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switch alloc_file() to passing struct path

Browse source 
... and have the caller grab both mnt and dentry; kill
leak in infiniband, while we are at it.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2009-08-09 00:52:35 +04:00
parent a95161aaa8
commit 2c48b9c455
11 changed files with 78 additions and 63 deletions
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15
arch/ia64/kernel/perfmon.c
View file

@ -2200,7 +2200,7 @@ pfm_alloc_file(pfm_context_t *ctx)
{
struct file *file;
struct inode *inode;
struct dentry *dentry;
struct path path;
char name[32];
struct qstr this;
@ -2225,18 +2225,19 @@ pfm_alloc_file(pfm_context_t *ctx)
/*
* allocate a new dcache entry
*/
dentry = d_alloc(pfmfs_mnt->mnt_sb->s_root, &this);
if (!dentry) {
path.dentry = d_alloc(pfmfs_mnt->mnt_sb->s_root, &this);
if (!path.dentry) {
iput(inode);
return ERR_PTR(-ENOMEM);
}
path.mnt = mntget(pfmfs_mnt);
dentry->d_op = &pfmfs_dentry_operations;
d_add(dentry, inode);
path.dentry->d_op = &pfmfs_dentry_operations;
d_add(path.dentry, inode);
file = alloc_file(pfmfs_mnt, dentry, FMODE_READ, &pfm_file_ops);
file = alloc_file(&path, FMODE_READ, &pfm_file_ops);
if (!file) {
dput(dentry);
path_put(&path);
return ERR_PTR(-ENFILE);
}

9
drivers/infiniband/core/uverbs_main.c
View file

@ -492,6 +492,7 @@ struct file *ib_uverbs_alloc_event_file(struct ib_uverbs_file *uverbs_file,
int is_async, int *fd)
{
struct ib_uverbs_event_file *ev_file;
struct path path;
struct file *filp;
int ret;
@ -519,8 +520,10 @@ struct file *ib_uverbs_alloc_event_file(struct ib_uverbs_file *uverbs_file,
* system call on a uverbs file, which will already have a
* module reference.
*/
filp = alloc_file(uverbs_event_mnt, dget(uverbs_event_mnt->mnt_root),
FMODE_READ, fops_get(&uverbs_event_fops));
path.mnt = uverbs_event_mnt;
path.dentry = uverbs_event_mnt->mnt_root;
path_get(&path);
filp = alloc_file(&path, FMODE_READ, fops_get(&uverbs_event_fops));
if (!filp) {
ret = -ENFILE;
goto err_fd;
@ -531,6 +534,8 @@ struct file *ib_uverbs_alloc_event_file(struct ib_uverbs_file *uverbs_file,
return filp;
err_fd:
fops_put(&uverbs_event_fops);
path_put(&path);
put_unused_fd(*fd);
err:

18
fs/anon_inodes.c
View file

@ -88,7 +88,7 @@ struct file *anon_inode_getfile(const char *name,
void *priv, int flags)
{
struct qstr this;
struct dentry *dentry;
struct path path;
struct file *file;
int error;
@ -106,10 +106,11 @@ struct file *anon_inode_getfile(const char *name,
this.name = name;
this.len = strlen(name);
this.hash = 0;
dentry = d_alloc(anon_inode_mnt->mnt_sb->s_root, &this);
if (!dentry)
path.dentry = d_alloc(anon_inode_mnt->mnt_sb->s_root, &this);
if (!path.dentry)
goto err_module;
path.mnt = mntget(anon_inode_mnt);
/*
* We know the anon_inode inode count is always greater than zero,
* so we can avoid doing an igrab() and we can use an open-coded
@ -117,14 +118,13 @@ struct file *anon_inode_getfile(const char *name,
*/
atomic_inc(&anon_inode_inode->i_count);
dentry->d_op = &anon_inodefs_dentry_operations;
path.dentry->d_op = &anon_inodefs_dentry_operations;
/* Do not publish this dentry inside the global dentry hash table */
dentry->d_flags &= ~DCACHE_UNHASHED;
d_instantiate(dentry, anon_inode_inode);
path.dentry->d_flags &= ~DCACHE_UNHASHED;
d_instantiate(path.dentry, anon_inode_inode);
error = -ENFILE;
file = alloc_file(anon_inode_mnt, dentry,
FMODE_READ | FMODE_WRITE, fops);
file = alloc_file(&path, FMODE_READ | FMODE_WRITE, fops);
if (!file)
goto err_dput;
file->f_mapping = anon_inode_inode->i_mapping;
@ -137,7 +137,7 @@ struct file *anon_inode_getfile(const char *name,
return file;
err_dput:
dput(dentry);
path_put(&path);
err_module:
module_put(fops->owner);
return ERR_PTR(error);

