#include <linux/string.h>
#include <linux/mm.h>
-#include <linux/utime.h>
#include <linux/file.h>
-#include <linux/smp_lock.h>
#include <linux/quotaops.h>
#include <linux/fsnotify.h>
#include <linux/module.h>
#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>
#include <linux/pagemap.h>
#include <linux/syscalls.h>
+#include <linux/rcupdate.h>
+#include <linux/audit.h>
+#include <linux/falloc.h>
-#include <asm/unistd.h>
-
-int vfs_statfs(struct super_block *sb, struct kstatfs *buf)
+int vfs_statfs(struct dentry *dentry, struct kstatfs *buf)
{
int retval = -ENODEV;
- if (sb) {
+ if (dentry) {
retval = -ENOSYS;
- if (sb->s_op->statfs) {
+ if (dentry->d_sb->s_op->statfs) {
memset(buf, 0, sizeof(*buf));
- retval = security_sb_statfs(sb);
+ retval = security_sb_statfs(dentry);
if (retval)
return retval;
- retval = sb->s_op->statfs(sb, buf);
+ retval = dentry->d_sb->s_op->statfs(dentry, buf);
if (retval == 0 && buf->f_frsize == 0)
buf->f_frsize = buf->f_bsize;
}
EXPORT_SYMBOL(vfs_statfs);
-static int vfs_statfs_native(struct super_block *sb, struct statfs *buf)
+static int vfs_statfs_native(struct dentry *dentry, struct statfs *buf)
{
struct kstatfs st;
int retval;
- retval = vfs_statfs(sb, &st);
+ retval = vfs_statfs(dentry, &st);
if (retval)
return retval;
return 0;
}
-static int vfs_statfs64(struct super_block *sb, struct statfs64 *buf)
+static int vfs_statfs64(struct dentry *dentry, struct statfs64 *buf)
{
struct kstatfs st;
int retval;
- retval = vfs_statfs(sb, &st);
+ retval = vfs_statfs(dentry, &st);
if (retval)
return retval;
error = user_path_walk(path, &nd);
if (!error) {
struct statfs tmp;
- error = vfs_statfs_native(nd.dentry->d_inode->i_sb, &tmp);
+ error = vfs_statfs_native(nd.path.dentry, &tmp);
if (!error && copy_to_user(buf, &tmp, sizeof(tmp)))
error = -EFAULT;
- path_release(&nd);
+ path_put(&nd.path);
}
return error;
}
error = user_path_walk(path, &nd);
if (!error) {
struct statfs64 tmp;
- error = vfs_statfs64(nd.dentry->d_inode->i_sb, &tmp);
+ error = vfs_statfs64(nd.path.dentry, &tmp);
if (!error && copy_to_user(buf, &tmp, sizeof(tmp)))
error = -EFAULT;
- path_release(&nd);
+ path_put(&nd.path);
}
return error;
}
file = fget(fd);
if (!file)
goto out;
- error = vfs_statfs_native(file->f_dentry->d_inode->i_sb, &tmp);
+ error = vfs_statfs_native(file->f_path.dentry, &tmp);
if (!error && copy_to_user(buf, &tmp, sizeof(tmp)))
error = -EFAULT;
fput(file);
file = fget(fd);
if (!file)
goto out;
- error = vfs_statfs64(file->f_dentry->d_inode->i_sb, &tmp);
+ error = vfs_statfs64(file->f_path.dentry, &tmp);
if (!error && copy_to_user(buf, &tmp, sizeof(tmp)))
error = -EFAULT;
fput(file);
return error;
}
-int do_truncate(struct dentry *dentry, loff_t length)
+int do_truncate(struct dentry *dentry, loff_t length, unsigned int time_attrs,
+ struct file *filp)
{
int err;
struct iattr newattrs;
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);
+ /* Remove suid/sgid on truncate too */
+ newattrs.ia_valid |= should_remove_suid(dentry);
+
+ 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;
error = user_path_walk(path, &nd);
if (error)
goto out;
- inode = nd.dentry->d_inode;
+ inode = nd.path.dentry->d_inode;
/* For directories it's -EISDIR, for other non-regulars - -EINVAL */
error = -EISDIR;
if (!S_ISREG(inode->i_mode))
goto dput_and_out;
- error = permission(inode,MAY_WRITE,&nd);
+ error = mnt_want_write(nd.path.mnt);
if (error)
goto dput_and_out;
- error = -EROFS;
- if (IS_RDONLY(inode))
- goto dput_and_out;
+ error = vfs_permission(&nd, MAY_WRITE);
+ if (error)
+ goto mnt_drop_write_and_out;
error = -EPERM;
if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
- goto dput_and_out;
+ goto mnt_drop_write_and_out;
+
+ error = get_write_access(inode);
+ if (error)
+ goto mnt_drop_write_and_out;
/*
- * Make sure that there are no leases.
