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File locking related bugfixes for v3.15 (pile #2)

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- fix for a long-standing bug in __break_lease that can cause soft lockups
 - renaming of file-private locks to "open file description" locks, and the
   command macros to more visually distinct names.
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Merge tag 'locks-v3.15-2' of git://git.samba.org/jlayton/linux

Pull file locking fixes from Jeff Layton:
 "File locking related bugfixes for v3.15 (pile #2)

   - fix for a long-standing bug in __break_lease that can cause soft
     lockups
   - renaming of file-private locks to "open file description" locks,
     and the command macros to more visually distinct names

  The fix for __break_lease is also in the pile of patches for which
  Bruce sent a pull request, but I assume that your merge procedure will
  handle that correctly.

  For the other patches, I don't like the fact that we need to rename
  this stuff at this late stage, but it should be settled now
  (hopefully)"

* tag 'locks-v3.15-2' of git://git.samba.org/jlayton/linux:
  locks: rename FL_FILE_PVT and IS_FILE_PVT to use "*_OFDLCK" instead
  locks: rename file-private locks to "open file description locks"
  locks: allow __break_lease to sleep even when break_time is 0
This commit is contained in:
Linus Torvalds 2014-04-25 12:40:32 -07:00
commit 625bba662c
7 changed files with 54 additions and 54 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
arch/arm/kernel/sys_oabi-compat.c
View File

@ -203,9 +203,9 @@ asmlinkage long sys_oabi_fcntl64(unsigned int fd, unsigned int cmd,
int ret;
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:

14
fs/compat.c
View File

@ -457,9 +457,9 @@ COMPAT_SYSCALL_DEFINE3(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 @@ COMPAT_SYSCALL_DEFINE3(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 @@ COMPAT_SYSCALL_DEFINE3(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);

12
fs/fcntl.c
View File

@ -274,15 +274,15 @@ 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:
@ -399,13 +399,13 @@ 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;

