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fs/fcntl.c
14 KB
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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> #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> #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/smp_lock.h> |
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#include <asm/poll.h> #include <asm/siginfo.h> #include <asm/uaccess.h> |
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void set_close_on_exec(unsigned int fd, int flag) |
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{ struct files_struct *files = current->files; |
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struct fdtable *fdt; |
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spin_lock(&files->file_lock); |
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fdt = files_fdtable(files); |
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if (flag) |
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FD_SET(fd, fdt->close_on_exec); |
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else |
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FD_CLR(fd, fdt->close_on_exec); |
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spin_unlock(&files->file_lock); } |
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static int get_close_on_exec(unsigned int fd) |
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{ struct files_struct *files = current->files; |
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struct fdtable *fdt; |
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int res; |
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rcu_read_lock(); |
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fdt = files_fdtable(files); res = FD_ISSET(fd, fdt->close_on_exec); |
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rcu_read_unlock(); |
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return res; } |
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SYSCALL_DEFINE3(dup3, unsigned int, oldfd, unsigned int, newfd, int, flags) |
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{ int err = -EBADF; struct file * file, *tofree; struct files_struct * files = current->files; |
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struct fdtable *fdt; |
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|
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if ((flags & ~O_CLOEXEC) != 0) return -EINVAL; |
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if (unlikely(oldfd == newfd)) return -EINVAL; |
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spin_lock(&files->file_lock); |
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err = expand_files(files, newfd); |
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file = fcheck(oldfd); if (unlikely(!file)) goto Ebadf; |
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if (unlikely(err < 0)) { if (err == -EMFILE) |
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goto Ebadf; goto out_unlock; |
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} |
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/* * We need to detect attempts to do dup2() over allocated but still * not finished descriptor. NB: OpenBSD avoids that at the price of * extra work in their equivalent of fget() - they insert struct * file immediately after grabbing descriptor, mark it larval if * more work (e.g. actual opening) is needed and make sure that * fget() treats larval files as absent. Potentially interesting, * but while extra work in fget() is trivial, locking implications * and amount of surgery on open()-related paths in VFS are not. * FreeBSD fails with -EBADF in the same situation, NetBSD "solution" * deadlocks in rather amusing ways, AFAICS. All of that is out of * scope of POSIX or SUS, since neither considers shared descriptor * tables and this condition does not arise without those. */ |
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err = -EBUSY; |
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fdt = files_fdtable(files); tofree = fdt->fd[newfd]; if (!tofree && FD_ISSET(newfd, fdt->open_fds)) |
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goto out_unlock; get_file(file); |
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rcu_assign_pointer(fdt->fd[newfd], file); |
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FD_SET(newfd, fdt->open_fds); |
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if (flags & O_CLOEXEC) FD_SET(newfd, fdt->close_on_exec); else FD_CLR(newfd, fdt->close_on_exec); |
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spin_unlock(&files->file_lock); if (tofree) filp_close(tofree, files); |
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|
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return newfd; Ebadf: err = -EBADF; out_unlock: |
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spin_unlock(&files->file_lock); |
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return err; |
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} |
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|
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SYSCALL_DEFINE2(dup2, unsigned int, oldfd, unsigned int, newfd) |
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{ |
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if (unlikely(newfd == oldfd)) { /* corner case */ struct files_struct *files = current->files; |
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int retval = oldfd; |
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rcu_read_lock(); if (!fcheck_files(files, oldfd)) |
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retval = -EBADF; |
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rcu_read_unlock(); |
