1 files changed, 89 insertions, 34 deletions

diff --git a/fs/open.c b/fs/open.c
index f53a5b9ffb7d..70e0230d8e77 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -16,9 +16,11 @@
 #include <linux/tty.h>
 #include <linux/namei.h>
 #include <linux/backing-dev.h>
+#include <linux/capability.h>
 #include <linux/security.h>
 #include <linux/mount.h>
 #include <linux/vfs.h>
+#include <linux/fcntl.h>
 #include <asm/uaccess.h>
 #include <linux/fs.h>
 #include <linux/personality.h>
@@ -194,7 +196,8 @@ out:
         return error;
 }
 
-int do_truncate(struct dentry *dentry, loff_t length, struct file *filp)
+int do_truncate(struct dentry *dentry, loff_t length, unsigned int time_attrs,
+        struct file *filp)
 {
         int err;
         struct iattr newattrs;
@@ -204,19 +207,19 @@ int do_truncate(struct dentry *dentry, loff_t length, struct file *filp)
                 return -EINVAL;
 
         newattrs.ia_size = length;
-        newattrs.ia_valid = ATTR_SIZE | ATTR_CTIME;
+        newattrs.ia_valid = ATTR_SIZE | time_attrs;
         if (filp) {
                 newattrs.ia_file = filp;
                 newattrs.ia_valid |= ATTR_FILE;
         }
 
-        down(&dentry->d_inode->i_sem);
+        mutex_lock(&dentry->d_inode->i_mutex);
         err = notify_change(dentry, &newattrs);
-        up(&dentry->d_inode->i_sem);
+        mutex_unlock(&dentry->d_inode->i_mutex);
         return err;
 }
 
-static inline long do_sys_truncate(const char __user * path, loff_t length)
+static long do_sys_truncate(const char __user * path, loff_t length)
 {
         struct nameidata nd;
         struct inode * inode;
@@ -266,7 +269,7 @@ static inline long do_sys_truncate(const char __user * path, loff_t length)
         error = locks_verify_truncate(inode, NULL, length);
         if (!error) {
                 DQUOT_INIT(inode);
-                error = do_truncate(nd.dentry, length, NULL);
+                error = do_truncate(nd.dentry, length, 0, NULL);
         }
         put_write_access(inode);
 
@@ -282,7 +285,7 @@ asmlinkage long sys_truncate(const char __user * path, unsigned long length)
         return do_sys_truncate(path, (long)length);
 }
 
-static inline long do_sys_ftruncate(unsigned int fd, loff_t length, int small)
+static long do_sys_ftruncate(unsigned int fd, loff_t length, int small)
 {
         struct inode * inode;
         struct dentry *dentry;
@@ -318,7 +321,7 @@ static inline long do_sys_ftruncate(unsigned int fd, loff_t length, int small)
 
         error = locks_verify_truncate(inode, file, length);
         if (!error)
-                error = do_truncate(dentry, length, file);
+                error = do_truncate(dentry, length, 0, file);
 out_putf:
         fput(file);
 out:
@@ -381,7 +384,7 @@ asmlinkage long sys_utime(char __user * filename, struct utimbuf __user * times)
 
                 error = get_user(newattrs.ia_atime.tv_sec, &times->actime);
                 newattrs.ia_atime.tv_nsec = 0;
-                if (!error) 
+                if (!error)
                         error = get_user(newattrs.ia_mtime.tv_sec, &times->modtime);
                 newattrs.ia_mtime.tv_nsec = 0;
                 if (error)
@@ -397,9 +400,9 @@ asmlinkage long sys_utime(char __user * filename, struct utimbuf __user * times)
                     (error = vfs_permission(&nd, MAY_WRITE)) != 0)
                         goto dput_and_out;
         }
-        down(&inode->i_sem);
+        mutex_lock(&inode->i_mutex);
         error = notify_change(nd.dentry, &newattrs);
-        up(&inode->i_sem);
+        mutex_unlock(&inode->i_mutex);
 dput_and_out:
         path_release(&nd);
 out:
@@ -412,14 +415,14 @@ out:
  * must be owner or have write permission.
  * Else, update from *times, must be owner or super user.
  */
-long do_utimes(char __user * filename, struct timeval * times)
+long do_utimes(int dfd, char __user *filename, struct timeval *times)
 {
         int error;
         struct nameidata nd;
         struct inode * inode;
         struct iattr newattrs;
 
-        error = user_path_walk(filename, &nd);
+        error = __user_walk_fd(dfd, filename, LOOKUP_FOLLOW, &nd);
 
         if (error)
                 goto out;
@@ -450,22 +453,27 @@ long do_utimes(char __user * filename, struct timeval * times)
                     (error = vfs_permission(&nd, MAY_WRITE)) != 0)
                         goto dput_and_out;
         }
-        down(&inode->i_sem);
+        mutex_lock(&inode->i_mutex);
         error = notify_change(nd.dentry, &newattrs);
-        up(&inode->i_sem);
+        mutex_unlock(&inode->i_mutex);
 dput_and_out:
         path_release(&nd);
 out:
         return error;
 }
 
