File locking related changes for v4.14
-----BEGIN PGP SIGNATURE----- iQIcBAABAgAGBQJZrTzyAAoJEAAOaEEZVoIVj8wP/0sOxG+7vEEpe4uj2W52aq9T Y39/ZLfRTLm9SqgH61lkN+IyUsvDx+IP1ws2LBhp0IDRD9m40wdILhHZRWXJcRW2 ApEfmXF+rxnZZ6725ixX9w4Ylab2ZeGmKbzaG4wIjxfddftewZkJvFQcb1LZDfWq 1N0SF4KWoWN6t26Du5CHmYSj/Sz6YGrWGhF22u3mNfkGL+MmuKbz+kB3W+0q2NUF ZjkOIH9WcRiXgSlcHPBLre2EKHqHaNgb0s4Iofd3ZEe50v1NwY/vBMefxuwRdgKS kpLhIKIYMawrHn2rpV0jm12qdgCYj+t2kbVIUBDn3unBP2zYA0e/oo5HNIrroVlk Q6aGwmW0LN60rpd5qcRuNS1p1h2id2HpxEe98dsski6T8CVnj/nvu7EIxmWM02cf g2HeOd7bnl3+uu7SwSTkOVb6G7Kjn+Xufiz/n11mK6fl2jvOyWZZmDqhhjWAYJ8r t5mQVWJdEV12+6+A1WSv9DeS3TUgdYPCF8dzDtF+JVn3WEmxYHywH36Y3hKKz+BA gFEhnHvlyaVvpXCr8Y5BqNSfEfvZe/YUnmVReHpgBU/U4GJ17iQYk/g2vfmPLmsN IZ2OGCrDUc/LfdWc4llRyQBvlGT1KujaT0tbN7xnuWcS2qWdsfX4jDtDUH9E6pvK TB6Sw4Ike0ixamG8N8q/ =VPMU -----END PGP SIGNATURE----- Merge tag 'locks-v4.14-1' of git://git.kernel.org/pub/scm/linux/kernel/git/jlayton/linux Pull file locking updates from Jeff Layton: "This pile just has a few file locking fixes from Ben Coddington. There are a couple of cleanup patches + an attempt to bring sanity to the l_pid value that is reported back to userland on an F_GETLK request. After a few gyrations, he came up with a way for filesystems to communicate to the VFS layer code whether the pid should be translated according to the namespace or presented as-is to userland" * tag 'locks-v4.14-1' of git://git.kernel.org/pub/scm/linux/kernel/git/jlayton/linux: locks: restore a warn for leaked locks on close fs/locks: Remove fl_nspid and use fs-specific l_pid for remote locks fs/locks: Use allocation rather than the stack in fcntl_getlk()
This commit is contained in:
commit
066dea8c30
|
@ -596,7 +596,7 @@ granted:
|
|||
default:
|
||||
getlk->fl_type = F_UNLCK;
|
||||
}
|
||||
getlk->fl_pid = (pid_t)lock->l_policy_data.l_flock.pid;
|
||||
getlk->fl_pid = -(pid_t)lock->l_policy_data.l_flock.pid;
|
||||
getlk->fl_start = (loff_t)lock->l_policy_data.l_flock.start;
|
||||
getlk->fl_end = (loff_t)lock->l_policy_data.l_flock.end;
|
||||
} else {
|
||||
|
|
|
@ -288,7 +288,7 @@ static int v9fs_file_getlock(struct file *filp, struct file_lock *fl)
|
|||
fl->fl_end = OFFSET_MAX;
|
||||
else
|
||||
fl->fl_end = glock.start + glock.length - 1;
|
||||
fl->fl_pid = glock.proc_id;
|
||||
fl->fl_pid = -glock.proc_id;
|
||||
}
|
||||
kfree(glock.client_id);
|
||||
return res;
|
||||
|
|
|
@ -79,7 +79,7 @@ static int ceph_lock_message(u8 lock_type, u16 operation, struct file *file,
|
|||
err = ceph_mdsc_do_request(mdsc, inode, req);
|
||||
|
||||
if (operation == CEPH_MDS_OP_GETFILELOCK) {
|
||||
fl->fl_pid = le64_to_cpu(req->r_reply_info.filelock_reply->pid);
