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-rw-r--r--fs/namespace.c61
1 files changed, 1 insertions, 60 deletions
diff --git a/fs/namespace.c b/fs/namespace.c
index 0a42e0e9602..c6f54e4c429 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -27,6 +27,7 @@
27#include <linux/ramfs.h> 27#include <linux/ramfs.h>
28#include <linux/log2.h> 28#include <linux/log2.h>
29#include <linux/idr.h> 29#include <linux/idr.h>
30#include <linux/fs_struct.h>
30#include <asm/uaccess.h> 31#include <asm/uaccess.h>
31#include <asm/unistd.h> 32#include <asm/unistd.h>
32#include "pnode.h" 33#include "pnode.h"
@@ -2093,66 +2094,6 @@ out1:
2093} 2094}
2094 2095
2095/* 2096/*
2096 * Replace the fs->{rootmnt,root} with {mnt,dentry}. Put the old values.
2097 * It can block. Requires the big lock held.
2098 */
2099void set_fs_root(struct fs_struct *fs, struct path *path)
2100{
2101 struct path old_root;
2102
2103 write_lock(&fs->lock);
2104 old_root = fs->root;
2105 fs->root = *path;
2106 path_get(path);
2107 write_unlock(&fs->lock);
2108 if (old_root.dentry)
2109 path_put(&old_root);
2110}
2111
2112/*
2113 * Replace the fs->{pwdmnt,pwd} with {mnt,dentry}. Put the old values.
2114 * It can block. Requires the big lock held.
2115 */
2116void set_fs_pwd(struct fs_struct *fs, struct path *path)
2117{
2118 struct path old_pwd;
2119
2120 write_lock(&fs->lock);
2121 old_pwd = fs->pwd;
2122 fs->pwd = *path;
2123 path_get(path);
2124 write_unlock(&fs->lock);
2125
2126 if (old_pwd.dentry)
2127 path_put(&old_pwd);
2128}
2129
2130static void chroot_fs_refs(struct path *old_root, struct path *new_root)
2131{
2132 struct task_struct *g, *p;
2133 struct fs_struct *fs;
2134
2135 read_lock(&tasklist_lock);
2136 do_each_thread(g, p) {
2137 task_lock(p);
2138 fs = p->fs;
2139 if (fs) {
2140 atomic_inc(&fs->count);
2141 task_unlock(p);
2142 if (fs->root.dentry == old_root->dentry
2143 && fs->root.mnt == old_root->mnt)
2144 set_fs_root(fs, new_root);
2145 if (fs->pwd.dentry == old_root->dentry
2146 && fs->pwd.mnt == old_root->mnt)
2147 set_fs_pwd(fs, new_root);
2148 put_fs_struct(fs);
2149 } else
2150 task_unlock(p);
2151 } while_each_thread(g, p);
2152 read_unlock(&tasklist_lock);
2153}
2154
2155/*
2156 * pivot_root Semantics: 2097 * pivot_root Semantics:
2157 * Moves the root file system of the current process to the directory put_old, 2098 * Moves the root file system of the current process to the directory put_old,
2158 * makes new_root as the new root file system of the current process, and sets 2099 * makes new_root as the new root file system of the current process, and sets