kernel/linux.git/fs/nfs/pnfs_dev.c, branch linux-6.0.y

NFSv4/pnfs: Add tracing for the deviceid cache

2020-12-16T22:25:24+00:00

Add tracepoints to allow debugging of the deviceid cache. Signed-off-by: Trond Myklebust

NFS/flexfiles: Speed up read failover when DSes are down

2019-03-02T03:37:38+00:00

If we notice that a DS may be down, we should attempt to read from the other mirrors first before we go back to retry the dead DS. Signed-off-by: Trond Myklebust

NFSv4/pnfs: Fix barriers in nfs4_mark_deviceid_unavailable()

2019-03-01T21:20:16+00:00

Fix the memory barriers in nfs4_mark_deviceid_unavailable() and nfs4_test_deviceid_unavailable(). Signed-off-by: Trond Myklebust

NFS/NFSD/SUNRPC: replace generic creds with 'struct cred'.

2018-12-19T18:52:46+00:00

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 Acked-by: J. Bruce Fields Signed-off-by: Anna Schumaker

pnfs/blocklayout: handle transient devices

2018-01-15T04:06:29+00:00

PNFS block/SCSI layouts should gracefully handle cases where block devices are not available when a layout is retrieved, or the block devices are removed while the client holds a layout. While setting up a layout segment, keep a record of an unavailable or un-parsable block device in cache with a flag so that subsequent layouts do not spam the server with GETDEVINFO. We can reuse the current NFS_DEVICEID_UNAVAILABLE handling with one variation: instead of reusing the device, we will discard it and send a fresh GETDEVINFO after the timeout, since the lookup and validation of the device occurs within the GETDEVINFO response handling. A lookup of a layout segment that references an unavailable device will return a segment with the NFS_LSEG_UNAVAILABLE flag set. This will allow the pgio layer to mark the layout with the appropriate fail bit, which forces subsequent IO to the MDS, and prevents spamming the server with LAYOUTGET, LAYOUTRETURN. Finally, when IO to a block device fails, look up the block device(s) referenced by the pgio header, and mark them as unavailable. Signed-off-by: Benjamin Coddington Signed-off-by: Trond Myklebust

NFSv4.1: Don't cache deviceids that have no notifications

2015-03-27T16:32:24+00:00

The spec says that once all layouts that reference a given deviceid have been returned, then we are only allowed to continue to cache the deviceid if the metadata server supports notifications. Signed-off-by: Trond Myklebust

NFSv4.1: Cleanup - don't opencode nfs4_put_deviceid_node()

2015-03-27T16:32:24+00:00

There really is no reason to do so. Signed-off-by: Trond Myklebust

NFSv4.1: Convert pNFS deviceid to use kfree_rcu()

2015-03-27T16:32:24+00:00

Use of synchronize_rcu() when unmounting and potentially freeing a lot of deviceids is problematic. There really is no reason why we can't just use kfree_rcu() here. Signed-off-by: Trond Myklebust

pnfs: remove GETDEVICELIST implementation

2014-09-12T17:20:54+00:00

The current GETDEVICELIST implementation is buggy in that it doesn't handle cursors correctly, and in that it returns an error if the server returns NFSERR_NOTSUPP. Given that there is no actual need for GETDEVICELIST, it has various issues and might get removed for NFSv4.2 stop using it in the blocklayout driver, and thus the Linux NFS client as whole. Signed-off-by: Christoph Hellwig Signed-off-by: Trond Myklebust

pnfs: add a common GETDEVICELIST implementation

2014-09-10T19:47:04+00:00

At a simple helper to issue a GETDEVICELIST operation and pre-load the device id cache based on the result. Signed-off-by: Christoph Hellwig Signed-off-by: Trond Myklebust