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brlocks/lglocks: API cleanups

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lglocks and brlocks are currently generated with some complicated macros
in lglock.h.  But there's no reason to not just use common utility
functions and put all the data into a common data structure.

In preparation, this patch changes the API to look more like normal
function calls with pointers, not magic macros.

The patch is rather large because I move over all users in one go to keep
it bisectable.  This impacts the VFS somewhat in terms of lines changed.
But no actual behaviour change.

[akpm@linux-foundation.org: checkpatch fixes]
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Andi Kleen 2012-05-08 13:32:02 +09:30 committed by Al Viro
parent eea62f831b
commit 962830df36
6 changed files with 96 additions and 95 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
fs/dcache.c
View File

@ -2575,7 +2575,7 @@ static int prepend_path(const struct path *path,
bool slash = false;
int error = 0;
br_read_lock(vfsmount_lock);
br_read_lock(&vfsmount_lock);
while (dentry != root->dentry || vfsmnt != root->mnt) {
struct dentry * parent;
@ -2606,7 +2606,7 @@ static int prepend_path(const struct path *path,
error = prepend(buffer, buflen, "/", 1);
out:
br_read_unlock(vfsmount_lock);
br_read_unlock(&vfsmount_lock);
return error;
global_root:

16
fs/file_table.c
View File

@ -420,9 +420,9 @@ static inline void __file_sb_list_add(struct file *file, struct super_block *sb)
*/
void file_sb_list_add(struct file *file, struct super_block *sb)
{
lg_local_lock(files_lglock);
lg_local_lock(&files_lglock);
__file_sb_list_add(file, sb);
lg_local_unlock(files_lglock);
lg_local_unlock(&files_lglock);
}
/**
@ -435,9 +435,9 @@ void file_sb_list_add(struct file *file, struct super_block *sb)
void file_sb_list_del(struct file *file)
{
if (!list_empty(&file->f_u.fu_list)) {
lg_local_lock_cpu(files_lglock, file_list_cpu(file));
lg_local_lock_cpu(&files_lglock, file_list_cpu(file));
list_del_init(&file->f_u.fu_list);
lg_local_unlock_cpu(files_lglock, file_list_cpu(file));
lg_local_unlock_cpu(&files_lglock, file_list_cpu(file));
}
}
@ -484,7 +484,7 @@ void mark_files_ro(struct super_block *sb)
struct file *f;
retry:
lg_global_lock(files_lglock);
lg_global_lock(&files_lglock);
do_file_list_for_each_entry(sb, f) {
struct vfsmount *mnt;
if (!S_ISREG(f->f_path.dentry->d_inode->i_mode))
@ -501,12 +501,12 @@ retry:
file_release_write(f);
mnt = mntget(f->f_path.mnt);
/* This can sleep, so we can't hold the spinlock. */
lg_global_unlock(files_lglock);
lg_global_unlock(&files_lglock);
mnt_drop_write(mnt);
mntput(mnt);
goto retry;
} while_file_list_for_each_entry;
lg_global_unlock(files_lglock);
lg_global_unlock(&files_lglock);
}
void __init files_init(unsigned long mempages)
@ -524,6 +524,6 @@ void __init files_init(unsigned long mempages)
n = (mempages * (PAGE_SIZE / 1024)) / 10;
files_stat.max_files = max_t(unsigned long, n, NR_FILE);
files_defer_init();
lg_lock_init(files_lglock);
lg_lock_init(&files_lglock, "files_lglock");
percpu_counter_init(&nr_files, 0);
}

