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vvfat: mark various functions as coroutine_fn

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Functions that can do I/O are prime candidates for being coroutine_fns.  Make the
change for those that are themselves called only from coroutine_fns.

In addition, coroutine_fns should do I/O using bdrv_co_*() functions, for
which it is required to hold the BlockDriverState graph lock.  So also nnotate
functions on the I/O path with TSA attributes, making it possible to
switch them to use bdrv_co_*() functions.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20230309084456.304669-2-pbonzini@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Paolo Bonzini 2023-03-09 09:44:48 +01:00 committed by Kevin Wolf
parent aef04fc790
commit eab76d5846
1 changed files with 30 additions and 28 deletions
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48
block/vvfat.c
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@ -1053,7 +1053,7 @@ static BDRVVVFATState *vvv = NULL;
#endif
static int enable_write_target(BlockDriverState *bs, Error **errp);
static int is_consistent(BDRVVVFATState *s);
static int coroutine_fn is_consistent(BDRVVVFATState *s);
static QemuOptsList runtime_opts = {
.name = "vvfat",
@ -1469,8 +1469,8 @@ static void print_mapping(const mapping_t* mapping)
}
#endif
static int vvfat_read(BlockDriverState *bs, int64_t sector_num,
uint8_t *buf, int nb_sectors)
static int coroutine_fn GRAPH_RDLOCK
vvfat_read(BlockDriverState *bs, int64_t sector_num, uint8_t *buf, int nb_sectors)
{
BDRVVVFATState *s = bs->opaque;
int i;
@ -1490,7 +1490,7 @@ static int vvfat_read(BlockDriverState *bs, int64_t sector_num,
DLOG(fprintf(stderr, "sectors %" PRId64 "+%" PRId64
" allocated\n", sector_num,
n >> BDRV_SECTOR_BITS));
if (bdrv_pread(s->qcow, sector_num * BDRV_SECTOR_SIZE, n,
if (bdrv_co_pread(s->qcow, sector_num * BDRV_SECTOR_SIZE, n,
buf + i * 0x200, 0) < 0) {
return -1;
}
@ -1532,7 +1532,7 @@ static int vvfat_read(BlockDriverState *bs, int64_t sector_num,
return 0;
}
static int coroutine_fn
static int coroutine_fn GRAPH_RDLOCK
vvfat_co_preadv(BlockDriverState *bs, int64_t offset, int64_t bytes,
QEMUIOVector *qiov, BdrvRequestFlags flags)
{
@ -1796,8 +1796,8 @@ static inline uint32_t modified_fat_get(BDRVVVFATState* s,
}
}
static inline bool cluster_was_modified(BDRVVVFATState *s,
uint32_t cluster_num)
static inline bool coroutine_fn GRAPH_RDLOCK
cluster_was_modified(BDRVVVFATState *s, uint32_t cluster_num)
{
int was_modified = 0;
int i;
@ -1852,8 +1852,8 @@ typedef enum {
* Further, the files/directories handled by this function are
* assumed to be *not* deleted (and *only* those).
*/
static uint32_t get_cluster_count_for_direntry(BDRVVVFATState* s,
direntry_t* direntry, const char* path)
static uint32_t coroutine_fn GRAPH_RDLOCK
get_cluster_count_for_direntry(BDRVVVFATState* s, direntry_t* direntry, const char* path)
{
/*
* This is a little bit tricky:
@ -1979,7 +1979,7 @@ static uint32_t get_cluster_count_for_direntry(BDRVVVFATState* s,
if (res) {
return -1;
}
res = bdrv_pwrite(s->qcow, offset * BDRV_SECTOR_SIZE,
res = bdrv_co_pwrite(s->qcow, offset * BDRV_SECTOR_SIZE,
BDRV_SECTOR_SIZE, s->cluster_buffer,
0);
if (res < 0) {
@ -2011,8 +2011,8 @@ static uint32_t get_cluster_count_for_direntry(BDRVVVFATState* s,
* It returns 0 upon inconsistency or error, and the number of clusters
* used by the directory, its subdirectories and their files.
