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fs/fcntl.c
23 KB
b24413180 License cleanup: ... |
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// SPDX-License-Identifier: GPL-2.0 |
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/* * linux/fs/fcntl.c * * Copyright (C) 1991, 1992 Linus Torvalds */ #include <linux/syscalls.h> #include <linux/init.h> #include <linux/mm.h> |
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#include <linux/sched/task.h> |
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#include <linux/fs.h> #include <linux/file.h> |
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#include <linux/fdtable.h> |
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#include <linux/capability.h> |
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#include <linux/dnotify.h> |
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#include <linux/slab.h> #include <linux/module.h> |
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#include <linux/pipe_fs_i.h> |
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#include <linux/security.h> #include <linux/ptrace.h> |
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#include <linux/signal.h> |
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#include <linux/rcupdate.h> |
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#include <linux/pid_namespace.h> |
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#include <linux/user_namespace.h> |
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#include <linux/shmem_fs.h> |
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#include <linux/compat.h> |
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#include <asm/poll.h> #include <asm/siginfo.h> |
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#include <linux/uaccess.h> |
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|
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#define SETFL_MASK (O_APPEND | O_NONBLOCK | O_NDELAY | O_DIRECT | O_NOATIME) |
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static int setfl(int fd, struct file * filp, unsigned long arg) { |
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struct inode * inode = file_inode(filp); |
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int error = 0; |
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/* * O_APPEND cannot be cleared if the file is marked as append-only * and the file is open for write. */ if (((arg ^ filp->f_flags) & O_APPEND) && IS_APPEND(inode)) |
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return -EPERM; /* O_NOATIME can only be set by the owner or superuser */ if ((arg & O_NOATIME) && !(filp->f_flags & O_NOATIME)) |
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if (!inode_owner_or_capable(inode)) |
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return -EPERM; /* required for strict SunOS emulation */ if (O_NONBLOCK != O_NDELAY) if (arg & O_NDELAY) arg |= O_NONBLOCK; |
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/* Pipe packetized mode is controlled by O_DIRECT flag */ |
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if (!S_ISFIFO(inode->i_mode) && (arg & O_DIRECT)) { |
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if (!filp->f_mapping || !filp->f_mapping->a_ops || !filp->f_mapping->a_ops->direct_IO) return -EINVAL; } |
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if (filp->f_op->check_flags) |
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error = filp->f_op->check_flags(arg); if (error) return error; |
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/* |
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* ->fasync() is responsible for setting the FASYNC bit. |
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*/ |
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if (((arg ^ filp->f_flags) & FASYNC) && filp->f_op->fasync) { |
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error = filp->f_op->fasync(fd, filp, (arg & FASYNC) != 0); if (error < 0) goto out; |
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if (error > 0) error = 0; |
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} |
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spin_lock(&filp->f_lock); |
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filp->f_flags = (arg & SETFL_MASK) | (filp->f_flags & ~SETFL_MASK); |
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spin_unlock(&filp->f_lock); |
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|
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out: |
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return error; } |
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static void f_modown(struct file *filp, struct pid *pid, enum pid_type type, |
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int force) |
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{ |
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write_lock_irq(&filp->f_owner.lock); |
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if (force || !filp->f_owner.pid) { |
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put_pid(filp->f_owner.pid); filp->f_owner.pid = get_pid(pid); filp->f_owner.pid_type = type; |
