diff options
Diffstat (limited to '')
| -rw-r--r-- | fs/ext2/ioctl.c | 159 |
1 files changed, 159 insertions, 0 deletions
diff --git a/fs/ext2/ioctl.c b/fs/ext2/ioctl.c new file mode 100644 index 0000000000..44e04484e5 --- /dev/null +++ b/fs/ext2/ioctl.c @@ -0,0 +1,159 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * linux/fs/ext2/ioctl.c + * + * Copyright (C) 1993, 1994, 1995 + * Remy Card (card@masi.ibp.fr) + * Laboratoire MASI - Institut Blaise Pascal + * Universite Pierre et Marie Curie (Paris VI) + */ + +#include "ext2.h" +#include <linux/capability.h> +#include <linux/time.h> +#include <linux/sched.h> +#include <linux/compat.h> +#include <linux/mount.h> +#include <asm/current.h> +#include <linux/uaccess.h> +#include <linux/fileattr.h> + +int ext2_fileattr_get(struct dentry *dentry, struct fileattr *fa) +{ + struct ext2_inode_info *ei = EXT2_I(d_inode(dentry)); + + fileattr_fill_flags(fa, ei->i_flags & EXT2_FL_USER_VISIBLE); + + return 0; +} + +int ext2_fileattr_set(struct mnt_idmap *idmap, + struct dentry *dentry, struct fileattr *fa) +{ + struct inode *inode = d_inode(dentry); + struct ext2_inode_info *ei = EXT2_I(inode); + + if (fileattr_has_fsx(fa)) + return -EOPNOTSUPP; + + /* Is it quota file? Do not allow user to mess with it */ + if (IS_NOQUOTA(inode)) + return -EPERM; + + ei->i_flags = (ei->i_flags & ~EXT2_FL_USER_MODIFIABLE) | + (fa->flags & EXT2_FL_USER_MODIFIABLE); + + ext2_set_inode_flags(inode); + inode_set_ctime_current(inode); + mark_inode_dirty(inode); + + return 0; +} + + +long ext2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) +{ + struct inode *inode = file_inode(filp); + struct ext2_inode_info *ei = EXT2_I(inode); + unsigned short rsv_window_size; + int ret; + + ext2_debug ("cmd = %u, arg = %lu\n", cmd, arg); + + switch (cmd) { + case EXT2_IOC_GETVERSION: + return put_user(inode->i_generation, (int __user *) arg); + case EXT2_IOC_SETVERSION: { + __u32 generation; + + if (!inode_owner_or_capable(&nop_mnt_idmap, inode)) + return -EPERM; + ret = mnt_want_write_file(filp); + if (ret) + return ret; + if (get_user(generation, (int __user *) arg)) { + ret = -EFAULT; + goto setversion_out; + } + + inode_lock(inode); + inode_set_ctime_current(inode); + inode->i_generation = generation; + inode_unlock(inode); + + mark_inode_dirty(inode); +setversion_out: + mnt_drop_write_file(filp); + return ret; + } + case EXT2_IOC_GETRSVSZ: + if (test_opt(inode->i_sb, RESERVATION) + && S_ISREG(inode->i_mode) + && ei->i_block_alloc_info) { + rsv_window_size = ei->i_block_alloc_info->rsv_window_node.rsv_goal_size; + return put_user(rsv_window_size, (int __user *)arg); + } + return -ENOTTY; + case EXT2_IOC_SETRSVSZ: { + + if (!test_opt(inode->i_sb, RESERVATION) ||!S_ISREG(inode->i_mode)) + return -ENOTTY; + + if (!inode_owner_or_capable(&nop_mnt_idmap, inode)) + return -EACCES; + + if (get_user(rsv_window_size, (int __user *)arg)) + return -EFAULT; + + ret = mnt_want_write_file(filp); + if (ret) + return ret; + + if (rsv_window_size > EXT2_MAX_RESERVE_BLOCKS) + rsv_window_size = EXT2_MAX_RESERVE_BLOCKS; + + /* + * need to allocate reservation structure for this inode + * before set the window size + */ + /* + * XXX What lock should protect the rsv_goal_size? + * Accessed in ext2_get_block only. ext3 uses i_truncate. + */ + mutex_lock(&ei->truncate_mutex); + if (!ei->i_block_alloc_info) + ext2_init_block_alloc_info(inode); + + if (ei->i_block_alloc_info){ + struct ext2_reserve_window_node *rsv = &ei->i_block_alloc_info->rsv_window_node; + rsv->rsv_goal_size = rsv_window_size; + } else { + ret = -ENOMEM; + } + + mutex_unlock(&ei->truncate_mutex); + mnt_drop_write_file(filp); + return ret; + } + default: + return -ENOTTY; + } +} + +#ifdef CONFIG_COMPAT +long ext2_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) +{ + /* These are just misnamed, they actually get/put from/to user an int */ + switch (cmd) { + case EXT2_IOC32_GETVERSION: + cmd = EXT2_IOC_GETVERSION; + break; + case EXT2_IOC32_SETVERSION: + cmd = EXT2_IOC_SETVERSION; + break; + default: + return -ENOIOCTLCMD; + } + return ext2_ioctl(file, cmd, (unsigned long) compat_ptr(arg)); +} +#endif |