24
fs/namei.c
View File

@ -449,7 +449,7 @@ static int unlazy_walk(struct nameidata *nd, struct dentry *dentry)
mntget(nd->path.mnt);
rcu_read_unlock();
br_read_unlock(vfsmount_lock);
br_read_unlock(&vfsmount_lock);
nd->flags &= ~LOOKUP_RCU;
return 0;
@ -507,14 +507,14 @@ static int complete_walk(struct nameidata *nd)
if (unlikely(!__d_rcu_to_refcount(dentry, nd->seq))) {
spin_unlock(&dentry->d_lock);
rcu_read_unlock();
br_read_unlock(vfsmount_lock);
br_read_unlock(&vfsmount_lock);
return -ECHILD;
}
BUG_ON(nd->inode != dentry->d_inode);
spin_unlock(&dentry->d_lock);
mntget(nd->path.mnt);
rcu_read_unlock();
br_read_unlock(vfsmount_lock);
br_read_unlock(&vfsmount_lock);
}
if (likely(!(nd->flags & LOOKUP_JUMPED)))
@ -681,15 +681,15 @@ int follow_up(struct path *path)
struct mount *parent;
struct dentry *mountpoint;
br_read_lock(vfsmount_lock);
br_read_lock(&vfsmount_lock);
parent = mnt->mnt_parent;
if (&parent->mnt == path->mnt) {
br_read_unlock(vfsmount_lock);
br_read_unlock(&vfsmount_lock);
return 0;
}
mntget(&parent->mnt);
mountpoint = dget(mnt->mnt_mountpoint);
br_read_unlock(vfsmount_lock);
br_read_unlock(&vfsmount_lock);
dput(path->dentry);
path->dentry = mountpoint;
mntput(path->mnt);
@ -947,7 +947,7 @@ failed:
if (!(nd->flags & LOOKUP_ROOT))
nd->root.mnt = NULL;
rcu_read_unlock();
br_read_unlock(vfsmount_lock);
br_read_unlock(&vfsmount_lock);
return -ECHILD;
}
@ -1265,7 +1265,7 @@ static void terminate_walk(struct nameidata *nd)
if (!(nd->flags & LOOKUP_ROOT))
nd->root.mnt = NULL;
rcu_read_unlock();
br_read_unlock(vfsmount_lock);
br_read_unlock(&vfsmount_lock);
}
}
@ -1620,7 +1620,7 @@ static int path_init(int dfd, const char *name, unsigned int flags,
nd->path = nd->root;
nd->inode = inode;
if (flags & LOOKUP_RCU) {
br_read_lock(vfsmount_lock);
br_read_lock(&vfsmount_lock);
rcu_read_lock();
nd->seq = __read_seqcount_begin(&nd->path.dentry->d_seq);
} else {
@ -1633,7 +1633,7 @@ static int path_init(int dfd, const char *name, unsigned int flags,
if (*name=='/') {
if (flags & LOOKUP_RCU) {
br_read_lock(vfsmount_lock);
br_read_lock(&vfsmount_lock);
rcu_read_lock();
set_root_rcu(nd);
} else {
@ -1646,7 +1646,7 @@ static int path_init(int dfd, const char *name, unsigned int flags,
struct fs_struct *fs = current->fs;
unsigned seq;
br_read_lock(vfsmount_lock);
br_read_lock(&vfsmount_lock);
rcu_read_lock();
do {
@ -1682,7 +1682,7 @@ static int path_init(int dfd, const char *name, unsigned int flags,
if (fput_needed)
*fp = file;
nd->seq = __read_seqcount_begin(&nd->path.dentry->d_seq);
br_read_lock(vfsmount_lock);
br_read_lock(&vfsmount_lock);
rcu_read_lock();
} else {
path_get(&file->f_path);

