| /* |
| * fs/nfs/nfs4proc.c |
| * |
| * Client-side procedure declarations for NFSv4. |
| * |
| * Copyright (c) 2002 The Regents of the University of Michigan. |
| * All rights reserved. |
| * |
| * Kendrick Smith <kmsmith@umich.edu> |
| * Andy Adamson <andros@umich.edu> |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * 3. Neither the name of the University nor the names of its |
| * contributors may be used to endorse or promote products derived |
| * from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED |
| * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
| * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR |
| * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
| * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
| * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include <linux/mm.h> |
| #include <linux/delay.h> |
| #include <linux/errno.h> |
| #include <linux/string.h> |
| #include <linux/ratelimit.h> |
| #include <linux/printk.h> |
| #include <linux/slab.h> |
| #include <linux/sunrpc/clnt.h> |
| #include <linux/nfs.h> |
| #include <linux/nfs4.h> |
| #include <linux/nfs_fs.h> |
| #include <linux/nfs_page.h> |
| #include <linux/nfs_mount.h> |
| #include <linux/namei.h> |
| #include <linux/mount.h> |
| #include <linux/module.h> |
| #include <linux/xattr.h> |
| #include <linux/utsname.h> |
| #include <linux/freezer.h> |
| |
| #include "nfs4_fs.h" |
| #include "delegation.h" |
| #include "internal.h" |
| #include "iostat.h" |
| #include "callback.h" |
| #include "pnfs.h" |
| #include "netns.h" |
| #include "nfs4idmap.h" |
| #include "nfs4session.h" |
| #include "fscache.h" |
| |
| #include "nfs4trace.h" |
| |
| #define NFSDBG_FACILITY NFSDBG_PROC |
| |
| #define NFS4_POLL_RETRY_MIN (HZ/10) |
| #define NFS4_POLL_RETRY_MAX (15*HZ) |
| |
| /* file attributes which can be mapped to nfs attributes */ |
| #define NFS4_VALID_ATTRS (ATTR_MODE \ |
| | ATTR_UID \ |
| | ATTR_GID \ |
| | ATTR_SIZE \ |
| | ATTR_ATIME \ |
| | ATTR_MTIME \ |
| | ATTR_CTIME \ |
| | ATTR_ATIME_SET \ |
| | ATTR_MTIME_SET) |
| |
| struct nfs4_opendata; |
| static int _nfs4_proc_open(struct nfs4_opendata *data); |
| static int _nfs4_recover_proc_open(struct nfs4_opendata *data); |
| static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *); |
| static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr); |
| static int nfs4_proc_getattr(struct nfs_server *, struct nfs_fh *, struct nfs_fattr *, struct nfs4_label *label); |
| static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr, struct nfs4_label *label); |
| static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred, |
| struct nfs_fattr *fattr, struct iattr *sattr, |
| struct nfs_open_context *ctx, struct nfs4_label *ilabel, |
| struct nfs4_label *olabel); |
| #ifdef CONFIG_NFS_V4_1 |
| static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *, |
| struct rpc_cred *); |
| static int nfs41_free_stateid(struct nfs_server *, const nfs4_stateid *, |
| struct rpc_cred *, bool); |
| #endif |
| |
| #ifdef CONFIG_NFS_V4_SECURITY_LABEL |
| static inline struct nfs4_label * |
| nfs4_label_init_security(struct inode *dir, struct dentry *dentry, |
| struct iattr *sattr, struct nfs4_label *label) |
| { |
| int err; |
| |
| if (label == NULL) |
| return NULL; |
| |
| if (nfs_server_capable(dir, NFS_CAP_SECURITY_LABEL) == 0) |
| return NULL; |
| |
| err = security_dentry_init_security(dentry, sattr->ia_mode, |
| &dentry->d_name, (void **)&label->label, &label->len); |
| if (err == 0) |
| return label; |
| |
| return NULL; |
| } |
| static inline void |
| nfs4_label_release_security(struct nfs4_label *label) |
| { |
| if (label) |
| security_release_secctx(label->label, label->len); |
| } |
| static inline u32 *nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label) |
| { |
| if (label) |
| return server->attr_bitmask; |
| |
| return server->attr_bitmask_nl; |
| } |
| #else |
| static inline struct nfs4_label * |
| nfs4_label_init_security(struct inode *dir, struct dentry *dentry, |
| struct iattr *sattr, struct nfs4_label *l) |
| { return NULL; } |
| static inline void |
| nfs4_label_release_security(struct nfs4_label *label) |
| { return; } |
| static inline u32 * |
| nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label) |
| { return server->attr_bitmask; } |
| #endif |
| |
| /* Prevent leaks of NFSv4 errors into userland */ |
| static int nfs4_map_errors(int err) |
| { |
| if (err >= -1000) |
| return err; |
| switch (err) { |
| case -NFS4ERR_RESOURCE: |
| case -NFS4ERR_LAYOUTTRYLATER: |
| case -NFS4ERR_RECALLCONFLICT: |
| return -EREMOTEIO; |
| case -NFS4ERR_WRONGSEC: |
| case -NFS4ERR_WRONG_CRED: |
| return -EPERM; |
| case -NFS4ERR_BADOWNER: |
| case -NFS4ERR_BADNAME: |
| return -EINVAL; |
| case -NFS4ERR_SHARE_DENIED: |
| return -EACCES; |
| case -NFS4ERR_MINOR_VERS_MISMATCH: |
| return -EPROTONOSUPPORT; |
| case -NFS4ERR_FILE_OPEN: |
| return -EBUSY; |
| default: |
| dprintk("%s could not handle NFSv4 error %d\n", |
| __func__, -err); |
| break; |
| } |
| return -EIO; |
| } |
| |
| /* |
| * This is our standard bitmap for GETATTR requests. |
| */ |
| const u32 nfs4_fattr_bitmap[3] = { |
| FATTR4_WORD0_TYPE |
| | FATTR4_WORD0_CHANGE |
| | FATTR4_WORD0_SIZE |
| | FATTR4_WORD0_FSID |
| | FATTR4_WORD0_FILEID, |
| FATTR4_WORD1_MODE |
| | FATTR4_WORD1_NUMLINKS |
| | FATTR4_WORD1_OWNER |
| | FATTR4_WORD1_OWNER_GROUP |
| | FATTR4_WORD1_RAWDEV |
| | FATTR4_WORD1_SPACE_USED |
| | FATTR4_WORD1_TIME_ACCESS |
| | FATTR4_WORD1_TIME_METADATA |
| | FATTR4_WORD1_TIME_MODIFY |
| | FATTR4_WORD1_MOUNTED_ON_FILEID, |
| #ifdef CONFIG_NFS_V4_SECURITY_LABEL |
| FATTR4_WORD2_SECURITY_LABEL |
| #endif |
| }; |
| |
| static const u32 nfs4_pnfs_open_bitmap[3] = { |
| FATTR4_WORD0_TYPE |
| | FATTR4_WORD0_CHANGE |
| | FATTR4_WORD0_SIZE |
| | FATTR4_WORD0_FSID |
| | FATTR4_WORD0_FILEID, |
| FATTR4_WORD1_MODE |
| | FATTR4_WORD1_NUMLINKS |
| | FATTR4_WORD1_OWNER |
| | FATTR4_WORD1_OWNER_GROUP |
| | FATTR4_WORD1_RAWDEV |
| | FATTR4_WORD1_SPACE_USED |
| | FATTR4_WORD1_TIME_ACCESS |
| | FATTR4_WORD1_TIME_METADATA |
| | FATTR4_WORD1_TIME_MODIFY, |
| FATTR4_WORD2_MDSTHRESHOLD |
| #ifdef CONFIG_NFS_V4_SECURITY_LABEL |
| | FATTR4_WORD2_SECURITY_LABEL |
| #endif |
| }; |
| |
| static const u32 nfs4_open_noattr_bitmap[3] = { |
| FATTR4_WORD0_TYPE |
| | FATTR4_WORD0_FILEID, |
| }; |
| |
| const u32 nfs4_statfs_bitmap[3] = { |
| FATTR4_WORD0_FILES_AVAIL |
| | FATTR4_WORD0_FILES_FREE |
| | FATTR4_WORD0_FILES_TOTAL, |
| FATTR4_WORD1_SPACE_AVAIL |
| | FATTR4_WORD1_SPACE_FREE |
| | FATTR4_WORD1_SPACE_TOTAL |
| }; |
| |
| const u32 nfs4_pathconf_bitmap[3] = { |
| FATTR4_WORD0_MAXLINK |
| | FATTR4_WORD0_MAXNAME, |
| 0 |
| }; |
| |
| const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE |
| | FATTR4_WORD0_MAXREAD |
| | FATTR4_WORD0_MAXWRITE |
| | FATTR4_WORD0_LEASE_TIME, |
| FATTR4_WORD1_TIME_DELTA |
| | FATTR4_WORD1_FS_LAYOUT_TYPES, |
| FATTR4_WORD2_LAYOUT_BLKSIZE |
| | FATTR4_WORD2_CLONE_BLKSIZE |
| }; |
| |
| const u32 nfs4_fs_locations_bitmap[3] = { |
| FATTR4_WORD0_TYPE |
| | FATTR4_WORD0_CHANGE |
| | FATTR4_WORD0_SIZE |
| | FATTR4_WORD0_FSID |
| | FATTR4_WORD0_FILEID |
| | FATTR4_WORD0_FS_LOCATIONS, |
| FATTR4_WORD1_MODE |
| | FATTR4_WORD1_NUMLINKS |
| | FATTR4_WORD1_OWNER |
| | FATTR4_WORD1_OWNER_GROUP |
| | FATTR4_WORD1_RAWDEV |
| | FATTR4_WORD1_SPACE_USED |
| | FATTR4_WORD1_TIME_ACCESS |
| | FATTR4_WORD1_TIME_METADATA |
| | FATTR4_WORD1_TIME_MODIFY |
| | FATTR4_WORD1_MOUNTED_ON_FILEID, |
| }; |
| |
| static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry, |
| struct nfs4_readdir_arg *readdir) |
| { |
| unsigned int attrs = FATTR4_WORD0_FILEID | FATTR4_WORD0_TYPE; |
| __be32 *start, *p; |
| |
| if (cookie > 2) { |
| readdir->cookie = cookie; |
| memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier)); |
| return; |
| } |
| |
| readdir->cookie = 0; |
| memset(&readdir->verifier, 0, sizeof(readdir->verifier)); |
| if (cookie == 2) |
| return; |
| |
| /* |
| * NFSv4 servers do not return entries for '.' and '..' |
| * Therefore, we fake these entries here. We let '.' |
| * have cookie 0 and '..' have cookie 1. Note that |
| * when talking to the server, we always send cookie 0 |
| * instead of 1 or 2. |
| */ |
| start = p = kmap_atomic(*readdir->pages); |
| |
| if (cookie == 0) { |
| *p++ = xdr_one; /* next */ |
| *p++ = xdr_zero; /* cookie, first word */ |
| *p++ = xdr_one; /* cookie, second word */ |
| *p++ = xdr_one; /* entry len */ |
| memcpy(p, ".\0\0\0", 4); /* entry */ |
| p++; |
| *p++ = xdr_one; /* bitmap length */ |
| *p++ = htonl(attrs); /* bitmap */ |
| *p++ = htonl(12); /* attribute buffer length */ |
| *p++ = htonl(NF4DIR); |
| p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry))); |
| } |
| |
| *p++ = xdr_one; /* next */ |
| *p++ = xdr_zero; /* cookie, first word */ |
| *p++ = xdr_two; /* cookie, second word */ |
| *p++ = xdr_two; /* entry len */ |
| memcpy(p, "..\0\0", 4); /* entry */ |
| p++; |
| *p++ = xdr_one; /* bitmap length */ |
| *p++ = htonl(attrs); /* bitmap */ |
| *p++ = htonl(12); /* attribute buffer length */ |
| *p++ = htonl(NF4DIR); |
| p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry->d_parent))); |
| |
| readdir->pgbase = (char *)p - (char *)start; |
| readdir->count -= readdir->pgbase; |
| kunmap_atomic(start); |
| } |
| |
| static void nfs4_test_and_free_stateid(struct nfs_server *server, |
| nfs4_stateid *stateid, |
| struct rpc_cred *cred) |
| { |
| const struct nfs4_minor_version_ops *ops = server->nfs_client->cl_mvops; |
| |
| ops->test_and_free_expired(server, stateid, cred); |
| } |
| |
| static void __nfs4_free_revoked_stateid(struct nfs_server *server, |
| nfs4_stateid *stateid, |
| struct rpc_cred *cred) |
| { |
| stateid->type = NFS4_REVOKED_STATEID_TYPE; |
| nfs4_test_and_free_stateid(server, stateid, cred); |
| } |
| |
| static void nfs4_free_revoked_stateid(struct nfs_server *server, |
| const nfs4_stateid *stateid, |
| struct rpc_cred *cred) |
| { |
| nfs4_stateid tmp; |
| |
| nfs4_stateid_copy(&tmp, stateid); |
| __nfs4_free_revoked_stateid(server, &tmp, cred); |
| } |
| |
| static long nfs4_update_delay(long *timeout) |
| { |
| long ret; |
| if (!timeout) |
| return NFS4_POLL_RETRY_MAX; |
| if (*timeout <= 0) |
| *timeout = NFS4_POLL_RETRY_MIN; |
| if (*timeout > NFS4_POLL_RETRY_MAX) |
| *timeout = NFS4_POLL_RETRY_MAX; |
| ret = *timeout; |
| *timeout <<= 1; |
| return ret; |
| } |
| |
| static int nfs4_delay(struct rpc_clnt *clnt, long *timeout) |
| { |
| int res = 0; |
| |
| might_sleep(); |
| |
| freezable_schedule_timeout_killable_unsafe( |
| nfs4_update_delay(timeout)); |
| if (fatal_signal_pending(current)) |
| res = -ERESTARTSYS; |
| return res; |
| } |
| |
| /* This is the error handling routine for processes that are allowed |
| * to sleep. |
| */ |
| static int nfs4_do_handle_exception(struct nfs_server *server, |
| int errorcode, struct nfs4_exception *exception) |
| { |
