performance/write-behind: dump contents of wb-file

Signed-off-by: Raghavendra G <raghavendra@gluster.com>
Signed-off-by: Vijay Bellur <vijay@dev.gluster.com>

BUG: 1059 (enhancements for getting statistics from performance translators)
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=1059

6 files changed, 164 insertions, 28 deletions

diff --git a/libglusterfs/src/fd.c b/libglusterfs/src/fd.c
index 870c85e3f..9e91cdb83 100644
--- a/libglusterfs/src/fd.c
+++ b/libglusterfs/src/fd.c
@@ -806,3 +806,56 @@ fdtable_dump (fdtable_t *fdtable, char *prefix)
 
         pthread_mutex_unlock(&fdtable->lock);
 }
+
+
+void
+fd_ctx_dump (fd_t *fd, char *prefix)
+{
+        struct _fd_ctx *fd_ctx = NULL;
+        xlator_t       *xl     = NULL;
+        int    i               = 0;
+        
+
+        if ((fd == NULL) || (fd->_ctx == NULL)) {
+                goto out;
+        }
+
+        LOCK (&fd->lock);
+        {
+                if (fd->_ctx != NULL) {
+                        fd_ctx = GF_CALLOC (fd->inode->table->xl->graph->xl_count,
+                                            sizeof (*fd_ctx),
+                                            gf_common_mt_fd_ctx);
+                        if (fd_ctx == NULL) {
+                                gf_log ("fd", GF_LOG_ERROR, "out of memory");
+                                goto unlock;
+                        }
+
+                        for (i = 0; i < fd->inode->table->xl->graph->xl_count;
+                             i++) {
+                                fd_ctx[i] = fd->_ctx[i];
+                        }
+                }
+        }
+unlock:
+        UNLOCK (&fd->lock);
+        
+        if (fd_ctx == NULL) {
+                goto out;
+        }
+
+        for (i = 0; i < fd->inode->table->xl->graph->xl_count; i++) {
+                if (fd_ctx[i].xl_key) {
+                        xl = (xlator_t *)(long)fd_ctx[i].xl_key;
+                        if (xl->dumpops && xl->dumpops->fdctx)
+                                xl->dumpops->fdctx (xl, fd);
+                }
+        }
+
+out:
+        if (fd_ctx != NULL) {
+                GF_FREE (fd_ctx);
+        }
+
+        return;
+}
diff --git a/libglusterfs/src/fd.h b/libglusterfs/src/fd.h
index e01ef753e..4ea7fc165 100644
--- a/libglusterfs/src/fd.h
+++ b/libglusterfs/src/fd.h
@@ -164,5 +164,10 @@ __fd_ctx_get (fd_t *fd, xlator_t *xlator, uint64_t *value);
 int
 __fd_ctx_del (fd_t *fd, xlator_t *xlator, uint64_t *value);
 
+fd_t *
+_fd_ref (fd_t *fd);
+
+void
+fd_ctx_dump (fd_t *fd, char *prefix);
 
 #endif /* _FD_H */
diff --git a/libglusterfs/src/inode.c b/libglusterfs/src/inode.c
index 45d151ef0..989c25217 100644
--- a/libglusterfs/src/inode.c
+++ b/libglusterfs/src/inode.c
@@ -23,6 +23,7 @@
 #endif
 
 #include "inode.h"
+#include "fd.h"
 #include "common-utils.h"
 #include "statedump.h"
 #include <pthread.h>
@@ -36,7 +37,7 @@
    move latest accessed dentry to list_head of inode
 */
 
-#define INODE_DUMP_LIST(head, key_buf, key_prefix, list_type)           \
+#define INODE_DUMP_LIST(head, key_buf, key_prefix, list_type) \
         {                                                               \
                 int i = 1;                                              \
                 inode_t *inode = NULL;                                  \
@@ -54,6 +55,9 @@ __inode_unref (inode_t *inode);
 static int
 inode_table_prune (inode_table_t *table);
 
+void
+fd_dump (struct list_head *head, char *prefix);
+
 static int
 hash_dentry (inode_t *parent, const char *name, int mod)
 {
@@ -1351,47 +1355,105 @@ inode_ctx_del (inode_t *inode, xlator_t *key, uint64_t *value)
 void
 inode_dump (inode_t *inode, char *prefix)
 {
-        char            key[GF_DUMP_MAX_BUF_LEN];
-        int             ret = -1;
-        xlator_t        *xl = NULL;
-        int             i = 0;
-        char            uuidbuf[256];
+        char               key[GF_DUMP_MAX_BUF_LEN];
+        int                ret       = -1;
+        xlator_t          *xl        = NULL;
+        int                i         = 0;
+        char               uuidbuf[256];
+        fd_t              *fd        = NULL;
+        struct _inode_ctx *inode_ctx = NULL;
+        struct  fd_wrapper {
+                fd_t *fd;
+                struct list_head next;
+        } *fd_wrapper, *tmp;
+        struct list_head fd_list;
 
         if (!inode)
                 return;
 