-asmlinkage long sys_utimes(char __user * filename, struct timeval __user * utimes)
+asmlinkage long sys_futimesat(int dfd, char __user *filename, struct timeval __user *utimes)
 {
         struct timeval times[2];
 
         if (utimes && copy_from_user(&times, utimes, sizeof(times)))
                 return -EFAULT;
-        return do_utimes(filename, utimes ? times : NULL);
+        return do_utimes(dfd, filename, utimes ? times : NULL);
+}
+
+asmlinkage long sys_utimes(char __user *filename, struct timeval __user *utimes)
+{
+        return sys_futimesat(AT_FDCWD, filename, utimes);
 }
 
 
@@ -474,7 +482,7 @@ asmlinkage long sys_utimes(char __user * filename, struct timeval __user * utime
  * We do this by temporarily clearing all FS-related capabilities and
  * switching the fsuid/fsgid around to the real ones.
  */
-asmlinkage long sys_access(const char __user * filename, int mode)
+asmlinkage long sys_faccessat(int dfd, const char __user *filename, int mode)
 {
         struct nameidata nd;
         int old_fsuid, old_fsgid;
@@ -504,7 +512,7 @@ asmlinkage long sys_access(const char __user * filename, int mode)
         else
                 current->cap_effective = current->cap_permitted;
 
-        res = __user_walk(filename, LOOKUP_FOLLOW|LOOKUP_ACCESS, &nd);
+        res = __user_walk_fd(dfd, filename, LOOKUP_FOLLOW|LOOKUP_ACCESS, &nd);
         if (!res) {
                 res = vfs_permission(&nd, mode);
                 /* SuS v2 requires we report a read only fs too */
@@ -521,6 +529,11 @@ asmlinkage long sys_access(const char __user * filename, int mode)
         return res;
 }
 
+asmlinkage long sys_access(const char __user *filename, int mode)
+{
+        return sys_faccessat(AT_FDCWD, filename, mode);
+}
+
 asmlinkage long sys_chdir(const char __user * filename)
 {
         struct nameidata nd;
@@ -619,13 +632,13 @@ asmlinkage long sys_fchmod(unsigned int fd, mode_t mode)
         err = -EPERM;
         if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
                 goto out_putf;
-        down(&inode->i_sem);
+        mutex_lock(&inode->i_mutex);
         if (mode == (mode_t) -1)
                 mode = inode->i_mode;
         newattrs.ia_mode = (mode & S_IALLUGO) | (inode->i_mode & ~S_IALLUGO);
         newattrs.ia_valid = ATTR_MODE | ATTR_CTIME;
         err = notify_change(dentry, &newattrs);
-        up(&inode->i_sem);
+        mutex_unlock(&inode->i_mutex);
 
 out_putf:
         fput(file);
@@ -633,14 +646,15 @@ out:
         return err;
 }
 
-asmlinkage long sys_chmod(const char __user * filename, mode_t mode)
+asmlinkage long sys_fchmodat(int dfd, const char __user *filename,
+                             mode_t mode)
 {
         struct nameidata nd;
         struct inode * inode;
         int error;
         struct iattr newattrs;
 
-        error = user_path_walk(filename, &nd);
+        error = __user_walk_fd(dfd, filename, LOOKUP_FOLLOW, &nd);
         if (error)
                 goto out;
         inode = nd.dentry->d_inode;
@@ -653,13 +667,13 @@ asmlinkage long sys_chmod(const char __user * filename, mode_t mode)
         if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
                 goto dput_and_out;
 
-        down(&inode->i_sem);
+        mutex_lock(&inode->i_mutex);
         if (mode == (mode_t) -1)
                 mode = inode->i_mode;
         newattrs.ia_mode = (mode & S_IALLUGO) | (inode->i_mode & ~S_IALLUGO);
         newattrs.ia_valid = ATTR_MODE | ATTR_CTIME;
         error = notify_change(nd.dentry, &newattrs);
-        up(&inode->i_sem);
+        mutex_unlock(&inode->i_mutex);
 
 dput_and_out:
         path_release(&nd);
@@ -667,6 +681,11 @@ out:
         return error;
 }
 