| struct nfs_client *clp = server->nfs_client; |
| struct nfs4_state *state = exception->state; |
| const nfs4_stateid *stateid = exception->stateid; |
| struct inode *inode = exception->inode; |
| int ret = errorcode; |
| |
| exception->delay = 0; |
| exception->recovering = 0; |
| exception->retry = 0; |
| |
| if (stateid == NULL && state != NULL) |
| stateid = &state->stateid; |
| |
| switch(errorcode) { |
| case 0: |
| return 0; |
| case -NFS4ERR_DELEG_REVOKED: |
| case -NFS4ERR_ADMIN_REVOKED: |
| case -NFS4ERR_EXPIRED: |
| case -NFS4ERR_BAD_STATEID: |
| if (inode != NULL && stateid != NULL) { |
| nfs_inode_find_state_and_recover(inode, |
| stateid); |
| goto wait_on_recovery; |
| } |
| case -NFS4ERR_OPENMODE: |
| if (inode) { |
| int err; |
| |
| err = nfs_async_inode_return_delegation(inode, |
| stateid); |
| if (err == 0) |
| goto wait_on_recovery; |
| if (stateid != NULL && stateid->type == NFS4_DELEGATION_STATEID_TYPE) { |
| exception->retry = 1; |
| break; |
| } |
| } |
| if (state == NULL) |
| break; |
| ret = nfs4_schedule_stateid_recovery(server, state); |
| if (ret < 0) |
| break; |
| goto wait_on_recovery; |
| case -NFS4ERR_STALE_STATEID: |
| case -NFS4ERR_STALE_CLIENTID: |
| nfs4_schedule_lease_recovery(clp); |
| goto wait_on_recovery; |
| case -NFS4ERR_MOVED: |
| ret = nfs4_schedule_migration_recovery(server); |
| if (ret < 0) |
| break; |
| goto wait_on_recovery; |
| case -NFS4ERR_LEASE_MOVED: |
| nfs4_schedule_lease_moved_recovery(clp); |
| goto wait_on_recovery; |
| #if defined(CONFIG_NFS_V4_1) |
| case -NFS4ERR_BADSESSION: |
| case -NFS4ERR_BADSLOT: |
| case -NFS4ERR_BAD_HIGH_SLOT: |
| case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: |
| case -NFS4ERR_DEADSESSION: |
| case -NFS4ERR_SEQ_FALSE_RETRY: |
| case -NFS4ERR_SEQ_MISORDERED: |
| dprintk("%s ERROR: %d Reset session\n", __func__, |
| errorcode); |
| nfs4_schedule_session_recovery(clp->cl_session, errorcode); |
| goto wait_on_recovery; |
| #endif /* defined(CONFIG_NFS_V4_1) */ |
| case -NFS4ERR_FILE_OPEN: |
| if (exception->timeout > HZ) { |
| /* We have retried a decent amount, time to |
| * fail |
| */ |
| ret = -EBUSY; |
| break; |
| } |
| case -NFS4ERR_DELAY: |
| nfs_inc_server_stats(server, NFSIOS_DELAY); |
| case -NFS4ERR_GRACE: |
| case -NFS4ERR_LAYOUTTRYLATER: |
| case -NFS4ERR_RECALLCONFLICT: |
| exception->delay = 1; |
| return 0; |
| |
| case -NFS4ERR_RETRY_UNCACHED_REP: |
| case -NFS4ERR_OLD_STATEID: |
| exception->retry = 1; |
| break; |
| case -NFS4ERR_BADOWNER: |
| /* The following works around a Linux server bug! */ |
| case -NFS4ERR_BADNAME: |
| if (server->caps & NFS_CAP_UIDGID_NOMAP) { |
| server->caps &= ~NFS_CAP_UIDGID_NOMAP; |
| exception->retry = 1; |
| printk(KERN_WARNING "NFS: v4 server %s " |
| "does not accept raw " |
| "uid/gids. " |
| "Reenabling the idmapper.\n", |
| server->nfs_client->cl_hostname); |
| } |
| } |
| /* We failed to handle the error */ |
| return nfs4_map_errors(ret); |
| wait_on_recovery: |
| exception->recovering = 1; |
| return 0; |
| } |
| |
| /* This is the error handling routine for processes that are allowed |
| * to sleep. |
| */ |
| int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception) |
| { |
| struct nfs_client *clp = server->nfs_client; |
| int ret; |
| |
| ret = nfs4_do_handle_exception(server, errorcode, exception); |
| if (exception->delay) { |
| ret = nfs4_delay(server->client, &exception->timeout); |
| goto out_retry; |
| } |
| if (exception->recovering) { |
| ret = nfs4_wait_clnt_recover(clp); |
| if (test_bit(NFS_MIG_FAILED, &server->mig_status)) |
| return -EIO; |
| goto out_retry; |
| } |
| return ret; |
| out_retry: |
| if (ret == 0) |
| exception->retry = 1; |
| return ret; |
| } |
| |
| static int |
| nfs4_async_handle_exception(struct rpc_task *task, struct nfs_server *server, |
| int errorcode, struct nfs4_exception *exception) |
| { |
| struct nfs_client *clp = server->nfs_client; |
| int ret; |
| |
| ret = nfs4_do_handle_exception(server, errorcode, exception); |
| if (exception->delay) { |
| rpc_delay(task, nfs4_update_delay(&exception->timeout)); |
| goto out_retry; |
| } |
| if (exception->recovering) { |
| rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL); |
| if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0) |
| rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task); |
| goto out_retry; |
| } |
| if (test_bit(NFS_MIG_FAILED, &server->mig_status)) |
| ret = -EIO; |
| return ret; |
| out_retry: |
| if (ret == 0) |
| exception->retry = 1; |
| return ret; |
| } |
| |
| static int |
| nfs4_async_handle_error(struct rpc_task *task, struct nfs_server *server, |
| struct nfs4_state *state, long *timeout) |
| { |
| struct nfs4_exception exception = { |
| .state = state, |
| }; |
| |
| if (task->tk_status >= 0) |
| return 0; |
| if (timeout) |
| exception.timeout = *timeout; |
| task->tk_status = nfs4_async_handle_exception(task, server, |
| task->tk_status, |
| &exception); |
| if (exception.delay && timeout) |
| *timeout = exception.timeout; |
| if (exception.retry) |
| return -EAGAIN; |
| return 0; |
| } |
| |
| /* |
| * Return 'true' if 'clp' is using an rpc_client that is integrity protected |
| * or 'false' otherwise. |
| */ |
| static bool _nfs4_is_integrity_protected(struct nfs_client *clp) |
| { |
| rpc_authflavor_t flavor = clp->cl_rpcclient->cl_auth->au_flavor; |
| return (flavor == RPC_AUTH_GSS_KRB5I) || (flavor == RPC_AUTH_GSS_KRB5P); |
| } |
| |
| static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp) |
| { |
| spin_lock(&clp->cl_lock); |
| if (time_before(clp->cl_last_renewal,timestamp)) |
| clp->cl_last_renewal = timestamp; |
| spin_unlock(&clp->cl_lock); |
| } |
| |
| static void renew_lease(const struct nfs_server *server, unsigned long timestamp) |
| { |
| struct nfs_client *clp = server->nfs_client; |
| |
| if (!nfs4_has_session(clp)) |
| do_renew_lease(clp, timestamp); |
| } |
| |
| struct nfs4_call_sync_data { |
| const struct nfs_server *seq_server; |
| struct nfs4_sequence_args *seq_args; |
| struct nfs4_sequence_res *seq_res; |
| }; |
| |
| void nfs4_init_sequence(struct nfs4_sequence_args *args, |
| struct nfs4_sequence_res *res, int cache_reply) |
| { |
| args->sa_slot = NULL; |
| args->sa_cache_this = cache_reply; |
| args->sa_privileged = 0; |
| |
| res->sr_slot = NULL; |
| } |
| |
| static void nfs4_set_sequence_privileged(struct nfs4_sequence_args *args) |
| { |
| args->sa_privileged = 1; |
| } |
| |
| static void nfs40_sequence_free_slot(struct nfs4_sequence_res *res) |
| { |
| struct nfs4_slot *slot = res->sr_slot; |
| struct nfs4_slot_table *tbl; |
| |
| tbl = slot->table; |
| spin_lock(&tbl->slot_tbl_lock); |
| if (!nfs41_wake_and_assign_slot(tbl, slot)) |
| nfs4_free_slot(tbl, slot); |
| spin_unlock(&tbl->slot_tbl_lock); |
| |
| res->sr_slot = NULL; |
| } |
| |
| static int nfs40_sequence_done(struct rpc_task *task, |
| struct nfs4_sequence_res *res) |
| { |
| if (res->sr_slot != NULL) |
| nfs40_sequence_free_slot(res); |
| return 1; |
| } |
| |
| #if defined(CONFIG_NFS_V4_1) |
| |
| static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res) |
| { |
| struct nfs4_session *session; |
| struct nfs4_slot_table *tbl; |
| struct nfs4_slot *slot = res->sr_slot; |
| bool send_new_highest_used_slotid = false; |
| |
| tbl = slot->table; |
| session = tbl->session; |
| |
| /* Bump the slot sequence number */ |
| if (slot->seq_done) |
| slot->seq_nr++; |
| slot->seq_done = 0; |
| |
| spin_lock(&tbl->slot_tbl_lock); |
| /* Be nice to the server: try to ensure that the last transmitted |
| * value for highest_user_slotid <= target_highest_slotid |
| */ |
| if (tbl->highest_used_slotid > tbl->target_highest_slotid) |
| send_new_highest_used_slotid = true; |
| |
| if (nfs41_wake_and_assign_slot(tbl, slot)) { |
| send_new_highest_used_slotid = false; |
| goto out_unlock; |
| } |
| nfs4_free_slot(tbl, slot); |
| |
| if (tbl->highest_used_slotid != NFS4_NO_SLOT) |
| send_new_highest_used_slotid = false; |
| out_unlock: |
| spin_unlock(&tbl->slot_tbl_lock); |
| res->sr_slot = NULL; |
| if (send_new_highest_used_slotid) |
| nfs41_notify_server(session->clp); |
| if (waitqueue_active(&tbl->slot_waitq)) |
| wake_up_all(&tbl->slot_waitq); |
| } |
| |
| static int nfs41_sequence_process(struct rpc_task *task, |
| struct nfs4_sequence_res *res) |
| { |
| struct nfs4_session *session; |
| struct nfs4_slot *slot = res->sr_slot; |
| struct nfs_client *clp; |
| bool interrupted = false; |
| int ret = 1; |
| |
| if (slot == NULL) |
| goto out_noaction; |
| /* don't increment the sequence number if the task wasn't sent */ |
| if (!RPC_WAS_SENT(task)) |
| goto out; |
| |
| session = slot->table->session; |
| |
| if (slot->interrupted) { |
| if (res->sr_status != -NFS4ERR_DELAY) |
| slot->interrupted = 0; |
| interrupted = true; |
| } |
| |
| trace_nfs4_sequence_done(session, res); |
| /* Check the SEQUENCE operation status */ |
| switch (res->sr_status) { |
| case 0: |
| /* If previous op on slot was interrupted and we reused |
| * the seq# and got a reply from the cache, then retry |
| */ |
| if (task->tk_status == -EREMOTEIO && interrupted) { |
| ++slot->seq_nr; |
| goto retry_nowait; |
| } |
| /* Update the slot's sequence and clientid lease timer */ |
| slot->seq_done = 1; |
| clp = session->clp; |
| do_renew_lease(clp, res->sr_timestamp); |
| /* Check sequence flags */ |
| nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags, |
| !!slot->privileged); |
| nfs41_update_target_slotid(slot->table, slot, res); |
| break; |
| case 1: |
| /* |
| * sr_status remains 1 if an RPC level error occurred. |
| * The server may or may not have processed the sequence |
| * operation.. |
| * Mark the slot as having hosted an interrupted RPC call. |
| */ |
| slot->interrupted = 1; |
| goto out; |
| case -NFS4ERR_DELAY: |
| /* The server detected a resend of the RPC call and |
| * returned NFS4ERR_DELAY as per Section 2.10.6.2 |
| * of RFC5661. |
| */ |
| dprintk("%s: slot=%u seq=%u: Operation in progress\n", |
| __func__, |
| slot->slot_nr, |
| slot->seq_nr); |
| goto out_retry; |
| case -NFS4ERR_BADSLOT: |
| /* |
| * The slot id we used was probably retired. Try again |
| * using a different slot id. |
| */ |
| goto retry_nowait; |
| case -NFS4ERR_SEQ_MISORDERED: |
| /* |
| * Was the last operation on this sequence interrupted? |
| * If so, retry after bumping the sequence number. |
| */ |
| if (interrupted) { |
| ++slot->seq_nr; |
| goto retry_nowait; |
| } |
| /* |
| * Could this slot have been previously retired? |
| * If so, then the server may be expecting seq_nr = 1! |
| */ |
| if (slot->seq_nr != 1) { |
| slot->seq_nr = 1; |
| goto retry_nowait; |
| } |
| break; |
| case -NFS4ERR_SEQ_FALSE_RETRY: |
| ++slot->seq_nr; |
| goto retry_nowait; |
| default: |
| /* Just update the slot sequence no. */ |
| slot->seq_done = 1; |
| } |
| out: |
| /* The session may be reset by one of the error handlers. */ |