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if (pid) { const struct cred *cred = current_cred(); filp->f_owner.uid = cred->uid; filp->f_owner.euid = cred->euid; } |
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} |
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write_unlock_irq(&filp->f_owner.lock); |
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} |
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void __f_setown(struct file *filp, struct pid *pid, enum pid_type type, |
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int force) |
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{ |
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security_file_set_fowner(filp); |
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f_modown(filp, pid, type, force); |
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} |
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EXPORT_SYMBOL(__f_setown); |
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|
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int f_setown(struct file *filp, unsigned long arg, int force) |
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{ enum pid_type type; |
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struct pid *pid = NULL; int who = arg, ret = 0; |
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type = PIDTYPE_PID; if (who < 0) { |
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/* avoid overflow below */ if (who == INT_MIN) return -EINVAL; |
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type = PIDTYPE_PGID; who = -who; } |
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|
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rcu_read_lock(); |
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if (who) { pid = find_vpid(who); if (!pid) ret = -ESRCH; } if (!ret) __f_setown(filp, pid, type, force); |
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rcu_read_unlock(); |
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|
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return ret; |
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} |
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EXPORT_SYMBOL(f_setown); void f_delown(struct file *filp) { |
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f_modown(filp, NULL, PIDTYPE_PID, 1); |
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} pid_t f_getown(struct file *filp) { pid_t pid; |
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read_lock(&filp->f_owner.lock); |
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pid = pid_vnr(filp->f_owner.pid); |
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if (filp->f_owner.pid_type == PIDTYPE_PGID) pid = -pid; |
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read_unlock(&filp->f_owner.lock); |
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return pid; |
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} |
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static int f_setown_ex(struct file *filp, unsigned long arg) { |
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struct f_owner_ex __user *owner_p = (void __user *)arg; |
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struct f_owner_ex owner; struct pid *pid; int type; int ret; ret = copy_from_user(&owner, owner_p, sizeof(owner)); if (ret) |
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return -EFAULT; |
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switch (owner.type) { case F_OWNER_TID: type = PIDTYPE_MAX; break; case F_OWNER_PID: type = PIDTYPE_PID; break; |
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case F_OWNER_PGRP: |
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type = PIDTYPE_PGID; break; default: return -EINVAL; } rcu_read_lock(); pid = find_vpid(owner.pid); if (owner.pid && !pid) ret = -ESRCH; else |
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__f_setown(filp, pid, type, 1); |
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rcu_read_unlock(); return ret; } static int f_getown_ex(struct file *filp, unsigned long arg) { |
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struct f_owner_ex __user *owner_p = (void __user *)arg; |
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struct f_owner_ex owner; int ret = 0; read_lock(&filp->f_owner.lock); owner.pid = pid_vnr(filp->f_owner.pid); switch (filp->f_owner.pid_type) { case PIDTYPE_MAX: owner.type = F_OWNER_TID; break; case PIDTYPE_PID: owner.type = F_OWNER_PID; break; case PIDTYPE_PGID: |
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owner.type = F_OWNER_PGRP; |
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break; default: WARN_ON(1); ret = -EINVAL; break; } read_unlock(&filp->f_owner.lock); |
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if (!ret) { |
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ret = copy_to_user(owner_p, &owner, sizeof(owner)); |
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if (ret) ret = -EFAULT; } |
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return ret; } |
