Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Pull vfs update from Al Viro:
- big one - consolidation of descriptor-related logics; almost all of
that is moved to fs/file.c
(BTW, I'm seriously tempted to rename the result to fd.c. As it is,
we have a situation when file_table.c is about handling of struct
file and file.c is about handling of descriptor tables; the reasons
are historical - file_table.c used to be about a static array of
struct file we used to have way back).
A lot of stray ends got cleaned up and converted to saner primitives,
disgusting mess in android/binder.c is still disgusting, but at least
doesn't poke so much in descriptor table guts anymore. A bunch of
relatively minor races got fixed in process, plus an ext4 struct file
leak.
- related thing - fget_light() partially unuglified; see fdget() in
there (and yes, it generates the code as good as we used to have).
- also related - bits of Cyrill's procfs stuff that got entangled into
that work; _not_ all of it, just the initial move to fs/proc/fd.c and
switch of fdinfo to seq_file.
- Alex's fs/coredump.c spiltoff - the same story, had been easier to
take that commit than mess with conflicts. The rest is a separate
pile, this was just a mechanical code movement.
- a few misc patches all over the place. Not all for this cycle,
there'll be more (and quite a few currently sit in akpm's tree)."
Fix up trivial conflicts in the android binder driver, and some fairly
simple conflicts due to two different changes to the sock_alloc_file()
interface ("take descriptor handling from sock_alloc_file() to callers"
vs "net: Providing protocol type via system.sockprotoname xattr of
/proc/PID/fd entries" adding a dentry name to the socket)
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: (72 commits)
MAX_LFS_FILESIZE should be a loff_t
compat: fs: Generic compat_sys_sendfile implementation
fs: push rcu_barrier() from deactivate_locked_super() to filesystems
btrfs: reada_extent doesn't need kref for refcount
coredump: move core dump functionality into its own file
coredump: prevent double-free on an error path in core dumper
usb/gadget: fix misannotations
fcntl: fix misannotations
ceph: don't abuse d_delete() on failure exits
hypfs: ->d_parent is never NULL or negative
vfs: delete surplus inode NULL check
switch simple cases of fget_light to fdget
new helpers: fdget()/fdput()
switch o2hb_region_dev_write() to fget_light()
proc_map_files_readdir(): don't bother with grabbing files
make get_file() return its argument
vhost_set_vring(): turn pollstart/pollstop into bool
switch prctl_set_mm_exe_file() to fget_light()
switch xfs_find_handle() to fget_light()
switch xfs_swapext() to fget_light()
...
diff --git a/net/socket.c b/net/socket.c
index 80dc7e8..d92c490 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -347,17 +347,11 @@
* but we take care of internal coherence yet.
*/
-static int sock_alloc_file(struct socket *sock, struct file **f, int flags,
- const char *dname)
+struct file *sock_alloc_file(struct socket *sock, int flags, const char *dname)
{
struct qstr name = { .name = "" };
struct path path;
struct file *file;
- int fd;
-
- fd = get_unused_fd_flags(flags);
- if (unlikely(fd < 0))
- return fd;
if (dname) {
name.name = dname;
@@ -367,10 +361,8 @@
name.len = strlen(name.name);
}
path.dentry = d_alloc_pseudo(sock_mnt->mnt_sb, &name);
- if (unlikely(!path.dentry)) {
- put_unused_fd(fd);
- return -ENOMEM;
- }
+ if (unlikely(!path.dentry))
+ return ERR_PTR(-ENOMEM);
path.mnt = mntget(sock_mnt);
d_instantiate(path.dentry, SOCK_INODE(sock));
@@ -382,30 +374,33 @@
/* drop dentry, keep inode */
ihold(path.dentry->d_inode);
path_put(&path);
- put_unused_fd(fd);
- return -ENFILE;
+ return ERR_PTR(-ENFILE);
}
sock->file = file;
file->f_flags = O_RDWR | (flags & O_NONBLOCK);
file->f_pos = 0;
file->private_data = sock;
-
- *f = file;
- return fd;
+ return file;
}
+EXPORT_SYMBOL(sock_alloc_file);
-int sock_map_fd(struct socket *sock, int flags)
+static int sock_map_fd(struct socket *sock, int flags)
{
struct file *newfile;
- int fd = sock_alloc_file(sock, &newfile, flags, NULL);
+ int fd = get_unused_fd_flags(flags);
+ if (unlikely(fd < 0))
+ return fd;
- if (likely(fd >= 0))
+ newfile = sock_alloc_file(sock, flags, NULL);
+ if (likely(!IS_ERR(newfile))) {
fd_install(fd, newfile);
+ return fd;
+ }
- return fd;
+ put_unused_fd(fd);
+ return PTR_ERR(newfile);
}
-EXPORT_SYMBOL(sock_map_fd);
struct socket *sock_from_file(struct file *file, int *err)
{
@@ -1466,17 +1461,32 @@
if (err < 0)
goto out_release_both;
- fd1 = sock_alloc_file(sock1, &newfile1, flags, NULL);
+ fd1 = get_unused_fd_flags(flags);
if (unlikely(fd1 < 0)) {
err = fd1;
goto out_release_both;
}
-
- fd2 = sock_alloc_file(sock2, &newfile2, flags, NULL);
+ fd2 = get_unused_fd_flags(flags);
if (unlikely(fd2 < 0)) {
err = fd2;
+ put_unused_fd(fd1);
+ goto out_release_both;
+ }
+
+ newfile1 = sock_alloc_file(sock1, flags, NULL);
+ if (unlikely(IS_ERR(newfile1))) {
+ err = PTR_ERR(newfile1);
+ put_unused_fd(fd1);
+ put_unused_fd(fd2);
+ goto out_release_both;
+ }
+
+ newfile2 = sock_alloc_file(sock2, flags, NULL);
+ if (IS_ERR(newfile2)) {
+ err = PTR_ERR(newfile2);
fput(newfile1);
put_unused_fd(fd1);
+ put_unused_fd(fd2);
sock_release(sock2);
goto out;
}
@@ -1608,13 +1618,19 @@
*/
__module_get(newsock->ops->owner);
- newfd = sock_alloc_file(newsock, &newfile, flags,
- sock->sk->sk_prot_creator->name);
+ newfd = get_unused_fd_flags(flags);
if (unlikely(newfd < 0)) {
err = newfd;
sock_release(newsock);
goto out_put;
}
+ newfile = sock_alloc_file(newsock, flags, sock->sk->sk_prot_creator->name);
+ if (unlikely(IS_ERR(newfile))) {
+ err = PTR_ERR(newfile);
+ put_unused_fd(newfd);
+ sock_release(newsock);
+ goto out_put;
+ }
err = security_socket_accept(sock, newsock);
if (err)