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![Dave Hansen](/assets/img/avatar_default.png)
Some ioctl()s can cause writes to the filesystem. Take these, and make them use mnt_want/drop_write() instead. [AV: updated] Acked-by: Al Viro <viro@ZenIV.linux.org.uk> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Dave Hansen <haveblue@us.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
198 lines
5 KiB
C
198 lines
5 KiB
C
/*
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* linux/fs/hfsplus/ioctl.c
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*
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* Copyright (C) 2003
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* Ethan Benson <erbenson@alaska.net>
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* partially derived from linux/fs/ext2/ioctl.c
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* Copyright (C) 1993, 1994, 1995
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* Remy Card (card@masi.ibp.fr)
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* Laboratoire MASI - Institut Blaise Pascal
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* Universite Pierre et Marie Curie (Paris VI)
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*
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* hfsplus ioctls
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*/
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#include <linux/capability.h>
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#include <linux/fs.h>
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#include <linux/mount.h>
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#include <linux/sched.h>
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#include <linux/xattr.h>
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#include <asm/uaccess.h>
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#include "hfsplus_fs.h"
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int hfsplus_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
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unsigned long arg)
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{
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unsigned int flags;
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switch (cmd) {
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case HFSPLUS_IOC_EXT2_GETFLAGS:
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flags = 0;
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if (HFSPLUS_I(inode).rootflags & HFSPLUS_FLG_IMMUTABLE)
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flags |= FS_IMMUTABLE_FL; /* EXT2_IMMUTABLE_FL */
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if (HFSPLUS_I(inode).rootflags & HFSPLUS_FLG_APPEND)
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flags |= FS_APPEND_FL; /* EXT2_APPEND_FL */
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if (HFSPLUS_I(inode).userflags & HFSPLUS_FLG_NODUMP)
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flags |= FS_NODUMP_FL; /* EXT2_NODUMP_FL */
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return put_user(flags, (int __user *)arg);
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case HFSPLUS_IOC_EXT2_SETFLAGS: {
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int err = 0;
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err = mnt_want_write(filp->f_path.mnt);
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if (err)
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return err;
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if (!is_owner_or_cap(inode)) {
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err = -EACCES;
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goto setflags_out;
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}
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if (get_user(flags, (int __user *)arg)) {
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err = -EFAULT;
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goto setflags_out;
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}
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if (flags & (FS_IMMUTABLE_FL|FS_APPEND_FL) ||
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HFSPLUS_I(inode).rootflags & (HFSPLUS_FLG_IMMUTABLE|HFSPLUS_FLG_APPEND)) {
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if (!capable(CAP_LINUX_IMMUTABLE)) {
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err = -EPERM;
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goto setflags_out;
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}
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}
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/* don't silently ignore unsupported ext2 flags */
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if (flags & ~(FS_IMMUTABLE_FL|FS_APPEND_FL|FS_NODUMP_FL)) {
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err = -EOPNOTSUPP;
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goto setflags_out;
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}
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if (flags & FS_IMMUTABLE_FL) { /* EXT2_IMMUTABLE_FL */
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inode->i_flags |= S_IMMUTABLE;
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HFSPLUS_I(inode).rootflags |= HFSPLUS_FLG_IMMUTABLE;
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} else {
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inode->i_flags &= ~S_IMMUTABLE;
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HFSPLUS_I(inode).rootflags &= ~HFSPLUS_FLG_IMMUTABLE;
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}
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if (flags & FS_APPEND_FL) { /* EXT2_APPEND_FL */
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inode->i_flags |= S_APPEND;
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HFSPLUS_I(inode).rootflags |= HFSPLUS_FLG_APPEND;
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} else {
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inode->i_flags &= ~S_APPEND;
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HFSPLUS_I(inode).rootflags &= ~HFSPLUS_FLG_APPEND;
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}
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if (flags & FS_NODUMP_FL) /* EXT2_NODUMP_FL */
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HFSPLUS_I(inode).userflags |= HFSPLUS_FLG_NODUMP;
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else
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HFSPLUS_I(inode).userflags &= ~HFSPLUS_FLG_NODUMP;
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inode->i_ctime = CURRENT_TIME_SEC;
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mark_inode_dirty(inode);
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setflags_out:
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mnt_drop_write(filp->f_path.mnt);
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return err;
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}
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default:
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return -ENOTTY;
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}
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}
