| /* |
| * Module for the pnfs nfs4 file layout driver. |
| * Defines all I/O and Policy interface operations, plus code |
| * to register itself with the pNFS client. |
| * |
| * Copyright (c) 2002 |
| * The Regents of the University of Michigan |
| * All Rights Reserved |
| * |
| * Dean Hildebrand <dhildebz@umich.edu> |
| * |
| * Permission is granted to use, copy, create derivative works, and |
| * redistribute this software and such derivative works for any purpose, |
| * so long as the name of the University of Michigan is not used in |
| * any advertising or publicity pertaining to the use or distribution |
| * of this software without specific, written prior authorization. If |
| * the above copyright notice or any other identification of the |
| * University of Michigan is included in any copy of any portion of |
| * this software, then the disclaimer below must also be included. |
| * |
| * This software is provided as is, without representation or warranty |
| * of any kind either express or implied, including without limitation |
| * the implied warranties of merchantability, fitness for a particular |
| * purpose, or noninfringement. The Regents of the University of |
| * Michigan shall not be liable for any damages, including special, |
| * indirect, incidental, or consequential damages, with respect to any |
| * claim arising out of or in connection with the use of the software, |
| * even if it has been or is hereafter advised of the possibility of |
| * such damages. |
| */ |
| |
| #include <linux/nfs_fs.h> |
| #include <linux/nfs_page.h> |
| #include <linux/module.h> |
| #include <linux/backing-dev.h> |
| |
| #include <linux/sunrpc/metrics.h> |
| |
| #include "../nfs4session.h" |
| #include "../internal.h" |
| #include "../delegation.h" |
| #include "filelayout.h" |
| #include "../nfs4trace.h" |
| |
| #define NFSDBG_FACILITY NFSDBG_PNFS_LD |
| |
| MODULE_LICENSE("GPL"); |
| MODULE_AUTHOR("Dean Hildebrand <dhildebz@umich.edu>"); |
| MODULE_DESCRIPTION("The NFSv4 file layout driver"); |
| |
| #define FILELAYOUT_POLL_RETRY_MAX (15*HZ) |
| static const struct pnfs_commit_ops filelayout_commit_ops; |
| |
| static loff_t |
| filelayout_get_dense_offset(struct nfs4_filelayout_segment *flseg, |
| loff_t offset) |
| { |
| u32 stripe_width = flseg->stripe_unit * flseg->dsaddr->stripe_count; |
| u64 stripe_no; |
| u32 rem; |
| |
| offset -= flseg->pattern_offset; |
| stripe_no = div_u64(offset, stripe_width); |
| div_u64_rem(offset, flseg->stripe_unit, &rem); |
| |
| return stripe_no * flseg->stripe_unit + rem; |
| } |
| |
| /* This function is used by the layout driver to calculate the |
| * offset of the file on the dserver based on whether the |
| * layout type is STRIPE_DENSE or STRIPE_SPARSE |
| */ |
| static loff_t |
| filelayout_get_dserver_offset(struct pnfs_layout_segment *lseg, loff_t offset) |
| { |
| struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg); |
| |
| switch (flseg->stripe_type) { |
| case STRIPE_SPARSE: |
| return offset; |
| |
| case STRIPE_DENSE: |
| return filelayout_get_dense_offset(flseg, offset); |
| } |
| |
| BUG(); |
| } |
| |
| static void filelayout_reset_write(struct nfs_pgio_header *hdr) |
| { |
| struct rpc_task *task = &hdr->task; |
| |
| if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { |
| dprintk("%s Reset task %5u for i/o through MDS " |
| "(req %s/%llu, %u bytes @ offset %llu)\n", __func__, |
| hdr->task.tk_pid, |
| hdr->inode->i_sb->s_id, |
| (unsigned long long)NFS_FILEID(hdr->inode), |
| hdr->args.count, |
| (unsigned long long)hdr->args.offset); |
| |
| task->tk_status = pnfs_write_done_resend_to_mds(hdr); |
| } |
| } |
| |
| static void filelayout_reset_read(struct nfs_pgio_header *hdr) |
| { |
| struct rpc_task *task = &hdr->task; |
| |
| if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { |
| dprintk("%s Reset task %5u for i/o through MDS " |
| "(req %s/%llu, %u bytes @ offset %llu)\n", __func__, |
| hdr->task.tk_pid, |
| hdr->inode->i_sb->s_id, |
| (unsigned long long)NFS_FILEID(hdr->inode), |
| hdr->args.count, |
| (unsigned long long)hdr->args.offset); |
| |
| task->tk_status = pnfs_read_done_resend_to_mds(hdr); |
| } |
| } |
| |
| static int filelayout_async_handle_error(struct rpc_task *task, |
| struct nfs4_state *state, |
| struct nfs_client *clp, |
