diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2012-10-10 23:52:35 +0900 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-10-10 23:52:35 +0900 |
commit | df632d3ce7eacf92ad9b642301c7b53a1d95b8d8 (patch) | |
tree | 848c39ed4f7cfdb582bf2e0a0a03147efaa5198d /fs/nfs/nfs4client.c | |
parent | 2474542f64432398f503373f53bdf620491bcfa8 (diff) | |
parent | af283885b70248268617955a5ea5476647bd556b (diff) |
Merge tag 'nfs-for-3.7-1' of git://git.linux-nfs.org/projects/trondmy/linux-nfs
Pull NFS client updates from Trond Myklebust:
"Features include:
- Remove CONFIG_EXPERIMENTAL dependency from NFSv4.1
Aside from the issues discussed at the LKS, distros are shipping
NFSv4.1 with all the trimmings.
- Fix fdatasync()/fsync() for the corner case of a server reboot.
- NFSv4 OPEN access fix: finally distinguish correctly between
open-for-read and open-for-execute permissions in all situations.
- Ensure that the TCP socket is closed when we're in CLOSE_WAIT
- More idmapper bugfixes
- Lots of pNFS bugfixes and cleanups to remove unnecessary state and
make the code easier to read.
- In cases where a pNFS read or write fails, allow the client to
resume trying layoutgets after two minutes of read/write-
through-mds.
- More net namespace fixes to the NFSv4 callback code.
- More net namespace fixes to the NFSv3 locking code.
- More NFSv4 migration preparatory patches.
Including patches to detect network trunking in both NFSv4 and
NFSv4.1
- pNFS block updates to optimise LAYOUTGET calls."
* tag 'nfs-for-3.7-1' of git://git.linux-nfs.org/projects/trondmy/linux-nfs: (113 commits)
pnfsblock: cleanup nfs4_blkdev_get
NFS41: send real read size in layoutget
NFS41: send real write size in layoutget
NFS: track direct IO left bytes
NFSv4.1: Cleanup ugliness in pnfs_layoutgets_blocked()
NFSv4.1: Ensure that the layout sequence id stays 'close' to the current
NFSv4.1: Deal with seqid wraparound in the pNFS return-on-close code
NFSv4 set open access operation call flag in nfs4_init_opendata_res
NFSv4.1: Remove the dependency on CONFIG_EXPERIMENTAL
NFSv4 reduce attribute requests for open reclaim
NFSv4: nfs4_open_done first must check that GETATTR decoded a file type
NFSv4.1: Deal with wraparound when updating the layout "barrier" seqid
NFSv4.1: Deal with wraparound issues when updating the layout stateid
NFSv4.1: Always set the layout stateid if this is the first layoutget
NFSv4.1: Fix another refcount issue in pnfs_find_alloc_layout
NFSv4: don't put ACCESS in OPEN compound if O_EXCL
NFSv4: don't check MAY_WRITE access bit in OPEN
NFS: Set key construction data for the legacy upcall
NFSv4.1: don't do two EXCHANGE_IDs on mount
NFS: nfs41_walk_client_list(): re-lock before iterating
...
