| /* |
| * 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/utsname.h> |
| #include <linux/delay.h> |
| #include <linux/errno.h> |
| #include <linux/string.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/smp_lock.h> |
| #include <linux/namei.h> |
| #include <linux/mount.h> |
| |
| #include "nfs4_fs.h" |
| #include "delegation.h" |
| #include "iostat.h" |
| |
| #define NFSDBG_FACILITY NFSDBG_PROC |
| |
| #define NFS4_POLL_RETRY_MIN (HZ/10) |
| #define NFS4_POLL_RETRY_MAX (15*HZ) |
| |
| struct nfs4_opendata; |
| static int _nfs4_proc_open(struct nfs4_opendata *data); |
| static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *); |
| static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *); |
| static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry); |
| static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception); |
| static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp); |
| |
| /* Prevent leaks of NFSv4 errors into userland */ |
| int nfs4_map_errors(int err) |
| { |
| if (err < -1000) { |
| dprintk("%s could not handle NFSv4 error %d\n", |
| __FUNCTION__, -err); |
| return -EIO; |
| } |
| return err; |
| } |
| |
| /* |
| * This is our standard bitmap for GETATTR requests. |
| */ |
| const u32 nfs4_fattr_bitmap[2] = { |
| 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 |
| }; |
| |
| const u32 nfs4_statfs_bitmap[2] = { |
| 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[2] = { |
| FATTR4_WORD0_MAXLINK |
| | FATTR4_WORD0_MAXNAME, |
| 0 |
| }; |
| |
| const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE |
| | FATTR4_WORD0_MAXREAD |
| | FATTR4_WORD0_MAXWRITE |
| | FATTR4_WORD0_LEASE_TIME, |
| 0 |
| }; |
| |
| const u32 nfs4_fs_locations_bitmap[2] = { |
| 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) |
| { |
| __be32 *start, *p; |
| |
| BUG_ON(readdir->count < 80); |
| 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, KM_USER0); |
| |
| 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(FATTR4_WORD0_FILEID); /* bitmap */ |
| *p++ = htonl(8); /* attribute buffer length */ |
| p = xdr_encode_hyper(p, dentry->d_inode->i_ino); |
| } |
| |
| *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(FATTR4_WORD0_FILEID); /* bitmap */ |
| *p++ = htonl(8); /* attribute buffer length */ |
| p = xdr_encode_hyper(p, dentry->d_parent->d_inode->i_ino); |
| |
| readdir->pgbase = (char *)p - (char *)start; |
| readdir->count -= readdir->pgbase; |
| kunmap_atomic(start, KM_USER0); |
| } |
| |
| static void renew_lease(const struct nfs_server *server, unsigned long timestamp) |
| { |
| struct nfs_client *clp = server->nfs_client; |
| 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 update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo) |
| { |
| struct nfs_inode *nfsi = NFS_I(dir); |
| |
| spin_lock(&dir->i_lock); |
| nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA; |
| if (cinfo->before == nfsi->change_attr && cinfo->atomic) |
| nfsi->change_attr = cinfo->after; |
| spin_unlock(&dir->i_lock); |
| } |
| |
| struct nfs4_opendata { |
| atomic_t count; |
| struct nfs_openargs o_arg; |
| struct nfs_openres o_res; |
| struct nfs_open_confirmargs c_arg; |
| struct nfs_open_confirmres c_res; |
| struct nfs_fattr f_attr; |
| struct nfs_fattr dir_attr; |
| struct dentry *dentry; |
| struct dentry *dir; |
| struct nfs4_state_owner *owner; |
| struct iattr attrs; |
| unsigned long timestamp; |
| int rpc_status; |
| int cancelled; |
| }; |
| |
| static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry, |
| struct nfs4_state_owner *sp, int flags, |
| const struct iattr *attrs) |
| { |
| struct dentry *parent = dget_parent(dentry); |
| struct inode *dir = parent->d_inode; |
| struct nfs_server *server = NFS_SERVER(dir); |
| struct nfs4_opendata *p; |
| |
| p = kzalloc(sizeof(*p), GFP_KERNEL); |
| if (p == NULL) |
| goto err; |
| p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid); |
| if (p->o_arg.seqid == NULL) |
| goto err_free; |
| atomic_set(&p->count, 1); |
| p->dentry = dget(dentry); |
| p->dir = parent; |
| p->owner = sp; |
| atomic_inc(&sp->so_count); |
| p->o_arg.fh = NFS_FH(dir); |
| p->o_arg.open_flags = flags, |
| p->o_arg.clientid = server->nfs_client->cl_clientid; |
| p->o_arg.id = sp->so_id; |
| p->o_arg.name = &dentry->d_name; |
| p->o_arg.server = server; |
| p->o_arg.bitmask = server->attr_bitmask; |
| p->o_arg.claim = NFS4_OPEN_CLAIM_NULL; |
| p->o_res.f_attr = &p->f_attr; |
| p->o_res.dir_attr = &p->dir_attr; |
| p->o_res.server = server; |
| nfs_fattr_init(&p->f_attr); |
| nfs_fattr_init(&p->dir_attr); |
| if (flags & O_EXCL) { |
| u32 *s = (u32 *) p->o_arg.u.verifier.data; |
| s[0] = jiffies; |
| s[1] = current->pid; |
| } else if (flags & O_CREAT) { |
| p->o_arg.u.attrs = &p->attrs; |
| memcpy(&p->attrs, attrs, sizeof(p->attrs)); |
| } |
| p->c_arg.fh = &p->o_res.fh; |
| p->c_arg.stateid = &p->o_res.stateid; |
| p->c_arg.seqid = p->o_arg.seqid; |
| return p; |
| err_free: |
| kfree(p); |
| err: |
| dput(parent); |
| return NULL; |
| } |
| |
| static void nfs4_opendata_free(struct nfs4_opendata *p) |
| { |
| if (p != NULL && atomic_dec_and_test(&p->count)) { |
| nfs_free_seqid(p->o_arg.seqid); |
| nfs4_put_state_owner(p->owner); |
| dput(p->dir); |
| dput(p->dentry); |
| kfree(p); |
| } |
| } |
| |
| /* Helper for asynchronous RPC calls */ |
| static int nfs4_call_async(struct rpc_clnt *clnt, |
| const struct rpc_call_ops *tk_ops, void *calldata) |
| { |
| struct rpc_task *task; |
| |
| if (!(task = rpc_new_task(clnt, RPC_TASK_ASYNC, tk_ops, calldata))) |
| return -ENOMEM; |
| rpc_execute(task); |
| return 0; |
| } |
| |
| static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task) |
| { |
| sigset_t oldset; |
| int ret; |
| |
| rpc_clnt_sigmask(task->tk_client, &oldset); |
| ret = rpc_wait_for_completion_task(task); |
| rpc_clnt_sigunmask(task->tk_client, &oldset); |
| return ret; |
| } |
| |
| static inline void update_open_stateflags(struct nfs4_state *state, mode_t open_flags) |
| { |
| switch (open_flags) { |
| case FMODE_WRITE: |
| state->n_wronly++; |
| break; |
| case FMODE_READ: |
| state->n_rdonly++; |
| break; |
| case FMODE_READ|FMODE_WRITE: |
| state->n_rdwr++; |
| } |
| } |
| |
| static void update_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags) |
| { |
| struct inode *inode = state->inode; |
| |
| open_flags &= (FMODE_READ|FMODE_WRITE); |
| /* Protect against nfs4_find_state_byowner() */ |
| spin_lock(&state->owner->so_lock); |
| spin_lock(&inode->i_lock); |
| memcpy(&state->stateid, stateid, sizeof(state->stateid)); |
| update_open_stateflags(state, open_flags); |
| nfs4_state_set_mode_locked(state, state->state | open_flags); |
| spin_unlock(&inode->i_lock); |
| spin_unlock(&state->owner->so_lock); |
| } |
| |
| static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data) |
| { |
| struct inode *inode; |
| struct nfs4_state *state = NULL; |
| |
| if (!(data->f_attr.valid & NFS_ATTR_FATTR)) |
| goto out; |
| inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr); |
| if (IS_ERR(inode)) |
| goto out; |
| state = nfs4_get_open_state(inode, data->owner); |
| if (state == NULL) |
| goto put_inode; |
| update_open_stateid(state, &data->o_res.stateid, data->o_arg.open_flags); |
| put_inode: |
| iput(inode); |
| out: |
| return state; |
| } |
| |
| 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 int nfs4_open_recover_helper(struct nfs4_opendata *opendata, mode_t openflags, nfs4_stateid *stateid) |
| { |
| int ret; |
| |
| opendata->o_arg.open_flags = openflags; |
| ret = _nfs4_proc_open(opendata); |
| if (ret != 0) |
| return ret; |
| memcpy(stateid->data, opendata->o_res.stateid.data, |
| sizeof(stateid->data)); |
| return 0; |
| } |
| |
| static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state) |
| { |
| nfs4_stateid stateid; |
| struct nfs4_state *newstate; |
| int mode = 0; |
| int delegation = 0; |
| int ret; |
| |
| /* memory barrier prior to reading state->n_* */ |
| smp_rmb(); |
| if (state->n_rdwr != 0) { |
| ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &stateid); |
| if (ret != 0) |
| return ret; |
| mode |= FMODE_READ|FMODE_WRITE; |
| if (opendata->o_res.delegation_type != 0) |
| delegation = opendata->o_res.delegation_type; |
| smp_rmb(); |
| } |
| if (state->n_wronly != 0) { |
| ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &stateid); |
| if (ret != 0) |
| return ret; |
| mode |= FMODE_WRITE; |
| if (opendata->o_res.delegation_type != 0) |
| delegation = opendata->o_res.delegation_type; |
| smp_rmb(); |
| } |
| if (state->n_rdonly != 0) { |
| ret = nfs4_open_recover_helper(opendata, FMODE_READ, &stateid); |
| if (ret != 0) |
| return ret; |
| mode |= FMODE_READ; |
| } |
| clear_bit(NFS_DELEGATED_STATE, &state->flags); |
| if (mode == 0) |
| return 0; |
| if (opendata->o_res.delegation_type == 0) |
| opendata->o_res.delegation_type = delegation; |
| opendata->o_arg.open_flags |= mode; |
| newstate = nfs4_opendata_to_nfs4_state(opendata); |
| if (newstate != NULL) { |
| if (opendata->o_res.delegation_type != 0) { |
| struct nfs_inode *nfsi = NFS_I(newstate->inode); |
| int delegation_flags = 0; |
| if (nfsi->delegation) |
| delegation_flags = nfsi->delegation->flags; |
| if (!(delegation_flags & NFS_DELEGATION_NEED_RECLAIM)) |
| nfs_inode_set_delegation(newstate->inode, |
| opendata->owner->so_cred, |
| &opendata->o_res); |
| else |
| nfs_inode_reclaim_delegation(newstate->inode, |
| opendata->owner->so_cred, |
| &opendata->o_res); |
| } |
| nfs4_close_state(newstate, opendata->o_arg.open_flags); |
| } |
| if (newstate != state) |
| return -ESTALE; |
| return 0; |
| } |
| |
| /* |
| * OPEN_RECLAIM: |
| * reclaim state on the server after a reboot. |
| */ |
| static int _nfs4_do_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry) |
| { |
| struct nfs_delegation *delegation = NFS_I(state->inode)->delegation; |
| struct nfs4_opendata *opendata; |
| int delegation_type = 0; |
| int status; |
| |
| if (delegation != NULL) { |
| if (!(delegation->flags & NFS_DELEGATION_NEED_RECLAIM)) { |
| memcpy(&state->stateid, &delegation->stateid, |
| sizeof(state->stateid)); |
| set_bit(NFS_DELEGATED_STATE, &state->flags); |
| return 0; |
| } |
| delegation_type = delegation->type; |
| } |
| opendata = nfs4_opendata_alloc(dentry, sp, 0, NULL); |
| if (opendata == NULL) |
| return -ENOMEM; |
| opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS; |
| opendata->o_arg.fh = NFS_FH(state->inode); |
| nfs_copy_fh(&opendata->o_res.fh, opendata->o_arg.fh); |
| opendata->o_arg.u.delegation_type = delegation_type; |
| status = nfs4_open_recover(opendata, state); |
| nfs4_opendata_free(opendata); |
| return status; |
| } |
| |
| static int nfs4_do_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry) |
| { |
| struct nfs_server *server = NFS_SERVER(state->inode); |
| struct nfs4_exception exception = { }; |
| int err; |
| do { |
| err = _nfs4_do_open_reclaim(sp, state, dentry); |
| 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 PTR_ERR(ctx); |
| ret = nfs4_do_open_reclaim(sp, state, ctx->dentry); |
| put_nfs_open_context(ctx); |
| return ret; |
| } |
| |
| static int _nfs4_open_delegation_recall(struct dentry *dentry, struct nfs4_state *state) |
| { |
| struct nfs4_state_owner *sp = state->owner; |
| struct nfs4_opendata *opendata; |
| int ret; |
| |
| if (!test_bit(NFS_DELEGATED_STATE, &state->flags)) |
| return 0; |
| opendata = nfs4_opendata_alloc(dentry, sp, 0, NULL); |
| if (opendata == NULL) |
| return -ENOMEM; |
| opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR; |
| memcpy(opendata->o_arg.u.delegation.data, state->stateid.data, |
| sizeof(opendata->o_arg.u.delegation.data)); |
| ret = nfs4_open_recover(opendata, state); |
| nfs4_opendata_free(opendata); |
| return ret; |
| } |
| |
| int nfs4_open_delegation_recall(struct dentry *dentry, struct nfs4_state *state) |
| { |
| struct nfs4_exception exception = { }; |
| struct nfs_server *server = NFS_SERVER(dentry->d_inode); |
| int err; |
| do { |
| err = _nfs4_open_delegation_recall(dentry, state); |
| switch (err) { |
| case 0: |
| return err; |
| case -NFS4ERR_STALE_CLIENTID: |
| case -NFS4ERR_STALE_STATEID: |
| case -NFS4ERR_EXPIRED: |
| /* Don't recall a delegation if it was lost */ |
| nfs4_schedule_state_recovery(server->nfs_client); |
| return err; |
| } |
