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2019-08-19NFS: Fix initialisation of I/O result struct in nfs_pgio_rpcsetupTrond Myklebust1-1/+1
Initialise the result count to 0 rather than initialising it to the argument count. The reason is that we want to ensure we record the I/O stats correctly in the case where an error is returned (for instance in the layoutstats). Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2019-08-19NFS: Ensure O_DIRECT reports an error if the bytes read/written is 0Trond Myklebust1-0/+1
If the attempt to resend the I/O results in no bytes being read/written, we must ensure that we report the error. Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com> Fixes: 0a00b77b331a ("nfs: mirroring support for direct io") Cc: stable@vger.kernel.org # v3.20+
2019-08-19NFSv4/pnfs: Fix a page lock leak in nfs_pageio_resend()Trond Myklebust1-7/+9
If the attempt to resend the pages fails, we need to ensure that we clean up those pages that were not transmitted. Fixes: d600ad1f2bdb ("NFS41: pop some layoutget errors to application") Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com> Cc: stable@vger.kernel.org # v4.5+
2019-07-06NFS: Clean up writeback codeTrond Myklebust1-4/+2
Now that the VM promises never to recurse back into the filesystem layer on writeback, remove all the GFP_NOFS references etc from the generic writeback code. Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2019-05-21treewide: Add SPDX license identifier for missed filesThomas Gleixner1-0/+1
Add SPDX license identifiers to all files which: - Have no license information of any form - Have EXPORT_.*_SYMBOL_GPL inside which was used in the initial scan/conversion to ignore the file These files fall under the project license, GPL v2 only. The resulting SPDX license identifier is: GPL-2.0-only Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-04-25NFS: Remove redundant open context from nfs_pageTrond Myklebust1-6/+2
The lock context already references and tracks the open context, so take the opportunity to save some space in struct nfs_page. Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2019-04-25NFS: Add a helper to return a pointer to the open context of a struct nfs_pageTrond Myklebust1-4/+4
Add a helper for when we remove the explicit pointer to the open context. Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2019-04-25pNFS: Add tracking to limit the number of pNFS retriesTrond Myklebust1-1/+13
When the client is reading or writing using pNFS, and hits an error on the DS, then it typically sends a LAYOUTERROR and/or LAYOUTRETURN to the MDS, before redirtying the failed pages, and going for a new round of reads/writebacks. The problem is that if the server has no way to fix the DS, then we may need a way to interrupt this loop after a set number of attempts have been made. This patch adds an optional module parameter that allows the admin to specify how many times to retry the read/writeback process before failing with a fatal error. The default behaviour is to retry forever. Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2019-04-25NFS: Remove unused argument from nfs_create_request()Trond Myklebust1-8/+8
All the callers of nfs_create_request() are now creating page group heads, so we can remove the redundant 'last' page argument. Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2019-04-25NFS: Fix up NFS I/O subrequest creationTrond Myklebust1-38/+55
We require all NFS I/O subrequests to duplicate the lock context as well as the open context. Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2019-02-20NFS: Fix up documentation warningsTrond Myklebust1-4/+3
Fix up some compiler warnings about function parameters, etc not being correctly described or formatted. Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2019-02-20NFS: Pass error information to the pgio error cleanup routineTrond Myklebust1-2/+3
Allow the caller to pass error information when cleaning up a failed I/O request so that we can conditionally take action to cancel the request altogether if the error turned out to be fatal. Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2019-02-20NFS: Clean up list moves of struct nfs_pageTrond Myklebust1-8/+4
In several places we're just moving the struct nfs_page from one list to another by first removing from the existing list, then adding to the new one. Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2019-02-20NFS: Don't recoalesce on error in nfs_pageio_complete_mirror()Trond Myklebust1-1/+1
