From df1a085af1f652a02238168c4f2b730c8c90dd4a Mon Sep 17 00:00:00 2001 From: David Howells Date: Thu, 29 Jan 2015 12:02:28 +0000 Subject: 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 Signed-off-by: David Howells Signed-off-by: Al Viro --- fs/dcache.c | 19 ++++++++++++++++++- 1 file changed, 18 insertions(+), 1 deletion(-) (limited to 'fs/dcache.c') 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; -- cgit v1.2.3