| err = nfs4_handle_exception(server, err, &exception); |
| } while (exception.retry); |
| return err; |
| } |
| |
| static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata) |
| { |
| struct nfs4_opendata *data = calldata; |
| 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, |
| }; |
| data->timestamp = jiffies; |
| rpc_call_setup(task, &msg, 0); |
| } |
| |
| static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata) |
| { |
| struct nfs4_opendata *data = calldata; |
| |
| data->rpc_status = task->tk_status; |
| if (RPC_ASSASSINATED(task)) |
| return; |
| if (data->rpc_status == 0) { |
| memcpy(data->o_res.stateid.data, data->c_res.stateid.data, |
| sizeof(data->o_res.stateid.data)); |
| renew_lease(data->o_res.server, data->timestamp); |
| } |
| nfs_increment_open_seqid(data->rpc_status, data->c_arg.seqid); |
| nfs_confirm_seqid(&data->owner->so_seqid, data->rpc_status); |
| } |
| |
| 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 == 0) |
| goto out_free; |
| /* In case of error, no cleanup! */ |
| if (data->rpc_status != 0) |
| goto out_free; |
| nfs_confirm_seqid(&data->owner->so_seqid, 0); |
| state = nfs4_opendata_to_nfs4_state(data); |
| if (state != NULL) |
| nfs4_close_state(state, data->o_arg.open_flags); |
| out_free: |
| nfs4_opendata_free(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(data->dir->d_inode); |
| struct rpc_task *task; |
| int status; |
| |
| atomic_inc(&data->count); |
| /* |
| * If rpc_run_task() ends up calling ->rpc_release(), we |
| * want to ensure that it takes the 'error' code path. |
| */ |
| data->rpc_status = -ENOMEM; |
| task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_open_confirm_ops, data); |
| if (IS_ERR(task)) |
| return PTR_ERR(task); |
| status = nfs4_wait_for_completion_rpc_task(task); |
| if (status != 0) { |
| data->cancelled = 1; |
| 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 rpc_message msg = { |
| .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN], |
| .rpc_argp = &data->o_arg, |
| .rpc_resp = &data->o_res, |
| .rpc_cred = sp->so_cred, |
| }; |
| |
| if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0) |
| return; |
| /* Update sequence id. */ |
| data->o_arg.id = sp->so_id; |
| data->o_arg.clientid = sp->so_client->cl_clientid; |
| if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) |
| msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR]; |
| data->timestamp = jiffies; |
| rpc_call_setup(task, &msg, 0); |
| } |
| |
| static void nfs4_open_done(struct rpc_task *task, void *calldata) |
| { |
| struct nfs4_opendata *data = calldata; |
| |
| data->rpc_status = task->tk_status; |
| if (RPC_ASSASSINATED(task)) |
| return; |
| if (task->tk_status == 0) { |
| 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); |
| } |
| nfs_increment_open_seqid(data->rpc_status, data->o_arg.seqid); |
| } |
| |
| 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 == 0) |
| goto out_free; |
| /* In case of error, no cleanup! */ |
| if (data->rpc_status != 0) |
| goto out_free; |
| /* In case we need an open_confirm, no cleanup! */ |
| if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM) |
| goto out_free; |
| nfs_confirm_seqid(&data->owner->so_seqid, 0); |
| state = nfs4_opendata_to_nfs4_state(data); |
| if (state != NULL) |
| nfs4_close_state(state, data->o_arg.open_flags); |
| out_free: |
| nfs4_opendata_free(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, |
| }; |
| |
| /* |
| * Note: On error, nfs4_proc_open will free the struct nfs4_opendata |
| */ |
| static int _nfs4_proc_open(struct nfs4_opendata *data) |
| { |
| struct inode *dir = data->dir->d_inode; |
| 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; |
| int status; |
| |
| atomic_inc(&data->count); |
| /* |
| * If rpc_run_task() ends up calling ->rpc_release(), we |
| * want to ensure that it takes the 'error' code path. |
| */ |
| data->rpc_status = -ENOMEM; |
| task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_open_ops, data); |
| if (IS_ERR(task)) |
| return PTR_ERR(task); |
| status = nfs4_wait_for_completion_rpc_task(task); |
| if (status != 0) { |
| data->cancelled = 1; |
| smp_wmb(); |
| } else |
| status = data->rpc_status; |
| rpc_put_task(task); |
| if (status != 0) |
| return status; |
| |
| if (o_arg->open_flags & O_CREAT) { |
| update_changeattr(dir, &o_res->cinfo); |
| nfs_post_op_update_inode(dir, o_res->dir_attr); |
| } else |
| nfs_refresh_inode(dir, o_res->dir_attr); |
| if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) { |
| status = _nfs4_proc_open_confirm(data); |
| if (status != 0) |
| return status; |
| } |
| nfs_confirm_seqid(&data->owner->so_seqid, 0); |
| if (!(o_res->f_attr->valid & NFS_ATTR_FATTR)) |
| return server->nfs_client->rpc_ops->getattr(server, &o_res->fh, o_res->f_attr); |
| return 0; |
| } |
| |
| static int _nfs4_do_access(struct inode *inode, struct rpc_cred *cred, int openflags) |
| { |
| struct nfs_access_entry cache; |
| int mask = 0; |
| int status; |
| |
| if (openflags & FMODE_READ) |
| mask |= MAY_READ; |
| if (openflags & FMODE_WRITE) |
| mask |= MAY_WRITE; |
| status = nfs_access_get_cached(inode, cred, &cache); |
| if (status == 0) |
| goto out; |
| |
| /* Be clever: ask server to check for all possible rights */ |
| cache.mask = MAY_EXEC | MAY_WRITE | MAY_READ; |
| cache.cred = cred; |
| cache.jiffies = jiffies; |
| status = _nfs4_proc_access(inode, &cache); |
| if (status != 0) |
| return status; |
| nfs_access_add_cache(inode, &cache); |
| out: |
| if ((cache.mask & mask) == mask) |
| return 0; |
| return -EACCES; |
| } |
| |
| int nfs4_recover_expired_lease(struct nfs_server *server) |
| { |
| struct nfs_client *clp = server->nfs_client; |
| int ret; |
| |
| for (;;) { |
| ret = nfs4_wait_clnt_recover(server->client, clp); |
| if (ret != 0) |
| return ret; |
| if (!test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) |
| break; |
| nfs4_schedule_state_recovery(clp); |
| } |
| 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 nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry) |
| { |
| struct inode *inode = state->inode; |
| struct nfs_delegation *delegation = NFS_I(inode)->delegation; |
| struct nfs4_opendata *opendata; |
| int openflags = state->state & (FMODE_READ|FMODE_WRITE); |
| int ret; |
| |
| if (delegation != NULL && !(delegation->flags & NFS_DELEGATION_NEED_RECLAIM)) { |
| ret = _nfs4_do_access(inode, sp->so_cred, openflags); |
| if (ret < 0) |
| return ret; |
| memcpy(&state->stateid, &delegation->stateid, sizeof(state->stateid)); |
| set_bit(NFS_DELEGATED_STATE, &state->flags); |
| return 0; |
| } |
| opendata = nfs4_opendata_alloc(dentry, sp, openflags, NULL); |
| if (opendata == NULL) |
| return -ENOMEM; |
| ret = nfs4_open_recover(opendata, state); |
| if (ret == -ESTALE) { |
| /* Invalidate the state owner so we don't ever use it again */ |
| nfs4_drop_state_owner(sp); |
| d_drop(dentry); |
| } |
| nfs4_opendata_free(opendata); |
| return ret; |
| } |
| |
| static inline int nfs4_do_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry) |
| { |
| struct nfs_server *server = NFS_SERVER(dentry->d_inode); |
| struct nfs4_exception exception = { }; |
| int err; |
| |
| do { |
| err = _nfs4_open_expired(sp, state, dentry); |
| if (err == -NFS4ERR_DELAY) |
| nfs4_handle_exception(server, err, &exception); |
| } while (exception.retry); |
| 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 PTR_ERR(ctx); |
| ret = nfs4_do_open_expired(sp, state, ctx->dentry); |
| put_nfs_open_context(ctx); |
| return ret; |
| } |
| |
| /* |
| * Returns a referenced nfs4_state if there is an open delegation on the file |
| */ |
| static int _nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred *cred, struct nfs4_state **res) |
| { |
| struct nfs_delegation *delegation; |
| struct nfs_server *server = NFS_SERVER(inode); |
| struct nfs_client *clp = server->nfs_client; |
| struct nfs_inode *nfsi = NFS_I(inode); |
| struct nfs4_state_owner *sp = NULL; |
| struct nfs4_state *state = NULL; |
| int open_flags = flags & (FMODE_READ|FMODE_WRITE); |
| int err; |
| |
| err = -ENOMEM; |
| if (!(sp = nfs4_get_state_owner(server, cred))) { |
| dprintk("%s: nfs4_get_state_owner failed!\n", __FUNCTION__); |
| return err; |
| } |
| err = nfs4_recover_expired_lease(server); |
| if (err != 0) |
| goto out_put_state_owner; |
| /* Protect against reboot recovery - NOTE ORDER! */ |
| down_read(&clp->cl_sem); |
| /* Protect against delegation recall */ |
| down_read(&nfsi->rwsem); |
| delegation = NFS_I(inode)->delegation; |
| err = -ENOENT; |
| if (delegation == NULL || (delegation->type & open_flags) != open_flags) |
| goto out_err; |
| err = -ENOMEM; |
| state = nfs4_get_open_state(inode, sp); |
| if (state == NULL) |
| goto out_err; |
| |
| err = -ENOENT; |
| if ((state->state & open_flags) == open_flags) { |
| spin_lock(&inode->i_lock); |
| update_open_stateflags(state, open_flags); |
| spin_unlock(&inode->i_lock); |
| goto out_ok; |
| } else if (state->state != 0) |
| goto out_put_open_state; |
| |
| lock_kernel(); |
| err = _nfs4_do_access(inode, cred, open_flags); |
| unlock_kernel(); |
| if (err != 0) |
| goto out_put_open_state; |
| set_bit(NFS_DELEGATED_STATE, &state->flags); |
| update_open_stateid(state, &delegation->stateid, open_flags); |
| out_ok: |
| nfs4_put_state_owner(sp); |
| up_read(&nfsi->rwsem); |
| up_read(&clp->cl_sem); |
| *res = state; |
| return 0; |
| out_put_open_state: |
| nfs4_put_open_state(state); |
| out_err: |
| up_read(&nfsi->rwsem); |
| up_read(&clp->cl_sem); |
| if (err != -EACCES) |
| nfs_inode_return_delegation(inode); |
| out_put_state_owner: |
| nfs4_put_state_owner(sp); |
| return err; |
| } |
| |
| static struct nfs4_state *nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred *cred) |
| { |
| struct nfs4_exception exception = { }; |
| struct nfs4_state *res = ERR_PTR(-EIO); |
| int err; |
| |
| do { |
| err = _nfs4_open_delegated(inode, flags, cred, &res); |
| if (err == 0) |
| break; |
| res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(inode), |
| err, &exception)); |
| } while (exception.retry); |
| return res; |
| } |
| |
| /* |
| * Returns a referenced nfs4_state |
| */ |
| static int _nfs4_do_open(struct inode *dir, struct dentry *dentry, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res) |
| { |
| struct nfs4_state_owner *sp; |
| struct nfs4_state *state = NULL; |
| struct nfs_server *server = NFS_SERVER(dir); |
| struct nfs_client *clp = server->nfs_client; |
| struct nfs4_opendata *opendata; |
| int status; |
| |
| /* Protect against reboot recovery conflicts */ |
| status = -ENOMEM; |
| if (!(sp = nfs4_get_state_owner(server, cred))) { |
| dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n"); |
| goto out_err; |
| } |
| status = nfs4_recover_expired_lease(server); |
| if (status != 0) |
| goto err_put_state_owner; |
| down_read(&clp->cl_sem); |
| status = -ENOMEM; |
| opendata = nfs4_opendata_alloc(dentry, sp, flags, sattr); |
| if (opendata == NULL) |
| goto err_release_rwsem; |
| |
| status = _nfs4_proc_open(opendata); |
| if (status != 0) |
| goto err_opendata_free; |
| |
| status = -ENOMEM; |
| state = nfs4_opendata_to_nfs4_state(opendata); |
| if (state == NULL) |
| goto err_opendata_free; |
| if (opendata->o_res.delegation_type != 0) |
| nfs_inode_set_delegation(state->inode, cred, &opendata->o_res); |
| nfs4_opendata_free(opendata); |
| nfs4_put_state_owner(sp); |
| up_read(&clp->cl_sem); |
| *res = state; |
| return 0; |
| err_opendata_free: |
| nfs4_opendata_free(opendata); |
| err_release_rwsem: |
| up_read(&clp->cl_sem); |
| err_put_state_owner: |
| nfs4_put_state_owner(sp); |
| out_err: |
| *res = NULL; |
| return status; |
| } |
| |
| |
| static struct nfs4_state *nfs4_do_open(struct inode *dir, struct dentry *dentry, int flags, struct iattr *sattr, struct rpc_cred *cred) |
| { |
| struct nfs4_exception exception = { }; |
| struct nfs4_state *res; |
| int status; |
| |
| do { |
| status = _nfs4_do_open(dir, dentry, flags, sattr, cred, &res); |
| 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) { |
| printk(KERN_WARNING "NFS: v4 server returned a bad sequence-id error!\n"); |
| 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; |
| } |
| res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir), |
| status, &exception)); |
| } while (exception.retry); |
