md-cache: Cache security.ima xattrs

Backport of http://review.gluster.org/16296

From kernel version 3.X or greater, creating of a file
results in removexattr call on security.ima xattr. But
this xattr is not set on the file unless IMA feature
is active. With this patch, removxattr call returns
ENODATA if it is not found in the cache.

> Change-Id: I8136096598a983aebc09901945eba1db1b2f93c9
> Signed-off-by: Poornima G <pgurusid@redhat.com>
> Reviewed-on: http://review.gluster.org/16296
> Smoke: Gluster Build System <jenkins@build.gluster.org>
> NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
> CentOS-regression: Gluster Build System <jenkins@build.gluster.org>
> Reviewed-by: Raghavendra G <rgowdapp@redhat.com>
> (cherry picked from commit ac629e574935a8aed6526936bc83b1c6d295ae67)

Change-Id: I27abc23024c8fcf07389608df61ef6e64736d414
BUG: 1415918
Signed-off-by: Poornima G <pgurusid@redhat.com>
Reviewed-on: https://review.gluster.org/16460
Smoke: Gluster Build System <jenkins@build.gluster.org>
NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
CentOS-regression: Gluster Build System <jenkins@build.gluster.org>
Reviewed-by: Raghavendra G <rgowdapp@redhat.com>

1 files changed, 79 insertions, 2 deletions

diff --git a/xlators/performance/md-cache/src/md-cache.c b/xlators/performance/md-cache/src/md-cache.c
index d70fa6a8d1a..61f4da34067 100644
--- a/xlators/performance/md-cache/src/md-cache.c
+++ b/xlators/performance/md-cache/src/md-cache.c
@@ -49,6 +49,8 @@ struct mdc_conf {
 	int  timeout;
 	gf_boolean_t cache_posix_acl;
 	gf_boolean_t cache_selinux;
+        gf_boolean_t cache_capability;
+        gf_boolean_t cache_ima;
 	gf_boolean_t force_readdirp;
         gf_boolean_t cache_swift_metadata;
         gf_boolean_t cache_samba_metadata;
@@ -115,6 +117,11 @@ static struct mdc_key {
 		.check = 1,
 	},
         {
+                .name = "security.ima",
+                .load = 0,
+                .check = 1,
+        },
+        {
                 .name = NULL,
                 .load = 0,
                 .check = 0,
@@ -2226,6 +2233,10 @@ mdc_removexattr (call_frame_t *frame, xlator_t *this, loc_t *loc,
 		 const char *name, dict_t *xdata)
 {
         mdc_local_t  *local = NULL;
+        int           op_errno = ENODATA;
+        int           ret = 0;
+        dict_t       *xattr = NULL;
+        struct mdc_conf *conf = this->private;
 
         local = mdc_local_get (frame);
 
@@ -2233,6 +2244,25 @@ mdc_removexattr (call_frame_t *frame, xlator_t *this, loc_t *loc,
 
 	local->key = gf_strdup (name);
 
+        if (!is_mdc_key_satisfied (name))
+                goto uncached;
+
+        ret = mdc_inode_xatt_get (this, loc->inode, &xattr);
+        if (ret != 0)
+                goto uncached;
+
+        if (!xattr || !dict_get (xattr, (char *)name)) {
+                ret = -1;
+                op_errno = ENODATA;
+        }
+
+        INCREMENT_ATOMIC (conf->mdc_counter.lock, conf->mdc_counter.xattr_hit);
+        MDC_STACK_UNWIND (removexattr, frame, ret, op_errno, xdata);
+
+        return 0;
+
+uncached:
+        INCREMENT_ATOMIC (conf->mdc_counter.lock, conf->mdc_counter.xattr_miss);
         STACK_WIND (frame, mdc_removexattr_cbk,
                     FIRST_CHILD(this), FIRST_CHILD(this)->fops->removexattr,
                     loc, name, xdata);
@@ -2272,6 +2302,10 @@ mdc_fremovexattr (call_frame_t *frame, xlator_t *this, fd_t *fd,
 		  const char *name, dict_t *xdata)
 {
         mdc_local_t  *local = NULL;
+        int           op_errno = ENODATA;
+        int           ret = 0;
+        dict_t       *xattr = NULL;
+        struct mdc_conf *conf = this->private;
 
         local = mdc_local_get (frame);
 
