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139 lines
3.6 KiB
C
139 lines
3.6 KiB
C
#include <linux/compiler.h>
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#include <linux/fs.h>
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#include <linux/linkage.h>
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#include <linux/namei.h>
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#include <linux/sched.h>
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#include <linux/utime.h>
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#include <asm/uaccess.h>
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#include <asm/unistd.h>
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#ifdef __ARCH_WANT_SYS_UTIME
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/*
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* sys_utime() can be implemented in user-level using sys_utimes().
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* Is this for backwards compatibility? If so, why not move it
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* into the appropriate arch directory (for those architectures that
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* need it).
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*/
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/* If times==NULL, set access and modification to current time,
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* must be owner or have write permission.
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* Else, update from *times, must be owner or super user.
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*/
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asmlinkage long sys_utime(char __user * filename, struct utimbuf __user * times)
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{
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int error;
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struct nameidata nd;
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struct inode * inode;
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struct iattr newattrs;
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error = user_path_walk(filename, &nd);
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if (error)
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goto out;
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inode = nd.dentry->d_inode;
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error = -EROFS;
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if (IS_RDONLY(inode))
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goto dput_and_out;
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/* Don't worry, the checks are done in inode_change_ok() */
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newattrs.ia_valid = ATTR_CTIME | ATTR_MTIME | ATTR_ATIME;
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if (times) {
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error = -EPERM;
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if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
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goto dput_and_out;
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error = get_user(newattrs.ia_atime.tv_sec, ×->actime);
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newattrs.ia_atime.tv_nsec = 0;
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if (!error)
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error = get_user(newattrs.ia_mtime.tv_sec, ×->modtime);
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newattrs.ia_mtime.tv_nsec = 0;
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if (error)
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goto dput_and_out;
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newattrs.ia_valid |= ATTR_ATIME_SET | ATTR_MTIME_SET;
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} else {
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error = -EACCES;
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if (IS_IMMUTABLE(inode))
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goto dput_and_out;
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if (current->fsuid != inode->i_uid &&
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(error = vfs_permission(&nd, MAY_WRITE)) != 0)
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goto dput_and_out;
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}
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mutex_lock(&inode->i_mutex);
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error = notify_change(nd.dentry, &newattrs);
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mutex_unlock(&inode->i_mutex);
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dput_and_out:
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path_release(&nd);
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out:
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return error;
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}
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#endif
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/* If times==NULL, set access and modification to current time,
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* must be owner or have write permission.
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* Else, update from *times, must be owner or super user.
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*/
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long do_utimes(int dfd, char __user *filename, struct timeval *times)
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{
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int error;
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struct nameidata nd;
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struct inode * inode;
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struct iattr newattrs;
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error = __user_walk_fd(dfd, filename, LOOKUP_FOLLOW, &nd);
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if (error)
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goto out;
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inode = nd.dentry->d_inode;
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error = -EROFS;
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if (IS_RDONLY(inode))
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goto dput_and_out;
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/* Don't worry, the checks are done in inode_change_ok() */
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newattrs.ia_valid = ATTR_CTIME | ATTR_MTIME | ATTR_ATIME;
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if (times) {
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error = -EPERM;
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if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
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goto dput_and_out;
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newattrs.ia_atime.tv_sec = times[0].tv_sec;
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newattrs.ia_atime.tv_nsec = times[0].tv_usec * 1000;
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newattrs.ia_mtime.tv_sec = times[1].tv_sec;
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newattrs.ia_mtime.tv_nsec = times[1].tv_usec * 1000;
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newattrs.ia_valid |= ATTR_ATIME_SET | ATTR_MTIME_SET;
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} else {
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error = -EACCES;
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if (IS_IMMUTABLE(inode))
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goto dput_and_out;
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if (current->fsuid != inode->i_uid &&
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(error = vfs_permission(&nd, MAY_WRITE)) != 0)
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goto dput_and_out;
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}
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mutex_lock(&inode->i_mutex);
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error = notify_change(nd.dentry, &newattrs);
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mutex_unlock(&inode->i_mutex);
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dput_and_out:
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path_release(&nd);
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out:
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return error;
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}
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asmlinkage long sys_futimesat(int dfd, char __user *filename, struct timeval __user *utimes)
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{
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struct timeval times[2];
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if (utimes && copy_from_user(×, utimes, sizeof(times)))
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return -EFAULT;
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return do_utimes(dfd, filename, utimes ? times : NULL);
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}
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asmlinkage long sys_utimes(char __user *filename, struct timeval __user *utimes)
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{
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return sys_futimesat(AT_FDCWD, filename, utimes);
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}
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