/* * pNFS functions to call and manage layout drivers. * * Copyright (c) 2002 [year of first publication] * The Regents of the University of Michigan * All Rights Reserved * * Dean Hildebrand * * 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 #include #include #include #include "internal.h" #include "pnfs.h" #include "iostat.h" #include "nfs4trace.h" #include "delegation.h" #include "nfs42.h" #include "nfs4_fs.h" #define NFSDBG_FACILITY NFSDBG_PNFS #define PNFS_LAYOUTGET_RETRY_TIMEOUT (120*HZ) /* Locking: * * pnfs_spinlock: * protects pnfs_modules_tbl. */ static DEFINE_SPINLOCK(pnfs_spinlock); /* * pnfs_modules_tbl holds all pnfs modules */ static LIST_HEAD(pnfs_modules_tbl); static void pnfs_layoutreturn_before_put_layout_hdr(struct pnfs_layout_hdr *lo); static void pnfs_free_returned_lsegs(struct pnfs_layout_hdr *lo, struct list_head *free_me, const struct pnfs_layout_range *range, u32 seq); static bool pnfs_lseg_dec_and_remove_zero(struct pnfs_layout_segment *lseg, struct list_head *tmp_list); /* Return the registered pnfs layout driver module matching given id */ static struct pnfs_layoutdriver_type * find_pnfs_driver_locked(u32 id) { struct pnfs_layoutdriver_type *local; list_for_each_entry(local, &pnfs_modules_tbl, pnfs_tblid) if (local->id == id) goto out; local = NULL; out: dprintk("%s: Searching for id %u, found %p\n", __func__, id, local); return local; } static struct pnfs_layoutdriver_type * find_pnfs_driver(u32 id) { struct pnfs_layoutdriver_type *local; spin_lock(&pnfs_spinlock); local = find_pnfs_driver_locked(id); if (local != NULL && !try_module_get(local->owner)) { dprintk("%s: Could not grab reference on module\n", __func__); local = NULL; } spin_unlock(&pnfs_spinlock); return local; } void unset_pnfs_layoutdriver(struct nfs_server *nfss) { if (nfss->pnfs_curr_ld) { if (nfss->pnfs_curr_ld->clear_layoutdriver) nfss->pnfs_curr_ld->clear_layoutdriver(nfss); /* Decrement the MDS count. Purge the deviceid cache if zero */ if (atomic_dec_and_test(&nfss->nfs_client->cl_mds_count)) nfs4_deviceid_purge_client(nfss->nfs_client); module_put(nfss->pnfs_curr_ld->owner); } nfss->pnfs_curr_ld = NULL; } /* * When the server sends a list of layout types, we choose one in the order * given in the list below. * * FIXME: should this list be configurable in some fashion? module param? * mount option? something else? */ static const u32 ld_prefs[] = { LAYOUT_SCSI, LAYOUT_BLOCK_VOLUME, LAYOUT_OSD2_OBJECTS, LAYOUT_FLEX_FILES, LAYOUT_NFSV4_1_FILES, 0 }; static int ld_cmp(const void *e1, const void *e2) { u32 ld1 = *((u32 *)e1); u32 ld2 = *((u32 *)e2); int i; for (i = 0; ld_prefs[i] != 0; i++) { if (ld1 == ld_prefs[i]) return -1; if (ld2 == ld_prefs[i]) return 1; } return 0; } /* * Try to set the server's pnfs module to the pnfs layout type specified by id. * Currently only one pNFS layout driver per filesystem is supported. * * @ids array of layout types supported by MDS. */ void set_pnfs_layoutdriver(struct nfs_server *server, const struct nfs_fh *mntfh, struct nfs_fsinfo *fsinfo) { struct pnfs_layoutdriver_type *ld_type = NULL; u32 id; int i; if (fsinfo->nlayouttypes == 0) goto out_no_driver; if (!(server->nfs_client->cl_exchange_flags & (EXCHGID4_FLAG_USE_NON_PNFS | EXCHGID4_FLAG_USE_PNFS_MDS))) { printk(KERN_ERR "NFS: %s: cl_exchange_flags 0x%x\n", __func__, server->nfs_client->cl_exchange_flags); goto out_no_driver; } sort(fsinfo->layouttype, fsinfo->nlayouttypes, sizeof(*fsinfo->layouttype), ld_cmp, NULL); for (i = 0; i < fsinfo->nlayouttypes; i++) { id = fsinfo->layouttype[i]; ld_type = find_pnfs_driver(id); if (!ld_type) { request_module("%s-%u", LAYOUT_NFSV4_1_MODULE_PREFIX, id); ld_type = find_pnfs_driver(id); } if (ld_type) break; } if (!ld_type) { dprintk("%s: No pNFS module found!