X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=fs%2Fdcache.c;h=953173a293a93e3d8174e7d5955a70f535a75fb5;hb=3daeb42c13567e1505f233f6a699cc0e23c8ab5a;hp=07e2d4a44bda3204c083a6e38ef79fe9b144d958;hpb=adc487204a9373d2b5a535412466326036147a72;p=safe%2Fjmp%2Flinux-2.6

diff --git a/fs/dcache.c b/fs/dcache.c
index 07e2d4a..953173a 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -17,7 +17,6 @@
 #include <linux/syscalls.h>
 #include <linux/string.h>
 #include <linux/mm.h>
-#include <linux/fdtable.h>
 #include <linux/fs.h>
 #include <linux/fsnotify.h>
 #include <linux/slab.h>
@@ -32,6 +31,8 @@
 #include <linux/seqlock.h>
 #include <linux/swap.h>
 #include <linux/bootmem.h>
+#include <linux/fs_struct.h>
+#include <linux/hardirq.h>
 #include "internal.h"
 
 int sysctl_vfs_cache_pressure __read_mostly = 100;
@@ -481,7 +482,7 @@ restart:
 			if ((flags & DCACHE_REFERENCED)
 				&& (dentry->d_flags & DCACHE_REFERENCED)) {
 				dentry->d_flags &= ~DCACHE_REFERENCED;
-				list_move_tail(&dentry->d_lru, &referenced);
+				list_move(&dentry->d_lru, &referenced);
 				spin_unlock(&dentry->d_lock);
 			} else {
 				list_move_tail(&dentry->d_lru, &tmp);
@@ -977,6 +978,7 @@ struct dentry *d_alloc_name(struct dentry *parent, const char *name)
 	q.hash = full_name_hash(q.name, q.len);
 	return d_alloc(parent, &q);
 }
+EXPORT_SYMBOL(d_alloc_name);
 
 /* the caller must hold dcache_lock */
 static void __d_instantiate(struct dentry *dentry, struct inode *inode)
@@ -1247,15 +1249,18 @@ struct dentry *d_add_ci(struct dentry *dentry, struct inode *inode,
 	struct dentry *found;
 	struct dentry *new;
 
-	/* Does a dentry matching the name exist already? */
+	/*
+	 * First check if a dentry matching the name already exists,
+	 * if not go ahead and create it now.
+	 */
 	found = d_hash_and_lookup(dentry->d_parent, name);
-	/* If not, create it now and return */
 	if (!found) {
 		new = d_alloc(dentry->d_parent, name);
 		if (!new) {
 			error = -ENOMEM;
 			goto err_out;
 		}
+
 		found = d_splice_alias(inode, new);
 		if (found) {
 			dput(new);
@@ -1263,61 +1268,46 @@ struct dentry *d_add_ci(struct dentry *dentry, struct inode *inode,
 		}
 		return new;
 	}
-	/* Matching dentry exists, check if it is negative. */
+
+	/*
+	 * If a matching dentry exists, and it's not negative use it.
+	 *
+	 * Decrement the reference count to balance the iget() done
+	 * earlier on.
+	 */
 	if (found->d_inode) {
 		if (unlikely(found->d_inode != inode)) {
 			/* This can't happen because bad inodes are unhashed. */
 			BUG_ON(!is_bad_inode(inode));
 			BUG_ON(!is_bad_inode(found->d_inode));
 		}
-		/*
-		 * Already have the inode and the dentry attached, decrement
-		 * the reference count to balance the iget() done
-		 * earlier on.  We found the dentry using d_lookup() so it
-		 * cannot be disconnected and thus we do not need to worry
-		 * about any NFS/disconnectedness issues here.
-		 */
 		iput(inode);
 		return found;
 	}
+
 	/*
 	 * Negative dentry: instantiate it unless the inode is a directory and
-	 * has a 'disconnected' dentry (i.e. IS_ROOT and DCACHE_DISCONNECTED),
-	 * in which case d_move() that in place of the found dentry.
+	 * already has a dentry.
 	 */
-	if (!S_ISDIR(inode->i_mode)) {
-		/* Not a directory; everything is easy. */
-		d_instantiate(found, inode);
-		return found;
-	}
 	spin_lock(&dcache_lock);
-	if (list_empty(&inode->i_dentry)) {
-		/*
-		 * Directory without a 'disconnected' dentry; we need to do
-		 * d_instantiate() by hand because it takes dcache_lock which
-		 * we already hold.
-		 */
+	if (!S_ISDIR(inode->i_mode) || list_empty(&inode->i_dentry)) {
 		__d_instantiate(found, inode);
 		spin_unlock(&dcache_lock);
 		security_d_instantiate(found, inode);
 		return found;
 	}
+
 	/*
-	 * Directory with a 'disconnected' dentry; get a reference to the
-	 * 'disconnected' dentry.
+	 * In case a directory already has a (disconnected) entry grab a
+	 * reference to it, move it in place and use it.
 	 */
 	new = list_entry(inode->i_dentry.next, struct dentry, d_alias);
 	dget_locked(new);
 	spin_unlock(&dcache_lock);
-	/* Do security vodoo. */
 	security_d_instantiate(found, inode);
-	/* Move new in place of found. */
 	d_move(new, found);
-	/* Balance the iget() we did above. */
 	iput(inode);
-	/* Throw away found. */
 	dput(found);
-	/* Use new as the actual dentry. */
 	return new;
 
 err_out:
@@ -1922,7 +1912,7 @@ char *__d_path(const struct path *path, struct path *root,
 
 	spin_lock(&vfsmount_lock);
 	prepend(&end, &buflen, "\0", 1);
-	if (!IS_ROOT(dentry) && d_unhashed(dentry) &&
+	if (d_unlinked(dentry) &&
 		(prepend(&end, &buflen, " (deleted)", 10) != 0))
 			goto Elong;
 
@@ -2047,7 +2037,7 @@ char *dentry_path(struct dentry *dentry, char *buf, int buflen)
 
 	spin_lock(&dcache_lock);
 	prepend(&end, &buflen, "\0", 1);
-	if (!IS_ROOT(dentry) && d_unhashed(dentry) &&
+	if (d_unlinked(dentry) &&
 		(prepend(&end, &buflen, "//deleted", 9) != 0))
 			goto Elong;
 	if (buflen < 1)
@@ -2109,9 +2099,8 @@ SYSCALL_DEFINE2(getcwd, char __user *, buf, unsigned long, size)
 	read_unlock(&current->fs->lock);
 
 	error = -ENOENT;
-	/* Has the current directory has been unlinked? */
 	spin_lock(&dcache_lock);
-	if (IS_ROOT(pwd.dentry) || !d_unhashed(pwd.dentry)) {
+	if (!d_unlinked(pwd.dentry)) {
 		unsigned long len;
 		struct path tmp = root;
 		char * cwd;
@@ -2161,7 +2150,6 @@ int is_subdir(struct dentry *new_dentry, struct dentry *old_dentry)
 	int result;
 	unsigned long seq;
 
-	/* FIXME: This is old behavior, needed? Please check callers. */
 	if (new_dentry == old_dentry)
 		return 1;