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authorLinus Torvalds <torvalds@linux-foundation.org>2014-04-04 14:21:20 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2014-04-04 14:21:20 -0700
commitf7789dc0d476e597b0fba52871e777f97d8e3f6e (patch)
treea2f77a68f4339c62ef3db227268db2dd56f83a64 /fs/compat.c
parent7df934526c0b3775613502dcd19ab6d2da8cce1e (diff)
parent29723adee11804b548903ddb1db666cf4a60f60e (diff)
Merge branch 'locks-3.15' of git://git.samba.org/jlayton/linux
Pull file locking updates from Jeff Layton: "Highlights: - maintainership change for fs/locks.c. Willy's not interested in maintaining it these days, and is OK with Bruce and I taking it. - fix for open vs setlease race that Al ID'ed - cleanup and consolidation of file locking code - eliminate unneeded BUG() call - merge of file-private lock implementation" * 'locks-3.15' of git://git.samba.org/jlayton/linux: locks: make locks_mandatory_area check for file-private locks locks: fix locks_mandatory_locked to respect file-private locks locks: require that flock->l_pid be set to 0 for file-private locks locks: add new fcntl cmd values for handling file private locks locks: skip deadlock detection on FL_FILE_PVT locks locks: pass the cmd value to fcntl_getlk/getlk64 locks: report l_pid as -1 for FL_FILE_PVT locks locks: make /proc/locks show IS_FILE_PVT locks as type "FLPVT" locks: rename locks_remove_flock to locks_remove_file locks: consolidate checks for compatible filp->f_mode values in setlk handlers locks: fix posix lock range overflow handling locks: eliminate BUG() call when there's an unexpected lock on file close locks: add __acquires and __releases annotations to locks_start and locks_stop locks: remove "inline" qualifier from fl_link manipulation functions locks: clean up comment typo locks: close potential race between setlease and open MAINTAINERS: update entry for fs/locks.c
Diffstat (limited to 'fs/compat.c')
-rw-r--r--fs/compat.c35
1 files changed, 30 insertions, 5 deletions
diff --git a/fs/compat.c b/fs/compat.c
index f86df85dff61..ca926ad0430c 100644
--- a/fs/compat.c
+++ b/fs/compat.c
@@ -399,12 +399,28 @@ static int put_compat_flock64(struct flock *kfl, struct compat_flock64 __user *u
}
#endif
+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;
+}
+
COMPAT_SYSCALL_DEFINE3(fcntl64, unsigned int, fd, unsigned int, cmd,
compat_ulong_t, arg)
{
mm_segment_t old_fs;
struct flock f;
long ret;
+ unsigned int conv_cmd;
switch (cmd) {
case F_GETLK:
@@ -441,16 +457,18 @@ 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:
ret = get_compat_flock64(&f, compat_ptr(arg));
if (ret != 0)
break;
old_fs = get_fs();
set_fs(KERNEL_DS);
- ret = sys_fcntl(fd, (cmd == F_GETLK64) ? F_GETLK :
- ((cmd == F_SETLK64) ? F_SETLK : F_SETLKW),
- (unsigned long)&f);
+ conv_cmd = convert_fcntl_cmd(cmd);
+ ret = sys_fcntl(fd, conv_cmd, (unsigned long)&f);
set_fs(old_fs);
- if (cmd == F_GETLK64 && ret == 0) {
+ if ((conv_cmd == F_GETLK || conv_cmd == F_GETLKP) && ret == 0) {
/* need to return lock information - see above for commentary */
if (f.l_start > COMPAT_LOFF_T_MAX)
ret = -EOVERFLOW;
@@ -471,8 +489,15 @@ COMPAT_SYSCALL_DEFINE3(fcntl64, unsigned int, fd, unsigned int, cmd,
COMPAT_SYSCALL_DEFINE3(fcntl, unsigned int, fd, unsigned int, cmd,
compat_ulong_t, arg)
{
- if ((cmd == F_GETLK64) || (cmd == F_SETLK64) || (cmd == F_SETLKW64))
+ switch (cmd) {
+ case F_GETLK64:
+ case F_SETLK64:
+ case F_SETLKW64:
+ case F_GETLKP:
+ case F_SETLKP:
+ case F_SETLKPW:
return -EINVAL;
+ }
return compat_sys_fcntl64(fd, cmd, arg);
}