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author | Linus Torvalds <torvalds@linux-foundation.org> | 2020-10-22 09:44:27 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-10-22 09:44:27 -0700 |
commit | 24717cfbbbbfa415d1e3dca0f21c417e5faf8208 (patch) | |
tree | 8fafaa269b3e5fde06ebc9bedd8c7a9ffd20b816 /Documentation/admin-guide | |
parent | 9b06f57b9edb2d67471e626b3ebd247826729a7f (diff) | |
parent | 0cfcd405e758ba1d277e58436fb32f06888c3e41 (diff) | |
download | linux-24717cfbbbbfa415d1e3dca0f21c417e5faf8208.tar.bz2 |
Merge tag 'nfsd-5.10' of git://linux-nfs.org/~bfields/linux
Pull nfsd updates from Bruce Fields:
"The one new feature this time, from Anna Schumaker, is READ_PLUS,
which has the same arguments as READ but allows the server to return
an array of data and hole extents.
Otherwise it's a lot of cleanup and bugfixes"
* tag 'nfsd-5.10' of git://linux-nfs.org/~bfields/linux: (43 commits)
NFSv4.2: Fix NFS4ERR_STALE error when doing inter server copy
SUNRPC: fix copying of multiple pages in gss_read_proxy_verf()
sunrpc: raise kernel RPC channel buffer size
svcrdma: fix bounce buffers for unaligned offsets and multiple pages
nfsd: remove unneeded break
net/sunrpc: Fix return value for sysctl sunrpc.transports
NFSD: Encode a full READ_PLUS reply
NFSD: Return both a hole and a data segment
NFSD: Add READ_PLUS hole segment encoding
NFSD: Add READ_PLUS data support
NFSD: Hoist status code encoding into XDR encoder functions
NFSD: Map nfserr_wrongsec outside of nfsd_dispatch
NFSD: Remove the RETURN_STATUS() macro
NFSD: Call NFSv2 encoders on error returns
NFSD: Fix .pc_release method for NFSv2
NFSD: Remove vestigial typedefs
NFSD: Refactor nfsd_dispatch() error paths
NFSD: Clean up nfsd_dispatch() variables
NFSD: Clean up stale comments in nfsd_dispatch()
NFSD: Clean up switch statement in nfsd_dispatch()
...
Diffstat (limited to 'Documentation/admin-guide')
-rw-r--r-- | Documentation/admin-guide/nfs/fault_injection.rst | 70 | ||||
-rw-r--r-- | Documentation/admin-guide/nfs/index.rst | 1 |
2 files changed, 0 insertions, 71 deletions
diff --git a/Documentation/admin-guide/nfs/fault_injection.rst b/Documentation/admin-guide/nfs/fault_injection.rst deleted file mode 100644 index eb029c0c15ce..000000000000 --- a/Documentation/admin-guide/nfs/fault_injection.rst +++ /dev/null @@ -1,70 +0,0 @@ -=================== -NFS Fault Injection -=================== - -Fault injection is a method for forcing errors that may not normally occur, or -may be difficult to reproduce. Forcing these errors in a controlled environment -can help the developer find and fix bugs before their code is shipped in a -production system. Injecting an error on the Linux NFS server will allow us to -observe how the client reacts and if it manages to recover its state correctly. - -NFSD_FAULT_INJECTION must be selected when configuring the kernel to use this -feature. - - -Using Fault Injection -===================== -On the client, mount the fault injection server through NFS v4.0+ and do some -work over NFS (open files, take locks, ...). - -On the server, mount the debugfs filesystem to <debug_dir> and ls -<debug_dir>/nfsd. This will show a list of files that will be used for -injecting faults on the NFS server. As root, write a number n to the file -corresponding to the action you want the server to take. The server will then -process the first n items it finds. So if you want to forget 5 locks, echo '5' -to <debug_dir>/nfsd/forget_locks. A value of 0 will tell the server to forget -all corresponding items. A log message will be created containing the number -of items forgotten (check dmesg). - -Go back to work on the client and check if the client recovered from the error -correctly. - - -Available Faults -================ -forget_clients: - The NFS server keeps a list of clients that have placed a mount call. If - this list is cleared, the server will have no knowledge of who the client - is, forcing the client to reauthenticate with the server. - -forget_openowners: - The NFS server keeps a list of what files are currently opened and who - they were opened by. Clearing this list will force the client to reopen - its files. - -forget_locks: - The NFS server keeps a list of what files are currently locked in the VFS. - Clearing this list will force the client to reclaim its locks (files are - unlocked through the VFS as they are cleared from this list). - -forget_delegations: - A delegation is used to assure the client that a file, or part of a file, - has not changed since the delegation was awarded. Clearing this list will - force the client to reacquire its delegation before accessing the file - again. - -recall_delegations: - Delegations can be recalled by the server when another client attempts to - access a file. This test will notify the client that its delegation has - been revoked, forcing the client to reacquire the delegation before using - the file again. - - -tools/nfs/inject_faults.sh script -================================= -This script has been created to ease the fault injection process. This script -will detect the mounted debugfs directory and write to the files located there -based on the arguments passed by the user. For example, running -`inject_faults.sh forget_locks 1` as root will instruct the server to forget -one lock. Running `inject_faults forget_locks` will instruct the server to -forgetall locks. diff --git a/Documentation/admin-guide/nfs/index.rst b/Documentation/admin-guide/nfs/index.rst index 6b5a3c90fac5..3601a708f333 100644 --- a/Documentation/admin-guide/nfs/index.rst +++ b/Documentation/admin-guide/nfs/index.rst @@ -12,4 +12,3 @@ NFS nfs-idmapper pnfs-block-server pnfs-scsi-server - fault_injection |