replace ->follow_link() with new method that could stay in RCU mode
new method: ->get_link(); replacement of ->follow_link(). The differences
are:
* inode and dentry are passed separately
* might be called both in RCU and non-RCU mode;
the former is indicated by passing it a NULL dentry.
* when called that way it isn't allowed to block
and should return ERR_PTR(-ECHILD) if it needs to be called
in non-RCU mode.
It's a flagday change - the old method is gone, all in-tree instances
converted. Conversion isn't hard; said that, so far very few instances
do not immediately bail out when called in RCU mode. That'll change
in the next commits.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/f2fs/namei.c b/fs/f2fs/namei.c
index 484df68..2a8d84b7 100644
--- a/fs/f2fs/namei.c
+++ b/fs/f2fs/namei.c
@@ -315,9 +315,10 @@
return err;
}
-static const char *f2fs_follow_link(struct dentry *dentry, void **cookie)
+static const char *f2fs_get_link(struct dentry *dentry,
+ struct inode *inode, void **cookie)
{
- const char *link = page_follow_link_light(dentry, cookie);
+ const char *link = page_get_link(dentry, inode, cookie);
if (!IS_ERR(link) && !*link) {
/* this is broken symlink case */
page_put_link(NULL, *cookie);
@@ -924,18 +925,21 @@
}
#ifdef CONFIG_F2FS_FS_ENCRYPTION
-static const char *f2fs_encrypted_follow_link(struct dentry *dentry, void **cookie)
+static const char *f2fs_encrypted_get_link(struct dentry *dentry,
+ struct inode *inode, void **cookie)
{
struct page *cpage = NULL;
char *caddr, *paddr = NULL;
struct f2fs_str cstr;
struct f2fs_str pstr = FSTR_INIT(NULL, 0);
- struct inode *inode = d_inode(dentry);
struct f2fs_encrypted_symlink_data *sd;
loff_t size = min_t(loff_t, i_size_read(inode), PAGE_SIZE - 1);
u32 max_size = inode->i_sb->s_blocksize;
int res;
+ if (!dentry)
+ return ERR_PTR(-ECHILD);
+
res = f2fs_get_encryption_info(inode);
if (res)
return ERR_PTR(res);
@@ -994,7 +998,7 @@
const struct inode_operations f2fs_encrypted_symlink_inode_operations = {
.readlink = generic_readlink,
- .follow_link = f2fs_encrypted_follow_link,
+ .get_link = f2fs_encrypted_get_link,
.put_link = kfree_put_link,
.getattr = f2fs_getattr,
.setattr = f2fs_setattr,
@@ -1030,7 +1034,7 @@
const struct inode_operations f2fs_symlink_inode_operations = {
.readlink = generic_readlink,
- .follow_link = f2fs_follow_link,
+ .get_link = f2fs_get_link,
.put_link = page_put_link,
.getattr = f2fs_getattr,
.setattr = f2fs_setattr,