+        INIT_LIST_HEAD (&fd_list);
+
         ret = TRY_LOCK(&inode->lock);
 
         if (ret != 0) {
-                gf_log("", GF_LOG_WARNING, "Unable to dump inode"
-                       " errno: %d", errno);
+                gf_log ("", GF_LOG_WARNING, "Unable to dump inode"
+                        " errno: %d", errno);
                 return;
         }
 
-        uuid_unparse (inode->gfid, uuidbuf);
-        gf_proc_dump_build_key(key, prefix, "gfid");
-        gf_proc_dump_write(key, "%s", uuidbuf);
-        gf_proc_dump_build_key(key, prefix, "nlookup");
-        gf_proc_dump_write(key, "%ld", inode->nlookup);
-        gf_proc_dump_build_key(key, prefix, "ref");
-        gf_proc_dump_write(key, "%u", inode->ref);
-        gf_proc_dump_build_key(key, prefix, "ino");
-        gf_proc_dump_write(key, "%ld", inode->ino);
-        gf_proc_dump_build_key(key, prefix, "ia_type");
-        gf_proc_dump_write(key, "%d", inode->ia_type);
+        {
+                uuid_unparse (inode->gfid, uuidbuf);
+                gf_proc_dump_build_key(key, prefix, "gfid");
+                gf_proc_dump_write(key, "%s", uuidbuf);
+                gf_proc_dump_build_key(key, prefix, "nlookup");
+                gf_proc_dump_write(key, "%ld", inode->nlookup);
+                gf_proc_dump_build_key(key, prefix, "ref");
+                gf_proc_dump_write(key, "%u", inode->ref);
+                gf_proc_dump_build_key(key, prefix, "ino");
+                gf_proc_dump_write(key, "%ld", inode->ino);
+                gf_proc_dump_build_key(key, prefix, "ia_type");
+                gf_proc_dump_write(key, "%d", inode->ia_type);
+                if (inode->_ctx) {
+                        inode_ctx = GF_CALLOC (inode->table->xl->graph->xl_count,
+                                               sizeof (*inode_ctx),
+                                               gf_common_mt_inode_ctx);
+                        if (inode_ctx == NULL) {
+                                gf_log ("", GF_LOG_ERROR, "out of memory");
+                                goto unlock;
+                        }
+
+                        for (i = 0; i < inode->table->xl->graph->xl_count; i++) {
+                                inode_ctx[i] = inode->_ctx[i];
+                        }
+                }
+
+                if (list_empty (&inode->fd_list)) {
+                        goto unlock;
+                }
+
+                list_for_each_entry (fd, &inode->fd_list, inode_list) {
+                        fd_wrapper = GF_CALLOC (1, sizeof (*fd_wrapper),
+                                                gf_common_mt_char);
+                        if (fd_wrapper == NULL) {
+                                gf_log ("", GF_LOG_ERROR, "out of memory");
+                                goto unlock;
+                        }
+
+                        INIT_LIST_HEAD (&fd_wrapper->next);
+                        list_add_tail (&fd_wrapper->next, &fd_list);
+
+                        fd_wrapper->fd = _fd_ref (fd);
+                }
+        }
+unlock:
         UNLOCK(&inode->lock);
-        if (!inode->_ctx)
-                goto out;
 
-        for (i = 0; i < inode->table->xl->graph->xl_count; i++) {
-                if (inode->_ctx[i].xl_key) {
-                        xl = (xlator_t *)(long)inode->_ctx[i].xl_key;
-                        if (xl->dumpops && xl->dumpops->inodectx)
-                                xl->dumpops->inodectx (xl, inode);
+        if (inode_ctx && (dump_options.xl_options.dump_inodectx == _gf_true)) {
+                for (i = 0; i < inode->table->xl->graph->xl_count; i++) {
+                        if (inode_ctx[i].xl_key) {
+                                xl = (xlator_t *)(long)inode_ctx[i].xl_key;
+                                if (xl->dumpops && xl->dumpops->inodectx)
+                                        xl->dumpops->inodectx (xl, inode);
+                        }
                 }
         }
 
