GitHub-Mirror/Star64_linux
2
0
Fork 0
mirror of https://github.com/Fishwaldo/Star64_linux.git synced 2025-06-08 07:38:10 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

locks: fix F_GETLK regression (failure to find conflicts)

Browse source 
In 9d6a8c5c21 we changed posix_test_lock
to modify its single file_lock argument instead of taking separate input
and output arguments.  This makes it no longer safe to set the output
lock's fl_type to F_UNLCK before looking for a conflict, since that
means searching for a conflict against a lock with type F_UNLCK.

This fixes a regression which causes F_GETLK to incorrectly report no
conflict on most filesystems (including any filesystem that doesn't do
its own locking).

Also fix posix_lock_to_flock() to copy the lock type.  This isn't
strictly necessary, since the caller already does this; but it seems
less likely to cause confusion in the future.

Thanks to Doug Chapman for the bug report.

Signed-off-by: "J. Bruce Fields" <bfields@citi.umich.edu>
Acked-by: Doug Chapman <doug.chapman@hp.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
J. Bruce Fields 2007-05-10 18:38:43 -04:00 • committed by Linus Torvalds
parent a9deecba19
commit 129a84de23
1 changed files with 3 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

5
fs/locks.c
View file

@ -669,7 +669,6 @@ posix_test_lock(struct file *filp, struct file_lock *fl)
{ {
struct file_lock *cfl; struct file_lock *cfl;
fl->fl_type = F_UNLCK;
lock_kernel(); lock_kernel();
for (cfl = filp->f_path.dentry->d_inode->i_flock; cfl; cfl = cfl->fl_next) { for (cfl = filp->f_path.dentry->d_inode->i_flock; cfl; cfl = cfl->fl_next) {
if (!IS_POSIX(cfl)) if (!IS_POSIX(cfl))
@ -681,7 +680,8 @@ posix_test_lock(struct file *filp, struct file_lock *fl)
__locks_copy_lock(fl, cfl); __locks_copy_lock(fl, cfl);
unlock_kernel(); unlock_kernel();
return 1; return 1;
} } else
fl->fl_type = F_UNLCK;
unlock_kernel(); unlock_kernel();
return 0; return 0;
} }
@ -1632,6 +1632,7 @@ static int posix_lock_to_flock(struct flock *flock, struct file_lock *fl)
flock->l_len = fl->fl_end == OFFSET_MAX ? 0 : flock->l_len = fl->fl_end == OFFSET_MAX ? 0 :
fl->fl_end - fl->fl_start + 1; fl->fl_end - fl->fl_start + 1;
flock->l_whence = 0; flock->l_whence = 0;
flock->l_type = fl->fl_type;
return 0; return 0;
} }