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#ifdef CONFIG_CHECKPOINT_RESTORE static int f_getowner_uids(struct file *filp, unsigned long arg) { struct user_namespace *user_ns = current_user_ns(); |
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uid_t __user *dst = (void __user *)arg; |
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uid_t src[2]; int err; read_lock(&filp->f_owner.lock); src[0] = from_kuid(user_ns, filp->f_owner.uid); src[1] = from_kuid(user_ns, filp->f_owner.euid); read_unlock(&filp->f_owner.lock); err = put_user(src[0], &dst[0]); err |= put_user(src[1], &dst[1]); return err; } #else static int f_getowner_uids(struct file *filp, unsigned long arg) { return -EINVAL; } #endif |
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static bool rw_hint_valid(enum rw_hint hint) { switch (hint) { case RWF_WRITE_LIFE_NOT_SET: case RWH_WRITE_LIFE_NONE: case RWH_WRITE_LIFE_SHORT: case RWH_WRITE_LIFE_MEDIUM: case RWH_WRITE_LIFE_LONG: case RWH_WRITE_LIFE_EXTREME: return true; default: return false; } } static long fcntl_rw_hint(struct file *file, unsigned int cmd, unsigned long arg) { struct inode *inode = file_inode(file); u64 *argp = (u64 __user *)arg; enum rw_hint hint; |
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u64 h; |
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switch (cmd) { case F_GET_FILE_RW_HINT: |
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h = file_write_hint(file); if (copy_to_user(argp, &h, sizeof(*argp))) |
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return -EFAULT; return 0; case F_SET_FILE_RW_HINT: |
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if (copy_from_user(&h, argp, sizeof(h))) |
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return -EFAULT; |
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hint = (enum rw_hint) h; |
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if (!rw_hint_valid(hint)) return -EINVAL; spin_lock(&file->f_lock); file->f_write_hint = hint; spin_unlock(&file->f_lock); return 0; case F_GET_RW_HINT: |
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h = inode->i_write_hint; if (copy_to_user(argp, &h, sizeof(*argp))) |
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return -EFAULT; return 0; case F_SET_RW_HINT: |
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if (copy_from_user(&h, argp, sizeof(h))) |
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return -EFAULT; |
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hint = (enum rw_hint) h; |
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if (!rw_hint_valid(hint)) return -EINVAL; inode_lock(inode); inode->i_write_hint = hint; inode_unlock(inode); return 0; default: return -EINVAL; } } |
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static long do_fcntl(int fd, unsigned int cmd, unsigned long arg, struct file *filp) { |
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void __user *argp = (void __user *)arg; struct flock flock; |
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long err = -EINVAL; switch (cmd) { case F_DUPFD: |
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err = f_dupfd(arg, filp, 0); break; |
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case F_DUPFD_CLOEXEC: |
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err = f_dupfd(arg, filp, O_CLOEXEC); |
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break; case F_GETFD: err = get_close_on_exec(fd) ? FD_CLOEXEC : 0; break; case F_SETFD: err = 0; set_close_on_exec(fd, arg & FD_CLOEXEC); break; case F_GETFL: err = filp->f_flags; break; case F_SETFL: err = setfl(fd, filp, arg); break; |
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#if BITS_PER_LONG != 32 /* 32-bit arches must use fcntl64() */ |
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case F_OFD_GETLK: |
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#endif |
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case F_GETLK: |
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if (copy_from_user(&flock, argp, sizeof(flock))) return -EFAULT; err = fcntl_getlk(filp, cmd, &flock); if (!err && copy_to_user(argp, &flock, sizeof(flock))) return -EFAULT; |
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break; |
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#if BITS_PER_LONG != 32 /* 32-bit arches must use fcntl64() */ |
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case F_OFD_SETLK: case F_OFD_SETLKW: |
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#endif /* Fallthrough */ |
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case F_SETLK: case F_SETLKW: |
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if (copy_from_user(&flock, argp, sizeof(flock))) return -EFAULT; err = fcntl_setlk(fd, filp, cmd, &flock); |
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break; case F_GETOWN: /* * XXX If f_owner is a process group, the * negative return value will get converted * into an error. Oops. If we keep the * current syscall conventions, the only way * to fix this will be in libc. */ |
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err = f_getown(filp); |