+ * Make sure that there are no leases. get_write_access() protects
+ * against the truncate racing with a lease-granting setlease().
*/
error = break_lease(inode, FMODE_WRITE);
if (error)
- goto dput_and_out;
-
- error = get_write_access(inode);
- if (error)
- goto dput_and_out;
+ goto put_write_and_out;
error = locks_verify_truncate(inode, NULL, length);
if (!error) {
DQUOT_INIT(inode);
- error = do_truncate(nd.dentry, length);
+ error = do_truncate(nd.path.dentry, length, 0, NULL);
}
- put_write_access(inode);
+put_write_and_out:
+ put_write_access(inode);
+mnt_drop_write_and_out:
+ mnt_drop_write(nd.path.mnt);
dput_and_out:
- path_release(&nd);
+ path_put(&nd.path);
out:
return error;
}
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;
if (file->f_flags & O_LARGEFILE)
small = 0;
- dentry = file->f_dentry;
+ dentry = file->f_path.dentry;
inode = dentry->d_inode;
error = -EINVAL;
if (!S_ISREG(inode->i_mode) || !(file->f_mode & FMODE_WRITE))
error = locks_verify_truncate(inode, file, length);
if (!error)
- error = do_truncate(dentry, length);
+ error = do_truncate(dentry, length, ATTR_MTIME|ATTR_CTIME, file);
out_putf:
fput(file);
out:
asmlinkage long sys_ftruncate(unsigned int fd, unsigned long length)
{
- return do_sys_ftruncate(fd, length, 1);
+ long ret = do_sys_ftruncate(fd, length, 1);
+ /* avoid REGPARM breakage on x86: */
+ asmlinkage_protect(2, ret, fd, length);
+ return ret;
}
/* LFS versions of truncate are only needed on 32 bit machines */
asmlinkage long sys_ftruncate64(unsigned int fd, loff_t length)
{
- return do_sys_ftruncate(fd, length, 0);
+ long ret = do_sys_ftruncate(fd, length, 0);
+ /* avoid REGPARM breakage on x86: */
+ asmlinkage_protect(2, ret, fd, length);
+ return ret;
}
#endif
-#ifdef __ARCH_WANT_SYS_UTIME
-
-/*
- * 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).
- */
-
-/* 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)
+asmlinkage long sys_fallocate(int fd, int mode, loff_t offset, loff_t len)
{
- int error;
- struct nameidata nd;
- struct inode * inode;
- struct iattr newattrs;
+ struct file *file;
+ struct inode *inode;
+ long ret = -EINVAL;
- error = user_path_walk(filename, &nd);
- if (error)
+ if (offset < 0 || len <= 0)
goto out;
- inode = nd.dentry->d_inode;
-
- error = -EROFS;
- if (IS_RDONLY(inode))
- goto dput_and_out;
-
- /* 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;
-
- 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;
- newattrs.ia_valid |= ATTR_ATIME_SET | ATTR_MTIME_SET;
- } else {
- error = -EACCES;
- if (IS_IMMUTABLE(inode))
- goto dput_and_out;
+ /* Return error if mode is not supported */
+ ret = -EOPNOTSUPP;
+ if (mode && !(mode & FALLOC_FL_KEEP_SIZE))
+ goto out;
- if (current->fsuid != inode->i_uid &&
- (error = permission(inode,MAY_WRITE,&nd)) != 0)
- goto dput_and_out;
- }
- down(&inode->i_sem);
- error = notify_change(nd.dentry, &newattrs);
- up(&inode->i_sem);
-dput_and_out:
- path_release(&nd);
-out:
- return error;
-}
+ ret = -EBADF;
+ file = fget(fd);
+ if (!file)
+ goto out;
+ if (!(file->f_mode & FMODE_WRITE))
+ goto out_fput;
+ /*
+ * Revalidate the write permissions, in case security policy has
+ * changed since the files were opened.
+ */
+ ret = security_file_permission(file, MAY_WRITE);
+ if (ret)
+ goto out_fput;
-#endif
+ inode = file->f_path.dentry->d_inode;
-/* 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(char __user * filename, struct timeval * times)
-{
- int error;
- struct nameidata nd;
- struct inode * inode;
- struct iattr newattrs;
+ ret = -ESPIPE;
+ if (S_ISFIFO(inode->i_mode))
+ goto out_fput;
- error = user_path_walk(filename, &nd);
+ ret = -ENODEV;
+ /*
+ * Let individual file system decide if it supports preallocation
+ * for directories or not.
+ */
+ if (!S_ISREG(inode->i_mode) && !S_ISDIR(inode->i_mode))
+ goto out_fput;
- if (error)
- goto out;
- inode = nd.dentry->d_inode;
+ ret = -EFBIG;
+ /* Check for wrap through zero too */
+ if (((offset + len) > inode->i_sb->s_maxbytes) || ((offset + len) < 0))
+ goto out_fput;
- error = -EROFS;
- if (IS_RDONLY(inode))
- goto dput_and_out;
+ if (inode->i_op && inode->i_op->fallocate)
+ ret = inode->i_op->fallocate(inode, mode, offset, len);
+ else
+ ret = -EOPNOTSUPP;
- /* 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;
-
- 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;
-
- if (current->fsuid != inode->i_uid &&
- (error = permission(inode,MAY_WRITE,&nd)) != 0)
- goto dput_and_out;
- }
- down(&inode->i_sem);
- error = notify_change(nd.dentry, &newattrs);
- up(&inode->i_sem);
-dput_and_out:
- path_release(&nd);
+out_fput:
+ fput(file);
out:
- return error;
-}
-
-asmlinkage long sys_utimes(char __user * filename, struct timeval __user * utimes)
-{
- struct timeval times[2];
-
- if (utimes && copy_from_user(×, utimes, sizeof(times)))
- return -EFAULT;
- return do_utimes(filename, utimes ? times : NULL);
+ return ret;
}
-
/*
* access() needs to use the real uid/gid, not the effective uid/gid.
* 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;
else
current->cap_effective = current->cap_permitted;
- res = __user_walk(filename, LOOKUP_FOLLOW|LOOKUP_ACCESS, &nd);
- if (!res) {
- res = permission(nd.dentry->d_inode, mode, &nd);
- /* SuS v2 requires we report a read only fs too */
- if(!res && (mode & S_IWOTH) && IS_RDONLY(nd.dentry->d_inode)
- && !special_file(nd.dentry->d_inode->i_mode))
- res = -EROFS;
- path_release(&nd);
- }
+ res = __user_walk_fd(dfd, filename, LOOKUP_FOLLOW|LOOKUP_ACCESS, &nd);
+ if (res)
+ goto out;
+ res = vfs_permission(&nd, mode);
+ /* SuS v2 requires we report a read only fs too */
+ if(res || !(mode & S_IWOTH) ||
+ special_file(nd.path.dentry->d_inode->i_mode))
+ goto out_path_release;
+ /*
+ * This is a rare case where using __mnt_is_readonly()
+ * is OK without a mnt_want/drop_write() pair. Since
+ * no actual write to the fs is performed here, we do
+ * not need to telegraph to that to anyone.
