cregit-Linux how code gets into the kernel

Release 4.15 fs/fcntl.c

Directory: fs
// SPDX-License-Identifier: GPL-2.0
/*
 *  linux/fs/fcntl.c
 *
 *  Copyright (C) 1991, 1992  Linus Torvalds
 */

#include <linux/syscalls.h>
#include <linux/init.h>
#include <linux/mm.h>
#include <linux/sched/task.h>
#include <linux/fs.h>
#include <linux/file.h>
#include <linux/fdtable.h>
#include <linux/capability.h>
#include <linux/dnotify.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/pipe_fs_i.h>
#include <linux/security.h>
#include <linux/ptrace.h>
#include <linux/signal.h>
#include <linux/rcupdate.h>
#include <linux/pid_namespace.h>
#include <linux/user_namespace.h>
#include <linux/shmem_fs.h>
#include <linux/compat.h>

#include <asm/poll.h>
#include <asm/siginfo.h>
#include <linux/uaccess.h>


#define SETFL_MASK (O_APPEND | O_NONBLOCK | O_NDELAY | O_DIRECT | O_NOATIME)


static int setfl(int fd, struct file * filp, unsigned long arg) { struct inode * inode = file_inode(filp); int error = 0; /* * 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)) return -EPERM; /* O_NOATIME can only be set by the owner or superuser */ if ((arg & O_NOATIME) && !(filp->f_flags & O_NOATIME)) if (!inode_owner_or_capable(inode)) return -EPERM; /* required for strict SunOS emulation */ if (O_NONBLOCK != O_NDELAY) if (arg & O_NDELAY) arg |= O_NONBLOCK; /* Pipe packetized mode is controlled by O_DIRECT flag */ if (!S_ISFIFO(inode->i_mode) && (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->check_flags) error = filp->f_op->check_flags(arg); if (error) return error; /* * ->fasync() is responsible for setting the FASYNC bit. */ if (((arg ^ filp->f_flags) & FASYNC) && filp->f_op->fasync) { error = filp->f_op->fasync(fd, filp, (arg & FASYNC) != 0); if (error < 0) goto out; if (error > 0) error = 0; } spin_lock(&filp->f_lock); filp->f_flags = (arg & SETFL_MASK) | (filp->f_flags & ~SETFL_MASK); spin_unlock(&filp->f_lock); out: return error; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)11240.14%318.75%
Matthew Wilcox8028.67%212.50%
Jonathan Corbet3010.75%318.75%
Cesar Eduardo Barros2810.04%16.25%
Stanislav Kinsburskiy103.58%16.25%
Dean Gaudet72.51%16.25%
Andrew Morton62.15%16.25%
Al Viro41.43%212.50%
Satyam Sharma10.36%16.25%
Serge E. Hallyn10.36%16.25%
Total279100.00%16100.00%


static void f_modown(struct file *filp, struct pid *pid, enum pid_type type, int force) { write_lock_irq(&filp->f_owner.lock); if (force || !filp->f_owner.pid) { put_pid(filp->f_owner.pid); filp->f_owner.pid = get_pid(pid); filp->f_owner.pid_type = type; if (pid) { const struct cred *cred = current_cred(); filp->f_owner.uid = cred->uid; filp->f_owner.euid = cred->euid; } } write_unlock_irq(&filp->f_owner.lock); }

Contributors

PersonTokensPropCommitsCommitProp
James Morris7159.66%125.00%
Eric W. Biedermann2722.69%125.00%
Oleg Nesterov1915.97%125.00%
Linus Torvalds21.68%125.00%
Total119100.00%4100.00%


void __f_setown(struct file *filp, struct pid *pid, enum pid_type type, int force) { security_file_set_fowner(filp); f_modown(filp, pid, type, force); }

Contributors

PersonTokensPropCommitsCommitProp
James Morris2360.53%120.00%
Eric W. Biedermann1231.58%120.00%
Greg Kroah-Hartman25.26%240.00%
Jeff Layton12.63%120.00%
Total38100.00%5100.00%

