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namei: page_getlink() and page_follow_link_light() are the same thing

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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2015-11-16 18:26:34 -05:00
parent 9cdce3c074
commit aa80deab33
1 changed files with 13 additions and 19 deletions
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32
fs/namei.c
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@ -4518,7 +4518,7 @@ int generic_readlink(struct dentry *dentry, char __user *buffer, int buflen)
EXPORT_SYMBOL(generic_readlink);
/* get the link contents into pagecache */
static char *page_getlink(struct dentry * dentry, struct page **ppage)
static const char *page_getlink(struct dentry * dentry, void **cookie)
{
char *kaddr;
struct page *page;
@ -4526,31 +4526,15 @@ static char *page_getlink(struct dentry * dentry, struct page **ppage)
page = read_mapping_page(mapping, 0, NULL);
if (IS_ERR(page))
return (char*)page;
*ppage = page;
*cookie = page;
kaddr = kmap(page);
nd_terminate_link(kaddr, dentry->d_inode->i_size, PAGE_SIZE - 1);
return kaddr;
}
int page_readlink(struct dentry *dentry, char __user *buffer, int buflen)
{
struct page *page = NULL;
int res = readlink_copy(buffer, buflen, page_getlink(dentry, &page));
if (page) {
kunmap(page);
page_cache_release(page);
}
return res;
}
EXPORT_SYMBOL(page_readlink);
const char *page_follow_link_light(struct dentry *dentry, void **cookie)
{
struct page *page = NULL;
char *res = page_getlink(dentry, &page);
if (!IS_ERR(res))
*cookie = page;
return res;
return page_getlink(dentry, cookie);
}
EXPORT_SYMBOL(page_follow_link_light);
@ -4562,6 +4546,16 @@ void page_put_link(struct inode *unused, void *cookie)
}
EXPORT_SYMBOL(page_put_link);
int page_readlink(struct dentry *dentry, char __user *buffer, int buflen)
{
void *cookie = NULL;
int res = readlink_copy(buffer, buflen, page_getlink(dentry, &cookie));
if (cookie)
page_put_link(NULL, cookie);
return res;
}
EXPORT_SYMBOL(page_readlink);
/*
* The nofs argument instructs pagecache_write_begin to pass AOP_FLAG_NOFS
*/