| dprintk("%s: Error %d free the slot \n", __func__, res->sr_status); |
| out_noaction: |
| return ret; |
| retry_nowait: |
| if (rpc_restart_call_prepare(task)) { |
| nfs41_sequence_free_slot(res); |
| task->tk_status = 0; |
| ret = 0; |
| } |
| goto out; |
| out_retry: |
| if (!rpc_restart_call(task)) |
| goto out; |
| rpc_delay(task, NFS4_POLL_RETRY_MAX); |
| return 0; |
| } |
| |
| int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res) |
| { |
| if (!nfs41_sequence_process(task, res)) |
| return 0; |
| if (res->sr_slot != NULL) |
| nfs41_sequence_free_slot(res); |
| return 1; |
| |
| } |
| EXPORT_SYMBOL_GPL(nfs41_sequence_done); |
| |
| static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res) |
| { |
| if (res->sr_slot == NULL) |
| return 1; |
| if (res->sr_slot->table->session != NULL) |
| return nfs41_sequence_process(task, res); |
| return nfs40_sequence_done(task, res); |
| } |
| |
| static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res) |
| { |
| if (res->sr_slot != NULL) { |
| if (res->sr_slot->table->session != NULL) |
| nfs41_sequence_free_slot(res); |
| else |
| nfs40_sequence_free_slot(res); |
| } |
| } |
| |
| int nfs4_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res) |
| { |
| if (res->sr_slot == NULL) |
| return 1; |
| if (!res->sr_slot->table->session) |
| return nfs40_sequence_done(task, res); |
| return nfs41_sequence_done(task, res); |
| } |
| EXPORT_SYMBOL_GPL(nfs4_sequence_done); |
| |
| static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata) |
| { |
| struct nfs4_call_sync_data *data = calldata; |
| |
| dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server); |
| |
| nfs4_setup_sequence(data->seq_server->nfs_client, |
| data->seq_args, data->seq_res, task); |
| } |
| |
| static void nfs41_call_sync_done(struct rpc_task *task, void *calldata) |
| { |
| struct nfs4_call_sync_data *data = calldata; |
| |
| nfs41_sequence_done(task, data->seq_res); |
| } |
| |
| static const struct rpc_call_ops nfs41_call_sync_ops = { |
| .rpc_call_prepare = nfs41_call_sync_prepare, |
| .rpc_call_done = nfs41_call_sync_done, |
| }; |
| |
| #else /* !CONFIG_NFS_V4_1 */ |
| |
| static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res) |
| { |
| return nfs40_sequence_done(task, res); |
| } |
| |
| static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res) |
| { |
| if (res->sr_slot != NULL) |
| nfs40_sequence_free_slot(res); |
| } |
| |
| int nfs4_sequence_done(struct rpc_task *task, |
| struct nfs4_sequence_res *res) |
| { |
| return nfs40_sequence_done(task, res); |
| } |
| EXPORT_SYMBOL_GPL(nfs4_sequence_done); |
| |
| #endif /* !CONFIG_NFS_V4_1 */ |
| |
| int nfs4_setup_sequence(const struct nfs_client *client, |
| struct nfs4_sequence_args *args, |
| struct nfs4_sequence_res *res, |
| struct rpc_task *task) |
| { |
| struct nfs4_session *session = nfs4_get_session(client); |
| struct nfs4_slot_table *tbl = client->cl_slot_tbl; |
| struct nfs4_slot *slot; |
| |
| /* slot already allocated? */ |
| if (res->sr_slot != NULL) |
| goto out_start; |
| |
| if (session) { |
| tbl = &session->fc_slot_table; |
| task->tk_timeout = 0; |
| } |
| |
| spin_lock(&tbl->slot_tbl_lock); |
| /* The state manager will wait until the slot table is empty */ |
| if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged) |
| goto out_sleep; |
| |
| slot = nfs4_alloc_slot(tbl); |
| if (IS_ERR(slot)) { |
| /* Try again in 1/4 second */ |
| if (slot == ERR_PTR(-ENOMEM)) |
| task->tk_timeout = HZ >> 2; |
| goto out_sleep; |
| } |
| spin_unlock(&tbl->slot_tbl_lock); |
| |
| slot->privileged = args->sa_privileged ? 1 : 0; |
| args->sa_slot = slot; |
| |
| res->sr_slot = slot; |
| if (session) { |
| res->sr_timestamp = jiffies; |
| res->sr_status_flags = 0; |
| res->sr_status = 1; |
| } |
| |
| trace_nfs4_setup_sequence(session, args); |
| out_start: |
| rpc_call_start(task); |
| return 0; |
| |
| out_sleep: |
| if (args->sa_privileged) |
| rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task, |
| NULL, RPC_PRIORITY_PRIVILEGED); |
| else |
| rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL); |
| spin_unlock(&tbl->slot_tbl_lock); |
| return -EAGAIN; |
| } |
| EXPORT_SYMBOL_GPL(nfs4_setup_sequence); |
| |
| static void nfs40_call_sync_prepare(struct rpc_task *task, void *calldata) |
| { |
| struct nfs4_call_sync_data *data = calldata; |
| nfs4_setup_sequence(data->seq_server->nfs_client, |
| data->seq_args, data->seq_res, task); |
| } |
| |
| static void nfs40_call_sync_done(struct rpc_task *task, void *calldata) |
| { |
| struct nfs4_call_sync_data *data = calldata; |
| nfs4_sequence_done(task, data->seq_res); |
| } |
| |
| static const struct rpc_call_ops nfs40_call_sync_ops = { |
| .rpc_call_prepare = nfs40_call_sync_prepare, |
| .rpc_call_done = nfs40_call_sync_done, |
| }; |
| |
| static int nfs4_call_sync_sequence(struct rpc_clnt *clnt, |
| struct nfs_server *server, |
| struct rpc_message *msg, |
| struct nfs4_sequence_args *args, |
| struct nfs4_sequence_res *res) |
| { |
| int ret; |
| struct rpc_task *task; |
| struct nfs_client *clp = server->nfs_client; |
| struct nfs4_call_sync_data data = { |
| .seq_server = server, |
| .seq_args = args, |
| .seq_res = res, |
| }; |
| struct rpc_task_setup task_setup = { |
| .rpc_client = clnt, |
| .rpc_message = msg, |
| .callback_ops = clp->cl_mvops->call_sync_ops, |
| .callback_data = &data |
| }; |
| |
| task = rpc_run_task(&task_setup); |
| if (IS_ERR(task)) |
| ret = PTR_ERR(task); |
| else { |
| ret = task->tk_status; |
| rpc_put_task(task); |
| } |
| return ret; |
| } |
| |
| int nfs4_call_sync(struct rpc_clnt *clnt, |
| struct nfs_server *server, |
| struct rpc_message *msg, |
| struct nfs4_sequence_args *args, |
| struct nfs4_sequence_res *res, |
| int cache_reply) |
| { |
| nfs4_init_sequence(args, res, cache_reply); |
| return nfs4_call_sync_sequence(clnt, server, msg, args, res); |
| } |
| |
| static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo, |
| unsigned long timestamp) |
| { |
| struct nfs_inode *nfsi = NFS_I(dir); |
| |
| spin_lock(&dir->i_lock); |
| nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA; |
| if (cinfo->atomic && cinfo->before == dir->i_version) { |
| nfsi->cache_validity &= ~NFS_INO_REVAL_PAGECACHE; |
| nfsi->attrtimeo_timestamp = jiffies; |
| } else { |
| nfs_force_lookup_revalidate(dir); |
| if (cinfo->before != dir->i_version) |
| nfsi->cache_validity |= NFS_INO_INVALID_ACCESS | |
| NFS_INO_INVALID_ACL; |
| } |
| dir->i_version = cinfo->after; |
| nfsi->read_cache_jiffies = timestamp; |
| nfsi->attr_gencount = nfs_inc_attr_generation_counter(); |
| nfs_fscache_invalidate(dir); |
| spin_unlock(&dir->i_lock); |
| } |
| |
| struct nfs4_opendata { |
| struct kref kref; |
| struct nfs_openargs o_arg; |
| struct nfs_openres o_res; |
| struct nfs_open_confirmargs c_arg; |
| struct nfs_open_confirmres c_res; |
| struct nfs4_string owner_name; |
| struct nfs4_string group_name; |
| struct nfs4_label *a_label; |
| struct nfs_fattr f_attr; |
| struct nfs4_label *f_label; |
| struct dentry *dir; |
| struct dentry *dentry; |
| struct nfs4_state_owner *owner; |
| struct nfs4_state *state; |
| struct iattr attrs; |
| unsigned long timestamp; |
| bool rpc_done; |
| bool file_created; |
| bool is_recover; |
| bool cancelled; |
| int rpc_status; |
| }; |
| |
| static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server, |
| int err, struct nfs4_exception *exception) |
| { |
| if (err != -EINVAL) |
| return false; |
| if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1)) |
| return false; |
| server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1; |
| exception->retry = 1; |
| return true; |
| } |
| |
| static u32 |
| nfs4_map_atomic_open_share(struct nfs_server *server, |
| fmode_t fmode, int openflags) |
| { |
| u32 res = 0; |
| |
| switch (fmode & (FMODE_READ | FMODE_WRITE)) { |
| case FMODE_READ: |
| res = NFS4_SHARE_ACCESS_READ; |
| break; |
| case FMODE_WRITE: |
| res = NFS4_SHARE_ACCESS_WRITE; |
| break; |
| case FMODE_READ|FMODE_WRITE: |
| res = NFS4_SHARE_ACCESS_BOTH; |
| } |
| if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1)) |
| goto out; |
| /* Want no delegation if we're using O_DIRECT */ |
| if (openflags & O_DIRECT) |
| res |= NFS4_SHARE_WANT_NO_DELEG; |
| out: |
| return res; |
| } |
| |
| static enum open_claim_type4 |
| nfs4_map_atomic_open_claim(struct nfs_server *server, |
| enum open_claim_type4 claim) |
| { |
| if (server->caps & NFS_CAP_ATOMIC_OPEN_V1) |
| return claim; |
| switch (claim) { |
| default: |
| return claim; |
| case NFS4_OPEN_CLAIM_FH: |
| return NFS4_OPEN_CLAIM_NULL; |
| case NFS4_OPEN_CLAIM_DELEG_CUR_FH: |
| return NFS4_OPEN_CLAIM_DELEGATE_CUR; |
| case NFS4_OPEN_CLAIM_DELEG_PREV_FH: |
| return NFS4_OPEN_CLAIM_DELEGATE_PREV; |
| } |
| } |
| |
| static void nfs4_init_opendata_res(struct nfs4_opendata *p) |
| { |
| p->o_res.f_attr = &p->f_attr; |
| p->o_res.f_label = p->f_label; |
| p->o_res.seqid = p->o_arg.seqid; |
| p->c_res.seqid = p->c_arg.seqid; |
| p->o_res.server = p->o_arg.server; |
| p->o_res.access_request = p->o_arg.access; |
| nfs_fattr_init(&p->f_attr); |
| nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name); |
| } |
| |
| static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry, |
| struct nfs4_state_owner *sp, fmode_t fmode, int flags, |
| const struct iattr *attrs, |
| struct nfs4_label *label, |
| enum open_claim_type4 claim, |
| gfp_t gfp_mask) |
| { |
| struct dentry *parent = dget_parent(dentry); |
| struct inode *dir = d_inode(parent); |
| struct nfs_server *server = NFS_SERVER(dir); |
| struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); |
| struct nfs4_opendata *p; |
| |
| p = kzalloc(sizeof(*p), gfp_mask); |
| if (p == NULL) |
| goto err; |
| |
| p->f_label = nfs4_label_alloc(server, gfp_mask); |
| if (IS_ERR(p->f_label)) |
| goto err_free_p; |
| |
| p->a_label = nfs4_label_alloc(server, gfp_mask); |
| if (IS_ERR(p->a_label)) |
| goto err_free_f; |
| |
| alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid; |
| p->o_arg.seqid = alloc_seqid(&sp->so_seqid, gfp_mask); |
| if (IS_ERR(p->o_arg.seqid)) |
| goto err_free_label; |
| nfs_sb_active(dentry->d_sb); |
| p->dentry = dget(dentry); |
| p->dir = parent; |
| p->owner = sp; |
| atomic_inc(&sp->so_count); |
| p->o_arg.open_flags = flags; |
| p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE); |
| p->o_arg.umask = current_umask(); |
| p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim); |
| p->o_arg.share_access = nfs4_map_atomic_open_share(server, |
| fmode, flags); |
| /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS |
| * will return permission denied for all bits until close */ |
| if (!(flags & O_EXCL)) { |
| /* ask server to check for all possible rights as results |
| * are cached */ |
| switch (p->o_arg.claim) { |
| default: |
| break; |
| case NFS4_OPEN_CLAIM_NULL: |
| case NFS4_OPEN_CLAIM_FH: |
