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authorAmar Tumballi <amarts@redhat.com>2018-10-16 16:31:49 +0530
committerAmar Tumballi <amarts@redhat.com>2018-12-14 17:34:28 +0000
commitd49b41e817d592c1904b6f01716df6546dad3ebe (patch)
tree12546ad6da0534683cb7bed5b829500ecdfafe93 /xlators/mount
parentfc74ef85e0780e0a265275df00e4d0d4a2d05eab (diff)
fuse: add --lru-limit option
The inode LRU mechanism is moot in fuse xlator (ie. there is no limit for the LRU list), as fuse inodes are referenced from kernel context, and thus they can only be dropped on request of the kernel. This might results in a high number of passive inodes which are useless for the glusterfs client, causing a significant memory overhead. This change tries to remedy this by extending the LRU semantics and allowing to set a finite limit on the fuse inode LRU. A brief history of problem: When gluster's inode table was designed, fuse didn't have any 'invalidate' method, which means, userspace application could never ask kernel to send a 'forget()' fop, instead had to wait for kernel to send it based on kernel's parameters. Inode table remembers the number of times kernel has cached the inode based on the 'nlookup' parameter. And 'nlookup' field is not used by no other entry points (like server-protocol, gfapi etc). Hence the inode_table of fuse module always has to have lru-limit as '0', which means no limit. GlusterFS always had to keep all inodes in memory as kernel would have had a reference to it. Again, the reason for this is, kernel's glusterfs inode reference was pointer of 'inode_t' structure in glusterfs. As it is a pointer, we could never free it (to prevent segfault, or memory corruption). Solution: In the inode table, handle the prune case of inodes with 'nlookup' differently, and call a 'invalidator' method, which in this case is fuse_invalidate(), and it sends the request to kernel for getting the forget request. When the kernel sends the forget, it means, it has dropped all the reference to the inode, and it will send the forget with the 'nlookup' parameter too. We just need to make sure to reduce the 'nlookup' value we have when we get forget. That automatically cause the relevant prune to happen. Credits: Csaba Henk, Xavier Hernandez, Raghavendra Gowdappa, Nithya B fixes: bz#1560969 Change-Id: Ifee0737b23b12b1426c224ec5b8f591f487d83a2 Signed-off-by: Amar Tumballi <amarts@redhat.com>
Diffstat (limited to 'xlators/mount')
-rw-r--r--xlators/mount/fuse/src/fuse-bridge.c127
-rw-r--r--xlators/mount/fuse/src/fuse-bridge.h3
-rwxr-xr-xxlators/mount/fuse/utils/mount.glusterfs.in7
3 files changed, 86 insertions, 51 deletions
diff --git a/xlators/mount/fuse/src/fuse-bridge.c b/xlators/mount/fuse/src/fuse-bridge.c
index 3f4e19c211e..5bc070658e2 100644
--- a/xlators/mount/fuse/src/fuse-bridge.c
+++ b/xlators/mount/fuse/src/fuse-bridge.c
@@ -216,8 +216,8 @@ check_and_dump_fuse_W(fuse_private_t *priv, struct iovec *iov_out, int count,
struct fuse_out_header *fouh = NULL;
if (res == -1) {
- gf_log("glusterfs-fuse", GF_LOG_ERROR,
- "writing to fuse device failed: %s", strerror(errno));
+ gf_log_callingfn("glusterfs-fuse", GF_LOG_ERROR,
+ "writing to fuse device failed: %s", strerror(errno));
return errno;
}
@@ -312,29 +312,29 @@ send_fuse_data(xlator_t *this, fuse_in_header_t *finh, void *data, size_t size)
#define send_fuse_obj(this, finh, obj) \
send_fuse_data(this, finh, obj, sizeof(*(obj)))
-#if FUSE_KERNEL_MINOR_VERSION >= 11
static void
fuse_invalidate_entry(xlator_t *this, uint64_t fuse_ino)
{
+#if FUSE_KERNEL_MINOR_VERSION >= 11
struct fuse_out_header *fouh = NULL;
struct fuse_notify_inval_entry_out *fnieo = NULL;
fuse_private_t *priv = NULL;
dentry_t *dentry = NULL;
+ dentry_t *tmp = NULL;
inode_t *inode = NULL;
size_t nlen = 0;