-out:
+        if (!list_empty (&fd_list)
+            && (dump_options.xl_options.dump_fdctx == _gf_true)) {
+                list_for_each_entry_safe (fd_wrapper, tmp, &fd_list,
+                                          next) {
+                        list_del (&fd_wrapper->next);
+                        fd_ctx_dump (fd_wrapper->fd, prefix);
+
+                        fd_unref (fd_wrapper->fd);
+                        GF_FREE (fd_wrapper);
+                }
+        }
+
+        if (inode_ctx != NULL) {
+                GF_FREE (inode_ctx);
+        }
+
         return;
 }
 
diff --git a/libglusterfs/src/statedump.c b/libglusterfs/src/statedump.c
index 230e7c2ef..55832d2c8 100644
--- a/libglusterfs/src/statedump.c
+++ b/libglusterfs/src/statedump.c
@@ -39,7 +39,7 @@ extern xlator_t global_xlator;
 
 static pthread_mutex_t  gf_proc_dump_mutex;
 static int gf_dump_fd = -1;
-static gf_dump_options_t dump_options;
+gf_dump_options_t dump_options;
 
 
 static void
@@ -292,6 +292,10 @@ gf_proc_dump_parse_set_option (char *key, char *value)
                 opt_key = &dump_options.xl_options.dump_fd;
         } else if (!strncasecmp (key, "inode", 5)) {
                 opt_key = &dump_options.xl_options.dump_inode;
+        } else if (!strncasecmp (key, "inodectx", strlen ("inodectx"))) {
+                opt_key = &dump_options.xl_options.dump_inodectx;
+        } else if (!strncasecmp (key, "fdctx", strlen ("fdctx"))) {
+                opt_key = &dump_options.xl_options.dump_fdctx;
         }
 
         if (!opt_key) {
@@ -322,6 +326,9 @@ gf_proc_dump_enable_all_options ()
         GF_PROC_DUMP_SET_OPTION (dump_options.xl_options.dump_priv, _gf_true);
         GF_PROC_DUMP_SET_OPTION (dump_options.xl_options.dump_inode, _gf_true);
         GF_PROC_DUMP_SET_OPTION (dump_options.xl_options.dump_fd, _gf_true);
+        GF_PROC_DUMP_SET_OPTION (dump_options.xl_options.dump_inodectx,
+                                 _gf_true);
+        GF_PROC_DUMP_SET_OPTION (dump_options.xl_options.dump_fdctx, _gf_true);
 
         return 0;
 }
@@ -337,6 +344,9 @@ gf_proc_dump_disable_all_options ()
         GF_PROC_DUMP_SET_OPTION (dump_options.xl_options.dump_inode,
                                                                 _gf_false);
         GF_PROC_DUMP_SET_OPTION (dump_options.xl_options.dump_fd, _gf_false);
+        GF_PROC_DUMP_SET_OPTION (dump_options.xl_options.dump_inodectx,
+                                 _gf_false);
+        GF_PROC_DUMP_SET_OPTION (dump_options.xl_options.dump_fdctx, _gf_false);
 
         return 0;
 }
diff --git a/libglusterfs/src/statedump.h b/libglusterfs/src/statedump.h
index 02cba5bac..ba23ca559 100644
--- a/libglusterfs/src/statedump.h
+++ b/libglusterfs/src/statedump.h
@@ -35,6 +35,8 @@ typedef struct gf_dump_xl_options_ {
         gf_boolean_t    dump_priv;
         gf_boolean_t    dump_inode;
         gf_boolean_t    dump_fd;
+        gf_boolean_t    dump_inodectx;
+        gf_boolean_t    dump_fdctx;
 } gf_dump_xl_options_t;
 
 typedef struct gf_dump_options_ {
@@ -44,6 +46,8 @@ typedef struct gf_dump_options_ {
         gf_dump_xl_options_t    xl_options; //options for all xlators
 } gf_dump_options_t;
 
+extern gf_dump_options_t dump_options;
+
 static inline
 void _gf_proc_dump_build_key (char *key, const char *prefix, char *fmt,...)
 {
diff --git a/libglusterfs/src/xlator.h b/libglusterfs/src/xlator.h
index c71aa7bb3..2aa9b372b 100644
--- a/libglusterfs/src/xlator.h
+++ b/libglusterfs/src/xlator.h
@@ -732,12 +732,14 @@ typedef int32_t (*dumpop_fd_t)  (xlator_t   *this);
 
 typedef int32_t (*dumpop_inodectx_t) (xlator_t *this, inode_t *ino);
 
+typedef int32_t (*dumpop_fdctx_t) (xlator_t *this, fd_t *fd);
 
 struct xlator_dumpops {
 	dumpop_priv_t            priv;
 	dumpop_inode_t           inode;
         dumpop_fd_t              fd;
 	dumpop_inodectx_t        inodectx;
+        dumpop_fdctx_t           fdctx;
 };
 
 typedef struct xlator_list {