/usr/src/kernel-patches/lustre/patches/vfs_races-2.6.22-vanilla.patch is in linux-patch-lustre 1.8.5+dfsg-3ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 | Index: linux-2.6.22.5/fs/dcache.c
===================================================================
--- linux-2.6.22.5.orig/fs/dcache.c 2007-08-22 17:23:54.000000000 -0600
+++ linux-2.6.22.5/fs/dcache.c 2008-02-21 00:56:09.000000000 -0700
@@ -245,6 +245,13 @@
spin_unlock(&dcache_lock);
return 0;
}
+
+ /* network invalidation by Lustre */
+ if (dentry->d_flags & DCACHE_LUSTRE_INVALID) {
+ spin_unlock(&dcache_lock);
+ return 0;
+ }
+
/*
* Check whether to do a partial shrink_dcache
* to get rid of unused child entries.
@@ -1441,13 +1448,22 @@
* Adds a dentry to the hash according to its name.
*/
-void d_rehash(struct dentry * entry)
+void d_rehash_cond(struct dentry * entry, int lock)
{
- spin_lock(&dcache_lock);
+ if (lock)
+ spin_lock(&dcache_lock);
spin_lock(&entry->d_lock);
_d_rehash(entry);
spin_unlock(&entry->d_lock);
- spin_unlock(&dcache_lock);
+ if (lock)
+ spin_unlock(&dcache_lock);
+}
+
+EXPORT_SYMBOL(d_rehash_cond);
+
+void d_rehash(struct dentry * entry)
+{
+ d_rehash_cond(entry, 1);
}
/*
Index: linux-2.6.22.5/include/linux/dcache.h
===================================================================
--- linux-2.6.22.5.orig/include/linux/dcache.h 2007-08-22 17:23:54.000000000 -0600
+++ linux-2.6.22.5/include/linux/dcache.h 2008-02-21 00:56:09.000000000 -0700
@@ -174,6 +174,7 @@
#define DCACHE_REFERENCED 0x0008 /* Recently used, don't discard. */
#define DCACHE_UNHASHED 0x0010
+#define DCACHE_LUSTRE_INVALID 0x0040 /* Lustre invalidated */
#define DCACHE_INOTIFY_PARENT_WATCHED 0x0020 /* Parent inode is watched by inotify */
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