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authorDavid Howells <dhowells@redhat.com>2015-01-29 12:02:28 +0000
committerAl Viro <viro@zeniv.linux.org.uk>2015-02-22 11:38:38 -0500
commitdf1a085af1f652a02238168c4f2b730c8c90dd4a (patch)
treee9f269431a6ed4ec7a70de68cd9b62b0bcbe2dea /fs
parente7f7d2253c05143ed76ddc5e11f4cf0a9b814a27 (diff)
downloadlinux-df1a085af1f652a02238168c4f2b730c8c90dd4a.tar.bz2
VFS: Add a fallthrough flag for marking virtual dentries
Add a DCACHE_FALLTHRU flag to indicate that, in a layered filesystem, this is a virtual dentry that covers another one in a lower layer that should be used instead. This may be recorded on medium if directory integration is stored there. The flag can be set with d_set_fallthru() and tested with d_is_fallthru(). Original-author: Valerie Aurora <vaurora@redhat.com> Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs')
-rw-r--r--fs/dcache.c19
1 files changed, 18 insertions, 1 deletions
diff --git a/fs/dcache.c b/fs/dcache.c
index dc400fd29f4d..e33a0934efd7 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -1659,6 +1659,22 @@ void d_set_d_op(struct dentry *dentry, const struct dentry_operations *op)
}
EXPORT_SYMBOL(d_set_d_op);
+
+/*
+ * d_set_fallthru - Mark a dentry as falling through to a lower layer
+ * @dentry - The dentry to mark
+ *
+ * Mark a dentry as falling through to the lower layer (as set with
+ * d_pin_lower()). This flag may be recorded on the medium.
+ */
+void d_set_fallthru(struct dentry *dentry)
+{
+ spin_lock(&dentry->d_lock);
+ dentry->d_flags |= DCACHE_FALLTHRU;
+ spin_unlock(&dentry->d_lock);
+}
+EXPORT_SYMBOL(d_set_fallthru);
+
static unsigned d_flags_for_inode(struct inode *inode)
{
unsigned add_flags = DCACHE_FILE_TYPE;
@@ -1691,7 +1707,8 @@ static void __d_instantiate(struct dentry *dentry, struct inode *inode)
unsigned add_flags = d_flags_for_inode(inode);
spin_lock(&dentry->d_lock);
- __d_set_type(dentry, add_flags);
+ dentry->d_flags &= ~(DCACHE_ENTRY_TYPE | DCACHE_FALLTHRU);
+ dentry->d_flags |= add_flags;
if (inode)
hlist_add_head(&dentry->d_u.d_alias, &inode->i_dentry);
dentry->d_inode = inode;