| struct pnfs_layout_segment *lseg) |
| { |
| struct pnfs_layout_hdr *lo = lseg->pls_layout; |
| struct inode *inode = lo->plh_inode; |
| struct nfs4_deviceid_node *devid = FILELAYOUT_DEVID_NODE(lseg); |
| struct nfs4_slot_table *tbl = &clp->cl_session->fc_slot_table; |
| |
| if (task->tk_status >= 0) |
| return 0; |
| |
| switch (task->tk_status) { |
| /* DS session errors */ |
| case -NFS4ERR_BADSESSION: |
| case -NFS4ERR_BADSLOT: |
| case -NFS4ERR_BAD_HIGH_SLOT: |
| case -NFS4ERR_DEADSESSION: |
| case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: |
| case -NFS4ERR_SEQ_FALSE_RETRY: |
| case -NFS4ERR_SEQ_MISORDERED: |
| dprintk("%s ERROR %d, Reset session. Exchangeid " |
| "flags 0x%x\n", __func__, task->tk_status, |
| clp->cl_exchange_flags); |
| nfs4_schedule_session_recovery(clp->cl_session, task->tk_status); |
| break; |
| case -NFS4ERR_DELAY: |
| case -NFS4ERR_GRACE: |
| rpc_delay(task, FILELAYOUT_POLL_RETRY_MAX); |
| break; |
| case -NFS4ERR_RETRY_UNCACHED_REP: |
| break; |
| /* Invalidate Layout errors */ |
| case -NFS4ERR_ACCESS: |
| case -NFS4ERR_PNFS_NO_LAYOUT: |
| case -ESTALE: /* mapped NFS4ERR_STALE */ |
| case -EBADHANDLE: /* mapped NFS4ERR_BADHANDLE */ |
| case -EISDIR: /* mapped NFS4ERR_ISDIR */ |
| case -NFS4ERR_FHEXPIRED: |
| case -NFS4ERR_WRONG_TYPE: |
| dprintk("%s Invalid layout error %d\n", __func__, |
| task->tk_status); |
| /* |
| * Destroy layout so new i/o will get a new layout. |
| * Layout will not be destroyed until all current lseg |
| * references are put. Mark layout as invalid to resend failed |
| * i/o and all i/o waiting on the slot table to the MDS until |
| * layout is destroyed and a new valid layout is obtained. |
| */ |
| pnfs_destroy_layout(NFS_I(inode)); |
| rpc_wake_up(&tbl->slot_tbl_waitq); |
| goto reset; |
| /* RPC connection errors */ |
| case -ECONNREFUSED: |
| case -EHOSTDOWN: |
| case -EHOSTUNREACH: |
| case -ENETUNREACH: |
| case -EIO: |
| case -ETIMEDOUT: |
| case -EPIPE: |
| dprintk("%s DS connection error %d\n", __func__, |
| task->tk_status); |
| nfs4_mark_deviceid_unavailable(devid); |
| pnfs_error_mark_layout_for_return(inode, lseg); |
| pnfs_set_lo_fail(lseg); |
| rpc_wake_up(&tbl->slot_tbl_waitq); |
| fallthrough; |
| default: |
| reset: |
| dprintk("%s Retry through MDS. Error %d\n", __func__, |
| task->tk_status); |
| return -NFS4ERR_RESET_TO_MDS; |
| } |
| task->tk_status = 0; |
| return -EAGAIN; |
| } |
| |
| /* NFS_PROTO call done callback routines */ |
| |
| static int filelayout_read_done_cb(struct rpc_task *task, |
| struct nfs_pgio_header *hdr) |
| { |
| int err; |
| |
| trace_nfs4_pnfs_read(hdr, task->tk_status); |
| err = filelayout_async_handle_error(task, hdr->args.context->state, |
| hdr->ds_clp, hdr->lseg); |
| |
| switch (err) { |
| case -NFS4ERR_RESET_TO_MDS: |
| filelayout_reset_read(hdr); |
| return task->tk_status; |
| case -EAGAIN: |
| rpc_restart_call_prepare(task); |
| return -EAGAIN; |
| } |
| |
| return 0; |
| } |
| |
| /* |
| * We reference the rpc_cred of the first WRITE that triggers the need for |
| * a LAYOUTCOMMIT, and use it to send the layoutcommit compound. |
| * rfc5661 is not clear about which credential should be used. |
| */ |
| static void |
| filelayout_set_layoutcommit(struct nfs_pgio_header *hdr) |
| { |
| loff_t end_offs = 0; |
| |
| if (FILELAYOUT_LSEG(hdr->lseg)->commit_through_mds || |
| hdr->res.verf->committed == NFS_FILE_SYNC) |
| return; |
| if (hdr->res.verf->committed == NFS_DATA_SYNC) |
| end_offs = hdr->mds_offset + (loff_t)hdr->res.count; |
| |
| /* Note: if the write is unstable, don't set end_offs until commit */ |
| pnfs_set_layoutcommit(hdr->inode, hdr->lseg, end_offs); |
| dprintk("%s inode %lu pls_end_pos %lu\n", __func__, hdr->inode->i_ino, |
| (unsigned long) NFS_I(hdr->inode)->layout->plh_lwb); |
| } |
| |
| bool |
| filelayout_test_devid_unavailable(struct nfs4_deviceid_node *node) |
| { |
| return filelayout_test_devid_invalid(node) || |
| nfs4_test_deviceid_unavailable(node); |
| } |
| |
| static bool |
| filelayout_reset_to_mds(struct pnfs_layout_segment *lseg) |
| { |
| struct nfs4_deviceid_node *node = FILELAYOUT_DEVID_NODE(lseg); |
| |
| return filelayout_test_devid_unavailable(node); |
| } |
| |
| /* |
| * Call ops for the async read/write cases |
| * In the case of dense layouts, the offset needs to be reset to its |
