Commit 4c81b03e authored by Linus Torvalds's avatar Linus Torvalds Committed by Junio C Hamano

Make pack creation always fsync() the result

This means that we can depend on packs always being stable on disk,
simplifying a lot of the object serialization worries.  And unlike loose
objects, serializing pack creation IO isn't going to be a performance
killer.
Signed-off-by: default avatarLinus Torvalds <[email protected]>
Signed-off-by: default avatarJunio C Hamano <[email protected]>
parent d2b3691b
......@@ -515,10 +515,12 @@ static void write_pack_file(void)
* If so, rewrite it like in fast-import
*/
if (pack_to_stdout || nr_written == nr_remaining) {
sha1close(f, sha1, 1);
unsigned flags = pack_to_stdout ? CSUM_CLOSE : CSUM_FSYNC;
sha1close(f, sha1, flags);
} else {
int fd = sha1close(f, NULL, 0);
fixup_pack_header_footer(fd, sha1, pack_tmp_name, nr_written);
fsync_or_die(fd, pack_tmp_name);
close(fd);
}
......
......@@ -761,6 +761,7 @@ extern ssize_t write_in_full(int fd, const void *buf, size_t count);
extern void write_or_die(int fd, const void *buf, size_t count);
extern int write_or_whine(int fd, const void *buf, size_t count, const char *msg);
extern int write_or_whine_pipe(int fd, const void *buf, size_t count, const char *msg);
extern void fsync_or_die(int fd, const char *);
/* pager.c */
extern void setup_pager(void);
......
......@@ -32,21 +32,24 @@ static void sha1flush(struct sha1file *f, unsigned int count)
}
}
int sha1close(struct sha1file *f, unsigned char *result, int final)
int sha1close(struct sha1file *f, unsigned char *result, unsigned int flags)
{
int fd;
unsigned offset = f->offset;
if (offset) {
SHA1_Update(&f->ctx, f->buffer, offset);
sha1flush(f, offset);
f->offset = 0;
}
if (final) {
if (flags & (CSUM_CLOSE | CSUM_FSYNC)) {
/* write checksum and close fd */
SHA1_Final(f->buffer, &f->ctx);
if (result)
hashcpy(result, f->buffer);
sha1flush(f, 20);
if (flags & CSUM_FSYNC)
fsync_or_die(f->fd, f->name);
if (close(f->fd))
die("%s: sha1 file error on close (%s)",
f->name, strerror(errno));
......
......@@ -16,9 +16,13 @@ struct sha1file {
unsigned char buffer[8192];
};
/* sha1close flags */
#define CSUM_CLOSE 1
#define CSUM_FSYNC 2
extern struct sha1file *sha1fd(int fd, const char *name);
extern struct sha1file *sha1fd_throughput(int fd, const char *name, struct progress *tp);
extern int sha1close(struct sha1file *, unsigned char *, int);
extern int sha1close(struct sha1file *, unsigned char *, unsigned int);
extern int sha1write(struct sha1file *, void *, unsigned int);
extern void crc32_begin(struct sha1file *);
extern uint32_t crc32_end(struct sha1file *);
......
......@@ -890,7 +890,7 @@ static char *create_index(void)
SHA1_Update(&ctx, (*c)->sha1, 20);
}
sha1write(f, pack_data->sha1, sizeof(pack_data->sha1));
sha1close(f, NULL, 1);
sha1close(f, NULL, CSUM_FSYNC);
free(idx);
SHA1_Final(pack_data->sha1, &ctx);
return tmpfile;
......
......@@ -694,6 +694,7 @@ static void final(const char *final_pack_name, const char *curr_pack_name,
if (!from_stdin) {
close(input_fd);
} else {
fsync_or_die(output_fd, curr_pack_name);
err = close(output_fd);
if (err)
die("error while closing pack file: %s", strerror(errno));
......
......@@ -139,7 +139,7 @@ char *write_idx_file(char *index_name, struct pack_idx_entry **objects,
}
sha1write(f, sha1, 20);
sha1close(f, NULL, 1);
sha1close(f, NULL, CSUM_FSYNC);
SHA1_Final(sha1, &ctx);
return index_name;
}
......
......@@ -78,6 +78,13 @@ ssize_t write_in_full(int fd, const void *buf, size_t count)
return total;
}
void fsync_or_die(int fd, const char *msg)
{
if (fsync(fd) < 0) {
die("%s: fsync error (%s)", msg, strerror(errno));
}
}
void write_or_die(int fd, const void *buf, size_t count)
{
if (write_in_full(fd, buf, count) < 0) {
......
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