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force_successful_syscall_return(); break; case F_SETOWN: |
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err = f_setown(filp, arg, 1); |
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break; |
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case F_GETOWN_EX: err = f_getown_ex(filp, arg); break; case F_SETOWN_EX: err = f_setown_ex(filp, arg); break; |
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case F_GETOWNER_UIDS: err = f_getowner_uids(filp, arg); break; |
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case F_GETSIG: err = filp->f_owner.signum; break; case F_SETSIG: /* arg == 0 restores default behaviour. */ |
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if (!valid_signal(arg)) { |
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break; } err = 0; filp->f_owner.signum = arg; break; case F_GETLEASE: err = fcntl_getlease(filp); break; case F_SETLEASE: err = fcntl_setlease(fd, filp, arg); break; case F_NOTIFY: err = fcntl_dirnotify(fd, filp, arg); break; |
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case F_SETPIPE_SZ: case F_GETPIPE_SZ: err = pipe_fcntl(filp, cmd, arg); break; |
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case F_ADD_SEALS: case F_GET_SEALS: err = shmem_fcntl(filp, cmd, arg); break; |
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case F_GET_RW_HINT: case F_SET_RW_HINT: case F_GET_FILE_RW_HINT: case F_SET_FILE_RW_HINT: err = fcntl_rw_hint(filp, cmd, arg); break; |
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default: break; } return err; } |
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static int check_fcntl_cmd(unsigned cmd) { switch (cmd) { case F_DUPFD: case F_DUPFD_CLOEXEC: case F_GETFD: case F_SETFD: case F_GETFL: return 1; } return 0; } |
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SYSCALL_DEFINE3(fcntl, unsigned int, fd, unsigned int, cmd, unsigned long, arg) |
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{ |
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struct fd f = fdget_raw(fd); |
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long err = -EBADF; |
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if (!f.file) |
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goto out; |
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if (unlikely(f.file->f_mode & FMODE_PATH)) { |
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if (!check_fcntl_cmd(cmd)) goto out1; |
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} |
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err = security_file_fcntl(f.file, cmd, arg); |
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if (!err) |
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err = do_fcntl(fd, cmd, arg, f.file); |
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|
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out1: |
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fdput(f); |
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out: return err; } #if BITS_PER_LONG == 32 |
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SYSCALL_DEFINE3(fcntl64, unsigned int, fd, unsigned int, cmd, unsigned long, arg) |
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455 |
{ |
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void __user *argp = (void __user *)arg; |
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struct fd f = fdget_raw(fd); |
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struct flock64 flock; |
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long err = -EBADF; |
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|
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if (!f.file) |
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goto out; |
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if (unlikely(f.file->f_mode & FMODE_PATH)) { |
545ec2c79 switch fcntl to f... |
464 465 |
if (!check_fcntl_cmd(cmd)) goto out1; |
1abf0c718 New kind of open ... |
466 |
} |
2903ff019 switch simple cas... |
467 |
err = security_file_fcntl(f.file, cmd, arg); |
545ec2c79 switch fcntl to f... |
468 469 |
if (err) goto out1; |
1da177e4c Linux-2.6.12-rc2 |
470 471 |
switch (cmd) { |
5d50ffd7c locks: add new fc... |
472 |
case F_GETLK64: |
0d3f7a2dd locks: rename fil... |
473 |
case F_OFD_GETLK: |
a75d30c77 fs/locks: pass ke... |
474 475 476 477 478 479 |
err = -EFAULT; if (copy_from_user(&flock, argp, sizeof(flock))) break; err = fcntl_getlk64(f.file, cmd, &flock); if (!err && copy_to_user(argp, &flock, sizeof(flock))) err = -EFAULT; |
5d50ffd7c locks: add new fc... |
480 481 482 |
break; case F_SETLK64: case F_SETLKW64: |
0d3f7a2dd locks: rename fil... |
483 484 |
case F_OFD_SETLK: case F_OFD_SETLKW: |
a75d30c77 fs/locks: pass ke... |
485 486 487 488 |
err = -EFAULT; if (copy_from_user(&flock, argp, sizeof(flock))) break; err = fcntl_setlk64(fd, f.file, cmd, &flock); |
5d50ffd7c locks: add new fc... |
489 490 491 492 |
break; default: err = do_fcntl(fd, cmd, arg, f.file); break; |
1da177e4c Linux-2.6.12-rc2 |
493 |
} |
545ec2c79 switch fcntl to f... |
494 |
out1: |
2903ff019 switch simple cas... |
