Track negative entries v3
Track negative dentries by recording the generation number of the parent
directory in d_fsdata. The generation number for the parent directory is
recorded in the inode_info, which increments every time the lock on the
directory is dropped.
If the generation number of the parent directory and the negative dentry
matches, there is no need to perform the revalidate, else a revalidate
is forced. This improves performance in situations where nodes look for
the same non-existent file multiple times.
Thanks Mark for explaining the DLM sequence.
Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.de>
Signed-off-by: Joel Becker <joel.becker@oracle.com>
diff --git a/fs/ocfs2/dcache.c b/fs/ocfs2/dcache.c
index b4957c7..edaded4 100644
--- a/fs/ocfs2/dcache.c
+++ b/fs/ocfs2/dcache.c
@@ -40,6 +40,14 @@
#include "inode.h"
#include "super.h"
+void ocfs2_dentry_attach_gen(struct dentry *dentry)
+{
+ unsigned long gen =
+ OCFS2_I(dentry->d_parent->d_inode)->ip_dir_lock_gen;
+ BUG_ON(dentry->d_inode);
+ dentry->d_fsdata = (void *)gen;
+}
+
static int ocfs2_dentry_revalidate(struct dentry *dentry,
struct nameidata *nd)
@@ -51,11 +59,20 @@
mlog_entry("(0x%p, '%.*s')\n", dentry,
dentry->d_name.len, dentry->d_name.name);
- /* Never trust a negative dentry - force a new lookup. */
+ /* For a negative dentry -
+ * check the generation number of the parent and compare with the
+ * one stored in the inode.
+ */
if (inode == NULL) {
- mlog(0, "negative dentry: %.*s\n", dentry->d_name.len,
- dentry->d_name.name);
- goto bail;
+ unsigned long gen = (unsigned long) dentry->d_fsdata;
+ unsigned long pgen =
+ OCFS2_I(dentry->d_parent->d_inode)->ip_dir_lock_gen;
+ mlog(0, "negative dentry: %.*s parent gen: %lu "
+ "dentry gen: %lu\n",
+ dentry->d_name.len, dentry->d_name.name, pgen, gen);
+ if (gen != pgen)
+ goto bail;
+ goto valid;
}
BUG_ON(!osb);
@@ -96,6 +113,7 @@
goto bail;
}
+valid:
ret = 1;
bail:
@@ -227,6 +245,12 @@
if (!inode)
return 0;
+ if (!dentry->d_inode && dentry->d_fsdata) {
+ /* Converting a negative dentry to positive
+ Clear dentry->d_fsdata */
+ dentry->d_fsdata = dl = NULL;
+ }
+
if (dl) {
mlog_bug_on_msg(dl->dl_parent_blkno != parent_blkno,
" \"%.*s\": old parent: %llu, new: %llu\n",
@@ -452,6 +476,7 @@
out:
iput(inode);
+ ocfs2_dentry_attach_gen(dentry);
}
/*