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2014-07-159P: remove unnecessary break after returnFabian Frederick1-1/+0
Signed-off-by: Fabian Frederick <fabf@skynet.be> Signed-off-by: David S. Miller <davem@davemloft.net>
2014-03-259P: Get rid of REQ_STATUS_FLSHSimon Derr1-1/+1
This request state is mostly useless, and properly implementing it for RDMA would require an extra lock to be taken in handle_recv() and in rdma_cancel() to avoid this race: handle_recv() rdma_cancel() . . . if req->state == SENT req->state = RCVD . . req->state = FLSH So just get rid of it. Signed-off-by: Simon Derr <simon.derr@bull.net> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2014-03-259P: Add cancelled() to the transport functions.Simon Derr1-6/+3
And move transport-specific code out of net/9p/client.c Signed-off-by: Simon Derr <simon.derr@bull.net> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2014-03-25net: Mark function as static in 9p/client.cRashika1-1/+1
Mark function as static in net/9p/client.c because it is not used outside this file. This eliminates the following warning in net/9p/client.c: net/9p/client.c:207:18: warning: no previous prototype for ‘p9_fcall_alloc’ [-Wmissing-prototypes] Signed-off-by: Rashika Kheria <rashika.kheria@gmail.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2014-03-259P: Add memory barriers to protect request fields over cb/rpc threads handoffDominique Martinet1-1/+15
We need barriers to guarantee this pattern works as intended: [w] req->rc, 1 [r] req->status, 1 wmb rmb [w] req->status, 1 [r] req->rc Where the wmb ensures that rc gets written before status, and the rmb ensures that if you observe status == 1, rc is the new value. Signed-off-by: Dominique Martinet <dominique.martinet@cea.fr> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2013-11-23net/9p: remove virtio default hack and set appropriate bits insteadEric Van Hensbergen1-3/+0
A few releases back a patch made virtio the default transport, however it was done in a way which side-stepped the mechanism put in place to allow for this selection. This patch cleans that up while maintaining virtio as the default transport. Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2013-09-11Merge tag 'for-linus-3.12-merge' of git://git.kernel.org/pub/scm/linux/kernel/git/ericvh/v9fsLinus Torvalds1-0/+5
Pull 9p updates from Eric Van Hensbergen: "Minor 9p fixes and tweaks for 3.12 merge window The first fixes namespace issues which causes a kernel NULL pointer dereference, the second fixes uevent handling to work better with udev, and the third switches some code to use srlcpy instead of strncpy in order to be safer. All changes have been baking in for-next for at least 2 weeks" * tag 'for-linus-3.12-merge' of git://git.kernel.org/pub/scm/linux/kernel/git/ericvh/v9fs: fs/9p: avoid accessing utsname after namespace has been torn down 9p: send uevent after adding/removing mount_tag attribute fs: 9p: use strlcpy instead of strncpy
2013-08-26fs/9p: avoid accessing utsname after namespace has been torn downWill Deacon1-0/+5
During trinity fuzzing in a kvmtool guest, I stumbled across the following: Unable to handle kernel NULL pointer dereference at virtual address 00000004 PC is at v9fs_file_do_lock+0xc8/0x1a0 LR is at v9fs_file_do_lock+0x48/0x1a0 [<c01e2ed0>] (v9fs_file_do_lock+0xc8/0x1a0) from [<c0119154>] (locks_remove_flock+0x8c/0x124) [<c0119154>] (locks_remove_flock+0x8c/0x124) from [<c00d9bf0>] (__fput+0x58/0x1e4) [<c00d9bf0>] (__fput+0x58/0x1e4) from [<c0044340>] (task_work_run+0xac/0xe8) [<c0044340>] (task_work_run+0xac/0xe8) from [<c002e36c>] (do_exit+0x6bc/0x8d8) [<c002e36c>] (do_exit+0x6bc/0x8d8) from [<c002e674>] (do_group_exit+0x3c/0xb0) [<c002e674>] (do_group_exit+0x3c/0xb0) from [<c002e6f8>] (__wake_up_parent+0x0/0x18) I believe this is due to an attempt to access utsname()->nodename, after exit_task_namespaces() has been called, leaving current->nsproxy->uts_ns as NULL and causing the above dereference. A similar issue was fixed for lockd in 9a1b6bf818e7 ("LOCKD: Don't call utsname()->nodename from nlmclnt_setlockargs"), so this patch attempts something similar for 9pfs. Cc: Eric Van Hensbergen <ericvh@gmail.com> Cc: Ron Minnich <rminnich@sandia.gov> Cc: Latchesar Ionkov <lucho@ionkov.net> Cc: Trond Myklebust <Trond.Myklebust@netapp.com> Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2013-07-309p: client: remove unused code and any reference to "cancelled" functionAndi Shyti1-7/+2
This patch reverts commit 80b45261a0b263536b043c5ccfc4ba4fc27c2acc which was implementing a 'cancelled' functionality to notify that a cancelled request will not be replied. This implementation was not used anywhere and therefore removed. Signed-off-by: Andi Shyti <andi@etezian.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2013-07-079P: Add cancelled() to the transport functions.Simon Derr1-3/+9
RDMA needs to post a buffer for each incoming reply. Hence it needs to keep count of these and needs to be aware of whether a flushed request has received a reply or not. This patch adds the cancelled() callback to the transport modules. It is called when RFLUSH has been received and that the corresponding request will never receive a reply. Signed-off-by: Simon Derr <simon.derr@bull.net> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2013-07-079P/RDMA: count posted buffers without a pending requestSimon Derr1-2/+4
In rdma_request(): If an error occurs between posting the recv and the send, there will be a reply context posted without a pending request. Since there is no way to "un-post" it, we remember it and skip post_recv() for the next request. Signed-off-by: Simon Derr <simon.derr@bull.net> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2013-07-079pnet: refactor struct p9_fcall alloc codeSimon Derr1-17/+18
Signed-off-by: Simon Derr <simon.derr@bull.net> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2013-07-079P: Fix fcall allocation for rdmaSimon Derr1-16/+23
The current code assumes that when a request in the request array does have a tc, it also has a rc. This is normally true, but not always : when using RDMA, req->rc will temporarily be set to NULL after the request has been sent. That is usually OK though, as when the reply arrives, req->rc will be reassigned to a sane value before the request is recycled. But there is a catch : if the request is flushed, the reply will never arrive, and req->rc will be NULL, but not req->tc. This patch fixes p9_tag_alloc to take this into account. Signed-off-by: Simon Derr <simon.derr@bull.net> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2013-05-28net/9p: Handle error in zero copy request correctly for 9p2000.uAneesh Kumar K.V1-37/+18
For zero copy request, error will be encoded in the user space buffer. So copy the error code correctly using copy_from_user. Here we use the extra bytes we allocate for zero copy request. If total error details are more than P9_ZC_HDR_SZ - 7 bytes, we return -EFAULT. The patch also avoid a memory allocation in the error path. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2013-05-28net/9p: Use virtio transpart as the default transportAneesh Kumar K.V1-0/+3
Make the default 9p experience better by defaulting to virtio transport if present. These days most of the users are using 9p in a virtualized setup Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2013-05-28net/9p: Make 9P2000.L the default protocol for 9p file systemAneesh Kumar K.V1-1/+1
If we dont' specify a protocol version default to 9P2000.L. 9P2000.L have better support for posix semantic and is where all the recent development is happening. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2013-02-129p: Modify the stat structures to use kuid_t and kgid_tEric W. Biederman1-5/+13
9p has thre strucrtures that can encode inode stat information. Modify all of those structures to contain kuid_t and kgid_t values. Modify he wire encoders and decoders of those structures to use 'u' and 'g' instead of 'd' in the format string where uids and gids are present. This results in all kuid and kgid conversion to and from on the wire values being performed by the same code in protocol.c where the client is known at the time of the conversion. Cc: Eric Van Hensbergen <ericvh@gmail.com> Cc: Ron Minnich <rminnich@gmail.com> Cc: Latchesar Ionkov <lucho@ionkov.net> Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
2013-02-129p: Transmit kuid and kgid valuesEric W. Biederman1-12/+13
Modify the p9_client_rpc format specifiers of every function that directly transmits a uid or a gid from 'd' to 'u' or 'g' as appropriate. Modify those same functions to take kuid_t and kgid_t parameters instead of uid_t and gid_t parameters. Cc: Eric Van Hensbergen <ericvh@gmail.com> Cc: Ron Minnich <rminnich@gmail.com> Cc: Latchesar Ionkov <lucho@ionkov.net> Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
2012-09-06net/9p: Check errno validitySimon Derr1-2/+16
While working on a modified server I had the Linux clients crash a few times. This lead me to find this: Some error codes are directly extracted from the server replies. A malformed server reply could contain an invalid error code, with a very large value. If this value is then passed to ERR_PTR() it will not be properly detected as an error code by IS_ERR() and as a result the kernel will dereference an invalid pointer. This patch tries to avoid this. Signed-off-by: Simon Derr <simon.derr@bull.net> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2012-06-04net/9p: Add __force to cast of __user pointerJoe Perches1-1/+1
A recent commit that removed unnecessary casts of pointers to the same type uncovered a missing __force cast. Add it. Reported by: Ben Hutchings <bhutchings@solarflare.com> Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-06-04net: Remove casts to same typeJoe Perches1-1/+1
Adding casts of objects to the same type is unnecessary and confusing for a human reader. For example, this cast: int y; int *p = (int *)&y; I used the coccinelle script below to find and remove these unnecessary casts. I manually removed the conversions this script produces of casts with __force and __user. @@ type T; T *p; @@ - (T *)p + p Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-04-15net: cleanup unsigned to unsigned intEric Dumazet1-3/+3
Use of "unsigned int" is preferred to bare "unsigned" in net tree. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-02-26net/9p: handle flushed Tclunk/TremoveJim Garlick1-3/+15
When a Tclunk or Tremove request is flushed, the fid is not freed on the server. p9_client_clunk() should retry once on interrupt, then if interrupted again, leak the fid for the duration of the connection. p9_client_remove() should call p9_client_clunk() on interrupt instead of unconditionally destroying the fid. Signed-off-by: Jim Garlick <garlick@llnl.gov> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2012-02-26net/9p: don't allow Tflush to be interruptedJim Garlick1-0/+8
When a signal is received while sending a Tflush, the client, which has recursed into p9_client_rpc() while sending another request, should wait for Rflush as long as the transport is still up. Signed-off-by: Jim Garlick <garlick@llnl.gov> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2012-01-059p: Reduce object size with CONFIG_NET_9P_DEBUGJoe Perches1-121/+121
Reduce object size by deduplicating formats. Use vsprintf extension %pV. Rename P9_DPRINTK uses to p9_debug, align arguments. Add function for _p9_debug and macro to add __func__. Add missing "\n"s to p9_debug uses. Remove embedded function names as p9_debug adds it. Remove P9_EPRINTK macro and convert use to pr_<level>. Add and use pr_fmt and pr_<level>. $ size fs/9p/built-in.o* text data bss dec hex filename 62133 984 16000 79117 1350d fs/9p/built-in.o.new 67342 984 16928 85254 14d06 fs/9p/built-in.o.old $ size net/9p/built-in.o* text data bss dec hex filename 88792 4148 22024 114964 1c114 net/9p/built-in.o.new 94072 4148 23232 121452 1da6c net/9p/built-in.o.old Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2011-10-24net/9p: Convert net/9p protocol dumps to tracepointsAneesh Kumar K.V1-36/+41
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: <stack trace> => 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: <stack trace> => 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 <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2011-10-24fs/9p: change an int to unsigned intDan Carpenter1-1/+2
Without this msize=4294967295 will result in a crash Signed-off-by: Dan Carpenter <error27@gmail.com> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2011-10-24fs/9p: Cleanup option parsing in 9pAneesh Kumar K.V1-7/+5
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 <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2011-10-249p: move dereference after NULL checkDan Carpenter1-2/+2
We dereferenced "req->tc" and "req->rc" before checking for NULL. Signed-off-by: Dan Carpenter <error27@gmail.com> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2011-10-24fs/9p: Update zero-copy implementation in 9pAneesh Kumar K.V1-100/+291
* 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 <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2011-07-23net/9p: Fix the msize calculation.Venkateswararao Jujjuri (JV)1-2/+2
msize represents the maximum PDU size that includes P9_IOHDRSZ. Signed-off-by: Venkateswararao Jujjuri "<jvrao@linux.vnet.ibm.com> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2011-07-23fs/9p: add 9P2000.L unlinkat operationAneesh Kumar K.V1-0/+23
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 <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2011-07-23fs/9p: add 9P2000.L renameat operationAneesh Kumar K.V1-1/+32
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 <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2011-07-23fs/9p: Clean-up get_protocol_version() to use strcmpPrem Karat1-14/+33
Signed-off-by: Prem Karat <prem.karat@linux.vnet.ibm.com> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2011-07-23fs/9p: Fid is not valid after a failed clunk.Aneesh Kumar K.V1-2/+4
free the fid even in case of failed clunk. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2011-07-239p: clean up packet dump codeEric Van Hensbergen1-19/+20
Switch to generic kernel hexdump library and cleanup macros to be more consistent with the way we do normal debug prints. Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2011-07-23net/9p: fix client code to fail more gracefully on protocol errorEric Van Hensbergen1-1/+2
There was a BUG_ON to protect against a bad id which could be dealt with more gracefully. Reported-by: Natalie Orlin <norlin@us.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2011-05-25net/9p: p9_idpool_get return -1 on errorAneesh Kumar K.V1-8/+12
We need to return -1 on error. Also handle error properly Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2011-05-259p: typo fixes and minor cleanupsRob Landley1-5/+5
Typo fixes and minor cleanups for v9fs Signed-off-by: Rob Landley <rob@landley.net> Reviewed-by: Venkateswararao Jujjuri (JV) <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2011-05-20Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next-2.6Linus Torvalds1-6/+3
* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next-2.6: (1446 commits) macvlan: fix panic if lowerdev in a bond tg3: Add braces around 5906 workaround. tg3: Fix NETIF_F_LOOPBACK error macvlan: remove one synchronize_rcu() call networking: NET_CLS_ROUTE4 depends on INET irda: Fix error propagation in ircomm_lmp_connect_response() irda: Kill set but unused variable 'bytes' in irlan_check_command_param() irda: Kill set but unused variable 'clen' in ircomm_connect_indication() rxrpc: Fix set but unused variable 'usage' in rxrpc_get_transport() be2net: Kill set but unused variable 'req' in lancer_fw_download() irda: Kill set but unused vars 'saddr' and 'daddr' in irlan_provider_connect_indication() atl1c: atl1c_resume() is only used when CONFIG_PM_SLEEP is defined. rxrpc: Fix set but unused variable 'usage' in rxrpc_get_peer(). rxrpc: Kill set but unused variable 'local' in rxrpc_UDP_error_handler() rxrpc: Kill set but unused variable 'sp' in rxrpc_process_connection() rxrpc: Kill set but unused variable 'sp' in rxrpc_rotate_tx_window() pkt_sched: Kill set but unused variable 'protocol' in tc_classify() isdn: capi: Use pr_debug() instead of ifdefs. tg3: Update version to 3.119 tg3: Apply rx_discards fix to 5719/5720 ... Fix up trivial conflicts in arch/x86/Kconfig and net/mac80211/agg-tx.c as per Davem.
2011-05-09net/9p: Handle get_user_pages_fast return properlyM. Mohan Kumar1-1/+1
Use proper data type to handle get_user_pages_fast error condition. Also do not treat EFAULT error as fatal. Signed-off-by: M. Mohan Kumar <mohan@in.ibm.com> Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2011-04-15net/9p: nwname should be an unsigned intHarsh Prateek Bora1-4/+4
Signed-off-by: Harsh Prateek Bora <harsh@linux.vnet.ibm.com> Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric VAn Hensbergen <ericvh@gmail.com>
2011-04-159p: revert tsyncfs related changesAneesh Kumar K.V1-21/+0
Now that we use write_inode to flush server cache related to fid, we don't need tsyncfs either fort dotl or dotu protocols. For dotu this helps to do a more efficient server flush. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2011-04-129p: Kill set but unused variable in 9p_client_{read,write}() and p9_client_readdir()David S. Miller1-6/+3
Fixes the following warnings: net/9p/client.c:1305:18: warning: variable ‘total’ set but not used [-Wunused-but-set-variable] net/9p/client.c:1370:18: warning: variable ‘total’ set but not used [-Wunused-but-set-variable] net/9p/client.c:1769:18: warning: variable ‘total’ set but not used [-Wunused-but-set-variable] Signed-off-by: David S. Miller <davem@davemloft.net>
2011-03-31Fix common misspellingsLucas De Marchi1-1/+1
Fixes generated by 'codespell' and manually reviewed. Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
2011-03-22net/9p: Convert the in the 9p rpc call path to GFP_NOFSAneesh Kumar K.V1-5/+5
Without this we can cause reclaim allocation in writepage. [ 3433.448430] ================================= [ 3433.449117] [ INFO: inconsistent lock state ] [ 3433.449117] 2.6.38-rc5+ #84 [ 3433.449117] --------------------------------- [ 3433.449117] inconsistent {RECLAIM_FS-ON-W} -> {IN-RECLAIM_FS-R} usage. [ 3433.449117] kswapd0/505 [HC0[0]:SC0[0]:HE1:SE1] takes: [ 3433.449117] (iprune_sem){+++++-}, at: [<ffffffff810ebbab>] shrink_icache_memory+0x45/0x2b1 [ 3433.449117] {RECLAIM_FS-ON-W} state was registered at: [ 3433.449117] [<ffffffff8107fe5f>] mark_held_locks+0x52/0x70 [ 3433.449117] [<ffffffff8107ff02>] lockdep_trace_alloc+0x85/0x9f [ 3433.449117] [<ffffffff810d353d>] slab_pre_alloc_hook+0x18/0x3c [ 3433.449117] [<ffffffff810d3fd5>] kmem_cache_alloc+0x23/0xa2 [ 3433.449117] [<ffffffff8127be77>] idr_pre_get+0x2d/0x6f [ 3433.449117] [<ffffffff815434eb>] p9_idpool_get+0x30/0xae [ 3433.449117] [<ffffffff81540123>] p9_client_rpc+0xd7/0x9b0 [ 3433.449117] [<ffffffff815427b0>] p9_client_clunk+0x88/0xdb [ 3433.449117] [<ffffffff811d56e5>] v9fs_evict_inode+0x3c/0x48 [ 3433.449117] [<ffffffff810eb511>] evict+0x1f/0x87 [ 3433.449117] [<ffffffff810eb5c0>] dispose_list+0x47/0xe3 [ 3433.449117] [<ffffffff810eb8da>] evict_inodes+0x138/0x14f [ 3433.449117] [<ffffffff810d90e2>] generic_shutdown_super+0x57/0xe8 [ 3433.449117] [<ffffffff810d91e8>] kill_anon_super+0x11/0x50 [ 3433.449117] [<ffffffff811d4951>] v9fs_kill_super+0x49/0xab [ 3433.449117] [<ffffffff810d926e>] deactivate_locked_super+0x21/0x46 [ 3433.449117] [<ffffffff810d9e84>] deactivate_super+0x40/0x44 [ 3433.449117] [<ffffffff810ef848>] mntput_no_expire+0x100/0x109 [ 3433.449117] [<ffffffff810f0aeb>] sys_umount+0x2f1/0x31c [ 3433.449117] [<ffffffff8102c87b>] system_call_fastpath+0x16/0x1b [ 3433.449117] irq event stamp: 192941 [ 3433.449117] hardirqs last enabled at (192941): [<ffffffff81568dcf>] _raw_spin_unlock_irq+0x2b/0x30 [ 3433.449117] hardirqs last disabled at (192940): [<ffffffff810b5f97>] shrink_inactive_list+0x290/0x2f5 [ 3433.449117] softirqs last enabled at (188470): [<ffffffff8105fd65>] __do_softirq+0x133/0x152 [ 3433.449117] softirqs last disabled at (188455): [<ffffffff8102d7cc>] call_softirq+0x1c/0x28 [ 3433.449117] [ 3433.449117] other info that might help us debug this: [ 3433.449117] 1 lock held by kswapd0/505: [ 3433.449117] #0: (shrinker_rwsem){++++..}, at: [<ffffffff810b52e2>] shrink_slab+0x38/0x15f [ 3433.449117] [ 3433.449117] stack backtrace: [ 3433.449117] Pid: 505, comm: kswapd0 Not tainted 2.6.38-rc5+ #84 [ 3433.449117] Call Trace: [ 3433.449117] [<ffffffff8107fbce>] ? valid_state+0x17e/0x191 [ 3433.449117] [<ffffffff81036896>] ? save_stack_trace+0x28/0x45 [ 3433.449117] [<ffffffff81080426>] ? check_usage_forwards+0x0/0x87 [ 3433.449117] [<ffffffff8107fcf4>] ? mark_lock+0x113/0x22c [ 3433.449117] [<ffffffff8108105f>] ? __lock_acquire+0x37a/0xcf7 [ 3433.449117] [<ffffffff8107fc0e>] ? mark_lock+0x2d/0x22c [ 3433.449117] [<ffffffff81081077>] ? __lock_acquire+0x392/0xcf7 [ 3433.449117] [<ffffffff810b14d2>] ? determine_dirtyable_memory+0x15/0x28 [ 3433.449117] [<ffffffff81081a33>] ? lock_acquire+0x57/0x6d [ 3433.449117] [<ffffffff810ebbab>] ? shrink_icache_memory+0x45/0x2b1 [ 3433.449117] [<ffffffff81567d85>] ? down_read+0x47/0x5c [ 3433.449117] [<ffffffff810ebbab>] ? shrink_icache_memory+0x45/0x2b1 [ 3433.449117] [<ffffffff810ebbab>] ? shrink_icache_memory+0x45/0x2b1 [ 3433.449117] [<ffffffff810b5385>] ? shrink_slab+0xdb/0x15f [ 3433.449117] [<ffffffff810b69bc>] ? kswapd+0x574/0x96a [ 3433.449117] [<ffffffff810b6448>] ? kswapd+0x0/0x96a [ 3433.449117] [<ffffffff810714e2>] ? kthread+0x7d/0x85 [ 3433.449117] [<ffffffff8102d6d4>] ? kernel_thread_helper+0x4/0x10 [ 3433.449117] [<ffffffff81569200>] ? restore_args+0x0/0x30 [ 3433.449117] [<ffffffff81071465>] ? kthread+0x0/0x85 [ 3433.449117] [<ffffffff8102d6d0>] ? kernel_thread_helper+0x0/0x10 Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2011-03-15net/9p: Implement syncfs 9P operationAneesh Kumar K.V1-0/+21
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2011-03-15[net/9p] Small non-IO PDUs for zero-copy supporting transports.Venkateswararao Jujjuri (JV)1-6/+17
If a transport prefers payload to be sent separate from the PDU (P9_TRANS_PREF_PAYLOAD_SEP), there is no need to allocate msize PDU buffers(struct p9_fcall). This patch allocates only upto 4k buffers for this kind of transports and there won't be any change to the legacy transports. Hence, this patch on top of zero copy changes allows user to specify higher msizes through the mount option without hogging the kernel heap. Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2011-03-15[net/9p] Handle Zero Copy TREAD/RERROR case in !dotl case.Venkateswararao Jujjuri (JV)1-23/+41
This takes care of copying out error buffers from user buffer payloads when we are using zero copy. This happens because the only payload buffer the server has to respond to the request is the user buffer given for the zero copy read. Because we only use zerocopy when the amount of data to transfer is greater than a certain size (currently 4K) and error strings are limited to ERRMAX (currently 128) we don't need to worry about there being sufficient space for the error to fit in the payload. Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2011-03-15[net/9p] readdir zerocopy changes for 9P2000.L protocol.Venkateswararao Jujjuri (JV)1-2/+9
Modify p9_client_readdir() to check the transport preference and act according If the preference is P9_TRANS_PREF_PAYLOAD_SEP, send the payload separately instead of putting it directly on PDU. Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
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