EXPORT_SYMBOL(__f_setown);
int f_setown(struct file *filp, unsigned long arg, int force) { enum pid_type type; struct pid *pid = NULL; int who = arg, ret = 0; type = PIDTYPE_PID; if (who < 0) { /* avoid overflow below */ if (who == INT_MIN) return -EINVAL; type = PIDTYPE_PGID; who = -who; } rcu_read_lock(); if (who) { pid = find_vpid(who); if (!pid) ret = -ESRCH; } if (!ret) __f_setown(filp, pid, type, force); rcu_read_unlock(); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Eric W. Biedermann7463.25%120.00%
Jeff Layton2823.93%120.00%
Jiri Slaby1411.97%240.00%
Pavel Emelyanov10.85%120.00%
Total117100.00%5100.00%

EXPORT_SYMBOL(f_setown);
void f_delown(struct file *filp) { f_modown(filp, NULL, PIDTYPE_PID, 1); }

Contributors

PersonTokensPropCommitsCommitProp
James Morris1885.71%150.00%
Eric W. Biedermann314.29%150.00%
Total21100.00%2100.00%


pid_t f_getown(struct file *filp) { pid_t pid; read_lock(&filp->f_owner.lock); pid = pid_vnr(filp->f_owner.pid); if (filp->f_owner.pid_type == PIDTYPE_PGID) pid = -pid; read_unlock(&filp->f_owner.lock); return pid; }

Contributors

PersonTokensPropCommitsCommitProp
Eric W. Biedermann6198.39%266.67%
Pavel Emelyanov11.61%133.33%
Total62100.00%3100.00%


static int f_setown_ex(struct file *filp, unsigned long arg) { struct f_owner_ex __user *owner_p = (void __user *)arg; struct f_owner_ex owner; struct pid *pid; int type; int ret; ret = copy_from_user(&owner, owner_p, sizeof(owner)); if (ret) return -EFAULT; switch (owner.type) { case F_OWNER_TID: type = PIDTYPE_MAX; break; case F_OWNER_PID: type = PIDTYPE_PID; break; case F_OWNER_PGRP: type = PIDTYPE_PGID; break; default: return -EINVAL; } rcu_read_lock(); pid = find_vpid(owner.pid); if (owner.pid && !pid) ret = -ESRCH; else __f_setown(filp, pid, type, 1); rcu_read_unlock(); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Peter Zijlstra14397.28%250.00%
Al Viro21.36%125.00%
Dan Carpenter21.36%125.00%
Total147100.00%4100.00%


static int f_getown_ex(struct file *filp, unsigned long arg) { struct f_owner_ex __user *owner_p = (void __user *)arg; 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: owner.type = F_OWNER_PGRP; break; default: WARN_ON(1); ret = -EINVAL; break; } read_unlock(&filp->f_owner.lock); if (!ret) { ret = copy_to_user(owner_p, &owner, sizeof(owner)); if (ret) ret = -EFAULT; } return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Peter Zijlstra14391.67%250.00%
Dan Carpenter117.05%125.00%
Al Viro21.28%125.00%
Total156100.00%4100.00%

#ifdef CONFIG_CHECKPOINT_RESTORE
static int f_getowner_uids(struct file *filp, unsigned long arg) { struct user_namespace *user_ns = current_user_ns(); uid_t __user *dst = (void __user *)arg; 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; }

Contributors

PersonTokensPropCommitsCommitProp
Cyrill V. Gorcunov12998.47%150.00%
Al Viro21.53%150.00%
Total131100.00%2100.00%

#else
static int f_getowner_uids(struct file *filp, unsigned long arg) { return -EINVAL; }

Contributors

PersonTokensPropCommitsCommitProp
Cyrill V. Gorcunov19100.00%1100.00%
Total19100.00%1100.00%

#endif
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; } }

Contributors

PersonTokensPropCommitsCommitProp
Jens Axboe41100.00%1100.00%
Total41100.00%1100.00%