| return res; |
| } |
| |
| static int _nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr, |
| struct iattr *sattr, struct nfs4_state *state) |
| { |
| struct nfs_server *server = NFS_SERVER(inode); |
| struct nfs_setattrargs arg = { |
| .fh = NFS_FH(inode), |
| .iap = sattr, |
| .server = server, |
| .bitmask = server->attr_bitmask, |
| }; |
| struct nfs_setattrres res = { |
| .fattr = fattr, |
| .server = server, |
| }; |
| struct rpc_message msg = { |
| .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR], |
| .rpc_argp = &arg, |
| .rpc_resp = &res, |
| }; |
| unsigned long timestamp = jiffies; |
| int status; |
| |
| nfs_fattr_init(fattr); |
| |
| if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) { |
| /* Use that stateid */ |
| } else if (state != NULL) { |
| msg.rpc_cred = state->owner->so_cred; |
| nfs4_copy_stateid(&arg.stateid, state, current->files); |
| } else |
| memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid)); |
| |
| status = rpc_call_sync(server->client, &msg, 0); |
| if (status == 0 && state != NULL) |
| renew_lease(server, timestamp); |
| return status; |
| } |
| |
| static int nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr, |
| struct iattr *sattr, struct nfs4_state *state) |
| { |
| struct nfs_server *server = NFS_SERVER(inode); |
| struct nfs4_exception exception = { }; |
| int err; |
| do { |
| err = nfs4_handle_exception(server, |
| _nfs4_do_setattr(inode, fattr, sattr, state), |
| &exception); |
| } while (exception.retry); |
| return err; |
| } |
| |
| struct nfs4_closedata { |
| struct inode *inode; |
| struct nfs4_state *state; |
| struct nfs_closeargs arg; |
| struct nfs_closeres res; |
| struct nfs_fattr fattr; |
| unsigned long timestamp; |
| }; |
| |
| static void nfs4_free_closedata(void *data) |
| { |
| struct nfs4_closedata *calldata = data; |
| struct nfs4_state_owner *sp = calldata->state->owner; |
| |
| nfs4_put_open_state(calldata->state); |
| nfs_free_seqid(calldata->arg.seqid); |
| nfs4_put_state_owner(sp); |
| kfree(calldata); |
| } |
| |
| static void nfs4_close_done(struct rpc_task *task, void *data) |
| { |
| struct nfs4_closedata *calldata = data; |
| struct nfs4_state *state = calldata->state; |
| struct nfs_server *server = NFS_SERVER(calldata->inode); |
| |
| if (RPC_ASSASSINATED(task)) |
| return; |
| /* hmm. we are done with the inode, and in the process of freeing |
| * the state_owner. we keep this around to process errors |
| */ |
| nfs_increment_open_seqid(task->tk_status, calldata->arg.seqid); |
| switch (task->tk_status) { |
| case 0: |
| memcpy(&state->stateid, &calldata->res.stateid, |
| sizeof(state->stateid)); |
| renew_lease(server, calldata->timestamp); |
| break; |
| case -NFS4ERR_STALE_STATEID: |
| case -NFS4ERR_EXPIRED: |
| break; |
| default: |
| if (nfs4_async_handle_error(task, server) == -EAGAIN) { |
| rpc_restart_call(task); |
| return; |
| } |
| } |
| nfs_refresh_inode(calldata->inode, calldata->res.fattr); |
| } |
| |
| static void nfs4_close_prepare(struct rpc_task *task, void *data) |
| { |
| struct nfs4_closedata *calldata = data; |
| struct nfs4_state *state = calldata->state; |
| struct rpc_message msg = { |
| .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE], |
| .rpc_argp = &calldata->arg, |
| .rpc_resp = &calldata->res, |
| .rpc_cred = state->owner->so_cred, |
| }; |
| int mode = 0, old_mode; |
| |
| if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0) |
| return; |
| /* Recalculate the new open mode in case someone reopened the file |
| * while we were waiting in line to be scheduled. |
| */ |
| spin_lock(&state->owner->so_lock); |
| spin_lock(&calldata->inode->i_lock); |
| mode = old_mode = state->state; |
| if (state->n_rdwr == 0) { |
| if (state->n_rdonly == 0) |
| mode &= ~FMODE_READ; |
| if (state->n_wronly == 0) |
| mode &= ~FMODE_WRITE; |
| } |
| nfs4_state_set_mode_locked(state, mode); |
| spin_unlock(&calldata->inode->i_lock); |
| spin_unlock(&state->owner->so_lock); |
| if (mode == old_mode || test_bit(NFS_DELEGATED_STATE, &state->flags)) { |
| /* Note: exit _without_ calling nfs4_close_done */ |
| task->tk_action = NULL; |
| return; |
| } |
| nfs_fattr_init(calldata->res.fattr); |
| if (mode != 0) |
| msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE]; |
| calldata->arg.open_flags = mode; |
| calldata->timestamp = jiffies; |
| rpc_call_setup(task, &msg, 0); |
| } |
| |
| static const struct rpc_call_ops nfs4_close_ops = { |
| .rpc_call_prepare = nfs4_close_prepare, |
| .rpc_call_done = nfs4_close_done, |
| .rpc_release = nfs4_free_closedata, |
| }; |
| |
| /* |
| * It is possible for data to be read/written from a mem-mapped file |
| * after the sys_close call (which hits the vfs layer as a flush). |
| * This means that we can't safely call nfsv4 close on a file until |
| * the inode is cleared. This in turn means that we are not good |
| * NFSv4 citizens - we do not indicate to the server to update the file's |
| * share state even when we are done with one of the three share |
| * stateid's in the inode. |
| * |
| * NOTE: Caller must be holding the sp->so_owner semaphore! |
| */ |
| int nfs4_do_close(struct inode *inode, struct nfs4_state *state) |
| { |
| struct nfs_server *server = NFS_SERVER(inode); |
| struct nfs4_closedata *calldata; |
| int status = -ENOMEM; |
| |
| calldata = kmalloc(sizeof(*calldata), GFP_KERNEL); |
| if (calldata == NULL) |
| goto out; |
| calldata->inode = inode; |
| calldata->state = state; |
| calldata->arg.fh = NFS_FH(inode); |
| calldata->arg.stateid = &state->stateid; |
| /* Serialization for the sequence id */ |
| calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid); |
| if (calldata->arg.seqid == NULL) |
| goto out_free_calldata; |
| calldata->arg.bitmask = server->attr_bitmask; |
| calldata->res.fattr = &calldata->fattr; |
| calldata->res.server = server; |
| |
| status = nfs4_call_async(server->client, &nfs4_close_ops, calldata); |
| if (status == 0) |
| goto out; |
| |
| nfs_free_seqid(calldata->arg.seqid); |
| out_free_calldata: |
| kfree(calldata); |
| out: |
| return status; |
| } |
| |
| static int nfs4_intent_set_file(struct nameidata *nd, struct dentry *dentry, struct nfs4_state *state) |
| { |
| struct file *filp; |
| |
| filp = lookup_instantiate_filp(nd, dentry, NULL); |
| if (!IS_ERR(filp)) { |
| struct nfs_open_context *ctx; |
| ctx = (struct nfs_open_context *)filp->private_data; |
| ctx->state = state; |
| return 0; |
| } |
| nfs4_close_state(state, nd->intent.open.flags); |
| return PTR_ERR(filp); |
| } |
| |
| struct dentry * |
| nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd) |
| { |
| struct iattr attr; |
| struct rpc_cred *cred; |
| struct nfs4_state *state; |
| struct dentry *res; |
| |
| if (nd->flags & LOOKUP_CREATE) { |
| attr.ia_mode = nd->intent.open.create_mode; |
| attr.ia_valid = ATTR_MODE; |
| if (!IS_POSIXACL(dir)) |
| attr.ia_mode &= ~current->fs->umask; |
| } else { |
| attr.ia_valid = 0; |
| BUG_ON(nd->intent.open.flags & O_CREAT); |
| } |
| |
| cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0); |
| if (IS_ERR(cred)) |
| return (struct dentry *)cred; |
| state = nfs4_do_open(dir, dentry, nd->intent.open.flags, &attr, cred); |
| put_rpccred(cred); |
| if (IS_ERR(state)) { |
| if (PTR_ERR(state) == -ENOENT) |
| d_add(dentry, NULL); |
| return (struct dentry *)state; |
| } |
| res = d_add_unique(dentry, igrab(state->inode)); |
| if (res != NULL) |
| dentry = res; |
| nfs4_intent_set_file(nd, dentry, state); |
| return res; |
| } |
| |
| int |
| nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd) |
| { |
| struct rpc_cred *cred; |
| struct nfs4_state *state; |
| |
| cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0); |
| if (IS_ERR(cred)) |
| return PTR_ERR(cred); |
| state = nfs4_open_delegated(dentry->d_inode, openflags, cred); |
| if (IS_ERR(state)) |
| state = nfs4_do_open(dir, dentry, openflags, NULL, cred); |
| put_rpccred(cred); |
| if (IS_ERR(state)) { |
| switch (PTR_ERR(state)) { |
| case -EPERM: |
| case -EACCES: |
| case -EDQUOT: |
| case -ENOSPC: |
| case -EROFS: |
| lookup_instantiate_filp(nd, (struct dentry *)state, NULL); |
| return 1; |
| default: |
| goto out_drop; |
| } |
| } |
| if (state->inode == dentry->d_inode) { |
| nfs4_intent_set_file(nd, dentry, state); |
| return 1; |
| } |
| nfs4_close_state(state, openflags); |
| out_drop: |
| d_drop(dentry); |
| return 0; |
| } |
| |
| |
| static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle) |
| { |
| struct nfs4_server_caps_res res = {}; |
| struct rpc_message msg = { |
| .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS], |
| .rpc_argp = fhandle, |
| .rpc_resp = &res, |
| }; |
| int status; |
| |
| status = rpc_call_sync(server->client, &msg, 0); |
| if (status == 0) { |
| memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask)); |
| if (res.attr_bitmask[0] & FATTR4_WORD0_ACL) |
| server->caps |= NFS_CAP_ACLS; |
| if (res.has_links != 0) |
| server->caps |= NFS_CAP_HARDLINKS; |
| if (res.has_symlinks != 0) |
| server->caps |= NFS_CAP_SYMLINKS; |
| server->acl_bitmask = res.acl_bitmask; |
| } |
| return status; |
| } |
| |
| int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle) |
| { |
| struct nfs4_exception exception = { }; |
| int err; |
| do { |
| err = nfs4_handle_exception(server, |
| _nfs4_server_capabilities(server, fhandle), |
| &exception); |
| } while (exception.retry); |
| return err; |
| } |
| |
| static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle, |
| struct nfs_fsinfo *info) |
| { |
| struct nfs4_lookup_root_arg args = { |
| .bitmask = nfs4_fattr_bitmap, |
| }; |
| struct nfs4_lookup_res res = { |
| .server = server, |
| .fattr = info->fattr, |
| .fh = fhandle, |
| }; |
| struct rpc_message msg = { |
| .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT], |
| .rpc_argp = &args, |
| .rpc_resp = &res, |
| }; |
| nfs_fattr_init(info->fattr); |
| return rpc_call_sync(server->client, &msg, 0); |
| } |
| |
| static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle, |
| struct nfs_fsinfo *info) |
| { |
| struct nfs4_exception exception = { }; |
| int err; |
| do { |
| err = nfs4_handle_exception(server, |
| _nfs4_lookup_root(server, fhandle, info), |
| &exception); |
| } while (exception.retry); |
| return err; |
| } |
| |
| /* |
| * get the file handle for the "/" directory on the server |
| */ |
| static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle, |
| struct nfs_fsinfo *info) |
| { |
| int status; |
| |
| status = nfs4_lookup_root(server, fhandle, info); |
| if (status == 0) |
| status = nfs4_server_capabilities(server, fhandle); |
| if (status == 0) |
| status = nfs4_do_fsinfo(server, fhandle, info); |
| return nfs4_map_errors(status); |
| } |
| |
| /* |
| * Get locations and (maybe) other attributes of a referral. |
| * Note that we'll actually follow the referral later when |
| * we detect fsid mismatch in inode revalidation |
| */ |
| static int nfs4_get_referral(struct inode *dir, struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle) |
| { |
| int status = -ENOMEM; |
| struct page *page = NULL; |
| struct nfs4_fs_locations *locations = NULL; |
| |
| page = alloc_page(GFP_KERNEL); |
| if (page == NULL) |
| goto out; |
| locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL); |
| if (locations == NULL) |
| goto out; |
| |
| status = nfs4_proc_fs_locations(dir, name, locations, page); |
| if (status != 0) |
| goto out; |
| /* Make sure server returned a different fsid for the referral */ |
| if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) { |
| dprintk("%s: server did not return a different fsid for a referral at %s\n", __FUNCTION__, name->name); |
| status = -EIO; |
| goto out; |
| } |
| |
| memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr)); |
| fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL; |
| if (!fattr->mode) |
| fattr->mode = S_IFDIR; |
| memset(fhandle, 0, sizeof(struct nfs_fh)); |
| out: |
| if (page) |
| __free_page(page); |
| if (locations) |
| kfree(locations); |
| return status; |
| } |
| |
| static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr) |
| { |
| struct nfs4_getattr_arg args = { |
| .fh = fhandle, |
| .bitmask = server->attr_bitmask, |
| }; |
| struct nfs4_getattr_res res = { |
| .fattr = fattr, |
| .server = server, |