+asmlinkage long sys_chmod(const char __user *filename, mode_t mode)
+{
+        return sys_fchmodat(AT_FDCWD, filename, mode);
+}
+
 static int chown_common(struct dentry * dentry, uid_t user, gid_t group)
 {
         struct inode * inode;
@@ -695,9 +714,9 @@ static int chown_common(struct dentry * dentry, uid_t user, gid_t group)
         }
         if (!S_ISDIR(inode->i_mode))
                 newattrs.ia_valid |= ATTR_KILL_SUID|ATTR_KILL_SGID;
-        down(&inode->i_sem);
+        mutex_lock(&inode->i_mutex);
         error = notify_change(dentry, &newattrs);
-        up(&inode->i_sem);
+        mutex_unlock(&inode->i_mutex);
 out:
         return error;
 }
@@ -715,6 +734,26 @@ asmlinkage long sys_chown(const char __user * filename, uid_t user, gid_t group)
         return error;
 }
 
+asmlinkage long sys_fchownat(int dfd, const char __user *filename, uid_t user,
+                             gid_t group, int flag)
+{
+        struct nameidata nd;
+        int error = -EINVAL;
+        int follow;
+
+        if ((flag & ~AT_SYMLINK_NOFOLLOW) != 0)
+                goto out;
+
+        follow = (flag & AT_SYMLINK_NOFOLLOW) ? 0 : LOOKUP_FOLLOW;
+        error = __user_walk_fd(dfd, filename, follow, &nd);
+        if (!error) {
+                error = chown_common(nd.dentry, user, group);
+                path_release(&nd);
+        }
+out:
+        return error;
+}
+
 asmlinkage long sys_lchown(const char __user * filename, uid_t user, gid_t group)
 {
         struct nameidata nd;
@@ -818,7 +857,8 @@ cleanup_file:
  * for the internal routines (ie open_namei()/follow_link() etc). 00 is
  * used by symlinks.
  */
-struct file *filp_open(const char * filename, int flags, int mode)
+static struct file *do_filp_open(int dfd, const char *filename, int flags,
+                                 int mode)
 {
         int namei_flags, error;
         struct nameidata nd;
@@ -827,12 +867,17 @@ struct file *filp_open(const char * filename, int flags, int mode)
         if ((namei_flags+1) & O_ACCMODE)
                 namei_flags++;
 
-        error = open_namei(filename, namei_flags, mode, &nd);
+        error = open_namei(dfd, filename, namei_flags, mode, &nd);
         if (!error)
                 return nameidata_to_filp(&nd, flags);
 
         return ERR_PTR(error);
 }
+
+struct file *filp_open(const char *filename, int flags, int mode)
+{
+        return do_filp_open(AT_FDCWD, filename, flags, mode);
+}
 EXPORT_SYMBOL(filp_open);
 
 /**
@@ -970,7 +1015,7 @@ out:
 
 EXPORT_SYMBOL(get_unused_fd);
 
-static inline void __put_unused_fd(struct files_struct *files, unsigned int fd)
+static void __put_unused_fd(struct files_struct *files, unsigned int fd)
 {
         struct fdtable *fdt = files_fdtable(files);
         __FD_CLR(fd, fdt->open_fds);
@@ -989,7 +1034,7 @@ void fastcall put_unused_fd(unsigned int fd)
 EXPORT_SYMBOL(put_unused_fd);
 
 /*
- * Install a file pointer in the fd array.  
+ * Install a file pointer in the fd array.
  *
  * The VFS is full of places where we drop the files lock between
  * setting the open_fds bitmap and installing the file in the file
@@ -1014,7 +1059,7 @@ void fastcall fd_install(unsigned int fd, struct file * file)
 
 EXPORT_SYMBOL(fd_install);
 
-long do_sys_open(const char __user *filename, int flags, int mode)
+long do_sys_open(int dfd, const char __user *filename, int flags, int mode)
 {
         char *tmp = getname(filename);
         int fd = PTR_ERR(tmp);
@@ -1022,7 +1067,7 @@ long do_sys_open(const char __user *filename, int flags, int mode)
         if (!IS_ERR(tmp)) {
                 fd = get_unused_fd();
                 if (fd >= 0) {
-                        struct file *f = filp_open(tmp, flags, mode);
+                        struct file *f = do_filp_open(dfd, tmp, flags, mode);
                         if (IS_ERR(f)) {
                                 put_unused_fd(fd);
                                 fd = PTR_ERR(f);
@@ -1041,10 +1086,20 @@ asmlinkage long sys_open(const char __user *filename, int flags, int mode)
         if (force_o_largefile())
                 flags |= O_LARGEFILE;
 
-        return do_sys_open(filename, flags, mode);
+        return do_sys_open(AT_FDCWD, filename, flags, mode);
 }
 EXPORT_SYMBOL_GPL(sys_open);
 
+asmlinkage long sys_openat(int dfd, const char __user *filename, int flags,
+                           int mode)
+{
+        if (force_o_largefile())
+                flags |= O_LARGEFILE;
+
+        return do_sys_open(dfd, filename, flags, mode);
+}
+EXPORT_SYMBOL_GPL(sys_openat);
+
 #ifndef __alpha__
 
 /*