fuse_invalidate_node_t *node = NULL;
+ char gfid_str[UUID_CANONICAL_FORM_LEN + 1];
priv = this->private;
-
if (!priv->reverse_fuse_thread_started)
return;
- inode = fuse_ino_to_inode(fuse_ino, this);
- if (inode == NULL) {
+ inode = (inode_t *)(unsigned long)fuse_ino;
+ if (inode == NULL)
return;
- }
- list_for_each_entry(dentry, &inode->dentry_list, inode_list)
+ list_for_each_entry_safe(dentry, tmp, &inode->dentry_list, inode_list)
{
node = GF_CALLOC(1, sizeof(*node), gf_fuse_mt_invalidate_node_t);
if (node == NULL)
@@ -348,38 +348,41 @@ fuse_invalidate_entry(xlator_t *this, uint64_t fuse_ino)
fouh->unique = 0;
fouh->error = FUSE_NOTIFY_INVAL_ENTRY;
- nlen = strlen(dentry->name);
- fouh->len = sizeof(*fouh) + sizeof(*fnieo) + nlen + 1;
- fnieo->parent = inode_to_fuse_nodeid(dentry->parent);
-
- fnieo->namelen = nlen;
- strcpy(node->inval_buf + sizeof(*fouh) + sizeof(*fnieo), dentry->name);
+ if (dentry->name) {
+ nlen = strlen(dentry->name);
+ fouh->len = sizeof(*fouh) + sizeof(*fnieo) + nlen + 1;
+ fnieo->parent = inode_to_fuse_nodeid(dentry->parent);
- pthread_mutex_lock(&priv->invalidate_mutex);
- {
- list_add_tail(&node->next, &priv->invalidate_list);
- pthread_cond_signal(&priv->invalidate_cond);
+ fnieo->namelen = nlen;
+ strcpy((node->inval_buf + sizeof(*fouh) + sizeof(*fnieo)),
+ dentry->name);
}
- pthread_mutex_unlock(&priv->invalidate_mutex);
gf_log("glusterfs-fuse", GF_LOG_TRACE,
- "INVALIDATE entry: "
- "%" PRIu64 "/%s",
- fnieo->parent, dentry->name);
+ "INVALIDATE entry: %" PRIu64 "/%s (gfid:%s)", fnieo->parent,
+ dentry->name, uuid_utoa(inode->gfid));
if (dentry->parent) {
- fuse_log_eh(this, "Invalidated entry %s (parent: %s)", dentry->name,
- uuid_utoa(dentry->parent->gfid));
+ fuse_log_eh(this, "Invalidated entry %s (parent: %s) gfid:%s",
+ dentry->name, uuid_utoa(dentry->parent->gfid),
+ uuid_utoa_r(inode->gfid, gfid_str));
} else {
- fuse_log_eh(this, "Invalidated entry %s(nodeid: %" PRIu64 ")",
- dentry->name, fnieo->parent);
+ fuse_log_eh(this,
+ "Invalidated entry %s(nodeid: %" PRIu64 ") gfid:%s",
+ dentry->name, fnieo->parent, uuid_utoa(inode->gfid));
+ }
+
+ pthread_mutex_lock(&priv->invalidate_mutex);
+ {
+ list_add_tail(&node->next, &priv->invalidate_list);
+ pthread_cond_signal(&priv->invalidate_cond);
}
+ pthread_mutex_unlock(&priv->invalidate_mutex);
}
- if (inode)
- inode_unref(inode);
-}
#endif
+ return;
+}
/*
* Send an inval inode notification to fuse. This causes an invalidation of the
@@ -400,6 +403,10 @@ fuse_invalidate_inode(xlator_t *this, uint64_t fuse_ino)
if (!priv->reverse_fuse_thread_started)
return;
+ inode = (inode_t *)(unsigned long)fuse_ino;
+ if (inode == NULL)
+ return;
+
node = GF_CALLOC(1, sizeof(*node), gf_fuse_mt_invalidate_node_t);
if (node == NULL)
return;
@@ -419,7 +426,11 @@ fuse_invalidate_inode(xlator_t *this, uint64_t fuse_ino)
fniio->off = 0;
fniio->len = -1;
- inode = fuse_ino_to_inode(fuse_ino, this);
+ fuse_log_eh(this, "Invalidated inode %" PRIu64 " (gfid: %s)", fuse_ino,
+ uuid_utoa(inode->gfid));
+ gf_log("glusterfs-fuse", GF_LOG_TRACE,
+ "INVALIDATE inode: %" PRIu64 "(gfid:%s)", fuse_ino,
+ uuid_utoa(inode->gfid));
pthread_mutex_lock(&priv->invalidate_mutex);
{
@@ -428,24 +439,22 @@ fuse_invalidate_inode(xlator_t *this, uint64_t fuse_ino)
}
pthread_mutex_unlock(&priv->invalidate_mutex);
- gf_log("glusterfs-fuse", GF_LOG_TRACE, "INVALIDATE inode: %" PRIu64,
- fuse_ino);
-
- if (inode) {
- fuse_log_eh(this, "Invalidated inode %" PRIu64 " (gfid: %s)", fuse_ino,
- uuid_utoa(inode->gfid));
- } else {
- fuse_log_eh(this, "Invalidated inode %" PRIu64, fuse_ino);
- }
-
- if (inode)
- inode_unref(inode);
#else
gf_log("glusterfs-fuse", GF_LOG_WARNING,
- "fuse_invalidate_inode not implemented on OS X due to missing FUSE "
- "notification");
