LU-2282 obdclass: Slightly increase the size of lu_keys[]
After an "FSTYPE=ldiskfs sh llmount.sh" on a single-node setup, all
the thirty-two slots in lu_keys[] will be consumed. For example,
Slot Key Address Owner
------------------------------------------
lu_keys[0]
ffffffffa0a4bd00 obdclass
lu_keys[1]
ffffffffa0a4fac0 obdclass
lu_keys[2]
ffffffffa0a4d4a0 obdclass
lu_keys[3]
ffffffffa0a58900 obdclass
lu_keys[4]
ffffffffa0a4fd80 obdclass
lu_keys[5]
ffffffffa0a2d940 obdclass
lu_keys[6]
ffffffffa0c34260 ptlrpc
lu_keys[7]
ffffffffa05577a0 fld
lu_keys[8]
ffffffffa0131240 fid
lu_keys[9]
ffffffffa0692140 osc
lu_keys[10]
ffffffffa0692180 osc
lu_keys[11]
ffffffffa074a320 lov
lu_keys[12]
ffffffffa074a360 lov
lu_keys[13]
ffffffffa07d3860 obdecho
lu_keys[14]
ffffffffa07d38a0 obdecho
lu_keys[15]
ffffffffa0819140 lquota
lu_keys[16]
ffffffffa0822460 lquota
lu_keys[17]
ffffffffa081c280 lquota
lu_keys[18]
ffffffffa0afbd60 mgs
lu_keys[19]
ffffffffa0d00fa0 mdd
lu_keys[20]
ffffffffa0d01c20 mdd
lu_keys[21]
ffffffffa0d00f60 mdd
lu_keys[22]
ffffffffa0dd56a0 osd_ldiskfs
lu_keys[23]
ffffffffa0e6bf40 mdt
lu_keys[24]
ffffffffa0ecb6c0 lod
lu_keys[25]
ffffffffa08576c0 osp
lu_keys[26]
ffffffffa0857700 osp
lu_keys[27]
ffffffffa0f17200 ofd
lu_keys[28]
ffffffffa0fd48e0 lustre
lu_keys[29]
ffffffffa0fd4920 lustre
lu_keys[30]
ffffffffa0fd64e0 lustre
lu_keys[31]
ffffffffa0fd6520 lustre
Loading osd_zfs.ko at this point, which is necessary under certain
debugging/testing circumstances, will get ENFILE from
lu_context_key_register(). To make developing on single-node setups
easier while minimizing new array iterating overhead, this patch
increases the size of lu_keys[] by eight words.
A couple of additional things were considered too. First, the number
of keys may be reducible. For instance, the md_ucred and md_capainfo
keys in mdd might be merged into the mdd_thread_info key, at a quick
glance. However, the amount of change is not small. The other thing
is that lu_keys[] could be dynamically allocated and grown on demand.
But additional locking is required when synchronizing
lu_context::lc_value[]s with lu_keys[].
Change-Id: I211bdb8af524a79f99b11f73e7260572459ccb17
Signed-off-by: Li Wei <wei.g.li@intel.com>
Reviewed-on: http://review.whamcloud.com/4476
Tested-by: Hudson
Reviewed-by: Alex Zhuravlev <bzzz@whamcloud.com>
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Mike Pershin <tappro@whamcloud.com>