|
||||
fl->fl_pid = -le64_to_cpu(req->r_reply_info.filelock_reply->pid);
|
||||
if (CEPH_LOCK_SHARED == req->r_reply_info.filelock_reply->type)
|
||||
fl->fl_type = F_RDLCK;
|
||||
else if (CEPH_LOCK_EXCL == req->r_reply_info.filelock_reply->type)
|
||||
|
|
|
@ -2522,7 +2522,7 @@ CIFSSMBPosixLock(const unsigned int xid, struct cifs_tcon *tcon,
|
|||
pLockData->fl_start = le64_to_cpu(parm_data->start);
|
||||
pLockData->fl_end = pLockData->fl_start +
|
||||
le64_to_cpu(parm_data->length) - 1;
|
||||
pLockData->fl_pid = le32_to_cpu(parm_data->pid);
|
||||
pLockData->fl_pid = -le32_to_cpu(parm_data->pid);
|
||||
}
|
||||
}
|
||||
|
||||
|
|
|
@ -367,7 +367,7 @@ int dlm_posix_get(dlm_lockspace_t *lockspace, u64 number, struct file *file,
|
|||
locks_init_lock(fl);
|
||||
fl->fl_type = (op->info.ex) ? F_WRLCK : F_RDLCK;
|
||||
fl->fl_flags = FL_POSIX;
|
||||
fl->fl_pid = op->info.pid;
|
||||
fl->fl_pid = -op->info.pid;
|
||||
fl->fl_start = op->info.start;
|
||||
fl->fl_end = op->info.end;
|
||||
rv = 0;
|
||||
|
|
|
@ -2102,11 +2102,11 @@ static int convert_fuse_file_lock(struct fuse_conn *fc,
|
|||
fl->fl_end = ffl->end;
|
||||
|
||||
/*
|
||||
* Convert pid into the caller's pid namespace. If the pid
|
||||
* does not map into the namespace fl_pid will get set to 0.
|
||||
* Convert pid into init's pid namespace. The locks API will
|
||||
* translate it into the caller's pid namespace.
|
||||
*/
|
||||
rcu_read_lock();
|
||||
fl->fl_pid = pid_vnr(find_pid_ns(ffl->pid, fc->pid_ns));
|
||||
fl->fl_pid = pid_nr_ns(find_pid_ns(ffl->pid, fc->pid_ns), &init_pid_ns);
|
||||
rcu_read_unlock();
|
||||
break;
|
||||
|
||||
|
|
130
fs/locks.c
130
fs/locks.c
|
@ -137,6 +137,7 @@
|
|||
#define IS_FLOCK(fl) (fl->fl_flags & FL_FLOCK)
|
||||
#define IS_LEASE(fl) (fl->fl_flags & (FL_LEASE|FL_DELEG|FL_LAYOUT))
|
||||
#define IS_OFDLCK(fl) (fl->fl_flags & FL_OFDLCK)
|
||||
#define IS_REMOTELCK(fl) (fl->fl_pid <= 0)
|
||||
|
||||
static inline bool is_remote_lock(struct file *filp)
|
||||
{
|
||||
|
@ -270,6 +271,22 @@ locks_check_ctx_lists(struct inode *inode)
|
|||
}
|
||||
}
|
||||
|
||||
static void
|
||||
locks_check_ctx_file_list(struct file *filp, struct list_head *list,
|
||||
char *list_type)
|
||||
{
|
||||
struct file_lock *fl;
|
||||
struct inode *inode = locks_inode(filp);
|
||||
|
||||
list_for_each_entry(fl, list, fl_list)
|
||||
if (fl->fl_file == filp)
|
||||
pr_warn("Leaked %s lock on dev=0x%x:0x%x ino=0x%lx "
|
||||
" fl_owner=%p fl_flags=0x%x fl_type=0x%x fl_pid=%u\n",
|
||||
list_type, MAJOR(inode->i_sb->s_dev),
|
||||
MINOR(inode->i_sb->s_dev), inode->i_ino,
|
||||
fl->fl_owner, fl->fl_flags, fl->fl_type, fl->fl_pid);
