From 462e3988936761317975fd811dd355b81328b60a Mon Sep 17 00:00:00 2001
From: Amar Tumballi <amarts@redhat.com>
Date: Thu, 14 Mar 2019 10:04:28 +0530
Subject: [PATCH 185/192] gfapi: provide an api for setting statedump path

Currently for an application using glfsapi to use glusterfs, when a
statedump is taken, it uses /var/run/gluster dir to dump info.

There can be concerns as this directory may be owned by some other
user, and hence it may fail taking statedump. Such applications
should have an option to use different path.

This patch provides an API to do so.

Upstream details:
> Updates: bz#1689097
> Change-Id: I8918e002bc823d83614c972b6c738baa04681b23
> URL: https://review.gluster.org/22364

BUG: 1720461
Change-Id: I6079c8d799f35eaf76e62d259b51573bf561ba5b
Signed-off-by: Amar Tumballi <amarts@redhat.com>
Reviewed-on: https://code.engineering.redhat.com/gerrit/173451
Tested-by: RHGS Build Bot <nigelb@redhat.com>
Reviewed-by: Atin Mukherjee <amukherj@redhat.com>
---
 api/src/gfapi.aliases |  2 ++
 api/src/gfapi.map     |  5 ++++
 api/src/glfs.c        | 63 +++++++++++++++++++++++++++++++++++++++++++++++++++
 api/src/glfs.h        | 28 +++++++++++++++++++++++
 4 files changed, 98 insertions(+)

diff --git a/api/src/gfapi.aliases b/api/src/gfapi.aliases
index 09c0fd8..8fdf734 100644
--- a/api/src/gfapi.aliases
+++ b/api/src/gfapi.aliases
@@ -195,3 +195,5 @@ _pub_glfs_zerofill_async _glfs_zerofill_async$GFAPI_6.0
 _pub_glfs_copy_file_range _glfs_copy_file_range$GFAPI_6.0
 _pub_glfs_fsetattr _glfs_fsetattr$GFAPI_6.0
 _pub_glfs_setattr _glfs_setattr$GFAPI_6.0
+
+_pub_glfs_set_statedump_path _glfs_set_statedump_path@GFAPI_future
diff --git a/api/src/gfapi.map b/api/src/gfapi.map
index b97a614..cf118e8 100644
--- a/api/src/gfapi.map
+++ b/api/src/gfapi.map
@@ -271,3 +271,8 @@ GFAPI_PRIVATE_6.1 {
 	global:
 		glfs_setfspid;
 } GFAPI_6.0;
+
+GFAPI_future {
+	global:
+		glfs_set_statedump_path;
+} GFAPI_PRIVATE_6.1;
diff --git a/api/src/glfs.c b/api/src/glfs.c
index f4a8e08..ba513e6 100644
--- a/api/src/glfs.c
+++ b/api/src/glfs.c
@@ -1212,6 +1212,7 @@ glusterfs_ctx_destroy(glusterfs_ctx_t *ctx)
         glusterfs_graph_destroy_residual(trav_graph);
     }
 
+    GF_FREE(ctx->statedump_path);
     FREE(ctx);
 
     return ret;
@@ -1738,3 +1739,65 @@ invalid_fs:
 }
 
 GFAPI_SYMVER_PUBLIC_DEFAULT(glfs_upcall_unregister, 3.13.0);
+
+int
+pub_glfs_set_statedump_path(struct glfs *fs, const char *path)
+{
+    struct stat st;
+    int ret;
+    DECLARE_OLD_THIS;
+    __GLFS_ENTRY_VALIDATE_FS(fs, invalid_fs);
+
+    if (!path) {
+        gf_log("glfs", GF_LOG_ERROR, "path is NULL");
+        errno = EINVAL;
+        goto err;
+    }
+
+    /* If path is not present OR, if it is directory AND has enough permission
+     * to create files, then proceed */
+    ret = sys_stat(path, &st);
+    if (ret && errno != ENOENT) {
+        gf_log("glfs", GF_LOG_ERROR, "%s: not a valid path (%s)", path,
+               strerror(errno));
+        errno = EINVAL;
+        goto err;
+    }
+
+    if (!ret) {
+        /* file is present, now check other things */
+        if (!S_ISDIR(st.st_mode)) {
+            gf_log("glfs", GF_LOG_ERROR, "%s: path is not directory", path);
+            errno = EINVAL;
+            goto err;
+        }
+        if (sys_access(path, W_OK | X_OK) < 0) {
+            gf_log("glfs", GF_LOG_ERROR,
+                   "%s: path doesn't have write permission", path);
+            errno = EPERM;
+            goto err;
+        }
+    }
+
+    /* If set, it needs to be freed, so we don't have leak */
+    GF_FREE(fs->ctx->statedump_path);
+
+    fs->ctx->statedump_path = gf_strdup(path);
+    if (!fs->ctx->statedump_path) {
+        gf_log("glfs", GF_LOG_ERROR,
+               "%s: failed to set statedump path, no memory", path);
+        errno = ENOMEM;
+        goto err;
+    }
+
+    __GLFS_EXIT_FS;
+
+    return 0;
+err:
+    __GLFS_EXIT_FS;
+
+invalid_fs:
+    return -1;
+}
+
+GFAPI_SYMVER_PUBLIC_DEFAULT(glfs_set_statedump_path, future);
diff --git a/api/src/glfs.h b/api/src/glfs.h
index 6714782..a6c12e1 100644
--- a/api/src/glfs.h
+++ b/api/src/glfs.h
@@ -1453,5 +1453,33 @@ int
 glfs_setattr(struct glfs *fs, const char *path, struct glfs_stat *stat,
              int follow) __THROW GFAPI_PUBLIC(glfs_setattr, 6.0);
 
+/*
+  SYNOPSIS
+
+  glfs_set_statedump_path: Function to set statedump path.
+
+  DESCRIPTION
+
+  This function is used to set statedump directory
+
+  PARAMETERS
+
+  @fs: The 'virtual mount' object to be configured with the volume
+       specification file.
+
+  @path: statedump path. Should be a directory. But the API won't fail if the
+  directory doesn't exist yet, as one may create it later.
+
+  RETURN VALUES
+
+   0 : Success.
+  -1 : Failure. @errno will be set with the type of failure.
+
+ */
+
+int
+glfs_set_statedump_path(struct glfs *fs, const char *path) __THROW
+    GFAPI_PUBLIC(glfs_set_statedump_path, future);
+
 __END_DECLS
 #endif /* !_GLFS_H */
-- 
1.8.3.1