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. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIcBAABAgAGBQJTWB/iAAoJEAAOaEEZVoIV2tUP/A1c9YUmgt+LdOJIA2k3Uh9C nNdZss2hj8s91qCRe1Mb7L9UjzTEEiYILYqmXMRW9yUpPI7Oxr5sjqZEqlK5lTso 447QEow93wSE/WIKwwzdbKS+CMRNvIba6EjzQ7h0kU3ExMnFMXwD2QK7eGT2pEko kaQMq5BbxxIaTYmp/tKioacBPbpO3TQpS6ZWv2kZDCk4l1wCdsBNL7h3eqM63L/L A05zA88e3//wxVSPLA5JpQJ5fYkZrz7sqZYd+H80VXn34YQY7/7Kq16fiCprhntq tZb9LWOIJmSruN7r39KJgf43++fpSrv5XPfqsL4TDdwGcYwBAznhItrfOUC0Ja1+ ZY227gHbxBwSeN9jj3zc4peOpzNPdIMnw0CEZVGn/AgssFFh/Ja8PrIQCxjI5djP eLqiiBBznt9HaZWPslWxaKqhdINFyuMp9LbEJ71nXwLQVYY32rOS828FAna982F3 i0A48tPbrGpA1elGnVcsiAmJtAbZA9X6Y5M+gQGU2vWgX5GxiLeXOmEd+kVOaTmu 2WVlwvEc3jTlxg9naGAKsfXwaOKqEIPJDoahWTpSRtNOntNwiPjg0cW80abq+Ybx WaPFhDLyd7290QyOASjyC4TwXMA2XvtQMQ8P+SMWkc2ZscjtuMBfEK9TBalg8tZV vHNrZpqnftIX7u6Y/fuT =rrtj -----END PGP SIGNATURE----- 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:
commit
625bba662c
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@ -203,9 +203,9 @@ asmlinkage long sys_oabi_fcntl64(unsigned int fd, unsigned int cmd,
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int ret;
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switch (cmd) {
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case F_GETLKP:
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case F_SETLKP:
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case F_SETLKPW:
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case F_OFD_GETLK:
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case F_OFD_SETLK:
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case F_OFD_SETLKW:
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case F_GETLK64:
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case F_SETLK64:
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case F_SETLKW64:
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14
fs/compat.c
14
fs/compat.c
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@ -457,9 +457,9 @@ COMPAT_SYSCALL_DEFINE3(fcntl64, unsigned int, fd, unsigned int, cmd,
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case F_GETLK64:
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case F_SETLK64:
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case F_SETLKW64:
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case F_GETLKP:
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case F_SETLKP:
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case F_SETLKPW:
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case F_OFD_GETLK:
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case F_OFD_SETLK:
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case F_OFD_SETLKW:
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ret = get_compat_flock64(&f, compat_ptr(arg));
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if (ret != 0)
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break;
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@ -468,7 +468,7 @@ COMPAT_SYSCALL_DEFINE3(fcntl64, unsigned int, fd, unsigned int, cmd,
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conv_cmd = convert_fcntl_cmd(cmd);
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ret = sys_fcntl(fd, conv_cmd, (unsigned long)&f);
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set_fs(old_fs);
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if ((conv_cmd == F_GETLK || conv_cmd == F_GETLKP) && ret == 0) {
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if ((conv_cmd == F_GETLK || conv_cmd == F_OFD_GETLK) && ret == 0) {
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/* need to return lock information - see above for commentary */
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if (f.l_start > COMPAT_LOFF_T_MAX)
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ret = -EOVERFLOW;
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@ -493,9 +493,9 @@ COMPAT_SYSCALL_DEFINE3(fcntl, unsigned int, fd, unsigned int, cmd,
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case F_GETLK64:
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case F_SETLK64:
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case F_SETLKW64:
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case F_GETLKP:
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case F_SETLKP:
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case F_SETLKPW:
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case F_OFD_GETLK:
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case F_OFD_SETLK:
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case F_OFD_SETLKW:
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return -EINVAL;
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}
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return compat_sys_fcntl64(fd, cmd, arg);
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12
fs/fcntl.c
12
fs/fcntl.c
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@ -274,15 +274,15 @@ static long do_fcntl(int fd, unsigned int cmd, unsigned long arg,
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break;
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#if BITS_PER_LONG != 32
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/* 32-bit arches must use fcntl64() */
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case F_GETLKP:
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case F_OFD_GETLK:
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#endif
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case F_GETLK:
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err = fcntl_getlk(filp, cmd, (struct flock __user *) arg);
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break;
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#if BITS_PER_LONG != 32
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/* 32-bit arches must use fcntl64() */
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case F_SETLKP:
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case F_SETLKPW:
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case F_OFD_SETLK:
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case F_OFD_SETLKW:
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#endif
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/* Fallthrough */
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case F_SETLK:
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@ -399,13 +399,13 @@ SYSCALL_DEFINE3(fcntl64, unsigned int, fd, unsigned int, cmd,
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switch (cmd) {
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case F_GETLK64:
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case F_GETLKP:
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case F_OFD_GETLK:
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err = fcntl_getlk64(f.file, cmd, (struct flock64 __user *) arg);
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break;
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case F_SETLK64:
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case F_SETLKW64:
