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reftable: honor core.fsync
While the reffiles backend honors configured fsync settings, the reftable backend does not. Address this by fsyncing reftable files using the write-or-die api's fsync_component() in two places: when we add additional entries into the table, and when we close the reftable writer. This commits adds a flush function pointer as a new member of reftable_writer because we are not sure that the first argument to the *write function pointer always contains a file descriptor. In the case of strbuf_add_void, the first argument is a buffer. This way, we can pass in a corresponding flush function that knows how to flush depending on which writer is being used. This patch does not contain tests as they will need to wait for another patch to start to exercise the reftable backend. At that point, the tests will be added to observe that fsyncs are happening when the reftable is in use. Signed-off-by: John Cai <johncai86@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
parent
e02ecfcc53
commit
1df18a1c9a
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@ -42,7 +42,7 @@ static void write_test_table(struct strbuf *buf,
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}
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}
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w = reftable_new_writer(&strbuf_add_void, buf, &opts);
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w = reftable_new_writer(&strbuf_add_void, &noop_flush, buf, &opts);
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reftable_writer_set_limits(w, min, max);
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for (i = 0; i < n; i++) {
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@ -70,7 +70,7 @@ static void write_test_log_table(struct strbuf *buf,
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.exact_log_message = 1,
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};
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struct reftable_writer *w = NULL;
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w = reftable_new_writer(&strbuf_add_void, buf, &opts);
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w = reftable_new_writer(&strbuf_add_void, &noop_flush, buf, &opts);
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reftable_writer_set_limits(w, update_index, update_index);
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for (i = 0; i < n; i++) {
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@ -412,7 +412,7 @@ static void test_default_write_opts(void)
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struct reftable_write_options opts = { 0 };
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struct strbuf buf = STRBUF_INIT;
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struct reftable_writer *w =
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reftable_new_writer(&strbuf_add_void, &buf, &opts);
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reftable_new_writer(&strbuf_add_void, &noop_flush, &buf, &opts);
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struct reftable_ref_record rec = {
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.refname = "master",
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@ -51,7 +51,7 @@ static void write_table(char ***names, struct strbuf *buf, int N,
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.hash_id = hash_id,
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};
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struct reftable_writer *w =
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reftable_new_writer(&strbuf_add_void, buf, &opts);
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reftable_new_writer(&strbuf_add_void, &noop_flush, buf, &opts);
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struct reftable_ref_record ref = { NULL };
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int i = 0, n;
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struct reftable_log_record log = { NULL };
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@ -130,7 +130,7 @@ static void test_log_buffer_size(void)
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.message = "commit: 9\n",
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} } };
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struct reftable_writer *w =
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reftable_new_writer(&strbuf_add_void, &buf, &opts);
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reftable_new_writer(&strbuf_add_void, &noop_flush, &buf, &opts);
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/* This tests buffer extension for log compression. Must use a random
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hash, to ensure that the compressed part is larger than the original.
