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blobfs: make cache_free_buffers() used for file deletion and blobfs unload

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When there is no free cache buffers, we need to free some cache buffers
based on very simple algorithm for now, when deleting a file or unload
the blobfs, there must no dirty caches, there is no cache buffers after
calling spdk_tree_free_buffers(), so we will create another cache free
buffers function which only used in file read/write path.

When testing blobfs with db_bench, there maybe multiple threads will
call alloc_cache_memory_buffer() at same time, and spdk_fs_delete_file_async()
maybe called at same time, and it may release file->tree and file structure
without holding g_caches_lock, so here we will change the
alloc_cache_memory_buffer() to hold the g_caches_lock while releasing
the file cache buffers.

Fix issue #1133.

Change-Id: I115ff97113915630f539c3458c57116d9ff16179
Signed-off-by: Changpeng Liu <changpeng.liu@intel.com>
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/668
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
Reviewed-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>
This commit is contained in:
Changpeng Liu 2020-02-09 02:48:56 -05:00 committed by Tomasz Zawadzki
parent 2505b93862
commit 72b9af55fa
1 changed files with 56 additions and 26 deletions
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82
lib/blobfs/blobfs.c
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@ -1484,6 +1484,10 @@ spdk_fs_delete_file_async(struct spdk_filesystem *fs, const char *name,
TAILQ_REMOVE(&fs->files, f, tailq);
/* It's safe to free cache buffers here while another thread
* is trying to free the same file cache buffers, because each
* thread will get the g_caches_lock first.
*/
cache_free_buffers(f);
blobid = f->blobid;
@ -2012,10 +2016,45 @@ spdk_fs_get_cache_size(void)
static void __file_flush(void *ctx);
/* Try to free some cache buffers of this file, this function must
* be called while holding g_caches_lock.
*/
static void
reclaim_cache_buffers(struct spdk_file *file)
{
int rc;
BLOBFS_TRACE(file, "free=%s\n", file->name);
/* The function is safe to be called with any threads, while the file
* lock maybe locked by other thread for now, so try to get the file
* lock here.
*/
rc = pthread_spin_trylock(&file->lock);
if (rc != 0) {
return;
}
if (file->tree->present_mask == 0) {
pthread_spin_unlock(&file->lock);
return;
}
spdk_tree_free_buffers(file->tree);
TAILQ_REMOVE(&g_caches, file, cache_tailq);
/* If not freed, put it in the end of the queue */
if (file->tree->present_mask != 0) {
TAILQ_INSERT_TAIL(&g_caches, file, cache_tailq);
} else {
file->last = NULL;
}
pthread_spin_unlock(&file->lock);
}
static void *
alloc_cache_memory_buffer(struct spdk_file *context)
{
struct spdk_file *file;
struct spdk_file *file, *tmp;
void *buf;
buf = spdk_mempool_get(g_cache_pool);
@ -2024,51 +2063,45 @@ alloc_cache_memory_buffer(struct spdk_file *context)
}
pthread_spin_lock(&g_caches_lock);
TAILQ_FOREACH(file, &g_caches, cache_tailq) {
TAILQ_FOREACH_SAFE(file, &g_caches, cache_tailq, tmp) {
if (!file->open_for_writing &&
file->priority == SPDK_FILE_PRIORITY_LOW &&
file != context) {
break;
reclaim_cache_buffers(file);
}
}
pthread_spin_unlock(&g_caches_lock);
if (file != NULL) {
cache_free_buffers(file);
buf = spdk_mempool_get(g_cache_pool);
if (buf != NULL) {
pthread_spin_unlock(&g_caches_lock);
return buf;
}
break;
}
pthread_spin_lock(&g_caches_lock);
TAILQ_FOREACH(file, &g_caches, cache_tailq) {
if (!file->open_for_writing && file != context) {
break;
TAILQ_FOREACH_SAFE(file, &g_caches, cache_tailq, tmp) {
if (!file->open_for_writing &&
file != context) {
reclaim_cache_buffers(file);
}
}
pthread_spin_unlock(&g_caches_lock);
if (file != NULL) {
cache_free_buffers(file);
buf = spdk_mempool_get(g_cache_pool);
if (buf != NULL) {
pthread_spin_unlock(&g_caches_lock);
return buf;
}
break;
}
pthread_spin_lock(&g_caches_lock);
TAILQ_FOREACH(file, &g_caches, cache_tailq) {
TAILQ_FOREACH_SAFE(file, &g_caches, cache_tailq, tmp) {
if (file != context) {
break;
reclaim_cache_buffers(file);
}
}
pthread_spin_unlock(&g_caches_lock);
if (file != NULL) {
cache_free_buffers(file);
buf = spdk_mempool_get(g_cache_pool);
if (buf != NULL) {
pthread_spin_unlock(&g_caches_lock);
return buf;
}
break;
}
pthread_spin_unlock(&g_caches_lock);
return NULL;
}
@ -2880,10 +2913,7 @@ cache_free_buffers(struct spdk_file *file)
spdk_tree_free_buffers(file->tree);
TAILQ_REMOVE(&g_caches, file, cache_tailq);
/* If not freed, put it in the end of the queue */
if (file->tree->present_mask != 0) {
TAILQ_INSERT_TAIL(&g_caches, file, cache_tailq);
}
assert(file->tree->present_mask == 0);
file->last = NULL;
pthread_spin_unlock(&g_caches_lock);
pthread_spin_unlock(&file->lock);