *inode,
 
 		index = folio_index(folio);
 
+		if (f2fs_has_inline_tail(inode) && index == end_index &&
+				f2fs_exist_data(inode)) {
+			ret = f2fs_read_inline_data(inode, folio);
+			goto out;
+		}
+
 #ifdef CONFIG_F2FS_FS_COMPRESSION
 		if (!f2fs_compressed_file(inode))
 			goto read_single_page;
@@ -2462,6 +2490,7 @@ static int f2fs_mpage_readpages(struct inode *inode,
 		}
 #endif
 	}
+out:
 	if (bio)
 		f2fs_submit_read_bio(F2FS_I_SB(inode), bio, DATA);
 	return ret;
diff --git a/fs/f2fs/inline.c b/fs/f2fs/inline.c
index 2e63e9389fd7..30b18053e784 100644
--- a/fs/f2fs/inline.c
+++ b/fs/f2fs/inline.c
@@ -86,8 +86,6 @@ void f2fs_do_read_inline_data(struct folio *folio, struct page *ipage)
 	if (folio_test_uptodate(folio))
 		return;
 
-	f2fs_bug_on(F2FS_I_SB(inode), folio_index(folio));
-
 	folio_zero_segment(folio, MAX_INLINE_DATA(inode), folio_size(folio));
 
 	/* Copy the whole inline data block */
@@ -126,15 +124,12 @@ int f2fs_read_inline_data(struct inode *inode, struct folio *folio)
 		return PTR_ERR(ipage);
 	}
 
-	if (!f2fs_has_inline_data(inode)) {
+	if (!f2fs_has_inline_data(inode) && !f2fs_has_inline_tail(inode)) {
 		f2fs_put_page(ipage, 1);
 		return -EAGAIN;
 	}
 
-	if (folio_index(folio))
-		folio_zero_segment(folio, 0, folio_size(folio));
-	else
-		f2fs_do_read_inline_data(folio, ipage);
+	f2fs_do_read_inline_data(folio, ipage);
 
 	if (!folio_test_uptodate(folio))
 		folio_mark_uptodate(folio);
@@ -814,7 +809,7 @@ int f2fs_read_inline_dir(struct file *file, struct dir_context *ctx,
 int f2fs_inline_data_fiemap(struct inode *inode,
 		struct fiemap_extent_info *fieinfo, __u64 start, __u64 len)
 {
-	__u64 byteaddr, ilen;
+	__u64 byteaddr, ilen, offset;
 	__u32 flags = FIEMAP_EXTENT_DATA_INLINE | FIEMAP_EXTENT_NOT_ALIGNED |
 		FIEMAP_EXTENT_LAST;
 	struct node_info ni;
@@ -826,7 +821,8 @@ int f2fs_inline_data_fiemap(struct inode *inode,
 		return PTR_ERR(ipage);
 
 	if ((S_ISREG(inode->i_mode) || S_ISLNK(inode->i_mode)) &&
-				!f2fs_has_inline_data(inode)) {
+				!f2fs_has_inline_data(inode) &&
+				!f2fs_has_inline_tail(inode)) {
 		err = -EAGAIN;
 		goto out;
 	}
@@ -836,12 +832,14 @@ int f2fs_inline_data_fiemap(struct inode *inode,
 		goto out;
 	}
 
-	ilen = min_t(size_t, MAX_INLINE_DATA(inode), i_size_read(inode));
-	if (start >= ilen)
+	ilen = min_t(size_t, MAX_INLINE_DATA(inode),
+			i_size_read(inode) & (PAGE_SIZE - 1));
+	offset = start & (PAGE_SIZE - 1);
+	if (offset >= ilen)
 		goto out;
-	if (start + len < ilen)
-		ilen = start + len;
-	ilen -= start;
+	if (offset + len < ilen)
+		ilen = offset + len;
+	ilen -= offset;
 
 	err = f2fs_get_node_info(F2FS_I_SB(inode), inode->i_ino, &ni, false);
 	if (err)
-- 
2.35.3