139
fs/namespace.c
View File

@ -397,7 +397,7 @@ static int mnt_make_readonly(struct mount *mnt)
{
int ret = 0;
br_write_lock(vfsmount_lock);
br_write_lock(&vfsmount_lock);
mnt->mnt.mnt_flags |= MNT_WRITE_HOLD;
/*
* After storing MNT_WRITE_HOLD, we'll read the counters. This store
@ -431,15 +431,15 @@ static int mnt_make_readonly(struct mount *mnt)
*/
smp_wmb();
mnt->mnt.mnt_flags &= ~MNT_WRITE_HOLD;
br_write_unlock(vfsmount_lock);
br_write_unlock(&vfsmount_lock);
return ret;
}
static void __mnt_unmake_readonly(struct mount *mnt)
{
br_write_lock(vfsmount_lock);
br_write_lock(&vfsmount_lock);
mnt->mnt.mnt_flags &= ~MNT_READONLY;
br_write_unlock(vfsmount_lock);
br_write_unlock(&vfsmount_lock);
}
int sb_prepare_remount_readonly(struct super_block *sb)
@ -451,7 +451,7 @@ int sb_prepare_remount_readonly(struct super_block *sb)
if (atomic_long_read(&sb->s_remove_count))
return -EBUSY;
br_write_lock(vfsmount_lock);
br_write_lock(&vfsmount_lock);
list_for_each_entry(mnt, &sb->s_mounts, mnt_instance) {
if (!(mnt->mnt.mnt_flags & MNT_READONLY)) {
mnt->mnt.mnt_flags |= MNT_WRITE_HOLD;
@ -473,7 +473,7 @@ int sb_prepare_remount_readonly(struct super_block *sb)
if (mnt->mnt.mnt_flags & MNT_WRITE_HOLD)
mnt->mnt.mnt_flags &= ~MNT_WRITE_HOLD;
}
br_write_unlock(vfsmount_lock);
br_write_unlock(&vfsmount_lock);
return err;
}
@ -522,14 +522,14 @@ struct vfsmount *lookup_mnt(struct path *path)
{
struct mount *child_mnt;
br_read_lock(vfsmount_lock);
br_read_lock(&vfsmount_lock);
child_mnt = __lookup_mnt(path->mnt, path->dentry, 1);
if (child_mnt) {
mnt_add_count(child_mnt, 1);
br_read_unlock(vfsmount_lock);
br_read_unlock(&vfsmount_lock);
return &child_mnt->mnt;
} else {
br_read_unlock(vfsmount_lock);
br_read_unlock(&vfsmount_lock);
return NULL;
}
}
@ -714,9 +714,9 @@ vfs_kern_mount(struct file_system_type *type, int flags, const char *name, void
mnt->mnt.mnt_sb = root->d_sb;
mnt->mnt_mountpoint = mnt->mnt.mnt_root;
mnt->mnt_parent = mnt;
br_write_lock(vfsmount_lock);
br_write_lock(&vfsmount_lock);
list_add_tail(&mnt->mnt_instance, &root->d_sb->s_mounts);
br_write_unlock(vfsmount_lock);
br_write_unlock(&vfsmount_lock);
return &mnt->mnt;
}
EXPORT_SYMBOL_GPL(vfs_kern_mount);
@ -745,9 +745,9 @@ static struct mount *clone_mnt(struct mount *old, struct dentry *root,
mnt->mnt.mnt_root = dget(root);
mnt->mnt_mountpoint = mnt->mnt.mnt_root;
mnt->mnt_parent = mnt;
br_write_lock(vfsmount_lock);
br_write_lock(&vfsmount_lock);
list_add_tail(&mnt->mnt_instance, &sb->s_mounts);
br_write_unlock(vfsmount_lock);
br_write_unlock(&vfsmount_lock);
if (flag & CL_SLAVE) {
list_add(&mnt->mnt_slave, &old->mnt_slave_list);
@ -803,35 +803,36 @@ static void mntput_no_expire(struct mount *mnt)
{
put_again:
#ifdef CONFIG_SMP
br_read_lock(vfsmount_lock);
br_read_lock(&vfsmount_lock);
if (likely(atomic_read(&mnt->mnt_longterm))) {
mnt_add_count(mnt, -1);
br_read_unlock(vfsmount_lock);
br_read_unlock(&vfsmount_lock);
return;
}
br_read_unlock(vfsmount_lock);
br_read_unlock(&vfsmount_lock);
br_write_lock(vfsmount_lock);
br_write_lock(&vfsmount_lock);
mnt_add_count(mnt, -1);
if (mnt_get_count(mnt)) {
br_write_unlock(vfsmount_lock);
br_write_unlock(&vfsmount_lock);
return;
}
#else
mnt_add_count(mnt, -1);
if (likely(mnt_get_count(mnt)))
return;
br_write_lock(vfsmount_lock);
br_write_lock(&vfsmount_lock);
#endif
