From 70181a23afe974204ddeda0d9637e4feb040befd Mon Sep 17 00:00:00 2001 From: Jeff Layton Date: Tue, 22 Apr 2014 08:23:58 -0400 Subject: [PATCH] locks: rename file-private locks to "open file description locks" File-private locks have been merged into Linux for v3.15, and *now* people are commenting that the name and macro definitions for the new file-private locks suck. ...and I can't even disagree. The names and command macros do suck. We're going to have to live with these for a long time, so it's important that we be happy with the names before we're stuck with them. The consensus on the lists so far is that they should be rechristened as "open file description locks". The name isn't a big deal for the kernel, but the command macros are not visually distinct enough from the traditional POSIX lock macros. The glibc and documentation folks are recommending that we change them to look like F_OFD_{GETLK|SETLK|SETLKW}. That lessens the chance that a programmer will typo one of the commands wrong, and also makes it easier to spot this difference when reading code. This patch makes the following changes that I think are necessary before v3.15 ships: 1) rename the command macros to their new names. These end up in the uapi headers and so are part of the external-facing API. It turns out that glibc doesn't actually use the fcntl.h uapi header, but it's hard to be sure that something else won't. Changing it now is safest. 2) make the the /proc/locks output display these as type "OFDLCK" Cc: Michael Kerrisk Cc: Christoph Hellwig Cc: Carlos O'Donell Cc: Stefan Metzmacher Cc: Andy Lutomirski Cc: Frank Filz Cc: Theodore Ts'o Signed-off-by: Jeff Layton Change-Id: Ia975197281d4c80a4ad420d7621896d2f369cef6 Signed-off-by: Kevin F. Haggerty --- arch/arm/kernel/sys_oabi-compat.c | 6 +++--- fs/compat.c | 14 +++++++------- fs/fcntl.c | 12 ++++++------ fs/locks.c | 12 ++++++------ include/uapi/asm-generic/fcntl.h | 6 +++--- security/selinux_n/hooks.c | 6 +++--- 6 files changed, 28 insertions(+), 28 deletions(-) diff --git a/arch/arm/kernel/sys_oabi-compat.c b/arch/arm/kernel/sys_oabi-compat.c index 7a41528bdb0..8a1c2c8a1a6 100644 --- a/arch/arm/kernel/sys_oabi-compat.c +++ b/arch/arm/kernel/sys_oabi-compat.c @@ -232,9 +232,9 @@ asmlinkage long sys_oabi_fcntl64(unsigned int fd, unsigned int cmd, unsigned long arg) { switch (cmd) { - case F_GETLKP: - case F_SETLKP: - case F_SETLKPW: + case F_OFD_GETLK: + case F_OFD_SETLK: + case F_OFD_SETLKW: case F_GETLK64: case F_SETLK64: case F_SETLKW64: diff --git a/fs/compat.c b/fs/compat.c index f340dcf11f6..eaf401df564 100644 --- a/fs/compat.c +++ b/fs/compat.c @@ -457,9 +457,9 @@ asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd, case F_GETLK64: case F_SETLK64: case F_SETLKW64: - case F_GETLKP: - case F_SETLKP: - case F_SETLKPW: + case F_OFD_GETLK: + case F_OFD_SETLK: + case F_OFD_SETLKW: ret = get_compat_flock64(&f, compat_ptr(arg)); if (ret != 0) break; @@ -468,7 +468,7 @@ asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd, conv_cmd = convert_fcntl_cmd(cmd); ret = sys_fcntl(fd, conv_cmd, (unsigned long)&f); set_fs(old_fs); - if ((conv_cmd == F_GETLK || conv_cmd == F_GETLKP) && ret == 0) { + if ((conv_cmd == F_GETLK || conv_cmd == F_OFD_GETLK) && ret == 0) { /* need to return lock information - see above for commentary */ if (f.l_start > COMPAT_LOFF_T_MAX) ret = -EOVERFLOW; @@ -493,9 +493,9 @@ asmlinkage long compat_sys_fcntl(unsigned int fd, unsigned int cmd, case F_GETLK64: case F_SETLK64: case F_SETLKW64: - case F_GETLKP: - case F_SETLKP: - case F_SETLKPW: + case