If the I/O completion failed with a fatal error, then we should just exit nfs_pageio_complete_mirror() rather than try to recoalesce. Fixes: a7d42ddb3099 ("nfs: add mirroring support to pgio layer") Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com> Cc: stable@vger.kernel.org # v4.0+
2019-02-20NFS: Fix an I/O request leakage in nfs_do_recoalesceTrond Myklebust1-1/+0
Whether we need to exit early, or just reprocess the list, we must not lost track of the request which failed to get recoalesced. Fixes: 03d5eb65b538 ("NFS: Fix a memory leak in nfs_do_recoalesce") Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com> Cc: stable@vger.kernel.org # v4.0+
2019-02-20NFS: Fix I/O request leakagesTrond Myklebust1-5/+21
When we fail to add the request to the I/O queue, we currently leave it to the caller to free the failed request. However since some of the requests that fail are actually created by nfs_pageio_add_request() itself, and are not passed back the caller, this leads to a leakage issue, which can again cause page locks to leak. This commit addresses the leakage by freeing the created requests on error, using desc->pg_completion_ops->error_cleanup() Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com> Fixes: a7d42ddb30997 ("nfs: add mirroring support to pgio layer") Cc: stable@vger.kernel.org # v4.0: c18b96a1b862: nfs: clean up rest of reqs Cc: stable@vger.kernel.org # v4.0: d600ad1f2bdb: NFS41: pop some layoutget Cc: stable@vger.kernel.org # v4.0+
2018-12-19NFS/NFSD/SUNRPC: replace generic creds with 'struct cred'.NeilBrown1-1/+1
SUNRPC has two sorts of credentials, both of which appear as "struct rpc_cred". There are "generic credentials" which are supplied by clients such as NFS and passed in 'struct rpc_message' to indicate which user should be used to authorize the request, and there are low-level credentials such as AUTH_NULL, AUTH_UNIX, AUTH_GSS which describe the credential to be sent over the wires. This patch replaces all the generic credentials by 'struct cred' pointers - the credential structure used throughout Linux. For machine credentials, there is a special 'struct cred *' pointer which is statically allocated and recognized where needed as having a special meaning. A look-up of a low-level cred will map this to a machine credential. Signed-off-by: NeilBrown <neilb@suse.com> Acked-by: J. Bruce Fields <bfields@redhat.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2018-12-19nfs: fix comment to nfs_generic_pg_test which does the oppositePavel Tikhomirov1-1/+1
Please see comment to filelayout_pg_test for reference. To: Trond Myklebust <trond.myklebust@hammerspace.com> Cc: Anna Schumaker <anna.schumaker@netapp.com> Cc: linux-nfs@vger.kernel.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Pavel Tikhomirov <ptikhomirov@virtuozzo.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2018-10-18nfs: remove redundant call to nfs_context_set_write_error()Benjamin Coddington1-4/+0
We don't need to call this in the direct, read, or pnfs resend paths and the only other caller is the write path in nfs_page_async_flush() which already checks and sets the pg_error on the context. Signed-off-by: Benjamin Coddington <bcodding@redhat.com> Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2018-10-18nfs: Fix a missed page unlock after pg_doio()Benjamin Coddington1-19/+21
We must check pg_error and call error_cleanup after any call to pg_doio. Currently, we are skipping the unlock of a page if we encounter an error in nfs_pageio_complete() before handing off the work to the RPC layer. Signed-off-by: Benjamin Coddington <bcodding@redhat.com> Cc: stable@vger.kernel.org Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2018-09-30NFS: Remove private spinlock in struct nfs_pgio_headerTrond Myklebust1-7/+6
Now that each struct nfs_pgio_header corresponds to one RPC call, we only have one writer to the struct nfs_pgio_header. Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
2018-08-08NFS: Mark expected switch fall-throughsGustavo A. R. Silva1-0/+1
In preparation to enabling -Wimplicit-fallthrough, mark switch cases where we are expecting to fall through. Warning level 2 was used: -Wimplicit-fallthrough=2 Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2018-03-20sched/wait, fs/nfs: Convert wait_on_atomic_t() usage to the new wait_var_event() APIPeter Zijlstra1-3/+3