if (unlikely(mnt->mnt_pinned)) {
mnt_add_count(mnt, mnt->mnt_pinned + 1);
mnt->mnt_pinned = 0;
br_write_unlock(vfsmount_lock);
br_write_unlock(&vfsmount_lock);
acct_auto_close_mnt(&mnt->mnt);
goto put_again;
}
list_del(&mnt->mnt_instance);
br_write_unlock(vfsmount_lock);
br_write_unlock(&vfsmount_lock);
mntfree(mnt);
}
@ -857,21 +858,21 @@ EXPORT_SYMBOL(mntget);
void mnt_pin(struct vfsmount *mnt)
{
br_write_lock(vfsmount_lock);
br_write_lock(&vfsmount_lock);
real_mount(mnt)->mnt_pinned++;
br_write_unlock(vfsmount_lock);
br_write_unlock(&vfsmount_lock);
}
EXPORT_SYMBOL(mnt_pin);
void mnt_unpin(struct vfsmount *m)
{
struct mount *mnt = real_mount(m);
br_write_lock(vfsmount_lock);
br_write_lock(&vfsmount_lock);
if (mnt->mnt_pinned) {
mnt_add_count(mnt, 1);
mnt->mnt_pinned--;
}
br_write_unlock(vfsmount_lock);
br_write_unlock(&vfsmount_lock);
}
EXPORT_SYMBOL(mnt_unpin);
@ -988,12 +989,12 @@ int may_umount_tree(struct vfsmount *m)
BUG_ON(!m);
/* write lock needed for mnt_get_count */
br_write_lock(vfsmount_lock);
br_write_lock(&vfsmount_lock);
for (p = mnt; p; p = next_mnt(p, mnt)) {
actual_refs += mnt_get_count(p);
minimum_refs += 2;
}
br_write_unlock(vfsmount_lock);
br_write_unlock(&vfsmount_lock);
if (actual_refs > minimum_refs)
return 0;
@ -1020,10 +1021,10 @@ int may_umount(struct vfsmount *mnt)
{
int ret = 1;
down_read(&namespace_sem);
br_write_lock(vfsmount_lock);
br_write_lock(&vfsmount_lock);
if (propagate_mount_busy(real_mount(mnt), 2))
ret = 0;
br_write_unlock(vfsmount_lock);
br_write_unlock(&vfsmount_lock);
up_read(&namespace_sem);
return ret;
}
@ -1040,13 +1041,13 @@ void release_mounts(struct list_head *head)
struct dentry *dentry;
struct mount *m;
br_write_lock(vfsmount_lock);
br_write_lock(&vfsmount_lock);
dentry = mnt->mnt_mountpoint;
m = mnt->mnt_parent;
mnt->mnt_mountpoint = mnt->mnt.mnt_root;
mnt->mnt_parent = mnt;
m->mnt_ghosts--;
br_write_unlock(vfsmount_lock);
br_write_unlock(&vfsmount_lock);
dput(dentry);
mntput(&m->mnt);
}
@ -1112,12 +1113,12 @@ static int do_umount(struct mount *mnt, int flags)
* probably don't strictly need the lock here if we examined
* all race cases, but it's a slowpath.
*/
br_write_lock(vfsmount_lock);
br_write_lock(&vfsmount_lock);
if (mnt_get_count(mnt) != 2) {
br_write_unlock(vfsmount_lock);
br_write_unlock(&vfsmount_lock);
return -EBUSY;
}
br_write_unlock(vfsmount_lock);
br_write_unlock(&vfsmount_lock);
if (!xchg(&mnt->mnt_expiry_mark, 1))
return -EAGAIN;
@ -1159,7 +1160,7 @@ static int do_umount(struct mount *mnt, int flags)
}
down_write(&namespace_sem);
br_write_lock(vfsmount_lock);
br_write_lock(&vfsmount_lock);
event++;
if (!(flags & MNT_DETACH))
@ -1171,7 +1172,7 @@ static int do_umount(struct mount *mnt, int flags)
umount_tree(mnt, 1, &umount_list);
retval = 0;
}
br_write_unlock(vfsmount_lock);
br_write_unlock(&vfsmount_lock);
up_write(&namespace_sem);
release_mounts(&umount_list);
return retval;
@ -1286,19 +1287,19 @@ struct mount *copy_tree(struct mount *mnt, struct dentry *dentry,
q = clone_mnt(p, p->mnt.mnt_root, flag);
if (!q)
goto Enomem;
br_write_lock(vfsmount_lock);
br_write_lock(&vfsmount_lock);
list_add_tail(&q->mnt_list, &res->mnt_list);
attach_mnt(q, &path);
br_write_unlock(vfsmount_lock);
br_write_unlock(&vfsmount_lock);
}
}
return res;
Enomem:
if (res) {
LIST_HEAD(umount_list);
br_write_lock(vfsmount_lock);
