From bdede85bb9ac8039171857913f6818f327557176 Mon Sep 17 00:00:00 2001
From: Krutika Dhananjay <kdhananj@redhat.com>
Date: Mon, 23 Jan 2017 17:40:40 +0530
Subject: [PATCH 468/473] storage/posix: Execute syscalls in xattrop under
different locks
Backport of: https://review.gluster.org/16462
... and not inode->lock. This is to prevent the epoll thread from
*potentially* being blocked on this lock in the worst case for
extended period elsewhere in the brick stack, while the syscalls
in xattrop are being performed under the same lock by a different
thread. This could potentially lead to ping-timeout, if the only
available epoll thread is busy waiting on the inode->lock, thereby
preventing it from picking up the ping request from the client(s).
Also removed some unused functions.
Change-Id: Ia8acbba6d0afec75b3b49485f234c598cec6571b
BUG: 1415178
Signed-off-by: Krutika Dhananjay <kdhananj@redhat.com>
Reviewed-on: https://code.engineering.redhat.com/gerrit/106796
Reviewed-by: Raghavendra Gowdappa <rgowdapp@redhat.com>
---
xlators/storage/posix/src/posix-handle.c | 8 +--
xlators/storage/posix/src/posix-helpers.c | 85 ++++++++++++++++++++++++-------
xlators/storage/posix/src/posix.c | 36 ++++++++-----
xlators/storage/posix/src/posix.h | 18 ++++++-
4 files changed, 111 insertions(+), 36 deletions(-)
diff --git a/xlators/storage/posix/src/posix-handle.c b/xlators/storage/posix/src/posix-handle.c
index c8524a6..ef56d10 100644
--- a/xlators/storage/posix/src/posix-handle.c
+++ b/xlators/storage/posix/src/posix-handle.c
@@ -952,6 +952,7 @@ posix_create_link_if_gfid_exists (xlator_t *this, uuid_t gfid, char *real_path,
inode_t *inode = NULL;
struct stat stbuf = {0,};
struct posix_private *priv = NULL;
+ posix_inode_ctx_t *ctx = NULL;
priv = this->private;
@@ -973,11 +974,11 @@ posix_create_link_if_gfid_exists (xlator_t *this, uuid_t gfid, char *real_path,
LOCK (&inode->lock);
{
- ret = __inode_ctx_get0 (inode, this, &ctx_int);
+ ret = __posix_inode_ctx_get_all (inode, this, &ctx);
if (ret)
goto unlock;
- if (ctx_int != GF_UNLINK_TRUE)
+ if (ctx->unlink_flag != GF_UNLINK_TRUE)
goto unlock;
POSIX_GET_FILE_UNLINK_PATH (priv->base_path, gfid,
@@ -997,7 +998,8 @@ posix_create_link_if_gfid_exists (xlator_t *this, uuid_t gfid, char *real_path,
goto unlock;
}
ctx_int = GF_UNLINK_FALSE;
- ret = __inode_ctx_set0 (inode, this, &ctx_int);
+ ret = __posix_inode_ctx_set_unlink_flag (inode, this,
+ ctx_int);
}
unlock:
UNLOCK (&inode->lock);
diff --git a/xlators/storage/posix/src/posix-helpers.c b/xlators/storage/posix/src/posix-helpers.c
index 72f76c0..c09cecf 100644
--- a/xlators/storage/posix/src/posix-helpers.c
+++ b/xlators/storage/posix/src/posix-helpers.c
@@ -2270,39 +2270,88 @@ posix_fdget_objectsignature (int fd, dict_t *xattr)
return -EINVAL;
}