Diffstat (limited to 'fs/nfs/nfs4client.c')
-rw-r--r-- | fs/nfs/nfs4client.c | 256 |
1 files changed, 255 insertions, 1 deletions
diff --git a/fs/nfs/nfs4client.c b/fs/nfs/nfs4client.c index 24eb663f8ed..6bacfde1319 100644 --- a/fs/nfs/nfs4client.c +++ b/fs/nfs/nfs4client.c @@ -84,7 +84,7 @@ error: static void nfs4_destroy_callback(struct nfs_client *clp) { if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state)) - nfs_callback_down(clp->cl_mvops->minor_version); + nfs_callback_down(clp->cl_mvops->minor_version, clp->cl_net); } static void nfs4_shutdown_client(struct nfs_client *clp) @@ -185,6 +185,7 @@ struct nfs_client *nfs4_init_client(struct nfs_client *clp, rpc_authflavor_t authflavour) { char buf[INET6_ADDRSTRLEN + 1]; + struct nfs_client *old; int error; if (clp->cl_cons_state == NFS_CS_READY) { @@ -230,6 +231,17 @@ struct nfs_client *nfs4_init_client(struct nfs_client *clp, if (!nfs4_has_session(clp)) nfs_mark_client_ready(clp, NFS_CS_READY); + + error = nfs4_discover_server_trunking(clp, &old); + if (error < 0) + goto error; + if (clp != old) { + clp->cl_preserve_clid = true; + nfs_put_client(clp); + clp = old; + atomic_inc(&clp->cl_count); + } + return clp; error: @@ -239,6 +251,248 @@ error: return ERR_PTR(error); } +/* + * SETCLIENTID just did a callback update with the callback ident in + * "drop," but server trunking discovery claims "drop" and "keep" are + * actually the same server. Swap the callback IDs so that "keep" + * will continue to use the callback ident the server now knows about, + * and so that "keep"'s original callback ident is destroyed when + * "drop" is freed. + */ +static void nfs4_swap_callback_idents(struct nfs_client *keep, + struct nfs_client *drop) +{ + struct nfs_net *nn = net_generic(keep->cl_net, nfs_net_id); + unsigned int save = keep->cl_cb_ident; + + if (keep->cl_cb_ident == drop->cl_cb_ident) + return; + + dprintk("%s: keeping callback ident %u and dropping ident %u\n", + __func__, keep->cl_cb_ident, drop->cl_cb_ident); + + spin_lock(&nn->nfs_client_lock); + + idr_replace(&nn->cb_ident_idr, keep, drop->cl_cb_ident); + keep->cl_cb_ident = drop->cl_cb_ident; + + idr_replace(&nn->cb_ident_idr, drop, save); + drop->cl_cb_ident = save; + + spin_unlock(&nn->nfs_client_lock); +} + +/** + * nfs40_walk_client_list - Find server that recognizes a client ID + * + * @new: nfs_client with client ID to test + * @result: OUT: found nfs_client, or new + * @cred: credential to use for trunking test + * + * Returns zero, a negative errno, or a negative NFS4ERR status. + * If zero is returned, an nfs_client pointer is planted in "result." + * + * NB: nfs40_walk_client_list() relies on the new nfs_client being + * the last nfs_client on the list. + */ +int nfs40_walk_client_list(struct nfs_client *new, + struct nfs_client **result, + struct rpc_cred *cred) +{ + struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id); + struct nfs_client *pos, *n, *prev = NULL; + struct nfs4_setclientid_res clid = { + .clientid = new->cl_clientid, + .confirm = new->cl_confirm, + }; + int status; + + spin_lock(&nn->nfs_client_lock); + list_for_each_entry_safe(pos, n, &nn->nfs_client_list, cl_share_link) { + /* If "pos" isn't marked ready, we can't trust the + * remaining fields in "pos" */ + if (pos->cl_cons_state < NFS_CS_READY) + continue; + + if (pos->rpc_ops != new->rpc_ops) + continue; + + if (pos->cl_proto != new->cl_proto) + continue; + + if (pos->cl_minorversion != new->cl_minorversion) + continue; + + if (pos->cl_clientid != new->cl_clientid) + continue; + + atomic_inc(&pos->cl_count); + spin_unlock(&nn->nfs_client_lock); + + if (prev) + nfs_put_client(prev); + + status = nfs4_proc_setclientid_confirm(pos, &clid, cred); + if (status == 0) { + nfs4_swap_callback_idents(pos, new); + + nfs_put_client(pos); + *result = pos; + dprintk("NFS: <-- %s using nfs_client = %p ({%d})\n", + __func__, pos, atomic_read(&pos->cl_count)); + return 0; + } + if (status != -NFS4ERR_STALE_CLIENTID) { + nfs_put_client(pos); + dprintk("NFS: <-- %s