\n", __func__); goto out_no_driver; } server->pnfs_curr_ld = ld_type; if (ld_type->set_layoutdriver && ld_type->set_layoutdriver(server, mntfh)) { printk(KERN_ERR "NFS: %s: Error initializing pNFS layout " "driver %u.\n", __func__, id); module_put(ld_type->owner); goto out_no_driver; } /* Bump the MDS count */ atomic_inc(&server->nfs_client->cl_mds_count); dprintk("%s: pNFS module for %u set\n", __func__, id); return; out_no_driver: dprintk("%s: Using NFSv4 I/O\n", __func__); server->pnfs_curr_ld = NULL; } int pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *ld_type) { int status = -EINVAL; struct pnfs_layoutdriver_type *tmp; if (ld_type->id == 0) { printk(KERN_ERR "NFS: %s id 0 is reserved\n", __func__); return status; } if (!ld_type->alloc_lseg || !ld_type->free_lseg) { printk(KERN_ERR "NFS: %s Layout driver must provide " "alloc_lseg and free_lseg.\n", __func__); return status; } spin_lock(&pnfs_spinlock); tmp = find_pnfs_driver_locked(ld_type->id); if (!tmp) { list_add(&ld_type->pnfs_tblid, &pnfs_modules_tbl); status = 0; dprintk("%s Registering id:%u name:%s\n", __func__, ld_type->id, ld_type->name); } else { printk(KERN_ERR "NFS: %s Module with id %d already loaded!\n", __func__, ld_type->id); } spin_unlock(&pnfs_spinlock); return status; } EXPORT_SYMBOL_GPL(pnfs_register_layoutdriver); void pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *ld_type) { dprintk("%s Deregistering id:%u\n", __func__, ld_type->id); spin_lock(&pnfs_spinlock); list_del(&ld_type->pnfs_tblid); spin_unlock(&pnfs_spinlock); } EXPORT_SYMBOL_GPL(pnfs_unregister_layoutdriver); /* * pNFS client layout cache */ /* Need to hold i_lock if caller does not already hold reference */ void pnfs_get_layout_hdr(struct pnfs_layout_hdr *lo) { refcount_inc(&lo->plh_refcount); } static struct pnfs_layout_hdr * pnfs_alloc_layout_hdr(struct inode *ino, gfp_t gfp_flags) { struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld; return ld->alloc_layout_hdr(ino, gfp_flags); } static void pnfs_free_layout_hdr(struct pnfs_layout_hdr *lo) { struct nfs_server *server = NFS_SERVER(lo->plh_inode); struct pnfs_layoutdriver_type *ld = server->pnfs_curr_ld; if (!list_empty(&lo->plh_layouts)) { struct nfs_client *clp = server->nfs_client; spin_lock(&clp->cl_lock); list_del_init(&lo->plh_layouts); spin_unlock(&clp->cl_lock); } put_cred(lo->plh_lc_cred); return ld->free_layout_hdr(lo); } static void pnfs_detach_layout_hdr(struct pnfs_layout_hdr *lo) { struct nfs_inode *nfsi = NFS_I(lo->plh_inode); dprintk("%s: freeing layout cache %p\n", __func__, lo); nfsi->layout = NULL; /* Reset MDS Threshold I/O counters */ nfsi->write_io = 0; nfsi->read_io = 0; } void pnfs_put_layout_hdr(struct pnfs_layout_hdr *lo) { struct inode *inode; if (!lo) return; inode = lo->plh_inode; pnfs_layoutreturn_before_put_layout_hdr(lo); if (refcount_dec_and_lock(&lo->plh_refcount, &inode->i_lock)) { if (!list_empty(&lo->plh_segs)) WARN_ONCE(1, "NFS: BUG unfreed layout segments.\n"); pnfs_detach_layout_hdr(lo); spin_unlock(&inode->i_lock); pnfs_free_layout_hdr(lo); } } static void pnfs_set_plh_return_info(struct pnfs_layout_hdr *lo, enum pnfs_iomode iomode, u32 seq) { if (lo->plh_return_iomode != 0 && lo->plh_return_iomode != iomode) iomode = IOMODE_ANY; lo->plh_return_iomode = iomode; set_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags); if (seq != 0) { WARN_ON_ONCE(lo->plh_return_seq != 0 && lo->plh_return_seq != seq); lo->plh_return_seq = seq; } } static void pnfs_clear_layoutreturn_info(struct pnfs_layout_hdr *lo) { struct pnfs_layout_segment *lseg; lo->plh_return_iomode = 0; lo->plh_return_seq = 