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Diffstat (limited to '')
| -rw-r--r-- | fs/ubifs/ioctl.c | 242 |
1 files changed, 242 insertions, 0 deletions
diff --git a/fs/ubifs/ioctl.c b/fs/ubifs/ioctl.c new file mode 100644 index 000000000..8db380a00 --- /dev/null +++ b/fs/ubifs/ioctl.c @@ -0,0 +1,242 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * This file is part of UBIFS. + * + * Copyright (C) 2006-2008 Nokia Corporation. + * Copyright (C) 2006, 2007 University of Szeged, Hungary + * + * Authors: Zoltan Sogor + * Artem Bityutskiy (Битюцкий Артём) + * Adrian Hunter + */ + +/* This file implements EXT2-compatible extended attribute ioctl() calls */ + +#include <linux/compat.h> +#include <linux/mount.h> +#include "ubifs.h" + +/* Need to be kept consistent with checked flags in ioctl2ubifs() */ +#define UBIFS_SETTABLE_IOCTL_FLAGS \ + (FS_COMPR_FL | FS_SYNC_FL | FS_APPEND_FL | \ + FS_IMMUTABLE_FL | FS_DIRSYNC_FL) + +/* Need to be kept consistent with checked flags in ubifs2ioctl() */ +#define UBIFS_GETTABLE_IOCTL_FLAGS \ + (UBIFS_SETTABLE_IOCTL_FLAGS | FS_ENCRYPT_FL) + +/** + * ubifs_set_inode_flags - set VFS inode flags. + * @inode: VFS inode to set flags for + * + * This function propagates flags from UBIFS inode object to VFS inode object. + */ +void ubifs_set_inode_flags(struct inode *inode) +{ + unsigned int flags = ubifs_inode(inode)->flags; + + inode->i_flags &= ~(S_SYNC | S_APPEND | S_IMMUTABLE | S_DIRSYNC | + S_ENCRYPTED); + if (flags & UBIFS_SYNC_FL) + inode->i_flags |= S_SYNC; + if (flags & UBIFS_APPEND_FL) + inode->i_flags |= S_APPEND; + if (flags & UBIFS_IMMUTABLE_FL) + inode->i_flags |= S_IMMUTABLE; + if (flags & UBIFS_DIRSYNC_FL) + inode->i_flags |= S_DIRSYNC; + if (flags & UBIFS_CRYPT_FL) + inode->i_flags |= S_ENCRYPTED; +} + +/* + * ioctl2ubifs - convert ioctl inode flags to UBIFS inode flags. + * @ioctl_flags: flags to convert + * + * This function converts ioctl flags (@FS_COMPR_FL, etc) to UBIFS inode flags + * (@UBIFS_COMPR_FL, etc). + */ +static int ioctl2ubifs(int ioctl_flags) +{ + int ubifs_flags = 0; + + if (ioctl_flags & FS_COMPR_FL) + ubifs_flags |= UBIFS_COMPR_FL; + if (ioctl_flags & FS_SYNC_FL) + ubifs_flags |= UBIFS_SYNC_FL; + if (ioctl_flags & FS_APPEND_FL) + ubifs_flags |= UBIFS_APPEND_FL; + if (ioctl_flags & FS_IMMUTABLE_FL) + ubifs_flags |= UBIFS_IMMUTABLE_FL; + if (ioctl_flags & FS_DIRSYNC_FL) + ubifs_flags |= UBIFS_DIRSYNC_FL; + + return ubifs_flags; +} + +/* + * ubifs2ioctl - convert UBIFS inode flags to ioctl inode flags. + * @ubifs_flags: flags to convert + * + * This function converts UBIFS inode flags (@UBIFS_COMPR_FL, etc) to ioctl + * flags (@FS_COMPR_FL, etc). + */ +static int ubifs2ioctl(int ubifs_flags) +{ + int ioctl_flags = 0; + + if (ubifs_flags & UBIFS_COMPR_FL) + ioctl_flags |= FS_COMPR_FL; + if (ubifs_flags & UBIFS_SYNC_FL) + ioctl_flags |= FS_SYNC_FL; + if (ubifs_flags & UBIFS_APPEND_FL) + ioctl_flags |= FS_APPEND_FL; + if (ubifs_flags & UBIFS_IMMUTABLE_FL) + ioctl_flags |= FS_IMMUTABLE_FL; + if (ubifs_flags & UBIFS_DIRSYNC_FL) + ioctl_flags |= FS_DIRSYNC_FL; + if (ubifs_flags & UBIFS_CRYPT_FL) + ioctl_flags |= FS_ENCRYPT_FL; + + return ioctl_flags; +} + +static int setflags(struct inode *inode, int flags) +{ + int oldflags, err, release; + struct ubifs_inode *ui = ubifs_inode(inode); + struct ubifs_info *c = inode->i_sb->s_fs_info; + struct ubifs_budget_req req = { .dirtied_ino = 