kernel/git/stable/linux.git/net/9p/client.c, branch linux-3.2.y

net/9p: Switch to wait_event_killable()

2018-02-13T18:32:10+00:00

commit 9523feac272ccad2ad8186ba4fcc89103754de52 upstream. Because userspace gets Very Unhappy when calls like stat() and execve() return -EINTR on 9p filesystem mounts. For instance, when bash is looking in PATH for things to execute and some SIGCHLD interrupts stat(), bash can throw a spurious 'command not found' since it doesn't retry the stat(). In practice, hitting the problem is rare and needs a really slow/bogged down 9p server. Signed-off-by: Tuomas Tynkkynen Signed-off-by: Al Viro [bwh: Backported to 3.2: - Drop changes in trans_xen.c - Adjust context] Signed-off-by: Ben Hutchings

p9_client_readdir() fix

2017-07-18T17:38:43+00:00

commit 71d6ad08379304128e4bdfaf0b4185d54375423e upstream. Don't assume that server is sane and won't return more data than asked for. Signed-off-by: Al Viro Signed-off-by: Ben Hutchings

9p: forgetting to cancel request on interrupted zero-copy RPC

2015-08-12T14:33:19+00:00

commit a84b69cb6e0a41e86bc593904faa6def3b957343 upstream. If we'd already sent a request and decide to abort it, we *must* issue TFLUSH properly and not just blindly reuse the tag, or we'll get seriously screwed when response eventually arrives and we confuse it for response to later request that had reused the same tag. Signed-off-by: Al Viro Signed-off-by: Ben Hutchings

net/9p: Convert net/9p protocol dumps to tracepoints

2011-10-24T16:13:12+00:00

This helps in more control over debugging. root@qemu-img-64:~# ls /pass/123 ls: cannot access /pass/123: No such file or directory root@qemu-img-64:~# cat /sys/kernel/debug/tracing/trace # tracer: nop # # TASK-PID CPU# TIMESTAMP FUNCTION # | | | | | ls-1536 [001] 70.928584: 9p_protocol_dump: clnt 18446612132784021504 P9_TWALK(tag = 1) 000: 16 00 00 00 6e 01 00 01 00 00 00 02 00 00 00 01 010: 00 03 00 31 32 33 00 00 00 ff ff ff ff 00 00 00 ls-1536 [001] 70.928587: => trace_9p_protocol_dump => p9pdu_finalize => p9_client_rpc => p9_client_walk => v9fs_vfs_lookup => d_alloc_and_lookup => walk_component => path_lookupat ls-1536 [000] 70.929696: 9p_protocol_dump: clnt 18446612132784021504 P9_RLERROR(tag = 1) 000: 0b 00 00 00 07 01 00 02 00 00 00 4e 03 00 02 00 010: 00 00 00 00 03 00 02 00 00 00 00 00 ff 43 00 00 ls-1536 [000] 70.929697: => trace_9p_protocol_dump => p9_client_rpc => p9_client_walk => v9fs_vfs_lookup => d_alloc_and_lookup => walk_component => path_lookupat => do_path_lookup Signed-off-by: Aneesh Kumar K.V Signed-off-by: Eric Van Hensbergen

fs/9p: change an int to unsigned int

2011-10-24T16:13:12+00:00

Without this msize=4294967295 will result in a crash Signed-off-by: Dan Carpenter Signed-off-by: Aneesh Kumar K.V Signed-off-by: Eric Van Hensbergen

fs/9p: Cleanup option parsing in 9p

2011-10-24T16:13:12+00:00

Instead of saying all integer argument option should be listed in the beginning move integer parsing to each option type. Signed-off-by: Aneesh Kumar K.V Signed-off-by: Eric Van Hensbergen

9p: move dereference after NULL check

2011-10-24T16:13:11+00:00

We dereferenced "req->tc" and "req->rc" before checking for NULL. Signed-off-by: Dan Carpenter Signed-off-by: Aneesh Kumar K.V Signed-off-by: Eric Van Hensbergen

fs/9p: Update zero-copy implementation in 9p

2011-10-24T16:13:11+00:00

* remove lot of update to different data structure * add a seperate callback for zero copy request. * above makes non zero copy code path simpler * remove conditionalizing TREAD/TREADDIR/TWRITE in the zero copy path * Fix the dotu p9_check_errors with zero copy. Add sufficient doc around * Add support for both in and output buffers in zero copy callback * pin and unpin pages in the same context * use helpers instead of defining page offset and rest of page ourself * Fix mem leak in p9_check_errors * Remove 'E' and 'F' in p9pdu_vwritef Signed-off-by: Aneesh Kumar K.V Signed-off-by: Eric Van Hensbergen

net/9p: Fix the msize calculation.

2011-07-23T14:32:52+00:00

msize represents the maximum PDU size that includes P9_IOHDRSZ. Signed-off-by: Venkateswararao Jujjuri " Signed-off-by: Aneesh Kumar K.V Signed-off-by: Eric Van Hensbergen

fs/9p: add 9P2000.L unlinkat operation

2011-07-23T14:32:52+00:00

unlinkat - Remove a directory entry size[4] Tunlinkat tag[2] dirfid[4] name[s] flag[4] size[4] Runlinkat tag[2] older Tremove have the below request format size[4] Tremove tag[2] fid[4] The remove message is used to remove a directory entry either file or directory The remove opreation is actually a directory opertation and should ideally have dirfid, if not we cannot represent the fid on server with anything other than name. We will have to derive the directory name from fid in the Tremove request. NOTE: The operation doesn't clunk the unlink fid. Signed-off-by: Aneesh Kumar K.V Signed-off-by: Eric Van Hensbergen