|
||||
}
|
||||
|
||||
void
|
||||
locks_free_lock_context(struct inode *inode)
|
||||
{
|
||||
|
@ -733,7 +750,6 @@ static void locks_wake_up_blocks(struct file_lock *blocker)
|
|||
static void
|
||||
locks_insert_lock_ctx(struct file_lock *fl, struct list_head *before)
|
||||
{
|
||||
fl->fl_nspid = get_pid(task_tgid(current));
|
||||
list_add_tail(&fl->fl_list, before);
|
||||
locks_insert_global_locks(fl);
|
||||
}
|
||||
|
@ -743,10 +759,6 @@ locks_unlink_lock_ctx(struct file_lock *fl)
|
|||
{
|
||||
locks_delete_global_locks(fl);
|
||||
list_del_init(&fl->fl_list);
|
||||
if (fl->fl_nspid) {
|
||||
put_pid(fl->fl_nspid);
|
||||
fl->fl_nspid = NULL;
|
||||
}
|
||||
locks_wake_up_blocks(fl);
|
||||
}
|
||||
|
||||
|
@ -823,8 +835,6 @@ posix_test_lock(struct file *filp, struct file_lock *fl)
|
|||
list_for_each_entry(cfl, &ctx->flc_posix, fl_list) {
|
||||
if (posix_locks_conflict(fl, cfl)) {
|
||||
locks_copy_conflock(fl, cfl);
|
||||
if (cfl->fl_nspid)
|
||||
fl->fl_pid = pid_vnr(cfl->fl_nspid);
|
||||
goto out;
|
||||
}
|
||||
}
|
||||
|
@ -2048,9 +2058,33 @@ int vfs_test_lock(struct file *filp, struct file_lock *fl)
|
|||
}
|
||||
EXPORT_SYMBOL_GPL(vfs_test_lock);
|
||||
|
||||
/**
|
||||
* locks_translate_pid - translate a file_lock's fl_pid number into a namespace
|
||||
* @fl: The file_lock who's fl_pid should be translated
|
||||
* @ns: The namespace into which the pid should be translated
|
||||
*
|
||||
* Used to tranlate a fl_pid into a namespace virtual pid number
|
||||
*/
|
||||
static pid_t locks_translate_pid(struct file_lock *fl, struct pid_namespace *ns)
|
||||
{
|
||||
pid_t vnr;
|
||||
struct pid *pid;
|
||||
|
||||
if (IS_OFDLCK(fl))
|
||||
return -1;
|
||||
if (IS_REMOTELCK(fl))
|
||||
return fl->fl_pid;
|
||||
|
||||
rcu_read_lock();
|
||||
pid = find_pid_ns(fl->fl_pid, &init_pid_ns);
|
||||
vnr = pid_nr_ns(pid, ns);
|
||||
rcu_read_unlock();
|
||||
return vnr;
|
||||
}
|
||||
|
||||
static int posix_lock_to_flock(struct flock *flock, struct file_lock *fl)
|
||||
{
|
||||
flock->l_pid = IS_OFDLCK(fl) ? -1 : fl->fl_pid;
|
||||
flock->l_pid = locks_translate_pid(fl, task_active_pid_ns(current));
|
||||
#if BITS_PER_LONG == 32
|
||||
/*
|
||||
* Make sure we can represent the posix lock via
|
||||
|
@ -2072,7 +2106,7 @@ static int posix_lock_to_flock(struct flock *flock, struct file_lock *fl)
|
|||
#if BITS_PER_LONG == 32
|
||||
static void posix_lock_to_flock64(struct flock64 *flock, struct file_lock *fl)
|
||||
{
|
||||
flock->l_pid = IS_OFDLCK(fl) ? -1 : fl->fl_pid;
|
||||
flock->l_pid = locks_translate_pid(fl, task_active_pid_ns(current));
|
||||
flock->l_start = fl->fl_start;