F_OFD_GETLK: + case F_OFD_SETLK: + case F_OFD_SETLKW: return -EINVAL; } return compat_sys_fcntl64(fd, cmd, arg); diff --git a/fs/fcntl.c b/fs/fcntl.c index 3476c43e12d..b788814086e 100644 --- a/fs/fcntl.c +++ b/fs/fcntl.c @@ -276,15 +276,15 @@ static long do_fcntl(int fd, unsigned int cmd, unsigned long arg, break; #if BITS_PER_LONG != 32 /* 32-bit arches must use fcntl64() */ - case F_GETLKP: + case F_OFD_GETLK: #endif case F_GETLK: err = fcntl_getlk(filp, cmd, (struct flock __user *) arg); break; #if BITS_PER_LONG != 32 /* 32-bit arches must use fcntl64() */ - case F_SETLKP: - case F_SETLKPW: + case F_OFD_SETLK: + case F_OFD_SETLKW: #endif /* Fallthrough */ case F_SETLK: @@ -405,13 +405,13 @@ SYSCALL_DEFINE3(fcntl64, unsigned int, fd, unsigned int, cmd, switch (cmd) { case F_GETLK64: - case F_GETLKP: + case F_OFD_GETLK: err = fcntl_getlk64(f.file, cmd, (struct flock64 __user *) arg); break; case F_SETLK64: case F_SETLKW64: - case F_SETLKP: - case F_SETLKPW: + case F_OFD_SETLK: + case F_OFD_SETLKW: err = fcntl_setlk64(fd, f.file, cmd, (struct flock64 __user *) arg); break; diff --git a/fs/locks.c b/fs/locks.c index d74772ddea0..cb8d5aa9c43 100644 --- a/fs/locks.c +++ b/fs/locks.c @@ -1738,7 +1738,7 @@ int fcntl_getlk(struct file *filp, unsigned int cmd, struct flock __user *l) if (error) goto out; - if (cmd == F_GETLKP) { + if (cmd == F_OFD_GETLK) { cmd = F_GETLK; file_lock.fl_flags |= FL_FILE_PVT; file_lock.fl_owner = (fl_owner_t)filp; @@ -1868,12 +1868,12 @@ int fcntl_setlk(unsigned int fd, struct file *filp, unsigned int cmd, * FL_FILE_PVT flag and override the owner. */ switch (cmd) { - case F_SETLKP: + case F_OFD_SETLK: cmd = F_SETLK; file_lock->fl_flags |= FL_FILE_PVT; file_lock->fl_owner = (fl_owner_t)filp; break; - case F_SETLKPW: + case F_OFD_SETLKW: cmd = F_SETLKW; file_lock->fl_flags |= FL_FILE_PVT; file_lock->fl_owner = (fl_owner_t)filp; @@ -1947,7 +1947,7 @@ int fcntl_getlk64(struct file *filp, unsigned int cmd, struct flock64 __user *l) if (error) goto out; - if (cmd == F_GETLKP) { + if (cmd == F_OFD_GETLK) { cmd = F_GETLK64; file_lock.fl_flags |= FL_FILE_PVT; file_lock.fl_owner = (fl_owner_t)filp; @@ -2010,12 +2010,12 @@ int fcntl_setlk64(unsigned int fd, struct file *filp, unsigned int cmd, * FL_FILE_PVT flag and override the owner. */ switch (cmd) { - case F_SETLKP: + case F_OFD_SETLK: cmd = F_SETLK64; file_lock->fl_flags |= FL_FILE_PVT; file_lock->fl_owner = (fl_owner_t)filp; break; - case F_SETLKPW: + case F_OFD_SETLKW: cmd = F_SETLKW64; file_lock->fl_flags |= FL_FILE_PVT; file_lock->fl_owner = (fl_owner_t)filp; diff --git a/include/uapi/asm-generic/fcntl.h b/include/uapi/asm-generic/fcntl.h index bd4c16f2d18..cd7f2c443a5 100644 --- a/include/uapi/asm-generic/fcntl.h +++ b/include/uapi/asm-generic/fcntl.h @@ -144,9 +144,9 @@ * automatically when the last reference to the the open file against which * they were acquired is put. */ -#define F_GETLKP 36 -#define F_SETLKP 37 -#define F_SETLKPW 38 +#define F_OFD_GETLK 36 +#define F_OFD_SETLK 37 +#define F_OFD_SETLKW 38 #define F_OWNER_TID 0 #define F_OWNER_PID 1 diff --git a/security/selinux_n/hooks.c b/security/selinux_n/hooks.c index 06b3b39738e..638ee4db212 100644 --- a/security/selinux_n/hooks.c +++ b/security/selinux_n/hooks.c @@ -3702,9 +3702,9 @@ static int selinux_file_fcntl(struct file *file, unsigned int cmd, case F_GETLK: case F_SETLK: case F_SETLKW: - case F_GETLKP: - case F_SETLKP: - case F_SETLKPW: + case F_OFD_GETLK: + case F_OFD_SETLK: + case F_OFD_SETLKW: #if BITS_PER_LONG == 32 case F_GETLK64: case F_SETLK64: -- 2.20.1