+ *
+ * By doing this, we accept that this access is
+ * inherently racy and know that the fs may change
+ * state before we even see this result.
+ */
+ if (__mnt_is_readonly(nd.path.mnt))
+ res = -EROFS;
+
+out_path_release:
+ path_put(&nd.path);
+out:
current->fsuid = old_fsuid;
current->fsgid = old_fsgid;
current->cap_effective = old_cap;
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;
int error;
- error = __user_walk(filename, LOOKUP_FOLLOW|LOOKUP_DIRECTORY, &nd);
+ error = __user_walk(filename,
+ LOOKUP_FOLLOW|LOOKUP_DIRECTORY|LOOKUP_CHDIR, &nd);
if (error)
goto out;
- error = permission(nd.dentry->d_inode,MAY_EXEC,&nd);
+ error = vfs_permission(&nd, MAY_EXEC);
if (error)
goto dput_and_out;
- set_fs_pwd(current->fs, nd.mnt, nd.dentry);
+ set_fs_pwd(current->fs, &nd.path);
dput_and_out:
- path_release(&nd);
+ path_put(&nd.path);
out:
return error;
}
asmlinkage long sys_fchdir(unsigned int fd)
{
struct file *file;
- struct dentry *dentry;
struct inode *inode;
- struct vfsmount *mnt;
int error;
error = -EBADF;
if (!file)
goto out;
- dentry = file->f_dentry;
- mnt = file->f_vfsmnt;
- inode = dentry->d_inode;
+ inode = file->f_path.dentry->d_inode;
error = -ENOTDIR;
if (!S_ISDIR(inode->i_mode))
goto out_putf;
- error = permission(inode, MAY_EXEC, NULL);
+ error = file_permission(file, MAY_EXEC);
if (!error)
- set_fs_pwd(current->fs, mnt, dentry);
+ set_fs_pwd(current->fs, &file->f_path);
out_putf:
fput(file);
out:
if (error)
goto out;
- error = permission(nd.dentry->d_inode,MAY_EXEC,&nd);
+ error = vfs_permission(&nd, MAY_EXEC);
if (error)
goto dput_and_out;
if (!capable(CAP_SYS_CHROOT))
goto dput_and_out;
- set_fs_root(current->fs, nd.mnt, nd.dentry);
+ set_fs_root(current->fs, &nd.path);
set_fs_altroot();
error = 0;
dput_and_out:
- path_release(&nd);
+ path_put(&nd.path);
out:
return error;
}
if (!file)
goto out;
- dentry = file->f_dentry;
+ dentry = file->f_path.dentry;
inode = dentry->d_inode;
- err = -EROFS;
- if (IS_RDONLY(inode))
+ audit_inode(NULL, dentry);
+
+ err = mnt_want_write(file->f_path.mnt);
+ if (err)
goto out_putf;
err = -EPERM;
if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
- goto out_putf;
- down(&inode->i_sem);
+ goto out_drop_write;
+ 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_drop_write:
+ mnt_drop_write(file->f_path.mnt);
out_putf:
fput(file);
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;
+ inode = nd.path.dentry->d_inode;
- error = -EROFS;
- if (IS_RDONLY(inode))
+ error = mnt_want_write(nd.path.mnt);
+ if (error)
goto dput_and_out;
error = -EPERM;
if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
- goto dput_and_out;
+ goto out_drop_write;
- 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);
+ error = notify_change(nd.path.dentry, &newattrs);
+ mutex_unlock(&inode->i_mutex);
+out_drop_write:
+ mnt_drop_write(nd.path.mnt);
dput_and_out:
- path_release(&nd);
+ path_put(&nd.path);
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;
printk(KERN_ERR "chown_common: NULL inode\n");
goto out;
}
- error = -EROFS;
- if (IS_RDONLY(inode))
- goto out;
error = -EPERM;
