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re
read_packed_refs(): use mmap to read the `packed-refs` file
author
Michael Haggerty
<mhagger@alum.mit.edu>
Wed, 13 Sep 2017 17:15:59 +0000
(19:15 +0200)
committer
Junio C Hamano
<gitster@pobox.com>
Thu, 14 Sep 2017 06:19:07 +0000
(15:19 +0900)
It's still done in a pretty stupid way, involving more data copying
than necessary. That will improve in future commits.
Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
refs/packed-backend.c
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diff --git
a/refs/packed-backend.c
b/refs/packed-backend.c
index 5c50c223ef9d997ac5f4e27a8adacf7cca60f05f..154abbd83a5d9e0d54cef8b1f9e7479da0c6d456 100644
(file)
--- a/
refs/packed-backend.c
+++ b/
refs/packed-backend.c
@@
-215,8
+215,12
@@
static NORETURN void die_invalid_line(const char *path,
*/
static struct packed_ref_cache *read_packed_refs(struct packed_ref_store *refs)
{
*/
static struct packed_ref_cache *read_packed_refs(struct packed_ref_store *refs)
{
- FILE *f;
struct packed_ref_cache *packed_refs = xcalloc(1, sizeof(*packed_refs));
struct packed_ref_cache *packed_refs = xcalloc(1, sizeof(*packed_refs));
+ int fd;
+ struct stat st;
+ size_t size;
+ char *buf;
+ const char *pos, *eol, *eof;
struct ref_entry *last = NULL;
struct strbuf line = STRBUF_INIT;
enum { PEELED_NONE, PEELED_TAGS, PEELED_FULLY } peeled = PEELED_NONE;
struct ref_entry *last = NULL;
struct strbuf line = STRBUF_INIT;
enum { PEELED_NONE, PEELED_TAGS, PEELED_FULLY } peeled = PEELED_NONE;
@@
-227,8
+231,8
@@
static struct packed_ref_cache *read_packed_refs(struct packed_ref_store *refs)
packed_refs->cache = create_ref_cache(NULL, NULL);
packed_refs->cache->root->flag &= ~REF_INCOMPLETE;
packed_refs->cache = create_ref_cache(NULL, NULL);
packed_refs->cache->root->flag &= ~REF_INCOMPLETE;
- f
= fopen(refs->path, "r"
);
- if (
!f
) {
+ f
d = open(refs->path, O_RDONLY
);
+ if (
fd < 0
) {
if (errno == ENOENT) {
/*
* This is OK; it just means that no
if (errno == ENOENT) {
/*
* This is OK; it just means that no
@@
-241,16
+245,27
@@
static struct packed_ref_cache *read_packed_refs(struct packed_ref_store *refs)
}
}
}
}
- stat_validity_update(&packed_refs->validity, fileno(f));
+ stat_validity_update(&packed_refs->validity, fd);
+
+ if (fstat(fd, &st) < 0)
+ die_errno("couldn't stat %s", refs->path);
+
+ size = xsize_t(st.st_size);
+ buf = xmmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0);
+ pos = buf;
+ eof = buf + size;
dir = get_ref_dir(packed_refs->cache->root);
dir = get_ref_dir(packed_refs->cache->root);
- while (
strbuf_getwholeline(&line, f, '\n') != EOF
) {
+ while (
pos < eof
) {
struct object_id oid;
const char *refname;
const char *traits;
struct object_id oid;
const char *refname;
const char *traits;
- if (!line.len || line.buf[line.len - 1] != '\n')
- die_unterminated_line(refs->path, line.buf, line.len);
+ eol = memchr(pos, '\n', eof - pos);
+ if (!eol)
+ die_unterminated_line(refs->path, pos, eof - pos);
+
+ strbuf_add(&line, pos, eol + 1 - pos);
if (skip_prefix(line.buf, "# pack-refs with:", &traits)) {
if (strstr(traits, " fully-peeled "))
if (skip_prefix(line.buf, "# pack-refs with:", &traits)) {
if (strstr(traits, " fully-peeled "))
@@
-258,7
+273,7
@@
static struct packed_ref_cache *read_packed_refs(struct packed_ref_store *refs)
else if (strstr(traits, " peeled "))
peeled = PEELED_TAGS;
/* perhaps other traits later as well */
else if (strstr(traits, " peeled "))
peeled = PEELED_TAGS;
/* perhaps other traits later as well */
-
continu
e;
+
goto next_lin
e;
}
refname = parse_ref_line(&line, &oid);
}
refname = parse_ref_line(&line, &oid);
@@
-291,11
+306,18
@@
static struct packed_ref_cache *read_packed_refs(struct packed_ref_store *refs)
} else {
die_invalid_line(refs->path, line.buf, line.len);
}
} else {
die_invalid_line(refs->path, line.buf, line.len);
}
+
+ next_line:
+ /* The "+ 1" is for the LF character. */
+ pos = eol + 1;
+ strbuf_reset(&line);
}
}
- fclose(f);
- strbuf_release(&line);
+ if (munmap(buf, size))
+ die_errno("error ummapping packed-refs file");
+ close(fd);
+ strbuf_release(&line);
return packed_refs;
}
return packed_refs;
}