Quota: heal directory on newly added bricks when quota limit is reached

Problem: if a lookup is done on a newly added brick for a path on which limit
has been reached, the lookup fails to heal the directory tree due to quota.

Solution: Tag the lookup as an internal fop and ignore it in quota.
Since marking internal fop does not usually give enough contextual information.
Introducing new flags to pass the contextual info.

Adding dict_check_flag and dict_set_flag to aid flag operations.
A flag is a single bit in a bit array (currently limited to 256 bits).

Change-Id: Ifb6a68bcaffedd425dd0f01f7db24edd5394c095
fixes: bz#1505355
BUG: 1505355
Signed-off-by: Sanoj Unnikrishnan <sunnikri@redhat.com>

1 files changed, 27 insertions, 0 deletions

diff --git a/libglusterfs/src/glusterfs.h b/libglusterfs/src/glusterfs.h
index 28666de3da4..84e33449dad 100644
--- a/libglusterfs/src/glusterfs.h
+++ b/libglusterfs/src/glusterfs.h
@@ -173,6 +173,33 @@
 #define GLUSTERFS_VERSION_XCHG_KEY     "glusterfs.version.xchg"
 
 #define GLUSTERFS_INTERNAL_FOP_KEY  "glusterfs-internal-fop"
+
+/* GlusterFS Internal FOP Indicator flags
+ * (To pass information on the context in which a paritcular
+ *  fop is performed between translators)
+ * The presence of a particular flag must be treated as an
+ * indicator of the context, however the flag is added only in
+ * a scenario where there is a need for such context across translators.
+ * So it cannot be an absolute information on context.
+ */
+#define GF_INTERNAL_CTX_KEY  "glusterfs.internal-ctx"
+
+/*
+ * Always append entries to end of the enum, do not delete entries.
+ * Currently dict_set_flag allows to set upto 256 flag, if the enum
+ * needs to grow beyond this dict_set_flag has to be changed accordingly
+ */
+enum gf_internal_fop_indicator {
+        GF_DHT_HEAL_DIR       /* Index 0 in bit array*/
+};
+
+/* Todo:
+ * Add GF_FOP_LINK_FILE         0x2ULL
+ * address GLUSTERFS_MARKER_DONT_ACCOUNT_KEY and
+ * GLUSTERFS_INTERNAL_FOP_KEY with this flag
+ */
+
+
 #define DHT_CHANGELOG_RENAME_OP_KEY   "changelog.rename-op"
 
 #define ZR_FILE_CONTENT_STR     "glusterfs.file."