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case F_SETLKP:
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case F_SETLKPW:
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case F_OFD_SETLK:
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case F_OFD_SETLKW:
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err = fcntl_setlk64(fd, f.file, cmd,
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(struct flock64 __user *) arg);
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break;
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48
fs/locks.c
48
fs/locks.c
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@ -135,7 +135,7 @@
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#define IS_POSIX(fl) (fl->fl_flags & FL_POSIX)
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#define IS_FLOCK(fl) (fl->fl_flags & FL_FLOCK)
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#define IS_LEASE(fl) (fl->fl_flags & (FL_LEASE|FL_DELEG))
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#define IS_FILE_PVT(fl) (fl->fl_flags & FL_FILE_PVT)
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#define IS_OFDLCK(fl) (fl->fl_flags & FL_OFDLCK)
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static bool lease_breaking(struct file_lock *fl)
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{
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@ -564,7 +564,7 @@ static void __locks_insert_block(struct file_lock *blocker,
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BUG_ON(!list_empty(&waiter->fl_block));
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waiter->fl_next = blocker;
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list_add_tail(&waiter->fl_block, &blocker->fl_block);
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if (IS_POSIX(blocker) && !IS_FILE_PVT(blocker))
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if (IS_POSIX(blocker) && !IS_OFDLCK(blocker))
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locks_insert_global_blocked(waiter);
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}
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@ -759,12 +759,12 @@ EXPORT_SYMBOL(posix_test_lock);
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* of tasks (such as posix threads) sharing the same open file table.
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* To handle those cases, we just bail out after a few iterations.
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*
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* For FL_FILE_PVT locks, the owner is the filp, not the files_struct.
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* For FL_OFDLCK locks, the owner is the filp, not the files_struct.
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* Because the owner is not even nominally tied to a thread of
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* execution, the deadlock detection below can't reasonably work well. Just
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* skip it for those.
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*
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* In principle, we could do a more limited deadlock detection on FL_FILE_PVT
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* In principle, we could do a more limited deadlock detection on FL_OFDLCK
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* locks that just checks for the case where two tasks are attempting to
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* upgrade from read to write locks on the same inode.
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*/
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/*
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* This deadlock detector can't reasonably detect deadlocks with
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* FL_FILE_PVT locks, since they aren't owned by a process, per-se.
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* FL_OFDLCK locks, since they aren't owned by a process, per-se.
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*/
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if (IS_FILE_PVT(caller_fl))
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if (IS_OFDLCK(caller_fl))
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return 0;
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while ((block_fl = what_owner_is_waiting_for(block_fl))) {
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static int posix_lock_to_flock(struct flock *flock, struct file_lock *fl)
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{
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flock->l_pid = IS_FILE_PVT(fl) ? -1 : fl->fl_pid;
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flock->l_pid = IS_OFDLCK(fl) ? -1 : fl->fl_pid;
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#if BITS_PER_LONG == 32
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/*
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* Make sure we can represent the posix lock via
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#if BITS_PER_LONG == 32
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static void posix_lock_to_flock64(struct flock64 *flock, struct file_lock *fl)
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{
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flock->l_pid = IS_FILE_PVT(fl) ? -1 : fl->fl_pid;
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flock->l_pid = IS_OFDLCK(fl) ? -1 : fl->fl_pid;
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flock->l_start = fl->fl_start;
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flock->l_len = fl->fl_end == OFFSET_MAX ? 0 :
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fl->fl_end - fl->fl_start + 1;
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if (error)
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goto out;
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if (cmd == F_GETLKP) {
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if (cmd == F_OFD_GETLK) {
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error = -EINVAL;
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if (flock.l_pid != 0)
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goto out;
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cmd = F_GETLK;
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file_lock.fl_flags |= FL_FILE_PVT;
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file_lock.fl_flags |= FL_OFDLCK;
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file_lock.fl_owner = (fl_owner_t)filp;
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}
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/*
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* If the cmd is requesting file-private locks, then set the
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* FL_FILE_PVT flag and override the owner.
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* FL_OFDLCK flag and override the owner.