The old wait_on_atomic_t() is going to get removed, use the more flexible wait_var_event() API instead. No change in functionality. Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Anna Schumaker <anna.schumaker@netapp.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
2018-01-14NFS: remove unused offset arg in nfs_pgio_rpcsetupBenjamin Coddington1-4/+4
nfs_pgio_rpcsetup() is always called with an offset of 0, so we should be able to drop the arguement altogether. Signed-off-by: Benjamin Coddington <bcodding@redhat.com> Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2017-09-11NFS: various changes relating to reporting IO errors.NeilBrown1-2/+2
1/ remove 'start' and 'end' args from nfs_file_fsync_commit(). They aren't used. 2/ Make nfs_context_set_write_error() a "static inline" in internal.h so we can... 3/ Use nfs_context_set_write_error() instead of mapping_set_error() if nfs_pageio_add_request() fails before sending any request. NFS generally keeps errors in the open_context, not the mapping, so this is more consistent. 4/ If filemap_write_and_write_range() reports any error, still check ctx->error. The value in ctx->error is likely to be more useful. As part of this, NFS_CONTEXT_ERROR_WRITE is cleared slightly earlier, before nfs_file_fsync_commit() is called, rather than at the start of that function. Signed-off-by: NeilBrown <neilb@suse.com> Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2017-09-08NFS: Fix 2 use after free issues in the I/O codeTrond Myklebust1-14/+12
The writeback code wants to send a commit after processing the pages, which is why we want to delay releasing the struct path until after that's done. Also, the layout code expects that we do not free the inode before we've put the layout segments in pnfs_writehdr_free() and pnfs_readhdr_free() Fixes: 919e3bd9a875 ("NFS: Ensure we commit after writeback is complete") Fixes: 4714fb51fd03 ("nfs: remove pgio_header refcount, related cleanup") Cc: stable@vger.kernel.org Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2017-08-20Merge branch 'bugfixes'Trond Myklebust1-37/+40
2017-08-20NFS: Remove unused parameter gfp_flags from nfs_pageio_init()Trond Myklebust1-3/+1
Now that the mirror allocation has been moved, the parameter can go. Also remove the redundant symbol export. Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2017-08-20NFSv4: Fix up mirror allocationTrond Myklebust1-34/+39
There are a number of callers of nfs_pageio_complete() that want to continue using the nfs_pageio_descriptor without needing to call nfs_pageio_init() again. Examples include nfs_pageio_resend() and nfs_pageio_cond_complete(). The problem is that nfs_pageio_complete() also calls nfs_pageio_cleanup_mirroring(), which frees up the array of mirrors. This can lead to writeback errors, in the next call to nfs_pageio_setup_mirroring(). Fix by simply moving the allocation of the mirrors to nfs_pageio_setup_mirroring(). Link: https://bugzilla.kernel.org/show_bug.cgi?id=196709 Reported-by: JianhongYin <yin-jianhong@163.com> Cc: stable@vger.kernel.org # 4.0+ Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2017-08-15NFS: Wait for requests that are locked on the commit listTrond Myklebust1-0/+2
If a request is on the commit list, but is locked, we will currently skip it, which can lead to livelocking when the commit count doesn't reduce to zero. Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2017-08-15NFS: Use an atomic_long_t to count the number of requestsTrond Myklebust1-3/+1
Rather than forcing us to take the inode->i_lock just in order to bump the number. Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2017-08-15NFS: Remove unused parameter from nfs_page_group_lock()Trond Myklebust1-20/+11
nfs_page_group_lock() is now always called with the 'nonblock' parameter set to 'false'. Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2017-08-15NFS: Remove unuse function nfs_page_group_lock_wait()Trond Myklebust1-21/+0
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2017-08-15NFS: Ensure we always dereference the page head lastTrond Myklebust1-5/+6
This fixes a race with nfs_page_group_sync_on_bit() whereby the call to wake_up_bit() in nfs_page_group_unlock() could occur after the page header had been freed. Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2017-07-13NFS: Don't run wake_up_bit() when nobody is waiting...Trond Myklebust1-1/+16