48
fs/locks.c
View File

@ -135,7 +135,7 @@
#define IS_POSIX(fl) (fl->fl_flags & FL_POSIX)
#define IS_FLOCK(fl) (fl->fl_flags & FL_FLOCK)
#define IS_LEASE(fl) (fl->fl_flags & (FL_LEASE|FL_DELEG))
#define IS_FILE_PVT(fl) (fl->fl_flags & FL_FILE_PVT)
#define IS_OFDLCK(fl) (fl->fl_flags & FL_OFDLCK)
static bool lease_breaking(struct file_lock *fl)
{
@ -564,7 +564,7 @@ static void __locks_insert_block(struct file_lock *blocker,
BUG_ON(!list_empty(&waiter->fl_block));
waiter->fl_next = blocker;
list_add_tail(&waiter->fl_block, &blocker->fl_block);
if (IS_POSIX(blocker) && !IS_FILE_PVT(blocker))
if (IS_POSIX(blocker) && !IS_OFDLCK(blocker))
locks_insert_global_blocked(waiter);
}
@ -759,12 +759,12 @@ EXPORT_SYMBOL(posix_test_lock);
* of tasks (such as posix threads) sharing the same open file table.
* To handle those cases, we just bail out after a few iterations.
*
* For FL_FILE_PVT locks, the owner is the filp, not the files_struct.
* For FL_OFDLCK locks, the owner is the filp, not the files_struct.
* Because the owner is not even nominally tied to a thread of
* execution, the deadlock detection below can't reasonably work well. Just
* skip it for those.
*
* In principle, we could do a more limited deadlock detection on FL_FILE_PVT
* In principle, we could do a more limited deadlock detection on FL_OFDLCK
* locks that just checks for the case where two tasks are attempting to
* upgrade from read to write locks on the same inode.
*/
@ -791,9 +791,9 @@ static int posix_locks_deadlock(struct file_lock *caller_fl,
/*
* This deadlock detector can't reasonably detect deadlocks with
* FL_FILE_PVT locks, since they aren't owned by a process, per-se.
* FL_OFDLCK locks, since they aren't owned by a process, per-se.
*/
if (IS_FILE_PVT(caller_fl))
if (IS_OFDLCK(caller_fl))
return 0;
while ((block_fl = what_owner_is_waiting_for(block_fl))) {
@ -1890,7 +1890,7 @@ EXPORT_SYMBOL_GPL(vfs_test_lock);
static int posix_lock_to_flock(struct flock *flock, struct file_lock *fl)
{
flock->l_pid = IS_FILE_PVT(fl) ? -1 : fl->fl_pid;
flock->l_pid = IS_OFDLCK(fl) ? -1 : fl->fl_pid;
#if BITS_PER_LONG == 32
/*
* Make sure we can represent the posix lock via
@ -1912,7 +1912,7 @@ static int posix_lock_to_flock(struct flock *flock, struct file_lock *fl)
#if BITS_PER_LONG == 32
static void posix_lock_to_flock64(struct flock64 *flock, struct file_lock *fl)
{
flock->l_pid = IS_FILE_PVT(fl) ? -1 : fl->fl_pid;
flock->l_pid = IS_OFDLCK(fl) ? -1 : fl->fl_pid;
flock->l_start = fl->fl_start;
flock->l_len = fl->fl_end == OFFSET_MAX ? 0 :
fl->fl_end - fl->fl_start + 1;
@ -1941,13 +1941,13 @@ 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) {
error = -EINVAL;
if (flock.l_pid != 0)
goto out;
cmd = F_GETLK;
file_lock.fl_flags |= FL_FILE_PVT;
file_lock.fl_flags |= FL_OFDLCK;
file_lock.fl_owner = (fl_owner_t)filp;
}
@ -2073,25 +2073,25 @@ again:
/*
* If the cmd is requesting file-private locks, then set the
* FL_FILE_PVT flag and override the owner.
* FL_OFDLCK flag and override the owner.
*/
switch (cmd) {
case F_SETLKP:
case F_OFD_SETLK:
error = -EINVAL;
if (flock.l_pid != 0)
goto out;
cmd = F_SETLK;
file_lock->fl_flags |= FL_FILE_PVT;
file_lock->fl_flags |= FL_OFDLCK;
file_lock->fl_owner = (fl_owner_t)filp;
break;
case F_SETLKPW:
case F_OFD_SETLKW:
error = -EINVAL;
if (flock.l_pid != 0)
goto out;
cmd = F_SETLKW;
file_lock->fl_flags |= FL_FILE_PVT;
file_lock->fl_flags |= FL_OFDLCK;
file_lock->fl_owner = (fl_owner_t)filp;
/* Fallthrough */
case F_SETLKW:
@ -2143,13 +2143,13 @@ 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) {
error = -EINVAL;
if (flock.l_pid != 0)
goto out;
cmd = F_GETLK64;
file_lock.fl_flags |= FL_FILE_PVT;
file_lock.fl_flags |= FL_OFDLCK;
file_lock.fl_owner = (fl_owner_t)filp;
}
@ -2208,25 +2208,25 @@ again:
/*
* If the cmd is requesting file-private locks, then set the
* FL_FILE_PVT flag and override the owner.
* FL_OFDLCK flag and override the owner.
*/
switch (cmd) {
case F_SETLKP:
case F_OFD_SETLK:
error = -EINVAL;
if (flock.l_pid != 0)
goto out;
cmd = F_SETLK64;
file_lock->fl_flags |= FL_FILE_PVT;
file_lock->fl_flags |= FL_OFDLCK;
file_lock->fl_owner = (fl_owner_t)filp;
break;
case F_SETLKPW:
case F_OFD_SETLKW:
error = -EINVAL;
if (flock.l_pid != 0)
goto out;
cmd = F_SETLKW64;
file_lock->fl_flags |= FL_FILE_PVT;
file_lock->fl_flags |= FL_OFDLCK;
file_lock->fl_owner = (fl_owner_t)filp;
/* Fallthrough */
case F_SETLKW64:
@ -2412,8 +2412,8 @@ static void lock_get_status(struct seq_file *f, struct file_lock *fl,
if (IS_POSIX(fl)) {
if (fl->fl_flags & FL_ACCESS)
seq_printf(f, "ACCESS");
else if (IS_FILE_PVT(fl))
seq_printf(f, "FLPVT ");
else if (IS_OFDLCK(fl))
seq_printf(f, "OFDLCK");
else
seq_printf(f, "POSIX ");

2
include/linux/fs.h
View File

@ -815,7 +815,7 @@ static inline struct file *get_file(struct file *f)
#define FL_SLEEP 128 /* A blocking lock */
#define FL_DOWNGRADE_PENDING 256 /* Lease is being downgraded */
#define FL_UNLOCK_PENDING 512 /* Lease is being broken */
#define FL_FILE_PVT 1024 /* lock is private to the file */
#define FL_OFDLCK 1024 /* lock is "owned" by struct file */
/*
* Special return value from posix_lock_file() and vfs_lock_file() for

20
include/uapi/asm-generic/fcntl.h
View File

@ -133,20 +133,20 @@
#endif
/*
* fd "private" POSIX locks.
* Open File Description Locks
*
* Usually POSIX locks held by a process are released on *any* close and are
* Usually record locks held by a process are released on *any* close and are
* not inherited across a fork().
*
* These cmd values will set locks that conflict with normal POSIX locks, but
* are "owned" by the opened file, not the process. This means that they are
* inherited across fork() like BSD (flock) locks, and they are only released
* automatically when the last reference to the the open file against which
* they were acquired is put.
* These cmd values will set locks that conflict with process-associated
* record locks, but are "owned" by the open file description, not the
* process. This means that they are inherited across fork() like BSD (flock)
* locks, and they are only released 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

6
security/selinux/hooks.c
View File

@ -3317,9 +3317,9 @@ 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: