linux-stable.git/net/9p, branch v3.2

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 kernel crash with msize 512K

2011-09-06T13:17:15+00:00

With msize equal to 512K (PAGE_SIZE * VIRTQUEUE_NUM), we hit multiple
crashes. This patch fix those.

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

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

2011-07-23T14:32:51+00:00

renameat - change name of file or directory

size[4] Trenameat tag[2] olddirfid[4] oldname[s] newdirfid[4] newname[s]
size[4] Rrenameat tag[2]

older Trename have the below request format

size[4] Trename tag[2] fid[4] newdirfid[4] name[s]

The rename message is used to change the name of a file, possibly moving it
to a new directory. The rename opreation is actually a directory opertation
and should ideally have olddirfid, if not we cannot represent the fid on server
with anything other than name. We will have to derive the old directory name
from fid in the Trename request.

Signed-off-by: Aneesh Kumar K.V 
Signed-off-by: Eric Van Hensbergen

fs/9p: Clean-up get_protocol_version() to use strcmp

2011-07-23T14:32:49+00:00

Signed-off-by: Prem Karat 
Signed-off-by: Aneesh Kumar K.V 
Signed-off-by: Eric Van Hensbergen