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; u64 h; switch (cmd) { case F_GET_FILE_RW_HINT: h = file_write_hint(file); if (copy_to_user(argp, &h, sizeof(*argp))) return -EFAULT; return 0; case F_SET_FILE_RW_HINT: if (copy_from_user(&h, argp, sizeof(h))) return -EFAULT; hint = (enum rw_hint) h; 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: h = inode->i_write_hint; if (copy_to_user(argp, &h, sizeof(*argp))) return -EFAULT; return 0; case F_SET_RW_HINT: if (copy_from_user(&h, argp, sizeof(h))) return -EFAULT; hint = (enum rw_hint) h; if (!rw_hint_valid(hint)) return -EINVAL; inode_lock(inode); inode->i_write_hint = hint; inode_unlock(inode); return 0; default: return -EINVAL; } }

Contributors

PersonTokensPropCommitsCommitProp
Jens Axboe251100.00%2100.00%
Total251100.00%2100.00%


static long do_fcntl(int fd, unsigned int cmd, unsigned long arg, struct file *filp) { void __user *argp = (void __user *)arg; struct flock flock; long err = -EINVAL; switch (cmd) { case F_DUPFD: err = f_dupfd(arg, filp, 0); break; case F_DUPFD_CLOEXEC: err = f_dupfd(arg, filp, O_CLOEXEC); 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; #if BITS_PER_LONG != 32 /* 32-bit arches must use fcntl64() */ case F_OFD_GETLK: #endif case F_GETLK: 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; break; #if BITS_PER_LONG != 32 /* 32-bit arches must use fcntl64() */ case F_OFD_SETLK: case F_OFD_SETLKW: #endif /* Fallthrough */ case F_SETLK: case F_SETLKW: if (copy_from_user(&flock, argp, sizeof(flock))) return -EFAULT; err = fcntl_setlk(fd, filp, cmd, &flock); 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. */ err = f_getown(filp); force_successful_syscall_return(); break; case F_SETOWN: err = f_setown(filp, arg, 1); break; case F_GETOWN_EX: err = f_getown_ex(filp, arg); break; case F_SETOWN_EX: err = f_setown_ex(filp, arg); break; case F_GETOWNER_UIDS: err = f_getowner_uids(filp, arg); break; case F_GETSIG: err = filp->f_owner.signum; break; case F_SETSIG: /* arg == 0 restores default behaviour. */ if (!valid_signal(arg)) { 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; case F_SETPIPE_SZ: case F_GETPIPE_SZ: err = pipe_fcntl(filp, cmd, arg); break; case F_ADD_SEALS: case F_GET_SEALS: err = shmem_fcntl(filp, cmd, arg); break; 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; default: break; } return err; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)21845.89%1336.11%
Christoph Hellwig7816.42%12.78%
Jens Axboe428.84%25.56%
Jeff Layton285.89%38.33%
Peter Zijlstra265.47%12.78%
Al Viro214.42%38.33%
David Herrmann183.79%12.78%
Cyrill V. Gorcunov132.74%12.78%
James Morris61.26%12.78%
David Howells51.05%12.78%
Andrew Morton40.84%25.56%
Jesper Juhl40.84%12.78%
Eric W. Biedermann30.63%12.78%
Matthew Wilcox20.42%12.78%
Jiri Slaby20.42%12.78%
Peter Staubach20.42%12.78%
Stephen Rothwell20.42%12.78%
Ulrich Drepper10.21%12.78%
Total475100.00%36100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
Al Viro36100.00%1100.00%
Total36100.00%1100.00%

