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authorCsaba Henk <csaba@redhat.com>2018-05-03 10:22:18 +0200
committerAmar Tumballi <amarts@redhat.com>2018-05-04 17:42:12 +0000
commit2ac79ed8048753dfd2494d3a4d3b0e9411673e3a (patch)
tree080da10738f9dade1fcb787d43f333c641dffe04 /glusterfsd/src
parent15866ac9773e89cd9e017e7d3bf8aa01a87edfd8 (diff)
fuse: add support for kernel writeback cache
- Added kernel-writeback-cache command line and xlator option for requesting utilisation of the writeback cache of the kernel in FUSE_INIT (see [1]). - Added attr-times-granularity command line and xlator option via which granularity of the {a,m,c}time in stat (attr) data that we support can be indicated to kernel. This is a means to avoid divergence of the attr times between kernel and userspace that could occur with writeback-cache, while still maintaining maximum time precision the FUSE server is capable of (see [2]). - Handling FATTR_CTIME flag in FUSE_SETATTR that indicates presence of ctime in setattr payload. Currently we cannot associate arbitrary ctimes to files on backend, so we just touch them to update their ctimes to current time. Having ctimes in setattr payload is also a side effect of writeback cache (see [3] and [4]). [1]: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=4d99ff8, "fuse: Turn writeback cache on" [2]: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=e27c9d3, "fuse: fuse: add time_gran to INIT_OUT" [3]: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1e18bda, "fuse: add .write_inode" [4]: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ab9e13f, "fuse: allow ctime flushing to userspace" Updates: #435 Change-Id: Id174c8e0c815c4456c35f8c53e41a6a507d91855 Signed-off-by: Csaba Henk <csaba@redhat.com>
Diffstat (limited to 'glusterfsd/src')
-rw-r--r--glusterfsd/src/glusterfsd.c70
-rw-r--r--glusterfsd/src/glusterfsd.h2
2 files changed, 72 insertions, 0 deletions
diff --git a/glusterfsd/src/glusterfsd.c b/glusterfsd/src/glusterfsd.c
index b5b8e4d30a7..3de12bc125f 100644
--- a/glusterfsd/src/glusterfsd.c
+++ b/glusterfsd/src/glusterfsd.c
@@ -256,6 +256,11 @@ static struct argp_option gf_options[] = {
OPTION_ARG_OPTIONAL, "disable/enable fuse event-history"},
{"reader-thread-count", ARGP_READER_THREAD_COUNT_KEY, "INTEGER",
OPTION_ARG_OPTIONAL, "set fuse reader thread count"},
+ {"kernel-writeback-cache", ARGP_KERNEL_WRITEBACK_CACHE_KEY, "BOOL",
+ OPTION_ARG_OPTIONAL, "enable fuse in-kernel writeback cache"},
+ {"attr-times-granularity", ARGP_ATTR_TIMES_GRANULARITY_KEY, "NS",
+ OPTION_ARG_OPTIONAL, "declare supported granularity of file attribute"
+ " times in nanoseconds"},
{0, 0, 0, 0, "Miscellaneous Options:"},
{0, }
};
@@ -617,6 +622,44 @@ set_fuse_mount_options (glusterfs_ctx_t *ctx, dict_t *options)
goto err;
}
}
+ switch (cmd_args->kernel_writeback_cache) {
+ case GF_OPTION_ENABLE:
+ ret = dict_set_static_ptr(options, "kernel-writeback-cache",
+ "on");
+ if (ret < 0) {
+ gf_msg ("glusterfsd", GF_LOG_ERROR, 0, glusterfsd_msg_4,
+ "failed to set dict value for key "
+ "kernel-writeback-cache");
+ goto err;
+ }
+ break;
+ case GF_OPTION_DISABLE:
+ ret = dict_set_static_ptr(options, "kernel-writeback-cache",
+ "off");
+ if (ret < 0) {
+ gf_msg ("glusterfsd", GF_LOG_ERROR, 0, glusterfsd_msg_4,
+ "failed to set dict value for key "
+ "kernel-writeback-cache");
+ goto err;
+ }
+ break;
+ case GF_OPTION_DEFERRED: /* default */
+ default:
+ gf_msg_debug ("glusterfsd", 0, "kernel-writeback-cache mode %d",
+ cmd_args->kernel_writeback_cache);
+ break;
+ }
+ if (cmd_args->attr_times_granularity) {
+ ret = dict_set_uint32 (options, "attr-times-granularity",
+ cmd_args->attr_times_granularity);
+ if (ret < 0) {
+ gf_msg ("glusterfsd", GF_LOG_ERROR, 0, glusterfsd_msg_4,
+ "failed to set dict value for key "
+ "attr-times-granularity");
+ goto err;
+ }
+ }
+
ret = 0;
err:
@@ -1385,6 +1428,32 @@ no_oom_api:
break;
+ case ARGP_KERNEL_WRITEBACK_CACHE_KEY:
+ if (!arg)
+ arg = "yes";
+
+ if (gf_string2boolean (arg, &b) == 0) {
+ cmd_args->kernel_writeback_cache = b;
+
+ break;
+ }
+
+ argp_failure (state, -1, 0,
+ "unknown kernel writeback cache setting \"%s\"", arg);
+ break;
+ case ARGP_ATTR_TIMES_GRANULARITY_KEY:
+ if (gf_string2uint32 (arg, &cmd_args->attr_times_granularity)) {
+ argp_failure (state, -1, 0,
+ "unknown attribute times granularity option %s",
+ arg);
+ } else if (cmd_args->attr_times_granularity > 1000000000) {
+ argp_failure (state, -1, 0,
+ "Invalid attribute times granularity value %s. "
+ "Valid range: [\"0, 1000000000\"]", arg);
+ }
+
+ break;
+
}
return 0;
}
@@ -1690,6 +1759,7 @@ glusterfs_ctx_defaults_init (glusterfs_ctx_t *ctx)
cmd_args->fuse_attribute_timeout = -1;
cmd_args->fuse_entry_timeout = -1;
cmd_args->fopen_keep_cache = GF_OPTION_DEFERRED;
+ cmd_args->kernel_writeback_cache = GF_OPTION_DEFERRED;
if (ctx->mem_acct_enable)
cmd_args->mem_acct = 1;
diff --git a/glusterfsd/src/glusterfsd.h b/glusterfsd/src/glusterfsd.h
index 2a03ec09fa2..496a4d95352 100644
--- a/glusterfsd/src/glusterfsd.h
+++ b/glusterfsd/src/glusterfsd.h
@@ -105,6 +105,8 @@ enum argp_option_keys {
ARGP_PRINT_XLATORDIR_KEY = 183,
ARGP_PRINT_STATEDUMPDIR_KEY = 184,
ARGP_PRINT_LOGDIR_KEY = 185,
+ ARGP_KERNEL_WRITEBACK_CACHE_KEY = 186,
+ ARGP_ATTR_TIMES_GRANULARITY_KEY = 187,
};
struct _gfd_vol_top_priv {