meta/rename: lock both src and dst parent for rename op to avoid txn conflicts and performance

[polyrabbit]

Follow-up on #5549 - after uploading to a temporary file, gateway uses rename to move it to the target path. In current implementation, rename only locks parentSrc (in normal cases). #5549 adds an additional hierarchy to reduce conflicts on parentSrc, but conflicts still occur a lot on parentDst when user writes to the same directory concurrently.

So we should lock both parentSrc and parentDst in tkv/sql engines, in consistent with the redis engine.

[anysql]

In txBatchLock there is problem, need to lock according to txLock id, not by inode.

Get a map of (inode % nlocks), and lock them in order.

By the way, we use optimistic lock for parent dir update in sql engine without holding the txLock to improve concurrency.

[polyrabbit]

This PR already locks in order by lock_key(inode%nlocks), not by inode - there is a sort in the beginning. UT also has one case for this possibility.

By the way, we use optimistic lock for parent dir update in sql engine without holding the txLock to improve concurrency.

In tikv txn conflict is expensive, also the wait time caused by exponential backoff further reduces performance. It's better to resolve conflicts locally rather than remotely. I suppose the same rule applies to the sql engine?

[codecov]

Codecov Report

Attention: Patch coverage is 95.65217% with 1 line in your changes missing coverage. Please review.

Project coverage is 21.55%. Comparing base (c8e0516) to head (136c3ae).
Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/meta/sql.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #5574       +/-   ##
===========================================
- Coverage   50.60%   21.55%   -29.05%     
===========================================
  Files          30       29        -1     
  Lines       19809    19184      -625     
===========================================
- Hits        10025     4136     -5889     
- Misses       8348    14558     +6210     
+ Partials     1436      490      -946     

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