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return retval; |
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} |
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return sys_dup3(oldfd, newfd, 0); } |
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|
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SYSCALL_DEFINE1(dup, unsigned int, fildes) |
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{ int ret = -EBADF; |
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struct file *file = fget(fildes); if (file) { ret = get_unused_fd(); if (ret >= 0) fd_install(ret, file); else fput(file); } |
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return ret; } |
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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 = filp->f_path.dentry->d_inode; |
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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 (!is_owner_or_cap(inode)) |
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return -EPERM; /* required for strict SunOS emulation */ if (O_NONBLOCK != O_NDELAY) if (arg & O_NDELAY) arg |= O_NONBLOCK; if (arg & O_DIRECT) { if (!filp->f_mapping || !filp->f_mapping->a_ops || !filp->f_mapping->a_ops->direct_IO) return -EINVAL; } if (filp->f_op && filp->f_op->check_flags) 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 && filp->f_op->fasync) { 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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{ write_lock_irq(&filp->f_owner.lock); 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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} write_unlock_irq(&filp->f_owner.lock); } |
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int __f_setown(struct file *filp, struct pid *pid, enum pid_type type, int force) |
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{ int err; |
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|
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err = security_file_set_fowner(filp); if (err) return err; |
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f_modown(filp, pid, type, force); |
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return 0; } |
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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) { enum pid_type type; struct pid *pid; int who = arg; int result; type = PIDTYPE_PID; if (who < 0) { type = PIDTYPE_PGID; who = -who; } rcu_read_lock(); |
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pid = find_vpid(who); |
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result = __f_setown(filp, pid, type, force); rcu_read_unlock(); return result; } |
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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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} static long do_fcntl(int fd, unsigned int cmd, unsigned long arg, struct file *filp) { long err = -EINVAL; switch (cmd) { case F_DUPFD: |
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case F_DUPFD_CLOEXEC: |
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if (arg >= current->signal->rlim[RLIMIT_NOFILE].rlim_cur) break; |
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err = alloc_fd(arg, cmd == F_DUPFD_CLOEXEC ? O_CLOEXEC : 0); if (err >= 0) { get_file(filp); fd_install(err, filp); } |
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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; case F_GETLK: err = fcntl_getlk(filp, (struct flock __user *) arg); break; case F_SETLK: case F_SETLKW: |
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err = fcntl_setlk(fd, filp, cmd, (struct flock __user *) arg); |
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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: err = f_setown(filp, arg, 1); break; 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; default: break; } return err; } |
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SYSCALL_DEFINE3(fcntl, unsigned int, fd, unsigned int, cmd, unsigned long, arg) |
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{ struct file *filp; long err = -EBADF; filp = fget(fd); if (!filp) goto out; err = security_file_fcntl(filp, cmd, arg); if (err) { fput(filp); return err; } err = do_fcntl(fd, cmd, arg, filp); fput(filp); 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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{ struct file * filp; long err; err = -EBADF; filp = fget(fd); if (!filp) goto out; err = security_file_fcntl(filp, cmd, arg); if (err) { fput(filp); return err; } err = -EBADF; switch (cmd) { case F_GETLK64: err = fcntl_getlk64(filp, (struct flock64 __user *) arg); break; case F_SETLK64: case F_SETLKW64: |
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err = fcntl_setlk64(fd, filp, cmd, (struct flock64 __user *) arg); |
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break; default: err = do_fcntl(fd, cmd, arg, filp); break; } fput(filp); out: return err; } #endif /* Table to convert sigio signal codes into poll band bitmaps */ |
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static const long band_table[NSIGPOLL] = { |
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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) { |
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const struct cred *cred; int ret; rcu_read_lock(); cred = __task_cred(p); ret = ((fown->euid == 0 || fown->euid == cred->suid || fown->euid == cred->uid || fown->uid == cred->suid || fown->uid == cred->uid) && !security_file_send_sigiotask(p, fown, sig)); rcu_read_unlock(); return ret; |
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} static void send_sigio_to_task(struct task_struct *p, |
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struct fown_struct *fown, |
