[PATCH v2 2/6] afs: Sort out symlink reading

From: David Howells
Date: Fri Aug 27 2021 - 05:46:14 EST


afs_readpage() doesn't get a file pointer when called for a symlink, so
separate it from regular file pointer handling.

Signed-off-by: David Howells <dhowells@xxxxxxxxxx>
Reviewed-by: Jeff Layton <jlayton@xxxxxxxxxx>
Link: https://lore.kernel.org/r/162687508008.276387.6418924257569297305.stgit@xxxxxxxxxxxxxxxxxxxxxx/ # rfc
Link: https://lore.kernel.org/r/162981152280.1901565.2264055504466731917.stgit@xxxxxxxxxxxxxxxxxxxxxx/
---

fs/afs/file.c | 14 +++++++++-----
fs/afs/inode.c | 6 +++---
fs/afs/internal.h | 3 ++-
3 files changed, 14 insertions(+), 9 deletions(-)

diff --git a/fs/afs/file.c b/fs/afs/file.c
index db035ae2a134..daa9106b9654 100644
--- a/fs/afs/file.c
+++ b/fs/afs/file.c
@@ -19,6 +19,7 @@

static int afs_file_mmap(struct file *file, struct vm_area_struct *vma);
static int afs_readpage(struct file *file, struct page *page);
+static int afs_symlink_readpage(struct file *file, struct page *page);
static void afs_invalidatepage(struct page *page, unsigned int offset,
unsigned int length);
static int afs_releasepage(struct page *page, gfp_t gfp_flags);
@@ -45,7 +46,7 @@ const struct inode_operations afs_file_inode_operations = {
.permission = afs_permission,
};

-const struct address_space_operations afs_fs_aops = {
+const struct address_space_operations afs_file_aops = {
.readpage = afs_readpage,
.readahead = afs_readahead,
.set_page_dirty = afs_set_page_dirty,
@@ -58,6 +59,12 @@ const struct address_space_operations afs_fs_aops = {
.writepages = afs_writepages,
};

+const struct address_space_operations afs_symlink_aops = {
+ .readpage = afs_symlink_readpage,
+ .releasepage = afs_releasepage,
+ .invalidatepage = afs_invalidatepage,
+};
+
static const struct vm_operations_struct afs_vm_ops = {
.fault = filemap_fault,
.map_pages = filemap_map_pages,
@@ -306,7 +313,7 @@ static void afs_req_issue_op(struct netfs_read_subrequest *subreq)
afs_fetch_data(fsreq->vnode, fsreq);
}

-static int afs_symlink_readpage(struct page *page)
+static int afs_symlink_readpage(struct file *file, struct page *page)
{
struct afs_vnode *vnode = AFS_FS_I(page->mapping->host);
struct afs_read *fsreq;
@@ -371,9 +378,6 @@ const struct netfs_read_request_ops afs_req_ops = {

static int afs_readpage(struct file *file, struct page *page)
{
- if (!file)
- return afs_symlink_readpage(page);
-
return netfs_readpage(file, page, &afs_req_ops, NULL);
}

diff --git a/fs/afs/inode.c b/fs/afs/inode.c
index 80b6c8d967d5..0dc71b24859f 100644
--- a/fs/afs/inode.c
+++ b/fs/afs/inode.c
@@ -105,7 +105,7 @@ static int afs_inode_init_from_status(struct afs_operation *op,
inode->i_mode = S_IFREG | (status->mode & S_IALLUGO);
inode->i_op = &afs_file_inode_operations;
inode->i_fop = &afs_file_operations;
- inode->i_mapping->a_ops = &afs_fs_aops;
+ inode->i_mapping->a_ops = &afs_file_aops;
break;
case AFS_FTYPE_DIR:
inode->i_mode = S_IFDIR | (status->mode & S_IALLUGO);
@@ -123,11 +123,11 @@ static int afs_inode_init_from_status(struct afs_operation *op,
inode->i_mode = S_IFDIR | 0555;
inode->i_op = &afs_mntpt_inode_operations;
inode->i_fop = &afs_mntpt_file_operations;
- inode->i_mapping->a_ops = &afs_fs_aops;
+ inode->i_mapping->a_ops = &afs_symlink_aops;
} else {
inode->i_mode = S_IFLNK | status->mode;
inode->i_op = &afs_symlink_inode_operations;
- inode->i_mapping->a_ops = &afs_fs_aops;
+ inode->i_mapping->a_ops = &afs_symlink_aops;
}
inode_nohighmem(inode);
break;
diff --git a/fs/afs/internal.h b/fs/afs/internal.h
index 5ed416f4ff33..beaef0387e85 100644
--- a/fs/afs/internal.h
+++ b/fs/afs/internal.h
@@ -1044,7 +1044,8 @@ extern void afs_dynroot_depopulate(struct super_block *);
/*
* file.c
*/
-extern const struct address_space_operations afs_fs_aops;
+extern const struct address_space_operations afs_file_aops;
+extern const struct address_space_operations afs_symlink_aops;
extern const struct inode_operations afs_file_inode_operations;
extern const struct file_operations afs_file_operations;
extern const struct netfs_read_request_ops afs_req_ops;