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staging: lustre: fld: add fld description documentation

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Add subsystem description from Di Wang to header file.

Signed-off-by: Patrick Farrell <paf@cray.com>
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-5153
Reviewed-on: http://review.whamcloud.com/10631
Reviewed-by: wangdi <di.wang@intel.com>
Reviewed-by: John L. Hammond <john.hammond@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>
Signed-off-by: James Simmons <jsimmons@infradead.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Patrick Farrell 2016-08-16 16:19:12 -04:00 committed by Greg Kroah-Hartman
parent 7aca4ae34c
commit aa08b0e3c7
1 changed files with 19 additions and 0 deletions
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19
drivers/staging/lustre/lustre/fld/fld_internal.h
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@ -31,6 +31,25 @@
*
* lustre/fld/fld_internal.h
*
* Subsystem Description:
* FLD is FID Location Database, which stores where (IE, on which MDT)
* FIDs are located.
* The database is basically a record file, each record consists of a FID
* sequence range, MDT/OST index, and flags. The FLD for the whole FS
* is only stored on the sequence controller(MDT0) right now, but each target
* also has its local FLD, which only stores the local sequence.
*
* The FLD subsystem usually has two tasks:
* 1. maintain the database, i.e. when the sequence controller allocates
* new sequence ranges to some nodes, it will call the FLD API to insert the
* location information <sequence_range, node_index> in FLDB.
*
* 2. Handle requests from other nodes, i.e. if client needs to know where
* the FID is located, if it can not find the information in the local cache,
* it will send a FLD lookup RPC to the FLD service, and the FLD service will
* look up the FLDB entry and return the location information to client.
*
*
* Author: Yury Umanets <umka@clusterfs.com>
* Author: Tom WangDi <wangdi@clusterfs.com>
*/