br_write_lock(&vfsmount_lock);
umount_tree(res, 0, &umount_list);
br_write_unlock(vfsmount_lock);
br_write_unlock(&vfsmount_lock);
release_mounts(&umount_list);
}
return NULL;
@ -1318,9 +1319,9 @@ void drop_collected_mounts(struct vfsmount *mnt)
{
LIST_HEAD(umount_list);
down_write(&namespace_sem);
br_write_lock(vfsmount_lock);
br_write_lock(&vfsmount_lock);
umount_tree(real_mount(mnt), 0, &umount_list);
br_write_unlock(vfsmount_lock);
br_write_unlock(&vfsmount_lock);
up_write(&namespace_sem);
release_mounts(&umount_list);
}
@ -1448,7 +1449,7 @@ static int attach_recursive_mnt(struct mount *source_mnt,
if (err)
goto out_cleanup_ids;
br_write_lock(vfsmount_lock);
br_write_lock(&vfsmount_lock);
if (IS_MNT_SHARED(dest_mnt)) {
for (p = source_mnt; p; p = next_mnt(p, source_mnt))
@ -1467,7 +1468,7 @@ static int attach_recursive_mnt(struct mount *source_mnt,
list_del_init(&child->mnt_hash);
commit_tree(child);
}
br_write_unlock(vfsmount_lock);
br_write_unlock(&vfsmount_lock);
return 0;
@ -1565,10 +1566,10 @@ static int do_change_type(struct path *path, int flag)
goto out_unlock;
}
br_write_lock(vfsmount_lock);
br_write_lock(&vfsmount_lock);
for (m = mnt; m; m = (recurse ? next_mnt(m, mnt) : NULL))
change_mnt_propagation(m, type);
br_write_unlock(vfsmount_lock);
br_write_unlock(&vfsmount_lock);
out_unlock:
up_write(&namespace_sem);
@ -1617,9 +1618,9 @@ static int do_loopback(struct path *path, char *old_name,
err = graft_tree(mnt, path);
if (err) {
br_write_lock(vfsmount_lock);
br_write_lock(&vfsmount_lock);
umount_tree(mnt, 0, &umount_list);
br_write_unlock(vfsmount_lock);
br_write_unlock(&vfsmount_lock);
}
out2:
unlock_mount(path);
@ -1677,16 +1678,16 @@ static int do_remount(struct path *path, int flags, int mnt_flags,
else
err = do_remount_sb(sb, flags, data, 0);
if (!err) {
br_write_lock(vfsmount_lock);
br_write_lock(&vfsmount_lock);
mnt_flags |= mnt->mnt.mnt_flags & MNT_PROPAGATION_MASK;
mnt->mnt.mnt_flags = mnt_flags;
br_write_unlock(vfsmount_lock);
br_write_unlock(&vfsmount_lock);
}
up_write(&sb->s_umount);
if (!err) {
br_write_lock(vfsmount_lock);
br_write_lock(&vfsmount_lock);
touch_mnt_namespace(mnt->mnt_ns);
br_write_unlock(vfsmount_lock);
br_write_unlock(&vfsmount_lock);
}
return err;
}
@ -1893,9 +1894,9 @@ fail:
/* remove m from any expiration list it may be on */
if (!list_empty(&mnt->mnt_expire)) {
down_write(&namespace_sem);
br_write_lock(vfsmount_lock);
br_write_lock(&vfsmount_lock);
list_del_init(&mnt->mnt_expire);
br_write_unlock(vfsmount_lock);
br_write_unlock(&vfsmount_lock);
up_write(&namespace_sem);
}
mntput(m);
@ -1911,11 +1912,11 @@ fail:
void mnt_set_expiry(struct vfsmount *mnt, struct list_head *expiry_list)
{
down_write(&namespace_sem);
br_write_lock(vfsmount_lock);
br_write_lock(&vfsmount_lock);
list_add_tail(&real_mount(mnt)->mnt_expire, expiry_list);
br_write_unlock(vfsmount_lock);
br_write_unlock(&vfsmount_lock);
up_write(&namespace_sem);
}
EXPORT_SYMBOL(mnt_set_expiry);
@ -1935,7 +1936,7 @@ void mark_mounts_for_expiry(struct list_head *mounts)
return;
down_write(&namespace_sem);
br_write_lock(vfsmount_lock);
br_write_lock(&vfsmount_lock);
/* extract from the expiration list every vfsmount that matches the
* following criteria:
@ -1954,7 +1955,7 @@ void mark_mounts_for_expiry(struct list_head *mounts)
touch_mnt_namespace(mnt->mnt_ns);
