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fs: rcu-walk aware d_revalidate method

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Require filesystems be aware of .d_revalidate being called in rcu-walk
mode (nd->flags & LOOKUP_RCU). For now do a simple push down, returning
-ECHILD from all implementations.

Signed-off-by: Nick Piggin <[email protected]>
This commit is contained in:
Nick Piggin 2011-01-07 17:49:57 +11:00
commit 34286d6662
27 changed files with 215 additions and 61 deletions
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6
fs/fat/namei_vfat.c
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@ -43,6 +43,9 @@ static int vfat_revalidate_shortname(struct dentry *dentry)
static int vfat_revalidate(struct dentry *dentry, struct nameidata *nd)
{
if (nd->flags & LOOKUP_RCU)
return -ECHILD;
/* This is not negative dentry. Always valid. */
if (dentry->d_inode)
return 1;
@ -51,6 +54,9 @@ static int vfat_revalidate(struct dentry *dentry, struct nameidata *nd)
static int vfat_revalidate_ci(struct dentry *dentry, struct nameidata *nd)
{
if (nd->flags & LOOKUP_RCU)
return -ECHILD;
/*
* This is not negative dentry. Always valid.
*