13
fs/file_table.c
View file

@ -162,8 +162,8 @@ fail:
* If all the callers of init_file() are eliminated, its
* code should be moved into this function.
*/
struct file *alloc_file(struct vfsmount *mnt, struct dentry *dentry,
fmode_t mode, const struct file_operations *fop)
struct file *alloc_file(struct path *path, fmode_t mode,
const struct file_operations *fop)
{
struct file *file;
@ -171,9 +171,8 @@ struct file *alloc_file(struct vfsmount *mnt, struct dentry *dentry,
if (!file)
return NULL;
file->f_path.dentry = dentry;
file->f_path.mnt = mntget(mnt);
file->f_mapping = dentry->d_inode->i_mapping;
file->f_path = *path;
file->f_mapping = path->dentry->d_inode->i_mapping;
file->f_mode = mode;
file->f_op = fop;
@ -183,10 +182,10 @@ struct file *alloc_file(struct vfsmount *mnt, struct dentry *dentry,
* visible. We do this for consistency, and so
* that we can do debugging checks at __fput()
*/
if ((mode & FMODE_WRITE) && !special_file(dentry->d_inode->i_mode)) {
if ((mode & FMODE_WRITE) && !special_file(path->dentry->d_inode->i_mode)) {
int error = 0;
file_take_write(file);
error = mnt_clone_write(mnt);
error = mnt_clone_write(path->mnt);
WARN_ON(error);
}
return file;

15
fs/hugetlbfs/inode.c
View file

@ -922,7 +922,8 @@ struct file *hugetlb_file_setup(const char *name, size_t size, int acctflag,
int error = -ENOMEM;
struct file *file;
struct inode *inode;
struct dentry *dentry, *root;
struct path path;
struct dentry *root;
struct qstr quick_string;
*user = NULL;
@ -944,10 +945,11 @@ struct file *hugetlb_file_setup(const char *name, size_t size, int acctflag,
quick_string.name = name;
quick_string.len = strlen(quick_string.name);
quick_string.hash = 0;
dentry = d_alloc(root, &quick_string);
if (!dentry)
path.dentry = d_alloc(root, &quick_string);
if (!path.dentry)
goto out_shm_unlock;
path.mnt = mntget(hugetlbfs_vfsmount);
error = -ENOSPC;
inode = hugetlbfs_get_inode(root->d_sb, current_fsuid(),
current_fsgid(), S_IFREG | S_IRWXUGO, 0);
@ -960,13 +962,12 @@ struct file *hugetlb_file_setup(const char *name, size_t size, int acctflag,
acctflag))
goto out_inode;
d_instantiate(dentry, inode);
d_instantiate(path.dentry, inode);
inode->i_size = size;
inode->i_nlink = 0;
error = -ENFILE;
file = alloc_file(hugetlbfs_vfsmount, dentry,
FMODE_WRITE | FMODE_READ,
file = alloc_file(&path, FMODE_WRITE | FMODE_READ,
&hugetlbfs_file_operations);
if (!file)
goto out_dentry; /* inode is already attached */
@ -977,7 +978,7 @@ struct file *hugetlb_file_setup(const char *name, size_t size, int acctflag,
out_inode:
iput(inode);
out_dentry:
dput(dentry);
path_put(&path);
out_shm_unlock:
if (*user) {
user_shm_unlock(size, *user);

