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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/sysfs/dir.c
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@ -239,9 +239,13 @@ static int sysfs_dentry_delete(const struct dentry *dentry)
static int sysfs_dentry_revalidate(struct dentry *dentry, struct nameidata *nd)
{
struct sysfs_dirent *sd = dentry->d_fsdata;
struct sysfs_dirent *sd;
int is_dir;
if (nd->flags & LOOKUP_RCU)
return -ECHILD;
sd = dentry->d_fsdata;
mutex_lock(&sysfs_mutex);
/* The sysfs dirent has been deleted */