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Subject[PATCH 00/13] FS-Cache: Fix a number of bugs that occur when the cache runs out of space
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Attached are a bunch of patches that progressively fix bugs that can occur
when the cache hits the hard "must maintain X free space" limit and starts
rejecting requests.

The commit ensubjected "FS-Cache: Synchronise object death state change vs
operation submission" is the main bug I was looking for. Some of the other
patches fix other bugs I found along the way and the remaining patches are
changes pulled out of the bugfixes to make the bugfix commits more narrowly
targeted.

Note that I added some new stats:

Ops : ini=836360 dfr=19 rel=836360 gc=19

The ini=N field here indicates the number of fscache_operation structs that
were initialised and should match the rel=M value.

CacheEv: nsp=3425 stl=0 rtr=0 cul=0

Indicates counts of certain cache backend events: nsp=N shows how many objects
were rejected due to lack of space in the cache, stl=N shows how many objects
were found to be stale upon reuse and thus discarded, rtr=N how many objects
were retired and cul=N shows how many inactive objects were culled.

These can also be found here:

http://git.kernel.org/cgit/linux/kernel/git/dhowells/linux-fs.git/log/?h=fscache-fixes

tagged with:

fscache-fixes-20150226

David
---
David Howells (13):
FS-Cache: Count culled objects and objects rejected due to lack of space
FS-Cache: Move fscache_report_unexpected_submission() to make it more available
FS-Cache: When submitting an op, cancel it if the target object is dying
FS-Cache: Handle a new operation submitted against a killed object
FS-Cache: Synchronise object death state change vs operation submission
FS-Cache: fscache_object_is_dead() has wrong logic, kill it
FS-Cache: Permit fscache_cancel_op() to cancel in-progress operations too
FS-Cache: Out of line fscache_operation_init()
FS-Cache: Count the number of initialised operations
FS-Cache: Fix cancellation of in-progress operation
FS-Cache: Put an aborted initialised op so that it is accounted correctly
FS-Cache: The operation cancellation method needs calling in more places
FS-Cache: Retain the netfs context in the retrieval op earlier


Documentation/filesystems/caching/backend-api.txt | 23 ++
Documentation/filesystems/caching/fscache.txt | 7 -
fs/cachefiles/internal.h | 1
fs/cachefiles/namei.c | 33 ++-
fs/fscache/cookie.c | 8 -
fs/fscache/internal.h | 12 +
fs/fscache/object.c | 69 +++++-
fs/fscache/operation.c | 254 ++++++++++++++-------
fs/fscache/page.c | 86 ++++---
fs/fscache/stats.c | 14 +
include/linux/fscache-cache.h | 55 ++---
11 files changed, 378 insertions(+), 184 deletions(-)



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