0; clear_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags); list_for_each_entry(lseg, &lo->plh_segs, pls_list) { if (!test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags)) continue; pnfs_set_plh_return_info(lo, lseg->pls_range.iomode, 0); } } static void pnfs_clear_layoutreturn_waitbit(struct pnfs_layout_hdr *lo) { clear_bit_unlock(NFS_LAYOUT_RETURN, &lo->plh_flags); clear_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags); smp_mb__after_atomic(); wake_up_bit(&lo->plh_flags, NFS_LAYOUT_RETURN); rpc_wake_up(&NFS_SERVER(lo->plh_inode)->roc_rpcwaitq); } static void pnfs_clear_lseg_state(struct pnfs_layout_segment *lseg, struct list_head *free_me) { clear_bit(NFS_LSEG_ROC, &lseg->pls_flags); clear_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags); if (test_and_clear_bit(NFS_LSEG_VALID, &lseg->pls_flags)) pnfs_lseg_dec_and_remove_zero(lseg, free_me); if (test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags)) pnfs_lseg_dec_and_remove_zero(lseg, free_me); } /* * Update the seqid of a layout stateid after receiving * NFS4ERR_OLD_STATEID */ bool nfs4_layout_refresh_old_stateid(nfs4_stateid *dst, struct pnfs_layout_range *dst_range, struct inode *inode) { struct pnfs_layout_hdr *lo; struct pnfs_layout_range range = { .iomode = IOMODE_ANY, .offset = 0, .length = NFS4_MAX_UINT64, }; bool ret = false; LIST_HEAD(head); int err; spin_lock(&inode->i_lock); lo = NFS_I(inode)->layout; if (lo && pnfs_layout_is_valid(lo) && nfs4_stateid_match_other(dst, &lo->plh_stateid)) { /* Is our call using the most recent seqid? If so, bump it */ if (!nfs4_stateid_is_newer(&lo->plh_stateid, dst)) { nfs4_stateid_seqid_inc(dst); ret = true; goto out; } /* Try to update the seqid to the most recent */ err = pnfs_mark_matching_lsegs_return(lo, &head, &range, 0); if (err != -EBUSY) { dst->seqid = lo->plh_stateid.seqid; *dst_range = range; ret = true; } } out: spin_unlock(&inode->i_lock); pnfs_free_lseg_list(&head); return ret; } /* * Mark a pnfs_layout_hdr and all associated layout segments as invalid * * In order to continue using the pnfs_layout_hdr, a full recovery * is required. * Note that caller must hold inode->i_lock. */ int pnfs_mark_layout_stateid_invalid(struct pnfs_layout_hdr *lo, struct list_head *lseg_list) { struct pnfs_layout_range range = { .iomode = IOMODE_ANY, .offset = 0, .length = NFS4_MAX_UINT64, }; struct pnfs_layout_segment *lseg, *next; set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags); list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list) pnfs_clear_lseg_state(lseg, lseg_list); pnfs_clear_layoutreturn_info(lo); pnfs_free_returned_lsegs(lo, lseg_list, &range, 0); if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags) && !test_and_set_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags)) pnfs_clear_layoutreturn_waitbit(lo); return !list_empty(&lo->plh_segs); } static int pnfs_iomode_to_fail_bit(u32 iomode) { return iomode == IOMODE_RW ? NFS_LAYOUT_RW_FAILED : NFS_LAYOUT_RO_FAILED; } static void pnfs_layout_set_fail_bit(struct pnfs_layout_hdr *lo, int fail_bit) { lo->plh_retry_timestamp = jiffies; if (!test_and_set_bit(fail_bit, &lo->plh_flags)) refcount_inc(&lo->plh_refcount); } static void pnfs_layout_clear_fail_bit(struct pnfs_layout_hdr *lo, int fail_bit) { if (test_and_clear_bit(fail_bit, &lo->plh_flags)) refcount_dec(&lo->plh_refcount); } static void pnfs_layout_io_set_failed(struct pnfs_layout_hdr *lo, u32 iomode) { struct inode *inode = lo->plh_inode; struct pnfs_layout_range range = { .iomode = iomode, .offset = 0, .length = NFS4_MAX_UINT64, }; LIST_HEAD(head); spin_lock(&inode->i_lock); pnfs_layout_set_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode)); pnfs_mark_matching_lsegs_invalid(lo, &head, &range, 