/* * 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 #include #include #include #include #include #include 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 int flags; unsigned short rsv_window_size; int ret; ext2_debug ("cmd = %u, arg = %lu\n", cmd, arg); switch (cmd) { case EXT2_IOC_GETFLAGS: ext2_get_inode_flags(ei); flags = ei->i_flags & EXT2_FL_USER_VISIBLE; return put_user(flags, (int __user *) arg); case EXT2_IOC_SETFLAGS: { unsigned int oldflags; ret = mnt_want_write_file(filp); if (ret) return ret; if (!inode_owner_or_capable(inode)) { ret = -EACCES; goto setflags_out; } if (get_user(flags, (int __user *) arg)) { ret = -EFAULT; goto setflags_out; } flags = ext2_mask_flags(inode->i_mode, flags); inode_lock(inode); /* Is it quota file? Do not allow user to mess with it */ if (IS_NOQUOTA(inode)) { inode_unlock(inode); ret = -EPERM; goto setflags_out; } oldflags = ei->i_flags; /* * The IMMUTABLE and APPEND_ONLY flags can only be changed by * the relevant capability. * * This test looks nicer. Thanks to Pauline Middelink */ if ((flags ^ oldflags) & (EXT2_APPEND_FL | EXT2_IMMUTABLE_FL)) { if (!capable(CAP_LINUX_IMMUTABLE)) { inode_unlock(inode); ret = -EPERM; goto setflags_out; } } flags = flags & EXT2_FL_USER_MODIFIABLE; flags |= oldflags & ~EXT2_FL_USER_MODIFIABLE; ei->i_flags = flags; ext2_set_inode_flags(inode); inode->i_ctime = current_time(inode); inode_unlock(inode); mark_inode_dirty(inode); setflags_out: mnt_drop_write_file(filp); return ret; } case EXT2_IOC_GETVERSION: return put_user(inode->i_generation, (int __user *) arg); case EXT2_IOC_SETVERSION: { __u32 generation; if (!inode_owner_or_capable(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->i_ctime = current_time(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(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; } mutex_unlock(&ei->truncate_mutex); mnt_drop_write_file(filp); return 0; } 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_GETFLAGS: cmd = EXT2_IOC_GETFLAGS; break; case EXT2_IOC32_SETFLAGS: cmd = EXT2_IOC_SETFLAGS; break; 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 ass='ctrl'>
authorThomas Gleixner <tglx@linutronix.de>2017-01-10 14:01:05 +0100
committerThomas Gleixner <tglx@linutronix.de>2017-01-16 13:20:05 +0100
commit4205e4786d0b9fc3b4fec7b1910cf645a0468307 (patch)
tree685ccb486409197b936c785eb9d173c3edff45a1 /include/asm-generic
parent7e164ce4e8ecd7e9a58a83750bd3ee03125df154 (diff)
cpu/hotplug: Provide dynamic range for prepare stage
Mathieu reported that the LTTNG modules are broken as of 4.10-rc1 due to the removal of the cpu hotplug notifiers. Usually I don't care much about out of tree modules, but LTTNG is widely used in distros. There are two ways to solve that: 1) Reserve a hotplug state for LTTNG 2) Add a dynamic range for the prepare states. While #1 is the simplest solution, #2 is the proper one as we can convert in tree users, which do not care about ordering, to the dynamic range as well. Add a dynamic range which allows LTTNG to request states in the prepare stage. Reported-and-tested-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Sebastian Sewior <bigeasy@linutronix.de> Cc: Steven Rostedt <rostedt@goodmis.org> Link: http://lkml.kernel.org/r/alpine.DEB.2.20.1701101353010.3401@nanos Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'include/asm-generic')