|
||||
flock->l_len = fl->fl_end == OFFSET_MAX ? 0 :
|
||||
fl->fl_end - fl->fl_start + 1;
|
||||
|
@ -2086,14 +2120,17 @@ static void posix_lock_to_flock64(struct flock64 *flock, struct file_lock *fl)
|
|||
*/
|
||||
int fcntl_getlk(struct file *filp, unsigned int cmd, struct flock *flock)
|
||||
{
|
||||
struct file_lock file_lock;
|
||||
struct file_lock *fl;
|
||||
int error;
|
||||
|
||||
fl = locks_alloc_lock();
|
||||
if (fl == NULL)
|
||||
return -ENOMEM;
|
||||
error = -EINVAL;
|
||||
if (flock->l_type != F_RDLCK && flock->l_type != F_WRLCK)
|
||||
goto out;
|
||||
|
||||
error = flock_to_posix_lock(filp, &file_lock, flock);
|
||||
error = flock_to_posix_lock(filp, fl, flock);
|
||||
if (error)
|
||||
goto out;
|
||||
|
||||
|
@ -2103,23 +2140,22 @@ int fcntl_getlk(struct file *filp, unsigned int cmd, struct flock *flock)
|
|||
goto out;
|
||||
|
||||
cmd = F_GETLK;
|
||||
file_lock.fl_flags |= FL_OFDLCK;
|
||||
file_lock.fl_owner = filp;
|
||||
fl->fl_flags |= FL_OFDLCK;
|
||||
fl->fl_owner = filp;
|
||||
}
|
||||
|
||||
error = vfs_test_lock(filp, &file_lock);
|
||||
error = vfs_test_lock(filp, fl);
|
||||
if (error)
|
||||
goto out;
|
||||
|
||||
flock->l_type = file_lock.fl_type;
|
||||
if (file_lock.fl_type != F_UNLCK) {
|
||||
error = posix_lock_to_flock(flock, &file_lock);
|
||||
flock->l_type = fl->fl_type;
|
||||
if (fl->fl_type != F_UNLCK) {
|
||||
error = posix_lock_to_flock(flock, fl);
|
||||
if (error)
|
||||
goto rel_priv;
|
||||
goto out;
|
||||
}
|
||||
rel_priv:
|
||||
locks_release_private(&file_lock);
|
||||
out:
|
||||
locks_free_lock(fl);
|
||||
return error;
|
||||
}
|
||||
|
||||
|
@ -2298,14 +2334,18 @@ out:
|
|||
*/
|
||||
int fcntl_getlk64(struct file *filp, unsigned int cmd, struct flock64 *flock)
|
||||
{
|
||||
struct file_lock file_lock;
|
||||
struct file_lock *fl;
|
||||
int error;
|
||||
|
||||
fl = locks_alloc_lock();
|
||||
if (fl == NULL)
|
||||
return -ENOMEM;
|
||||
|
||||
error = -EINVAL;
|
||||
if (flock->l_type != F_RDLCK && flock->l_type != F_WRLCK)
|
||||
goto out;
|
||||
|
||||
error = flock64_to_posix_lock(filp, &file_lock, flock);
|
||||
error = flock64_to_posix_lock(filp, fl, flock);
|
||||
if (error)
|
||||
goto out;
|
||||
|
||||
|
@ -2315,20 +2355,20 @@ int fcntl_getlk64(struct file *filp, unsigned int cmd, struct flock64 *flock)
|
|||
goto out;
|
||||
|
||||
cmd = F_GETLK64;
|
||||
file_lock.fl_flags |= FL_OFDLCK;
|
||||
file_lock.fl_owner = filp;
|
||||
fl->fl_flags |= FL_OFDLCK;
|
||||
fl->fl_owner = filp;
|
||||
}
|
||||
|
||||
error = vfs_test_lock(filp, &file_lock);
|
||||
error = vfs_test_lock(filp, fl);
|
||||
if (error)
|
||||
goto out;
|