umount_tree(mnt, 1, &umounts);
}
br_write_unlock(vfsmount_lock);
br_write_unlock(&vfsmount_lock);
up_write(&namespace_sem);
release_mounts(&umounts);
@ -2218,9 +2219,9 @@ void mnt_make_shortterm(struct vfsmount *m)
struct mount *mnt = real_mount(m);
if (atomic_add_unless(&mnt->mnt_longterm, -1, 1))
return;
br_write_lock(vfsmount_lock);
br_write_lock(&vfsmount_lock);
atomic_dec(&mnt->mnt_longterm);
br_write_unlock(vfsmount_lock);
br_write_unlock(&vfsmount_lock);
#endif
}
@ -2250,9 +2251,9 @@ static struct mnt_namespace *dup_mnt_ns(struct mnt_namespace *mnt_ns,
return ERR_PTR(-ENOMEM);
}
new_ns->root = new;
br_write_lock(vfsmount_lock);
br_write_lock(&vfsmount_lock);
list_add_tail(&new_ns->list, &new->mnt_list);
br_write_unlock(vfsmount_lock);
br_write_unlock(&vfsmount_lock);
/*
* Second pass: switch the tsk->fs->* elements and mark new vfsmounts
@ -2416,9 +2417,9 @@ bool is_path_reachable(struct mount *mnt, struct dentry *dentry,
int path_is_under(struct path *path1, struct path *path2)
{
int res;
br_read_lock(vfsmount_lock);
br_read_lock(&vfsmount_lock);
res = is_path_reachable(real_mount(path1->mnt), path1->dentry, path2);
br_read_unlock(vfsmount_lock);
br_read_unlock(&vfsmount_lock);
return res;
}
EXPORT_SYMBOL(path_is_under);
@ -2505,7 +2506,7 @@ SYSCALL_DEFINE2(pivot_root, const char __user *, new_root,
/* make sure we can reach put_old from new_root */
if (!is_path_reachable(real_mount(old.mnt), old.dentry, &new))
goto out4;
br_write_lock(vfsmount_lock);
br_write_lock(&vfsmount_lock);
detach_mnt(new_mnt, &parent_path);
detach_mnt(root_mnt, &root_parent);
/* mount old root on put_old */
@ -2513,7 +2514,7 @@ SYSCALL_DEFINE2(pivot_root, const char __user *, new_root,
/* mount new_root on / */
attach_mnt(new_mnt, &root_parent);
touch_mnt_namespace(current->nsproxy->mnt_ns);
br_write_unlock(vfsmount_lock);
br_write_unlock(&vfsmount_lock);
chroot_fs_refs(&root, &new);
error = 0;
out4:
@ -2576,7 +2577,7 @@ void __init mnt_init(void)
for (u = 0; u < HASH_SIZE; u++)
INIT_LIST_HEAD(&mount_hashtable[u]);
br_lock_init(vfsmount_lock);
br_lock_init(&vfsmount_lock);
err = sysfs_init();
if (err)
@ -2596,9 +2597,9 @@ void put_mnt_ns(struct mnt_namespace *ns)
if (!atomic_dec_and_test(&ns->count))
return;
down_write(&namespace_sem);
br_write_lock(vfsmount_lock);
br_write_lock(&vfsmount_lock);
umount_tree(ns->root, 0, &umount_list);
br_write_unlock(vfsmount_lock);
br_write_unlock(&vfsmount_lock);
up_write(&namespace_sem);
release_mounts(&umount_list);
kfree(ns);

4
fs/pnode.c
View File

@ -257,12 +257,12 @@ int propagate_mnt(struct mount *dest_mnt, struct dentry *dest_dentry,
prev_src_mnt = child;
}
out:
br_write_lock(vfsmount_lock);
br_write_lock(&vfsmount_lock);
while (!list_empty(&tmp_list)) {
child = list_first_entry(&tmp_list, struct mount, mnt_hash);
umount_tree(child, 0, &umount_list);
}
br_write_unlock(vfsmount_lock);
br_write_unlock(&vfsmount_lock);
release_mounts(&umount_list);
return ret;
}

4
fs/proc_namespace.c
View File

@ -23,12 +23,12 @@ static unsigned mounts_poll(struct file *file, poll_table *wait)
poll_wait(file, &p->ns->poll, wait);
br_read_lock(vfsmount_lock);
br_read_lock(&vfsmount_lock);
if (p->m.poll_event != ns->event) {
p->m.poll_event = ns->event;
res |= POLLERR | POLLPRI;
}
br_read_unlock(vfsmount_lock);
br_read_unlock(&vfsmount_lock);
return res;
}