SYSCALL_DEFINE3(fcntl, unsigned int, fd, unsigned int, cmd, unsigned long, arg) { struct fd f = fdget_raw(fd); long err = -EBADF; if (!f.file) goto out; if (unlikely(f.file->f_mode & FMODE_PATH)) { if (!check_fcntl_cmd(cmd)) goto out1; } err = security_file_fcntl(f.file, cmd, arg); if (!err) err = do_fcntl(fd, cmd, arg, f.file); out1: fdput(f); out: return err; } #if BITS_PER_LONG == 32 SYSCALL_DEFINE3(fcntl64, unsigned int, fd, unsigned int, cmd, unsigned long, arg) { void __user *argp = (void __user *)arg; struct fd f = fdget_raw(fd); struct flock64 flock; long err = -EBADF; if (!f.file) goto out; if (unlikely(f.file->f_mode & FMODE_PATH)) { if (!check_fcntl_cmd(cmd)) goto out1; } err = security_file_fcntl(f.file, cmd, arg); if (err) goto out1; switch (cmd) { case F_GETLK64: case F_OFD_GETLK: 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; break; case F_SETLK64: case F_SETLKW64: case F_OFD_SETLK: case F_OFD_SETLKW: err = -EFAULT; if (copy_from_user(&flock, argp, sizeof(flock))) break; err = fcntl_setlk64(fd, f.file, cmd, &flock); break; default: err = do_fcntl(fd, cmd, arg, f.file); break; } out1: fdput(f); out: return err; } #endif #ifdef CONFIG_COMPAT /* careful - don't use anywhere else */ #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) { struct compat_flock fl; if (copy_from_user(&fl, ufl, sizeof(struct compat_flock))) return -EFAULT; copy_flock_fields(kfl, &fl); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Al Viro5196.23%266.67%
Linus Torvalds23.77%133.33%
Total53100.00%3100.00%


static int get_compat_flock64(struct flock *kfl, const struct compat_flock64 __user *ufl) { struct compat_flock64 fl; if (copy_from_user(&fl, ufl, sizeof(struct compat_flock64))) return -EFAULT; copy_flock_fields(kfl, &fl); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Al Viro5196.23%266.67%
Linus Torvalds23.77%133.33%
Total53100.00%3100.00%


static int put_compat_flock(const struct flock *kfl, struct compat_flock __user *ufl) { struct compat_flock fl; memset(&fl, 0, sizeof(struct compat_flock)); copy_flock_fields(&fl, kfl); if (copy_to_user(ufl, &fl, sizeof(struct compat_flock))) return -EFAULT; return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Al Viro6597.01%266.67%
Linus Torvalds22.99%133.33%
Total67100.00%3100.00%


static int put_compat_flock64(const struct flock *kfl, struct compat_flock64 __user *ufl) { struct compat_flock64 fl; BUILD_BUG_ON(sizeof(kfl->l_start) > sizeof(ufl->l_start)); BUILD_BUG_ON(sizeof(kfl->l_len) > sizeof(ufl->l_len)); memset(&fl, 0, sizeof(struct compat_flock64)); copy_flock_fields(&fl, kfl); if (copy_to_user(ufl, &fl, sizeof(struct compat_flock64))) return -EFAULT; return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Al Viro6564.36%250.00%
Jeff Layton3433.66%125.00%
Linus Torvalds21.98%125.00%
Total101100.00%4100.00%

#undef copy_flock_fields
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; }

Contributors

PersonTokensPropCommitsCommitProp
Al Viro38100.00%1100.00%
Total38100.00%1100.00%

/* * 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; }

Contributors

PersonTokensPropCommitsCommitProp
Christoph Hellwig40100.00%1100.00%
Total40100.00%1100.00%

COMPAT_SYSCALL_DEFINE3(fcntl64, unsigned int, fd, unsigned int, cmd, compat_ulong_t, arg) { 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; switch (cmd) { case F_GETLK: 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); if (!err) err = put_compat_flock(&flock, compat_ptr(arg)); 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); if (!err) err = put_compat_flock64(&flock, compat_ptr(arg)); break; case F_SETLK: case F_SETLKW: err = get_compat_flock(&flock, compat_ptr(arg)); if (err) break; err = fcntl_setlk(fd, f.file, convert_fcntl_cmd(cmd), &flock); break; case F_SETLK64: case F_SETLKW64: case F_OFD_SETLK: case F_OFD_SETLKW: err = get_compat_flock64(&flock, compat_ptr(arg)); if (err) break; err = fcntl_setlk(fd, f.file, convert_fcntl_cmd(cmd), &flock); break; default: err = do_fcntl(fd, cmd, arg, f.file); break; } out_put: fdput(f); return err; } 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 /* Table to convert sigio signal codes into poll band bitmaps */ static const long band_table[NSIGPOLL] = { 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) { const struct cred *cred; int ret; rcu_read_lock(); cred = __task_cred(p); 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)) && !security_file_send_sigiotask(p, fown, sig)); rcu_read_unlock(); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)3833.33%444.44%
David Howells3127.19%222.22%
Eric W. Biedermann2118.42%111.11%
Chris Wright1513.16%111.11%
James Morris97.89%111.11%
Total114100.00%9100.00%