8
fs/notify/inotify/inotify_user.c
View file

@ -646,6 +646,7 @@ SYSCALL_DEFINE1(inotify_init1, int, flags)
struct fsnotify_group *group;
struct user_struct *user;
struct file *filp;
struct path path;
int fd, ret;
/* Check the IN_* constants for consistency. */
@ -675,8 +676,10 @@ SYSCALL_DEFINE1(inotify_init1, int, flags)
atomic_inc(&user->inotify_devs);
filp = alloc_file(inotify_mnt, dget(inotify_mnt->mnt_root),
FMODE_READ, &inotify_fops);
path.mnt = inotify_mnt;
path.dentry = inotify_mnt->mnt_root;
path_get(&path);
filp = alloc_file(&path, FMODE_READ, &inotify_fops);
if (!filp)
goto Enfile;
@ -689,6 +692,7 @@ SYSCALL_DEFINE1(inotify_init1, int, flags)
Enfile:
ret = -ENFILE;
path_put(&path);
atomic_dec(&user->inotify_devs);
out_free_uid:
free_uid(user);

17
fs/pipe.c
View file

@ -974,7 +974,7 @@ struct file *create_write_pipe(int flags)
int err;
struct inode *inode;
struct file *f;
struct dentry *dentry;
struct path path;
struct qstr name = { .name = "" };
err = -ENFILE;
@ -983,21 +983,22 @@ struct file *create_write_pipe(int flags)
goto err;
err = -ENOMEM;
dentry = d_alloc(pipe_mnt->mnt_sb->s_root, &name);
if (!dentry)
path.dentry = d_alloc(pipe_mnt->mnt_sb->s_root, &name);
if (!path.dentry)
goto err_inode;
path.mnt = mntget(pipe_mnt);
dentry->d_op = &pipefs_dentry_operations;
path.dentry->d_op = &pipefs_dentry_operations;
/*
* We dont want to publish this dentry into global dentry hash table.
* We pretend dentry is already hashed, by unsetting DCACHE_UNHASHED
* This permits a working /proc/$pid/fd/XXX on pipes
*/
dentry->d_flags &= ~DCACHE_UNHASHED;
d_instantiate(dentry, inode);
path.dentry->d_flags &= ~DCACHE_UNHASHED;
d_instantiate(path.dentry, inode);
err = -ENFILE;
f = alloc_file(pipe_mnt, dentry, FMODE_WRITE, &write_pipefifo_fops);
f = alloc_file(&path, FMODE_WRITE, &write_pipefifo_fops);
if (!f)
goto err_dentry;
f->f_mapping = inode->i_mapping;
@ -1009,7 +1010,7 @@ struct file *create_write_pipe(int flags)
err_dentry:
free_pipe_info(inode);
dput(dentry);
path_put(&path);
return ERR_PTR(err);
err_inode:

5
include/linux/file.h
View file

@ -18,8 +18,9 @@ extern void drop_file_write_access(struct file *file);
struct file_operations;
struct vfsmount;
struct dentry;
extern struct file *alloc_file(struct vfsmount *, struct dentry *dentry,
fmode_t mode, const struct file_operations *fop);
struct path;
extern struct file *alloc_file(struct path *, fmode_t mode,
const struct file_operations *fop);
static inline void fput_light(struct file *file, int fput_needed)
{

8
ipc/shm.c
View file

@ -878,8 +878,8 @@ long do_shmat(int shmid, char __user *shmaddr, int shmflg, ulong *raddr)
if (err)
goto out_unlock;
path.dentry = dget(shp->shm_file->f_path.dentry);
path.mnt = shp->shm_file->f_path.mnt;
path = shp->shm_file->f_path;
path_get(&path);
shp->shm_nattch++;
size = i_size_read(path.dentry->d_inode);
shm_unlock(shp);
@ -889,7 +889,7 @@ long do_shmat(int shmid, char __user *shmaddr, int shmflg, ulong *raddr)
if (!sfd)
goto out_put_dentry;
file = alloc_file(path.mnt, path.dentry, f_mode,
file = alloc_file(&path, f_mode,
is_file_hugepages(shp->shm_file) ?
&shm_file_operations_huge :
&shm_file_operations);
@ -950,7 +950,7 @@ out_unlock:
out_free:
kfree(sfd);
out_put_dentry:
dput(path.dentry);
path_put(&path);
goto out_nattch;
}

