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| author | Miklos Szeredi <mszeredi@suse.cz> | 2011-11-21 12:11:30 +0100 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2012-01-06 23:20:12 -0500 |
| commit | 39f7c4db1d2d9e2e2a90abdf34811783089d217d (patch) | |
| tree | cbc3496ce21e26b5891bb4c4d4155853317ddfb3 /fs/namespace.c | |
| parent | 34c80b1d93e6e20ca9dea0baf583a5b5510d92d4 (diff) | |
| download | lwn-39f7c4db1d2d9e2e2a90abdf34811783089d217d.tar.gz lwn-39f7c4db1d2d9e2e2a90abdf34811783089d217d.zip | |
vfs: keep list of mounts for each superblock
Keep track of vfsmounts belonging to a superblock. List is protected
by vfsmount_lock.
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Tested-by: Toshiyuki Okajima <toshi.okajima@jp.fujitsu.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/namespace.c')
| -rw-r--r-- | fs/namespace.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/fs/namespace.c b/fs/namespace.c index db65e2e4921f..145217b088d1 100644 --- a/fs/namespace.c +++ b/fs/namespace.c @@ -671,6 +671,9 @@ 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); + list_add_tail(&mnt->mnt_instance, &root->d_sb->s_mounts); + br_write_unlock(vfsmount_lock); return &mnt->mnt; } EXPORT_SYMBOL_GPL(vfs_kern_mount); @@ -699,6 +702,9 @@ 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); + list_add_tail(&mnt->mnt_instance, &sb->s_mounts); + br_write_unlock(vfsmount_lock); if (flag & CL_SLAVE) { list_add(&mnt->mnt_slave, &old->mnt_slave_list); @@ -781,6 +787,7 @@ put_again: acct_auto_close_mnt(&mnt->mnt); goto put_again; } + list_del(&mnt->mnt_instance); br_write_unlock(vfsmount_lock); mntfree(mnt); } |