||||
|
||||
flock->l_type = file_lock.fl_type;
|
||||
if (file_lock.fl_type != F_UNLCK)
|
||||
posix_lock_to_flock64(flock, &file_lock);
|
||||
flock->l_type = fl->fl_type;
|
||||
if (fl->fl_type != F_UNLCK)
|
||||
posix_lock_to_flock64(flock, fl);
|
||||
|
||||
locks_release_private(&file_lock);
|
||||
out:
|
||||
locks_free_lock(fl);
|
||||
return error;
|
||||
}
|
||||
|
||||
|
@ -2525,6 +2565,12 @@ void locks_remove_file(struct file *filp)
|
|||
|
||||
/* remove any leases */
|
||||
locks_remove_lease(filp, ctx);
|
||||
|
||||
spin_lock(&ctx->flc_lock);
|
||||
locks_check_ctx_file_list(filp, &ctx->flc_posix, "POSIX");
|
||||
locks_check_ctx_file_list(filp, &ctx->flc_flock, "FLOCK");
|
||||
locks_check_ctx_file_list(filp, &ctx->flc_lease, "LEASE");
|
||||
spin_unlock(&ctx->flc_lock);
|
||||
}
|
||||
|
||||
/**
|
||||
|
@ -2578,22 +2624,16 @@ static void lock_get_status(struct seq_file *f, struct file_lock *fl,
|
|||
{
|
||||
struct inode *inode = NULL;
|
||||
unsigned int fl_pid;
|
||||
struct pid_namespace *proc_pidns = file_inode(f->file)->i_sb->s_fs_info;
|
||||
|
||||
if (fl->fl_nspid) {
|
||||
struct pid_namespace *proc_pidns = file_inode(f->file)->i_sb->s_fs_info;
|
||||
|
||||
/* Don't let fl_pid change based on who is reading the file */
|
||||
fl_pid = pid_nr_ns(fl->fl_nspid, proc_pidns);
|
||||
|
||||
/*
|
||||
* If there isn't a fl_pid don't display who is waiting on
|
||||
* the lock if we are called from locks_show, or if we are
|
||||
* called from __show_fd_info - skip lock entirely
|
||||
*/
|
||||
if (fl_pid == 0)
|
||||
return;
|
||||
} else
|
||||
fl_pid = fl->fl_pid;
|
||||
fl_pid = locks_translate_pid(fl, proc_pidns);
|
||||
/*
|
||||
* If there isn't a fl_pid don't display who is waiting on
|
||||
* the lock if we are called from locks_show, or if we are
|
||||
* called from __show_fd_info - skip lock entirely
|
||||
*/
|
||||
if (fl_pid == 0)
|
||||
return;
|
||||
|
||||
if (fl->fl_file != NULL)
|
||||
inode = locks_inode(fl->fl_file);
|
||||
|
@ -2668,7 +2708,7 @@ static int locks_show(struct seq_file *f, void *v)
|
|||
|
||||
fl = hlist_entry(v, struct file_lock, fl_link);
|
||||
|
||||
if (fl->fl_nspid && !pid_nr_ns(fl->fl_nspid, proc_pidns))
|
||||
if (locks_translate_pid(fl, proc_pidns) == 0)
|
||||
return 0;
|
||||
|
||||
lock_get_status(f, fl, iter->li_pos, "");
|
||||
|
|
|
@ -1002,7 +1002,6 @@ struct file_lock {
|
|||
unsigned char fl_type;
|
||||
unsigned int fl_pid;
|
||||
int fl_link_cpu; /* what cpu's list is this on? */
|
||||
struct pid *fl_nspid;
|
||||
wait_queue_head_t fl_wait;
|
||||
struct file *fl_file;
|
||||
loff_t fl_start;
|
||||
|
|
Loading…
Reference in New Issue