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author | David Howells <dhowells@redhat.com> | 2011-01-14 18:46:51 +0000 |
---|---|---|
committer | Al Viro <viro@zeniv.linux.org.uk> | 2011-01-15 20:07:47 -0500 |
commit | ab90911ff90cdab59b31c045c3f0ae480d14f29d (patch) | |
tree | 683450a66eb9dc6bf053e38d63f4740bb53a7b6e /fs/autofs4/root.c | |
parent | 87556ef19926e97464e0163a7840140527ae6615 (diff) | |
download | linux-stable-ab90911ff90cdab59b31c045c3f0ae480d14f29d.tar.gz linux-stable-ab90911ff90cdab59b31c045c3f0ae480d14f29d.tar.bz2 linux-stable-ab90911ff90cdab59b31c045c3f0ae480d14f29d.zip |
Allow d_manage() to be used in RCU-walk mode
Allow d_manage() to be called from pathwalk when it is in RCU-walk mode as well
as when it is in Ref-walk mode. This permits __follow_mount_rcu() to call
d_manage() directly. d_manage() needs a parameter to indicate that it is in
RCU-walk mode as it isn't allowed to sleep if in that mode (but should return
-ECHILD instead).
autofs4_d_manage() can then be set to retain RCU-walk mode if the daemon
accesses it and otherwise request dropping back to ref-walk mode.
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/autofs4/root.c')
-rw-r--r-- | fs/autofs4/root.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/fs/autofs4/root.c b/fs/autofs4/root.c index 9194e274f849..dbd95512808c 100644 --- a/fs/autofs4/root.c +++ b/fs/autofs4/root.c @@ -36,7 +36,7 @@ static long autofs4_root_compat_ioctl(struct file *,unsigned int,unsigned long); static int autofs4_dir_open(struct inode *inode, struct file *file); static struct dentry *autofs4_lookup(struct inode *,struct dentry *, struct nameidata *); static struct vfsmount *autofs4_d_automount(struct path *); -static int autofs4_d_manage(struct dentry *, bool); +static int autofs4_d_manage(struct dentry *, bool, bool); const struct file_operations autofs4_root_operations = { .open = dcache_dir_open, @@ -450,7 +450,7 @@ done: return NULL; } -int autofs4_d_manage(struct dentry *dentry, bool mounting_here) +int autofs4_d_manage(struct dentry *dentry, bool mounting_here, bool rcu_walk) { struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb); @@ -464,6 +464,10 @@ int autofs4_d_manage(struct dentry *dentry, bool mounting_here) return 0; } + /* We need to sleep, so we need pathwalk to be in ref-mode */ + if (rcu_walk) + return -ECHILD; + /* Wait for pending expires */ do_expire_wait(dentry); |