| * original value. |
| */ |
| static void filelayout_read_prepare(struct rpc_task *task, void *data) |
| { |
| struct nfs_pgio_header *hdr = data; |
| |
| if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) { |
| rpc_exit(task, -EIO); |
| return; |
| } |
| if (filelayout_reset_to_mds(hdr->lseg)) { |
| dprintk("%s task %u reset io to MDS\n", __func__, task->tk_pid); |
| filelayout_reset_read(hdr); |
| rpc_exit(task, 0); |
| return; |
| } |
| hdr->pgio_done_cb = filelayout_read_done_cb; |
| |
| if (nfs4_setup_sequence(hdr->ds_clp, |
| &hdr->args.seq_args, |
| &hdr->res.seq_res, |
| task)) |
| return; |
| if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context, |
| hdr->args.lock_context, FMODE_READ) == -EIO) |
| rpc_exit(task, -EIO); /* lost lock, terminate I/O */ |
| } |
| |
| static void filelayout_read_call_done(struct rpc_task *task, void *data) |
| { |
| struct nfs_pgio_header *hdr = data; |
| |
| if (test_bit(NFS_IOHDR_REDO, &hdr->flags) && |
| task->tk_status == 0) { |
| nfs41_sequence_done(task, &hdr->res.seq_res); |
| return; |
| } |
| |
| /* Note this may cause RPC to be resent */ |
| hdr->mds_ops->rpc_call_done(task, data); |
| } |
| |
| static void filelayout_read_count_stats(struct rpc_task *task, void *data) |
| { |
| struct nfs_pgio_header *hdr = data; |
| |
| rpc_count_iostats(task, NFS_SERVER(hdr->inode)->client->cl_metrics); |
| } |
| |
| static int filelayout_write_done_cb(struct rpc_task *task, |
| struct nfs_pgio_header *hdr) |
| { |
| int err; |
| |
| trace_nfs4_pnfs_write(hdr, task->tk_status); |
| err = filelayout_async_handle_error(task, hdr->args.context->state, |
| hdr->ds_clp, hdr->lseg); |
| |
| switch (err) { |
| case -NFS4ERR_RESET_TO_MDS: |
| filelayout_reset_write(hdr); |
| return task->tk_status; |
| case -EAGAIN: |
| rpc_restart_call_prepare(task); |
| return -EAGAIN; |
| } |
| |
| filelayout_set_layoutcommit(hdr); |
| |
| /* zero out the fattr */ |
| hdr->fattr.valid = 0; |
| if (task->tk_status >= 0) |
| nfs_writeback_update_inode(hdr); |
| |
| return 0; |
| } |
| |
| static int filelayout_commit_done_cb(struct rpc_task *task, |
| struct nfs_commit_data *data) |
| { |
| int err; |
| |
| trace_nfs4_pnfs_commit_ds(data, task->tk_status); |
| err = filelayout_async_handle_error(task, NULL, data->ds_clp, |
| data->lseg); |
| |
| switch (err) { |
| case -NFS4ERR_RESET_TO_MDS: |
| pnfs_generic_prepare_to_resend_writes(data); |
| return -EAGAIN; |
| case -EAGAIN: |
| rpc_restart_call_prepare(task); |
| return -EAGAIN; |
| } |
| |
| pnfs_set_layoutcommit(data->inode, data->lseg, data->lwb); |
| |
| return 0; |
| } |
| |
| static void filelayout_write_prepare(struct rpc_task *task, void *data) |
| { |
| struct nfs_pgio_header *hdr = data; |
| |
| if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) { |
| rpc_exit(task, -EIO); |
| return; |
| } |
| if (filelayout_reset_to_mds(hdr->lseg)) { |
| dprintk("%s task %u reset io to MDS\n", __func__, task->tk_pid); |
| filelayout_reset_write(hdr); |
| rpc_exit(task, 0); |
| return; |
| } |
| if (nfs4_setup_sequence(hdr->ds_clp, |
| &hdr->args.seq_args, |
| &hdr->res.seq_res, |
| task)) |
| return; |
| if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context, |
| hdr->args.lock_context, FMODE_WRITE) == -EIO) |
| rpc_exit(task, -EIO); /* lost lock, terminate I/O */ |
| } |
| |
| static void filelayout_write_call_done(struct rpc_task *task, void *data) |
| { |
| struct nfs_pgio_header *hdr = data; |
| |
| if (test_bit(NFS_IOHDR_REDO, &hdr->flags) && |
| task->tk_status == 0) { |
| nfs41_sequence_done(task, &hdr->res.seq_res); |
| return; |
| } |
| |
| /* Note this may cause RPC to be resent */ |
| hdr->mds_ops->rpc_call_done(task, data); |
| } |
| |
| static void filelayout_write_count_stats(struct rpc_task *task, void *data) |
| { |
| struct nfs_pgio_header *hdr = data; |
| |
| rpc_count_iostats(task, NFS_SERVER(hdr->inode)->client->cl_metrics); |
| } |
| |
| static void filelayout_commit_prepare(struct rpc_task *task, void *data) |
| { |
| struct nfs_commit_data *wdata = data; |
| |
| nfs4_setup_sequence(wdata->ds_clp, |
| &wdata->args.seq_args, |
| &wdata->res.seq_res, |
| task); |
| } |
| |
| static void filelayout_commit_count_stats(struct rpc_task *task, void *data) |
| { |
| struct nfs_commit_data *cdata = data; |
