On Fri, 24 Jan 2014 21:00:03 +0100, Andreas Rohner wrote:
> On 2014-01-24 19:26, Ryusuke Konishi wrote:
>>> + ret = nilfs_set_suinfo(nilfs, supv, n);
>>> + free(supv);
>>> + if (ret >= 0) {
>>> + /* success, tell caller
>>> + * to try another segment/s */
>>> + ret = -EGCTRYAGAIN;
>>> + goto out_lock;
>>> + }
Returning -EGCTRYAGAIN looks confusing, since posix error code Exxxxx
is usually stored in errno variable in userland. It also looks a bit
hacky.
How about handling this as follows ?
- Add a new structure to return result of GC, for instance, as
follows:
struct nilfs_reclaim_status {
unsigned int ncleanedsegs; /* number of segments cleaned
with nilfs_clean_segments() */
unsigned int ndeferredsegs;/* number of segments deferred
with nilfs_set_suinfo() */
unsigned long nliveblocks; /* sum of live virtual blocks and live
DAT blocks */
unsigned long ndeadblocks; /* number of reclaimable blocks */
unsigned long nlivevblocks; /* live virtual blocks */
unsigned long nfreevblocks; /* freed virtual block addresses */
...
};
- Use the structure as an argument of the "new" API function
(i.e. variant of nilfs_reclaim_segment() )
- Rewrite the variant API function so that it returns a success value
(0) also for the EGCTRYAGAIN case.
- Store other status information in nilfs_reclaim_status structures.
And, I think adding nilfs_set_suinfo() API should be a separate patch.
Regards,
Ryusuke Konishi
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