Mappings which implement writepages should not implement writepage
as it can only harm writeback patterns.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

This reverts commit 94c821fb286b545d37549ff30a0c341e066f0d6c.

It reports that there is potential corruption in node footer,
the most suspious feature is nat_bits, let's revert recovery
related code.

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

To simulate inconsistent node footer error.

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

This patch introduces a new wrapper f2fs_get_xnode_page(), then, caller
can use it to load xattr block to page cache, meanwhile it will do sanity
check on xattr node footer.

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

This patch introduces a new wrapper f2fs_get_inode_page(), then, caller
can use it to load inode block to page cache, meanwhile it will do sanity
check on inode footer.

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

Introduce a new mount option "nat_bits" to control nat_bits feature,
by default nat_bits feature is disabled.

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

Use f2fs_get_node_folio() to get a folio and use it throughout.  Remove a
few calls to compound_head() and a reference to page->mapping.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

Change __get_node_page() to return a folio and convert back to a page in
f2fs_get_node_page() and f2fs_get_node_page_ra().

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

All its callers now have access to a folio, so pass it in.  Removes
an access to page->mapping.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

Retrieve a folio from the page cache and use it throughout.  Saves six
hidden calls to compound_head() and removes a reference to page->mapping.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>