This patchset is tended to provide interface for handling IO errors
from internal quota code.
Any error must being returned to fs-caller to signal about possible
quota inconsistency. I've done it in following way:
1) Handle low-level io errors from dqget() and it's callers
2) Handle errors from dquot_initialize
This path catch most of IO error, but no all.
3) Check what i_dquot was initialized in each low-level function.
There are two types of such functions
3A) Charging functions (alloc_{space,inode}): Caller of such
function may easy handle an error and abort an operation.
3B) nofail functions (claim_space,free_{space,inode})
In most cases caller can not abort an operation even if
inode's quotas was semi-initialized, so I just skip this
functions for now.
I would like to know you ideas suggestions about this.
Note: Only ext4's part was basically tested for now, others was just
compile tested.
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