| |
| rpc_count_iostats(task, NFS_SERVER(cdata->inode)->client->cl_metrics); |
| } |
| |
| static const struct rpc_call_ops filelayout_read_call_ops = { |
| .rpc_call_prepare = filelayout_read_prepare, |
| .rpc_call_done = filelayout_read_call_done, |
| .rpc_count_stats = filelayout_read_count_stats, |
| .rpc_release = pnfs_generic_rw_release, |
| }; |
| |
| static const struct rpc_call_ops filelayout_write_call_ops = { |
| .rpc_call_prepare = filelayout_write_prepare, |
| .rpc_call_done = filelayout_write_call_done, |
| .rpc_count_stats = filelayout_write_count_stats, |
| .rpc_release = pnfs_generic_rw_release, |
| }; |
| |
| static const struct rpc_call_ops filelayout_commit_call_ops = { |
| .rpc_call_prepare = filelayout_commit_prepare, |
| .rpc_call_done = pnfs_generic_write_commit_done, |
| .rpc_count_stats = filelayout_commit_count_stats, |
| .rpc_release = pnfs_generic_commit_release, |
| }; |
| |
| static enum pnfs_try_status |
| filelayout_read_pagelist(struct nfs_pgio_header *hdr) |
| { |
| struct pnfs_layout_segment *lseg = hdr->lseg; |
| struct nfs4_pnfs_ds *ds; |
| struct rpc_clnt *ds_clnt; |
| loff_t offset = hdr->args.offset; |
| u32 j, idx; |
| struct nfs_fh *fh; |
| |
| dprintk("--> %s ino %lu pgbase %u req %zu@%llu\n", |
| __func__, hdr->inode->i_ino, |
| hdr->args.pgbase, (size_t)hdr->args.count, offset); |
| |
| /* Retrieve the correct rpc_client for the byte range */ |
| j = nfs4_fl_calc_j_index(lseg, offset); |
| idx = nfs4_fl_calc_ds_index(lseg, j); |
| ds = nfs4_fl_prepare_ds(lseg, idx); |
| if (!ds) |
| return PNFS_NOT_ATTEMPTED; |
| |
| ds_clnt = nfs4_find_or_create_ds_client(ds->ds_clp, hdr->inode); |
| if (IS_ERR(ds_clnt)) |
| return PNFS_NOT_ATTEMPTED; |
| |
| dprintk("%s USE DS: %s cl_count %d\n", __func__, |
| ds->ds_remotestr, refcount_read(&ds->ds_clp->cl_count)); |
| |
| /* No multipath support. Use first DS */ |
| refcount_inc(&ds->ds_clp->cl_count); |
| hdr->ds_clp = ds->ds_clp; |
| hdr->ds_commit_idx = idx; |
| fh = nfs4_fl_select_ds_fh(lseg, j); |
| if (fh) |
| hdr->args.fh = fh; |
| |
| hdr->args.offset = filelayout_get_dserver_offset(lseg, offset); |
| hdr->mds_offset = offset; |
| |
| /* Perform an asynchronous read to ds */ |
| nfs_initiate_pgio(ds_clnt, hdr, hdr->cred, |
| NFS_PROTO(hdr->inode), &filelayout_read_call_ops, |
| 0, RPC_TASK_SOFTCONN); |
| return PNFS_ATTEMPTED; |
| } |
| |
| /* Perform async writes. */ |
| static enum pnfs_try_status |
| filelayout_write_pagelist(struct nfs_pgio_header *hdr, int sync) |
| { |
| struct pnfs_layout_segment *lseg = hdr->lseg; |
| struct nfs4_pnfs_ds *ds; |
| struct rpc_clnt *ds_clnt; |
| loff_t offset = hdr->args.offset; |
| u32 j, idx; |
| struct nfs_fh *fh; |
| |
| /* Retrieve the correct rpc_client for the byte range */ |
| j = nfs4_fl_calc_j_index(lseg, offset); |
| idx = nfs4_fl_calc_ds_index(lseg, j); |
| ds = nfs4_fl_prepare_ds(lseg, idx); |
| if (!ds) |
| return PNFS_NOT_ATTEMPTED; |
| |
| ds_clnt = nfs4_find_or_create_ds_client(ds->ds_clp, hdr->inode); |
| if (IS_ERR(ds_clnt)) |
| return PNFS_NOT_ATTEMPTED; |
| |
| dprintk("%s ino %lu sync %d req %zu@%llu DS: %s cl_count %d\n", |
| __func__, hdr->inode->i_ino, sync, (size_t) hdr->args.count, |
| offset, ds->ds_remotestr, refcount_read(&ds->ds_clp->cl_count)); |
| |
| hdr->pgio_done_cb = filelayout_write_done_cb; |
| refcount_inc(&ds->ds_clp->cl_count); |
| hdr->ds_clp = ds->ds_clp; |
| hdr->ds_commit_idx = idx; |
| fh = nfs4_fl_select_ds_fh(lseg, j); |
| if (fh) |
| hdr->args.fh = fh; |
| hdr->args.offset = filelayout_get_dserver_offset(lseg, offset); |
| |
| /* Perform an asynchronous write */ |
| nfs_initiate_pgio(ds_clnt, hdr, hdr->cred, |
| NFS_PROTO(hdr->inode), &filelayout_write_call_ops, |
| sync, RPC_TASK_SOFTCONN); |
| return PNFS_ATTEMPTED; |
| } |
| |
| static int |
| filelayout_check_deviceid(struct pnfs_layout_hdr *lo, |
| struct nfs4_filelayout_segment *fl, |
| gfp_t gfp_flags) |
| { |
| struct nfs4_deviceid_node *d; |
| struct nfs4_file_layout_dsaddr *dsaddr; |
| int status = -EINVAL; |
| |
| /* Is the deviceid already set? If so, we're good. */ |
| if (fl->dsaddr != NULL) |
| return 0; |
| |
| /* find and reference the deviceid */ |
| d = nfs4_find_get_deviceid(NFS_SERVER(lo->plh_inode), &fl->deviceid, |
| lo->plh_lc_cred, gfp_flags); |
| if (d == NULL) |
| goto out; |