if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
goto out;
newattrs.ia_gid = group;
}
if (!S_ISDIR(inode->i_mode))
- newattrs.ia_valid |= ATTR_KILL_SUID|ATTR_KILL_SGID;
- down(&inode->i_sem);
+ newattrs.ia_valid |=
+ ATTR_KILL_SUID | ATTR_KILL_SGID | ATTR_KILL_PRIV;
+ mutex_lock(&inode->i_mutex);
error = notify_change(dentry, &newattrs);
- up(&inode->i_sem);
+ mutex_unlock(&inode->i_mutex);
out:
return error;
}
int error;
error = user_path_walk(filename, &nd);
- if (!error) {
- error = chown_common(nd.dentry, user, group);
- path_release(&nd);
- }
+ if (error)
+ goto out;
+ error = mnt_want_write(nd.path.mnt);
+ if (error)
+ goto out_release;
+ error = chown_common(nd.path.dentry, user, group);
+ mnt_drop_write(nd.path.mnt);
+out_release:
+ path_put(&nd.path);
+out:
+ 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)
+ goto out;
+ error = mnt_want_write(nd.path.mnt);
+ if (error)
+ goto out_release;
+ error = chown_common(nd.path.dentry, user, group);
+ mnt_drop_write(nd.path.mnt);
+out_release:
+ path_put(&nd.path);
+out:
return error;
}
int error;
error = user_path_walk_link(filename, &nd);
- if (!error) {
- error = chown_common(nd.dentry, user, group);
- path_release(&nd);
- }
+ if (error)
+ goto out;
+ error = mnt_want_write(nd.path.mnt);
+ if (error)
+ goto out_release;
+ error = chown_common(nd.path.dentry, user, group);
+ mnt_drop_write(nd.path.mnt);
+out_release:
+ path_put(&nd.path);
+out:
return error;
}
{
struct file * file;
int error = -EBADF;
+ struct dentry * dentry;
file = fget(fd);
- if (file) {
- error = chown_common(file->f_dentry, user, group);
- fput(file);
- }
+ if (!file)
+ goto out;
+
+ error = mnt_want_write(file->f_path.mnt);
+ if (error)
+ goto out_fput;
+ dentry = file->f_path.dentry;
+ audit_inode(NULL, dentry);
+ error = chown_common(dentry, user, group);
+ mnt_drop_write(file->f_path.mnt);
+out_fput:
+ fput(file);
+out:
return error;
}
/*
- * Note that while the flag value (low two bits) for sys_open means:
- * 00 - read-only
- * 01 - write-only
- * 10 - read-write
- * 11 - special
- * it is changed into
- * 00 - no permissions needed
- * 01 - read-permission
- * 10 - write-permission
- * 11 - read-write
- * for the internal routines (ie open_namei()/follow_link() etc). 00 is
- * used by symlinks.
+ * You have to be very careful that these write
+ * counts get cleaned up in error cases and
+ * upon __fput(). This should probably never
+ * be called outside of __dentry_open().
*/
-struct file *filp_open(const char * filename, int flags, int mode)
+static inline int __get_file_write_access(struct inode *inode,
+ struct vfsmount *mnt)
{
- int namei_flags, error;
- struct nameidata nd;
-
- namei_flags = flags;
- if ((namei_flags+1) & O_ACCMODE)
- namei_flags++;
- if (namei_flags & O_TRUNC)
- namei_flags |= 2;
-
- error = open_namei(filename, namei_flags, mode, &nd);
- if (!error)
- return dentry_open(nd.dentry, nd.mnt, flags);
-
- return ERR_PTR(error);
+ int error;
+ error = get_write_access(inode);
+ if (error)
+ return error;
+ /*
+ * Do not take mount writer counts on
+ * special files since no writes to
+ * the mount itself will occur.
