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author | Ian Kent <raven@themaw.net> | 2011-01-14 18:46:35 +0000 |
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committer | Al Viro <viro@zeniv.linux.org.uk> | 2011-01-15 20:07:44 -0500 |
commit | dd89f90d2deb9aa5bc8e1b15d726ff5c0bb2b623 (patch) | |
tree | 0f3d8c9c66be46215cc5b10d51ccb25cc8e68da1 | |
parent | 9e3fea16ba386fa549a0b2de8a203e5d412997a0 (diff) | |
download | linux-3.10-dd89f90d2deb9aa5bc8e1b15d726ff5c0bb2b623.tar.gz linux-3.10-dd89f90d2deb9aa5bc8e1b15d726ff5c0bb2b623.tar.bz2 linux-3.10-dd89f90d2deb9aa5bc8e1b15d726ff5c0bb2b623.zip |
autofs4: Add v4 pseudo direct mount support
Version 4 of autofs provides a pseudo direct mount implementation
that relies on directories at the leaves of a directory tree under
an indirect mount to trigger mounts.
This patch adds support for that functionality.
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>
-rw-r--r-- | fs/autofs4/root.c | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/fs/autofs4/root.c b/fs/autofs4/root.c index 8315565ed7d..9194e274f84 100644 --- a/fs/autofs4/root.c +++ b/fs/autofs4/root.c @@ -630,6 +630,58 @@ static int autofs4_dir_unlink(struct inode *dir, struct dentry *dentry) return 0; } +/* + * Version 4 of autofs provides a pseudo direct mount implementation + * that relies on directories at the leaves of a directory tree under + * an indirect mount to trigger mounts. To allow for this we need to + * set the DMANAGED_AUTOMOUNT and DMANAGED_TRANSIT flags on the leaves + * of the directory tree. There is no need to clear the automount flag + * following a mount or restore it after an expire because these mounts + * are always covered. However, it is neccessary to ensure that these + * flags are clear on non-empty directories to avoid unnecessary calls + * during path walks. + */ +static void autofs_set_leaf_automount_flags(struct dentry *dentry) +{ + struct dentry *parent; + + /* root and dentrys in the root are already handled */ + if (IS_ROOT(dentry->d_parent)) + return; + + managed_dentry_set_managed(dentry); + + parent = dentry->d_parent; + /* only consider parents below dentrys in the root */ + if (IS_ROOT(parent->d_parent)) + return; + managed_dentry_clear_managed(parent); + return; +} + +static void autofs_clear_leaf_automount_flags(struct dentry *dentry) +{ + struct list_head *d_child; + struct dentry *parent; + + /* flags for dentrys in the root are handled elsewhere */ + if (IS_ROOT(dentry->d_parent)) + return; + + managed_dentry_clear_managed(dentry); + + parent = dentry->d_parent; + /* only consider parents below dentrys in the root */ + if (IS_ROOT(parent->d_parent)) + return; + d_child = &dentry->d_u.d_child; + /* Set parent managed if it's becoming empty */ + if (d_child->next == &parent->d_subdirs && + d_child->prev == &parent->d_subdirs) + managed_dentry_set_managed(parent); + return; +} + static int autofs4_dir_rmdir(struct inode *dir, struct dentry *dentry) { struct autofs_sb_info *sbi = autofs4_sbi(dir->i_sb); @@ -657,6 +709,9 @@ static int autofs4_dir_rmdir(struct inode *dir, struct dentry *dentry) spin_unlock(&dentry->d_lock); spin_unlock(&autofs4_lock); + if (sbi->version < 5) + autofs_clear_leaf_automount_flags(dentry); + if (atomic_dec_and_test(&ino->count)) { p_ino = autofs4_dentry_ino(dentry->d_parent); if (p_ino && dentry->d_parent != dentry) @@ -699,6 +754,9 @@ static int autofs4_dir_mkdir(struct inode *dir, struct dentry *dentry, int mode) } d_add(dentry, inode); + if (sbi->version < 5) + autofs_set_leaf_automount_flags(dentry); + dentry->d_fsdata = ino; ino->dentry = dget(dentry); atomic_inc(&ino->count); |