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authorIan Kent <raven@themaw.net>2011-01-14 18:46:03 +0000
committerAl Viro <viro@zeniv.linux.org.uk>2011-01-15 20:07:38 -0500
commitb5b801779d59165c4ecf1009009109545bd1f642 (patch)
tree3a1c8b2e65e72977993ba96c1398edba4c63cbf5 /fs/autofs4/autofs_i.h
parentautofs4: Add d_automount() dentry operation (diff)
downloadlinux-dev-b5b801779d59165c4ecf1009009109545bd1f642.tar.xz
linux-dev-b5b801779d59165c4ecf1009009109545bd1f642.zip
autofs4: Add d_manage() dentry operation
This patch required a previous patch to add the ->d_automount() dentry operation. Add a function to use the newly defined ->d_manage() dentry operation for blocking during mount and expire. Whether the VFS calls the dentry operations d_automount() and d_manage() is controled by the DMANAGED_AUTOMOUNT and DMANAGED_TRANSIT flags. autofs uses the d_automount() operation to callback to user space to request mount operations and the d_manage() operation to block walks into mounts that are under construction or destruction. In order to prevent these functions from being called unnecessarily the DMANAGED_* flags are cleared for cases which would cause this. In the common case the DMANAGED_AUTOMOUNT and DMANAGED_TRANSIT flags are both set for dentrys waiting to be mounted. The DMANAGED_TRANSIT flag is cleared upon successful mount request completion and set during expire runs, both during the dentry expire check, and if selected for expire, is left set until a subsequent successful mount request completes. The exception to this is the so-called rootless multi-mount which has no actual mount at its base. In this case the DMANAGED_AUTOMOUNT flag is cleared upon successful mount request completion as well and set again after a successful expire. Signed-off-by: Ian Kent <raven@themaw.net> Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/autofs4/autofs_i.h')
-rw-r--r--fs/autofs4/autofs_i.h50
1 files changed, 49 insertions, 1 deletions
diff --git a/fs/autofs4/autofs_i.h b/fs/autofs4/autofs_i.h
index 1ebfe53872b5..f0c95e0460cf 100644
--- a/fs/autofs4/autofs_i.h
+++ b/fs/autofs4/autofs_i.h
@@ -99,7 +99,6 @@ struct autofs_info {
};
#define AUTOFS_INF_EXPIRING (1<<0) /* dentry is in the process of expiring */
-#define AUTOFS_INF_MOUNTPOINT (1<<1) /* mountpoint status for direct expire */
#define AUTOFS_INF_PENDING (1<<2) /* dentry pending mount */
struct autofs_wait_queue {
@@ -221,6 +220,7 @@ extern const struct file_operations autofs4_root_operations;
/* Operations methods */
struct vfsmount *autofs4_d_automount(struct path *);
+int autofs4_d_manage(struct dentry *, bool);
/* VFS automount flags management functions */
@@ -248,6 +248,54 @@ static inline void managed_dentry_clear_automount(struct dentry *dentry)
spin_unlock(&dentry->d_lock);
}
+static inline void __managed_dentry_set_transit(struct dentry *dentry)
+{
+ dentry->d_flags |= DCACHE_MANAGE_TRANSIT;
+}
+
+static inline void managed_dentry_set_transit(struct dentry *dentry)
+{
+ spin_lock(&dentry->d_lock);
+ __managed_dentry_set_transit(dentry);
+ spin_unlock(&dentry->d_lock);
+}
+
+static inline void __managed_dentry_clear_transit(struct dentry *dentry)
+{
+ dentry->d_flags &= ~DCACHE_MANAGE_TRANSIT;
+}
+
+static inline void managed_dentry_clear_transit(struct dentry *dentry)
+{
+ spin_lock(&dentry->d_lock);
+ __managed_dentry_clear_transit(dentry);
+ spin_unlock(&dentry->d_lock);
+}
+
+static inline void __managed_dentry_set_managed(struct dentry *dentry)
+{
+ dentry->d_flags |= (DCACHE_NEED_AUTOMOUNT|DCACHE_MANAGE_TRANSIT);
+}
+
+static inline void managed_dentry_set_managed(struct dentry *dentry)
+{
+ spin_lock(&dentry->d_lock);
+ __managed_dentry_set_managed(dentry);
+ spin_unlock(&dentry->d_lock);
+}
+
+static inline void __managed_dentry_clear_managed(struct dentry *dentry)
+{
+ dentry->d_flags &= ~(DCACHE_NEED_AUTOMOUNT|DCACHE_MANAGE_TRANSIT);
+}
+
+static inline void managed_dentry_clear_managed(struct dentry *dentry)
+{
+ spin_lock(&dentry->d_lock);
+ __managed_dentry_clear_managed(dentry);
+ spin_unlock(&dentry->d_lock);
+}
+
/* Initializing function */
int autofs4_fill_super(struct super_block *, void *, int);