"perf lock" shows fairly heavy contention for the bit waitqueue locks when doing an I/O heavy workload. Use a bit to tell whether or not there has been contention for a lock so that we can optimise away the bit waitqueue options in those cases. Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2017-07-13NFS: Fix initialization of nfs_page_array->npagesBenjamin Coddington1-0/+1
Commit 8ef9b0b9e1c0 open-coded nfs_pgarray_set(), and left out the initialization of the nfs_page_array's npages. This mistake didn't show up until testing with block layouts, and there shows that all pNFS reads return -EIO. Fixes: 8ef9b0b9e1c0 ("NFS: move nfs_pgarray_set() to open code") Signed-off-by: Benjamin Coddington <bcodding@redhat.com> Cc: stable@vger.kernel.org # 4.12 Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2017-07-13NFS: Ensure we commit after writeback is completeTrond Myklebust1-0/+3
If the page cache is being flushed, then we want to ensure that we do start a commit once the pages are done being flushed. If we just wait until all I/O is done to that file, we can end up livelocking until the balance_dirty_pages() mechanism puts its foot down and forces I/O to stop. So instead we do more or less the same thing that O_DIRECT does, and set up a counter to tell us when the flush is done, Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2017-07-13NFS: Remove unused fields in the page I/O structuresTrond Myklebust1-2/+0
Remove the 'layout_private' fields that were only used by the pNFS OSD layout driver. Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2017-04-21NFS: Add an iocounter wait function for async RPC tasksBenjamin Coddington1-1/+33
By sleeping on a new NFS Unlock-On-Close waitqueue, rpc tasks may wait for a lock context's iocounter to reach zero. The rpc waitqueue is only woken when the open_context has the NFS_CONTEXT_UNLOCK flag set in order to mitigate spurious wake-ups for any iocounter reaching zero. Signed-off-by: Benjamin Coddington <bcodding@redhat.com> Reviewed-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2017-04-20NFS: move rw_mode to nfs_pageio_headerBenjamin Coddington1-5/+3
Let's try to have it in a cacheline in nfs4_proc_pgio_rpc_prepare(). Signed-off-by: Benjamin Coddington <bcodding@redhat.com> Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2017-04-20NFS: move nfs_pgarray_set() to open codeBenjamin Coddington1-20/+14
Since commit 00bfa30abe86 ("NFS: Create a common pgio_alloc and pgio_release function"), nfs_pgarray_set() has only a single caller. Let's open code it. Signed-off-by: Benjamin Coddington <bcodding@redhat.com> Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2017-04-20NFS: Use GFP_NOIO for two allocations in writebackBenjamin Coddington1-4/+11
Prevent a deadlock that can occur if we wait on allocations that try to write back our pages. Signed-off-by: Benjamin Coddington <bcodding@redhat.com> Fixes: 00bfa30abe869 ("NFS: Create a common pgio_alloc and pgio_release...") Cc: stable@vger.kernel.org # 3.16+ Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2017-04-20NFS: Fix missing pg_cleanup after nfs_pageio_cond_complete()Benjamin Coddington1-2/+4
Commit a7d42ddb3099727f58366fa006f850a219cce6c8 ("nfs: add mirroring support to pgio layer") moved pg_cleanup out of the path when there was non-sequental I/O that needed to be flushed. The result is that for layouts that have more than one layout segment per file, the pg_lseg is not cleared, so we can end up hitting the WARN_ON_ONCE(req_start >= seg_end) in pnfs_generic_pg_test since the pg_lseg will be pointing to that previously-flushed layout segment. Signed-off-by: Benjamin Coddington <bcodding@redhat.com> Fixes: a7d42ddb3099 ("nfs: add mirroring support to pgio layer") Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2016-12-01NFS: discard nfs_lockowner structure.NeilBrown1-1/+1
It now has only one field and is only used in one structure. So replaced it in that structure by the field it contains. Signed-off-by: NeilBrown <neilb@suse.com> Reviewed-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2016-12-01NFS: remove l_pid field from nfs_lockownerNeilBrown1-2/+1