| }; |
| struct rpc_message msg = { |
| .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR], |
| .rpc_argp = &args, |
| .rpc_resp = &res, |
| }; |
| |
| nfs_fattr_init(fattr); |
| return rpc_call_sync(server->client, &msg, 0); |
| } |
| |
| static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr) |
| { |
| struct nfs4_exception exception = { }; |
| int err; |
| do { |
| err = nfs4_handle_exception(server, |
| _nfs4_proc_getattr(server, fhandle, fattr), |
| &exception); |
| } while (exception.retry); |
| return err; |
| } |
| |
| /* |
| * The file is not closed if it is opened due to the a request to change |
| * the size of the file. The open call will not be needed once the |
| * VFS layer lookup-intents are implemented. |
| * |
| * Close is called when the inode is destroyed. |
| * If we haven't opened the file for O_WRONLY, we |
| * need to in the size_change case to obtain a stateid. |
| * |
| * Got race? |
| * Because OPEN is always done by name in nfsv4, it is |
| * possible that we opened a different file by the same |
| * name. We can recognize this race condition, but we |
| * can't do anything about it besides returning an error. |
| * |
| * This will be fixed with VFS changes (lookup-intent). |
| */ |
| static int |
| nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr, |
| struct iattr *sattr) |
| { |
| struct rpc_cred *cred; |
| struct inode *inode = dentry->d_inode; |
| struct nfs_open_context *ctx; |
| struct nfs4_state *state = NULL; |
| int status; |
| |
| nfs_fattr_init(fattr); |
| |
| cred = rpcauth_lookupcred(NFS_CLIENT(inode)->cl_auth, 0); |
| if (IS_ERR(cred)) |
| return PTR_ERR(cred); |
| |
| /* Search for an existing open(O_WRITE) file */ |
| ctx = nfs_find_open_context(inode, cred, FMODE_WRITE); |
| if (ctx != NULL) |
| state = ctx->state; |
| |
| status = nfs4_do_setattr(inode, fattr, sattr, state); |
| if (status == 0) |
| nfs_setattr_update_inode(inode, sattr); |
| if (ctx != NULL) |
| put_nfs_open_context(ctx); |
| put_rpccred(cred); |
| return status; |
| } |
| |
| static int _nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh, |
| struct qstr *name, struct nfs_fh *fhandle, |
| struct nfs_fattr *fattr) |
| { |
| int status; |
| struct nfs4_lookup_arg args = { |
| .bitmask = server->attr_bitmask, |
| .dir_fh = dirfh, |
| .name = name, |
| }; |
| struct nfs4_lookup_res res = { |
| .server = server, |
| .fattr = fattr, |
| .fh = fhandle, |
| }; |
| struct rpc_message msg = { |
| .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP], |
| .rpc_argp = &args, |
| .rpc_resp = &res, |
| }; |
| |
| nfs_fattr_init(fattr); |
| |
| dprintk("NFS call lookupfh %s\n", name->name); |
| status = rpc_call_sync(server->client, &msg, 0); |
| dprintk("NFS reply lookupfh: %d\n", status); |
| if (status == -NFS4ERR_MOVED) |
| status = -EREMOTE; |
| return status; |
| } |
| |
| static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh, |
| struct qstr *name, struct nfs_fh *fhandle, |
| struct nfs_fattr *fattr) |
| { |
| struct nfs4_exception exception = { }; |
| int err; |
| do { |
| err = nfs4_handle_exception(server, |
| _nfs4_proc_lookupfh(server, dirfh, name, |
| fhandle, fattr), |
| &exception); |
| } while (exception.retry); |
| return err; |
| } |
| |
| static int _nfs4_proc_lookup(struct inode *dir, struct qstr *name, |
| struct nfs_fh *fhandle, struct nfs_fattr *fattr) |
| { |
| int status; |
| struct nfs_server *server = NFS_SERVER(dir); |
| struct nfs4_lookup_arg args = { |
| .bitmask = server->attr_bitmask, |
| .dir_fh = NFS_FH(dir), |
| .name = name, |
| }; |
| struct nfs4_lookup_res res = { |
| .server = server, |
| .fattr = fattr, |
| .fh = fhandle, |
| }; |
| struct rpc_message msg = { |
| .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP], |
| .rpc_argp = &args, |
| .rpc_resp = &res, |
| }; |
| |
| nfs_fattr_init(fattr); |
| |
| dprintk("NFS call lookup %s\n", name->name); |
| status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); |
| if (status == -NFS4ERR_MOVED) |
| status = nfs4_get_referral(dir, name, fattr, fhandle); |
| dprintk("NFS reply lookup: %d\n", status); |
| return status; |
| } |
| |
| static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr) |
| { |
| struct nfs4_exception exception = { }; |
| int err; |
| do { |
| err = nfs4_handle_exception(NFS_SERVER(dir), |
| _nfs4_proc_lookup(dir, name, fhandle, fattr), |
| &exception); |
| } while (exception.retry); |
| return err; |
| } |
| |
| static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry) |
| { |
| struct nfs4_accessargs args = { |
| .fh = NFS_FH(inode), |
| }; |
| struct nfs4_accessres res = { 0 }; |
| struct rpc_message msg = { |
| .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS], |
| .rpc_argp = &args, |
| .rpc_resp = &res, |
| .rpc_cred = entry->cred, |
| }; |
| int mode = entry->mask; |
| int status; |
| |
| /* |
| * Determine which access bits we want to ask for... |
| */ |
| if (mode & MAY_READ) |
| args.access |= NFS4_ACCESS_READ; |
| if (S_ISDIR(inode->i_mode)) { |
| if (mode & MAY_WRITE) |
| args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE; |
| if (mode & MAY_EXEC) |
| args.access |= NFS4_ACCESS_LOOKUP; |
| } else { |
| if (mode & MAY_WRITE) |
| args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND; |
| if (mode & MAY_EXEC) |
| args.access |= NFS4_ACCESS_EXECUTE; |
| } |
| status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0); |
| if (!status) { |
| entry->mask = 0; |
| if (res.access & NFS4_ACCESS_READ) |
| entry->mask |= MAY_READ; |
| if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE)) |
| entry->mask |= MAY_WRITE; |
| if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE)) |
| entry->mask |= MAY_EXEC; |
| } |
| return status; |
| } |
| |
| static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry) |
| { |
| struct nfs4_exception exception = { }; |
| int err; |
| do { |
| err = nfs4_handle_exception(NFS_SERVER(inode), |
| _nfs4_proc_access(inode, entry), |
| &exception); |
| } while (exception.retry); |
| return err; |
| } |
| |
| /* |
| * TODO: For the time being, we don't try to get any attributes |
| * along with any of the zero-copy operations READ, READDIR, |
| * READLINK, WRITE. |
| * |
| * In the case of the first three, we want to put the GETATTR |
| * after the read-type operation -- this is because it is hard |
| * to predict the length of a GETATTR response in v4, and thus |
| * align the READ data correctly. This means that the GETATTR |
| * may end up partially falling into the page cache, and we should |
| * shift it into the 'tail' of the xdr_buf before processing. |
| * To do this efficiently, we need to know the total length |
| * of data received, which doesn't seem to be available outside |
| * of the RPC layer. |
| * |
| * In the case of WRITE, we also want to put the GETATTR after |
| * the operation -- in this case because we want to make sure |
| * we get the post-operation mtime and size. This means that |
| * we can't use xdr_encode_pages() as written: we need a variant |
| * of it which would leave room in the 'tail' iovec. |
| * |
| * Both of these changes to the XDR layer would in fact be quite |
| * minor, but I decided to leave them for a subsequent patch. |
| */ |
| static int _nfs4_proc_readlink(struct inode *inode, struct page *page, |
| unsigned int pgbase, unsigned int pglen) |
| { |
| struct nfs4_readlink args = { |
| .fh = NFS_FH(inode), |
| .pgbase = pgbase, |
| .pglen = pglen, |
| .pages = &page, |
| }; |
| struct rpc_message msg = { |
| .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK], |
| .rpc_argp = &args, |
| .rpc_resp = NULL, |
| }; |
| |
| return rpc_call_sync(NFS_CLIENT(inode), &msg, 0); |
| } |
| |
| static int nfs4_proc_readlink(struct inode *inode, struct page *page, |
| unsigned int pgbase, unsigned int pglen) |
| { |
| struct nfs4_exception exception = { }; |
| int err; |
| do { |
| err = nfs4_handle_exception(NFS_SERVER(inode), |
| _nfs4_proc_readlink(inode, page, pgbase, pglen), |
| &exception); |
| } while (exception.retry); |
| return err; |
| } |
| |
| /* |
| * Got race? |
| * We will need to arrange for the VFS layer to provide an atomic open. |
| * Until then, this create/open method is prone to inefficiency and race |
| * conditions due to the lookup, create, and open VFS calls from sys_open() |
| * placed on the wire. |
| * |
| * Given the above sorry state of affairs, I'm simply sending an OPEN. |
| * The file will be opened again in the subsequent VFS open call |
| * (nfs4_proc_file_open). |
| * |
| * The open for read will just hang around to be used by any process that |
| * opens the file O_RDONLY. This will all be resolved with the VFS changes. |
| */ |
| |
| static int |
| nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr, |
| int flags, struct nameidata *nd) |
| { |
| struct nfs4_state *state; |
| struct rpc_cred *cred; |
| int status = 0; |
| |
| cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0); |
| if (IS_ERR(cred)) { |
| status = PTR_ERR(cred); |
| goto out; |
| } |
| state = nfs4_do_open(dir, dentry, flags, sattr, cred); |
| put_rpccred(cred); |
| if (IS_ERR(state)) { |
| status = PTR_ERR(state); |
| goto out; |
| } |
| d_instantiate(dentry, igrab(state->inode)); |
| if (flags & O_EXCL) { |
| struct nfs_fattr fattr; |
| status = nfs4_do_setattr(state->inode, &fattr, sattr, state); |
| if (status == 0) |
| nfs_setattr_update_inode(state->inode, sattr); |
| } |
| if (status == 0 && nd != NULL && (nd->flags & LOOKUP_OPEN)) |
| status = nfs4_intent_set_file(nd, dentry, state); |
| else |
| nfs4_close_state(state, flags); |
| out: |
| return status; |
| } |
| |
| static int _nfs4_proc_remove(struct inode *dir, struct qstr *name) |
| { |
| struct nfs_server *server = NFS_SERVER(dir); |
| struct nfs4_remove_arg args = { |
| .fh = NFS_FH(dir), |
| .name = name, |
| .bitmask = server->attr_bitmask, |
| }; |
| struct nfs_fattr dir_attr; |
| struct nfs4_remove_res res = { |
| .server = server, |
| .dir_attr = &dir_attr, |
| }; |
| struct rpc_message msg = { |
| .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE], |
| .rpc_argp = &args, |
| .rpc_resp = &res, |
| }; |
| int status; |
| |
| nfs_fattr_init(res.dir_attr); |
| status = rpc_call_sync(server->client, &msg, 0); |
| if (status == 0) { |
| update_changeattr(dir, &res.cinfo); |
| nfs_post_op_update_inode(dir, res.dir_attr); |
| } |
| return status; |
| } |
| |
| static int nfs4_proc_remove(struct inode *dir, struct qstr *name) |
| { |
| struct nfs4_exception exception = { }; |
| int err; |
| do { |
| err = nfs4_handle_exception(NFS_SERVER(dir), |
| _nfs4_proc_remove(dir, name), |
| &exception); |
| } while (exception.retry); |
| return err; |
| } |
| |
| struct unlink_desc { |
| struct nfs4_remove_arg args; |
| struct nfs4_remove_res res; |
| struct nfs_fattr dir_attr; |
| }; |
| |
| static int nfs4_proc_unlink_setup(struct rpc_message *msg, struct dentry *dir, |
| struct qstr *name) |
| { |
| struct nfs_server *server = NFS_SERVER(dir->d_inode); |
| struct unlink_desc *up; |
| |
| up = kmalloc(sizeof(*up), GFP_KERNEL); |
| if (!up) |
| return -ENOMEM; |
| |
| up->args.fh = NFS_FH(dir->d_inode); |
| up->args.name = name; |
| up->args.bitmask = server->attr_bitmask; |
| up->res.server = server; |
| up->res.dir_attr = &up->dir_attr; |
| |
| msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE]; |
| msg->rpc_argp = &up->args; |
| msg->rpc_resp = &up->res; |
| return 0; |
| } |
| |
| static int nfs4_proc_unlink_done(struct dentry *dir, struct rpc_task *task) |
| { |
| struct rpc_message *msg = &task->tk_msg; |
| struct unlink_desc *up; |
| |
| if (msg->rpc_resp != NULL) { |
| up = container_of(msg->rpc_resp, struct unlink_desc, res); |
| update_changeattr(dir->d_inode, &up->res.cinfo); |
| nfs_post_op_update_inode(dir->d_inode, up->res.dir_attr); |
| kfree(up); |
| msg->rpc_resp = NULL; |
| msg->rpc_argp = NULL; |
| } |
| return 0; |
| } |
| |
| static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name, |
| struct inode *new_dir, struct qstr *new_name) |
| { |
| struct nfs_server *server = NFS_SERVER(old_dir); |
| struct nfs4_rename_arg arg = { |
| .old_dir = NFS_FH(old_dir), |
| .new_dir = NFS_FH(new_dir), |
| .old_name = old_name, |
| .new_name = new_name, |
| .bitmask = server->attr_bitmask, |
| }; |
| struct nfs_fattr old_fattr, new_fattr; |