| p->o_arg.access = NFS4_ACCESS_READ | |
| NFS4_ACCESS_MODIFY | |
| NFS4_ACCESS_EXTEND | |
| NFS4_ACCESS_EXECUTE; |
| } |
| } |
| p->o_arg.clientid = server->nfs_client->cl_clientid; |
| p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time); |
| p->o_arg.id.uniquifier = sp->so_seqid.owner_id; |
| p->o_arg.name = &dentry->d_name; |
| p->o_arg.server = server; |
| p->o_arg.bitmask = nfs4_bitmask(server, label); |
| p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0]; |
| p->o_arg.label = nfs4_label_copy(p->a_label, label); |
| switch (p->o_arg.claim) { |
| case NFS4_OPEN_CLAIM_NULL: |
| case NFS4_OPEN_CLAIM_DELEGATE_CUR: |
| case NFS4_OPEN_CLAIM_DELEGATE_PREV: |
| p->o_arg.fh = NFS_FH(dir); |
| break; |
| case NFS4_OPEN_CLAIM_PREVIOUS: |
| case NFS4_OPEN_CLAIM_FH: |
| case NFS4_OPEN_CLAIM_DELEG_CUR_FH: |
| case NFS4_OPEN_CLAIM_DELEG_PREV_FH: |
| p->o_arg.fh = NFS_FH(d_inode(dentry)); |
| } |
| if (attrs != NULL && attrs->ia_valid != 0) { |
| __u32 verf[2]; |
| |
| p->o_arg.u.attrs = &p->attrs; |
| memcpy(&p->attrs, attrs, sizeof(p->attrs)); |
| |
| verf[0] = jiffies; |
| verf[1] = current->pid; |
| memcpy(p->o_arg.u.verifier.data, verf, |
| sizeof(p->o_arg.u.verifier.data)); |
| } |
| p->c_arg.fh = &p->o_res.fh; |
| p->c_arg.stateid = &p->o_res.stateid; |
| p->c_arg.seqid = p->o_arg.seqid; |
| nfs4_init_opendata_res(p); |
| kref_init(&p->kref); |
| return p; |
| |
| err_free_label: |
| nfs4_label_free(p->a_label); |
| err_free_f: |
| nfs4_label_free(p->f_label); |
| err_free_p: |
| kfree(p); |
| err: |
| dput(parent); |
| return NULL; |
| } |
| |
| static void nfs4_opendata_free(struct kref *kref) |
| { |
| struct nfs4_opendata *p = container_of(kref, |
| struct nfs4_opendata, kref); |
| struct super_block *sb = p->dentry->d_sb; |
| |
| nfs_free_seqid(p->o_arg.seqid); |
| nfs4_sequence_free_slot(&p->o_res.seq_res); |
| if (p->state != NULL) |
| nfs4_put_open_state(p->state); |
| nfs4_put_state_owner(p->owner); |
| |
| nfs4_label_free(p->a_label); |
| nfs4_label_free(p->f_label); |
| |
| dput(p->dir); |
| dput(p->dentry); |
| nfs_sb_deactive(sb); |
| nfs_fattr_free_names(&p->f_attr); |
| kfree(p->f_attr.mdsthreshold); |
| kfree(p); |
| } |
| |
| static void nfs4_opendata_put(struct nfs4_opendata *p) |
| { |
| if (p != NULL) |
| kref_put(&p->kref, nfs4_opendata_free); |
| } |
| |
| static bool nfs4_mode_match_open_stateid(struct nfs4_state *state, |
| fmode_t fmode) |
| { |
| switch(fmode & (FMODE_READ|FMODE_WRITE)) { |
| case FMODE_READ|FMODE_WRITE: |
| return state->n_rdwr != 0; |
| case FMODE_WRITE: |
| return state->n_wronly != 0; |
| case FMODE_READ: |
| return state->n_rdonly != 0; |
| } |
| WARN_ON_ONCE(1); |
| return false; |
| } |
| |
| static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode) |
| { |
| int ret = 0; |
| |
| if (open_mode & (O_EXCL|O_TRUNC)) |
| goto out; |
| switch (mode & (FMODE_READ|FMODE_WRITE)) { |
| case FMODE_READ: |
| ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0 |
| && state->n_rdonly != 0; |
| break; |
| case FMODE_WRITE: |
| ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0 |
| && state->n_wronly != 0; |
| break; |
| case FMODE_READ|FMODE_WRITE: |
| ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0 |
| && state->n_rdwr != 0; |
| } |
| out: |
| return ret; |
| } |
| |
| static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode, |
| enum open_claim_type4 claim) |
| { |
| if (delegation == NULL) |
| return 0; |
| if ((delegation->type & fmode) != fmode) |
| return 0; |
| if (test_bit(NFS_DELEGATION_RETURNING, &delegation->flags)) |
| return 0; |
| switch (claim) { |
| case NFS4_OPEN_CLAIM_NULL: |
| case NFS4_OPEN_CLAIM_FH: |
| break; |
| case NFS4_OPEN_CLAIM_PREVIOUS: |
| if (!test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags)) |
| break; |
| default: |
| return 0; |
| } |
| nfs_mark_delegation_referenced(delegation); |
| return 1; |
| } |
| |
| static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode) |
| { |
| switch (fmode) { |
| case FMODE_WRITE: |
| state->n_wronly++; |
| break; |
| case FMODE_READ: |
| state->n_rdonly++; |
| break; |
| case FMODE_READ|FMODE_WRITE: |
| state->n_rdwr++; |
| } |
| nfs4_state_set_mode_locked(state, state->state | fmode); |
| } |
| |
| #ifdef CONFIG_NFS_V4_1 |
| static bool nfs_open_stateid_recover_openmode(struct nfs4_state *state) |
| { |
| if (state->n_rdonly && !test_bit(NFS_O_RDONLY_STATE, &state->flags)) |
| return true; |
| if (state->n_wronly && !test_bit(NFS_O_WRONLY_STATE, &state->flags)) |
| return true; |
| if (state->n_rdwr && !test_bit(NFS_O_RDWR_STATE, &state->flags)) |
| return true; |
| return false; |
| } |
| #endif /* CONFIG_NFS_V4_1 */ |
| |
| static void nfs_test_and_clear_all_open_stateid(struct nfs4_state *state) |
| { |
| struct nfs_client *clp = state->owner->so_server->nfs_client; |
| bool need_recover = false; |
| |
| if (test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags) && state->n_rdonly) |
| need_recover = true; |
| if (test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags) && state->n_wronly) |
| need_recover = true; |
| if (test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags) && state->n_rdwr) |
| need_recover = true; |
| if (need_recover) |
| nfs4_state_mark_reclaim_nograce(clp, state); |
| } |
| |
| static bool nfs_need_update_open_stateid(struct nfs4_state *state, |
| const nfs4_stateid *stateid, nfs4_stateid *freeme) |
| { |
| if (test_and_set_bit(NFS_OPEN_STATE, &state->flags) == 0) |
| return true; |
| if (!nfs4_stateid_match_other(stateid, &state->open_stateid)) { |
| nfs4_stateid_copy(freeme, &state->open_stateid); |
| nfs_test_and_clear_all_open_stateid(state); |
| return true; |
| } |
| if (nfs4_stateid_is_newer(stateid, &state->open_stateid)) |
| return true; |
| return false; |
| } |
| |
| static void nfs_resync_open_stateid_locked(struct nfs4_state *state) |
| { |
| if (!(state->n_wronly || state->n_rdonly || state->n_rdwr)) |
| return; |
| if (state->n_wronly) |
| set_bit(NFS_O_WRONLY_STATE, &state->flags); |
| if (state->n_rdonly) |
| set_bit(NFS_O_RDONLY_STATE, &state->flags); |
| if (state->n_rdwr) |
| set_bit(NFS_O_RDWR_STATE, &state->flags); |
| set_bit(NFS_OPEN_STATE, &state->flags); |
| } |
| |
| static void nfs_clear_open_stateid_locked(struct nfs4_state *state, |
| nfs4_stateid *stateid, fmode_t fmode) |
| { |
| clear_bit(NFS_O_RDWR_STATE, &state->flags); |
| switch (fmode & (FMODE_READ|FMODE_WRITE)) { |
| case FMODE_WRITE: |
| clear_bit(NFS_O_RDONLY_STATE, &state->flags); |
| break; |
| case FMODE_READ: |
| clear_bit(NFS_O_WRONLY_STATE, &state->flags); |
| break; |
| case 0: |
| clear_bit(NFS_O_RDONLY_STATE, &state->flags); |
| clear_bit(NFS_O_WRONLY_STATE, &state->flags); |
| clear_bit(NFS_OPEN_STATE, &state->flags); |
| } |
| if (stateid == NULL) |
| return; |
| /* Handle OPEN+OPEN_DOWNGRADE races */ |
| if (nfs4_stateid_match_other(stateid, &state->open_stateid) && |
| !nfs4_stateid_is_newer(stateid, &state->open_stateid)) { |
| nfs_resync_open_stateid_locked(state); |
| return; |
| } |
| if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0) |
| nfs4_stateid_copy(&state->stateid, stateid); |
| nfs4_stateid_copy(&state->open_stateid, stateid); |
| } |
| |
| static void nfs_clear_open_stateid(struct nfs4_state *state, |
| nfs4_stateid *arg_stateid, |
| nfs4_stateid *stateid, fmode_t fmode) |
| { |
| write_seqlock(&state->seqlock); |
| /* Ignore, if the CLOSE argment doesn't match the current stateid */ |
| if (nfs4_state_match_open_stateid_other(state, arg_stateid)) |
| nfs_clear_open_stateid_locked(state, stateid, fmode); |
| write_sequnlock(&state->seqlock); |
| if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) |
| nfs4_schedule_state_manager(state->owner->so_server->nfs_client); |
| } |
| |
| static void nfs_set_open_stateid_locked(struct nfs4_state *state, |
| const nfs4_stateid *stateid, fmode_t fmode, |
| nfs4_stateid *freeme) |
| { |
| switch (fmode) { |
| case FMODE_READ: |
| set_bit(NFS_O_RDONLY_STATE, &state->flags); |
| break; |
| case FMODE_WRITE: |
| set_bit(NFS_O_WRONLY_STATE, &state->flags); |
| break; |
| case FMODE_READ|FMODE_WRITE: |
| set_bit(NFS_O_RDWR_STATE, &state->flags); |
| } |
| if (!nfs_need_update_open_stateid(state, stateid, freeme)) |
| return; |
| if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0) |
| nfs4_stateid_copy(&state->stateid, stateid); |
| nfs4_stateid_copy(&state->open_stateid, stateid); |
| } |
| |
| static void __update_open_stateid(struct nfs4_state *state, |
| const nfs4_stateid *open_stateid, |
| const nfs4_stateid *deleg_stateid, |
| fmode_t fmode, |
| nfs4_stateid *freeme) |
| { |
| /* |
| * Protect the call to nfs4_state_set_mode_locked and |
| * serialise the stateid update |
| */ |
| spin_lock(&state->owner->so_lock); |
| write_seqlock(&state->seqlock); |
| if (deleg_stateid != NULL) { |
| nfs4_stateid_copy(&state->stateid, deleg_stateid); |
| set_bit(NFS_DELEGATED_STATE, &state->flags); |
| } |
| if (open_stateid != NULL) |
| nfs_set_open_stateid_locked(state, open_stateid, fmode, freeme); |
| write_sequnlock(&state->seqlock); |
| update_open_stateflags(state, fmode); |
| spin_unlock(&state->owner->so_lock); |
| } |
| |
| static int update_open_stateid(struct nfs4_state *state, |
| const nfs4_stateid *open_stateid, |
| const nfs4_stateid *delegation, |
| fmode_t fmode) |
| { |
| struct nfs_server *server = NFS_SERVER(state->inode); |
| struct nfs_client *clp = server->nfs_client; |
| struct nfs_inode *nfsi = NFS_I(state->inode); |
| struct nfs_delegation *deleg_cur; |
| nfs4_stateid freeme = { }; |
| int ret = 0; |
| |
| fmode &= (FMODE_READ|FMODE_WRITE); |
| |
| rcu_read_lock(); |
| deleg_cur = rcu_dereference(nfsi->delegation); |
| if (deleg_cur == NULL) |
| goto no_delegation; |
| |
| spin_lock(&deleg_cur->lock); |
| if (rcu_dereference(nfsi->delegation) != deleg_cur || |
| test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) || |
| (deleg_cur->type & fmode) != fmode) |
| goto no_delegation_unlock; |
| |
| if (delegation == NULL) |
| delegation = &deleg_cur->stateid; |
| else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation)) |
| goto no_delegation_unlock; |
| |
| nfs_mark_delegation_referenced(deleg_cur); |
| __update_open_stateid(state, open_stateid, &deleg_cur->stateid, |
| fmode, &freeme); |
| ret = 1; |
| no_delegation_unlock: |
| spin_unlock(&deleg_cur->lock); |
| no_delegation: |
| rcu_read_unlock(); |
| |
| if (!ret && open_stateid != NULL) { |
| __update_open_stateid(state, open_stateid, NULL, fmode, &freeme); |
| ret = 1; |
| } |
| if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) |
| nfs4_schedule_state_manager(clp); |
| if (freeme.type != 0) |
| nfs4_test_and_free_stateid(server, &freeme, |
| state->owner->so_cred); |
| |
| return ret; |
| } |
| |
| static bool nfs4_update_lock_stateid(struct nfs4_lock_state *lsp, |
| const nfs4_stateid *stateid) |
| { |
