Re: [PATCH 3/3] refs.c: remove lock_fd from struct ref_lock
- From
Junio C Hamano <gitster@pobox.com>
- Date
- Apr 14, 2015, 23:12 UTC
- Message-ID
- <xmqq8udu1f0c.fsf@gitster.dls.corp.google.com>
- In-Reply-To
- <1429050308-9617-4-git-send-email-sbeller@google.com>
Stefan Beller <sbeller@google.com> writes:
Show 6 quoted lines
> The 'lock_fd' is the same as 'lk->fd'. No need to store it twice so remove > it. You may argue this introduces more coupling as we need to know more > about the internals of the lock file mechanism, but this will be solved in > a later patch. > > No functional changes intended.
It is somewhat strange to hear "in a later patch" in [PATCH 3/3] of a 3-patch series ;-), but I think this makes sense. Whenever we take a ref-lock, and we are going to actually write something into the filesystem, we would go thru the lock_file API, so we can depend on lk to have its own file descriptor field.
Show 77 quoted lines
>
> Signed-off-by: Stefan Beller <sbeller@google.com>
> Signed-off-by: Junio C Hamano <gitster@pobox.com>
> ---
> refs.c | 16 ++++++----------
> 1 file changed, 6 insertions(+), 10 deletions(-)
>
> diff --git a/refs.c b/refs.c
> index 14e52ca..4066752 100644
> --- a/refs.c
> +++ b/refs.c
> @@ -11,7 +11,6 @@ struct ref_lock {
> char *orig_ref_name;
> struct lock_file *lk;
> unsigned char old_sha1[20];
> - int lock_fd;
> int force_write;
> };
>
> @@ -2259,7 +2258,6 @@ static struct ref_lock *lock_ref_sha1_basic(const char *refname,
> int attempts_remaining = 3;
>
> lock = xcalloc(1, sizeof(struct ref_lock));
> - lock->lock_fd = -1;
>
> if (mustexist)
> resolve_flags |= RESOLVE_REF_READING;
> @@ -2335,8 +2333,8 @@ static struct ref_lock *lock_ref_sha1_basic(const char *refname,
> goto error_return;
> }
>
> - lock->lock_fd = hold_lock_file_for_update(lock->lk, ref_file, lflags);
> - if (lock->lock_fd < 0) {
> + if (hold_lock_file_for_update(lock->lk, ref_file, lflags) < 0) {
> + last_errno = errno;
> if (errno == ENOENT && --attempts_remaining > 0)
> /*
> * Maybe somebody just deleted one of the
> @@ -2904,7 +2902,6 @@ static int close_ref(struct ref_lock *lock)
> {
> if (close_lock_file(lock->lk))
> return -1;
> - lock->lock_fd = -1;
> return 0;
> }
>
> @@ -2912,7 +2909,6 @@ static int commit_ref(struct ref_lock *lock)
> {
> if (commit_lock_file(lock->lk))
> return -1;
> - lock->lock_fd = -1;
> return 0;
> }
>
> @@ -3090,8 +3086,8 @@ static int write_ref_sha1(struct ref_lock *lock,
> errno = EINVAL;
> return -1;
> }
> - if (write_in_full(lock->lock_fd, sha1_to_hex(sha1), 40) != 40 ||
> - write_in_full(lock->lock_fd, &term, 1) != 1 ||
> + if (write_in_full(lock->lk->fd, sha1_to_hex(sha1), 40) != 40 ||
> + write_in_full(lock->lk->fd, &term, 1) != 1 ||
> close_ref(lock) < 0) {
> int save_errno = errno;
> error("Couldn't write %s", lock->lk->filename.buf);
> @@ -4047,9 +4043,9 @@ int reflog_expire(const char *refname, const unsigned char *sha1,
> status |= error("couldn't write %s: %s", log_file,
> strerror(errno));
> } else if ((flags & EXPIRE_REFLOGS_UPDATE_REF) &&
> - (write_in_full(lock->lock_fd,
> + (write_in_full(lock->lk->fd,
> sha1_to_hex(cb.last_kept_sha1), 40) != 40 ||
> - write_str_in_full(lock->lock_fd, "\n") != 1 ||
> + write_str_in_full(lock->lk->fd, "\n") != 1 ||
> close_ref(lock) < 0)) {
> status |= error("couldn't write %s",
> lock->lk->filename.buf);