| struct nfs4_rename_res res = { |
| .server = server, |
| .old_fattr = &old_fattr, |
| .new_fattr = &new_fattr, |
| }; |
| struct rpc_message msg = { |
| .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME], |
| .rpc_argp = &arg, |
| .rpc_resp = &res, |
| }; |
| int status; |
| |
| nfs_fattr_init(res.old_fattr); |
| nfs_fattr_init(res.new_fattr); |
| status = rpc_call_sync(server->client, &msg, 0); |
| |
| if (!status) { |
| update_changeattr(old_dir, &res.old_cinfo); |
| nfs_post_op_update_inode(old_dir, res.old_fattr); |
| update_changeattr(new_dir, &res.new_cinfo); |
| nfs_post_op_update_inode(new_dir, res.new_fattr); |
| } |
| return status; |
| } |
| |
| static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name, |
| struct inode *new_dir, struct qstr *new_name) |
| { |
| struct nfs4_exception exception = { }; |
| int err; |
| do { |
| err = nfs4_handle_exception(NFS_SERVER(old_dir), |
| _nfs4_proc_rename(old_dir, old_name, |
| new_dir, new_name), |
| &exception); |
| } while (exception.retry); |
| return err; |
| } |
| |
| static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name) |
| { |
| struct nfs_server *server = NFS_SERVER(inode); |
| struct nfs4_link_arg arg = { |
| .fh = NFS_FH(inode), |
| .dir_fh = NFS_FH(dir), |
| .name = name, |
| .bitmask = server->attr_bitmask, |
| }; |
| struct nfs_fattr fattr, dir_attr; |
| struct nfs4_link_res res = { |
| .server = server, |
| .fattr = &fattr, |
| .dir_attr = &dir_attr, |
| }; |
| struct rpc_message msg = { |
| .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK], |
| .rpc_argp = &arg, |
| .rpc_resp = &res, |
| }; |
| int status; |
| |
| nfs_fattr_init(res.fattr); |
| nfs_fattr_init(res.dir_attr); |
| status = rpc_call_sync(server->client, &msg, 0); |
| if (!status) { |
| update_changeattr(dir, &res.cinfo); |
| nfs_post_op_update_inode(dir, res.dir_attr); |
| nfs_post_op_update_inode(inode, res.fattr); |
| } |
| |
| return status; |
| } |
| |
| static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name) |
| { |
| struct nfs4_exception exception = { }; |
| int err; |
| do { |
| err = nfs4_handle_exception(NFS_SERVER(inode), |
| _nfs4_proc_link(inode, dir, name), |
| &exception); |
| } while (exception.retry); |
| return err; |
| } |
| |
| static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry, |
| struct page *page, unsigned int len, struct iattr *sattr) |
| { |
| struct nfs_server *server = NFS_SERVER(dir); |
| struct nfs_fh fhandle; |
| struct nfs_fattr fattr, dir_fattr; |
| struct nfs4_create_arg arg = { |
| .dir_fh = NFS_FH(dir), |
| .server = server, |
| .name = &dentry->d_name, |
| .attrs = sattr, |
| .ftype = NF4LNK, |
| .bitmask = server->attr_bitmask, |
| }; |
| struct nfs4_create_res res = { |
| .server = server, |
| .fh = &fhandle, |
| .fattr = &fattr, |
| .dir_fattr = &dir_fattr, |
| }; |
| struct rpc_message msg = { |
| .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK], |
| .rpc_argp = &arg, |
| .rpc_resp = &res, |
| }; |
| int status; |
| |
| if (len > NFS4_MAXPATHLEN) |
| return -ENAMETOOLONG; |
| |
| arg.u.symlink.pages = &page; |
| arg.u.symlink.len = len; |
| nfs_fattr_init(&fattr); |
| nfs_fattr_init(&dir_fattr); |
| |
| status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); |
| if (!status) { |
| update_changeattr(dir, &res.dir_cinfo); |
| nfs_post_op_update_inode(dir, res.dir_fattr); |
| status = nfs_instantiate(dentry, &fhandle, &fattr); |
| } |
| return status; |
| } |
| |
| static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry, |
| struct page *page, unsigned int len, struct iattr *sattr) |
| { |
| struct nfs4_exception exception = { }; |
| int err; |
| do { |
| err = nfs4_handle_exception(NFS_SERVER(dir), |
| _nfs4_proc_symlink(dir, dentry, page, |
| len, sattr), |
| &exception); |
| } while (exception.retry); |
| return err; |
| } |
| |
| static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry, |
| struct iattr *sattr) |
| { |
| struct nfs_server *server = NFS_SERVER(dir); |
| struct nfs_fh fhandle; |
| struct nfs_fattr fattr, dir_fattr; |
| struct nfs4_create_arg arg = { |
| .dir_fh = NFS_FH(dir), |
| .server = server, |
| .name = &dentry->d_name, |
| .attrs = sattr, |
| .ftype = NF4DIR, |
| .bitmask = server->attr_bitmask, |
| }; |
| struct nfs4_create_res res = { |
| .server = server, |
| .fh = &fhandle, |
| .fattr = &fattr, |
| .dir_fattr = &dir_fattr, |
| }; |
| struct rpc_message msg = { |
| .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE], |
| .rpc_argp = &arg, |
| .rpc_resp = &res, |
| }; |
| int status; |
| |
| nfs_fattr_init(&fattr); |
| nfs_fattr_init(&dir_fattr); |
| |
| status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); |
| if (!status) { |
| update_changeattr(dir, &res.dir_cinfo); |
| nfs_post_op_update_inode(dir, res.dir_fattr); |
| status = nfs_instantiate(dentry, &fhandle, &fattr); |
| } |
| return status; |
| } |
| |
| static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry, |
| struct iattr *sattr) |
| { |
| struct nfs4_exception exception = { }; |
| int err; |
| do { |
| err = nfs4_handle_exception(NFS_SERVER(dir), |
| _nfs4_proc_mkdir(dir, dentry, sattr), |
| &exception); |
| } while (exception.retry); |
| return err; |
| } |
| |
| static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred, |
| u64 cookie, struct page *page, unsigned int count, int plus) |
| { |
| struct inode *dir = dentry->d_inode; |
| struct nfs4_readdir_arg args = { |
| .fh = NFS_FH(dir), |
| .pages = &page, |
| .pgbase = 0, |
| .count = count, |
| .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask, |
| }; |
| struct nfs4_readdir_res res; |
| struct rpc_message msg = { |
| .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR], |
| .rpc_argp = &args, |
| .rpc_resp = &res, |
| .rpc_cred = cred, |
| }; |
| int status; |
| |
| dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __FUNCTION__, |
| dentry->d_parent->d_name.name, |
| dentry->d_name.name, |
| (unsigned long long)cookie); |
| nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args); |
| res.pgbase = args.pgbase; |
| status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); |
| if (status == 0) |
| memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE); |
| dprintk("%s: returns %d\n", __FUNCTION__, status); |
| return status; |
| } |
| |
| static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred, |
| u64 cookie, struct page *page, unsigned int count, int plus) |
| { |
| struct nfs4_exception exception = { }; |
| int err; |
| do { |
| err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode), |
| _nfs4_proc_readdir(dentry, cred, cookie, |
| page, count, plus), |
| &exception); |
| } while (exception.retry); |
| return err; |
| } |
| |
| static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry, |
| struct iattr *sattr, dev_t rdev) |
| { |
| struct nfs_server *server = NFS_SERVER(dir); |
| struct nfs_fh fh; |
| struct nfs_fattr fattr, dir_fattr; |
| struct nfs4_create_arg arg = { |
| .dir_fh = NFS_FH(dir), |
| .server = server, |
| .name = &dentry->d_name, |
| .attrs = sattr, |
| .bitmask = server->attr_bitmask, |
| }; |
| struct nfs4_create_res res = { |
| .server = server, |
| .fh = &fh, |
| .fattr = &fattr, |
| .dir_fattr = &dir_fattr, |
| }; |
| struct rpc_message msg = { |
| .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE], |
| .rpc_argp = &arg, |
| .rpc_resp = &res, |
| }; |
| int status; |
| int mode = sattr->ia_mode; |
| |
| nfs_fattr_init(&fattr); |
| nfs_fattr_init(&dir_fattr); |
| |
| BUG_ON(!(sattr->ia_valid & ATTR_MODE)); |
| BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode)); |
| if (S_ISFIFO(mode)) |
| arg.ftype = NF4FIFO; |
| else if (S_ISBLK(mode)) { |
| arg.ftype = NF4BLK; |
| arg.u.device.specdata1 = MAJOR(rdev); |
| arg.u.device.specdata2 = MINOR(rdev); |
| } |
| else if (S_ISCHR(mode)) { |
| arg.ftype = NF4CHR; |
| arg.u.device.specdata1 = MAJOR(rdev); |
| arg.u.device.specdata2 = MINOR(rdev); |
| } |
| else |
| arg.ftype = NF4SOCK; |
| |
| status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); |
| if (status == 0) { |
| update_changeattr(dir, &res.dir_cinfo); |
| nfs_post_op_update_inode(dir, res.dir_fattr); |
| status = nfs_instantiate(dentry, &fh, &fattr); |
| } |
| return status; |
| } |
| |
| static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry, |
| struct iattr *sattr, dev_t rdev) |
| { |
| struct nfs4_exception exception = { }; |
| int err; |
| do { |
| err = nfs4_handle_exception(NFS_SERVER(dir), |
| _nfs4_proc_mknod(dir, dentry, sattr, rdev), |
| &exception); |
| } while (exception.retry); |
| return err; |
| } |
| |
| static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, |
| struct nfs_fsstat *fsstat) |
| { |
| struct nfs4_statfs_arg args = { |
| .fh = fhandle, |
| .bitmask = server->attr_bitmask, |
| }; |
| struct rpc_message msg = { |
| .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS], |
| .rpc_argp = &args, |
| .rpc_resp = fsstat, |
| }; |
| |
| nfs_fattr_init(fsstat->fattr); |
| return rpc_call_sync(server->client, &msg, 0); |
| } |
| |
| static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat) |
| { |
| struct nfs4_exception exception = { }; |
| int err; |
| do { |
| err = nfs4_handle_exception(server, |
| _nfs4_proc_statfs(server, fhandle, fsstat), |
| &exception); |
| } while (exception.retry); |
| return err; |
| } |
| |
| static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, |
| struct nfs_fsinfo *fsinfo) |
| { |
| struct nfs4_fsinfo_arg args = { |
| .fh = fhandle, |
| .bitmask = server->attr_bitmask, |
| }; |
| struct rpc_message msg = { |
| .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO], |
| .rpc_argp = &args, |
| .rpc_resp = fsinfo, |
| }; |
| |
| return rpc_call_sync(server->client, &msg, 0); |
| } |
| |
| static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo) |
| { |
| struct nfs4_exception exception = { }; |
| int err; |
| |
| do { |
| err = nfs4_handle_exception(server, |
| _nfs4_do_fsinfo(server, fhandle, fsinfo), |
| &exception); |
| } while (exception.retry); |
| return err; |
| } |
| |
| static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo) |
| { |
| nfs_fattr_init(fsinfo->fattr); |
| return nfs4_do_fsinfo(server, fhandle, fsinfo); |
| } |
| |
| static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle, |
| struct nfs_pathconf *pathconf) |
| { |
| struct nfs4_pathconf_arg args = { |
| .fh = fhandle, |
| .bitmask = server->attr_bitmask, |
| }; |
| struct rpc_message msg = { |
| .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF], |
| .rpc_argp = &args, |
| .rpc_resp = pathconf, |
| }; |
| |
| /* None of the pathconf attributes are mandatory to implement */ |
| if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) { |
| memset(pathconf, 0, sizeof(*pathconf)); |
| return 0; |
| } |
| |
| nfs_fattr_init(pathconf->fattr); |
| return rpc_call_sync(server->client, &msg, 0); |
| } |
| |
| static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle, |
| struct nfs_pathconf *pathconf) |
| { |
| struct nfs4_exception exception = { }; |
| int err; |
| |
| do { |
| err = nfs4_handle_exception(server, |
| _nfs4_proc_pathconf(server, fhandle, pathconf), |
| &exception); |
| } while (exception.retry); |
| return err; |
| } |
| |
| static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data) |
| { |
| struct nfs_server *server = NFS_SERVER(data->inode); |
| |
| if (nfs4_async_handle_error(task, server) == -EAGAIN) { |
| rpc_restart_call(task); |
| return -EAGAIN; |
| } |
| if (task->tk_status > 0) |
| renew_lease(server, data->timestamp); |
| return 0; |
| } |
| |
| static void nfs4_proc_read_setup(struct nfs_read_data *data) |
| { |
| struct rpc_message msg = { |
| .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ], |
| .rpc_argp = &data->args, |
| .rpc_resp = &data->res, |
| .rpc_cred = data->cred, |
| }; |
| |
| data->timestamp = jiffies; |
| |
| rpc_call_setup(&data->task, &msg, 0); |
| } |
| |
| static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data) |
| { |
| struct inode *inode = data->inode; |
| |
| if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) { |
| rpc_restart_call(task); |
| return -EAGAIN; |
| } |
| if (task->tk_status >= 0) { |
| renew_lease(NFS_SERVER(inode), data->timestamp); |
| nfs_post_op_update_inode(inode, data->res.fattr); |
| } |
| return 0; |
| } |
| |