@@ -2279,6 +2313,24 @@ mdc_fremovexattr (call_frame_t *frame, xlator_t *this, fd_t *fd,
 
 	local->key = gf_strdup (name);
 
+        if (!is_mdc_key_satisfied (name))
+                goto uncached;
+
+        ret = mdc_inode_xatt_get (this, fd->inode, &xattr);
+        if (ret != 0)
+                goto uncached;
+
+        if (!xattr || !dict_get (xattr, (char *)name)) {
+                ret = -1;
+                op_errno = ENODATA;
+        }
+
+        INCREMENT_ATOMIC (conf->mdc_counter.lock, conf->mdc_counter.xattr_hit);
+        MDC_STACK_UNWIND (fremovexattr, frame, ret, op_errno, xdata);
+        return 0;
+
+uncached:
+        INCREMENT_ATOMIC (conf->mdc_counter.lock, conf->mdc_counter.xattr_miss);
         STACK_WIND (frame, mdc_fremovexattr_cbk,
                     FIRST_CHILD(this), FIRST_CHILD(this)->fops->fremovexattr,
                     fd, name, xdata);
@@ -2829,7 +2881,16 @@ reconfigure (xlator_t *this, dict_t *options)
 	GF_OPTION_RECONF ("md-cache-timeout", timeout, options, int32, out);
 
 	GF_OPTION_RECONF ("cache-selinux", conf->cache_selinux, options, bool, out);
-	mdc_key_load_set (mdc_keys, "security.", conf->cache_selinux);
+	mdc_key_load_set (mdc_keys, "security.selinux", conf->cache_selinux);
+
+        GF_OPTION_RECONF ("cache-capability-xattrs", conf->cache_capability,
+                          options, bool, out);
+        mdc_key_load_set (mdc_keys, "security.capability",
+                          conf->cache_capability);
+
+        GF_OPTION_RECONF ("cache-ima-xattrs", conf->cache_ima, options, bool,
+                          out);
+        mdc_key_load_set (mdc_keys, "security.ima", conf->cache_ima);
 
 	GF_OPTION_RECONF ("cache-posix-acl", conf->cache_posix_acl, options, bool, out);
 	mdc_key_load_set (mdc_keys, "system.posix_acl_", conf->cache_posix_acl);
@@ -2892,7 +2953,15 @@ init (xlator_t *this)
         GF_OPTION_INIT ("md-cache-timeout", timeout, int32, out);
 
 	GF_OPTION_INIT ("cache-selinux", conf->cache_selinux, bool, out);
-	mdc_key_load_set (mdc_keys, "security.", conf->cache_selinux);
+	mdc_key_load_set (mdc_keys, "security.selinux", conf->cache_selinux);
+
+        GF_OPTION_INIT ("cache-capability-xattrs", conf->cache_capability,
+                        bool, out);
+        mdc_key_load_set (mdc_keys, "security.capability",
+                          conf->cache_capability);
+
+        GF_OPTION_INIT ("cache-ima-xattrs", conf->cache_ima, bool, out);
+        mdc_key_load_set (mdc_keys, "security.ima", conf->cache_ima);
 
 	GF_OPTION_INIT ("cache-posix-acl", conf->cache_posix_acl, bool, out);
 	mdc_key_load_set (mdc_keys, "system.posix_acl_", conf->cache_posix_acl);
@@ -3039,6 +3108,14 @@ struct volume_options options[] = {
 	  .type = GF_OPTION_TYPE_BOOL,
 	  .default_value = "false",
 	},
+        { .key = {"cache-capability-xattrs"},
+          .type = GF_OPTION_TYPE_BOOL,
+          .default_value = "true",
+        },
+        { .key = {"cache-ima-xattrs"},
+          .type = GF_OPTION_TYPE_BOOL,
+          .default_value = "true",
+        },
         { .key = {"cache-swift-metadata"},
           .type = GF_OPTION_TYPE_BOOL,
           .default_value = "true",