| |
| dsaddr = container_of(d, struct nfs4_file_layout_dsaddr, id_node); |
| /* Found deviceid is unavailable */ |
| if (filelayout_test_devid_unavailable(&dsaddr->id_node)) |
| goto out_put; |
| |
| if (fl->first_stripe_index >= dsaddr->stripe_count) { |
| dprintk("%s Bad first_stripe_index %u\n", |
| __func__, fl->first_stripe_index); |
| goto out_put; |
| } |
| |
| if ((fl->stripe_type == STRIPE_SPARSE && |
| fl->num_fh > 1 && fl->num_fh != dsaddr->ds_num) || |
| (fl->stripe_type == STRIPE_DENSE && |
| fl->num_fh != dsaddr->stripe_count)) { |
| dprintk("%s num_fh %u not valid for given packing\n", |
| __func__, fl->num_fh); |
| goto out_put; |
| } |
| status = 0; |
| |
| /* |
| * Atomic compare and xchange to ensure we don't scribble |
| * over a non-NULL pointer. |
| */ |
| if (cmpxchg(&fl->dsaddr, NULL, dsaddr) != NULL) |
| goto out_put; |
| out: |
| return status; |
| out_put: |
| nfs4_fl_put_deviceid(dsaddr); |
| goto out; |
| } |
| |
| /* |
| * filelayout_check_layout() |
| * |
| * Make sure layout segment parameters are sane WRT the device. |
| * At this point no generic layer initialization of the lseg has occurred, |
| * and nothing has been added to the layout_hdr cache. |
| * |
| */ |
| static int |
| filelayout_check_layout(struct pnfs_layout_hdr *lo, |
| struct nfs4_filelayout_segment *fl, |
| struct nfs4_layoutget_res *lgr, |
| gfp_t gfp_flags) |
| { |
| int status = -EINVAL; |
| |
| dprintk("--> %s\n", __func__); |
| |
| /* FIXME: remove this check when layout segment support is added */ |
| if (lgr->range.offset != 0 || |
| lgr->range.length != NFS4_MAX_UINT64) { |
| dprintk("%s Only whole file layouts supported. Use MDS i/o\n", |
| __func__); |
| goto out; |
| } |
| |
| if (fl->pattern_offset > lgr->range.offset) { |
| dprintk("%s pattern_offset %lld too large\n", |
| __func__, fl->pattern_offset); |
| goto out; |
| } |
| |
| if (!fl->stripe_unit) { |
| dprintk("%s Invalid stripe unit (%u)\n", |
| __func__, fl->stripe_unit); |
| goto out; |
| } |
| |
| status = 0; |
| out: |
| dprintk("--> %s returns %d\n", __func__, status); |
| return status; |
| } |
| |
| static void _filelayout_free_lseg(struct nfs4_filelayout_segment *fl) |
| { |
| int i; |
| |
| if (fl->fh_array) { |
| for (i = 0; i < fl->num_fh; i++) { |
| if (!fl->fh_array[i]) |
| break; |
| kfree(fl->fh_array[i]); |
| } |
| kfree(fl->fh_array); |
| } |
| kfree(fl); |
| } |
| |
| static int |
| filelayout_decode_layout(struct pnfs_layout_hdr *flo, |
| struct nfs4_filelayout_segment *fl, |
| struct nfs4_layoutget_res *lgr, |
| gfp_t gfp_flags) |
| { |
| struct xdr_stream stream; |
| struct xdr_buf buf; |
| struct page *scratch; |
| __be32 *p; |
| uint32_t nfl_util; |
| int i; |
| |
| dprintk("%s: set_layout_map Begin\n", __func__); |
| |
| scratch = alloc_page(gfp_flags); |
| if (!scratch) |
| return -ENOMEM; |
| |
| xdr_init_decode_pages(&stream, &buf, lgr->layoutp->pages, lgr->layoutp->len); |
| xdr_set_scratch_page(&stream, scratch); |
| |
| /* 20 = ufl_util (4), first_stripe_index (4), pattern_offset (8), |
| * num_fh (4) */ |
| p = xdr_inline_decode(&stream, NFS4_DEVICEID4_SIZE + 20); |
| if (unlikely(!p)) |
| goto out_err; |
| |
| memcpy(&fl->deviceid, p, sizeof(fl->deviceid)); |
| p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE); |
| nfs4_print_deviceid(&fl->deviceid); |
| |
| nfl_util = be32_to_cpup(p++); |
| if (nfl_util & NFL4_UFLG_COMMIT_THRU_MDS) |
| fl->commit_through_mds = 1; |
| if (nfl_util & NFL4_UFLG_DENSE) |
| fl->stripe_type = STRIPE_DENSE; |
| else |
| fl->stripe_type = STRIPE_SPARSE; |
| fl->stripe_unit = nfl_util & ~NFL4_UFLG_MASK; |
| |
| fl->first_stripe_index = be32_to_cpup(p++); |
| p = xdr_decode_hyper(p, &fl->pattern_offset); |
| fl->num_fh = be32_to_cpup(p++); |
| |
| dprintk("%s: nfl_util 0x%X num_fh %u fsi %u po %llu\n", |
| __func__, nfl_util, fl->num_fh, fl->first_stripe_index, |
| fl->pattern_offset); |
| |
| /* Note that a zero value for num_fh is legal for STRIPE_SPARSE. |
| * Futher checking is done in filelayout_check_layout */ |
| if (fl->num_fh > |
| max(NFS4_PNFS_MAX_STRIPE_CNT, NFS4_PNFS_MAX_MULTI_CNT)) |
| goto out_err; |
| |
| if (fl->num_fh > 0) { |
| fl->fh_array = kcalloc(fl->num_fh, sizeof(fl->fh_array[0]), |
| gfp_flags); |
| if (!fl->fh_array) |
| goto out_err; |
| } |
| |
| for (i = 0; i < fl->num_fh; i++) { |