| struct nfs4_state *state = lsp->ls_state; |
| bool ret = false; |
| |
| spin_lock(&state->state_lock); |
| if (!nfs4_stateid_match_other(stateid, &lsp->ls_stateid)) |
| goto out_noupdate; |
| if (!nfs4_stateid_is_newer(stateid, &lsp->ls_stateid)) |
| goto out_noupdate; |
| nfs4_stateid_copy(&lsp->ls_stateid, stateid); |
| ret = true; |
| out_noupdate: |
| spin_unlock(&state->state_lock); |
| return ret; |
| } |
| |
| static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode) |
| { |
| struct nfs_delegation *delegation; |
| |
| rcu_read_lock(); |
| delegation = rcu_dereference(NFS_I(inode)->delegation); |
| if (delegation == NULL || (delegation->type & fmode) == fmode) { |
| rcu_read_unlock(); |
| return; |
| } |
| rcu_read_unlock(); |
| nfs4_inode_return_delegation(inode); |
| } |
| |
| static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata) |
| { |
| struct nfs4_state *state = opendata->state; |
| struct nfs_inode *nfsi = NFS_I(state->inode); |
| struct nfs_delegation *delegation; |
| int open_mode = opendata->o_arg.open_flags; |
| fmode_t fmode = opendata->o_arg.fmode; |
| enum open_claim_type4 claim = opendata->o_arg.claim; |
| nfs4_stateid stateid; |
| int ret = -EAGAIN; |
| |
| for (;;) { |
| spin_lock(&state->owner->so_lock); |
| if (can_open_cached(state, fmode, open_mode)) { |
| update_open_stateflags(state, fmode); |
| spin_unlock(&state->owner->so_lock); |
| goto out_return_state; |
| } |
| spin_unlock(&state->owner->so_lock); |
| rcu_read_lock(); |
| delegation = rcu_dereference(nfsi->delegation); |
| if (!can_open_delegated(delegation, fmode, claim)) { |
| rcu_read_unlock(); |
| break; |
| } |
| /* Save the delegation */ |
| nfs4_stateid_copy(&stateid, &delegation->stateid); |
| rcu_read_unlock(); |
| nfs_release_seqid(opendata->o_arg.seqid); |
| if (!opendata->is_recover) { |
| ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode); |
| if (ret != 0) |
| goto out; |
| } |
| ret = -EAGAIN; |
| |
| /* Try to update the stateid using the delegation */ |
| if (update_open_stateid(state, NULL, &stateid, fmode)) |
| goto out_return_state; |
| } |
| out: |
| return ERR_PTR(ret); |
| out_return_state: |
| atomic_inc(&state->count); |
| return state; |
| } |
| |
| static void |
| nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state) |
| { |
| struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client; |
| struct nfs_delegation *delegation; |
| int delegation_flags = 0; |
| |
| rcu_read_lock(); |
| delegation = rcu_dereference(NFS_I(state->inode)->delegation); |
| if (delegation) |
| delegation_flags = delegation->flags; |
| rcu_read_unlock(); |
| switch (data->o_arg.claim) { |
| default: |
| break; |
| case NFS4_OPEN_CLAIM_DELEGATE_CUR: |
| case NFS4_OPEN_CLAIM_DELEG_CUR_FH: |
| pr_err_ratelimited("NFS: Broken NFSv4 server %s is " |
| "returning a delegation for " |
| "OPEN(CLAIM_DELEGATE_CUR)\n", |
| clp->cl_hostname); |
| return; |
| } |
| if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0) |
| nfs_inode_set_delegation(state->inode, |
| data->owner->so_cred, |
| &data->o_res); |
| else |
| nfs_inode_reclaim_delegation(state->inode, |
| data->owner->so_cred, |
| &data->o_res); |
| } |
| |
| /* |
| * Check the inode attributes against the CLAIM_PREVIOUS returned attributes |
| * and update the nfs4_state. |
| */ |
| static struct nfs4_state * |
| _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data) |
| { |
| struct inode *inode = data->state->inode; |
| struct nfs4_state *state = data->state; |
| int ret; |
| |
| if (!data->rpc_done) { |
| if (data->rpc_status) |
| return ERR_PTR(data->rpc_status); |
| /* cached opens have already been processed */ |
| goto update; |
| } |
| |
| ret = nfs_refresh_inode(inode, &data->f_attr); |
| if (ret) |
| return ERR_PTR(ret); |
| |
| if (data->o_res.delegation_type != 0) |
| nfs4_opendata_check_deleg(data, state); |
| update: |
| update_open_stateid(state, &data->o_res.stateid, NULL, |
| data->o_arg.fmode); |
| atomic_inc(&state->count); |
| |
| return state; |
| } |
| |
| static struct inode * |
| nfs4_opendata_get_inode(struct nfs4_opendata *data) |
| { |
| struct inode *inode; |
| |
| switch (data->o_arg.claim) { |
| case NFS4_OPEN_CLAIM_NULL: |
| case NFS4_OPEN_CLAIM_DELEGATE_CUR: |
| case NFS4_OPEN_CLAIM_DELEGATE_PREV: |
| if (!(data->f_attr.valid & NFS_ATTR_FATTR)) |
| return ERR_PTR(-EAGAIN); |
| inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, |
| &data->f_attr, data->f_label); |
| break; |
| default: |
| inode = d_inode(data->dentry); |
| ihold(inode); |
| nfs_refresh_inode(inode, &data->f_attr); |
| } |
| return inode; |
| } |
| |
| static struct nfs4_state * |
| nfs4_opendata_find_nfs4_state(struct nfs4_opendata *data) |
| { |
| struct nfs4_state *state; |
| struct inode *inode; |
| |
| inode = nfs4_opendata_get_inode(data); |
| if (IS_ERR(inode)) |
| return ERR_CAST(inode); |
| if (data->state != NULL && data->state->inode == inode) { |
| state = data->state; |
| atomic_inc(&state->count); |
| } else |
| state = nfs4_get_open_state(inode, data->owner); |
| iput(inode); |
| if (state == NULL) |
| state = ERR_PTR(-ENOMEM); |
| return state; |
| } |
| |
| static struct nfs4_state * |
| _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data) |
| { |
| struct nfs4_state *state; |
| |
| if (!data->rpc_done) { |
| state = nfs4_try_open_cached(data); |
| trace_nfs4_cached_open(data->state); |
| goto out; |
| } |
| |
| state = nfs4_opendata_find_nfs4_state(data); |
| if (IS_ERR(state)) |
| goto out; |
| |
| if (data->o_res.delegation_type != 0) |
| nfs4_opendata_check_deleg(data, state); |
| update_open_stateid(state, &data->o_res.stateid, NULL, |
| data->o_arg.fmode); |
| out: |
| nfs_release_seqid(data->o_arg.seqid); |
| return state; |
| } |
| |
| static struct nfs4_state * |
| nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data) |
| { |
| struct nfs4_state *ret; |
| |
| if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) |
| ret =_nfs4_opendata_reclaim_to_nfs4_state(data); |
| else |
| ret = _nfs4_opendata_to_nfs4_state(data); |
| nfs4_sequence_free_slot(&data->o_res.seq_res); |
| return ret; |
| } |
| |
| static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state) |
| { |
| struct nfs_inode *nfsi = NFS_I(state->inode); |
| struct nfs_open_context *ctx; |
| |
| spin_lock(&state->inode->i_lock); |
| list_for_each_entry(ctx, &nfsi->open_files, list) { |
| if (ctx->state != state) |
| continue; |
| get_nfs_open_context(ctx); |
| spin_unlock(&state->inode->i_lock); |
| return ctx; |
| } |
| spin_unlock(&state->inode->i_lock); |
| return ERR_PTR(-ENOENT); |
| } |
| |
| static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, |
| struct nfs4_state *state, enum open_claim_type4 claim) |
| { |
| struct nfs4_opendata *opendata; |
| |
| opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0, |
| NULL, NULL, claim, GFP_NOFS); |
| if (opendata == NULL) |
| return ERR_PTR(-ENOMEM); |
| opendata->state = state; |
| atomic_inc(&state->count); |
| return opendata; |
| } |
| |
| static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, |
| fmode_t fmode) |
| { |
| struct nfs4_state *newstate; |
| int ret; |
| |
| if (!nfs4_mode_match_open_stateid(opendata->state, fmode)) |
| return 0; |
| opendata->o_arg.open_flags = 0; |
| opendata->o_arg.fmode = fmode; |
| opendata->o_arg.share_access = nfs4_map_atomic_open_share( |
| NFS_SB(opendata->dentry->d_sb), |
| fmode, 0); |
| memset(&opendata->o_res, 0, sizeof(opendata->o_res)); |
| memset(&opendata->c_res, 0, sizeof(opendata->c_res)); |
| nfs4_init_opendata_res(opendata); |
| ret = _nfs4_recover_proc_open(opendata); |
| if (ret != 0) |
| return ret; |
| newstate = nfs4_opendata_to_nfs4_state(opendata); |
| if (IS_ERR(newstate)) |
| return PTR_ERR(newstate); |
| if (newstate != opendata->state) |
| ret = -ESTALE; |
| nfs4_close_state(newstate, fmode); |
| return ret; |
| } |
| |
| static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state) |
| { |
| int ret; |
| |
| /* Don't trigger recovery in nfs_test_and_clear_all_open_stateid */ |
| clear_bit(NFS_O_RDWR_STATE, &state->flags); |
| clear_bit(NFS_O_WRONLY_STATE, &state->flags); |
| clear_bit(NFS_O_RDONLY_STATE, &state->flags); |
| /* memory barrier prior to reading state->n_* */ |
| clear_bit(NFS_DELEGATED_STATE, &state->flags); |
| clear_bit(NFS_OPEN_STATE, &state->flags); |
| smp_rmb(); |
| ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE); |
| if (ret != 0) |
| return ret; |
| ret = nfs4_open_recover_helper(opendata, FMODE_WRITE); |
| if (ret != 0) |
| return ret; |
| ret = nfs4_open_recover_helper(opendata, FMODE_READ); |
| if (ret != 0) |
| return ret; |
| /* |
| * We may have performed cached opens for all three recoveries. |
| * Check if we need to update the current stateid. |
| */ |
| if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 && |
| !nfs4_stateid_match(&state->stateid, &state->open_stateid)) { |
| write_seqlock(&state->seqlock); |
| if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0) |
| nfs4_stateid_copy(&state->stateid, &state->open_stateid); |
| write_sequnlock(&state->seqlock); |
| } |
| return 0; |
| } |
| |
| /* |
| * OPEN_RECLAIM: |
| * reclaim state on the server after a reboot. |
| */ |
| static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state) |
| { |
| struct nfs_delegation *delegation; |
| struct nfs4_opendata *opendata; |
| fmode_t delegation_type = 0; |
| int status; |
| |
| opendata = nfs4_open_recoverdata_alloc(ctx, state, |
| NFS4_OPEN_CLAIM_PREVIOUS); |
| if (IS_ERR(opendata)) |
| return PTR_ERR(opendata); |
| rcu_read_lock(); |
| delegation = rcu_dereference(NFS_I(state->inode)->delegation); |
| if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0) |
| delegation_type = delegation->type; |
| rcu_read_unlock(); |
| opendata->o_arg.u.delegation_type = delegation_type; |
| status = nfs4_open_recover(opendata, state); |
| nfs4_opendata_put(opendata); |
| return status; |
| } |
| |
| static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state) |
| { |
| struct nfs_server *server = NFS_SERVER(state->inode); |
| struct nfs4_exception exception = { }; |
| int err; |
| do { |
| err = _nfs4_do_open_reclaim(ctx, state); |
| trace_nfs4_open_reclaim(ctx, 0, err); |
| if (nfs4_clear_cap_atomic_open_v1(server, err, &exception)) |
| continue; |
| if (err != -NFS4ERR_DELAY) |
| break; |
| nfs4_handle_exception(server, err, &exception); |
| } while (exception.retry); |
| return err; |
| } |
| |
| static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state) |
| { |
| struct nfs_open_context *ctx; |
| int ret; |
| |
| ctx = nfs4_state_find_open_context(state); |
| if (IS_ERR(ctx)) |
| return -EAGAIN; |
| ret = nfs4_do_open_reclaim(ctx, state); |
| put_nfs_open_context(ctx); |
| return ret; |
| } |
| |
| static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct nfs4_state *state, const nfs4_stateid *stateid, int err) |
| { |
| switch (err) { |