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int fd, int reason) { |
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/* * 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)) |
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return; |
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switch (signum) { |
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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 */ |
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si.si_signo = signum; |
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si.si_errno = 0; si.si_code = reason; /* Make sure we are called with one of the POLL_* reasons, otherwise we could leak kernel stack into userspace. */ |
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BUG_ON((reason & __SI_MASK) != __SI_POLL); |
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if (reason - POLL_IN >= NSIGPOLL) si.si_band = ~0L; else si.si_band = band_table[reason - POLL_IN]; si.si_fd = fd; |
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if (!group_send_sig_info(signum, &si, p)) |
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break; /* fall-through: fall back on the old plain SIGIO signal */ case 0: |
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group_send_sig_info(SIGIO, SEND_SIG_PRIV, p); |
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} } void send_sigio(struct fown_struct *fown, int fd, int band) { struct task_struct *p; |
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enum pid_type type; struct pid *pid; |
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read_lock(&fown->lock); |
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type = fown->pid_type; |
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pid = fown->pid; if (!pid) goto out_unlock_fown; read_lock(&tasklist_lock); |
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do_each_pid_task(pid, type, p) { send_sigio_to_task(p, fown, fd, band); } while_each_pid_task(pid, type, p); |
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read_unlock(&tasklist_lock); out_unlock_fown: read_unlock(&fown->lock); } static void send_sigurg_to_task(struct task_struct *p, struct fown_struct *fown) { if (sigio_perm(p, fown, SIGURG)) |
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group_send_sig_info(SIGURG, SEND_SIG_PRIV, p); |
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} int send_sigurg(struct fown_struct *fown) { struct task_struct *p; |
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enum pid_type type; struct pid *pid; int ret = 0; |
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read_lock(&fown->lock); |
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type = fown->pid_type; |
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pid = fown->pid; if (!pid) goto out_unlock_fown; ret = 1; read_lock(&tasklist_lock); |
609d7fa95 [PATCH] file: mod... |
502 503 504 |
do_each_pid_task(pid, type, p) { send_sigurg_to_task(p, fown); } while_each_pid_task(pid, type, p); |
1da177e4c Linux-2.6.12-rc2 |
505 506 507 508 509 510 511 |
read_unlock(&tasklist_lock); out_unlock_fown: read_unlock(&fown->lock); return ret; } static DEFINE_RWLOCK(fasync_lock); |
e18b890bb [PATCH] slab: rem... |
512 |
static struct kmem_cache *fasync_cache __read_mostly; |
1da177e4c Linux-2.6.12-rc2 |
513 514 |
/* |
76398425b Move FASYNC bit h... |
515 |
* fasync_helper() is used by almost all character device drivers |
1da177e4c Linux-2.6.12-rc2 |
516 517 518 519 520 521 522 523 524 525 |
* to set up the fasync queue. 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) { struct fasync_struct *fa, **fp; struct fasync_struct *new = NULL; int result = 0; if (on) { |
e94b17660 [PATCH] slab: rem... |
526 |
new = kmem_cache_alloc(fasync_cache, GFP_KERNEL); |
1da177e4c Linux-2.6.12-rc2 |
527 528 529 |
if (!new) return -ENOMEM; } |
4a6a44996 Fix a lockdep war... |
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/* * We need to take f_lock first since it's not an IRQ-safe * lock. */ spin_lock(&filp->f_lock); |
1da177e4c Linux-2.6.12-rc2 |
536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 |
write_lock_irq(&fasync_lock); for (fp = fapp; (fa = *fp) != NULL; fp = &fa->fa_next) { if (fa->fa_file == filp) { if(on) { fa->fa_fd = fd; kmem_cache_free(fasync_cache, new); } else { *fp = fa->fa_next; kmem_cache_free(fasync_cache, fa); result = 1; } goto out; } } if (on) { new->magic = FASYNC_MAGIC; new->fa_file = filp; new->fa_fd = fd; new->fa_next = *fapp; *fapp = new; result = 1; } out: |
76398425b Move FASYNC bit h... |
560 561 562 563 |
if (on) filp->f_flags |= FASYNC; else filp->f_flags &= ~FASYNC; |
1da177e4c Linux-2.6.12-rc2 |
564 |
write_unlock_irq(&fasync_lock); |
4a6a44996 Fix a lockdep war... |
565 |
spin_unlock(&filp->f_lock); |
1da177e4c Linux-2.6.12-rc2 |
566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 |
return result; } EXPORT_SYMBOL(fasync_helper); void __kill_fasync(struct fasync_struct *fa, int sig, int band) { while (fa) { struct fown_struct * fown; if (fa->magic != FASYNC_MAGIC) { printk(KERN_ERR "kill_fasync: bad magic number in " "fasync_struct! "); return; } 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); fa = fa->fa_next; } } EXPORT_SYMBOL(__kill_fasync); void kill_fasync(struct fasync_struct **fp, int sig, int band) { /* First a quick test without locking: usually * the list is empty. */ if (*fp) { read_lock(&fasync_lock); /* reread *fp after obtaining the lock */ __kill_fasync(*fp, sig, band); read_unlock(&fasync_lock); } } EXPORT_SYMBOL(kill_fasync); static int __init fasync_init(void) { fasync_cache = kmem_cache_create("fasync_cache", |
20c2df83d mm: Remove slab d... |
610 |
sizeof(struct fasync_struct), 0, SLAB_PANIC, NULL); |
1da177e4c Linux-2.6.12-rc2 |
611 612 613 614 |
return 0; } module_init(fasync_init) |