+ */
+ if (!special_file(inode->i_mode)) {
+ /*
+ * Balanced in __fput()
+ */
+ error = mnt_want_write(mnt);
+ if (error)
+ put_write_access(inode);
+ }
+ return error;
}
-EXPORT_SYMBOL(filp_open);
-
-struct file *dentry_open(struct dentry *dentry, struct vfsmount *mnt, int flags)
+static struct file *__dentry_open(struct dentry *dentry, struct vfsmount *mnt,
+ int flags, struct file *f,
+ int (*open)(struct inode *, struct file *))
{
- struct file * f;
struct inode *inode;
int error;
- error = -ENFILE;
- f = get_empty_filp();
- if (!f)
- goto cleanup_dentry;
f->f_flags = flags;
- f->f_mode = ((flags+1) & O_ACCMODE) | FMODE_LSEEK | FMODE_PREAD | FMODE_PWRITE;
+ f->f_mode = ((flags+1) & O_ACCMODE) | FMODE_LSEEK |
+ FMODE_PREAD | FMODE_PWRITE;
inode = dentry->d_inode;
if (f->f_mode & FMODE_WRITE) {
- error = get_write_access(inode);
+ error = __get_file_write_access(inode, mnt);
if (error)
goto cleanup_file;
+ if (!special_file(inode->i_mode))
+ file_take_write(f);
}
f->f_mapping = inode->i_mapping;
- f->f_dentry = dentry;
- f->f_vfsmnt = mnt;
+ f->f_path.dentry = dentry;
+ f->f_path.mnt = mnt;
f->f_pos = 0;
f->f_op = fops_get(inode->i_fop);
file_move(f, &inode->i_sb->s_files);
- if (f->f_op && f->f_op->open) {
- error = f->f_op->open(inode,f);
+ error = security_dentry_open(f);
+ if (error)
+ goto cleanup_all;
+
+ if (!open && f->f_op)
+ open = f->f_op->open;
+ if (open) {
+ error = open(inode, f);
if (error)
goto cleanup_all;
}
+
f->f_flags &= ~(O_CREAT | O_EXCL | O_NOCTTY | O_TRUNC);
file_ra_state_init(&f->f_ra, f->f_mapping->host->i_mapping);
cleanup_all:
fops_put(f->f_op);
- if (f->f_mode & FMODE_WRITE)
+ if (f->f_mode & FMODE_WRITE) {
put_write_access(inode);
+ if (!special_file(inode->i_mode)) {
+ /*
+ * We don't consider this a real
+ * mnt_want/drop_write() pair
+ * because it all happenend right
+ * here, so just reset the state.
+ */
+ file_reset_write(f);
+ mnt_drop_write(mnt);
+ }
+ }
file_kill(f);
- f->f_dentry = NULL;
- f->f_vfsmnt = NULL;
+ f->f_path.dentry = NULL;
+ f->f_path.mnt = NULL;
cleanup_file:
put_filp(f);
-cleanup_dentry:
dput(dentry);
mntput(mnt);
return ERR_PTR(error);
}
+/**
+ * lookup_instantiate_filp - instantiates the open intent filp
+ * @nd: pointer to nameidata
+ * @dentry: pointer to dentry
+ * @open: open callback
+ *
+ * Helper for filesystems that want to use lookup open intents and pass back
+ * a fully instantiated struct file to the caller.
+ * This function is meant to be called from within a filesystem's
+ * lookup method.
+ * Beware of calling it for non-regular files! Those ->open methods might block
+ * (e.g. in fifo_open), leaving you with parent locked (and in case of fifo,
+ * leading to a deadlock, as nobody can open that fifo anymore, because
+ * another process to open fifo will block on locked parent when doing lookup).
+ * Note that in case of error, nd->intent.open.file is destroyed, but the
+ * path information remains valid.
+ * If the open callback is set to NULL, then the standard f_op->open()
+ * filesystem callback is substituted.