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*/
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switch (cmd) {
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case F_SETLKP:
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case F_OFD_SETLK:
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error = -EINVAL;
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if (flock.l_pid != 0)
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goto out;
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cmd = F_SETLK;
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file_lock->fl_flags |= FL_FILE_PVT;
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file_lock->fl_flags |= FL_OFDLCK;
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file_lock->fl_owner = (fl_owner_t)filp;
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break;
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case F_SETLKPW:
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case F_OFD_SETLKW:
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error = -EINVAL;
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if (flock.l_pid != 0)
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goto out;
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cmd = F_SETLKW;
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file_lock->fl_flags |= FL_FILE_PVT;
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file_lock->fl_flags |= FL_OFDLCK;
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file_lock->fl_owner = (fl_owner_t)filp;
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/* Fallthrough */
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case F_SETLKW:
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if (error)
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goto out;
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if (cmd == F_GETLKP) {
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if (cmd == F_OFD_GETLK) {
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error = -EINVAL;
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if (flock.l_pid != 0)
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goto out;
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cmd = F_GETLK64;
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file_lock.fl_flags |= FL_FILE_PVT;
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file_lock.fl_flags |= FL_OFDLCK;
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file_lock.fl_owner = (fl_owner_t)filp;
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}
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/*
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* If the cmd is requesting file-private locks, then set the
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* FL_FILE_PVT flag and override the owner.
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* FL_OFDLCK flag and override the owner.
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*/
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switch (cmd) {
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case F_SETLKP:
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case F_OFD_SETLK:
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error = -EINVAL;
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if (flock.l_pid != 0)
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goto out;
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cmd = F_SETLK64;
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file_lock->fl_flags |= FL_FILE_PVT;
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file_lock->fl_flags |= FL_OFDLCK;
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file_lock->fl_owner = (fl_owner_t)filp;
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break;
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case F_SETLKPW:
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case F_OFD_SETLKW:
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error = -EINVAL;
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if (flock.l_pid != 0)
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goto out;
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cmd = F_SETLKW64;
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file_lock->fl_flags |= FL_FILE_PVT;
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file_lock->fl_flags |= FL_OFDLCK;
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file_lock->fl_owner = (fl_owner_t)filp;
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/* Fallthrough */
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case F_SETLKW64:
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@ -2412,8 +2412,8 @@ static void lock_get_status(struct seq_file *f, struct file_lock *fl,
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if (IS_POSIX(fl)) {
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if (fl->fl_flags & FL_ACCESS)
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seq_printf(f, "ACCESS");
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else if (IS_FILE_PVT(fl))
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seq_printf(f, "FLPVT ");
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else if (IS_OFDLCK(fl))
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seq_printf(f, "OFDLCK");
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else
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seq_printf(f, "POSIX ");
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@ -815,7 +815,7 @@ static inline struct file *get_file(struct file *f)
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#define FL_SLEEP 128 /* A blocking lock */
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#define FL_DOWNGRADE_PENDING 256 /* Lease is being downgraded */
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#define FL_UNLOCK_PENDING 512 /* Lease is being broken */
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#define FL_FILE_PVT 1024 /* lock is private to the file */
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#define FL_OFDLCK 1024 /* lock is "owned" by struct file */
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/*
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* Special return value from posix_lock_file() and vfs_lock_file() for
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@ -133,20 +133,20 @@
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#endif
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/*
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* fd "private" POSIX locks.
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* Open File Description Locks
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*
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* Usually POSIX locks held by a process are released on *any* close and are
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* Usually record locks held by a process are released on *any* close and are
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* not inherited across a fork().
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*
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* These cmd values will set locks that conflict with normal POSIX locks, but
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* are "owned" by the opened file, not the process. This means that they are
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* inherited across fork() like BSD (flock) locks, and they are only released
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* automatically when the last reference to the the open file against which
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* they were acquired is put.
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* These cmd values will set locks that conflict with process-associated
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* record locks, but are "owned" by the open file description, not the
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* process. This means that they are inherited across fork() like BSD (flock)
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* locks, and they are only released automatically when the last reference to
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* the the open file against which they were acquired is put.
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*/
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#define F_GETLKP 36
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#define F_SETLKP 37
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#define F_SETLKPW 38
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#define F_OFD_GETLK 36
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#define F_OFD_SETLK 37
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#define F_OFD_SETLKW 38
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#define F_OWNER_TID 0
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#define F_OWNER_PID 1
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@ -3317,9 +3317,9 @@ static int selinux_file_fcntl(struct file *file, unsigned int cmd,
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case F_GETLK:
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case F_SETLK:
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case F_SETLKW:
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case F_GETLKP:
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case F_SETLKP:
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case F_SETLKPW:
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case F_OFD_GETLK:
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case F_OFD_SETLK:
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case F_OFD_SETLKW:
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#if BITS_PER_LONG == 32
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case F_GETLK64:
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case F_SETLK64:
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