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authorAl Viro <viro@zeniv.linux.org.uk>2015-05-02 13:32:22 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2015-05-10 22:19:45 -0400
commit680baacbca69d18a6d7315374ad83d05ac9c0977 (patch)
treea69822ef5234d4a308b780ff51c5d9b77bd3a89b /fs/fuse
parent46afd6f61cc33ae4b3a2aed4bb454d11d4114c27 (diff)
downloadlinux-680baacbca69d18a6d7315374ad83d05ac9c0977.tar.bz2
new ->follow_link() and ->put_link() calling conventions
a) instead of storing the symlink body (via nd_set_link()) and returning an opaque pointer later passed to ->put_link(), ->follow_link() _stores_ that opaque pointer (into void * passed by address by caller) and returns the symlink body. Returning ERR_PTR() on error, NULL on jump (procfs magic symlinks) and pointer to symlink body for normal symlinks. Stored pointer is ignored in all cases except the last one. Storing NULL for opaque pointer (or not storing it at all) means no call of ->put_link(). b) the body used to be passed to ->put_link() implicitly (via nameidata). Now only the opaque pointer is. In the cases when we used the symlink body to free stuff, ->follow_link() now should store it as opaque pointer in addition to returning it. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/fuse')
-rw-r--r--fs/fuse/dir.c19
1 files changed, 4 insertions, 15 deletions
diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c
index 0572bca49f15..f9cb260375cf 100644
--- a/fs/fuse/dir.c
+++ b/fs/fuse/dir.c
@@ -1365,7 +1365,7 @@ static int fuse_readdir(struct file *file, struct dir_context *ctx)
return err;
}
-static char *read_link(struct dentry *dentry)
+static const char *fuse_follow_link(struct dentry *dentry, void **cookie, struct nameidata *nd)
{
struct inode *inode = d_inode(dentry);
struct fuse_conn *fc = get_fuse_conn(inode);
@@ -1389,26 +1389,15 @@ static char *read_link(struct dentry *dentry)
link = ERR_PTR(ret);
} else {
link[ret] = '\0';
+ *cookie = link;
}
fuse_invalidate_atime(inode);
return link;
}
-static void free_link(char *link)
+static void fuse_put_link(struct dentry *dentry, void *cookie)
{
- if (!IS_ERR(link))
- free_page((unsigned long) link);
-}
-
-static void *fuse_follow_link(struct dentry *dentry, struct nameidata *nd)
-{
- nd_set_link(nd, read_link(dentry));
- return NULL;
-}
-
-static void fuse_put_link(struct dentry *dentry, struct nameidata *nd, void *c)
-{
- free_link(nd_get_link(nd));
+ free_page((unsigned long) cookie);
}
static int fuse_dir_open(struct inode *inode, struct file *file)