| /* Do we want to use a mempool here? */ |
| fl->fh_array[i] = kmalloc(sizeof(struct nfs_fh), gfp_flags); |
| if (!fl->fh_array[i]) |
| goto out_err; |
| |
| p = xdr_inline_decode(&stream, 4); |
| if (unlikely(!p)) |
| goto out_err; |
| fl->fh_array[i]->size = be32_to_cpup(p++); |
| if (fl->fh_array[i]->size > NFS_MAXFHSIZE) { |
| printk(KERN_ERR "NFS: Too big fh %d received %d\n", |
| i, fl->fh_array[i]->size); |
| goto out_err; |
| } |
| |
| p = xdr_inline_decode(&stream, fl->fh_array[i]->size); |
| if (unlikely(!p)) |
| goto out_err; |
| memcpy(fl->fh_array[i]->data, p, fl->fh_array[i]->size); |
| dprintk("DEBUG: %s: fh len %d\n", __func__, |
| fl->fh_array[i]->size); |
| } |
| |
| __free_page(scratch); |
| return 0; |
| |
| out_err: |
| __free_page(scratch); |
| return -EIO; |
| } |
| |
| static void |
| filelayout_free_lseg(struct pnfs_layout_segment *lseg) |
| { |
| struct nfs4_filelayout_segment *fl = FILELAYOUT_LSEG(lseg); |
| |
| dprintk("--> %s\n", __func__); |
| if (fl->dsaddr != NULL) |
| nfs4_fl_put_deviceid(fl->dsaddr); |
| /* This assumes a single RW lseg */ |
| if (lseg->pls_range.iomode == IOMODE_RW) { |
| struct nfs4_filelayout *flo; |
| struct inode *inode; |
| |
| flo = FILELAYOUT_FROM_HDR(lseg->pls_layout); |
| inode = flo->generic_hdr.plh_inode; |
| spin_lock(&inode->i_lock); |
| pnfs_generic_ds_cinfo_release_lseg(&flo->commit_info, lseg); |
| spin_unlock(&inode->i_lock); |
| } |
| _filelayout_free_lseg(fl); |
| } |
| |
| static struct pnfs_layout_segment * |
| filelayout_alloc_lseg(struct pnfs_layout_hdr *layoutid, |
| struct nfs4_layoutget_res *lgr, |
| gfp_t gfp_flags) |
| { |
| struct nfs4_filelayout_segment *fl; |
| int rc; |
| |
| dprintk("--> %s\n", __func__); |
| fl = kzalloc(sizeof(*fl), gfp_flags); |
| if (!fl) |
| return NULL; |
| |
| rc = filelayout_decode_layout(layoutid, fl, lgr, gfp_flags); |
| if (rc != 0 || filelayout_check_layout(layoutid, fl, lgr, gfp_flags)) { |
| _filelayout_free_lseg(fl); |
| return NULL; |
| } |
| return &fl->generic_hdr; |
| } |
| |
| /* |
| * filelayout_pg_test(). Called by nfs_can_coalesce_requests() |
| * |
| * Return 0 if @req cannot be coalesced into @pgio, otherwise return the number |
| * of bytes (maximum @req->wb_bytes) that can be coalesced. |
| */ |
| static size_t |
| filelayout_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev, |
| struct nfs_page *req) |
| { |
| unsigned int size; |
| u64 p_stripe, r_stripe; |
| u32 stripe_offset; |
| u64 segment_offset = pgio->pg_lseg->pls_range.offset; |
| u32 stripe_unit = FILELAYOUT_LSEG(pgio->pg_lseg)->stripe_unit; |
| |
| /* calls nfs_generic_pg_test */ |
| size = pnfs_generic_pg_test(pgio, prev, req); |
| if (!size) |
| return 0; |
| |
| /* see if req and prev are in the same stripe */ |
| if (prev) { |
| p_stripe = (u64)req_offset(prev) - segment_offset; |
| r_stripe = (u64)req_offset(req) - segment_offset; |
| do_div(p_stripe, stripe_unit); |
| do_div(r_stripe, stripe_unit); |
| |
| if (p_stripe != r_stripe) |
| return 0; |
| } |
| |
| /* calculate remaining bytes in the current stripe */ |
| div_u64_rem((u64)req_offset(req) - segment_offset, |
| stripe_unit, |
| &stripe_offset); |
| WARN_ON_ONCE(stripe_offset > stripe_unit); |
| if (stripe_offset >= stripe_unit) |
| return 0; |
| return min(stripe_unit - (unsigned int)stripe_offset, size); |
| } |
| |
| static struct pnfs_layout_segment * |
| fl_pnfs_update_layout(struct inode *ino, |
| struct nfs_open_context *ctx, |
| loff_t pos, |
| u64 count, |
| enum pnfs_iomode iomode, |
| bool strict_iomode, |
| gfp_t gfp_flags) |
| { |
| struct pnfs_layout_segment *lseg = NULL; |
| struct pnfs_layout_hdr *lo; |
| struct nfs4_filelayout_segment *fl; |
| int status; |
| |
| lseg = pnfs_update_layout(ino, ctx, pos, count, iomode, strict_iomode, |
| gfp_flags); |
| if (IS_ERR_OR_NULL(lseg)) |
| goto out; |
| |
| lo = NFS_I(ino)->layout; |
| fl = FILELAYOUT_LSEG(lseg); |
| |
| status = filelayout_check_deviceid(lo, fl, gfp_flags); |
| if (status) { |
| pnfs_put_lseg(lseg); |
| lseg = NULL; |
| } |
| out: |
| return lseg; |
| } |
| |
| static void |
| filelayout_pg_init_read(struct nfs_pageio_descriptor *pgio, |
| struct nfs_page *req) |
| { |
| pnfs_generic_pg_check_layout(pgio); |
| if (!pgio->pg_lseg) { |
| pgio->pg_lseg = fl_pnfs_update_layout(pgio->pg_inode, |