495 |
fdput(f); |
1da177e4c Linux-2.6.12-rc2 |
496 497 498 499 |
out: return err; } #endif |
80f0cce6a fcntl: move compa... |
500 |
#ifdef CONFIG_COMPAT |
8c6657cb5 Switch flock copy... |
501 |
/* careful - don't use anywhere else */ |
b59eea554 vfs: fix flock co... |
502 503 504 505 506 507 508 509 |
#define copy_flock_fields(dst, src) \ (dst)->l_type = (src)->l_type; \ (dst)->l_whence = (src)->l_whence; \ (dst)->l_start = (src)->l_start; \ (dst)->l_len = (src)->l_len; \ (dst)->l_pid = (src)->l_pid; static int get_compat_flock(struct flock *kfl, const struct compat_flock __user *ufl) |
80f0cce6a fcntl: move compa... |
510 |
{ |
8c6657cb5 Switch flock copy... |
511 512 513 |
struct compat_flock fl; if (copy_from_user(&fl, ufl, sizeof(struct compat_flock))) |
80f0cce6a fcntl: move compa... |
514 |
return -EFAULT; |
b59eea554 vfs: fix flock co... |
515 |
copy_flock_fields(kfl, &fl); |
80f0cce6a fcntl: move compa... |
516 517 |
return 0; } |
b59eea554 vfs: fix flock co... |
518 |
static int get_compat_flock64(struct flock *kfl, const struct compat_flock64 __user *ufl) |
80f0cce6a fcntl: move compa... |
519 |
{ |
8c6657cb5 Switch flock copy... |
520 521 522 |
struct compat_flock64 fl; if (copy_from_user(&fl, ufl, sizeof(struct compat_flock64))) |
80f0cce6a fcntl: move compa... |
523 |
return -EFAULT; |
b59eea554 vfs: fix flock co... |
524 |
copy_flock_fields(kfl, &fl); |
80f0cce6a fcntl: move compa... |
525 526 |
return 0; } |
b59eea554 vfs: fix flock co... |
527 |
static int put_compat_flock(const struct flock *kfl, struct compat_flock __user *ufl) |
80f0cce6a fcntl: move compa... |
528 |
{ |
8c6657cb5 Switch flock copy... |
529 530 531 |
struct compat_flock fl; memset(&fl, 0, sizeof(struct compat_flock)); |
b59eea554 vfs: fix flock co... |
532 |
copy_flock_fields(&fl, kfl); |
8c6657cb5 Switch flock copy... |
533 |
if (copy_to_user(ufl, &fl, sizeof(struct compat_flock))) |
80f0cce6a fcntl: move compa... |
534 535 536 |
return -EFAULT; return 0; } |
80f0cce6a fcntl: move compa... |
537 |
|
b59eea554 vfs: fix flock co... |
538 |
static int put_compat_flock64(const struct flock *kfl, struct compat_flock64 __user *ufl) |
80f0cce6a fcntl: move compa... |
539 |
{ |
8c6657cb5 Switch flock copy... |
540 |
struct compat_flock64 fl; |
fc2f80219 fcntl: don't cap ... |
541 542 |
BUILD_BUG_ON(sizeof(kfl->l_start) > sizeof(ufl->l_start)); BUILD_BUG_ON(sizeof(kfl->l_len) > sizeof(ufl->l_len)); |
8c6657cb5 Switch flock copy... |
543 |
memset(&fl, 0, sizeof(struct compat_flock64)); |
b59eea554 vfs: fix flock co... |
544 |
copy_flock_fields(&fl, kfl); |
8c6657cb5 Switch flock copy... |
545 |
if (copy_to_user(ufl, &fl, sizeof(struct compat_flock64))) |
80f0cce6a fcntl: move compa... |
546 547 548 |
return -EFAULT; return 0; } |
8c6657cb5 Switch flock copy... |
549 |
#undef copy_flock_fields |
80f0cce6a fcntl: move compa... |
550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 |
static unsigned int convert_fcntl_cmd(unsigned int cmd) { switch (cmd) { case F_GETLK64: return F_GETLK; case F_SETLK64: return F_SETLK; case F_SETLKW64: return F_SETLKW; } return cmd; } |
94073ad77 fs/locks: don't m... |
565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 |
/* * GETLK was successful and we need to return the data, but it needs to fit in * the compat structure. * l_start shouldn't be too big, unless the original start + end is greater than * COMPAT_OFF_T_MAX, in which case the app was asking for trouble, so we return * -EOVERFLOW in that case. l_len could be too big, in which case we just * truncate it, and only allow the app to see that part of the conflicting lock * that might make sense to it anyway */ static int fixup_compat_flock(struct flock *flock) { if (flock->l_start > COMPAT_OFF_T_MAX) return -EOVERFLOW; if (flock->l_len > COMPAT_OFF_T_MAX) flock->l_len = COMPAT_OFF_T_MAX; return 0; } |
80f0cce6a fcntl: move compa... |
582 583 584 |
COMPAT_SYSCALL_DEFINE3(fcntl64, unsigned int, fd, unsigned int, cmd, compat_ulong_t, arg) { |
94073ad77 fs/locks: don't m... |
585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 |
struct fd f = fdget_raw(fd); struct flock flock; long err = -EBADF; if (!f.file) return err; if (unlikely(f.file->f_mode & FMODE_PATH)) { if (!check_fcntl_cmd(cmd)) goto out_put; } err = security_file_fcntl(f.file, cmd, arg); if (err) goto out_put; |
80f0cce6a fcntl: move compa... |
600 601 602 |
switch (cmd) { case F_GETLK: |
94073ad77 fs/locks: don't m... |
603 604 605 606 607 608 609 |
err = get_compat_flock(&flock, compat_ptr(arg)); if (err) break; err = fcntl_getlk(f.file, convert_fcntl_cmd(cmd), &flock); if (err) break; err = fixup_compat_flock(&flock); |
6e9c2a05c fcntl: don't leak... |
610 611 |
if (!err) err = put_compat_flock(&flock, compat_ptr(arg)); |
94073ad77 fs/locks: don't m... |
612 613 614 615 616 617 618 |
break; case F_GETLK64: case F_OFD_GETLK: err = get_compat_flock64(&flock, compat_ptr(arg)); if (err) break; err = fcntl_getlk(f.file, convert_fcntl_cmd(cmd), &flock); |
fc2f80219 fcntl: don't cap ... |
619 620 |
if (!err) err = put_compat_flock64(&flock, compat_ptr(arg)); |
94073ad77 fs/locks: don't m... |
621 |
break; |
80f0cce6a fcntl: move compa... |
