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* fs/open.c is getting bit crowdy * preparation to lutimes(2) Signed-off-by: Alexey Dobriyan <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
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Alexey Dobriyan
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Linus Torvalds
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Oct 1, 2006
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Original file line number | Diff line number | Diff line change |
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#include <linux/compiler.h> | ||
#include <linux/fs.h> | ||
#include <linux/linkage.h> | ||
#include <linux/namei.h> | ||
#include <linux/utime.h> | ||
#include <asm/uaccess.h> | ||
#include <asm/unistd.h> | ||
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#ifdef __ARCH_WANT_SYS_UTIME | ||
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/* | ||
* sys_utime() can be implemented in user-level using sys_utimes(). | ||
* Is this for backwards compatibility? If so, why not move it | ||
* into the appropriate arch directory (for those architectures that | ||
* need it). | ||
*/ | ||
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/* If times==NULL, set access and modification to current time, | ||
* must be owner or have write permission. | ||
* Else, update from *times, must be owner or super user. | ||
*/ | ||
asmlinkage long sys_utime(char __user * filename, struct utimbuf __user * times) | ||
{ | ||
int error; | ||
struct nameidata nd; | ||
struct inode * inode; | ||
struct iattr newattrs; | ||
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error = user_path_walk(filename, &nd); | ||
if (error) | ||
goto out; | ||
inode = nd.dentry->d_inode; | ||
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error = -EROFS; | ||
if (IS_RDONLY(inode)) | ||
goto dput_and_out; | ||
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/* Don't worry, the checks are done in inode_change_ok() */ | ||
newattrs.ia_valid = ATTR_CTIME | ATTR_MTIME | ATTR_ATIME; | ||
if (times) { | ||
error = -EPERM; | ||
if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) | ||
goto dput_and_out; | ||
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error = get_user(newattrs.ia_atime.tv_sec, ×->actime); | ||
newattrs.ia_atime.tv_nsec = 0; | ||
if (!error) | ||
error = get_user(newattrs.ia_mtime.tv_sec, ×->modtime); | ||
newattrs.ia_mtime.tv_nsec = 0; | ||
if (error) | ||
goto dput_and_out; | ||
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newattrs.ia_valid |= ATTR_ATIME_SET | ATTR_MTIME_SET; | ||
} else { | ||
error = -EACCES; | ||
if (IS_IMMUTABLE(inode)) | ||
goto dput_and_out; | ||
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if (current->fsuid != inode->i_uid && | ||
(error = vfs_permission(&nd, MAY_WRITE)) != 0) | ||
goto dput_and_out; | ||
} | ||
mutex_lock(&inode->i_mutex); | ||
error = notify_change(nd.dentry, &newattrs); | ||
mutex_unlock(&inode->i_mutex); | ||
dput_and_out: | ||
path_release(&nd); | ||
out: | ||
return error; | ||
} | ||
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#endif | ||
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/* If times==NULL, set access and modification to current time, | ||
* must be owner or have write permission. | ||
* Else, update from *times, must be owner or super user. | ||
*/ | ||
long do_utimes(int dfd, char __user *filename, struct timeval *times) | ||
{ | ||
int error; | ||
struct nameidata nd; | ||
struct inode * inode; | ||
struct iattr newattrs; | ||
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error = __user_walk_fd(dfd, filename, LOOKUP_FOLLOW, &nd); | ||
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if (error) | ||
goto out; | ||
inode = nd.dentry->d_inode; | ||
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error = -EROFS; | ||
if (IS_RDONLY(inode)) | ||
goto dput_and_out; | ||
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/* Don't worry, the checks are done in inode_change_ok() */ | ||
newattrs.ia_valid = ATTR_CTIME | ATTR_MTIME | ATTR_ATIME; | ||
if (times) { | ||
error = -EPERM; | ||
if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) | ||
goto dput_and_out; | ||
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newattrs.ia_atime.tv_sec = times[0].tv_sec; | ||
newattrs.ia_atime.tv_nsec = times[0].tv_usec * 1000; | ||
newattrs.ia_mtime.tv_sec = times[1].tv_sec; | ||
newattrs.ia_mtime.tv_nsec = times[1].tv_usec * 1000; | ||
newattrs.ia_valid |= ATTR_ATIME_SET | ATTR_MTIME_SET; | ||
} else { | ||
error = -EACCES; | ||
if (IS_IMMUTABLE(inode)) | ||
goto dput_and_out; | ||
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if (current->fsuid != inode->i_uid && | ||
(error = vfs_permission(&nd, MAY_WRITE)) != 0) | ||
goto dput_and_out; | ||
} | ||
mutex_lock(&inode->i_mutex); | ||
error = notify_change(nd.dentry, &newattrs); | ||
mutex_unlock(&inode->i_mutex); | ||
dput_and_out: | ||
path_release(&nd); | ||
out: | ||
return error; | ||
} | ||
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asmlinkage long sys_futimesat(int dfd, char __user *filename, struct timeval __user *utimes) | ||
{ | ||
struct timeval times[2]; | ||
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if (utimes && copy_from_user(×, utimes, sizeof(times))) | ||
return -EFAULT; | ||
return do_utimes(dfd, filename, utimes ? times : NULL); | ||
} | ||
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asmlinkage long sys_utimes(char __user *filename, struct timeval __user *utimes) | ||
{ | ||
return sys_futimesat(AT_FDCWD, filename, utimes); | ||
} |
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