| nfs_req_openctx(req), |
| 0, |
| NFS4_MAX_UINT64, |
| IOMODE_READ, |
| false, |
| GFP_KERNEL); |
| if (IS_ERR(pgio->pg_lseg)) { |
| pgio->pg_error = PTR_ERR(pgio->pg_lseg); |
| pgio->pg_lseg = NULL; |
| return; |
| } |
| } |
| /* If no lseg, fall back to read through mds */ |
| if (pgio->pg_lseg == NULL) |
| nfs_pageio_reset_read_mds(pgio); |
| } |
| |
| static void |
| filelayout_pg_init_write(struct nfs_pageio_descriptor *pgio, |
| struct nfs_page *req) |
| { |
| pnfs_generic_pg_check_layout(pgio); |
| if (!pgio->pg_lseg) { |
| pgio->pg_lseg = fl_pnfs_update_layout(pgio->pg_inode, |
| nfs_req_openctx(req), |
| 0, |
| NFS4_MAX_UINT64, |
| IOMODE_RW, |
| false, |
| GFP_NOFS); |
| if (IS_ERR(pgio->pg_lseg)) { |
| pgio->pg_error = PTR_ERR(pgio->pg_lseg); |
| pgio->pg_lseg = NULL; |
| return; |
| } |
| } |
| |
| /* If no lseg, fall back to write through mds */ |
| if (pgio->pg_lseg == NULL) |
| nfs_pageio_reset_write_mds(pgio); |
| } |
| |
| static const struct nfs_pageio_ops filelayout_pg_read_ops = { |
| .pg_init = filelayout_pg_init_read, |
| .pg_test = filelayout_pg_test, |
| .pg_doio = pnfs_generic_pg_readpages, |
| .pg_cleanup = pnfs_generic_pg_cleanup, |
| }; |
| |
| static const struct nfs_pageio_ops filelayout_pg_write_ops = { |
| .pg_init = filelayout_pg_init_write, |
| .pg_test = filelayout_pg_test, |
| .pg_doio = pnfs_generic_pg_writepages, |
| .pg_cleanup = pnfs_generic_pg_cleanup, |
| }; |
| |
| static u32 select_bucket_index(struct nfs4_filelayout_segment *fl, u32 j) |
| { |
| if (fl->stripe_type == STRIPE_SPARSE) |
| return nfs4_fl_calc_ds_index(&fl->generic_hdr, j); |
| else |
| return j; |
| } |
| |
| static void |
| filelayout_mark_request_commit(struct nfs_page *req, |
| struct pnfs_layout_segment *lseg, |
| struct nfs_commit_info *cinfo, |
| u32 ds_commit_idx) |
| |
| { |
| struct nfs4_filelayout_segment *fl = FILELAYOUT_LSEG(lseg); |
| u32 i, j; |
| |
| if (fl->commit_through_mds) { |
| nfs_request_add_commit_list(req, cinfo); |
| } else { |
| /* Note that we are calling nfs4_fl_calc_j_index on each page |
| * that ends up being committed to a data server. An attractive |
| * alternative is to add a field to nfs_write_data and nfs_page |
| * to store the value calculated in filelayout_write_pagelist |
| * and just use that here. |
| */ |
| j = nfs4_fl_calc_j_index(lseg, req_offset(req)); |
| i = select_bucket_index(fl, j); |
| pnfs_layout_mark_request_commit(req, lseg, cinfo, i); |
| } |
| } |
| |
| static u32 calc_ds_index_from_commit(struct pnfs_layout_segment *lseg, u32 i) |
| { |
| struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg); |
| |
| if (flseg->stripe_type == STRIPE_SPARSE) |
| return i; |
| else |
| return nfs4_fl_calc_ds_index(lseg, i); |
| } |
| |
| static struct nfs_fh * |
| select_ds_fh_from_commit(struct pnfs_layout_segment *lseg, u32 i) |
| { |
| struct nfs4_filelayout_segment *flseg = FILELAYOUT_LSEG(lseg); |
| |
| if (flseg->stripe_type == STRIPE_SPARSE) { |
| if (flseg->num_fh == 1) |
| i = 0; |
| else if (flseg->num_fh == 0) |
| /* Use the MDS OPEN fh set in nfs_read_rpcsetup */ |
| return NULL; |
| } |
| return flseg->fh_array[i]; |
| } |
| |
| static int filelayout_initiate_commit(struct nfs_commit_data *data, int how) |
| { |
| struct pnfs_layout_segment *lseg = data->lseg; |
| struct nfs4_pnfs_ds *ds; |
| struct rpc_clnt *ds_clnt; |
| u32 idx; |
| struct nfs_fh *fh; |
| |
| idx = calc_ds_index_from_commit(lseg, data->ds_commit_index); |
| ds = nfs4_fl_prepare_ds(lseg, idx); |
| if (!ds) |
| goto out_err; |
| |
| ds_clnt = nfs4_find_or_create_ds_client(ds->ds_clp, data->inode); |
| if (IS_ERR(ds_clnt)) |
| goto out_err; |
| |
| dprintk("%s ino %lu, how %d cl_count %d\n", __func__, |
| data->inode->i_ino, how, refcount_read(&ds->ds_clp->cl_count)); |
| data->commit_done_cb = filelayout_commit_done_cb; |
| refcount_inc(&ds->ds_clp->cl_count); |
| data->ds_clp = ds->ds_clp; |
| fh = select_ds_fh_from_commit(lseg, data->ds_commit_index); |
| if (fh) |
| data->args.fh = fh; |
| return nfs_initiate_commit(ds_clnt, data, NFS_PROTO(data->inode), |
| &filelayout_commit_call_ops, how, |
| RPC_TASK_SOFTCONN); |
| out_err: |
| pnfs_generic_prepare_to_resend_writes(data); |
| pnfs_generic_commit_release(data); |
| return -EAGAIN; |
| } |
| |
| static int |
