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authorJeff Layton <jlayton@redhat.com>2012-10-10 15:25:28 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2012-10-12 20:14:55 -0400
commit91a27b2a756784714e924e5e854b919273082d26 (patch)
tree3913246b7d6e62703ec915f481e3a7159393f0f0 /mm/swapfile.c
parent8e377d15078a501c4da98471f56396343c407d92 (diff)
downloadlinux-91a27b2a756784714e924e5e854b919273082d26.tar.gz
vfs: define struct filename and have getname() return it
getname() is intended to copy pathname strings from userspace into a kernel buffer. The result is just a string in kernel space. It would however be quite helpful to be able to attach some ancillary info to the string. For instance, we could attach some audit-related info to reduce the amount of audit-related processing needed. When auditing is enabled, we could also call getname() on the string more than once and not need to recopy it from userspace. This patchset converts the getname()/putname() interfaces to return a struct instead of a string. For now, the struct just tracks the string in kernel space and the original userland pointer for it. Later, we'll add other information to the struct as it becomes convenient. Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'mm/swapfile.c')
-rw-r--r--mm/swapfile.c11
1 files changed, 5 insertions, 6 deletions
diff --git a/mm/swapfile.c b/mm/swapfile.c
index 14e254c768f..90d2ed591de 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -1483,7 +1483,7 @@ SYSCALL_DEFINE1(swapoff, const char __user *, specialfile)
struct file *swap_file, *victim;
struct address_space *mapping;
struct inode *inode;
- char *pathname;
+ struct filename *pathname;
int oom_score_adj;
int i, type, prev;
int err;
@@ -1498,8 +1498,7 @@ SYSCALL_DEFINE1(swapoff, const char __user *, specialfile)
if (IS_ERR(pathname))
goto out;
- victim = filp_open(pathname, O_RDWR|O_LARGEFILE, 0);
- putname(pathname);
+ victim = filp_open(pathname->name, O_RDWR|O_LARGEFILE, 0);
err = PTR_ERR(victim);
if (IS_ERR(victim))
goto out;
@@ -1936,7 +1935,7 @@ static int setup_swap_map_and_extents(struct swap_info_struct *p,
SYSCALL_DEFINE2(swapon, const char __user *, specialfile, int, swap_flags)
{
struct swap_info_struct *p;
- char *name;
+ struct filename *name;
struct file *swap_file = NULL;
struct address_space *mapping;
int i;
@@ -1967,7 +1966,7 @@ SYSCALL_DEFINE2(swapon, const char __user *, specialfile, int, swap_flags)
name = NULL;
goto bad_swap;
}
- swap_file = filp_open(name, O_RDWR|O_LARGEFILE, 0);
+ swap_file = filp_open(name->name, O_RDWR|O_LARGEFILE, 0);
if (IS_ERR(swap_file)) {
error = PTR_ERR(swap_file);
swap_file = NULL;
@@ -2053,7 +2052,7 @@ SYSCALL_DEFINE2(swapon, const char __user *, specialfile, int, swap_flags)
printk(KERN_INFO "Adding %uk swap on %s. "
"Priority:%d extents:%d across:%lluk %s%s%s\n",
- p->pages<<(PAGE_SHIFT-10), name, p->prio,
+ p->pages<<(PAGE_SHIFT-10), name->name, p->prio,
nr_extents, (unsigned long long)span<<(PAGE_SHIFT-10),
(p->flags & SWP_SOLIDSTATE) ? "SS" : "",
(p->flags & SWP_DISCARDABLE) ? "D" : "",