These patches are about improving the NFS I/O.
1) a new locking scheme between O_DIRECT and buffered I/O in order to allow
parallelisation of O_DIRECT.
2) Remove instances of inode_lock that are preventing parallelism of writes
and attribute revalidation.
3) Remove a redundant write throttling scheme that was conspiring with
the FLUSH_COND_STABLE mode to drive writeback performance down.
4) Cache attributes more aggressively when we can assume close to open cache
consistency.
5) Don't force data sync to disk where it is not needed. If attributes need
to be up to date, we can usually get by with unstable writes to the server,
particularly when we're using NFSv4 and can rely on stateids to cause
operations to fail on a server reboot.
6) Fix a number of bugs around pNFS and attributes. Some (but not all)
pNFS dialects may need data sync + layoutcommit in order to ensure that
data and attribute updates are visible.
In particular fix one bug was causing file size changes to be clobbered
when layoutcommit was pending.
Trond Myklebust (28):
NFS: Don't flush caches for a getattr that races with writeback
NFS: Cache access checks more aggressively
NFS: Cache aggressively when file is open for writing
NFS: Kill NFS_INO_NFS_INO_FLUSHING: it is a performance killer
NFS: writepage of a single page should not be synchronous
NFS: Don't hold the inode lock across fsync()
NFS: Don't call COMMIT in ->releasepage()
pNFS/files: Fix layoutcommit after a commit to DS
pNFS/flexfiles: Fix layoutcommit after a commit to DS
pNFS/flexfiles: Clean up calls to pnfs_set_layoutcommit()
pNFS: Files and flexfiles always need to commit before layoutcommit
pNFS: Ensure we layoutcommit before revalidating attributes
pNFS: pnfs_layoutcommit_outstanding() is no longer used when
!CONFIG_NFS_V4_1
NFS: Fix O_DIRECT verifier problems
NFS: Ensure we reset the write verifier 'committed' value on resend.
NFS: Remove racy size manipulations in O_DIRECT
NFS Cleanup: move call to generic_write_checks() into fs/nfs/direct.c
NFS: Move buffered I/O locking into nfs_file_write()
NFS: Do not serialise O_DIRECT reads and writes
NFS: Cleanup nfs_direct_complete()
NFS: Remove redundant waits for O_DIRECT in fsync() and write_begin()
NFS: Remove unused function nfs_revalidate_mapping_protected()
NFS: Do not aggressively cache file attributes in the case of O_DIRECT
NFS: Getattr doesn't require data sync semantics
NFSv4.2: Fix a race in nfs42_proc_deallocate()
NFSv4.2: Fix writeback races in nfs4_copy_file_range
NFSv4.2: llseek(SEEK_HOLE) and llseek(SEEK_DATA) don't require data
sync
NFS nfs_vm_page_mkwrite: Don't freeze me, Bro...
fs/nfs/Makefile | 2 +-
fs/nfs/dir.c | 52 +++++++-----
fs/nfs/direct.c | 93 +++++++--------------
fs/nfs/file.c | 96 ++++++---------------
fs/nfs/filelayout/filelayout.c | 12 +--
fs/nfs/flexfilelayout/flexfilelayout.c | 23 +++---
fs/nfs/inode.c | 133 ++++++++++++++---------------
fs/nfs/internal.h | 40 +++++++++
fs/nfs/io.c | 147 +++++++++++++++++++++++++++++++++
fs/nfs/nfs42proc.c | 21 ++++-
fs/nfs/nfs4file.c | 14 +---
fs/nfs/nfs4xdr.c | 11 ++-
fs/nfs/nfstrace.h | 1 -
fs/nfs/pnfs.c | 5 +-
fs/nfs/pnfs.h | 7 --
fs/nfs/pnfs_nfs.c | 7 ++
fs/nfs/write.c | 33 +++++---
include/linux/nfs_fs.h | 3 +-
18 files changed, 420 insertions(+), 280 deletions(-)
create mode 100644 fs/nfs/io.c
--
2.7.4
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