static void send_sigio_to_task(struct task_struct *p, struct fown_struct *fown, int fd, int reason, int group) { /* * F_SETSIG can change ->signum lockless in parallel, make * sure we read it once and use the same value throughout. */ int signum = READ_ONCE(fown->signum); if (!sigio_perm(p, fown, signum)) return; switch (signum) { 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 */ si.si_signo = signum; si.si_errno = 0; si.si_code = reason; /* * 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. */ if ((signum != SIGPOLL) && sig_specific_sicodes(signum)) si.si_code = SI_SIGIO; /* Make sure we are called with one of the POLL_* reasons, otherwise we could leak kernel stack into userspace. */ BUG_ON((reason < POLL_IN) || ((reason - POLL_IN) >= NSIGPOLL)); if (reason - POLL_IN >= NSIGPOLL) si.si_band = ~0L; else si.si_band = band_table[reason - POLL_IN]; si.si_fd = fd; if (!do_send_sig_info(signum, &si, p, group)) break; /* fall-through: fall back on the old plain SIGIO signal */ case 0: do_send_sig_info(SIGIO, SEND_SIG_PRIV, p, group); } }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)9150.00%842.11%
Eric W. Biedermann3217.58%210.53%
James Morris2915.93%15.26%
Oleg Nesterov147.69%210.53%
Peter Zijlstra52.75%15.26%
Stephen D. Smalley42.20%15.26%
Eric Sesterhenn / Snakebyte31.65%15.26%
Roland McGrath21.10%15.26%
Chris Wright10.55%15.26%
Mark Rutland10.55%15.26%
Total182100.00%19100.00%


void send_sigio(struct fown_struct *fown, int fd, int band) { struct task_struct *p; enum pid_type type; struct pid *pid; int group = 1; read_lock(&fown->lock); type = fown->pid_type; if (type == PIDTYPE_MAX) { group = 0; type = PIDTYPE_PID; } pid = fown->pid; if (!pid) goto out_unlock_fown; read_lock(&tasklist_lock); do_each_pid_task(pid, type, p) { send_sigio_to_task(p, fown, fd, band, group); } while_each_pid_task(pid, type, p); read_unlock(&tasklist_lock); out_unlock_fown: read_unlock(&fown->lock); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)4433.08%333.33%
James Morris3727.82%111.11%
Peter Zijlstra2317.29%111.11%
Eric W. Biedermann1813.53%111.11%
Kirill Korotaev75.26%111.11%
Ingo Molnar21.50%111.11%
Matthew Wilcox21.50%111.11%
Total133100.00%9100.00%


static void send_sigurg_to_task(struct task_struct *p, struct fown_struct *fown, int group) { if (sigio_perm(p, fown, SIGURG)) do_send_sig_info(SIGURG, SEND_SIG_PRIV, p, group); }

Contributors

PersonTokensPropCommitsCommitProp
James Morris3175.61%125.00%
Peter Zijlstra614.63%125.00%
Chris Wright24.88%125.00%
Roland McGrath24.88%125.00%
Total41100.00%4100.00%


int send_sigurg(struct fown_struct *fown) { struct task_struct *p; enum pid_type type; struct pid *pid; int group = 1; int ret = 0; read_lock(&fown->lock); type = fown->pid_type; if (type == PIDTYPE_MAX) { group = 0; type = PIDTYPE_PID; } pid = fown->pid; if (!pid) goto out_unlock_fown; ret = 1; read_lock(&tasklist_lock); do_each_pid_task(pid, type, p) { send_sigurg_to_task(p, fown, group); } while_each_pid_task(pid, type, p); read_unlock(&tasklist_lock); out_unlock_fown: read_unlock(&fown->lock); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
James Morris7757.04%116.67%
Peter Zijlstra2317.04%116.67%
Eric W. Biedermann2014.81%116.67%
Linus Torvalds (pre-git)75.19%116.67%
Kirill Korotaev75.19%116.67%
Matthew Wilcox10.74%116.67%
Total135100.00%6100.00%

