Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 120 insertions, 0 deletions

diff --git a/fs/coda/cache.c b/fs/coda/cache.c
new file mode 100644
index 000000000000..80072fd9b7fa
--- /dev/null
+++ b/fs/coda/cache.c
@@ -0,0 +1,120 @@
+/*
+ * Cache operations for Coda.
+ * For Linux 2.1: (C) 1997 Carnegie Mellon University
+ * For Linux 2.3: (C) 2000 Carnegie Mellon University
+ *
+ * Carnegie Mellon encourages users of this code to contribute improvements
+ * to the Coda project http://www.coda.cs.cmu.edu/ <coda@cs.cmu.edu>.
+ */
+
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/time.h>
+#include <linux/fs.h>
+#include <linux/stat.h>
+#include <linux/errno.h>
+#include <asm/uaccess.h>
+#include <linux/string.h>
+#include <linux/list.h>
+
+#include <linux/coda.h>
+#include <linux/coda_linux.h>
+#include <linux/coda_psdev.h>
+#include <linux/coda_fs_i.h>
+#include <linux/coda_cache.h>
+
+static atomic_t permission_epoch = ATOMIC_INIT(0);
+
+/* replace or extend an acl cache hit */
+void coda_cache_enter(struct inode *inode, int mask)
+{
+        struct coda_inode_info *cii = ITOC(inode);
+
+        cii->c_cached_epoch = atomic_read(&permission_epoch);
+        if (cii->c_uid != current->fsuid) {
+                cii->c_uid = current->fsuid;
+                cii->c_cached_perm = mask;
+        } else
+                cii->c_cached_perm |= mask;
+}
+
+/* remove cached acl from an inode */
+void coda_cache_clear_inode(struct inode *inode)
+{
+        struct coda_inode_info *cii = ITOC(inode);
+        cii->c_cached_perm = 0;
+}
+
+/* remove all acl caches */
+void coda_cache_clear_all(struct super_block *sb)
+{
+        struct coda_sb_info *sbi;
+
+        sbi = coda_sbp(sb);
+        if (!sbi) BUG();
+
+        atomic_inc(&permission_epoch);
+}
+
+
+/* check if the mask has been matched against the acl already */
+int coda_cache_check(struct inode *inode, int mask)
+{
+        struct coda_inode_info *cii = ITOC(inode);
+        int hit;
+        
+        hit = (mask & cii->c_cached_perm) == mask &&
+                cii->c_uid == current->fsuid &&
+                cii->c_cached_epoch == atomic_read(&permission_epoch);
+
+        return hit;
+}
+
+
+/* Purging dentries and children */
+/* The following routines drop dentries which are not
+   in use and flag dentries which are in use to be 
+   zapped later.
+
+   The flags are detected by:
+   - coda_dentry_revalidate (for lookups) if the flag is C_PURGE
+   - coda_dentry_delete: to remove dentry from the cache when d_count
+     falls to zero
+   - an inode method coda_revalidate (for attributes) if the 
+     flag is C_VATTR
+*/
+
+/* this won't do any harm: just flag all children */
+static void coda_flag_children(struct dentry *parent, int flag)
+{
+        struct list_head *child;
+        struct dentry *de;
+
+        spin_lock(&dcache_lock);
+        list_for_each(child, &parent->d_subdirs)
+        {
+                de = list_entry(child, struct dentry, d_child);
+                /* don't know what to do with negative dentries */
+                if ( ! de->d_inode ) 
+                        continue;
+                coda_flag_inode(de->d_inode, flag);
+        }
+        spin_unlock(&dcache_lock);
+        return; 
+}
+
+void coda_flag_inode_children(struct inode *inode, int flag)
+{
+        struct dentry *alias_de;
+
+        if ( !inode || !S_ISDIR(inode->i_mode)) 
+                return; 
+
+        alias_de = d_find_alias(inode);
+        if (!alias_de)
+                return;
+        coda_flag_children(alias_de, flag);
+        shrink_dcache_parent(alias_de);
+        dput(alias_de);
+}
+