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files_ref_store: put the packed files lock directly in this struct 

Instead of using a global `lock_file` instance for the main
"packed-refs" file and using a pointer in `files_ref_store` to keep
track of whether it is locked, embed the `lock_file` instance directly
in the `files_ref_store` struct and use the new
`is_lock_file_locked()` function to keep track of whether it is
locked. This keeps related data together and makes the main reference
store less of a special case.

Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
maint
Michael Haggerty 2017-05-22 16:17:41 +02:00 committed by Junio C Hamano
parent 55c6bc37c9
commit 00d174489e
1 changed files with 11 additions and 18 deletions
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29
refs/files-backend.c
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@ -63,16 +63,12 @@ struct files_ref_store {
struct packed_ref_cache *packed;

/*
* Iff the packed-refs file associated with this instance is
* currently locked for writing, this points at the associated
* lock (which is owned by somebody else).
* Lock used for the "packed-refs" file. Note that this (and
* thus the enclosing `files_ref_store`) must not be freed.
*/
struct lock_file *packed_refs_lock;
struct lock_file packed_refs_lock;
};

/* Lock used for the main packed-refs file: */
static struct lock_file packlock;

/*
* Increment the reference count of *packed_refs.
*/
@ -102,7 +98,7 @@ static void clear_packed_ref_cache(struct files_ref_store *refs)
if (refs->packed) {
struct packed_ref_cache *packed_refs = refs->packed;

if (refs->packed_refs_lock)
if (is_lock_file_locked(&refs->packed_refs_lock))
die("BUG: packed-ref cache cleared while locked");
refs->packed = NULL;
release_packed_ref_cache(packed_refs);
@ -394,7 +390,7 @@ static void add_packed_ref(struct files_ref_store *refs,
{
struct packed_ref_cache *packed_ref_cache = get_packed_ref_cache(refs);

if (!refs->packed_refs_lock)
if (!is_lock_file_locked(&refs->packed_refs_lock))
die("BUG: packed refs not locked");
add_ref_entry(get_packed_ref_dir(packed_ref_cache),
create_ref_entry(refname, oid, REF_ISPACKED, 1));
@ -1288,7 +1284,7 @@ static int lock_packed_refs(struct files_ref_store *refs, int flags)
}

if (hold_lock_file_for_update_timeout(
&packlock, files_packed_refs_path(refs),
&refs->packed_refs_lock, files_packed_refs_path(refs),
flags, timeout_value) < 0)
return -1;
/*
@ -1298,7 +1294,6 @@ static int lock_packed_refs(struct files_ref_store *refs, int flags)
* the packed-refs file.
*/
packed_ref_cache = get_packed_ref_cache(refs);
refs->packed_refs_lock = &packlock;
/* Increment the reference count to prevent it from being freed: */
acquire_packed_ref_cache(packed_ref_cache);
return 0;
@ -1321,10 +1316,10 @@ static int commit_packed_refs(struct files_ref_store *refs)

files_assert_main_repository(refs, "commit_packed_refs");

if (!refs->packed_refs_lock)
if (!is_lock_file_locked(&refs->packed_refs_lock))
die("BUG: packed-refs not locked");

out = fdopen_lock_file(refs->packed_refs_lock, "w");
out = fdopen_lock_file(&refs->packed_refs_lock, "w");
if (!out)
die_errno("unable to fdopen packed-refs descriptor");

@ -1342,11 +1337,10 @@ static int commit_packed_refs(struct files_ref_store *refs)
if (ok != ITER_DONE)
die("error while iterating over references");

if (commit_lock_file(refs->packed_refs_lock)) {
if (commit_lock_file(&refs->packed_refs_lock)) {
save_errno = errno;
error = -1;
}
refs->packed_refs_lock = NULL;
release_packed_ref_cache(packed_ref_cache);
errno = save_errno;
return error;
@ -1364,10 +1358,9 @@ static void rollback_packed_refs(struct files_ref_store *refs)

files_assert_main_repository(refs, "rollback_packed_refs");

if (!refs->packed_refs_lock)
if (!is_lock_file_locked(&refs->packed_refs_lock))
die("BUG: packed-refs not locked");
rollback_lock_file(refs->packed_refs_lock);
refs->packed_refs_lock = NULL;
rollback_lock_file(&refs->packed_refs_lock);
release_packed_ref_cache(packed_ref_cache);
clear_packed_ref_cache(refs);
}