14
mm/shmem.c
View file

@ -2626,7 +2626,8 @@ struct file *shmem_file_setup(const char *name, loff_t size, unsigned long flags
int error;
struct file *file;
struct inode *inode;
struct dentry *dentry, *root;
struct path path;
struct dentry *root;
struct qstr this;
if (IS_ERR(shm_mnt))
@ -2643,16 +2644,17 @@ struct file *shmem_file_setup(const char *name, loff_t size, unsigned long flags
this.len = strlen(name);
this.hash = 0; /* will go */
root = shm_mnt->mnt_root;
dentry = d_alloc(root, &this);
if (!dentry)
path.dentry = d_alloc(root, &this);
if (!path.dentry)
goto put_memory;
path.mnt = mntget(shm_mnt);
error = -ENOSPC;
inode = shmem_get_inode(root->d_sb, S_IFREG | S_IRWXUGO, 0, flags);
if (!inode)
goto put_dentry;
d_instantiate(dentry, inode);
d_instantiate(path.dentry, inode);
inode->i_size = size;
inode->i_nlink = 0; /* It is unlinked */
#ifndef CONFIG_MMU
@ -2662,7 +2664,7 @@ struct file *shmem_file_setup(const char *name, loff_t size, unsigned long flags
#endif
error = -ENFILE;
file = alloc_file(shm_mnt, dentry, FMODE_WRITE | FMODE_READ,
file = alloc_file(&path, FMODE_WRITE | FMODE_READ,
&shmem_file_operations);
if (!file)
goto put_dentry;
@ -2671,7 +2673,7 @@ struct file *shmem_file_setup(const char *name, loff_t size, unsigned long flags
return file;
put_dentry:
dput(dentry);
path_put(&path);
put_memory:
shmem_unacct_size(flags, size);
return ERR_PTR(error);

17
net/socket.c
View file

@ -358,7 +358,7 @@ static const struct dentry_operations sockfs_dentry_operations = {
static int sock_alloc_file(struct socket *sock, struct file **f, int flags)
{
struct qstr name = { .name = "" };
struct dentry *dentry;
struct path path;
struct file *file;
int fd;
@ -366,28 +366,29 @@ static int sock_alloc_file(struct socket *sock, struct file **f, int flags)
if (unlikely(fd < 0))
return fd;
dentry = d_alloc(sock_mnt->mnt_sb->s_root, &name);
if (unlikely(!dentry)) {
path.dentry = d_alloc(sock_mnt->mnt_sb->s_root, &name);
if (unlikely(!path.dentry)) {
put_unused_fd(fd);
return -ENOMEM;
}
path.mnt = mntget(sock_mnt);
dentry->d_op = &sockfs_dentry_operations;
path.dentry->d_op = &sockfs_dentry_operations;
/*
* We dont want to push this dentry into global dentry hash table.
* We pretend dentry is already hashed, by unsetting DCACHE_UNHASHED
* This permits a working /proc/$pid/fd/XXX on sockets
*/
dentry->d_flags &= ~DCACHE_UNHASHED;
d_instantiate(dentry, SOCK_INODE(sock));
path.dentry->d_flags &= ~DCACHE_UNHASHED;
d_instantiate(path.dentry, SOCK_INODE(sock));
SOCK_INODE(sock)->i_fop = &socket_file_ops;
file = alloc_file(sock_mnt, dentry, FMODE_READ | FMODE_WRITE,
file = alloc_file(&path, FMODE_READ | FMODE_WRITE,
&socket_file_ops);
if (unlikely(!file)) {
/* drop dentry, keep inode */
atomic_inc(&path.dentry->d_inode->i_count);
dput(dentry);
path_put(&path);
put_unused_fd(fd);
return -ENFILE;
}