static DEFINE_SPINLOCK(fasync_lock); static struct kmem_cache *fasync_cache __read_mostly;
static void fasync_free_rcu(struct rcu_head *head) { kmem_cache_free(fasync_cache, container_of(head, struct fasync_struct, fa_rcu)); }

Contributors

PersonTokensPropCommitsCommitProp
Eric Dumazet26100.00%1100.00%
Total26100.00%1100.00%

/* * 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". * */
int fasync_remove_entry(struct file *filp, struct fasync_struct **fapp) { struct fasync_struct *fa, **fp; int result = 0; spin_lock(&filp->f_lock); spin_lock(&fasync_lock); for (fp = fapp; (fa = *fp) != NULL; fp = &fa->fa_next) { if (fa->fa_file != filp) continue; spin_lock_irq(&fa->fa_lock); fa->fa_file = NULL; spin_unlock_irq(&fa->fa_lock); *fp = fa->fa_next; call_rcu(&fa->fa_rcu, fasync_free_rcu); filp->f_flags &= ~FASYNC; result = 1; break; } spin_unlock(&fasync_lock); spin_unlock(&filp->f_lock); return result; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds9263.45%133.33%
Eric Dumazet3020.69%133.33%
Linus Torvalds (pre-git)2315.86%133.33%
Total145100.00%3100.00%


struct fasync_struct *fasync_alloc(void) { return kmem_cache_alloc(fasync_cache, GFP_KERNEL); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds17100.00%1100.00%
Total17100.00%1100.00%

/* * 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. */
void fasync_free(struct fasync_struct *new) { kmem_cache_free(fasync_cache, new); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds17100.00%1100.00%
Total17100.00%1100.00%

/* * Insert a new entry into the fasync list. Return the pointer to the * old one if we didn't use the new one. * * NOTE! It is very important that the FASYNC flag always * match the state "is the filp on a fasync list". */
struct fasync_struct *fasync_insert_entry(int fd, struct file *filp, struct fasync_struct **fapp, struct fasync_struct *new) { struct fasync_struct *fa, **fp; spin_lock(&filp->f_lock); spin_lock(&fasync_lock); for (fp = fapp; (fa = *fp) != NULL; fp = &fa->fa_next) { if (fa->fa_file != filp) continue; spin_lock_irq(&fa->fa_lock); fa->fa_fd = fd; spin_unlock_irq(&fa->fa_lock); goto out; } spin_lock_init(&new->fa_lock); new->magic = FASYNC_MAGIC; new->fa_file = filp; new->fa_fd = fd; new->fa_next = *fapp; rcu_assign_pointer(*fapp, new); filp->f_flags |= FASYNC; out: spin_unlock(&fasync_lock); spin_unlock(&filp->f_lock); return fa; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)8448.55%116.67%
Linus Torvalds3620.81%233.33%
Eric Dumazet3017.34%116.67%
Jonathan Corbet2313.29%233.33%
Total173100.00%6100.00%

/* * Add a fasync entry. Return negative on error, positive if * added, and zero if did nothing but change an existing one. */
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; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds6598.48%266.67%
Linus Torvalds (pre-git)11.52%133.33%
Total66100.00%3100.00%

/* * 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); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds4497.78%150.00%
Linus Torvalds (pre-git)12.22%150.00%
Total45100.00%2100.00%