0); spin_unlock(&inode->i_lock); pnfs_free_lseg_list(&head); dprintk("%s Setting layout IOMODE_%s fail bit\n", __func__, iomode == IOMODE_RW ? "RW" : "READ"); } static bool pnfs_layout_io_test_failed(struct pnfs_layout_hdr *lo, u32 iomode) { unsigned long start, end; int fail_bit = pnfs_iomode_to_fail_bit(iomode); if (test_bit(fail_bit, &lo->plh_flags) == 0) return false; end = jiffies; start = end - PNFS_LAYOUTGET_RETRY_TIMEOUT; if (!time_in_range(lo->plh_retry_timestamp, start, end)) { /* It is time to retry the failed layoutgets */ pnfs_layout_clear_fail_bit(lo, fail_bit); return false; } return true; } static void pnfs_init_lseg(struct pnfs_layout_hdr *lo, struct pnfs_layout_segment *lseg, const struct pnfs_layout_range *range, const nfs4_stateid *stateid) { INIT_LIST_HEAD(&lseg->pls_list); INIT_LIST_HEAD(&lseg->pls_lc_list); refcount_set(&lseg->pls_refcount, 1); set_bit(NFS_LSEG_VALID, &lseg->pls_flags); lseg->pls_layout = lo; lseg->pls_range = *range; lseg->pls_seq = be32_to_cpu(stateid->seqid); } static void pnfs_free_lseg(struct pnfs_layout_segment *lseg) { if (lseg != NULL) { struct inode *inode = lseg->pls_layout->plh_inode; NFS_SERVER(inode)->pnfs_curr_ld->free_lseg(lseg); } } static void pnfs_layout_remove_lseg(struct pnfs_layout_hdr *lo, struct pnfs_layout_segment *lseg) { WARN_ON(test_bit(NFS_LSEG_VALID, &lseg->pls_flags)); list_del_init(&lseg->pls_list); /* Matched by pnfs_get_layout_hdr in pnfs_layout_insert_lseg */ refcount_dec(&lo->plh_refcount); if (test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags)) return; if (list_empty(&lo->plh_segs) && !test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags) && !test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) { if (atomic_read(&lo->plh_outstanding) == 0) set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags); clear_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags); } } static bool pnfs_cache_lseg_for_layoutreturn(struct pnfs_layout_hdr *lo, struct pnfs_layout_segment *lseg) { if (test_and_clear_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags) && pnfs_layout_is_valid(lo)) { pnfs_set_plh_return_info(lo, lseg->pls_range.iomode, 0); list_move_tail(&lseg->pls_list, &lo->plh_return_segs); return true; } return false; } void pnfs_put_lseg(struct pnfs_layout_segment *lseg) { struct pnfs_layout_hdr *lo; struct inode *inode; if (!lseg) return; dprintk("%s: lseg %p ref %d valid %d\n", __func__, lseg, refcount_read(&lseg->pls_refcount), test_bit(NFS_LSEG_VALID, &lseg->pls_flags)); lo = lseg->pls_layout; inode = lo->plh_inode; if (refcount_dec_and_lock(&lseg->pls_refcount, &inode->i_lock)) { if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags)) { spin_unlock(&inode->i_lock); return; } pnfs_get_layout_hdr(lo); pnfs_layout_remove_lseg(lo, lseg); if (pnfs_cache_lseg_for_layoutreturn(lo, lseg)) lseg = NULL; spin_unlock(&inode->i_lock); pnfs_free_lseg(lseg); pnfs_put_layout_hdr(lo); } } EXPORT_SYMBOL_GPL(pnfs_put_lseg); /* * is l2 fully contained in l1? * start1 end1 * [----------------------------------) * start2 end2 * [----------------) */ static bool pnfs_lseg_range_contained(const struct pnfs_layout_range *l1, const struct pnfs_layout_range *l2) { u64 start1 = l1->offset; u64 end1 = pnfs_end_offset(start1, l1->length); u64 start2 = l2->offset; u64 end2 = pnfs_end_offset(start2, l2->length); return (start1 <= start2) && (end1 >= end2); } static bool pnfs_lseg_dec_and_remove_zero(struct pnfs_layout_segment *lseg, struct list_head *tmp_list) { if (!refcount_dec_and_test(&lseg->pls_refcount)) return false; pnfs_layout_remove_lseg(lseg->pls_layout, lseg); list_add(&lseg->pls_list, tmp_list); return true; } /* Returns 1 if lseg is removed from list, 0 otherwise */ static int mark_lseg_invalid(struct pnfs_layout_segment *lseg, struct list_head *tmp_list) { int rv = 0; if (test_and_clear_bit(NFS_LSEG_VALID, &lseg->pls_flags)) { /* Remove the reference keeping the lseg in the * list. It will now be removed when all * outstanding io is finished. */ dprintk("%s: lseg %p ref %d\n", __func__, lseg, refcount_read(&lseg->pls_refcount)); if (pnfs_lseg_dec_and_remove_zero(lseg, tmp_list)) rv = 1; } return rv; } /* * Compare 2 layout stateid sequence ids, to see which is newer, * taking into account wraparound issues. */ static bool pnfs_seqid_is_newer(u32 s1, u32 s2) { return (s32)(s1 - s2) > 0; } static bool pnfs_should_free_range(const struct pnfs_layout_range *lseg_range, const struct pnfs_layout_range *recall_range) { return (recall_range->iomode == IOMODE_ANY || lseg_range->iomode == recall_range->iomode) && pnfs_lseg_range_intersecting(lseg_range, recall_range); } static bool pnfs_match_lseg_recall(const struct pnfs_layout_segment *lseg, const struct pnfs_layout_range *recall_range, u32 seq) { if (seq != 0 && pnfs_seqid_is_newer(lseg->pls_seq, seq)) return false; if (recall_range == NULL) return true; return pnfs_should_free_range(&lseg->pls_range, recall_range); } /** * pnfs_mark_matching_lsegs_invalid - tear down lsegs or mark them for later * @lo: layout header containing the lsegs * @tmp_list: list head where doomed lsegs should go * @recall_range: optional recall range argument to match (may be NULL) * @seq: only invalidate lsegs obtained prior to this sequence (may be 0) * * Walk the list of lsegs in the layout header, and tear down any that should * be destroyed. If "recall_range" is specified then the segment must match * that range. If "seq" is non-zero, then only match segments that were handed * out at or before that sequence. * * Returns number of matching invalid lsegs remaining in list after scanning * it and purging them. */ int pnfs_mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo, struct list_head *tmp_list, const struct pnfs_layout_range *recall_range, u32 seq) { struct pnfs_layout_segment *lseg, *next; int remaining = 0; dprintk("%s:Begin lo %p\n", __func__, lo); if (list_empty(&lo->plh_segs)) return 0; list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list) if (pnfs_match_lseg_recall(lseg, recall_range, seq)) { dprintk("%s: freeing lseg %p iomode %d seq %u " "offset %llu length %llu\n", __func__, lseg, lseg->pls_range.iomode, lseg->pls_seq, lseg->pls_range.offset, lseg->pls_range.length); if (!mark_lseg_invalid(lseg, tmp_list)) remaining++; } dprintk("%s:Return %i\n", __func__, remaining); return remaining; } static void pnfs_free_returned_lsegs(struct pnfs_layout_hdr *lo, struct list_head *free_me, const struct pnfs_layout_range *range, u32 seq) { struct pnfs_layout_segment *lseg, *next; list_for_each_entry_safe(lseg, next, &lo->plh_return_segs, pls_list) { if (pnfs_match_lseg_recall(lseg, range, seq)) list_move_tail(&lseg->pls_list, free_me); } } /* note free_me must contain lsegs from a single layout_hdr */ void pnfs_free_lseg_list(struct list_head *free_me) { struct pnfs_layout_segment *lseg, *tmp; if (list_empty(free_me)) return; list_for_each_entry_safe(lseg, tmp, free_me, pls_list) { list_del(&lseg->pls_list); pnfs_free_lseg(lseg); } } void pnfs_destroy_layout(struct nfs_inode *nfsi) { struct pnfs_layout_hdr *lo; LIST_HEAD(tmp_list); spin_lock(&nfsi->vfs_inode.i_lock); lo = nfsi->layout; if (lo) { pnfs_get_layout_hdr(lo); pnfs_mark_layout_stateid_invalid(lo, &tmp_list); pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RO_FAILED); pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RW_FAILED); spin_unlock(&nfsi->vfs_inode.i_lock); pnfs_free_lseg_list(&tmp_list); nfs_commit_inode(&nfsi->vfs_inode, 