+posix_inode_ctx_t *
+__posix_inode_ctx_get (inode_t *inode, xlator_t *this)
+{
+ int ret = -1;
+ uint64_t ctx_uint = 0;
+ posix_inode_ctx_t *ctx_p = NULL;
+
+ ret = __inode_ctx_get (inode, this, &ctx_uint);
+ if (ret == 0) {
+ return (posix_inode_ctx_t *)ctx_uint;
+ }
+
+ ctx_p = GF_CALLOC (1, sizeof (*ctx_p), gf_posix_mt_inode_ctx_t);
+ if (!ctx_p)
+ return NULL;
+
+ pthread_mutex_init (&ctx_p->xattrop_lock, NULL);
+
+ ret = __inode_ctx_set (inode, this, (uint64_t *)&ctx_p);
+ if (ret < 0) {
+ pthread_mutex_destroy (&ctx_p->xattrop_lock);
+ GF_FREE (ctx_p);
+ return NULL;
+ }
+
+ return ctx_p;
+}
int
-posix_inode_ctx_get (inode_t *inode, xlator_t *this, uint64_t *ctx)
+__posix_inode_ctx_set_unlink_flag (inode_t *inode, xlator_t *this, uint64_t ctx)
{
- int ret = -1;
- uint64_t ctx_int = 0;
+ posix_inode_ctx_t *ctx_p = NULL;
- GF_VALIDATE_OR_GOTO (this->name, this, out);
- GF_VALIDATE_OR_GOTO (this->name, inode, out);
+ ctx_p = __posix_inode_ctx_get (inode, this);
+ if (ctx_p == NULL)
+ return -1;
- ret = inode_ctx_get (inode, this, &ctx_int);
+ ctx_p->unlink_flag = ctx;
- if (ret)
- return ret;
+ return 0;
+}
- if (ctx)
- *ctx = ctx_int;
+int
+posix_inode_ctx_set_unlink_flag (inode_t *inode, xlator_t *this, uint64_t ctx)
+{
+ int ret = -1;
+
+ LOCK(&inode->lock);
+ {
+ ret = __posix_inode_ctx_set_unlink_flag (inode, this, ctx);
+ }
+ UNLOCK(&inode->lock);
-out:
return ret;
}
+int
+__posix_inode_ctx_get_all (inode_t *inode, xlator_t *this,
+ posix_inode_ctx_t **ctx)
+{
+ posix_inode_ctx_t *ctx_p = NULL;
+
+ ctx_p = __posix_inode_ctx_get (inode, this);
+ if (ctx_p == NULL)
+ return -1;
+
+ *ctx = ctx_p;
+
+ return 0;
+}
int
-posix_inode_ctx_set (inode_t *inode, xlator_t *this, uint64_t ctx)
+posix_inode_ctx_get_all (inode_t *inode, xlator_t *this,
+ posix_inode_ctx_t **ctx)
{
- int ret = -1;
+ int ret = 0;
- GF_VALIDATE_OR_GOTO (this->name, this, out);
- GF_VALIDATE_OR_GOTO (this->name, inode, out);
- GF_VALIDATE_OR_GOTO (this->name, ctx, out);
+ LOCK(&inode->lock);
+ {
+ ret = __posix_inode_ctx_get_all (inode, this, ctx);
+ }
+ UNLOCK(&inode->lock);
- ret = inode_ctx_set (inode, this, &ctx);
-out:
return ret;
}
diff --git a/xlators/storage/posix/src/posix.c b/xlators/storage/posix/src/posix.c
index afd0ff8..7eaf98b 100644
--- a/xlators/storage/posix/src/posix.c
+++ b/xlators/storage/posix/src/posix.c
@@ -108,19 +108,21 @@ out:
int
posix_forget (xlator_t *this, inode_t *inode)
{
- uint64_t tmp_cache = 0;
- int ret = 0;
- char *unlink_path = NULL;
- struct posix_private *priv_posix = NULL;
+ int ret = 0;
+ char *unlink_path = NULL;
+ uint64_t ctx_uint = 0;
+ posix_inode_ctx_t *ctx = NULL;
+ struct posix_private *priv_posix = NULL;
priv_posix = (struct posix_private *) this->private;
- ret = inode_ctx_del (inode, this, &tmp_cache);