1, + .dirtied_ino_d = ALIGN(ui->data_len, 8) }; + + err = ubifs_budget_space(c, &req); + if (err) + return err; + + mutex_lock(&ui->ui_mutex); + oldflags = ubifs2ioctl(ui->flags); + err = vfs_ioc_setflags_prepare(inode, oldflags, flags); + if (err) + goto out_unlock; + + ui->flags &= ~ioctl2ubifs(UBIFS_SETTABLE_IOCTL_FLAGS); + ui->flags |= ioctl2ubifs(flags); + ubifs_set_inode_flags(inode); + inode->i_ctime = current_time(inode); + release = ui->dirty; + mark_inode_dirty_sync(inode); + mutex_unlock(&ui->ui_mutex); + + if (release) + ubifs_release_budget(c, &req); + if (IS_SYNC(inode)) + err = write_inode_now(inode, 1); + return err; + +out_unlock: + mutex_unlock(&ui->ui_mutex); + ubifs_release_budget(c, &req); + return err; +} + +long ubifs_ioctl(struct file *file, unsigned int cmd, unsigned long arg) +{ + int flags, err; + struct inode *inode = file_inode(file); + + switch (cmd) { + case FS_IOC_GETFLAGS: + flags = ubifs2ioctl(ubifs_inode(inode)->flags); + + dbg_gen("get flags: %#x, i_flags %#x", flags, inode->i_flags); + return put_user(flags, (int __user *) arg); + + case FS_IOC_SETFLAGS: { + if (IS_RDONLY(inode)) + return -EROFS; + + if (!inode_owner_or_capable(inode)) + return -EACCES; + + if (get_user(flags, (int __user *) arg)) + return -EFAULT; + + if (flags & ~UBIFS_GETTABLE_IOCTL_FLAGS) + return -EOPNOTSUPP; + flags &= UBIFS_SETTABLE_IOCTL_FLAGS; + + if (!S_ISDIR(inode->i_mode)) + flags &= ~FS_DIRSYNC_FL; + + /* + * Make sure the file-system is read-write and make sure it + * will not become read-only while we are changing the flags. + */ + err = mnt_want_write_file(file); + if (err) + return err; + dbg_gen("set flags: %#x, i_flags %#x", flags, inode->i_flags); + err = setflags(inode, flags); + mnt_drop_write_file(file); + return err; + } + case FS_IOC_SET_ENCRYPTION_POLICY: { + struct ubifs_info *c = inode->i_sb->s_fs_info; + + err = ubifs_enable_encryption(c); + if (err) + return err; + + return fscrypt_ioctl_set_policy(file, (const void __user *)arg); + } + case FS_IOC_GET_ENCRYPTION_POLICY: + return fscrypt_ioctl_get_policy(file, (void __user *)arg); + + case FS_IOC_GET_ENCRYPTION_POLICY_EX: + return fscrypt_ioctl_get_policy_ex(file, (void __user *)arg); + + case FS_IOC_ADD_ENCRYPTION_KEY: + return fscrypt_ioctl_add_key(file, (void __user *)arg); + + case FS_IOC_REMOVE_ENCRYPTION_KEY: + return fscrypt_ioctl_remove_key(file, (void __user *)arg); + + case FS_IOC_REMOVE_ENCRYPTION_KEY_ALL_USERS: + return fscrypt_ioctl_remove_key_all_users(file, + (void __user *)arg); + case FS_IOC_GET_ENCRYPTION_KEY_STATUS: + return fscrypt_ioctl_get_key_status(file, (void __user *)arg); + + case FS_IOC_GET_ENCRYPTION_NONCE: + return fscrypt_ioctl_get_nonce(file, (void __user *)arg); + + default: + return -ENOTTY; + } +} + +#ifdef CONFIG_COMPAT +long ubifs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) +{ + switch (cmd) { + case FS_IOC32_GETFLAGS: + cmd = FS_IOC_GETFLAGS; + break; + case FS_IOC32_SETFLAGS: + cmd = FS_IOC_SETFLAGS; + break; + case FS_IOC_SET_ENCRYPTION_POLICY: + case FS_IOC_GET_ENCRYPTION_POLICY: + case FS_IOC_GET_ENCRYPTION_POLICY_EX: + case FS_IOC_ADD_ENCRYPTION_KEY: + case FS_IOC_REMOVE_ENCRYPTION_KEY: + case FS_IOC_REMOVE_ENCRYPTION_KEY_ALL_USERS: + case FS_IOC_GET_ENCRYPTION_KEY_STATUS: + case FS_IOC_GET_ENCRYPTION_NONCE: + break; + default: + return -ENOIOCTLCMD; + } + return ubifs_ioctl(file, cmd, (unsigned long)compat_ptr(arg)); +} +#endif |