linux.git/include/linux/nfs_page.h, branch v6.1

NFS: Improve write error tracing

2022-08-09T18:11:34+00:00

Don't leak request pointers, but use the "device:inode" labelling that
is used by all the other trace points. Furthermore, replace use of page
indexes with an offset, again in order to align behaviour with other
NFS trace points.

Signed-off-by: Trond Myklebust

pNFS/flexfiles: Fix array overflow when flexfiles mirroring is enabled

2020-11-30T15:52:22+00:00

If the flexfiles mirroring is enabled, then the read code expects to be
able to set pgio->pg_mirror_idx to point to the data server that is
being used for this particular read. However it does not change the
pg_mirror_count because we only need to send a single read.

Signed-off-by: Trond Myklebust 
Signed-off-by: Anna Schumaker

NFS: Try to join page groups before an O_DIRECT retransmission

2020-04-01T17:37:57+00:00

If we have to retransmit requests, try to join their page groups
first.

Signed-off-by: Trond Myklebust

NFS: Refactor nfs_lock_and_join_requests()

2020-04-01T17:37:56+00:00

Refactor nfs_lock_and_join_requests() in order to separate out the
subrequest merging into its own function nfs_lock_and_join_group()
that can be used by O_DIRECT.

Signed-off-by: Trond Myklebust

NFS: Clean up nfs_lock_and_join_requests()

2020-04-01T17:37:56+00:00

Clean up nfs_lock_and_join_requests() to simplify the calculation
of the range covered by the page group, taking into account the
presence of mirrors.

Signed-off-by: Trond Myklebust

NFS: Fix races nfs_page_group_destroy() vs nfs_destroy_unlinked_subrequests()

2020-04-01T17:34:28+00:00

When a subrequest is being detached from the subgroup, we want to
ensure that it is not holding the group lock, or in the process
of waiting for the group lock.

Fixes: 5b2b5187fa85 ("NFS: Fix nfs_page_group_destroy() and nfs_lock_and_join_requests() race cases")
Signed-off-by: Trond Myklebust

NFS: Remove redundant open context from nfs_page

2019-04-25T18:18:15+00:00

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 
Signed-off-by: Anna Schumaker

NFS: Add a helper to return a pointer to the open context of a struct nfs_page

2019-04-25T18:18:15+00:00

Add a helper for when we remove the explicit pointer to the open
context.

Signed-off-by: Trond Myklebust 
Signed-off-by: Anna Schumaker

pNFS: Add tracking to limit the number of pNFS retries

2019-04-25T18:18:14+00:00

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 
Signed-off-by: Anna Schumaker

NFS: Remove unused argument from nfs_create_request()

2019-04-25T18:18:14+00:00

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 
Signed-off-by: Anna Schumaker