- if (ret < 0) {
- ret = 0;
- goto out;
- }
- if (tmp_cache == GF_UNLINK_TRUE) {
+ ret = inode_ctx_del (inode, this, &ctx_uint);
+ if (!ctx_uint)
+ return 0;
+
+ ctx = (posix_inode_ctx_t *)ctx_uint;
+
+ if (ctx->unlink_flag == GF_UNLINK_TRUE) {
POSIX_GET_FILE_UNLINK_PATH(priv_posix->base_path,
inode->gfid, unlink_path);
if (!unlink_path) {
@@ -134,6 +136,8 @@ posix_forget (xlator_t *this, inode_t *inode)
ret = sys_unlink(unlink_path);
}
out:
+ pthread_mutex_destroy (&ctx->xattrop_lock);
+ GF_FREE (ctx);
return ret;
}
@@ -1696,7 +1700,7 @@ posix_add_unlink_to_ctx (inode_t *inode, xlator_t *this, char *unlink_path)
}
ctx = GF_UNLINK_TRUE;
- ret = posix_inode_ctx_set (inode, this, ctx);
+ ret = posix_inode_ctx_set_unlink_flag (inode, this, ctx);
if (ret < 0) {
goto out;
}
@@ -5426,6 +5430,7 @@ _posix_handle_xattr_keyvalue_pair (dict_t *d, char *k, data_t *v,
inode_t *inode = NULL;
xlator_t *this = NULL;
posix_xattr_filler_t *filler = NULL;
+ posix_inode_ctx_t *ctx = NULL;
filler = tmp;
@@ -5448,8 +5453,13 @@ _posix_handle_xattr_keyvalue_pair (dict_t *d, char *k, data_t *v,
}
}
#endif
+ op_ret = posix_inode_ctx_get_all (inode, this, &ctx);
+ if (op_ret < 0) {
+ op_errno = ENOMEM;
+ goto out;
+ }
- LOCK (&inode->lock);
+ pthread_mutex_lock (&ctx->xattrop_lock);
{
if (filler->real_path) {
size = sys_lgetxattr (filler->real_path, k,
@@ -5558,7 +5568,7 @@ _posix_handle_xattr_keyvalue_pair (dict_t *d, char *k, data_t *v,
op_errno = errno;
}
unlock:
- UNLOCK (&inode->lock);
+ pthread_mutex_unlock (&ctx->xattrop_lock);
if (op_ret == -1)
goto out;
diff --git a/xlators/storage/posix/src/posix.h b/xlators/storage/posix/src/posix.h
index 6fd32c1..fb63004 100644
--- a/xlators/storage/posix/src/posix.h
+++ b/xlators/storage/posix/src/posix.h
@@ -190,6 +190,11 @@ typedef struct {
int32_t op_errno;
} posix_xattr_filler_t;
+typedef struct {
+ uint64_t unlink_flag;
+ pthread_mutex_t xattrop_lock;
+} posix_inode_ctx_t;
+
#define POSIX_BASE_PATH(this) (((struct posix_private *)this->private)->base_path)
#define POSIX_BASE_PATH_LEN(this) (((struct posix_private *)this->private)->base_path_length)
@@ -217,8 +222,17 @@ typedef struct {
/* Helper functions */
-int posix_inode_ctx_get (inode_t *inode, xlator_t *this, uint64_t *ctx);
-int posix_inode_ctx_set (inode_t *inode, xlator_t *this, uint64_t ctx);
+int posix_inode_ctx_set_unlink_flag (inode_t *inode, xlator_t *this,
+ uint64_t ctx);
+
+int posix_inode_ctx_get_all (inode_t *inode, xlator_t *this,
+ posix_inode_ctx_t **ctx);
+
+int __posix_inode_ctx_set_unlink_flag (inode_t *inode, xlator_t *this,
+ uint64_t ctx);
+
+int __posix_inode_ctx_get_all (inode_t *inode, xlator_t *this,
+ posix_inode_ctx_t **ctx);
int posix_gfid_set (xlator_t *this, const char *path, loc_t *loc,
dict_t *xattr_req);
--
1.8.3.1