status = %d, no result\n", + __func__, status); + return status; + } + + spin_lock(&nn->nfs_client_lock); + prev = pos; + } + + /* + * No matching nfs_client found. This should be impossible, + * because the new nfs_client has already been added to + * nfs_client_list by nfs_get_client(). + * + * Don't BUG(), since the caller is holding a mutex. + */ + if (prev) + nfs_put_client(prev); + spin_unlock(&nn->nfs_client_lock); + pr_err("NFS: %s Error: no matching nfs_client found\n", __func__); + return -NFS4ERR_STALE_CLIENTID; +} + +#ifdef CONFIG_NFS_V4_1 +/* + * Returns true if the client IDs match + */ +static bool nfs4_match_clientids(struct nfs_client *a, struct nfs_client *b) +{ + if (a->cl_clientid != b->cl_clientid) { + dprintk("NFS: --> %s client ID %llx does not match %llx\n", + __func__, a->cl_clientid, b->cl_clientid); + return false; + } + dprintk("NFS: --> %s client ID %llx matches %llx\n", + __func__, a->cl_clientid, b->cl_clientid); + return true; +} + +/* + * Returns true if the server owners match + */ +static bool +nfs4_match_serverowners(struct nfs_client *a, struct nfs_client *b) +{ + struct nfs41_server_owner *o1 = a->cl_serverowner; + struct nfs41_server_owner *o2 = b->cl_serverowner; + + if (o1->minor_id != o2->minor_id) { + dprintk("NFS: --> %s server owner minor IDs do not match\n", + __func__); + return false; + } + + if (o1->major_id_sz != o2->major_id_sz) + goto out_major_mismatch; + if (memcmp(o1->major_id, o2->major_id, o1->major_id_sz) != 0) + goto out_major_mismatch; + + dprintk("NFS: --> %s server owners match\n", __func__); + return true; + +out_major_mismatch: + dprintk("NFS: --> %s server owner major IDs do not match\n", + __func__); + return false; +} + +/** + * nfs41_walk_client_list - Find nfs_client that matches a client/server owner + * + * @new: nfs_client with client ID to test + * @result: OUT: found nfs_client, or new + * @cred: credential to use for trunking test + * + * Returns zero, a negative errno, or a negative NFS4ERR status. + * If zero is returned, an nfs_client pointer is planted in "result." + * + * NB: nfs41_walk_client_list() relies on the new nfs_client being + * the last nfs_client on the list. + */ +int nfs41_walk_client_list(struct nfs_client *new, + struct nfs_client **result, + struct rpc_cred *cred) +{ + struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id); + struct nfs_client *pos, *n, *prev = NULL; + int error; + + spin_lock(&nn->nfs_client_lock); + list_for_each_entry_safe(pos, n, &nn->nfs_client_list, cl_share_link) { + /* If "pos" isn't marked ready, we can't trust the + * remaining fields in "pos", especially the client + * ID and serverowner fields. Wait for CREATE_SESSION + * to finish. */ + if (pos->cl_cons_state < NFS_CS_READY) { + atomic_inc(&pos->cl_count); + spin_unlock(&nn->nfs_client_lock); + + if (prev) + nfs_put_client(prev); + prev = pos; + + error = nfs_wait_client_init_complete(pos); + if (error < 0) { + nfs_put_client(pos); + spin_lock(&nn->nfs_client_lock); + continue; + } + + spin_lock(&nn->nfs_client_lock); + } + + if (pos->rpc_ops != new->rpc_ops) + continue; + + if (pos->cl_proto != new->cl_proto) + continue; + + if (pos->cl_minorversion != new->cl_minorversion) + continue; + + if (!nfs4_match_clientids(pos, new)) + continue; + + if (!nfs4_match_serverowners(pos, new)) + continue; + + spin_unlock(&nn->nfs_client_lock); + dprintk("NFS: <-- %s using nfs_client = %p ({%d})\n", + __func__, pos, atomic_read(&pos->cl_count)); + + *result = pos; + return 0; + } + + /* + * No matching nfs_client found. This should be impossible, + * because the new nfs_client has already been added to + * nfs_client_list by nfs_get_client(). + * + * Don't BUG(), since the caller is holding a mutex. + */ + spin_unlock(&nn->nfs_client_lock); + pr_err("NFS: %s Error: no matching nfs_client found\n", __func__); + return -NFS4ERR_STALE_CLIENTID; +} +#endif /* CONFIG_NFS_V4_1 */ + static void nfs4_destroy_server(struct nfs_server *server) { nfs_server_return_all_delegations(server); |