*/
static int check_directory_consistency(BDRVVVFATState *s,
int cluster_num, const char* path)
static int coroutine_fn GRAPH_RDLOCK
check_directory_consistency(BDRVVVFATState *s, int cluster_num, const char* path)
{
int ret = 0;
unsigned char* cluster = g_malloc(s->cluster_size);
@ -2138,7 +2138,8 @@ DLOG(fprintf(stderr, "check direntry %d:\n", i); print_direntry(direntries + i))
}
/* returns 1 on success */
static int is_consistent(BDRVVVFATState* s)
static int coroutine_fn GRAPH_RDLOCK
is_consistent(BDRVVVFATState* s)
{
int i, check;
int used_clusters_count = 0;
@ -2414,8 +2415,8 @@ static int commit_mappings(BDRVVVFATState* s,
return 0;
}
static int commit_direntries(BDRVVVFATState* s,
int dir_index, int parent_mapping_index)
static int coroutine_fn GRAPH_RDLOCK
commit_direntries(BDRVVVFATState* s, int dir_index, int parent_mapping_index)
{
direntry_t* direntry = array_get(&(s->directory), dir_index);
uint32_t first_cluster = dir_index == 0 ? 0 : begin_of_direntry(direntry);
@ -2504,8 +2505,8 @@ static int commit_direntries(BDRVVVFATState* s,
/* commit one file (adjust contents, adjust mapping),
return first_mapping_index */
static int commit_one_file(BDRVVVFATState* s,
int dir_index, uint32_t offset)
static int coroutine_fn GRAPH_RDLOCK
commit_one_file(BDRVVVFATState* s, int dir_index, uint32_t offset)
{
direntry_t* direntry = array_get(&(s->directory), dir_index);
uint32_t c = begin_of_direntry(direntry);
@ -2770,7 +2771,7 @@ static int handle_renames_and_mkdirs(BDRVVVFATState* s)
/*
* TODO: make sure that the short name is not matching *another* file
*/
static int handle_commits(BDRVVVFATState* s)
static int coroutine_fn GRAPH_RDLOCK handle_commits(BDRVVVFATState* s)
{
int i, fail = 0;
@ -2913,7 +2914,7 @@ static int handle_deletes(BDRVVVFATState* s)
* - recurse direntries from root (using bs->bdrv_pread)
* - delete files corresponding to mappings marked as deleted
*/
static int do_commit(BDRVVVFATState* s)
static int coroutine_fn GRAPH_RDLOCK do_commit(BDRVVVFATState* s)
{
int ret = 0;
@ -2963,7 +2964,7 @@ DLOG(checkpoint());
return 0;
}
static int try_commit(BDRVVVFATState* s)
static int coroutine_fn GRAPH_RDLOCK try_commit(BDRVVVFATState* s)
{
vvfat_close_current_file(s);
DLOG(checkpoint());
@ -2972,7 +2973,8 @@ DLOG(checkpoint());
return do_commit(s);
}
static int vvfat_write(BlockDriverState *bs, int64_t sector_num,
static int coroutine_fn GRAPH_RDLOCK
vvfat_write(BlockDriverState *bs, int64_t sector_num,
const uint8_t *buf, int nb_sectors)
{
BDRVVVFATState *s = bs->opaque;
@ -3082,7 +3084,7 @@ DLOG(checkpoint());
* Use qcow backend. Commit later.
*/
DLOG(fprintf(stderr, "Write to qcow backend: %d + %d\n", (int)sector_num, nb_sectors));
ret = bdrv_pwrite(s->qcow, sector_num * BDRV_SECTOR_SIZE,
ret = bdrv_co_pwrite(s->qcow, sector_num * BDRV_SECTOR_SIZE,
nb_sectors * BDRV_SECTOR_SIZE, buf, 0);
if (ret < 0) {
fprintf(stderr, "Error writing to qcow backend\n");
@ -3103,7 +3105,7 @@ DLOG(checkpoint());
return 0;
}
static int coroutine_fn
static int coroutine_fn GRAPH_RDLOCK
vvfat_co_pwritev(BlockDriverState *bs, int64_t offset, int64_t bytes,
QEMUIOVector *qiov, BdrvRequestFlags flags)
{