Btrfs: calc file extent num_bytes correctly in file clone

[linux-2.6.git] / fs / fs_struct.c

diff --git a/fs/fs_struct.c b/fs/fs_struct.c
index 68ca487bedb18e4d39b756659e6be33e6e633451..78b519c135365fb02d533441377ac4785abcb3ed 100644 (file)
--- a/fs/fs_struct.c
+++ b/fs/fs_struct.c
@@ -4,6 +4,19 @@
 #include <linux/path.h>
 #include <linux/slab.h>
 #include <linux/fs_struct.h>
+#include "internal.h"
+
+static inline void path_get_longterm(struct path *path)
+{
+       path_get(path);
+       mnt_make_longterm(path->mnt);
+}
+
+static inline void path_put_longterm(struct path *path)
+{
+       mnt_make_shortterm(path->mnt);
+       path_put(path);
+}
 
 /*
  * Replace the fs->{rootmnt,root} with {mnt,dentry}. Put the old values.
@@ -17,11 +30,11 @@ void set_fs_root(struct fs_struct *fs, struct path *path)
        write_seqcount_begin(&fs->seq);
        old_root = fs->root;
        fs->root = *path;
-       path_get_long(path);
+       path_get_longterm(path);
        write_seqcount_end(&fs->seq);
        spin_unlock(&fs->lock);
        if (old_root.dentry)
-               path_put_long(&old_root);
+               path_put_longterm(&old_root);
 }
 
 /*
@@ -36,12 +49,12 @@ void set_fs_pwd(struct fs_struct *fs, struct path *path)
        write_seqcount_begin(&fs->seq);
        old_pwd = fs->pwd;
        fs->pwd = *path;
-       path_get_long(path);
+       path_get_longterm(path);
        write_seqcount_end(&fs->seq);
        spin_unlock(&fs->lock);
 
        if (old_pwd.dentry)
-               path_put_long(&old_pwd);
+               path_put_longterm(&old_pwd);
 }
 
 void chroot_fs_refs(struct path *old_root, struct path *new_root)
@@ -59,13 +72,13 @@ void chroot_fs_refs(struct path *old_root, struct path *new_root)
                        write_seqcount_begin(&fs->seq);
                        if (fs->root.dentry == old_root->dentry
                            && fs->root.mnt == old_root->mnt) {
-                               path_get_long(new_root);
+                               path_get_longterm(new_root);
                                fs->root = *new_root;
                                count++;
                        }
                        if (fs->pwd.dentry == old_root->dentry
                            && fs->pwd.mnt == old_root->mnt) {
-                               path_get_long(new_root);
+                               path_get_longterm(new_root);
                                fs->pwd = *new_root;
                                count++;
                        }
@@ -76,13 +89,13 @@ void chroot_fs_refs(struct path *old_root, struct path *new_root)
        } while_each_thread(g, p);
        read_unlock(&tasklist_lock);
        while (count--)
-               path_put_long(old_root);
+               path_put_longterm(old_root);
 }
 
 void free_fs_struct(struct fs_struct *fs)
 {
-       path_put_long(&fs->root);
-       path_put_long(&fs->pwd);
+       path_put_longterm(&fs->root);
+       path_put_longterm(&fs->pwd);
        kmem_cache_free(fs_cachep, fs);
 }
 
@@ -118,9 +131,9 @@ struct fs_struct *copy_fs_struct(struct fs_struct *old)
 
                spin_lock(&old->lock);
                fs->root = old->root;
-               path_get_long(&fs->root);
+               path_get_longterm(&fs->root);
                fs->pwd = old->pwd;
-               path_get_long(&fs->pwd);
+               path_get_longterm(&fs->pwd);
                spin_unlock(&old->lock);
        }
        return fs;