| static void nfs4_proc_write_setup(struct nfs_write_data *data, int how) |
| { |
| struct rpc_message msg = { |
| .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE], |
| .rpc_argp = &data->args, |
| .rpc_resp = &data->res, |
| .rpc_cred = data->cred, |
| }; |
| struct inode *inode = data->inode; |
| struct nfs_server *server = NFS_SERVER(inode); |
| int stable; |
| |
| if (how & FLUSH_STABLE) { |
| if (!NFS_I(inode)->ncommit) |
| stable = NFS_FILE_SYNC; |
| else |
| stable = NFS_DATA_SYNC; |
| } else |
| stable = NFS_UNSTABLE; |
| data->args.stable = stable; |
| data->args.bitmask = server->attr_bitmask; |
| data->res.server = server; |
| |
| data->timestamp = jiffies; |
| |
| /* Finalize the task. */ |
| rpc_call_setup(&data->task, &msg, 0); |
| } |
| |
| static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data) |
| { |
| struct inode *inode = data->inode; |
| |
| if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) { |
| rpc_restart_call(task); |
| return -EAGAIN; |
| } |
| if (task->tk_status >= 0) |
| nfs_post_op_update_inode(inode, data->res.fattr); |
| return 0; |
| } |
| |
| static void nfs4_proc_commit_setup(struct nfs_write_data *data, int how) |
| { |
| struct rpc_message msg = { |
| .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT], |
| .rpc_argp = &data->args, |
| .rpc_resp = &data->res, |
| .rpc_cred = data->cred, |
| }; |
| struct nfs_server *server = NFS_SERVER(data->inode); |
| |
| data->args.bitmask = server->attr_bitmask; |
| data->res.server = server; |
| |
| rpc_call_setup(&data->task, &msg, 0); |
| } |
| |
| /* |
| * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special |
| * standalone procedure for queueing an asynchronous RENEW. |
| */ |
| static void nfs4_renew_done(struct rpc_task *task, void *data) |
| { |
| struct nfs_client *clp = (struct nfs_client *)task->tk_msg.rpc_argp; |
| unsigned long timestamp = (unsigned long)data; |
| |
| if (task->tk_status < 0) { |
| switch (task->tk_status) { |
| case -NFS4ERR_STALE_CLIENTID: |
| case -NFS4ERR_EXPIRED: |
| case -NFS4ERR_CB_PATH_DOWN: |
| nfs4_schedule_state_recovery(clp); |
| } |
| return; |
| } |
| spin_lock(&clp->cl_lock); |
| if (time_before(clp->cl_last_renewal,timestamp)) |
| clp->cl_last_renewal = timestamp; |
| spin_unlock(&clp->cl_lock); |
| } |
| |
| static const struct rpc_call_ops nfs4_renew_ops = { |
| .rpc_call_done = nfs4_renew_done, |
| }; |
| |
| int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred) |
| { |
| struct rpc_message msg = { |
| .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW], |
| .rpc_argp = clp, |
| .rpc_cred = cred, |
| }; |
| |
| return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT, |
| &nfs4_renew_ops, (void *)jiffies); |
| } |
| |
| int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred) |
| { |
| struct rpc_message msg = { |
| .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW], |
| .rpc_argp = clp, |
| .rpc_cred = cred, |
| }; |
| unsigned long now = jiffies; |
| int status; |
| |
| status = rpc_call_sync(clp->cl_rpcclient, &msg, 0); |
| if (status < 0) |
| return status; |
| spin_lock(&clp->cl_lock); |
| if (time_before(clp->cl_last_renewal,now)) |
| clp->cl_last_renewal = now; |
| spin_unlock(&clp->cl_lock); |
| return 0; |
| } |
| |
| static inline int nfs4_server_supports_acls(struct nfs_server *server) |
| { |
| return (server->caps & NFS_CAP_ACLS) |
| && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL) |
| && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL); |
| } |
| |
| /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that |
| * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on |
| * the stack. |
| */ |
| #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT) |
| |
| static void buf_to_pages(const void *buf, size_t buflen, |
| struct page **pages, unsigned int *pgbase) |
| { |
| const void *p = buf; |
| |
| *pgbase = offset_in_page(buf); |
| p -= *pgbase; |
| while (p < buf + buflen) { |
| *(pages++) = virt_to_page(p); |
| p += PAGE_CACHE_SIZE; |
| } |
| } |
| |
| struct nfs4_cached_acl { |
| int cached; |
| size_t len; |
| char data[0]; |
| }; |
| |
| static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl) |
| { |
| struct nfs_inode *nfsi = NFS_I(inode); |
| |
| spin_lock(&inode->i_lock); |
| kfree(nfsi->nfs4_acl); |
| nfsi->nfs4_acl = acl; |
| spin_unlock(&inode->i_lock); |
| } |
| |
| static void nfs4_zap_acl_attr(struct inode *inode) |
| { |
| nfs4_set_cached_acl(inode, NULL); |
| } |
| |
| static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen) |
| { |
| struct nfs_inode *nfsi = NFS_I(inode); |
| struct nfs4_cached_acl *acl; |
| int ret = -ENOENT; |
| |
| spin_lock(&inode->i_lock); |
| acl = nfsi->nfs4_acl; |
| if (acl == NULL) |
| goto out; |
| if (buf == NULL) /* user is just asking for length */ |
| goto out_len; |
| if (acl->cached == 0) |
| goto out; |
| ret = -ERANGE; /* see getxattr(2) man page */ |
| if (acl->len > buflen) |
| goto out; |
| memcpy(buf, acl->data, acl->len); |
| out_len: |
| ret = acl->len; |
| out: |
| spin_unlock(&inode->i_lock); |
| return ret; |
| } |
| |
| static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len) |
| { |
| struct nfs4_cached_acl *acl; |
| |
| if (buf && acl_len <= PAGE_SIZE) { |
| acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL); |
| if (acl == NULL) |
| goto out; |
| acl->cached = 1; |
| memcpy(acl->data, buf, acl_len); |
| } else { |
| acl = kmalloc(sizeof(*acl), GFP_KERNEL); |
| if (acl == NULL) |
| goto out; |
| acl->cached = 0; |
| } |
| acl->len = acl_len; |
| out: |
| nfs4_set_cached_acl(inode, acl); |
| } |
| |
| static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen) |
| { |
| struct page *pages[NFS4ACL_MAXPAGES]; |
| struct nfs_getaclargs args = { |
| .fh = NFS_FH(inode), |
| .acl_pages = pages, |
| .acl_len = buflen, |
| }; |
| size_t resp_len = buflen; |
| void *resp_buf; |
| struct rpc_message msg = { |
| .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL], |
| .rpc_argp = &args, |
| .rpc_resp = &resp_len, |
| }; |
| struct page *localpage = NULL; |
| int ret; |
| |
| if (buflen < PAGE_SIZE) { |
| /* As long as we're doing a round trip to the server anyway, |
| * let's be prepared for a page of acl data. */ |
| localpage = alloc_page(GFP_KERNEL); |
| resp_buf = page_address(localpage); |
| if (localpage == NULL) |
| return -ENOMEM; |
| args.acl_pages[0] = localpage; |
| args.acl_pgbase = 0; |
| resp_len = args.acl_len = PAGE_SIZE; |
| } else { |
| resp_buf = buf; |
| buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase); |
| } |
| ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0); |
| if (ret) |
| goto out_free; |
| if (resp_len > args.acl_len) |
| nfs4_write_cached_acl(inode, NULL, resp_len); |
| else |
| nfs4_write_cached_acl(inode, resp_buf, resp_len); |
| if (buf) { |
| ret = -ERANGE; |
| if (resp_len > buflen) |
| goto out_free; |
| if (localpage) |
| memcpy(buf, resp_buf, resp_len); |
| } |
| ret = resp_len; |
| out_free: |
| if (localpage) |
| __free_page(localpage); |
| return ret; |
| } |
| |
| static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen) |
| { |
| struct nfs4_exception exception = { }; |
| ssize_t ret; |
| do { |
| ret = __nfs4_get_acl_uncached(inode, buf, buflen); |
| if (ret >= 0) |
| break; |
| ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception); |
| } while (exception.retry); |
| return ret; |
| } |
| |
| static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen) |
| { |
| struct nfs_server *server = NFS_SERVER(inode); |
| int ret; |
| |
| if (!nfs4_server_supports_acls(server)) |
| return -EOPNOTSUPP; |
| ret = nfs_revalidate_inode(server, inode); |
| if (ret < 0) |
| return ret; |
| ret = nfs4_read_cached_acl(inode, buf, buflen); |
| if (ret != -ENOENT) |
| return ret; |
| return nfs4_get_acl_uncached(inode, buf, buflen); |
| } |
| |
| static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen) |
| { |
| struct nfs_server *server = NFS_SERVER(inode); |
| struct page *pages[NFS4ACL_MAXPAGES]; |
| struct nfs_setaclargs arg = { |
| .fh = NFS_FH(inode), |
| .acl_pages = pages, |
| .acl_len = buflen, |
| }; |
| struct rpc_message msg = { |
| .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETACL], |
| .rpc_argp = &arg, |
| .rpc_resp = NULL, |
| }; |
| int ret; |
| |
| if (!nfs4_server_supports_acls(server)) |
| return -EOPNOTSUPP; |
| nfs_inode_return_delegation(inode); |
| buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase); |
| ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0); |
| if (ret == 0) |
| nfs4_write_cached_acl(inode, buf, buflen); |
| return ret; |
| } |
| |
| static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen) |
| { |
| struct nfs4_exception exception = { }; |
| int err; |
| do { |
| err = nfs4_handle_exception(NFS_SERVER(inode), |
| __nfs4_proc_set_acl(inode, buf, buflen), |
| &exception); |
| } while (exception.retry); |
| return err; |
| } |
| |
| static int |
| nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server) |
| { |
| struct nfs_client *clp = server->nfs_client; |
| |
| if (!clp || task->tk_status >= 0) |
| return 0; |
| switch(task->tk_status) { |
| case -NFS4ERR_STALE_CLIENTID: |
| case -NFS4ERR_STALE_STATEID: |
| case -NFS4ERR_EXPIRED: |
| rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL, NULL); |
| nfs4_schedule_state_recovery(clp); |
| if (test_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state) == 0) |
| rpc_wake_up_task(task); |
| task->tk_status = 0; |
| return -EAGAIN; |
| case -NFS4ERR_DELAY: |
| nfs_inc_server_stats((struct nfs_server *) server, |
| NFSIOS_DELAY); |
| case -NFS4ERR_GRACE: |
| rpc_delay(task, NFS4_POLL_RETRY_MAX); |
| task->tk_status = 0; |
| return -EAGAIN; |
| case -NFS4ERR_OLD_STATEID: |
| task->tk_status = 0; |
| return -EAGAIN; |
| } |
| task->tk_status = nfs4_map_errors(task->tk_status); |
| return 0; |
| } |
| |
| static int nfs4_wait_bit_interruptible(void *word) |
| { |
| if (signal_pending(current)) |
| return -ERESTARTSYS; |
| schedule(); |
| return 0; |
| } |
| |
| static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp) |
| { |
| sigset_t oldset; |
| int res; |
| |
| might_sleep(); |
| |
| rwsem_acquire(&clp->cl_sem.dep_map, 0, 0, _RET_IP_); |
| |
| rpc_clnt_sigmask(clnt, &oldset); |
| res = wait_on_bit(&clp->cl_state, NFS4CLNT_STATE_RECOVER, |
| nfs4_wait_bit_interruptible, |
| TASK_INTERRUPTIBLE); |
| rpc_clnt_sigunmask(clnt, &oldset); |
| |
| rwsem_release(&clp->cl_sem.dep_map, 1, _RET_IP_); |
| return res; |
| } |
| |
| static int nfs4_delay(struct rpc_clnt *clnt, long *timeout) |
| { |
| sigset_t oldset; |
| int res = 0; |
| |
| might_sleep(); |
| |
| if (*timeout <= 0) |
| *timeout = NFS4_POLL_RETRY_MIN; |
| if (*timeout > NFS4_POLL_RETRY_MAX) |
| *timeout = NFS4_POLL_RETRY_MAX; |
| rpc_clnt_sigmask(clnt, &oldset); |
| if (clnt->cl_intr) { |
| schedule_timeout_interruptible(*timeout); |
| if (signalled()) |
| res = -ERESTARTSYS; |
| } else |
| schedule_timeout_uninterruptible(*timeout); |
| rpc_clnt_sigunmask(clnt, &oldset); |
| *timeout <<= 1; |
| return res; |
| } |
| |
| /* This is the error handling routine for processes that are allowed |
| * to sleep. |
| */ |
| int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception) |
| { |
| struct nfs_client *clp = server->nfs_client; |
| int ret = errorcode; |
| |
| exception->retry = 0; |
| switch(errorcode) { |
| case 0: |
| return 0; |
| case -NFS4ERR_STALE_CLIENTID: |
| case -NFS4ERR_STALE_STATEID: |
| case -NFS4ERR_EXPIRED: |
| nfs4_schedule_state_recovery(clp); |
| ret = nfs4_wait_clnt_recover(server->client, clp); |
| if (ret == 0) |
| exception->retry = 1; |
| break; |
| case -NFS4ERR_FILE_OPEN: |
| case -NFS4ERR_GRACE: |
| case -NFS4ERR_DELAY: |
| ret = nfs4_delay(server->client, &exception->timeout); |
| if (ret != 0) |
| break; |
| case -NFS4ERR_OLD_STATEID: |
| exception->retry = 1; |
| } |
| /* We failed to handle the error */ |
| return nfs4_map_errors(ret); |
| } |
| |
| int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, unsigned short port, struct rpc_cred *cred) |
| { |
| nfs4_verifier sc_verifier; |
| struct nfs4_setclientid setclientid = { |
| .sc_verifier = &sc_verifier, |
| .sc_prog = program, |
| }; |
| struct rpc_message msg = { |
| .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID], |
| .rpc_argp = &setclientid, |
