linux/net/9p/protocol.c, branch v3.0.82

net/9p/protocol.c: Fix a memory leak

2011-05-12T22:05:37Z

When p9pdu_readf() is called with "s" attribute, it allocates a pointer that will store a string. In p9dirent_read(), this pointer is not being released, leading to out of memory errors. This patch releases this pointer after string is copyed to dirent->d_name. Signed-off-by: Pedro Scarapicchia Junior Signed-off-by: Eric Van Hensbergen

net/9p: nwname should be an unsigned int

2011-04-15T20:26:15Z

Signed-off-by: Harsh Prateek Bora Signed-off-by: Venkateswararao Jujjuri Signed-off-by: Eric VAn Hensbergen

9p: Fix sparse error

2011-04-15T20:26:14Z

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

net/9p: Convert the in the 9p rpc call path to GFP_NOFS

2011-03-22T20:43:35Z

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: [] shrink_icache_memory+0x45/0x2b1 [ 3433.449117] {RECLAIM_FS-ON-W} state was registered at: [ 3433.449117] [] mark_held_locks+0x52/0x70 [ 3433.449117] [] lockdep_trace_alloc+0x85/0x9f [ 3433.449117] [] slab_pre_alloc_hook+0x18/0x3c [ 3433.449117] [] kmem_cache_alloc+0x23/0xa2 [ 3433.449117] [] idr_pre_get+0x2d/0x6f [ 3433.449117] [] p9_idpool_get+0x30/0xae [ 3433.449117] [] p9_client_rpc+0xd7/0x9b0 [ 3433.449117] [] p9_client_clunk+0x88/0xdb [ 3433.449117] [] v9fs_evict_inode+0x3c/0x48 [ 3433.449117] [] evict+0x1f/0x87 [ 3433.449117] [] dispose_list+0x47/0xe3 [ 3433.449117] [] evict_inodes+0x138/0x14f [ 3433.449117] [] generic_shutdown_super+0x57/0xe8 [ 3433.449117] [] kill_anon_super+0x11/0x50 [ 3433.449117] [] v9fs_kill_super+0x49/0xab [ 3433.449117] [] deactivate_locked_super+0x21/0x46 [ 3433.449117] [] deactivate_super+0x40/0x44 [ 3433.449117] [] mntput_no_expire+0x100/0x109 [ 3433.449117] [] sys_umount+0x2f1/0x31c [ 3433.449117] [] system_call_fastpath+0x16/0x1b [ 3433.449117] irq event stamp: 192941 [ 3433.449117] hardirqs last enabled at (192941): [] _raw_spin_unlock_irq+0x2b/0x30 [ 3433.449117] hardirqs last disabled at (192940): [] shrink_inactive_list+0x290/0x2f5 [ 3433.449117] softirqs last enabled at (188470): [] __do_softirq+0x133/0x152 [ 3433.449117] softirqs last disabled at (188455): [] 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: [] 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] [] ? valid_state+0x17e/0x191 [ 3433.449117] [] ? save_stack_trace+0x28/0x45 [ 3433.449117] [] ? check_usage_forwards+0x0/0x87 [ 3433.449117] [] ? mark_lock+0x113/0x22c [ 3433.449117] [] ? __lock_acquire+0x37a/0xcf7 [ 3433.449117] [] ? mark_lock+0x2d/0x22c [ 3433.449117] [] ? __lock_acquire+0x392/0xcf7 [ 3433.449117] [] ? determine_dirtyable_memory+0x15/0x28 [ 3433.449117] [] ? lock_acquire+0x57/0x6d [ 3433.449117] [] ? shrink_icache_memory+0x45/0x2b1 [ 3433.449117] [] ? down_read+0x47/0x5c [ 3433.449117] [] ? shrink_icache_memory+0x45/0x2b1 [ 3433.449117] [] ? shrink_icache_memory+0x45/0x2b1 [ 3433.449117] [] ? shrink_slab+0xdb/0x15f [ 3433.449117] [] ? kswapd+0x574/0x96a [ 3433.449117] [] ? kswapd+0x0/0x96a [ 3433.449117] [] ? kthread+0x7d/0x85 [ 3433.449117] [] ? kernel_thread_helper+0x4/0x10 [ 3433.449117] [] ? restore_args+0x0/0x30 [ 3433.449117] [] ? kthread+0x0/0x85 [ 3433.449117] [] ? kernel_thread_helper+0x0/0x10 Signed-off-by: Aneesh Kumar K.V Signed-off-by: Venkateswararao Jujjuri Signed-off-by: Eric Van Hensbergen

[net/9p] readdir zerocopy changes for 9P2000.L protocol.

2011-03-15T14:57:35Z

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 Signed-off-by: Eric Van Hensbergen

[net/9p] Read side zerocopy changes for 9P2000.L protocol.

2011-03-15T14:57:35Z

Modify p9_client_read() to check the transport preference and act accordingly. 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 Signed-off-by: Eric Van Hensbergen

[net/9p] Assign type of transaction to tc->pdu->id which is otherwise unsed.

2011-03-15T14:57:34Z

This will be used by the transport layer to determine the out going request type. Transport layer uses this information to correctly place the mapped pages in the PDU. Patches following this will make use of this to achieve zero copy. Signed-off-by: Venkateswararao Jujjuri Signed-off-by: Eric Van Hensbergen

[net/9p] Preparation and helper functions for zero copy

2011-03-15T14:57:34Z

This patch prepares p9_fcall structure for zero copy. Added fields send the payload buffer information to the transport layer. In addition it adds a 'private' field for the transport layer to store mapped/pinned page information so that it can be freed/unpinned during req_done. This patch also creates trans_common.[ch] to house helper functions. It adds the following helper functions. p9_release_req_pages - Release pages after the transaction. p9_nr_pages - Return number of pages needed to accomodate the payload. payload_gup - Translates user buffer into kernel pages. Signed-off-by: Venkateswararao Jujjuri Signed-off-by: Eric Van Hensbergen

net/9p: Use proper data types

2011-01-11T15:58:07Z

Use proper data types for storing the count of the binary blob and length of a string. Without this patch length calculation of string will always result in -1 because of comparision between signed and unsigned integer. Signed-off-by: M. Mohan Kumar Signed-off-by: Venkateswararao Jujjuri Signed-off-by: Eric Van Hensbergen

net/9p/protocol.c: Remove duplicated macros.

2010-12-08T17:56:28Z

Use the macros already provided by kernel.h file. Signed-off-by: Thiago Farina Signed-off-by: David S. Miller