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authorAl Viro <viro@zeniv.linux.org.uk>2015-12-29 15:58:39 -0500
committerAl Viro <viro@zeniv.linux.org.uk>2015-12-30 13:01:03 -0500
commitfceef393a538134f03b778c5d2519e670269342f (patch)
treecd43c9afdc07852d286965ad4d11772f6c275d1a /fs/namei.c
parentcd3417c8fc9504cc1afe944515f338aff9ec286b (diff)
switch ->get_link() to delayed_call, kill ->put_link()
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/namei.c')
-rw-r--r--fs/namei.c63
1 files changed, 26 insertions, 37 deletions
diff --git a/fs/namei.c b/fs/namei.c
index 8f517888c3e1..3c909aebef70 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -505,13 +505,13 @@ struct nameidata {
int total_link_count;
struct saved {
struct path link;
- void *cookie;
+ struct delayed_call done;
const char *name;
- struct inode *inode;
unsigned seq;
} *stack, internal[EMBEDDED_LEVELS];
struct filename *name;
struct nameidata *saved;
+ struct inode *link_inode;
unsigned root_seq;
int dfd;
};
@@ -592,11 +592,8 @@ static void drop_links(struct nameidata *nd)
int i = nd->depth;
while (i--) {
struct saved *last = nd->stack + i;
- struct inode *inode = last->inode;
- if (last->cookie && inode->i_op->put_link) {
- inode->i_op->put_link(inode, last->cookie);
- last->cookie = NULL;
- }
+ do_delayed_call(&last->done);
+ clear_delayed_call(&last->done);
}
}
@@ -858,9 +855,7 @@ void nd_jump_link(struct path *path)
static inline void put_link(struct nameidata *nd)
{
struct saved *last = nd->stack + --nd->depth;
- struct inode *inode = last->inode;
- if (last->cookie && inode->i_op->put_link)
- inode->i_op->put_link(inode, last->cookie);
+ do_delayed_call(&last->done);
if (!(nd->flags & LOOKUP_RCU))
path_put(&last->link);
}
@@ -892,7 +887,7 @@ static inline int may_follow_link(struct nameidata *nd)
return 0;
/* Allowed if owner and follower match. */
- inode = nd->stack[0].inode;
+ inode = nd->link_inode;
if (uid_eq(current_cred()->fsuid, inode->i_uid))
return 0;
@@ -983,7 +978,7 @@ const char *get_link(struct nameidata *nd)
{
struct saved *last = nd->stack + nd->depth - 1;
struct dentry *dentry = last->link.dentry;
- struct inode *inode = last->inode;
+ struct inode *inode = nd->link_inode;
int error;
const char *res;
@@ -1004,23 +999,21 @@ const char *get_link(struct nameidata *nd)
nd->last_type = LAST_BIND;
res = inode->i_link;
if (!res) {
+ const char * (*get)(struct dentry *, struct inode *,
+ struct delayed_call *);
+ get = inode->i_op->get_link;
if (nd->flags & LOOKUP_RCU) {
- res = inode->i_op->get_link(NULL, inode,
- &last->cookie);
+ res = get(NULL, inode, &last->done);
if (res == ERR_PTR(-ECHILD)) {
if (unlikely(unlazy_walk(nd, NULL, 0)))
return ERR_PTR(-ECHILD);
- res = inode->i_op->get_link(dentry, inode,
- &last->cookie);
+ res = get(dentry, inode, &last->done);
}
} else {
- res = inode->i_op->get_link(dentry, inode,
- &last->cookie);
+ res = get(dentry, inode, &last->done);
}
- if (IS_ERR_OR_NULL(res)) {
- last->cookie = NULL;
+ if (IS_ERR_OR_NULL(res))
return res;
- }
}
if (*res == '/') {
if (nd->flags & LOOKUP_RCU) {
@@ -1699,8 +1692,8 @@ static int pick_link(struct nameidata *nd, struct path *link,
last = nd->stack + nd->depth++;
last->link = *link;
- last->cookie = NULL;
- last->inode = inode;
+ clear_delayed_call(&last->done);
+ nd->link_inode = inode;
last->seq = seq;
return 1;
}
@@ -4508,26 +4501,25 @@ EXPORT_SYMBOL(readlink_copy);
*/
int generic_readlink(struct dentry *dentry, char __user *buffer, int buflen)
{
- void *cookie;
+ DEFINE_DELAYED_CALL(done);
struct inode *inode = d_inode(dentry);
const char *link = inode->i_link;
int res;
if (!link) {
- link = inode->i_op->get_link(dentry, inode, &cookie);
+ link = inode->i_op->get_link(dentry, inode, &done);
if (IS_ERR(link))
return PTR_ERR(link);
}
res = readlink_copy(buffer, buflen, link);
- if (inode->i_op->put_link)
- inode->i_op->put_link(inode, cookie);
+ do_delayed_call(&done);
return res;
}
EXPORT_SYMBOL(generic_readlink);
/* get the link contents into pagecache */
const char *page_get_link(struct dentry *dentry, struct inode *inode,
- void **cookie)
+ struct delayed_call *callback)
{
char *kaddr;
struct page *page;
@@ -4546,7 +4538,7 @@ const char *page_get_link(struct dentry *dentry, struct inode *inode,
if (IS_ERR(page))
return (char*)page;
}
- *cookie = page;
+ set_delayed_call(callback, page_put_link, page);
BUG_ON(mapping_gfp_mask(mapping) & __GFP_HIGHMEM);
kaddr = page_address(page);
nd_terminate_link(kaddr, inode->i_size, PAGE_SIZE - 1);
@@ -4555,21 +4547,19 @@ const char *page_get_link(struct dentry *dentry, struct inode *inode,
EXPORT_SYMBOL(page_get_link);
-void page_put_link(struct inode *unused, void *cookie)
+void page_put_link(void *arg)
{
- struct page *page = cookie;
- page_cache_release(page);
+ put_page(arg);
}
EXPORT_SYMBOL(page_put_link);
int page_readlink(struct dentry *dentry, char __user *buffer, int buflen)
{
- void *cookie = NULL;
+ DEFINE_DELAYED_CALL(done);
int res = readlink_copy(buffer, buflen,
page_get_link(dentry, d_inode(dentry),
- &cookie));
- if (cookie)
- page_put_link(NULL, cookie);
+ &done));
+ do_delayed_call(&done);
return res;
}
EXPORT_SYMBOL(page_readlink);
@@ -4619,6 +4609,5 @@ EXPORT_SYMBOL(page_symlink);
const struct inode_operations page_symlink_inode_operations = {
.readlink = generic_readlink,
.get_link = page_get_link,
- .put_link = page_put_link,
};
EXPORT_SYMBOL(page_symlink_inode_operations);