| default: |
| printk(KERN_ERR "NFS: %s: unhandled error " |
| "%d.\n", __func__, err); |
| case 0: |
| case -ENOENT: |
| case -EAGAIN: |
| case -ESTALE: |
| break; |
| case -NFS4ERR_BADSESSION: |
| case -NFS4ERR_BADSLOT: |
| case -NFS4ERR_BAD_HIGH_SLOT: |
| case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: |
| case -NFS4ERR_DEADSESSION: |
| set_bit(NFS_DELEGATED_STATE, &state->flags); |
| nfs4_schedule_session_recovery(server->nfs_client->cl_session, err); |
| return -EAGAIN; |
| case -NFS4ERR_STALE_CLIENTID: |
| case -NFS4ERR_STALE_STATEID: |
| set_bit(NFS_DELEGATED_STATE, &state->flags); |
| /* Don't recall a delegation if it was lost */ |
| nfs4_schedule_lease_recovery(server->nfs_client); |
| return -EAGAIN; |
| case -NFS4ERR_MOVED: |
| nfs4_schedule_migration_recovery(server); |
| return -EAGAIN; |
| case -NFS4ERR_LEASE_MOVED: |
| nfs4_schedule_lease_moved_recovery(server->nfs_client); |
| return -EAGAIN; |
| case -NFS4ERR_DELEG_REVOKED: |
| case -NFS4ERR_ADMIN_REVOKED: |
| case -NFS4ERR_EXPIRED: |
| case -NFS4ERR_BAD_STATEID: |
| case -NFS4ERR_OPENMODE: |
| nfs_inode_find_state_and_recover(state->inode, |
| stateid); |
| nfs4_schedule_stateid_recovery(server, state); |
| return -EAGAIN; |
| case -NFS4ERR_DELAY: |
| case -NFS4ERR_GRACE: |
| set_bit(NFS_DELEGATED_STATE, &state->flags); |
| ssleep(1); |
| return -EAGAIN; |
| case -ENOMEM: |
| case -NFS4ERR_DENIED: |
| /* kill_proc(fl->fl_pid, SIGLOST, 1); */ |
| return 0; |
| } |
| return err; |
| } |
| |
| int nfs4_open_delegation_recall(struct nfs_open_context *ctx, |
| struct nfs4_state *state, const nfs4_stateid *stateid, |
| fmode_t type) |
| { |
| struct nfs_server *server = NFS_SERVER(state->inode); |
| struct nfs4_opendata *opendata; |
| int err = 0; |
| |
| opendata = nfs4_open_recoverdata_alloc(ctx, state, |
| NFS4_OPEN_CLAIM_DELEG_CUR_FH); |
| if (IS_ERR(opendata)) |
| return PTR_ERR(opendata); |
| nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid); |
| write_seqlock(&state->seqlock); |
| nfs4_stateid_copy(&state->stateid, &state->open_stateid); |
| write_sequnlock(&state->seqlock); |
| clear_bit(NFS_DELEGATED_STATE, &state->flags); |
| switch (type & (FMODE_READ|FMODE_WRITE)) { |
| case FMODE_READ|FMODE_WRITE: |
| case FMODE_WRITE: |
| err = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE); |
| if (err) |
| break; |
| err = nfs4_open_recover_helper(opendata, FMODE_WRITE); |
| if (err) |
| break; |
| case FMODE_READ: |
| err = nfs4_open_recover_helper(opendata, FMODE_READ); |
| } |
| nfs4_opendata_put(opendata); |
| return nfs4_handle_delegation_recall_error(server, state, stateid, err); |
| } |
| |
| static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata) |
| { |
| struct nfs4_opendata *data = calldata; |
| |
| nfs4_setup_sequence(data->o_arg.server->nfs_client, |
| &data->c_arg.seq_args, &data->c_res.seq_res, task); |
| } |
| |
| static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata) |
| { |
| struct nfs4_opendata *data = calldata; |
| |
| nfs40_sequence_done(task, &data->c_res.seq_res); |
| |
| data->rpc_status = task->tk_status; |
| if (data->rpc_status == 0) { |
| nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid); |
| nfs_confirm_seqid(&data->owner->so_seqid, 0); |
| renew_lease(data->o_res.server, data->timestamp); |
| data->rpc_done = true; |
| } |
| } |
| |
| static void nfs4_open_confirm_release(void *calldata) |
| { |
| struct nfs4_opendata *data = calldata; |
| struct nfs4_state *state = NULL; |
| |
| /* If this request hasn't been cancelled, do nothing */ |
| if (!data->cancelled) |
| goto out_free; |
| /* In case of error, no cleanup! */ |
| if (!data->rpc_done) |
| goto out_free; |
| state = nfs4_opendata_to_nfs4_state(data); |
| if (!IS_ERR(state)) |
| nfs4_close_state(state, data->o_arg.fmode); |
| out_free: |
| nfs4_opendata_put(data); |
| } |
| |
| static const struct rpc_call_ops nfs4_open_confirm_ops = { |
| .rpc_call_prepare = nfs4_open_confirm_prepare, |
| .rpc_call_done = nfs4_open_confirm_done, |
| .rpc_release = nfs4_open_confirm_release, |
| }; |
| |
| /* |
| * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata |
| */ |
| static int _nfs4_proc_open_confirm(struct nfs4_opendata *data) |
| { |
| struct nfs_server *server = NFS_SERVER(d_inode(data->dir)); |
| struct rpc_task *task; |
| struct rpc_message msg = { |
| .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM], |
| .rpc_argp = &data->c_arg, |
| .rpc_resp = &data->c_res, |
| .rpc_cred = data->owner->so_cred, |
| }; |
| struct rpc_task_setup task_setup_data = { |
| .rpc_client = server->client, |
| .rpc_message = &msg, |
| .callback_ops = &nfs4_open_confirm_ops, |
| .callback_data = data, |
| .workqueue = nfsiod_workqueue, |
| .flags = RPC_TASK_ASYNC, |
| }; |
| int status; |
| |
| nfs4_init_sequence(&data->c_arg.seq_args, &data->c_res.seq_res, 1); |
| kref_get(&data->kref); |
| data->rpc_done = false; |
| data->rpc_status = 0; |
| data->timestamp = jiffies; |
| if (data->is_recover) |
| nfs4_set_sequence_privileged(&data->c_arg.seq_args); |
| task = rpc_run_task(&task_setup_data); |
| if (IS_ERR(task)) |
| return PTR_ERR(task); |
| status = rpc_wait_for_completion_task(task); |
| if (status != 0) { |
| data->cancelled = true; |
| smp_wmb(); |
| } else |
| status = data->rpc_status; |
| rpc_put_task(task); |
| return status; |
| } |
| |
| static void nfs4_open_prepare(struct rpc_task *task, void *calldata) |
| { |
| struct nfs4_opendata *data = calldata; |
| struct nfs4_state_owner *sp = data->owner; |
| struct nfs_client *clp = sp->so_server->nfs_client; |
| enum open_claim_type4 claim = data->o_arg.claim; |
| |
| if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0) |
| goto out_wait; |
| /* |
| * Check if we still need to send an OPEN call, or if we can use |
| * a delegation instead. |
| */ |
| if (data->state != NULL) { |
| struct nfs_delegation *delegation; |
| |
| if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags)) |
| goto out_no_action; |
| rcu_read_lock(); |
| delegation = rcu_dereference(NFS_I(data->state->inode)->delegation); |
| if (can_open_delegated(delegation, data->o_arg.fmode, claim)) |
| goto unlock_no_action; |
| rcu_read_unlock(); |
| } |
| /* Update client id. */ |
| data->o_arg.clientid = clp->cl_clientid; |
| switch (claim) { |
| default: |
| break; |
| case NFS4_OPEN_CLAIM_PREVIOUS: |
| case NFS4_OPEN_CLAIM_DELEG_CUR_FH: |
| case NFS4_OPEN_CLAIM_DELEG_PREV_FH: |
| data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0]; |
| case NFS4_OPEN_CLAIM_FH: |
| task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR]; |
| } |
| data->timestamp = jiffies; |
| if (nfs4_setup_sequence(data->o_arg.server->nfs_client, |
| &data->o_arg.seq_args, |
| &data->o_res.seq_res, |
| task) != 0) |
| nfs_release_seqid(data->o_arg.seqid); |
| |
| /* Set the create mode (note dependency on the session type) */ |
| data->o_arg.createmode = NFS4_CREATE_UNCHECKED; |
| if (data->o_arg.open_flags & O_EXCL) { |
| data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE; |
| if (nfs4_has_persistent_session(clp)) |
| data->o_arg.createmode = NFS4_CREATE_GUARDED; |
| else if (clp->cl_mvops->minor_version > 0) |
| data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1; |
| } |
| return; |
| unlock_no_action: |
| trace_nfs4_cached_open(data->state); |
| rcu_read_unlock(); |
| out_no_action: |
| task->tk_action = NULL; |
| out_wait: |
| nfs4_sequence_done(task, &data->o_res.seq_res); |
| } |
| |
| static void nfs4_open_done(struct rpc_task *task, void *calldata) |
| { |
| struct nfs4_opendata *data = calldata; |
| |
| data->rpc_status = task->tk_status; |
| |
| if (!nfs4_sequence_process(task, &data->o_res.seq_res)) |
| return; |
| |
| if (task->tk_status == 0) { |
| if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) { |
| switch (data->o_res.f_attr->mode & S_IFMT) { |
| case S_IFREG: |
| break; |
| case S_IFLNK: |
| data->rpc_status = -ELOOP; |
| break; |
| case S_IFDIR: |
| data->rpc_status = -EISDIR; |
| break; |
| default: |
| data->rpc_status = -ENOTDIR; |
| } |
| } |
| renew_lease(data->o_res.server, data->timestamp); |
| if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)) |
| nfs_confirm_seqid(&data->owner->so_seqid, 0); |
| } |
| data->rpc_done = true; |
| } |
| |
| static void nfs4_open_release(void *calldata) |
| { |
| struct nfs4_opendata *data = calldata; |
| struct nfs4_state *state = NULL; |
| |
| /* If this request hasn't been cancelled, do nothing */ |
| if (!data->cancelled) |
| goto out_free; |
| /* In case of error, no cleanup! */ |
| if (data->rpc_status != 0 || !data->rpc_done) |
| goto out_free; |
| /* In case we need an open_confirm, no cleanup! */ |
| if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM) |
| goto out_free; |
| state = nfs4_opendata_to_nfs4_state(data); |
| if (!IS_ERR(state)) |
| nfs4_close_state(state, data->o_arg.fmode); |
| out_free: |
| nfs4_opendata_put(data); |
| } |
| |
| static const struct rpc_call_ops nfs4_open_ops = { |
| .rpc_call_prepare = nfs4_open_prepare, |
| .rpc_call_done = nfs4_open_done, |
| .rpc_release = nfs4_open_release, |
| }; |
| |
| static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover) |
| { |
| struct inode *dir = d_inode(data->dir); |
| struct nfs_server *server = NFS_SERVER(dir); |
| struct nfs_openargs *o_arg = &data->o_arg; |
| struct nfs_openres *o_res = &data->o_res; |
| struct rpc_task *task; |
| struct rpc_message msg = { |
| .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN], |
| .rpc_argp = o_arg, |
| .rpc_resp = o_res, |
| .rpc_cred = data->owner->so_cred, |
| }; |
| struct rpc_task_setup task_setup_data = { |
| .rpc_client = server->client, |
| .rpc_message = &msg, |
| .callback_ops = &nfs4_open_ops, |
| .callback_data = data, |
| .workqueue = nfsiod_workqueue, |
| .flags = RPC_TASK_ASYNC, |
| }; |
| int status; |
| |
| nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1); |
| kref_get(&data->kref); |
| data->rpc_done = false; |
| data->rpc_status = 0; |
| data->cancelled = false; |
| data->is_recover = false; |
| if (isrecover) { |
| nfs4_set_sequence_privileged(&o_arg->seq_args); |
| data->is_recover = true; |
| } |
| task = rpc_run_task(&task_setup_data); |
| if (IS_ERR(task)) |
| return PTR_ERR(task); |
| status = rpc_wait_for_completion_task(task); |
| if (status != 0) { |
| data->cancelled = true; |
| smp_wmb(); |
| } else |
| status = data->rpc_status; |
| rpc_put_task(task); |
| |
| return status; |
| } |
| |
| static int _nfs4_recover_proc_open(struct nfs4_opendata *data) |
| { |
| struct inode *dir = d_inode(data->dir); |
| struct nfs_openres *o_res = &data->o_res; |
| int status; |
| |
| status = nfs4_run_open_task(data, 1); |
| if (status != 0 || !data->rpc_done) |
| return status; |
| |
| nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr); |
| |
| if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) |
| status = _nfs4_proc_open_confirm(data); |