622 623 |
case F_SETLK: case F_SETLKW: |
94073ad77 fs/locks: don't m... |
624 625 |
err = get_compat_flock(&flock, compat_ptr(arg)); if (err) |
80f0cce6a fcntl: move compa... |
626 |
break; |
94073ad77 fs/locks: don't m... |
627 |
err = fcntl_setlk(fd, f.file, convert_fcntl_cmd(cmd), &flock); |
80f0cce6a fcntl: move compa... |
628 |
break; |
80f0cce6a fcntl: move compa... |
629 630 |
case F_SETLK64: case F_SETLKW64: |
80f0cce6a fcntl: move compa... |
631 632 |
case F_OFD_SETLK: case F_OFD_SETLKW: |
94073ad77 fs/locks: don't m... |
633 634 |
err = get_compat_flock64(&flock, compat_ptr(arg)); if (err) |
80f0cce6a fcntl: move compa... |
635 |
break; |
94073ad77 fs/locks: don't m... |
636 |
err = fcntl_setlk(fd, f.file, convert_fcntl_cmd(cmd), &flock); |
80f0cce6a fcntl: move compa... |
637 |
break; |
80f0cce6a fcntl: move compa... |
638 |
default: |
94073ad77 fs/locks: don't m... |
639 |
err = do_fcntl(fd, cmd, arg, f.file); |
80f0cce6a fcntl: move compa... |
640 641 |
break; } |
94073ad77 fs/locks: don't m... |
642 643 644 |
out_put: fdput(f); return err; |
80f0cce6a fcntl: move compa... |
645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 |
} COMPAT_SYSCALL_DEFINE3(fcntl, unsigned int, fd, unsigned int, cmd, compat_ulong_t, arg) { switch (cmd) { case F_GETLK64: case F_SETLK64: case F_SETLKW64: case F_OFD_GETLK: case F_OFD_SETLK: case F_OFD_SETLKW: return -EINVAL; } return compat_sys_fcntl64(fd, cmd, arg); } #endif |
1da177e4c Linux-2.6.12-rc2 |
662 |
/* Table to convert sigio signal codes into poll band bitmaps */ |
fa3536cc1 [PATCH] Use __rea... |
663 |
static const long band_table[NSIGPOLL] = { |
1da177e4c Linux-2.6.12-rc2 |
664 665 666 667 668 669 670 671 672 673 674 |
POLLIN | POLLRDNORM, /* POLL_IN */ POLLOUT | POLLWRNORM | POLLWRBAND, /* POLL_OUT */ POLLIN | POLLRDNORM | POLLMSG, /* POLL_MSG */ POLLERR, /* POLL_ERR */ POLLPRI | POLLRDBAND, /* POLL_PRI */ POLLHUP | POLLERR /* POLL_HUP */ }; static inline int sigio_perm(struct task_struct *p, struct fown_struct *fown, int sig) { |
c69e8d9c0 CRED: Use RCU to ... |
675 676 677 678 679 |
const struct cred *cred; int ret; rcu_read_lock(); cred = __task_cred(p); |
8e96e3b7b userns: Use uid_e... |
680 681 682 |
ret = ((uid_eq(fown->euid, GLOBAL_ROOT_UID) || uid_eq(fown->euid, cred->suid) || uid_eq(fown->euid, cred->uid) || uid_eq(fown->uid, cred->suid) || uid_eq(fown->uid, cred->uid)) && |
c69e8d9c0 CRED: Use RCU to ... |
683 684 685 |
!security_file_send_sigiotask(p, fown, sig)); rcu_read_unlock(); return ret; |
1da177e4c Linux-2.6.12-rc2 |
686 687 688 |
} static void send_sigio_to_task(struct task_struct *p, |
8eeee4e2f send_sigio_to_tas... |
689 |
struct fown_struct *fown, |
ba0a6c9f6 fcntl: add F_[SG]... |
690 |
int fd, int reason, int group) |
1da177e4c Linux-2.6.12-rc2 |
691 |
{ |
8eeee4e2f send_sigio_to_tas... |
692 693 694 695 696 697 698 |
/* * F_SETSIG can change ->signum lockless in parallel, make * sure we read it once and use the same value throughout. */ int signum = ACCESS_ONCE(fown->signum); if (!sigio_perm(p, fown, signum)) |
1da177e4c Linux-2.6.12-rc2 |
699 |
return; |
8eeee4e2f send_sigio_to_tas... |
700 |
switch (signum) { |
1da177e4c Linux-2.6.12-rc2 |
701 702 703 704 705 706 707 708 |
siginfo_t si; default: /* Queue a rt signal with the appropriate fd as its value. We use SI_SIGIO as the source, not SI_KERNEL, since kernel signals always get delivered even if we can't queue. Failure to queue in this case _should_ be reported; we fall back to SIGIO in that case. --sct */ |
8eeee4e2f send_sigio_to_tas... |
709 |
si.si_signo = signum; |
1da177e4c Linux-2.6.12-rc2 |
710 711 |
si.si_errno = 0; si.si_code = reason; |
d08477aa9 fcntl: Don't use ... |
712 713 714 715 716 717 718 719 |
/* * Posix definies POLL_IN and friends to be signal * specific si_codes for SIG_POLL. Linux extended * these si_codes to other signals in a way that is * ambiguous if other signals also have signal * specific si_codes. In that case use SI_SIGIO instead * to remove the ambiguity. */ |
54640d238 fcntl: Don't set ... |
720 |
if ((signum != SIGPOLL) && sig_specific_sicodes(signum)) |
d08477aa9 fcntl: Don't use ... |
721 |
si.si_code = SI_SIGIO; |
1da177e4c Linux-2.6.12-rc2 |
722 723 724 |
/* Make sure we are called with one of the POLL_* reasons, otherwise we could leak kernel stack into userspace. */ |
d08477aa9 fcntl: Don't use ... |
725 |
BUG_ON((reason < POLL_IN) || ((reason - POLL_IN) >= NSIGPOLL)); |
1da177e4c Linux-2.6.12-rc2 |
726 727 728 729 730 |
if (reason - POLL_IN >= NSIGPOLL) si.si_band = ~0L; else si.si_band = band_table[reason - POLL_IN]; si.si_fd = fd; |
ba0a6c9f6 fcntl: add F_[SG]... |
731 |
if (!do_send_sig_info(signum, &si, p, group)) |
1da177e4c Linux-2.6.12-rc2 |
732 733 734 |
break; /* fall-through: fall back on the old plain SIGIO signal */ case 0: |
ba0a6c9f6 fcntl: add F_[SG]... |
735 |
do_send_sig_info(SIGIO, SEND_SIG_PRIV, p, group); |
1da177e4c Linux-2.6.12-rc2 |
736 737 738 739 740 741 |
} } void send_sigio(struct fown_struct *fown, int fd, int band) { struct task_struct *p; |
609d7fa95 [PATCH] file: mod... |
742 743 |
enum pid_type type; struct pid *pid; |
ba0a6c9f6 fcntl: add F_[SG]... |