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int hfsplus_setxattr(struct dentry *dentry, const char *name,
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const void *value, size_t size, int flags)
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{
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struct inode *inode = dentry->d_inode;
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struct hfs_find_data fd;
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hfsplus_cat_entry entry;
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struct hfsplus_cat_file *file;
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int res;
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if (!S_ISREG(inode->i_mode) || HFSPLUS_IS_RSRC(inode))
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return -EOPNOTSUPP;
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res = hfs_find_init(HFSPLUS_SB(inode->i_sb).cat_tree, &fd);
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if (res)
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return res;
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res = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd);
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if (res)
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goto out;
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hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
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sizeof(struct hfsplus_cat_file));
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file = &entry.file;
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if (!strcmp(name, "hfs.type")) {
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if (size == 4)
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memcpy(&file->user_info.fdType, value, 4);
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else
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res = -ERANGE;
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} else if (!strcmp(name, "hfs.creator")) {
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if (size == 4)
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memcpy(&file->user_info.fdCreator, value, 4);
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else
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res = -ERANGE;
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} else
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res = -EOPNOTSUPP;
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if (!res)
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hfs_bnode_write(fd.bnode, &entry, fd.entryoffset,
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sizeof(struct hfsplus_cat_file));
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out:
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hfs_find_exit(&fd);
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return res;
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}
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ssize_t hfsplus_getxattr(struct dentry *dentry, const char *name,
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void *value, size_t size)
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{
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struct inode *inode = dentry->d_inode;
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struct hfs_find_data fd;
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hfsplus_cat_entry entry;
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struct hfsplus_cat_file *file;
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ssize_t res = 0;
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if (!S_ISREG(inode->i_mode) || HFSPLUS_IS_RSRC(inode))
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return -EOPNOTSUPP;
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if (size) {
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res = hfs_find_init(HFSPLUS_SB(inode->i_sb).cat_tree, &fd);
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if (res)
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return res;
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res = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd);
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if (res)
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goto out;
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hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
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sizeof(struct hfsplus_cat_file));
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}
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file = &entry.file;
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if (!strcmp(name, "hfs.type")) {
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if (size >= 4) {
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memcpy(value, &file->user_info.fdType, 4);
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res = 4;
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} else
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res = size ? -ERANGE : 4;
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} else if (!strcmp(name, "hfs.creator")) {
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if (size >= 4) {
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memcpy(value, &file->user_info.fdCreator, 4);
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res = 4;
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} else
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res = size ? -ERANGE : 4;
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} else
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res = -ENODATA;
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out:
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if (size)
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hfs_find_exit(&fd);
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return res;
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}
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#define HFSPLUS_ATTRLIST_SIZE (sizeof("hfs.creator")+sizeof("hfs.type"))
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ssize_t hfsplus_listxattr(struct dentry *dentry, char *buffer, size_t size)
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{
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struct inode *inode = dentry->d_inode;
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if (!S_ISREG(inode->i_mode) || HFSPLUS_IS_RSRC(inode))
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return -EOPNOTSUPP;
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if (!buffer || !size)
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return HFSPLUS_ATTRLIST_SIZE;
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if (size < HFSPLUS_ATTRLIST_SIZE)
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return -ERANGE;
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strcpy(buffer, "hfs.type");
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strcpy(buffer + sizeof("hfs.type"), "hfs.creator");
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return HFSPLUS_ATTRLIST_SIZE;
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}
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