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@ -171,7 +171,7 @@ static void test_log_overflow(void)
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.message = msg,
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} } };
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struct reftable_writer *w =
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reftable_new_writer(&strbuf_add_void, &buf, &opts);
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reftable_new_writer(&strbuf_add_void, &noop_flush, &buf, &opts);
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uint8_t hash1[GIT_SHA1_RAWSZ] = {1}, hash2[GIT_SHA1_RAWSZ] = { 2 };
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@ -202,7 +202,7 @@ static void test_log_write_read(void)
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struct reftable_block_source source = { NULL };
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struct strbuf buf = STRBUF_INIT;
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struct reftable_writer *w =
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reftable_new_writer(&strbuf_add_void, &buf, &opts);
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reftable_new_writer(&strbuf_add_void, &noop_flush, &buf, &opts);
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const struct reftable_stats *stats = NULL;
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reftable_writer_set_limits(w, 0, N);
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for (i = 0; i < N; i++) {
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@ -294,7 +294,7 @@ static void test_log_zlib_corruption(void)
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struct reftable_block_source source = { 0 };
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struct strbuf buf = STRBUF_INIT;
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struct reftable_writer *w =
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reftable_new_writer(&strbuf_add_void, &buf, &opts);
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reftable_new_writer(&strbuf_add_void, &noop_flush, &buf, &opts);
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const struct reftable_stats *stats = NULL;
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uint8_t hash1[GIT_SHA1_RAWSZ] = { 1 };
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uint8_t hash2[GIT_SHA1_RAWSZ] = { 2 };
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@ -535,7 +535,7 @@ static void test_table_refs_for(int indexed)
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struct strbuf buf = STRBUF_INIT;
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struct reftable_writer *w =
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reftable_new_writer(&strbuf_add_void, &buf, &opts);
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reftable_new_writer(&strbuf_add_void, &noop_flush, &buf, &opts);
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struct reftable_iterator it = { NULL };
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int j;
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@ -628,7 +628,7 @@ static void test_write_empty_table(void)
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struct reftable_write_options opts = { 0 };
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struct strbuf buf = STRBUF_INIT;
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struct reftable_writer *w =
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reftable_new_writer(&strbuf_add_void, &buf, &opts);
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reftable_new_writer(&strbuf_add_void, &noop_flush, &buf, &opts);
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struct reftable_block_source source = { NULL };
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struct reftable_reader *rd = NULL;
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struct reftable_ref_record rec = { NULL };
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@ -666,7 +666,7 @@ static void test_write_object_id_min_length(void)
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};
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struct strbuf buf = STRBUF_INIT;
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struct reftable_writer *w =
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reftable_new_writer(&strbuf_add_void, &buf, &opts);
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reftable_new_writer(&strbuf_add_void, &noop_flush, &buf, &opts);
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struct reftable_ref_record ref = {
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.update_index = 1,
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.value_type = REFTABLE_REF_VAL1,
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@ -701,7 +701,7 @@ static void test_write_object_id_length(void)
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};
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struct strbuf buf = STRBUF_INIT;
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struct reftable_writer *w =
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reftable_new_writer(&strbuf_add_void, &buf, &opts);
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reftable_new_writer(&strbuf_add_void, &noop_flush, &buf, &opts);
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struct reftable_ref_record ref = {
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.update_index = 1,
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.value_type = REFTABLE_REF_VAL1,
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@ -735,7 +735,7 @@ static void test_write_empty_key(void)
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struct reftable_write_options opts = { 0 };
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struct strbuf buf = STRBUF_INIT;
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struct reftable_writer *w =
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reftable_new_writer(&strbuf_add_void, &buf, &opts);
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reftable_new_writer(&strbuf_add_void, &noop_flush, &buf, &opts);
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struct reftable_ref_record ref = {
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.refname = "",
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.update_index = 1,
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@ -758,7 +758,7 @@ static void test_write_key_order(void)
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struct reftable_write_options opts = { 0 };
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struct strbuf buf = STRBUF_INIT;
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struct reftable_writer *w =
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reftable_new_writer(&strbuf_add_void, &buf, &opts);
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reftable_new_writer(&strbuf_add_void, &noop_flush, &buf, &opts);
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struct reftable_ref_record refs[2] = {
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{
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.refname = "b",
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@ -801,7 +801,7 @@ static void test_write_multiple_indices(void)
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struct reftable_reader *reader;
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int err, i;
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writer = reftable_new_writer(&strbuf_add_void, &writer_buf, &opts);
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writer = reftable_new_writer(&strbuf_add_void, &noop_flush, &writer_buf, &opts);
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reftable_writer_set_limits(writer, 1, 1);
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for (i = 0; i < 100; i++) {
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struct reftable_ref_record ref = {
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@ -30,7 +30,7 @@ static void test_conflict(void)
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struct reftable_write_options opts = { 0 };
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struct strbuf buf = STRBUF_INIT;
