Networked file systems may wish to forego dentry caching altogether, so
every lookup goes over the network and stale data is avoided.
Provide a no_revalidate_d_ops helper object that does this.
Signed-off-by: Ahmad Fatoum <ahmad@xxxxxx>
---
fs/fs.c | 9 +++++++++
include/linux/dcache.h | 2 ++
2 files changed, 11 insertions(+)
diff --git a/fs/fs.c b/fs/fs.c
index c6cb49996ec5..dda19db91341 100644
--- a/fs/fs.c
+++ b/fs/fs.c
@@ -1262,6 +1262,15 @@ static void d_invalidate(struct dentry *dentry)
{
}
+static int d_no_revalidate(struct dentry *dir, unsigned int flags)
+{
+ return 0;
+}
+
+const struct dentry_operations no_revalidate_d_ops = {
+ .d_revalidate = d_no_revalidate,
+};
+
static inline int d_revalidate(struct dentry *dentry, unsigned int flags)
{
if (unlikely(dentry->d_flags & DCACHE_OP_REVALIDATE))
diff --git a/include/linux/dcache.h b/include/linux/dcache.h
index 1581ddc701d3..a9619422013e 100644
--- a/include/linux/dcache.h
+++ b/include/linux/dcache.h
@@ -185,4 +185,6 @@ static inline struct inode *d_inode(const struct dentry *dentry)
char *dpath(struct dentry *dentry, struct dentry *root);
+extern const struct dentry_operations no_revalidate_d_ops;
+
#endif /* __LINUX_DCACHE_H */
--
2.20.1
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