Merge branch 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mfashe...

[pandora-kernel.git] / fs / dcache.c

diff --git a/fs/dcache.c b/fs/dcache.c
index 3ee588d..6068c25 100644 (file)
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -17,6 +17,7 @@
 #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>
@@ -106,9 +107,10 @@ static void dentry_lru_remove(struct dentry *dentry)
 /*
  * Release the dentry's inode, using the filesystem
  * d_iput() operation if defined.
- * Called with dcache_lock and per dentry lock held, drops both.
  */
 static void dentry_iput(struct dentry * dentry)
+       __releases(dentry->d_lock)
+       __releases(dcache_lock)
 {
        struct inode *inode = dentry->d_inode;
        if (inode) {
@@ -132,12 +134,13 @@ static void dentry_iput(struct dentry * dentry)
  * d_kill - kill dentry and return parent
  * @dentry: dentry to kill
  *
- * Called with dcache_lock and d_lock, releases both.  The dentry must
- * already be unhashed and removed from the LRU.
+ * The dentry must already be unhashed and removed from the LRU.
  *
  * If this is the root of the dentry tree, return NULL.
  */
 static struct dentry *d_kill(struct dentry *dentry)
+       __releases(dentry->d_lock)
+       __releases(dcache_lock)
 {
        struct dentry *parent;
 
@@ -383,11 +386,11 @@ restart:
  * Try to prune ancestors as well.  This is necessary to prevent
  * quadratic behavior of shrink_dcache_parent(), but is also expected
  * to be beneficial in reducing dentry cache fragmentation.
- *
- * Called with dcache_lock, drops it and then regains.
- * Called with dentry->d_lock held, drops it.
  */
 static void prune_one_dentry(struct dentry * dentry)
+       __releases(dentry->d_lock)
+       __releases(dcache_lock)
+       __acquires(dcache_lock)
 {
        __d_drop(dentry);
        dentry = d_kill(dentry);
@@ -1604,10 +1607,9 @@ static int d_isparent(struct dentry *p1, struct dentry *p2)
  *
  * Note: If ever the locking in lock_rename() changes, then please
  * remember to update this too...
- *
- * On return, dcache_lock will have been unlocked.
  */
 static struct dentry *__d_unalias(struct dentry *dentry, struct dentry *alias)
+       __releases(dcache_lock)
 {
        struct mutex *m1 = NULL, *m2 = NULL;
        struct dentry *ret;
@@ -1743,11 +1745,9 @@ out_nolock:
 shouldnt_be_hashed:
        spin_unlock(&dcache_lock);
        BUG();
-       goto shouldnt_be_hashed;
 }
 
-static int prepend(char **buffer, int *buflen, const char *str,
-                         int namelen)
+static int prepend(char **buffer, int *buflen, const char *str, int namelen)
 {
        *buflen -= namelen;
        if (*buflen < 0)
@@ -1757,8 +1757,13 @@ static int prepend(char **buffer, int *buflen, const char *str,
        return 0;
 }
 
+static int prepend_name(char **buffer, int *buflen, struct qstr *name)
+{
+       return prepend(buffer, buflen, name->name, name->len);
+}
+
 /**
- * d_path - return the path of a dentry
+ * __d_path - return the path of a dentry
  * @path: the dentry/vfsmount to report
  * @root: root vfsmnt/dentry (may be modified by this function)
  * @buffer: buffer to return value in
@@ -1779,9 +1784,10 @@ char *__d_path(const struct path *path, struct path *root,
 {
        struct dentry *dentry = path->dentry;
        struct vfsmount *vfsmnt = path->mnt;
-       char * end = buffer+buflen;
-       char * retval;
+       char *end = buffer + buflen;
+       char *retval;
 
+       spin_lock(&vfsmount_lock);
        prepend(&end, &buflen, "\0", 1);
        if (!IS_ROOT(dentry) && d_unhashed(dentry) &&
                (prepend(&end, &buflen, " (deleted)", 10) != 0))
@@ -1800,38 +1806,37 @@ char *__d_path(const struct path *path, struct path *root,
                        break;
                if (dentry == vfsmnt->mnt_root || IS_ROOT(dentry)) {
                        /* Global root? */
-                       spin_lock(&vfsmount_lock);
                        if (vfsmnt->mnt_parent == vfsmnt) {
-                               spin_unlock(&vfsmount_lock);
                                goto global_root;
                        }
                        dentry = vfsmnt->mnt_mountpoint;
                        vfsmnt = vfsmnt->mnt_parent;
-                       spin_unlock(&vfsmount_lock);
                        continue;
                }
                parent = dentry->d_parent;
                prefetch(parent);
-               if ((prepend(&end, &buflen, dentry->d_name.name,
-                               dentry->d_name.len) != 0) ||
+               if ((prepend_name(&end, &buflen, &dentry->d_name) != 0) ||
                    (prepend(&end, &buflen, "/", 1) != 0))
                        goto Elong;
                retval = end;
                dentry = parent;
        }
 
+out:
+       spin_unlock(&vfsmount_lock);
        return retval;
 
 global_root:
        retval += 1;    /* hit the slash */
-       if (prepend(&retval, &buflen, dentry->d_name.name,
-                   dentry->d_name.len) != 0)
+       if (prepend_name(&retval, &buflen, &dentry->d_name) != 0)
                goto Elong;
        root->mnt = vfsmnt;
        root->dentry = dentry;
-       return retval;
+       goto out;
+
 Elong:
-       return ERR_PTR(-ENAMETOOLONG);
+       retval = ERR_PTR(-ENAMETOOLONG);
+       goto out;
 }
 
 /**
@@ -1845,9 +1850,9 @@ Elong:
  *
  * Returns the buffer or an error code if the path was too long.
  *
- * "buflen" should be positive. Caller holds the dcache_lock.
+ * "buflen" should be positive.
  */
-char *d_path(struct path *path, char *buf, int buflen)
+char *d_path(const struct path *path, char *buf, int buflen)
 {
        char *res;
        struct path root;
@@ -1915,16 +1920,11 @@ char *dentry_path(struct dentry *dentry, char *buf, int buflen)
        retval = end-1;
        *retval = '/';
 
-       for (;;) {
-               struct dentry *parent;
-               if (IS_ROOT(dentry))
-                       break;
+       while (!IS_ROOT(dentry)) {
+               struct dentry *parent = dentry->d_parent;
 
-               parent = dentry->d_parent;
                prefetch(parent);
-
-               if ((prepend(&end, &buflen, dentry->d_name.name,
-                               dentry->d_name.len) != 0) ||
+               if ((prepend_name(&end, &buflen, &dentry->d_name) != 0) ||
                    (prepend(&end, &buflen, "/", 1) != 0))
                        goto Elong;
 
@@ -1975,7 +1975,7 @@ asmlinkage long sys_getcwd(char __user *buf, unsigned long size)
        error = -ENOENT;
        /* Has the current directory has been unlinked? */
        spin_lock(&dcache_lock);
-       if (pwd.dentry->d_parent == pwd.dentry || !d_unhashed(pwd.dentry)) {
+       if (IS_ROOT(pwd.dentry) || !d_unhashed(pwd.dentry)) {
                unsigned long len;
                struct path tmp = root;
                char * cwd;