| .rpc_resp = clp, |
| .rpc_cred = cred, |
| }; |
| __be32 *p; |
| int loop = 0; |
| int status; |
| |
| p = (__be32*)sc_verifier.data; |
| *p++ = htonl((u32)clp->cl_boot_time.tv_sec); |
| *p = htonl((u32)clp->cl_boot_time.tv_nsec); |
| |
| for(;;) { |
| setclientid.sc_name_len = scnprintf(setclientid.sc_name, |
| sizeof(setclientid.sc_name), "%s/%u.%u.%u.%u %s %u", |
| clp->cl_ipaddr, NIPQUAD(clp->cl_addr.sin_addr), |
| cred->cr_ops->cr_name, |
| clp->cl_id_uniquifier); |
| setclientid.sc_netid_len = scnprintf(setclientid.sc_netid, |
| sizeof(setclientid.sc_netid), "tcp"); |
| setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr, |
| sizeof(setclientid.sc_uaddr), "%s.%d.%d", |
| clp->cl_ipaddr, port >> 8, port & 255); |
| |
| status = rpc_call_sync(clp->cl_rpcclient, &msg, 0); |
| if (status != -NFS4ERR_CLID_INUSE) |
| break; |
| if (signalled()) |
| break; |
| if (loop++ & 1) |
| ssleep(clp->cl_lease_time + 1); |
| else |
| if (++clp->cl_id_uniquifier == 0) |
| break; |
| } |
| return status; |
| } |
| |
| static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred) |
| { |
| struct nfs_fsinfo fsinfo; |
| struct rpc_message msg = { |
| .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM], |
| .rpc_argp = clp, |
| .rpc_resp = &fsinfo, |
| .rpc_cred = cred, |
| }; |
| unsigned long now; |
| int status; |
| |
| now = jiffies; |
| status = rpc_call_sync(clp->cl_rpcclient, &msg, 0); |
| if (status == 0) { |
| spin_lock(&clp->cl_lock); |
| clp->cl_lease_time = fsinfo.lease_time * HZ; |
| clp->cl_last_renewal = now; |
| clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); |
| spin_unlock(&clp->cl_lock); |
| } |
| return status; |
| } |
| |
| int nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred) |
| { |
| long timeout; |
| int err; |
| do { |
| err = _nfs4_proc_setclientid_confirm(clp, cred); |
| switch (err) { |
| case 0: |
| return err; |
| case -NFS4ERR_RESOURCE: |
| /* The IBM lawyers misread another document! */ |
| case -NFS4ERR_DELAY: |
| err = nfs4_delay(clp->cl_rpcclient, &timeout); |
| } |
| } while (err == 0); |
| return err; |
| } |
| |
| struct nfs4_delegreturndata { |
| struct nfs4_delegreturnargs args; |
| struct nfs4_delegreturnres res; |
| struct nfs_fh fh; |
| nfs4_stateid stateid; |
| struct rpc_cred *cred; |
| unsigned long timestamp; |
| struct nfs_fattr fattr; |
| int rpc_status; |
| }; |
| |
| static void nfs4_delegreturn_prepare(struct rpc_task *task, void *calldata) |
| { |
| struct nfs4_delegreturndata *data = calldata; |
| struct rpc_message msg = { |
| .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN], |
| .rpc_argp = &data->args, |
| .rpc_resp = &data->res, |
| .rpc_cred = data->cred, |
| }; |
| nfs_fattr_init(data->res.fattr); |
| rpc_call_setup(task, &msg, 0); |
| } |
| |
| static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata) |
| { |
| struct nfs4_delegreturndata *data = calldata; |
| data->rpc_status = task->tk_status; |
| if (data->rpc_status == 0) |
| renew_lease(data->res.server, data->timestamp); |
| } |
| |
| static void nfs4_delegreturn_release(void *calldata) |
| { |
| struct nfs4_delegreturndata *data = calldata; |
| |
| put_rpccred(data->cred); |
| kfree(calldata); |
| } |
| |
| static const struct rpc_call_ops nfs4_delegreturn_ops = { |
| .rpc_call_prepare = nfs4_delegreturn_prepare, |
| .rpc_call_done = nfs4_delegreturn_done, |
| .rpc_release = nfs4_delegreturn_release, |
| }; |
| |
| static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid) |
| { |
| struct nfs4_delegreturndata *data; |
| struct nfs_server *server = NFS_SERVER(inode); |
| struct rpc_task *task; |
| int status; |
| |
| data = kmalloc(sizeof(*data), GFP_KERNEL); |
| if (data == NULL) |
| return -ENOMEM; |
| data->args.fhandle = &data->fh; |
| data->args.stateid = &data->stateid; |
| data->args.bitmask = server->attr_bitmask; |
| nfs_copy_fh(&data->fh, NFS_FH(inode)); |
| memcpy(&data->stateid, stateid, sizeof(data->stateid)); |
| data->res.fattr = &data->fattr; |
| data->res.server = server; |
| data->cred = get_rpccred(cred); |
| data->timestamp = jiffies; |
| data->rpc_status = 0; |
| |
| task = rpc_run_task(NFS_CLIENT(inode), RPC_TASK_ASYNC, &nfs4_delegreturn_ops, data); |
| if (IS_ERR(task)) |
| return PTR_ERR(task); |
| status = nfs4_wait_for_completion_rpc_task(task); |
| if (status == 0) { |
| status = data->rpc_status; |
| if (status == 0) |
| nfs_post_op_update_inode(inode, &data->fattr); |
| } |
| rpc_put_task(task); |
| return status; |
| } |
| |
| int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid) |
| { |
| struct nfs_server *server = NFS_SERVER(inode); |
| struct nfs4_exception exception = { }; |
| int err; |
| do { |
| err = _nfs4_proc_delegreturn(inode, cred, stateid); |
| switch (err) { |
| case -NFS4ERR_STALE_STATEID: |
| case -NFS4ERR_EXPIRED: |
| case 0: |
| return 0; |
| } |
| err = nfs4_handle_exception(server, err, &exception); |
| } while (exception.retry); |
| return err; |
| } |
| |
| #define NFS4_LOCK_MINTIMEOUT (1 * HZ) |
| #define NFS4_LOCK_MAXTIMEOUT (30 * HZ) |
| |
| /* |
| * sleep, with exponential backoff, and retry the LOCK operation. |
| */ |
| static unsigned long |
| nfs4_set_lock_task_retry(unsigned long timeout) |
| { |
| schedule_timeout_interruptible(timeout); |
| timeout <<= 1; |
| if (timeout > NFS4_LOCK_MAXTIMEOUT) |
| return NFS4_LOCK_MAXTIMEOUT; |
| return timeout; |
| } |
| |
| static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request) |
| { |
| struct inode *inode = state->inode; |
| struct nfs_server *server = NFS_SERVER(inode); |
| struct nfs_client *clp = server->nfs_client; |
| struct nfs_lockt_args arg = { |
| .fh = NFS_FH(inode), |
| .fl = request, |
| }; |
| struct nfs_lockt_res res = { |
| .denied = request, |
| }; |
| struct rpc_message msg = { |
| .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT], |
| .rpc_argp = &arg, |
| .rpc_resp = &res, |
| .rpc_cred = state->owner->so_cred, |
| }; |
| struct nfs4_lock_state *lsp; |
| int status; |
| |
| down_read(&clp->cl_sem); |
| arg.lock_owner.clientid = clp->cl_clientid; |
| status = nfs4_set_lock_state(state, request); |
| if (status != 0) |
| goto out; |
| lsp = request->fl_u.nfs4_fl.owner; |
| arg.lock_owner.id = lsp->ls_id; |
| status = rpc_call_sync(server->client, &msg, 0); |
| switch (status) { |
| case 0: |
| request->fl_type = F_UNLCK; |
| break; |
| case -NFS4ERR_DENIED: |
| status = 0; |
| } |
| out: |
| up_read(&clp->cl_sem); |
| return status; |
| } |
| |
| static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request) |
| { |
| struct nfs4_exception exception = { }; |
| int err; |
| |
| do { |
| err = nfs4_handle_exception(NFS_SERVER(state->inode), |
| _nfs4_proc_getlk(state, cmd, request), |
| &exception); |
| } while (exception.retry); |
| return err; |
| } |
| |
| static int do_vfs_lock(struct file *file, struct file_lock *fl) |
| { |
| int res = 0; |
| switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) { |
| case FL_POSIX: |
| res = posix_lock_file_wait(file, fl); |
| break; |
| case FL_FLOCK: |
| res = flock_lock_file_wait(file, fl); |
| break; |
| default: |
| BUG(); |
| } |
| return res; |
| } |
| |
| struct nfs4_unlockdata { |
| struct nfs_locku_args arg; |
| struct nfs_locku_res res; |
| struct nfs4_lock_state *lsp; |
| struct nfs_open_context *ctx; |
| struct file_lock fl; |
| const struct nfs_server *server; |
| unsigned long timestamp; |
| }; |
| |
| static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl, |
| struct nfs_open_context *ctx, |
| struct nfs4_lock_state *lsp, |
| struct nfs_seqid *seqid) |
| { |
| struct nfs4_unlockdata *p; |
| struct inode *inode = lsp->ls_state->inode; |
| |
| p = kmalloc(sizeof(*p), GFP_KERNEL); |
| if (p == NULL) |
| return NULL; |
| p->arg.fh = NFS_FH(inode); |
| p->arg.fl = &p->fl; |
| p->arg.seqid = seqid; |
| p->arg.stateid = &lsp->ls_stateid; |
| p->lsp = lsp; |
| atomic_inc(&lsp->ls_count); |
| /* Ensure we don't close file until we're done freeing locks! */ |
| p->ctx = get_nfs_open_context(ctx); |
| memcpy(&p->fl, fl, sizeof(p->fl)); |
| p->server = NFS_SERVER(inode); |
| return p; |
| } |
| |
| static void nfs4_locku_release_calldata(void *data) |
| { |
| struct nfs4_unlockdata *calldata = data; |
| nfs_free_seqid(calldata->arg.seqid); |
| nfs4_put_lock_state(calldata->lsp); |
| put_nfs_open_context(calldata->ctx); |
| kfree(calldata); |
| } |
| |
| static void nfs4_locku_done(struct rpc_task *task, void *data) |
| { |
| struct nfs4_unlockdata *calldata = data; |
| |
| if (RPC_ASSASSINATED(task)) |
| return; |
| nfs_increment_lock_seqid(task->tk_status, calldata->arg.seqid); |
| switch (task->tk_status) { |
| case 0: |
| memcpy(calldata->lsp->ls_stateid.data, |
| calldata->res.stateid.data, |
| sizeof(calldata->lsp->ls_stateid.data)); |
| renew_lease(calldata->server, calldata->timestamp); |
| break; |
| case -NFS4ERR_STALE_STATEID: |
| case -NFS4ERR_EXPIRED: |
| break; |
| default: |
| if (nfs4_async_handle_error(task, calldata->server) == -EAGAIN) |
| rpc_restart_call(task); |
| } |
| } |
| |
| static void nfs4_locku_prepare(struct rpc_task *task, void *data) |
| { |
| struct nfs4_unlockdata *calldata = data; |
| struct rpc_message msg = { |
| .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU], |
| .rpc_argp = &calldata->arg, |
| .rpc_resp = &calldata->res, |
| .rpc_cred = calldata->lsp->ls_state->owner->so_cred, |
| }; |
| |
| if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0) |
| return; |
| if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) { |
| /* Note: exit _without_ running nfs4_locku_done */ |
| task->tk_action = NULL; |
| return; |
| } |
| calldata->timestamp = jiffies; |
| rpc_call_setup(task, &msg, 0); |
| } |
| |
| static const struct rpc_call_ops nfs4_locku_ops = { |
| .rpc_call_prepare = nfs4_locku_prepare, |
| .rpc_call_done = nfs4_locku_done, |
| .rpc_release = nfs4_locku_release_calldata, |
| }; |
| |
| static struct rpc_task *nfs4_do_unlck(struct file_lock *fl, |
| struct nfs_open_context *ctx, |
| struct nfs4_lock_state *lsp, |
| struct nfs_seqid *seqid) |
| { |
| struct nfs4_unlockdata *data; |
| |
| data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid); |
| if (data == NULL) { |
| nfs_free_seqid(seqid); |
| return ERR_PTR(-ENOMEM); |
| } |
| |
| return rpc_run_task(NFS_CLIENT(lsp->ls_state->inode), RPC_TASK_ASYNC, &nfs4_locku_ops, data); |
| } |
| |
| static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request) |
| { |
| struct nfs_seqid *seqid; |
| struct nfs4_lock_state *lsp; |
| struct rpc_task *task; |
| int status = 0; |
| |
| status = nfs4_set_lock_state(state, request); |
| /* Unlock _before_ we do the RPC call */ |
| request->fl_flags |= FL_EXISTS; |
| if (do_vfs_lock(request->fl_file, request) == -ENOENT) |
| goto out; |
| if (status != 0) |
| goto out; |
| /* Is this a delegated lock? */ |
| if (test_bit(NFS_DELEGATED_STATE, &state->flags)) |
| goto out; |
| lsp = request->fl_u.nfs4_fl.owner; |
| seqid = nfs_alloc_seqid(&lsp->ls_seqid); |
| status = -ENOMEM; |
| if (seqid == NULL) |
| goto out; |
| task = nfs4_do_unlck(request, request->fl_file->private_data, lsp, seqid); |
| status = PTR_ERR(task); |
| if (IS_ERR(task)) |
| goto out; |
| status = nfs4_wait_for_completion_rpc_task(task); |
| rpc_put_task(task); |
| out: |
| return status; |
| } |
| |
| struct nfs4_lockdata { |
| struct nfs_lock_args arg; |
| struct nfs_lock_res res; |
| struct nfs4_lock_state *lsp; |
| struct nfs_open_context *ctx; |
| struct file_lock fl; |
| unsigned long timestamp; |
| int rpc_status; |
| int cancelled; |
| }; |
| |
| static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl, |
| struct nfs_open_context *ctx, struct nfs4_lock_state *lsp) |
| { |
| struct nfs4_lockdata *p; |
| struct inode *inode = lsp->ls_state->inode; |
| struct nfs_server *server = NFS_SERVER(inode); |
| |
| p = kzalloc(sizeof(*p), GFP_KERNEL); |
| if (p == NULL) |
| return NULL; |
| |
| p->arg.fh = NFS_FH(inode); |
| p->arg.fl = &p->fl; |
| p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid); |
| if (p->arg.lock_seqid == NULL) |
| goto out_free; |
| p->arg.lock_stateid = &lsp->ls_stateid; |
| p->arg.lock_owner.clientid = server->nfs_client->cl_clientid; |
| p->arg.lock_owner.id = lsp->ls_id; |
| p->lsp = lsp; |
| atomic_inc(&lsp->ls_count); |
| p->ctx = get_nfs_open_context(ctx); |