744 |
int group = 1; |
1da177e4c Linux-2.6.12-rc2 |
745 746 |
read_lock(&fown->lock); |
ba0a6c9f6 fcntl: add F_[SG]... |
747 |
|
609d7fa95 [PATCH] file: mod... |
748 |
type = fown->pid_type; |
ba0a6c9f6 fcntl: add F_[SG]... |
749 750 751 752 |
if (type == PIDTYPE_MAX) { group = 0; type = PIDTYPE_PID; } |
1da177e4c Linux-2.6.12-rc2 |
753 754 755 756 757 |
pid = fown->pid; if (!pid) goto out_unlock_fown; read_lock(&tasklist_lock); |
609d7fa95 [PATCH] file: mod... |
758 |
do_each_pid_task(pid, type, p) { |
ba0a6c9f6 fcntl: add F_[SG]... |
759 |
send_sigio_to_task(p, fown, fd, band, group); |
609d7fa95 [PATCH] file: mod... |
760 |
} while_each_pid_task(pid, type, p); |
1da177e4c Linux-2.6.12-rc2 |
761 762 763 764 765 766 |
read_unlock(&tasklist_lock); out_unlock_fown: read_unlock(&fown->lock); } static void send_sigurg_to_task(struct task_struct *p, |
ba0a6c9f6 fcntl: add F_[SG]... |
767 |
struct fown_struct *fown, int group) |
1da177e4c Linux-2.6.12-rc2 |
768 769 |
{ if (sigio_perm(p, fown, SIGURG)) |
ba0a6c9f6 fcntl: add F_[SG]... |
770 |
do_send_sig_info(SIGURG, SEND_SIG_PRIV, p, group); |
1da177e4c Linux-2.6.12-rc2 |
771 772 773 774 775 |
} int send_sigurg(struct fown_struct *fown) { struct task_struct *p; |
609d7fa95 [PATCH] file: mod... |
776 777 |
enum pid_type type; struct pid *pid; |
ba0a6c9f6 fcntl: add F_[SG]... |
778 |
int group = 1; |
609d7fa95 [PATCH] file: mod... |
779 |
int ret = 0; |
1da177e4c Linux-2.6.12-rc2 |
780 781 |
read_lock(&fown->lock); |
ba0a6c9f6 fcntl: add F_[SG]... |
782 |
|
609d7fa95 [PATCH] file: mod... |
783 |
type = fown->pid_type; |
ba0a6c9f6 fcntl: add F_[SG]... |
784 785 786 787 |
if (type == PIDTYPE_MAX) { group = 0; type = PIDTYPE_PID; } |
1da177e4c Linux-2.6.12-rc2 |
788 789 790 791 792 793 794 |
pid = fown->pid; if (!pid) goto out_unlock_fown; ret = 1; read_lock(&tasklist_lock); |
609d7fa95 [PATCH] file: mod... |
795 |
do_each_pid_task(pid, type, p) { |
ba0a6c9f6 fcntl: add F_[SG]... |
796 |
send_sigurg_to_task(p, fown, group); |
609d7fa95 [PATCH] file: mod... |
797 |
} while_each_pid_task(pid, type, p); |
1da177e4c Linux-2.6.12-rc2 |
798 799 800 801 802 |
read_unlock(&tasklist_lock); out_unlock_fown: read_unlock(&fown->lock); return ret; } |
989a29792 fasync: RCU and f... |
803 |
static DEFINE_SPINLOCK(fasync_lock); |
e18b890bb [PATCH] slab: rem... |
804 |
static struct kmem_cache *fasync_cache __read_mostly; |
1da177e4c Linux-2.6.12-rc2 |
805 |
|
989a29792 fasync: RCU and f... |
806 807 808 809 810 |
static void fasync_free_rcu(struct rcu_head *head) { kmem_cache_free(fasync_cache, container_of(head, struct fasync_struct, fa_rcu)); } |
1da177e4c Linux-2.6.12-rc2 |
811 |
/* |
53281b6d3 fasync: split 'fa... |
812 813 814 815 816 817 818 |
* Remove a fasync entry. If successfully removed, return * positive and clear the FASYNC flag. If no entry exists, * do nothing and return 0. * * NOTE! It is very important that the FASYNC flag always * match the state "is the filp on a fasync list". * |
1da177e4c Linux-2.6.12-rc2 |
819 |
*/ |
f7347ce4e fasync: re-organi... |
820 |
int fasync_remove_entry(struct file *filp, struct fasync_struct **fapp) |
1da177e4c Linux-2.6.12-rc2 |
821 822 |
{ struct fasync_struct *fa, **fp; |
1da177e4c Linux-2.6.12-rc2 |
823 |
int result = 0; |
53281b6d3 fasync: split 'fa... |
824 |
spin_lock(&filp->f_lock); |
989a29792 fasync: RCU and f... |
825 |
spin_lock(&fasync_lock); |
53281b6d3 fasync: split 'fa... |
826 827 828 |
for (fp = fapp; (fa = *fp) != NULL; fp = &fa->fa_next) { if (fa->fa_file != filp) continue; |
989a29792 fasync: RCU and f... |
829 830 831 832 |
spin_lock_irq(&fa->fa_lock); fa->fa_file = NULL; spin_unlock_irq(&fa->fa_lock); |
53281b6d3 fasync: split 'fa... |
833 |
*fp = fa->fa_next; |
989a29792 fasync: RCU and f... |
834 |
call_rcu(&fa->fa_rcu, fasync_free_rcu); |
53281b6d3 fasync: split 'fa... |
835 836 837 |
filp->f_flags &= ~FASYNC; result = 1; break; |
1da177e4c Linux-2.6.12-rc2 |
838 |
} |
989a29792 fasync: RCU and f... |
839 |
spin_unlock(&fasync_lock); |
53281b6d3 fasync: split 'fa... |
840 841 842 |
spin_unlock(&filp->f_lock); return result; } |
f7347ce4e fasync: re-organi... |
843 844 845 846 |
struct fasync_struct *fasync_alloc(void) { return kmem_cache_alloc(fasync_cache, GFP_KERNEL); } |
53281b6d3 fasync: split 'fa... |
847 |
/* |
f7347ce4e fasync: re-organi... |
848 849 850 |
* NOTE! This can be used only for unused fasync entries: * entries that actually got inserted on the fasync list * need to be released by rcu - see fasync_remove_entry. |
53281b6d3 fasync: split 'fa... |
851 |
*/ |
f7347ce4e fasync: re-organi... |
852 |
void fasync_free(struct fasync_struct *new) |
53281b6d3 fasync: split 'fa... |
853 |
{ |
f7347ce4e fasync: re-organi... |
854 855 |
kmem_cache_free(fasync_cache, new); } |
53281b6d3 fasync: split 'fa... |
856 |
|
f7347ce4e fasync: re-organi... |
857 858 859 |
/* * Insert a new entry into the fasync list. Return the pointer to the * old one if we didn't use the new one. |
55f335a88 fasync: Fix place... |
860 861 862 |
* * NOTE! It is very important that the FASYNC flag always * match the state "is the filp on a fasync list". |
f7347ce4e fasync: re-organi... |