+ */
+struct file *lookup_instantiate_filp(struct nameidata *nd, struct dentry *dentry,
+ int (*open)(struct inode *, struct file *))
+{
+ if (IS_ERR(nd->intent.open.file))
+ goto out;
+ if (IS_ERR(dentry))
+ goto out_err;
+ nd->intent.open.file = __dentry_open(dget(dentry), mntget(nd->path.mnt),
+ nd->intent.open.flags - 1,
+ nd->intent.open.file,
+ open);
+out:
+ return nd->intent.open.file;
+out_err:
+ release_open_intent(nd);
+ nd->intent.open.file = (struct file *)dentry;
+ goto out;
+}
+EXPORT_SYMBOL_GPL(lookup_instantiate_filp);
+
+/**
+ * nameidata_to_filp - convert a nameidata to an open filp.
+ * @nd: pointer to nameidata
+ * @flags: open flags
+ *
+ * Note that this function destroys the original nameidata
+ */
+struct file *nameidata_to_filp(struct nameidata *nd, int flags)
+{
+ struct file *filp;
+
+ /* Pick up the filp from the open intent */
+ filp = nd->intent.open.file;
+ /* Has the filesystem initialised the file for us? */
+ if (filp->f_path.dentry == NULL)
+ filp = __dentry_open(nd->path.dentry, nd->path.mnt, flags, filp,
+ NULL);
+ else
+ path_put(&nd->path);
+ return filp;
+}
+
+/*
+ * dentry_open() will have done dput(dentry) and mntput(mnt) if it returns an
+ * error.
+ */
+struct file *dentry_open(struct dentry *dentry, struct vfsmount *mnt, int flags)
+{
+ int error;
+ struct file *f;
+
+ /*
+ * We must always pass in a valid mount pointer. Historically
+ * callers got away with not passing it, but we must enforce this at
+ * the earliest possible point now to avoid strange problems deep in the
+ * filesystem stack.
+ */
+ if (!mnt) {
+ printk(KERN_WARNING "%s called with NULL vfsmount\n", __func__);
+ dump_stack();
+ return ERR_PTR(-EINVAL);
+ }
+
+ error = -ENFILE;
+ f = get_empty_filp();
+ if (f == NULL) {
+ dput(dentry);
+ mntput(mnt);
+ return ERR_PTR(error);
+ }
+
+ return __dentry_open(dentry, mnt, flags, f, NULL);
+}
EXPORT_SYMBOL(dentry_open);
/*
* Find an empty file descriptor entry, and mark it busy.
*/
-int get_unused_fd(void)
+int get_unused_fd_flags(int flags)
{
struct files_struct * files = current->files;
int fd, error;
+ struct fdtable *fdt;
error = -EMFILE;
spin_lock(&files->file_lock);
repeat:
- fd = find_next_zero_bit(files->open_fds->fds_bits,
- files->max_fdset,
+ fdt = files_fdtable(files);
+ fd = find_next_zero_bit(fdt->open_fds->fds_bits, fdt->max_fds,
files->next_fd);
/*
goto repeat;
}
- FD_SET(fd, files->open_fds);
- FD_CLR(fd, files->close_on_exec);
+ FD_SET(fd, fdt->open_fds);
+ if (flags & O_CLOEXEC)
+ FD_SET(fd, fdt->close_on_exec);
+ else
+ FD_CLR(fd, fdt->close_on_exec);
files->next_fd = fd + 1;
#if 1
/* Sanity check */
- if (files->fd[fd] != NULL) {
+ if (fdt->fd[fd] != NULL) {
printk(KERN_WARNING "get_unused_fd: slot %d not NULL!\n", fd);
- files->fd[fd] = NULL;
+ fdt->fd[fd] = NULL;
}
#endif
error = fd;
return error;
}
+int get_unused_fd(void)
+{
+ return get_unused_fd_flags(0);
+}
+
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)
{
- __FD_CLR(fd, files->open_fds);
+ struct fdtable *fdt = files_fdtable(files);
+ __FD_CLR(fd, fdt->open_fds);
if (fd < files->next_fd)
files->next_fd = fd;
}
-void fastcall put_unused_fd(unsigned int fd)
+void put_unused_fd(unsigned int fd)
{
struct files_struct *files = current->files;
spin_lock(&files->file_lock);
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
* will follow.