| memcpy(&p->fl, fl, sizeof(p->fl)); |
| return p; |
| out_free: |
| kfree(p); |
| return NULL; |
| } |
| |
| static void nfs4_lock_prepare(struct rpc_task *task, void *calldata) |
| { |
| struct nfs4_lockdata *data = calldata; |
| struct nfs4_state *state = data->lsp->ls_state; |
| struct nfs4_state_owner *sp = state->owner; |
| struct rpc_message msg = { |
| .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK], |
| .rpc_argp = &data->arg, |
| .rpc_resp = &data->res, |
| .rpc_cred = sp->so_cred, |
| }; |
| |
| if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0) |
| return; |
| dprintk("%s: begin!\n", __FUNCTION__); |
| /* Do we need to do an open_to_lock_owner? */ |
| if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) { |
| data->arg.open_seqid = nfs_alloc_seqid(&sp->so_seqid); |
| if (data->arg.open_seqid == NULL) { |
| data->rpc_status = -ENOMEM; |
| task->tk_action = NULL; |
| goto out; |
| } |
| data->arg.open_stateid = &state->stateid; |
| data->arg.new_lock_owner = 1; |
| } |
| data->timestamp = jiffies; |
| rpc_call_setup(task, &msg, 0); |
| out: |
| dprintk("%s: done!, ret = %d\n", __FUNCTION__, data->rpc_status); |
| } |
| |
| static void nfs4_lock_done(struct rpc_task *task, void *calldata) |
| { |
| struct nfs4_lockdata *data = calldata; |
| |
| dprintk("%s: begin!\n", __FUNCTION__); |
| |
| data->rpc_status = task->tk_status; |
| if (RPC_ASSASSINATED(task)) |
| goto out; |
| if (data->arg.new_lock_owner != 0) { |
| nfs_increment_open_seqid(data->rpc_status, data->arg.open_seqid); |
| if (data->rpc_status == 0) |
| nfs_confirm_seqid(&data->lsp->ls_seqid, 0); |
| else |
| goto out; |
| } |
| if (data->rpc_status == 0) { |
| memcpy(data->lsp->ls_stateid.data, data->res.stateid.data, |
| sizeof(data->lsp->ls_stateid.data)); |
| data->lsp->ls_flags |= NFS_LOCK_INITIALIZED; |
| renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp); |
| } |
| nfs_increment_lock_seqid(data->rpc_status, data->arg.lock_seqid); |
| out: |
| dprintk("%s: done, ret = %d!\n", __FUNCTION__, data->rpc_status); |
| } |
| |
| static void nfs4_lock_release(void *calldata) |
| { |
| struct nfs4_lockdata *data = calldata; |
| |
| dprintk("%s: begin!\n", __FUNCTION__); |
| if (data->arg.open_seqid != NULL) |
| nfs_free_seqid(data->arg.open_seqid); |
| if (data->cancelled != 0) { |
| struct rpc_task *task; |
| task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp, |
| data->arg.lock_seqid); |
| if (!IS_ERR(task)) |
| rpc_put_task(task); |
| dprintk("%s: cancelling lock!\n", __FUNCTION__); |
| } else |
| nfs_free_seqid(data->arg.lock_seqid); |
| nfs4_put_lock_state(data->lsp); |
| put_nfs_open_context(data->ctx); |
| kfree(data); |
| dprintk("%s: done!\n", __FUNCTION__); |
| } |
| |
| static const struct rpc_call_ops nfs4_lock_ops = { |
| .rpc_call_prepare = nfs4_lock_prepare, |
| .rpc_call_done = nfs4_lock_done, |
| .rpc_release = nfs4_lock_release, |
| }; |
| |
| static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int reclaim) |
| { |
| struct nfs4_lockdata *data; |
| struct rpc_task *task; |
| int ret; |
| |
| dprintk("%s: begin!\n", __FUNCTION__); |
| data = nfs4_alloc_lockdata(fl, fl->fl_file->private_data, |
| fl->fl_u.nfs4_fl.owner); |
| if (data == NULL) |
| return -ENOMEM; |
| if (IS_SETLKW(cmd)) |
| data->arg.block = 1; |
| if (reclaim != 0) |
| data->arg.reclaim = 1; |
| task = rpc_run_task(NFS_CLIENT(state->inode), RPC_TASK_ASYNC, |
| &nfs4_lock_ops, data); |
| if (IS_ERR(task)) |
| return PTR_ERR(task); |
| ret = nfs4_wait_for_completion_rpc_task(task); |
| if (ret == 0) { |
| ret = data->rpc_status; |
| if (ret == -NFS4ERR_DENIED) |
| ret = -EAGAIN; |
| } else |
| data->cancelled = 1; |
| rpc_put_task(task); |
| dprintk("%s: done, ret = %d!\n", __FUNCTION__, ret); |
| return ret; |
| } |
| |
| static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request) |
| { |
| struct nfs_server *server = NFS_SERVER(state->inode); |
| struct nfs4_exception exception = { }; |
| int err; |
| |
| do { |
| /* Cache the lock if possible... */ |
| if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0) |
| return 0; |
| err = _nfs4_do_setlk(state, F_SETLK, request, 1); |
| if (err != -NFS4ERR_DELAY) |
| break; |
| nfs4_handle_exception(server, err, &exception); |
| } while (exception.retry); |
| return err; |
| } |
| |
| static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request) |
| { |
| struct nfs_server *server = NFS_SERVER(state->inode); |
| struct nfs4_exception exception = { }; |
| int err; |
| |
| err = nfs4_set_lock_state(state, request); |
| if (err != 0) |
| return err; |
| do { |
| if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0) |
| return 0; |
| err = _nfs4_do_setlk(state, F_SETLK, request, 0); |
| if (err != -NFS4ERR_DELAY) |
| break; |
| nfs4_handle_exception(server, err, &exception); |
| } while (exception.retry); |
| return err; |
| } |
| |
| static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) |
| { |
| struct nfs_client *clp = state->owner->so_client; |
| unsigned char fl_flags = request->fl_flags; |
| int status; |
| |
| /* Is this a delegated open? */ |
| status = nfs4_set_lock_state(state, request); |
| if (status != 0) |
| goto out; |
| request->fl_flags |= FL_ACCESS; |
| status = do_vfs_lock(request->fl_file, request); |
| if (status < 0) |
| goto out; |
| down_read(&clp->cl_sem); |
| if (test_bit(NFS_DELEGATED_STATE, &state->flags)) { |
| struct nfs_inode *nfsi = NFS_I(state->inode); |
| /* Yes: cache locks! */ |
| down_read(&nfsi->rwsem); |
| /* ...but avoid races with delegation recall... */ |
| if (test_bit(NFS_DELEGATED_STATE, &state->flags)) { |
| request->fl_flags = fl_flags & ~FL_SLEEP; |
| status = do_vfs_lock(request->fl_file, request); |
| up_read(&nfsi->rwsem); |
| goto out_unlock; |
| } |
| up_read(&nfsi->rwsem); |
| } |
| status = _nfs4_do_setlk(state, cmd, request, 0); |
| if (status != 0) |
| goto out_unlock; |
| /* Note: we always want to sleep here! */ |
| request->fl_flags = fl_flags | FL_SLEEP; |
| if (do_vfs_lock(request->fl_file, request) < 0) |
| printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __FUNCTION__); |
| out_unlock: |
| up_read(&clp->cl_sem); |
| out: |
| request->fl_flags = fl_flags; |
| return status; |
| } |
| |
| static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) |
| { |
| struct nfs4_exception exception = { }; |
| int err; |
| |
| do { |
| err = nfs4_handle_exception(NFS_SERVER(state->inode), |
| _nfs4_proc_setlk(state, cmd, request), |
| &exception); |
| } while (exception.retry); |
| return err; |
| } |
| |
| static int |
| nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request) |
| { |
| struct nfs_open_context *ctx; |
| struct nfs4_state *state; |
| unsigned long timeout = NFS4_LOCK_MINTIMEOUT; |
| int status; |
| |
| /* verify open state */ |
| ctx = (struct nfs_open_context *)filp->private_data; |
| state = ctx->state; |
| |
| if (request->fl_start < 0 || request->fl_end < 0) |
| return -EINVAL; |
| |
| if (IS_GETLK(cmd)) |
| return nfs4_proc_getlk(state, F_GETLK, request); |
| |
| if (!(IS_SETLK(cmd) || IS_SETLKW(cmd))) |
| return -EINVAL; |
| |
| if (request->fl_type == F_UNLCK) |
| return nfs4_proc_unlck(state, cmd, request); |
| |
| do { |
| status = nfs4_proc_setlk(state, cmd, request); |
| if ((status != -EAGAIN) || IS_SETLK(cmd)) |
| break; |
| timeout = nfs4_set_lock_task_retry(timeout); |
| status = -ERESTARTSYS; |
| if (signalled()) |
| break; |
| } while(status < 0); |
| return status; |
| } |
| |
| int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl) |
| { |
| struct nfs_server *server = NFS_SERVER(state->inode); |
| struct nfs4_exception exception = { }; |
| int err; |
| |
| err = nfs4_set_lock_state(state, fl); |
| if (err != 0) |
| goto out; |
| do { |
| err = _nfs4_do_setlk(state, F_SETLK, fl, 0); |
| if (err != -NFS4ERR_DELAY) |
| break; |
| err = nfs4_handle_exception(server, err, &exception); |
| } while (exception.retry); |
| out: |
| return err; |
| } |
| |
| #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl" |
| |
| int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf, |
| size_t buflen, int flags) |
| { |
| struct inode *inode = dentry->d_inode; |
| |
| if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0) |
| return -EOPNOTSUPP; |
| |
| if (!S_ISREG(inode->i_mode) && |
| (!S_ISDIR(inode->i_mode) || inode->i_mode & S_ISVTX)) |
| return -EPERM; |
| |
| return nfs4_proc_set_acl(inode, buf, buflen); |
| } |
| |
| /* The getxattr man page suggests returning -ENODATA for unknown attributes, |
| * and that's what we'll do for e.g. user attributes that haven't been set. |
| * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported |
| * attributes in kernel-managed attribute namespaces. */ |
| ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf, |
| size_t buflen) |
| { |
| struct inode *inode = dentry->d_inode; |
| |
| if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0) |
| return -EOPNOTSUPP; |
| |
| return nfs4_proc_get_acl(inode, buf, buflen); |
| } |
| |
| ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen) |
| { |
| size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1; |
| |
| if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode))) |
| return 0; |
| if (buf && buflen < len) |
| return -ERANGE; |
| if (buf) |
| memcpy(buf, XATTR_NAME_NFSV4_ACL, len); |
| return len; |
| } |
| |
| int nfs4_proc_fs_locations(struct inode *dir, struct qstr *name, |
| struct nfs4_fs_locations *fs_locations, struct page *page) |
| { |
| struct nfs_server *server = NFS_SERVER(dir); |
| u32 bitmask[2] = { |
| [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS, |
| [1] = FATTR4_WORD1_MOUNTED_ON_FILEID, |
| }; |
| struct nfs4_fs_locations_arg args = { |
| .dir_fh = NFS_FH(dir), |
| .name = name, |
| .page = page, |
| .bitmask = bitmask, |
| }; |
| struct rpc_message msg = { |
| .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS], |
| .rpc_argp = &args, |
| .rpc_resp = fs_locations, |
| }; |
| int status; |
| |
| dprintk("%s: start\n", __FUNCTION__); |
| nfs_fattr_init(&fs_locations->fattr); |
| fs_locations->server = server; |
| fs_locations->nlocations = 0; |
| status = rpc_call_sync(server->client, &msg, 0); |
| dprintk("%s: returned status = %d\n", __FUNCTION__, status); |
| return status; |
| } |
| |
| struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = { |
| .recover_open = nfs4_open_reclaim, |
| .recover_lock = nfs4_lock_reclaim, |
| }; |
| |
| struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops = { |
| .recover_open = nfs4_open_expired, |
| .recover_lock = nfs4_lock_expired, |
| }; |
| |
| static struct inode_operations nfs4_file_inode_operations = { |
| .permission = nfs_permission, |
| .getattr = nfs_getattr, |
| .setattr = nfs_setattr, |
| .getxattr = nfs4_getxattr, |
| .setxattr = nfs4_setxattr, |
| .listxattr = nfs4_listxattr, |
| }; |
| |
| const struct nfs_rpc_ops nfs_v4_clientops = { |
| .version = 4, /* protocol version */ |
| .dentry_ops = &nfs4_dentry_operations, |
| .dir_inode_ops = &nfs4_dir_inode_operations, |
| .file_inode_ops = &nfs4_file_inode_operations, |
| .getroot = nfs4_proc_get_root, |
| .getattr = nfs4_proc_getattr, |
| .setattr = nfs4_proc_setattr, |
| .lookupfh = nfs4_proc_lookupfh, |
| .lookup = nfs4_proc_lookup, |
| .access = nfs4_proc_access, |
| .readlink = nfs4_proc_readlink, |
| .create = nfs4_proc_create, |
| .remove = nfs4_proc_remove, |
| .unlink_setup = nfs4_proc_unlink_setup, |
| .unlink_done = nfs4_proc_unlink_done, |
| .rename = nfs4_proc_rename, |
| .link = nfs4_proc_link, |
| .symlink = nfs4_proc_symlink, |
| .mkdir = nfs4_proc_mkdir, |
| .rmdir = nfs4_proc_remove, |
| .readdir = nfs4_proc_readdir, |
| .mknod = nfs4_proc_mknod, |
| .statfs = nfs4_proc_statfs, |
| .fsinfo = nfs4_proc_fsinfo, |
| .pathconf = nfs4_proc_pathconf, |
| .set_capabilities = nfs4_server_capabilities, |
| .decode_dirent = nfs4_decode_dirent, |
| .read_setup = nfs4_proc_read_setup, |
| .read_done = nfs4_read_done, |
| .write_setup = nfs4_proc_write_setup, |
| .write_done = nfs4_write_done, |
| .commit_setup = nfs4_proc_commit_setup, |
| .commit_done = nfs4_commit_done, |
| .file_open = nfs_open, |
| .file_release = nfs_release, |
| .lock = nfs4_proc_lock, |
| .clear_acl_cache = nfs4_zap_acl_attr, |
| }; |
| |
| /* |
| * Local variables: |
| * c-basic-offset: 8 |
| * End: |
| */ |