+ "fuse_invalidate_inode not implemented on this system");
#endif
+ return;
+}
+
+#if FUSE_KERNEL_MINOR_VERSION >= 11
+/* Need this function for the signature (inode_t *, instead of uint64_t) */
+static int32_t
+fuse_inode_invalidate_fn(xlator_t *this, inode_t *inode)
+{
+ fuse_invalidate_entry(this, (uint64_t)inode);
+ return 0;
}
+#endif
static fuse_timed_message_t *
fuse_timed_message_new(void)
@@ -1068,11 +1077,14 @@ do_forget(xlator_t *this, uint64_t unique, uint64_t nodeid, uint64_t nlookup)
{
inode_t *fuse_inode = fuse_ino_to_inode(nodeid, this);
+ gf_log("fuse", GF_LOG_TRACE,
+ "%" PRIu64 ": FORGET %" PRIu64 "/%" PRIu64 " gfid: (%s)", unique,
+ nodeid, nlookup, uuid_utoa(fuse_inode->gfid));
+
fuse_log_eh(this, "%" PRIu64 ": FORGET %" PRIu64 "/%" PRIu64 " gfid: (%s)",
unique, nodeid, nlookup, uuid_utoa(fuse_inode->gfid));
- inode_forget(fuse_inode, nlookup);
- inode_unref(fuse_inode);
+ inode_forget_with_unref(fuse_inode, nlookup);
}
static void
@@ -1087,10 +1099,6 @@ fuse_forget(xlator_t *this, fuse_in_header_t *finh, void *msg,
return;
}
- gf_log("glusterfs-fuse", GF_LOG_TRACE,
- "%" PRIu64 ": FORGET %" PRIu64 "/%" PRIu64, finh->unique,
- finh->nodeid, ffi->nlookup);
-
do_forget(this, finh->unique, finh->nodeid, ffi->nlookup);
GF_FREE(finh);
@@ -5658,7 +5666,9 @@ fuse_thread_proc(void *data)
fuse_in_header_t *finh = NULL;
struct iovec iov_in[2];
void *msg = NULL;
- const size_t msg0_size = sizeof(*finh) + 128;
+ /* we need 512 extra buffer size for BATCH_FORGET fop. By tests, it is
+ found to be reduces 'REALLOC()' in the loop */
+ const size_t msg0_size = sizeof(*finh) + 512;
fuse_handler_t **fuse_ops = NULL;
struct pollfd pfd[2] = {{
0,
@@ -5992,7 +6002,12 @@ fuse_graph_setup(xlator_t *this, glusterfs_graph_t *graph)
goto unlock;
}
+#if FUSE_KERNEL_MINOR_VERSION >= 11
+ itable = inode_table_with_invalidator(priv->lru_limit, graph->top,
+ fuse_inode_invalidate_fn, this);
+#else
itable = inode_table_new(0, graph->top);
+#endif
if (!itable) {
ret = -1;
goto unlock;
@@ -6453,6 +6468,8 @@ init(xlator_t *this_xl)
}
}
+ GF_OPTION_INIT("lru-limit", priv->lru_limit, uint32, cleanup_exit);
+
GF_OPTION_INIT("event-history", priv->event_history, bool, cleanup_exit);
GF_OPTION_INIT("thin-client", priv->thin_client, bool, cleanup_exit);
@@ -6780,6 +6797,14 @@ struct volume_options options[] = {
.description =
"Handle iterrupts in FLUSH handler (for testing purposes).",
},
+ {
+ .key = {"lru-limit"},
+ .type = GF_OPTION_TYPE_INT,
+ .default_value = "131072",
+ .min = 0,
+ .description = "makes glusterfs invalidate kernel inodes after "
+ "reaching this limit (0 means 'unlimited')",
+ },
{.key = {NULL}},
};
diff --git a/xlators/mount/fuse/src/fuse-bridge.h b/xlators/mount/fuse/src/fuse-bridge.h
index 60702ab1da5..b892113eb79 100644
--- a/xlators/mount/fuse/src/fuse-bridge.h
+++ b/xlators/mount/fuse/src/fuse-bridge.h
@@ -187,6 +187,9 @@ struct fuse_private {
pthread_mutex_t interrupt_mutex;
gf_boolean_t flush_handle_interrupt;
+
+ /* LRU Limit, if not set, default is 128k for now */
+ uint32_t lru_limit;
};
typedef struct fuse_private fuse_private_t;
diff --git a/xlators/mount/fuse/utils/mount.glusterfs.in b/xlators/mount/fuse/utils/mount.glusterfs.in
index 4a95cd80b87..d09a7cd663e 100755
--- a/xlators/mount/fuse/utils/mount.glusterfs.in
+++ b/xlators/mount/fuse/utils/mount.glusterfs.in
@@ -249,6 +249,10 @@ start_glusterfs ()
cmd_line=$(echo "$cmd_line --gid-timeout=$gid_timeout");
fi
+ if [ -n "$lru_limit" ]; then
+ cmd_line=$(echo "$cmd_line --lru-limit=$lru_limit");
+ fi
+
if [ -n "$bg_qlen" ]; then
cmd_line=$(echo "$cmd_line --background-qlen=$bg_qlen");
fi
@@ -489,6 +493,9 @@ with_options()
"gid-timeout")
gid_timeout=$value
;;
+ "lru-limit")
+ lru_limit=$value
+ ;;
"background-qlen")
bg_qlen=$value
;;