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| author | Eric W. Biederman <ebiederm@xmission.com> | 2020-11-20 17:14:26 -0600 |
|---|---|---|
| committer | Eric W. Biederman <ebiederm@xmission.com> | 2020-12-10 12:40:03 -0600 |
| commit | f36c2943274199cb8aef32ac96531ffb7c4b43d0 (patch) | |
| tree | 45e9f9d75456064982722d09d85c023e2708db6b /fs/file.c | |
| parent | 120ce2b0cd52abe73e8b16c23461eb14df5a87d8 (diff) | |
| download | linux-f36c2943274199cb8aef32ac96531ffb7c4b43d0.tar.gz | |
file: Replace fcheck_files with files_lookup_fd_rcu
This change renames fcheck_files to files_lookup_fd_rcu. All of the remaining callers take the rcu_read_lock before calling this function so the _rcu suffix is appropriate. This change also tightens up the debug check to verify that all callers hold the rcu_read_lock. All callers that used to call files_check with the files->file_lock held have now been changed to call files_lookup_fd_locked. This change of name has helped remind me of which locks and which guarantees are in place helping me to catch bugs later in the patchset. The need for better names became apparent in the last round of discussion of this set of changes[1]. [1] https://lkml.kernel.org/r/CAHk-=wj8BQbgJFLa+J0e=iT-1qpmCRTbPAJ8gd6MJQ=kbRPqyQ@mail.gmail.com Link: https://lkml.kernel.org/r/20201120231441.29911-9-ebiederm@xmission.com Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Diffstat (limited to 'fs/file.c')
| -rw-r--r-- | fs/file.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/file.c b/fs/file.c index 9d0e91168be1..5861c4f89419 100644 --- a/fs/file.c +++ b/fs/file.c @@ -814,7 +814,7 @@ static struct file *__fget_files(struct files_struct *files, unsigned int fd, rcu_read_lock(); loop: - file = fcheck_files(files, fd); + file = files_lookup_fd_rcu(files, fd); if (file) { /* File object ref couldn't be taken. * dup2() atomicity guarantee is the reason @@ -1127,7 +1127,7 @@ SYSCALL_DEFINE2(dup2, unsigned int, oldfd, unsigned int, newfd) int retval = oldfd; rcu_read_lock(); - if (!fcheck_files(files, oldfd)) + if (!files_lookup_fd_rcu(files, oldfd)) retval = -EBADF; rcu_read_unlock(); return retval; |