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(-) -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