EXPORT_SYMBOL(fasync_helper); /* * rcu_read_lock() is held */
static void kill_fasync_rcu(struct fasync_struct *fa, int sig, int band) { while (fa) { struct fown_struct *fown; unsigned long flags; if (fa->magic != FASYNC_MAGIC) { printk(KERN_ERR "kill_fasync: bad magic number in " "fasync_struct!\n"); return; } spin_lock_irqsave(&fa->fa_lock, flags); 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); } spin_unlock_irqrestore(&fa->fa_lock, flags); fa = rcu_dereference(fa->fa_next); } }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)8569.11%571.43%
Eric Dumazet2822.76%114.29%
Andrew Morton108.13%114.29%
Total123100.00%7100.00%


void kill_fasync(struct fasync_struct **fp, int sig, int band) { /* First a quick test without locking: usually * the list is empty. */ if (*fp) { rcu_read_lock(); kill_fasync_rcu(rcu_dereference(*fp), sig, band); rcu_read_unlock(); } }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)2863.64%133.33%
Andrew Morton818.18%133.33%
Eric Dumazet818.18%133.33%
Total44100.00%3100.00%

EXPORT_SYMBOL(kill_fasync);
static int __init fcntl_init(void) { /* * 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. */ BUILD_BUG_ON(21 - 1 /* for O_RDONLY being 0 */ != HWEIGHT32( (VALID_OPEN_FLAGS & ~(O_NONBLOCK | O_NDELAY)) | __FMODE_EXEC | __FMODE_NONOTIFY)); fasync_cache = kmem_cache_create("fasync_cache", sizeof(struct fasync_struct), 0, SLAB_PANIC, NULL); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)2848.28%111.11%
Fengguang Wu1424.14%111.11%
Christoph Hellwig915.52%111.11%
David Drysdale23.45%111.11%
Namhyung Kim11.72%111.11%
James Bottomley11.72%111.11%
Randy Hron11.72%111.11%
Al Viro11.72%111.11%
Andrew Morton11.72%111.11%
Total58100.00%9100.00%

module_init(fcntl_init)

Overall Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)95120.98%2520.00%
Al Viro66514.67%129.60%
Christoph Hellwig4179.20%32.40%
Peter Zijlstra3698.14%21.60%
Jens Axboe3377.43%32.40%
James Morris3046.71%10.80%
Linus Torvalds2896.38%64.80%
Eric W. Biedermann2766.09%54.00%
Cyrill V. Gorcunov1713.77%10.80%
Eric Dumazet1272.80%21.60%
Jeff Layton1042.29%75.60%
Matthew Wilcox851.88%32.40%
Jonathan Corbet541.19%43.20%
David Howells360.79%32.40%
Andrew Morton350.77%75.60%
Oleg Nesterov330.73%32.40%
Heiko Carstens320.71%10.80%
Cesar Eduardo Barros280.62%10.80%
Stephen D. Smalley250.55%10.80%
David Herrmann210.46%10.80%
Chris Wright180.40%10.80%
Jiri Slaby160.35%21.60%
Fengguang Wu150.33%10.80%
Arnaldo Carvalho de Melo150.33%10.80%
Kirill Korotaev140.31%10.80%
Greg Kroah-Hartman130.29%32.40%
Dan Carpenter130.29%10.80%
Stanislav Kinsburskiy100.22%10.80%
Dean Gaudet70.15%10.80%
Jesper Juhl70.15%10.80%
Pavel Emelyanov50.11%21.60%
Ingo Molnar50.11%21.60%
Roland McGrath40.09%10.80%
Peter Staubach40.09%10.80%
Dipankar Sarma30.07%10.80%
Randy Dunlap30.07%10.80%
Eric Sesterhenn / Snakebyte30.07%10.80%
Arnd Bergmann30.07%10.80%
Thomas Gleixner30.07%10.80%
Stephen Rothwell20.04%10.80%
David Drysdale20.04%10.80%
Christoph Lameter20.04%10.80%
Namhyung Kim10.02%10.80%
Randy Hron10.02%10.80%
Serge E. Hallyn10.02%10.80%
Ulrich Drepper10.02%10.80%
James Bottomley10.02%10.80%
Mark Rutland10.02%10.80%
Satyam Sharma10.02%10.80%
Total4533100.00%125100.00%
Directory: fs
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