863 864 865 866 |
*/ struct fasync_struct *fasync_insert_entry(int fd, struct file *filp, struct fasync_struct **fapp, struct fasync_struct *new) { struct fasync_struct *fa, **fp; |
4a6a44996 Fix a lockdep war... |
867 |
|
4a6a44996 Fix a lockdep war... |
868 |
spin_lock(&filp->f_lock); |
989a29792 fasync: RCU and f... |
869 |
spin_lock(&fasync_lock); |
1da177e4c Linux-2.6.12-rc2 |
870 |
for (fp = fapp; (fa = *fp) != NULL; fp = &fa->fa_next) { |
53281b6d3 fasync: split 'fa... |
871 872 |
if (fa->fa_file != filp) continue; |
989a29792 fasync: RCU and f... |
873 874 |
spin_lock_irq(&fa->fa_lock); |
53281b6d3 fasync: split 'fa... |
875 |
fa->fa_fd = fd; |
989a29792 fasync: RCU and f... |
876 |
spin_unlock_irq(&fa->fa_lock); |
53281b6d3 fasync: split 'fa... |
877 |
goto out; |
1da177e4c Linux-2.6.12-rc2 |
878 |
} |
989a29792 fasync: RCU and f... |
879 |
spin_lock_init(&new->fa_lock); |
53281b6d3 fasync: split 'fa... |
880 881 882 883 |
new->magic = FASYNC_MAGIC; new->fa_file = filp; new->fa_fd = fd; new->fa_next = *fapp; |
989a29792 fasync: RCU and f... |
884 |
rcu_assign_pointer(*fapp, new); |
53281b6d3 fasync: split 'fa... |
885 |
filp->f_flags |= FASYNC; |
1da177e4c Linux-2.6.12-rc2 |
886 |
out: |
989a29792 fasync: RCU and f... |
887 |
spin_unlock(&fasync_lock); |
4a6a44996 Fix a lockdep war... |
888 |
spin_unlock(&filp->f_lock); |
f7347ce4e fasync: re-organi... |
889 890 891 892 893 894 |
return fa; } /* * Add a fasync entry. Return negative on error, positive if * added, and zero if did nothing but change an existing one. |
f7347ce4e fasync: re-organi... |
895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 |
*/ static int fasync_add_entry(int fd, struct file *filp, struct fasync_struct **fapp) { struct fasync_struct *new; new = fasync_alloc(); if (!new) return -ENOMEM; /* * fasync_insert_entry() returns the old (update) entry if * it existed. * * So free the (unused) new entry and return 0 to let the * caller know that we didn't add any new fasync entries. */ if (fasync_insert_entry(fd, filp, fapp, new)) { fasync_free(new); return 0; } return 1; |
1da177e4c Linux-2.6.12-rc2 |
917 |
} |
53281b6d3 fasync: split 'fa... |
918 919 920 921 922 923 924 925 926 927 928 929 |
/* * fasync_helper() is used by almost all character device drivers * to set up the fasync queue, and for regular files by the file * lease code. It returns negative on error, 0 if it did no changes * and positive if it added/deleted the entry. */ int fasync_helper(int fd, struct file * filp, int on, struct fasync_struct **fapp) { if (!on) return fasync_remove_entry(filp, fapp); return fasync_add_entry(fd, filp, fapp); } |
1da177e4c Linux-2.6.12-rc2 |
930 |
EXPORT_SYMBOL(fasync_helper); |
989a29792 fasync: RCU and f... |
931 932 933 934 |
/* * rcu_read_lock() is held */ static void kill_fasync_rcu(struct fasync_struct *fa, int sig, int band) |
1da177e4c Linux-2.6.12-rc2 |
935 936 |
{ while (fa) { |
989a29792 fasync: RCU and f... |
937 |
struct fown_struct *fown; |
f4985dc71 fs/fcntl.c:kill_f... |
938 |
unsigned long flags; |
1da177e4c Linux-2.6.12-rc2 |
939 940 941 942 943 944 |
if (fa->magic != FASYNC_MAGIC) { printk(KERN_ERR "kill_fasync: bad magic number in " "fasync_struct! "); return; } |
f4985dc71 fs/fcntl.c:kill_f... |
945 |
spin_lock_irqsave(&fa->fa_lock, flags); |
989a29792 fasync: RCU and f... |
946 947 948 949 950 951 952 953 |
if (fa->fa_file) { fown = &fa->fa_file->f_owner; /* Don't send SIGURG to processes which have not set a queued signum: SIGURG has its own default signalling mechanism. */ if (!(sig == SIGURG && fown->signum == 0)) send_sigio(fown, fa->fa_fd, band); } |
f4985dc71 fs/fcntl.c:kill_f... |
954 |
spin_unlock_irqrestore(&fa->fa_lock, flags); |
989a29792 fasync: RCU and f... |
955 |
fa = rcu_dereference(fa->fa_next); |
1da177e4c Linux-2.6.12-rc2 |
956 957 |
} } |
1da177e4c Linux-2.6.12-rc2 |
958 959 960 961 962 963 |
void kill_fasync(struct fasync_struct **fp, int sig, int band) { /* First a quick test without locking: usually * the list is empty. */ if (*fp) { |
989a29792 fasync: RCU and f... |
964 965 966 |
rcu_read_lock(); kill_fasync_rcu(rcu_dereference(*fp), sig, band); rcu_read_unlock(); |
1da177e4c Linux-2.6.12-rc2 |
967 968 969 |
} } EXPORT_SYMBOL(kill_fasync); |
454eedb89 vfs: O_* bit numb... |
970 |
static int __init fcntl_init(void) |
1da177e4c Linux-2.6.12-rc2 |
971 |
{ |
3ab04d5cf vfs: take O_NONBL... |
972 973 974 975 976 |
/* * Please add new bits here to ensure allocation uniqueness. * Exceptions: O_NONBLOCK is a two bit define on parisc; O_NDELAY * is defined as O_NONBLOCK on some platforms and not on others. */ |
80f18379a fs: add a VALID_O... |
977 978 979 980 |
BUILD_BUG_ON(21 - 1 /* for O_RDONLY being 0 */ != HWEIGHT32( (VALID_OPEN_FLAGS & ~(O_NONBLOCK | O_NDELAY)) | __FMODE_EXEC | __FMODE_NONOTIFY)); |
454eedb89 vfs: O_* bit numb... |
981 |
|
1da177e4c Linux-2.6.12-rc2 |
982 |
fasync_cache = kmem_cache_create("fasync_cache", |
20c2df83d mm: Remove slab d... |
983 |
sizeof(struct fasync_struct), 0, SLAB_PANIC, NULL); |
1da177e4c Linux-2.6.12-rc2 |
984 985 |
return 0; } |
454eedb89 vfs: O_* bit numb... |
986 |
module_init(fcntl_init) |