| filelayout_commit_pagelist(struct inode *inode, struct list_head *mds_pages, |
| int how, struct nfs_commit_info *cinfo) |
| { |
| return pnfs_generic_commit_pagelist(inode, mds_pages, how, cinfo, |
| filelayout_initiate_commit); |
| } |
| |
| static struct nfs4_deviceid_node * |
| filelayout_alloc_deviceid_node(struct nfs_server *server, |
| struct pnfs_device *pdev, gfp_t gfp_flags) |
| { |
| struct nfs4_file_layout_dsaddr *dsaddr; |
| |
| dsaddr = nfs4_fl_alloc_deviceid_node(server, pdev, gfp_flags); |
| if (!dsaddr) |
| return NULL; |
| return &dsaddr->id_node; |
| } |
| |
| static void |
| filelayout_free_deviceid_node(struct nfs4_deviceid_node *d) |
| { |
| nfs4_fl_free_deviceid(container_of(d, struct nfs4_file_layout_dsaddr, id_node)); |
| } |
| |
| static struct pnfs_layout_hdr * |
| filelayout_alloc_layout_hdr(struct inode *inode, gfp_t gfp_flags) |
| { |
| struct nfs4_filelayout *flo; |
| |
| flo = kzalloc(sizeof(*flo), gfp_flags); |
| if (flo == NULL) |
| return NULL; |
| pnfs_init_ds_commit_info(&flo->commit_info); |
| flo->commit_info.ops = &filelayout_commit_ops; |
| return &flo->generic_hdr; |
| } |
| |
| static void |
| filelayout_free_layout_hdr(struct pnfs_layout_hdr *lo) |
| { |
| kfree_rcu(FILELAYOUT_FROM_HDR(lo), generic_hdr.plh_rcu); |
| } |
| |
| static struct pnfs_ds_commit_info * |
| filelayout_get_ds_info(struct inode *inode) |
| { |
| struct pnfs_layout_hdr *layout = NFS_I(inode)->layout; |
| |
| if (layout == NULL) |
| return NULL; |
| else |
| return &FILELAYOUT_FROM_HDR(layout)->commit_info; |
| } |
| |
| static void |
| filelayout_setup_ds_info(struct pnfs_ds_commit_info *fl_cinfo, |
| struct pnfs_layout_segment *lseg) |
| { |
| struct nfs4_filelayout_segment *fl = FILELAYOUT_LSEG(lseg); |
| struct inode *inode = lseg->pls_layout->plh_inode; |
| struct pnfs_commit_array *array, *new; |
| unsigned int size = (fl->stripe_type == STRIPE_SPARSE) ? |
| fl->dsaddr->ds_num : fl->dsaddr->stripe_count; |
| |
| new = pnfs_alloc_commit_array(size, GFP_NOIO); |
| if (new) { |
| spin_lock(&inode->i_lock); |
| array = pnfs_add_commit_array(fl_cinfo, new, lseg); |
| spin_unlock(&inode->i_lock); |
| if (array != new) |
| pnfs_free_commit_array(new); |
| } |
| } |
| |
| static void |
| filelayout_release_ds_info(struct pnfs_ds_commit_info *fl_cinfo, |
| struct inode *inode) |
| { |
| spin_lock(&inode->i_lock); |
| pnfs_generic_ds_cinfo_destroy(fl_cinfo); |
| spin_unlock(&inode->i_lock); |
| } |
| |
| static const struct pnfs_commit_ops filelayout_commit_ops = { |
| .setup_ds_info = filelayout_setup_ds_info, |
| .release_ds_info = filelayout_release_ds_info, |
| .mark_request_commit = filelayout_mark_request_commit, |
| .clear_request_commit = pnfs_generic_clear_request_commit, |
| .scan_commit_lists = pnfs_generic_scan_commit_lists, |
| .recover_commit_reqs = pnfs_generic_recover_commit_reqs, |
| .search_commit_reqs = pnfs_generic_search_commit_reqs, |
| .commit_pagelist = filelayout_commit_pagelist, |
| }; |
| |
| static struct pnfs_layoutdriver_type filelayout_type = { |
| .id = LAYOUT_NFSV4_1_FILES, |
| .name = "LAYOUT_NFSV4_1_FILES", |
| .owner = THIS_MODULE, |
| .flags = PNFS_LAYOUTGET_ON_OPEN, |
| .max_layoutget_response = 4096, /* 1 page or so... */ |
| .alloc_layout_hdr = filelayout_alloc_layout_hdr, |
| .free_layout_hdr = filelayout_free_layout_hdr, |
| .alloc_lseg = filelayout_alloc_lseg, |
| .free_lseg = filelayout_free_lseg, |
| .pg_read_ops = &filelayout_pg_read_ops, |
| .pg_write_ops = &filelayout_pg_write_ops, |
| .get_ds_info = &filelayout_get_ds_info, |
| .read_pagelist = filelayout_read_pagelist, |
| .write_pagelist = filelayout_write_pagelist, |
| .alloc_deviceid_node = filelayout_alloc_deviceid_node, |
| .free_deviceid_node = filelayout_free_deviceid_node, |
| .sync = pnfs_nfs_generic_sync, |
| }; |
| |
| static int __init nfs4filelayout_init(void) |
| { |
| printk(KERN_INFO "%s: NFSv4 File Layout Driver Registering...\n", |
| __func__); |
| return pnfs_register_layoutdriver(&filelayout_type); |
| } |
| |
| static void __exit nfs4filelayout_exit(void) |
| { |
| printk(KERN_INFO "%s: NFSv4 File Layout Driver Unregistering...\n", |
| __func__); |
| pnfs_unregister_layoutdriver(&filelayout_type); |
| } |
| |
| MODULE_ALIAS("nfs-layouttype4-1"); |
| |
| module_init(nfs4filelayout_init); |
| module_exit(nfs4filelayout_exit); |