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struct reftable_writer *w =
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reftable_new_writer(&strbuf_add_void, &buf, &opts);
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reftable_new_writer(&strbuf_add_void, &noop_flush, &buf, &opts);
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struct reftable_ref_record rec = {
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.refname = "a/b",
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.value_type = REFTABLE_REF_SYMREF,
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@ -88,6 +88,7 @@ struct reftable_stats {
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/* reftable_new_writer creates a new writer */
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struct reftable_writer *
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reftable_new_writer(ssize_t (*writer_func)(void *, const void *, size_t),
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int (*flush_func)(void *),
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void *writer_arg, struct reftable_write_options *opts);
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/* Set the range of update indices for the records we will add. When writing a
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@ -8,6 +8,7 @@ license that can be found in the LICENSE file or at
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#include "stack.h"
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#include "../write-or-die.h"
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#include "system.h"
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#include "merged.h"
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#include "reader.h"
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#include "reftable-record.h"
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#include "reftable-merged.h"
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#include "writer.h"
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#include "tempfile.h"
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static int stack_try_add(struct reftable_stack *st,
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return write_in_full(*fdp, data, sz);
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}
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static int reftable_fd_flush(void *arg)
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{
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int *fdp = (int *)arg;
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return fsync_component(FSYNC_COMPONENT_REFERENCE, *fdp);
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}
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int reftable_new_stack(struct reftable_stack **dest, const char *dir,
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struct reftable_write_options config)
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{
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goto done;
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}
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fsync_component_or_die(FSYNC_COMPONENT_REFERENCE, lock_file_fd,
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get_tempfile_path(add->lock_file));
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err = rename_tempfile(&add->lock_file, add->stack->list_file);
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if (err < 0) {
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err = REFTABLE_IO_ERROR;
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goto done;
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}
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}
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wr = reftable_new_writer(reftable_fd_write, &tab_fd,
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wr = reftable_new_writer(reftable_fd_write, reftable_fd_flush, &tab_fd,
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&add->stack->config);
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err = write_table(wr, arg);
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if (err < 0)
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strbuf_addstr(temp_tab, ".temp.XXXXXX");
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tab_fd = mkstemp(temp_tab->buf);
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wr = reftable_new_writer(reftable_fd_write, &tab_fd, &st->config);
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wr = reftable_new_writer(reftable_fd_write, reftable_fd_flush, &tab_fd, &st->config);
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err = stack_write_compact(st, wr, first, last, config);
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if (err < 0)
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strbuf_add(b, data, sz);
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return sz;
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}
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int noop_flush(void *arg)
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{
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return 0;
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}
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@ -56,4 +56,6 @@ void set_test_hash(uint8_t *p, int i);
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*/
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ssize_t strbuf_add_void(void *b, const void *data, size_t sz);
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int noop_flush(void *);
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#endif
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@ -121,6 +121,7 @@ static struct strbuf reftable_empty_strbuf = STRBUF_INIT;
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struct reftable_writer *
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reftable_new_writer(ssize_t (*writer_func)(void *, const void *, size_t),
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int (*flush_func)(void *),
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void *writer_arg, struct reftable_write_options *opts)
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{
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struct reftable_writer *wp =
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wp->write = writer_func;
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wp->write_arg = writer_arg;
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wp->opts = *opts;
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wp->flush = flush_func;
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writer_reinit_block_writer(wp, BLOCK_TYPE_REF);
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return wp;
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put_be32(p, crc32(0, footer, p - footer));
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p += 4;
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err = w->flush(w->write_arg);
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if (err < 0) {
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err = REFTABLE_IO_ERROR;
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goto done;
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}
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err = padded_write(w, footer, footer_size(writer_version(w)), 0);
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if (err < 0)
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goto done;
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@ -16,6 +16,7 @@ license that can be found in the LICENSE file or at
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struct reftable_writer {
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ssize_t (*write)(void *, const void *, size_t);
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int (*flush)(void *);
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void *write_arg;
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int pending_padding;
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struct strbuf last_key;
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