*/
-void fastcall fd_install(unsigned int fd, struct file * file)
+void fd_install(unsigned int fd, struct file *file)
{
struct files_struct *files = current->files;
+ struct fdtable *fdt;
spin_lock(&files->file_lock);
- if (unlikely(files->fd[fd] != NULL))
- BUG();
- files->fd[fd] = file;
+ fdt = files_fdtable(files);
+ BUG_ON(fdt->fd[fd] != NULL);
+ rcu_assign_pointer(fdt->fd[fd], file);
spin_unlock(&files->file_lock);
}
EXPORT_SYMBOL(fd_install);
-asmlinkage long 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;
- int fd;
-
- if (force_o_largefile())
- flags |= O_LARGEFILE;
+ char *tmp = getname(filename);
+ int fd = PTR_ERR(tmp);
- tmp = getname(filename);
- fd = PTR_ERR(tmp);
if (!IS_ERR(tmp)) {
- fd = get_unused_fd();
+ fd = get_unused_fd_flags(flags);
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);
} else {
- fsnotify_open(f->f_dentry);
+ fsnotify_open(f->f_path.dentry);
fd_install(fd, f);
}
}
}
return fd;
}
-EXPORT_SYMBOL_GPL(sys_open);
+
+asmlinkage long sys_open(const char __user *filename, int flags, int mode)
+{
+ long ret;
+
+ if (force_o_largefile())
+ flags |= O_LARGEFILE;
+
+ ret = do_sys_open(AT_FDCWD, filename, flags, mode);
+ /* avoid REGPARM breakage on x86: */
+ asmlinkage_protect(3, ret, filename, flags, mode);
+ return ret;
+}
+
+asmlinkage long sys_openat(int dfd, const char __user *filename, int flags,
+ int mode)
+{
+ long ret;
+
+ if (force_o_largefile())
+ flags |= O_LARGEFILE;
+
+ ret = do_sys_open(dfd, filename, flags, mode);
+ /* avoid REGPARM breakage on x86: */
+ asmlinkage_protect(4, ret, dfd, filename, flags, mode);
+ return ret;
+}
#ifndef __alpha__
}
if (filp->f_op && filp->f_op->flush)
- retval = filp->f_op->flush(filp);
+ retval = filp->f_op->flush(filp, id);
dnotify_flush(filp, id);
locks_remove_posix(filp, id);
{
struct file * filp;
struct files_struct *files = current->files;
+ struct fdtable *fdt;
+ int retval;
spin_lock(&files->file_lock);
- if (fd >= files->max_fds)
+ fdt = files_fdtable(files);
+ if (fd >= fdt->max_fds)
goto out_unlock;
- filp = files->fd[fd];
+ filp = fdt->fd[fd];
if (!filp)
goto out_unlock;
- files->fd[fd] = NULL;
- FD_CLR(fd, files->close_on_exec);
+ rcu_assign_pointer(fdt->fd[fd], NULL);
+ FD_CLR(fd, fdt->close_on_exec);
__put_unused_fd(files, fd);
spin_unlock(&files->file_lock);
- return filp_close(filp, files);
+ retval = filp_close(filp, files);
+
+ /* can't restart close syscall because file table entry was cleared */
+ if (unlikely(retval == -ERESTARTSYS ||
+ retval == -ERESTARTNOINTR ||
+ retval == -ERESTARTNOHAND ||
+ retval == -ERESTART_RESTARTBLOCK))
+ retval = -EINTR;
+
+ return retval;
out_unlock:
spin_unlock(&files->file_lock);
asmlinkage long sys_vhangup(void)
{
if (capable(CAP_SYS_TTY_CONFIG)) {
+ /* XXX: this needs locking */
tty_vhangup(current->signal->tty);
return 0;
}
int generic_file_open(struct inode * inode, struct file * filp)
{
if (!(filp->f_flags & O_LARGEFILE) && i_size_read(inode) > MAX_NON_LFS)
- return -EFBIG;
+ return -EOVERFLOW;
return 0;
}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff