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author | Linus Torvalds <torvalds@linux-foundation.org> | 2019-07-19 00:32:33 +0300 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2019-07-19 00:32:33 +0300 |
commit | 6860c981b9672324cb53b883cfda8d2ea1445ff1 (patch) | |
tree | d97a47712479bc2f886012d7f2da8b00ac504f3a /net/sunrpc/backchannel_rqst.c | |
parent | 0570bc8b7c9b41deba6f61ac218922e7168ad648 (diff) | |
parent | d5b9216fd5114be4ed98ca9c1ecc5f164cd8cf5e (diff) | |
download | linux-6860c981b9672324cb53b883cfda8d2ea1445ff1.tar.xz |
Merge tag 'nfs-for-5.3-1' of git://git.linux-nfs.org/projects/trondmy/linux-nfs
Pull NFS client updates from Trond Myklebust:
"Highlights include:
Stable fixes:
- SUNRPC: Ensure bvecs are re-synced when we re-encode the RPC
request
- Fix an Oops in ff_layout_track_ds_error due to a PTR_ERR()
dereference
- Revert buggy NFS readdirplus optimisation
- NFSv4: Handle the special Linux file open access mode
- pnfs: Fix a problem where we gratuitously start doing I/O through
the MDS
Features:
- Allow NFS client to set up multiple TCP connections to the server
using a new 'nconnect=X' mount option. Queue length is used to
balance load.
- Enhance statistics reporting to report on all transports when using
multiple connections.
- Speed up SUNRPC by removing bh-safe spinlocks
- Add a mechanism to allow NFSv4 to request that containers set a
unique per-host identifier for when the hostname is not set.
- Ensure NFSv4 updates the lease_time after a clientid update
Bugfixes and cleanup:
- Fix use-after-free in rpcrdma_post_recvs
- Fix a memory leak when nfs_match_client() is interrupted
- Fix buggy file access checking in NFSv4 open for execute
- disable unsupported client side deduplication
- Fix spurious client disconnections
- Fix occasional RDMA transport deadlock
- Various RDMA cleanups
- Various tracepoint fixes
- Fix the TCP callback channel to guarantee the server can actually
send the number of callback requests that was negotiated at mount
time"
* tag 'nfs-for-5.3-1' of git://git.linux-nfs.org/projects/trondmy/linux-nfs: (68 commits)
pnfs/flexfiles: Add tracepoints for detecting pnfs fallback to MDS
pnfs: Fix a problem where we gratuitously start doing I/O through the MDS
SUNRPC: Optimise transport balancing code
SUNRPC: Ensure the bvecs are reset when we re-encode the RPC request
pnfs/flexfiles: Fix PTR_ERR() dereferences in ff_layout_track_ds_error
NFSv4: Don't use the zero stateid with layoutget
SUNRPC: Fix up backchannel slot table accounting
SUNRPC: Fix initialisation of struct rpc_xprt_switch
SUNRPC: Skip zero-refcount transports
SUNRPC: Replace division by multiplication in calculation of queue length
NFSv4: Validate the stateid before applying it to state recovery
nfs4.0: Refetch lease_time after clientid update
nfs4: Rename nfs41_setup_state_renewal
nfs4: Make nfs4_proc_get_lease_time available for nfs4.0
nfs: Fix copy-and-paste error in debug message
NFS: Replace 16 seq_printf() calls by seq_puts()
NFS: Use seq_putc() in nfs_show_stats()
Revert "NFS: readdirplus optimization by cache mechanism" (memleak)
SUNRPC: Fix transport accounting when caller specifies an rpc_xprt
NFS: Record task, client ID, and XID in xdr_status trace points
...
Diffstat (limited to 'net/sunrpc/backchannel_rqst.c')
-rw-r--r-- | net/sunrpc/backchannel_rqst.c | 40 |
1 files changed, 22 insertions, 18 deletions
diff --git a/net/sunrpc/backchannel_rqst.c b/net/sunrpc/backchannel_rqst.c index c47d82622fd1..339e8c077c2d 100644 --- a/net/sunrpc/backchannel_rqst.c +++ b/net/sunrpc/backchannel_rqst.c @@ -31,25 +31,20 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. #define RPCDBG_FACILITY RPCDBG_TRANS #endif +#define BC_MAX_SLOTS 64U + +unsigned int xprt_bc_max_slots(struct rpc_xprt *xprt) +{ + return BC_MAX_SLOTS; +} + /* * Helper routines that track the number of preallocation elements * on the transport. */ static inline int xprt_need_to_requeue(struct rpc_xprt *xprt) { - return xprt->bc_alloc_count < atomic_read(&xprt->bc_free_slots); -} - -static inline void xprt_inc_alloc_count(struct rpc_xprt *xprt, unsigned int n) -{ - atomic_add(n, &xprt->bc_free_slots); - xprt->bc_alloc_count += n; -} - -static inline int xprt_dec_alloc_count(struct rpc_xprt *xprt, unsigned int n) -{ - atomic_sub(n, &xprt->bc_free_slots); - return xprt->bc_alloc_count -= n; + return xprt->bc_alloc_count < xprt->bc_alloc_max; } /* @@ -145,6 +140,9 @@ int xprt_setup_bc(struct rpc_xprt *xprt, unsigned int min_reqs) dprintk("RPC: setup backchannel transport\n"); + if (min_reqs > BC_MAX_SLOTS) + min_reqs = BC_MAX_SLOTS; + /* * We use a temporary list to keep track of the preallocated * buffers. Once we're done building the list we splice it @@ -172,7 +170,9 @@ int xprt_setup_bc(struct rpc_xprt *xprt, unsigned int min_reqs) */ spin_lock(&xprt->bc_pa_lock); list_splice(&tmp_list, &xprt->bc_pa_list); - xprt_inc_alloc_count(xprt, min_reqs); + xprt->bc_alloc_count += min_reqs; + xprt->bc_alloc_max += min_reqs; + atomic_add(min_reqs, &xprt->bc_slot_count); spin_unlock(&xprt->bc_pa_lock); dprintk("RPC: setup backchannel transport done\n"); @@ -220,11 +220,13 @@ void xprt_destroy_bc(struct rpc_xprt *xprt, unsigned int max_reqs) goto out; spin_lock_bh(&xprt->bc_pa_lock); - xprt_dec_alloc_count(xprt, max_reqs); + xprt->bc_alloc_max -= max_reqs; list_for_each_entry_safe(req, tmp, &xprt->bc_pa_list, rq_bc_pa_list) { dprintk("RPC: req=%p\n", req); list_del(&req->rq_bc_pa_list); xprt_free_allocation(req); + xprt->bc_alloc_count--; + atomic_dec(&xprt->bc_slot_count); if (--max_reqs == 0) break; } @@ -241,13 +243,14 @@ static struct rpc_rqst *xprt_get_bc_request(struct rpc_xprt *xprt, __be32 xid, struct rpc_rqst *req = NULL; dprintk("RPC: allocate a backchannel request\n"); - if (atomic_read(&xprt->bc_free_slots) <= 0) - goto not_found; if (list_empty(&xprt->bc_pa_list)) { if (!new) goto not_found; + if (atomic_read(&xprt->bc_slot_count) >= BC_MAX_SLOTS) + goto not_found; list_add_tail(&new->rq_bc_pa_list, &xprt->bc_pa_list); xprt->bc_alloc_count++; + atomic_inc(&xprt->bc_slot_count); } req = list_first_entry(&xprt->bc_pa_list, struct rpc_rqst, rq_bc_pa_list); @@ -291,6 +294,7 @@ void xprt_free_bc_rqst(struct rpc_rqst *req) if (xprt_need_to_requeue(xprt)) { list_add_tail(&req->rq_bc_pa_list, &xprt->bc_pa_list); xprt->bc_alloc_count++; + atomic_inc(&xprt->bc_slot_count); req = NULL; } spin_unlock_bh(&xprt->bc_pa_lock); @@ -357,7 +361,7 @@ void xprt_complete_bc_request(struct rpc_rqst *req, uint32_t copied) spin_lock(&xprt->bc_pa_lock); list_del(&req->rq_bc_pa_list); - xprt_dec_alloc_count(xprt, 1); + xprt->bc_alloc_count--; spin_unlock(&xprt->bc_pa_lock); req->rq_private_buf.len = copied; |