| |
| return status; |
| } |
| |
| /* |
| * Additional permission checks in order to distinguish between an |
| * open for read, and an open for execute. This works around the |
| * fact that NFSv4 OPEN treats read and execute permissions as being |
| * the same. |
| * Note that in the non-execute case, we want to turn off permission |
| * checking if we just created a new file (POSIX open() semantics). |
| */ |
| static int nfs4_opendata_access(struct rpc_cred *cred, |
| struct nfs4_opendata *opendata, |
| struct nfs4_state *state, fmode_t fmode, |
| int openflags) |
| { |
| struct nfs_access_entry cache; |
| u32 mask, flags; |
| |
| /* access call failed or for some reason the server doesn't |
| * support any access modes -- defer access call until later */ |
| if (opendata->o_res.access_supported == 0) |
| return 0; |
| |
| mask = 0; |
| /* |
| * Use openflags to check for exec, because fmode won't |
| * always have FMODE_EXEC set when file open for exec. |
| */ |
| if (openflags & __FMODE_EXEC) { |
| /* ONLY check for exec rights */ |
| if (S_ISDIR(state->inode->i_mode)) |
| mask = NFS4_ACCESS_LOOKUP; |
| else |
| mask = NFS4_ACCESS_EXECUTE; |
| } else if ((fmode & FMODE_READ) && !opendata->file_created) |
| mask = NFS4_ACCESS_READ; |
| |
| cache.cred = cred; |
| nfs_access_set_mask(&cache, opendata->o_res.access_result); |
| nfs_access_add_cache(state->inode, &cache); |
| |
| flags = NFS4_ACCESS_READ | NFS4_ACCESS_EXECUTE | NFS4_ACCESS_LOOKUP; |
| if ((mask & ~cache.mask & flags) == 0) |
| return 0; |
| |
| return -EACCES; |
| } |
| |
| /* |
| * Note: On error, nfs4_proc_open will free the struct nfs4_opendata |
| */ |
| static int _nfs4_proc_open(struct nfs4_opendata *data) |
| { |
| struct inode *dir = d_inode(data->dir); |
| struct nfs_server *server = NFS_SERVER(dir); |
| struct nfs_openargs *o_arg = &data->o_arg; |
| struct nfs_openres *o_res = &data->o_res; |
| int status; |
| |
| status = nfs4_run_open_task(data, 0); |
| if (!data->rpc_done) |
| return status; |
| if (status != 0) { |
| if (status == -NFS4ERR_BADNAME && |
| !(o_arg->open_flags & O_CREAT)) |
| return -ENOENT; |
| return status; |
| } |
| |
| nfs_fattr_map_and_free_names(server, &data->f_attr); |
| |
| if (o_arg->open_flags & O_CREAT) { |
| if (o_arg->open_flags & O_EXCL) |
| data->file_created = true; |
| else if (o_res->cinfo.before != o_res->cinfo.after) |
| data->file_created = true; |
| if (data->file_created || dir->i_version != o_res->cinfo.after) |
| update_changeattr(dir, &o_res->cinfo, |
| o_res->f_attr->time_start); |
| } |
| if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0) |
| server->caps &= ~NFS_CAP_POSIX_LOCK; |
| if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) { |
| status = _nfs4_proc_open_confirm(data); |
| if (status != 0) |
| return status; |
| } |
| if (!(o_res->f_attr->valid & NFS_ATTR_FATTR)) { |
| nfs4_sequence_free_slot(&o_res->seq_res); |
| nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr, o_res->f_label); |
| } |
| return 0; |
| } |
| |
| /* |
| * OPEN_EXPIRED: |
| * reclaim state on the server after a network partition. |
| * Assumes caller holds the appropriate lock |
| */ |
| static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state) |
| { |
| struct nfs4_opendata *opendata; |
| int ret; |
| |
| opendata = nfs4_open_recoverdata_alloc(ctx, state, |
| NFS4_OPEN_CLAIM_FH); |
| if (IS_ERR(opendata)) |
| return PTR_ERR(opendata); |
| ret = nfs4_open_recover(opendata, state); |
| if (ret == -ESTALE) |
| d_drop(ctx->dentry); |
| nfs4_opendata_put(opendata); |
| return ret; |
| } |
| |
| static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state) |
| { |
| struct nfs_server *server = NFS_SERVER(state->inode); |
| struct nfs4_exception exception = { }; |
| int err; |
| |
| do { |
| err = _nfs4_open_expired(ctx, state); |
| trace_nfs4_open_expired(ctx, 0, err); |
| if (nfs4_clear_cap_atomic_open_v1(server, err, &exception)) |
| continue; |
| switch (err) { |
| default: |
| goto out; |
| case -NFS4ERR_GRACE: |
| case -NFS4ERR_DELAY: |
| nfs4_handle_exception(server, err, &exception); |
| err = 0; |
| } |
| } while (exception.retry); |
| out: |
| return err; |
| } |
| |
| static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state) |
| { |
| struct nfs_open_context *ctx; |
| int ret; |
| |
| ctx = nfs4_state_find_open_context(state); |
| if (IS_ERR(ctx)) |
| return -EAGAIN; |
| ret = nfs4_do_open_expired(ctx, state); |
| put_nfs_open_context(ctx); |
| return ret; |
| } |
| |
| static void nfs_finish_clear_delegation_stateid(struct nfs4_state *state, |
| const nfs4_stateid *stateid) |
| { |
| nfs_remove_bad_delegation(state->inode, stateid); |
| write_seqlock(&state->seqlock); |
| nfs4_stateid_copy(&state->stateid, &state->open_stateid); |
| write_sequnlock(&state->seqlock); |
| clear_bit(NFS_DELEGATED_STATE, &state->flags); |
| } |
| |
| static void nfs40_clear_delegation_stateid(struct nfs4_state *state) |
| { |
| if (rcu_access_pointer(NFS_I(state->inode)->delegation) != NULL) |
| nfs_finish_clear_delegation_stateid(state, NULL); |
| } |
| |
| static int nfs40_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state) |
| { |
| /* NFSv4.0 doesn't allow for delegation recovery on open expire */ |
| nfs40_clear_delegation_stateid(state); |
| return nfs4_open_expired(sp, state); |
| } |
| |
| static int nfs40_test_and_free_expired_stateid(struct nfs_server *server, |
| nfs4_stateid *stateid, |
| struct rpc_cred *cred) |
| { |
| return -NFS4ERR_BAD_STATEID; |
| } |
| |
| #if defined(CONFIG_NFS_V4_1) |
| static int nfs41_test_and_free_expired_stateid(struct nfs_server *server, |
| nfs4_stateid *stateid, |
| struct rpc_cred *cred) |
| { |
| int status; |
| |
| switch (stateid->type) { |
| default: |
| break; |
| case NFS4_INVALID_STATEID_TYPE: |
| case NFS4_SPECIAL_STATEID_TYPE: |
| return -NFS4ERR_BAD_STATEID; |
| case NFS4_REVOKED_STATEID_TYPE: |
| goto out_free; |
| } |
| |
| status = nfs41_test_stateid(server, stateid, cred); |
| switch (status) { |
| case -NFS4ERR_EXPIRED: |
| case -NFS4ERR_ADMIN_REVOKED: |
| case -NFS4ERR_DELEG_REVOKED: |
| break; |
| default: |
| return status; |
| } |
| out_free: |
| /* Ack the revoked state to the server */ |
| nfs41_free_stateid(server, stateid, cred, true); |
| return -NFS4ERR_EXPIRED; |
| } |
| |
| static void nfs41_check_delegation_stateid(struct nfs4_state *state) |
| { |
| struct nfs_server *server = NFS_SERVER(state->inode); |
| nfs4_stateid stateid; |
| struct nfs_delegation *delegation; |
| struct rpc_cred *cred; |
| int status; |
| |
| /* Get the delegation credential for use by test/free_stateid */ |
| rcu_read_lock(); |
| delegation = rcu_dereference(NFS_I(state->inode)->delegation); |
| if (delegation == NULL) { |
| rcu_read_unlock(); |
| return; |
| } |
| |
| nfs4_stateid_copy(&stateid, &delegation->stateid); |
| if (test_bit(NFS_DELEGATION_REVOKED, &delegation->flags) || |
| !test_and_clear_bit(NFS_DELEGATION_TEST_EXPIRED, |
| &delegation->flags)) { |
| rcu_read_unlock(); |
| nfs_finish_clear_delegation_stateid(state, &stateid); |
| return; |
| } |
| |
| cred = get_rpccred(delegation->cred); |
| rcu_read_unlock(); |
| status = nfs41_test_and_free_expired_stateid(server, &stateid, cred); |
| trace_nfs4_test_delegation_stateid(state, NULL, status); |
| if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID) |
| nfs_finish_clear_delegation_stateid(state, &stateid); |
| |
| put_rpccred(cred); |
| } |
| |
| /** |
| * nfs41_check_expired_locks - possibly free a lock stateid |
| * |
| * @state: NFSv4 state for an inode |
| * |
| * Returns NFS_OK if recovery for this stateid is now finished. |
| * Otherwise a negative NFS4ERR value is returned. |
| */ |
| static int nfs41_check_expired_locks(struct nfs4_state *state) |
| { |
| int status, ret = NFS_OK; |
| struct nfs4_lock_state *lsp, *prev = NULL; |
| struct nfs_server *server = NFS_SERVER(state->inode); |
| |
| if (!test_bit(LK_STATE_IN_USE, &state->flags)) |
| goto out; |
| |
| spin_lock(&state->state_lock); |
| list_for_each_entry(lsp, &state->lock_states, ls_locks) { |
| if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) { |
| struct rpc_cred *cred = lsp->ls_state->owner->so_cred; |
| |
| atomic_inc(&lsp->ls_count); |
| spin_unlock(&state->state_lock); |
| |
| nfs4_put_lock_state(prev); |
| prev = lsp; |
| |
| status = nfs41_test_and_free_expired_stateid(server, |
| &lsp->ls_stateid, |
| cred); |
| trace_nfs4_test_lock_stateid(state, lsp, status); |
| if (status == -NFS4ERR_EXPIRED || |
| status == -NFS4ERR_BAD_STATEID) { |
| clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags); |
| lsp->ls_stateid.type = NFS4_INVALID_STATEID_TYPE; |
| if (!recover_lost_locks) |
| set_bit(NFS_LOCK_LOST, &lsp->ls_flags); |
| } else if (status != NFS_OK) { |
| ret = status; |
| nfs4_put_lock_state(prev); |
| goto out; |
| } |
| spin_lock(&state->state_lock); |
| } |
| } |
| spin_unlock(&state->state_lock); |
| nfs4_put_lock_state(prev); |
| out: |
| return ret; |
| } |
| |
| /** |
| * nfs41_check_open_stateid - possibly free an open stateid |
| * |
| * @state: NFSv4 state for an inode |
| * |
| * Returns NFS_OK if recovery for this stateid is now finished. |
| * Otherwise a negative NFS4ERR value is returned. |
| */ |
| static int nfs41_check_open_stateid(struct nfs4_state *state) |
| { |
| struct nfs_server *server = NFS_SERVER(state->inode); |
| nfs4_stateid *stateid = &state->open_stateid; |
| struct rpc_cred *cred = state->owner->so_cred; |
| int status; |
| |
| if (test_bit(NFS_OPEN_STATE, &state->flags) == 0) { |
| if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0) { |
| if (nfs4_have_delegation(state->inode, state->state)) |
| return NFS_OK; |
| return -NFS4ERR_OPENMODE; |
| } |
| return -NFS4ERR_BAD_STATEID; |
| } |
| status = nfs41_test_and_free_expired_stateid(server, stateid, cred); |
| trace_nfs4_test_open_stateid(state, NULL, status); |
| if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID) { |
| clear_bit(NFS_O_RDONLY_STATE, &state->flags); |
| clear_bit(NFS_O_WRONLY_STATE, &state->flags); |
| clear_bit(NFS_O_RDWR_STATE, &state->flags); |
| clear_bit(NFS_OPEN_STATE, &state->flags); |
| stateid->type = NFS4_INVALID_STATEID_TYPE; |
| return status; |
| } |
| if (nfs_open_stateid_recover_openmode(state)) |
| return -NFS4ERR_OPENMODE; |
| return NFS_OK; |
| } |
| |
| static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state) |
| { |
| int status; |
| |
| nfs41_check_delegation_stateid(state); |
| status = nfs41_check_expired_locks(state); |
| if (status != NFS_OK) |
| return status; |
| status = nfs41_check_open_stateid(state); |
| if (status != NFS_OK) |
| status = nfs4_open_expired(sp, state); |
| return status; |
| } |
| #endif |
| |
| /* |
| * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-* |
| * fields corresponding to attributes that were used to store the verifier. |
| * Make sure we clobber those fields in the later setattr call |
