- 20 Apr, 2017 39 commits
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Trond Myklebust authored
If the server fails to return the attributes as part of an OPEN reply, and then reboots, we can end up hanging. The reason is that the client attempts to send a GETATTR in order to pick up the missing OPEN call, but fails to release the slot first, causing reboot recovery to deadlock. Signed-off-by:
Trond Myklebust <trond.myklebust@primarydata.com> Fixes: 2e80dbe7 ("NFSv4.1: Close callback races for OPEN, LAYOUTGET...") Cc: stable@vger.kernel.org # v4.8+
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Benjamin Coddington authored
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:
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Benjamin Coddington authored
Since commit 00bfa30a ("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:
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Benjamin Coddington authored
Prevent a deadlock that can occur if we wait on allocations that try to write back our pages. Signed-off-by:
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Fred Isaman authored
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Fred Isaman <fred.isaman@gmail.com> Fixes: 0bcbf039 ("nfs: handle request add failure properly") Cc: stable@vger.kernel.org # v4.5+ Signed-off-by:
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Benjamin Coddington authored
Commit a7d42ddb ("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:
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NeilBrown authored
When mempool_alloc() is allowed to sleep (GFP_NOIO allows sleeping) it cannot fail. So rpc_alloc_task() cannot fail, so rpc_new_task doesn't need to test for failure. Consequently rpc_new_task() cannot fail, so the callers don't need to test. Signed-off-by:
NeilBrown <neilb@suse.com> Signed-off-by:
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NeilBrown authored
When passed GFP flags that allow sleeping (such as GFP_NOIO), mempool_alloc() will never return NULL, it will wait until memory is available. This means that we don't need to handle failure, but that we do need to ensure one thread doesn't call mempool_alloc() twice on the one pool without queuing or freeing the first allocation. If multiple threads did this during times of high memory pressure, the pool could be exhausted and a deadlock could result. pnfs_generic_alloc_ds_commits() attempts to allocate from the nfs_commit_mempool while already holding an allocation from that pool. This is not safe. So change nfs_commitdata_alloc() to take a flag that indicates whether failure is acceptable. In pnfs_generic_alloc_ds_commits(), accept failure and handle it as we currently do. Else where, do not accept failure, and do not handle it. Even when failure is acceptable, we want to succeed if possible. That means both - using an entry from the pool if there is one - waiting for direct reclaim is there isn't. We call mempool_alloc(GFP_NOWAIT) to achieve the first, then kmem_cache_alloc(GFP_NOIO|__GFP_NORETRY) to achieve the second. Each of these can fail, but together they do the best they can without blocking indefinitely. The objects returned by kmem_cache_alloc() will still be freed by mempool_free(). This is safe as mempool_alloc() uses exactly the same function to allocate objects (since the mempool was created with mempool_create_slab_pool()). The object returned by mempool_alloc() and kmem_cache_alloc() are indistinguishable so mempool_free() will handle both identically, either adding to the pool or calling kmem_cache_free(). Also, don't test for failure when allocating from nfs_wdata_mempool. Signed-off-by:
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Anna Schumaker authored
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Anna Schumaker <Anna.Schumaker@Netapp.com> Signed-off-by:
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Anna Schumaker authored
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Anna Schumaker authored
Returning errors directly even lets us remove the goto Signed-off-by:
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Anna Schumaker authored
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Anna Schumaker authored
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Anna Schumaker authored
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Anna Schumaker authored
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Anna Schumaker authored
If we cut out the dprintk()s, then we can return error codes directly and cut out the goto. Signed-off-by:
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Anna Schumaker authored
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Anna Schumaker authored
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Anna Schumaker authored
This puts all the common code in a single place for the walk_client_list() functions. Signed-off-by:
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Anna Schumaker authored
Once again, we can remove the function and compare integer values directly. Signed-off-by:
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Anna Schumaker authored
If we cut out the dprintk()s, then we don't even need this to be a separate function. Signed-off-by:
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Anna Schumaker authored
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Anna Schumaker authored
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Anna Schumaker authored
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Anna Schumaker authored
Just remove the function and have the caller use nfs_release_request() instead. Signed-off-by:
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Anna Schumaker authored
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Anna Schumaker authored
We always call nfs_mark_client_ready() even if nfs_create_rpc_client() returns an error, so we can rearrange nfs_init_client() to mark the client ready from a single place. Signed-off-by:
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Anna Schumaker authored
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Anna Schumaker authored
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Anna Schumaker authored
Let's cut out the goto and return any errors immedately Signed-off-by:
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Anna Schumaker authored
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Anna Schumaker authored
Additionally, this change lets us cut out the goto by returning errors immediately. Signed-off-by:
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Anna Schumaker authored
Removing the dprintk() lets us simplify the function by returning status codes directly, rather than using a goto. Signed-off-by:
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Anna Schumaker authored
Removing the dprintk() lets us return the status value directly, rather than jumping to a label if an error occurs. Signed-off-by:
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Anna Schumaker authored
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Anna Schumaker authored
In addition to removing the dprintk(), this patch also initializes "res" to the default return value instead of doing this through an else condition. Signed-off-by:
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Anna Schumaker authored
Removing the dprintk()s lets us simplify the function by removing the else condition entirely and returning the status of initiate_{file,bulk}_draining() directly. Signed-off-by: -
Tigran Mkrtchyan authored
Flexfilelayout supports data servers which talk NFS v3 and v4.{0,1,2}. However, this code path is disabled and v3 only servers are accepted. This change removes this limitation. Signed-off-by:Tigran Mkrtchyan <tigran.mkrtchyan@desy.de> Signed-off-by:
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Benjamin Coddington authored
NFS has some optimizations for readdir to choose between using READDIR or READDIRPLUS based on workload, and which NFS operation to use is determined by subsequent interactions with lookup, d_revalidate, and getattr. Concurrent use of nfs_readdir() via ->iterate_shared() can cause those optimizations to repeatedly invalidate the pagecache used to store directory entries during readdir(), which causes some very bad performance for directories with many entries (more than about 10000). There's a couple ways to fix this in NFS, but no fix would be as simple as going back to ->iterate() to serialize nfs_readdir(), and neither fix I tested performed as well as going back to ->iterate(). The first required taking the directory's i_lock for each entry, with the result of terrible contention. The second way adds another flag to the nfs_inode, and so keeps the optimizations working for large directories. The difference from using ->iterate() here is that much more memory is consumed for a given workload without any performance gain. The workings of nfs_readdir() are such that concurrent users are serialized within read_cache_page() waiting to retrieve pages of entries from the server. By serializing this work in iterate_dir() instead, contention for cache pages is reduced. Waiting processes can have an uncontended pass at the entirety of the directory's pagecache once previous processes have completed filling it. v2 - Keep the bits needed for parallel lookup Signed-off-by:
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- 16 Apr, 2017 1 commit
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Linus Torvalds authored
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