This is the equivalent of page_symlink() but takes a
buffered_write_operations structure. It also doesn't handle GFP_NOFS
for you; if you need that, use memalloc_nofs_save() yourself.
Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
---
fs/namei.c | 25 +++++++++++++++++++++++++
include/linux/pagemap.h | 2 ++
2 files changed, 27 insertions(+)
diff --git a/fs/namei.c b/fs/namei.c
index 37fb0a8aa09a..4352206b0408 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -5255,6 +5255,31 @@ int page_symlink(struct inode *inode, const char *symname, int len)
}
EXPORT_SYMBOL(page_symlink);
+int filemap_symlink(struct inode *inode, const char *symname, int len,
+ const struct buffered_write_operations *ops, void **fsdata)
+{
+ struct address_space *mapping = inode->i_mapping;
+ struct folio *folio;
+ int err;
+
+retry:
+ folio = ops->write_begin(NULL, mapping, 0, len-1, fsdata);
+ if (IS_ERR(folio))
+ return PTR_ERR(folio);
+
+ memcpy(folio_address(folio), symname, len-1);
+
+ err = ops->write_end(NULL, mapping, 0, len-1, len-1, folio, fsdata);
+ if (err < 0)
+ return err;
+ if (err < len-1)
+ goto retry;
+
+ mark_inode_dirty(inode);
+ return 0;
+}
+EXPORT_SYMBOL(filemap_symlink);
+
const struct inode_operations page_symlink_inode_operations = {
.get_link = page_get_link,
};
diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index 2921c1cc6335..a7540f757368 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -39,6 +39,8 @@ ssize_t generic_file_write_iter(struct kiocb *, struct iov_iter *);
#define __generic_file_write_iter(kiocb, iter) \
__filemap_write_iter(kiocb, iter, NULL, NULL)
+int filemap_symlink(struct inode *inode, const char *symname, int len,
+ const struct buffered_write_operations *bw, void **fsdata);
unsigned long invalidate_mapping_pages(struct address_space *mapping,
pgoff_t start, pgoff_t end);
--
2.43.0