| */ |
| static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, |
| struct iattr *sattr, struct nfs4_label **label) |
| { |
| const u32 *attrset = opendata->o_res.attrset; |
| |
| if ((attrset[1] & FATTR4_WORD1_TIME_ACCESS) && |
| !(sattr->ia_valid & ATTR_ATIME_SET)) |
| sattr->ia_valid |= ATTR_ATIME; |
| |
| if ((attrset[1] & FATTR4_WORD1_TIME_MODIFY) && |
| !(sattr->ia_valid & ATTR_MTIME_SET)) |
| sattr->ia_valid |= ATTR_MTIME; |
| |
| /* Except MODE, it seems harmless of setting twice. */ |
| if (opendata->o_arg.createmode != NFS4_CREATE_EXCLUSIVE && |
| (attrset[1] & FATTR4_WORD1_MODE || |
| attrset[2] & FATTR4_WORD2_MODE_UMASK)) |
| sattr->ia_valid &= ~ATTR_MODE; |
| |
| if (attrset[2] & FATTR4_WORD2_SECURITY_LABEL) |
| *label = NULL; |
| } |
| |
| static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata, |
| fmode_t fmode, |
| int flags, |
| struct nfs_open_context *ctx) |
| { |
| struct nfs4_state_owner *sp = opendata->owner; |
| struct nfs_server *server = sp->so_server; |
| struct dentry *dentry; |
| struct nfs4_state *state; |
| unsigned int seq; |
| int ret; |
| |
| seq = raw_seqcount_begin(&sp->so_reclaim_seqcount); |
| |
| ret = _nfs4_proc_open(opendata); |
| if (ret != 0) |
| goto out; |
| |
| state = nfs4_opendata_to_nfs4_state(opendata); |
| ret = PTR_ERR(state); |
| if (IS_ERR(state)) |
| goto out; |
| ctx->state = state; |
| if (server->caps & NFS_CAP_POSIX_LOCK) |
| set_bit(NFS_STATE_POSIX_LOCKS, &state->flags); |
| if (opendata->o_res.rflags & NFS4_OPEN_RESULT_MAY_NOTIFY_LOCK) |
| set_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags); |
| |
| dentry = opendata->dentry; |
| if (d_really_is_negative(dentry)) { |
| struct dentry *alias; |
| d_drop(dentry); |
| alias = d_exact_alias(dentry, state->inode); |
| if (!alias) |
| alias = d_splice_alias(igrab(state->inode), dentry); |
| /* d_splice_alias() can't fail here - it's a non-directory */ |
| if (alias) { |
| dput(ctx->dentry); |
| ctx->dentry = dentry = alias; |
| } |
| nfs_set_verifier(dentry, |
| nfs_save_change_attribute(d_inode(opendata->dir))); |
| } |
| |
| ret = nfs4_opendata_access(sp->so_cred, opendata, state, fmode, flags); |
| if (ret != 0) |
| goto out; |
| |
| if (d_inode(dentry) == state->inode) { |
| nfs_inode_attach_open_context(ctx); |
| if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) |
| nfs4_schedule_stateid_recovery(server, state); |
| } |
| out: |
| return ret; |
| } |
| |
| /* |
| * Returns a referenced nfs4_state |
| */ |
| static int _nfs4_do_open(struct inode *dir, |
| struct nfs_open_context *ctx, |
| int flags, |
| struct iattr *sattr, |
| struct nfs4_label *label, |
| int *opened) |
| { |
| struct nfs4_state_owner *sp; |
| struct nfs4_state *state = NULL; |
| struct nfs_server *server = NFS_SERVER(dir); |
| struct nfs4_opendata *opendata; |
| struct dentry *dentry = ctx->dentry; |
| struct rpc_cred *cred = ctx->cred; |
| struct nfs4_threshold **ctx_th = &ctx->mdsthreshold; |
| fmode_t fmode = ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC); |
| enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL; |
| struct nfs4_label *olabel = NULL; |
| int status; |
| |
| /* Protect against reboot recovery conflicts */ |
| status = -ENOMEM; |
| sp = nfs4_get_state_owner(server, cred, GFP_KERNEL); |
| if (sp == NULL) { |
| dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n"); |
| goto out_err; |
| } |
| status = nfs4_client_recover_expired_lease(server->nfs_client); |
| if (status != 0) |
| goto err_put_state_owner; |
| if (d_really_is_positive(dentry)) |
| nfs4_return_incompatible_delegation(d_inode(dentry), fmode); |
| status = -ENOMEM; |
| if (d_really_is_positive(dentry)) |
| claim = NFS4_OPEN_CLAIM_FH; |
| opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr, |
| label, claim, GFP_KERNEL); |
| if (opendata == NULL) |
| goto err_put_state_owner; |
| |
| if (label) { |
| olabel = nfs4_label_alloc(server, GFP_KERNEL); |
| if (IS_ERR(olabel)) { |
| status = PTR_ERR(olabel); |
| goto err_opendata_put; |
| } |
| } |
| |
| if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) { |
| if (!opendata->f_attr.mdsthreshold) { |
| opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc(); |
| if (!opendata->f_attr.mdsthreshold) |
| goto err_free_label; |
| } |
| opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0]; |
| } |
| if (d_really_is_positive(dentry)) |
| opendata->state = nfs4_get_open_state(d_inode(dentry), sp); |
| |
| status = _nfs4_open_and_get_state(opendata, fmode, flags, ctx); |
| if (status != 0) |
| goto err_free_label; |
| state = ctx->state; |
| |
| if ((opendata->o_arg.open_flags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL) && |
| (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) { |
| nfs4_exclusive_attrset(opendata, sattr, &label); |
| /* |
| * send create attributes which was not set by open |
| * with an extra setattr. |
| */ |
| if (sattr->ia_valid & NFS4_VALID_ATTRS) { |
| nfs_fattr_init(opendata->o_res.f_attr); |
| status = nfs4_do_setattr(state->inode, cred, |
| opendata->o_res.f_attr, sattr, |
| ctx, label, olabel); |
| if (status == 0) { |
| nfs_setattr_update_inode(state->inode, sattr, |
| opendata->o_res.f_attr); |
| nfs_setsecurity(state->inode, opendata->o_res.f_attr, olabel); |
| } |
| } |
| } |
| if (opened && opendata->file_created) |
| *opened |= FILE_CREATED; |
| |
| if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) { |
| *ctx_th = opendata->f_attr.mdsthreshold; |
| opendata->f_attr.mdsthreshold = NULL; |
| } |
| |
| nfs4_label_free(olabel); |
| |
| nfs4_opendata_put(opendata); |
| nfs4_put_state_owner(sp); |
| return 0; |
| err_free_label: |
| nfs4_label_free(olabel); |
| err_opendata_put: |
| nfs4_opendata_put(opendata); |
| err_put_state_owner: |
| nfs4_put_state_owner(sp); |
| out_err: |
| return status; |
| } |
| |
| |
| static struct nfs4_state *nfs4_do_open(struct inode *dir, |
| struct nfs_open_context *ctx, |
| int flags, |
| struct iattr *sattr, |
| struct nfs4_label *label, |
| int *opened) |
| { |
| struct nfs_server *server = NFS_SERVER(dir); |
| struct nfs4_exception exception = { }; |
| struct nfs4_state *res; |
| int status; |
| |
| do { |
| status = _nfs4_do_open(dir, ctx, flags, sattr, label, opened); |
| res = ctx->state; |
| trace_nfs4_open_file(ctx, flags, status); |
| if (status == 0) |
| break; |
| /* NOTE: BAD_SEQID means the server and client disagree about the |
| * book-keeping w.r.t. state-changing operations |
| * (OPEN/CLOSE/LOCK/LOCKU...) |
| * It is actually a sign of a bug on the client or on the server. |
| * |
| * If we receive a BAD_SEQID error in the particular case of |
| * doing an OPEN, we assume that nfs_increment_open_seqid() will |
| * have unhashed the old state_owner for us, and that we can |
| * therefore safely retry using a new one. We should still warn |
| * the user though... |
| */ |
| if (status == -NFS4ERR_BAD_SEQID) { |
| pr_warn_ratelimited("NFS: v4 server %s " |
| " returned a bad sequence-id error!\n", |
| NFS_SERVER(dir)->nfs_client->cl_hostname); |
| exception.retry = 1; |
| continue; |
| } |
| /* |
| * BAD_STATEID on OPEN means that the server cancelled our |
| * state before it received the OPEN_CONFIRM. |
| * Recover by retrying the request as per the discussion |
| * on Page 181 of RFC3530. |
| */ |
| if (status == -NFS4ERR_BAD_STATEID) { |
| exception.retry = 1; |
| continue; |
| } |
| if (status == -EAGAIN) { |
| /* We must have found a delegation */ |
| exception.retry = 1; |
| continue; |
| } |
| if (nfs4_clear_cap_atomic_open_v1(server, status, &exception)) |
| continue; |
| res = ERR_PTR(nfs4_handle_exception(server, |
| status, &exception)); |
| } while (exception.retry); |
| return res; |
| } |
| |
| static int _nfs4_do_setattr(struct inode *inode, |
| struct nfs_setattrargs *arg, |
| struct nfs_setattrres *res, |
| struct rpc_cred *cred, |
| struct nfs_open_context *ctx) |
| { |
| struct nfs_server *server = NFS_SERVER(inode); |
| struct rpc_message msg = { |
| .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR], |
| .rpc_argp = arg, |
| .rpc_resp = res, |
| .rpc_cred = cred, |
| }; |
| struct rpc_cred *delegation_cred = NULL; |
| unsigned long timestamp = jiffies; |
| fmode_t fmode; |
| bool truncate; |
| int status; |
| |
| nfs_fattr_init(res->fattr); |
| |
| /* Servers should only apply open mode checks for file size changes */ |
| truncate = (arg->iap->ia_valid & ATTR_SIZE) ? true : false; |
| fmode = truncate ? FMODE_WRITE : FMODE_READ; |
| |
| if (nfs4_copy_delegation_stateid(inode, fmode, &arg->stateid, &delegation_cred)) { |
| /* Use that stateid */ |
| } else if (truncate && ctx != NULL) { |
| struct nfs_lock_context *l_ctx; |
| if (!nfs4_valid_open_stateid(ctx->state)) |
| return -EBADF; |
| l_ctx = nfs_get_lock_context(ctx); |
| if (IS_ERR(l_ctx)) |
| return PTR_ERR(l_ctx); |
| status = nfs4_select_rw_stateid(ctx->state, FMODE_WRITE, l_ctx, |
| &arg->stateid, &delegation_cred); |
| nfs_put_lock_context(l_ctx); |
| if (status == -EIO) |
| return -EBADF; |
| } else |
| nfs4_stateid_copy(&arg->stateid, &zero_stateid); |
| if (delegation_cred) |
| msg.rpc_cred = delegation_cred; |
| |
| status = nfs4_call_sync(server->client, server, &msg, &arg->seq_args, &res->seq_res, 1); |
| |
| put_rpccred(delegation_cred); |
| if (status == 0 && ctx != NULL) |
| renew_lease(server, timestamp); |
| trace_nfs4_setattr(inode, &arg->stateid, status); |
| return status; |
| } |
| |
| static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred, |
| struct nfs_fattr *fattr, struct iattr *sattr, |
| struct nfs_open_context *ctx, struct nfs4_label *ilabel, |
| struct nfs4_label *olabel) |
| { |
| struct nfs_server *server = NFS_SERVER(inode); |
| struct nfs4_state *state = ctx ? ctx->state : NULL; |
| struct nfs_setattrargs arg = { |
| .fh = NFS_FH(inode), |
| .iap = sattr, |
| .server = server, |
| .bitmask = server->attr_bitmask, |
| .label = ilabel, |
| }; |
| struct nfs_setattrres res = { |
| .fattr = fattr, |
| .label = olabel, |
| .server = server, |
| }; |
| struct nfs4_exception exception = { |
| .state = state, |
| .inode = inode, |
| .stateid = &arg.stateid, |
| }; |
| int err; |
| |
| arg.bitmask = nfs4_bitmask(server, ilabel); |
| if (ilabel) |
| arg.bitmask = nfs4_bitmask(server, olabel); |
| |
| do { |
| err = _nfs4_do_setattr(inode, &arg, &res, cred, ctx); |
| switch (err) { |
| case -NFS4ERR_OPENMODE: |
| if (!(sattr->ia_valid & ATTR_SIZE)) { |
| pr_warn_once("NFSv4: server %s is incorrectly " |
| "applying open mode checks to " |
| "a SETATTR that is not " |
| "changing file size.\n", |
| server->nfs_client->cl_hostname); |
| } |
| if (state && !(state->state & FMODE_WRITE)) { |
| err = -EBADF; |
| if (sattr->ia_valid & ATTR_OPEN) |
| err = -EACCES; |
| goto out; |
| } |
| } |
| err = nfs4_handle_exception(server, err, &exception); |
| } while (exception.retry); |
| out: |
| return err; |
|