this field is not used in any important way and probably should have been removed by Commit: 8003d3c4aaa5 ("nfs4: treat lock owners as opaque values") which removed the pid argument from nfs4_get_lock_state. Except in unusual and uninteresting cases, two threads with the same ->tgid will have the same ->files pointer, so keeping them both for comparison brings no benefit. Acked-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: NeilBrown <neilb@suse.com> Reviewed-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2016-10-07mm: remove page_file_indexHuang Ying1-1/+1
After using the offset of the swap entry as the key of the swap cache, the page_index() becomes exactly same as page_file_index(). So the page_file_index() is removed and the callers are changed to use page_index() instead. Link: http://lkml.kernel.org/r/1473270649-27229-2-git-send-email-ying.huang@intel.com Signed-off-by: "Huang, Ying" <ying.huang@intel.com> Cc: Trond Myklebust <trond.myklebust@primarydata.com> Cc: Anna Schumaker <anna.schumaker@netapp.com> Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> Cc: Michal Hocko <mhocko@suse.com> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Dan Williams <dan.j.williams@intel.com> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: Ross Zwisler <ross.zwisler@linux.intel.com> Cc: Eric Dumazet <edumazet@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-05-17NFS: Add nfs_commit_file()Anna Schumaker1-2/+4
Copy will use this to set up a commit request for a generic range. I don't want to allocate a new pagecache entry for the file, so I needed to change parts of the commit path to handle requests with a null wb_page. Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2016-04-04mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macrosKirill A. Shutemov1-3/+3
PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time ago with promise that one day it will be possible to implement page cache with bigger chunks than PAGE_SIZE. This promise never materialized. And unlikely will. We have many places where PAGE_CACHE_SIZE assumed to be equal to PAGE_SIZE. And it's constant source of confusion on whether PAGE_CACHE_* or PAGE_* constant should be used in a particular case, especially on the border between fs and mm. Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much breakage to be doable. Let's stop pretending that pages in page cache are special. They are not. The changes are pretty straight-forward: - <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>; - <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>; - PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN}; - page_cache_get() -> get_page(); - page_cache_release() -> put_page(); This patch contains automated changes generated with coccinelle using script below. For some reason, coccinelle doesn't patch header files. I've called spatch for them manually. The only adjustment after coccinelle is revert of changes to PAGE_CAHCE_ALIGN definition: we are going to drop it later. There are few places in the code where coccinelle didn't reach. I'll fix them manually in a separate patch. Comments and documentation also will be addressed with the separate patch. virtual patch @@ expression E; @@ - E << (PAGE_CACHE_SHIFT - PAGE_SHIFT) + E @@ expression E; @@ - E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) + E @@ @@ - PAGE_CACHE_SHIFT + PAGE_SHIFT @@ @@ - PAGE_CACHE_SIZE + PAGE_SIZE @@ @@ - PAGE_CACHE_MASK + PAGE_MASK @@ expression E; @@ - PAGE_CACHE_ALIGN(E) + PAGE_ALIGN(E) @@ expression E; @@ - page_cache_get(E) + get_page(E) @@ expression E; @@ - page_cache_release(E) + put_page(E) Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Acked-by: Michal Hocko <mhocko@suse.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-01-08NFS: Fix a compile warning about unused variable in nfs_generic_pg_pgios()Trond Myklebust1-3/+0
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2016-01-07NFS: Use wait_on_atomic_t() for unlock after readaheadBenjamin Coddington1-41/+7
The use of wait_on_atomic_t() for waiting on I/O to complete before unlocking allows us to git rid of the NFS_IO_INPROGRESS flag, and thus the nfs_iocounter's flags member, and finally the nfs_iocounter altogether. The count of I/O is moved to the lock context, and the counter increment/decrement functions become simple enough to open-code. Signed-off-by: Benjamin Coddington <bcodding@redhat.com> [Trond: Fix up conflict with existing function nfs_wait_atomic_killable()] Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
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