0); pnfs_put_layout_hdr(lo); } else spin_unlock(&nfsi->vfs_inode.i_lock); } EXPORT_SYMBOL_GPL(pnfs_destroy_layout); static bool pnfs_layout_add_bulk_destroy_list(struct inode *inode, struct list_head *layout_list) { struct pnfs_layout_hdr *lo; bool ret = false; spin_lock(&inode->i_lock); lo = NFS_I(inode)->layout; if (lo != NULL && list_empty(&lo->plh_bulk_destroy)) { pnfs_get_layout_hdr(lo); list_add(&lo->plh_bulk_destroy, layout_list); ret = true; } spin_unlock(&inode->i_lock); return ret; } /* Caller must hold rcu_read_lock and clp->cl_lock */ static int pnfs_layout_bulk_destroy_byserver_locked(struct nfs_client *clp, struct nfs_server *server, struct list_head *layout_list) __must_hold(&clp->cl_lock) __must_hold(RCU) { struct pnfs_layout_hdr *lo, *next; struct inode *inode; list_for_each_entry_safe(lo, next, &server->layouts, plh_layouts) { if (test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) || test_bit(NFS_LAYOUT_INODE_FREEING, &lo->plh_flags) || !list_empty(&lo->plh_bulk_destroy)) continue; /* If the sb is being destroyed, just bail */ if (!nfs_sb_active(server->super)) break; inode = igrab(lo->plh_inode); if (inode != NULL) { list_del_init(&lo->plh_layouts); if (pnfs_layout_add_bulk_destroy_list(inode, layout_list)) continue; rcu_read_unlock(); spin_unlock(&clp->cl_lock); iput(inode); } else { rcu_read_unlock(); spin_unlock(&clp->cl_lock); set_bit(NFS_LAYOUT_INODE_FREEING, &lo->plh_flags); } nfs_sb_deactive(server->super); spin_lock(&clp->cl_lock); rcu_read_lock(); return -EAGAIN; } return 0; } static int pnfs_layout_free_bulk_destroy_list(struct list_head *layout_list, bool is_bulk_recall) { struct pnfs_layout_hdr *lo; struct inode *inode; LIST_HEAD(lseg_list); int ret = 0; while (!list_empty(layout_list)) { lo = list_entry(layout_list->next, struct pnfs_layout_hdr, plh_bulk_destroy); dprintk("%s freeing layout for inode %lu\n", __func__, lo->plh_inode->i_ino); inode = lo->plh_inode; pnfs_layoutcommit_inode(inode, false); spin_lock(&inode->i_lock); list_del_init(&lo->plh_bulk_destroy); if (pnfs_mark_layout_stateid_invalid(lo, &lseg_list)) { if (is_bulk_recall) set_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags); ret = -EAGAIN; } spin_unlock(&inode->i_lock); pnfs_free_lseg_list(&lseg_list); /* Free all lsegs that are attached to commit buckets */ nfs_commit_inode(inode, 0); pnfs_put_layout_hdr(lo); nfs_iput_and_deactive(inode); } return ret; } int pnfs_destroy_layouts_byfsid(struct nfs_client *clp, struct nfs_fsid *fsid, bool is_recall) { struct nfs_server *server; LIST_HEAD(layout_list); spin_lock(&clp->cl_lock); rcu_read_lock(); restart: list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { if (memcmp(&server->fsid, fsid, sizeof(*fsid)) != 0) continue; if (pnfs_layout_bulk_destroy_byserver_locked(clp, server, &layout_list) != 0) goto restart; } rcu_read_unlock(); spin_unlock(&clp->cl_lock); if (list_empty(&layout_list)) return 0; return pnfs_layout_free_bulk_destroy_list(&layout_list, is_recall); } int pnfs_destroy_layouts_byclid(struct nfs_client *clp, bool is_recall) { struct nfs_server *server; LIST_HEAD(layout_list); spin_lock(&clp->cl_lock); rcu_read_lock(); restart: list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { if (pnfs_layout_bulk_destroy_byserver_locked(clp, server, &layout_list) != 0) goto restart; } rcu_read_unlock(); spin_unlock(&clp->cl_lock); if (list_empty(&layout_list)) return 0; return pnfs_layout_free_bulk_destroy_list(&layout_list, is_recall); } /* * Called by the state manger to remove all layouts established under an * expired lease. */ void pnfs_destroy_all_layouts(struct nfs_client *clp) { nfs4_deviceid_mark_client_invalid(clp); nfs4_deviceid_purge_client(clp); pnfs_destroy_layouts_byclid(clp, false); } static void pnfs_set_layout_cred(struct pnfs_layout_hdr *lo, const struct cred *cred) { const struct cred *old; if (cred && cred_fscmp(lo->plh_lc_cred, cred) != 0) { old = xchg(&lo->plh_lc_cred, get_cred(cred)); put_cred(old); } } /* update lo->plh_stateid with new if is more recent */ void pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo, const nfs4_stateid *new, const struct cred *cred, bool update_barrier) { u32 oldseq, newseq, new_barrier = 0; oldseq = be32_to_cpu(lo->plh_stateid.seqid); newseq = be32_to_cpu(new->seqid); if (!pnfs_layout_is_valid(lo)) { pnfs_set_layout_cred(lo, cred); nfs4_stateid_copy(&lo->plh_stateid, new); lo->plh_barrier = newseq; pnfs_clear_layoutreturn_info(lo); clear_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags); return; } if (pnfs_seqid_is_newer(newseq, oldseq)) { nfs4_stateid_copy(&lo->plh_stateid, new); /* * Because of wraparound, we want to keep the barrier * "close" to the current seqids. */ new_barrier = newseq - atomic_read(&lo->plh_outstanding); } if (update_barrier) new_barrier = be32_to_cpu(new->seqid); else if (new_barrier == 0) return; if (pnfs_seqid_is_newer(new_barrier, lo->plh_barrier)) lo->plh_barrier = new_barrier; } static bool pnfs_layout_stateid_blocked(const struct pnfs_layout_hdr *lo, const nfs4_stateid *stateid) { u32 seqid = be32_to_cpu(stateid->seqid); return !pnfs_seqid_is_newer(seqid, lo->plh_barrier); } /* lget is set to 1 if called from inside send_layoutget call chain */ static bool pnfs_layoutgets_blocked(const struct pnfs_layout_hdr *lo) { return lo->plh_block_lgets || test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags); } static struct nfs_server * pnfs_find_server(struct inode *inode, struct nfs_open_context *ctx) { struct nfs_server *server; if (inode) { server = NFS_SERVER(inode); } else { struct dentry *parent_dir = dget_parent(ctx->dentry); server = NFS_SERVER(parent_dir->d_inode); dput(parent_dir); } return server; } static void nfs4_free_pages(struct page **pages, size_t size) { int i; if (!pages) return; for (i = 0; i < size; i++) { if (!pages[i]) break; __free_page(pages[i]); } kfree(pages); } static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags) { struct page **pages; int i; pages = kmalloc_array(size, sizeof(struct page *), gfp_flags); if (!pages) { dprintk("%s: can't alloc array of %zu pages\n", __func__, size); return NULL; } for (i = 0; i < size; i++) { pages[i] = alloc_page(gfp_flags); if (!pages[i]) { dprintk("%s: failed to allocate page\n", __func__); nfs4_free_pages(pages, i); return NULL; } } return pages; } static struct nfs4_layoutget * pnfs_alloc_init_layoutget_args(struct inode *ino, struct nfs_open_context *ctx, const nfs4_stateid *stateid, const struct pnfs_layout_range *range, gfp_t gfp_flags) { struct nfs_server *server = pnfs_find_server(ino, ctx); size_t max_reply_sz = server->pnfs_curr_ld->max_layoutget_response; size_t max_pages = max_response_pages(server); struct nfs4_layoutget *lgp; dprintk("--> %s\n", __func__); lgp = kzalloc(sizeof(*lgp), gfp_flags); if (lgp == NULL) return NULL; if (max_reply_sz) { size_t npages = (max_reply_sz + PAGE_SIZE - 1) >> PAGE_SHIFT; if (npages < max_pages) max_pages = npages; } lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags); if (!lgp->args.layout.pages) { kfree(lgp); return NULL; } lgp->args.layout.pglen = max_pages * PAGE_SIZE; lgp->res.layoutp = &lgp->args.layout; /* Don't confuse uninitialised result and success */ lgp->res.status = -NFS4ERR_DELAY; lgp->args.minlength = PAGE_SIZE; if (lgp->args.minlength > range->length) lgp->args.minlength = range->length; if (ino) { loff_t i_size = i_size_read(ino); if (range->iomode == IOMODE_READ) { if (range->offset >= i_size) lgp->args.minlength = 0; else if (i_size - range->offset < lgp->args.minlength) lgp->args.minlength = i_size - range->offset; } } lgp->args.maxcount = PNFS_LAYOUT_MAXSIZE; pnfs_copy_range(&lgp->args.range, range); lgp->args.type = server->pnfs_curr_ld->id; lgp->args.inode = ino; lgp->args.ctx = get_nfs_open_context(ctx); nfs4_stateid_copy(&lgp->args.stateid, stateid); lgp->gfp_flags = gfp_flags; lgp->cred = get_cred(ctx->cred); return lgp; } void pnfs_layoutget_free(struct nfs4_layoutget *lgp) { size_t max_pages = lgp->args.layout.pglen / PAGE_SIZE; nfs4_free_pages(lgp->args.layout.pages, max_pages); if (lgp->args.inode) pnfs_put_layout_hdr(NFS_I(lgp->args.inode)->layout); put_cred(lgp->cred); put_nfs_open_context(lgp->args.ctx); kfree(lgp); } static void pnfs_clear_layoutcommit(struct inode *inode, struct list_head *head) { struct nfs_inode *nfsi = NFS_I(inode); struct pnfs_layout_segment *lseg, *tmp; if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) return; list_for_each_entry_safe(lseg, tmp, &nfsi->layout->plh_segs, pls_list) { if (!test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags)) continue; pnfs_lseg_dec_and_remove_zero(lseg, head); } } void pnfs_layoutreturn_free_lsegs(struct pnfs_layout_hdr *lo, const nfs4_stateid *arg_stateid, const struct pnfs_layout_range *range, const nfs4_stateid *stateid) { struct inode *inode = lo->plh_inode; LIST_HEAD(freeme); spin_lock(&inode->i_lock); if (!pnfs_layout_is_valid(lo) || !arg_stateid || !nfs4_stateid_match_other(&lo->plh_stateid, arg_stateid)) goto out_unlock; if (stateid) { u32 seq = be32_to_cpu(arg_stateid->seqid); pnfs_mark_matching_lsegs_invalid(lo, &freeme, range, seq); pnfs_free_returned_lsegs(lo, &freeme, range, seq); pnfs_set_layout_stateid(lo, stateid, NULL, true); } else pnfs_mark_layout_stateid_invalid(lo, &freeme); out_unlock: pnfs_clear_layoutreturn_waitbit(lo); spin_unlock(&inode->i_lock); pnfs_free_lseg_list(&freeme); } static bool pnfs_prepare_layoutreturn(struct pnfs_layout_hdr *lo, nfs4_stateid *stateid, enum pnfs_iomode *iomode) { /* Serialise LAYOUTGET/LAYOUTRETURN */ if (atomic_read(&lo->plh_outstanding) != 0) return false; if (test_and_set_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags)) return false; set_bit(NFS_LAYOUT_RETURN, &lo->plh_flags); pnfs_get_layout_hdr(lo); if (test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags)) { if (stateid != NULL) { nfs4_stateid_copy(stateid, &lo->plh_stateid); if (lo->plh_return_seq != 0) stateid->seqid = cpu_to_be32(lo->plh_return_seq); } if (iomode != NULL) *iomode = lo->plh_return_iomode; pnfs_clear_layoutreturn_info(lo); return true; } if (stateid != NULL) nfs4_stateid_copy(stateid, &lo->plh_stateid); if (iomode != NULL) *iomode = IOMODE_ANY; return true; } static void pnfs_init_layoutreturn_args(struct nfs4_layoutreturn_args *args, struct pnfs_layout_hdr *lo, const nfs4_stateid *stateid, enum pnfs_iomode iomode) { struct inode *inode = lo->plh_inode; args->layout_type = NFS_SERVER(inode)->pnfs_curr_ld->id; args->inode = inode; args->range.iomode = iomode; args->range.offset = 0; args->range.length = NFS4_MAX_UINT64; args->layout = lo; nfs4_stateid_copy(&args->stateid, stateid); } static int pnfs_send_layoutreturn(struct pnfs_layout_hdr *lo, const nfs4_stateid *stateid, enum pnfs_iomode iomode, bool sync) { struct inode *ino = lo->plh_inode; struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld; struct nfs4_layoutreturn *lrp; int status = 0; lrp = kzalloc(sizeof(*lrp), GFP_NOFS); if (unlikely(lrp == NULL)) { status = -ENOMEM; spin_lock(&ino->i_lock); pnfs_clear_layoutreturn_waitbit(lo); spin_unlock(&ino->i_lock); pnfs_put_layout_hdr(lo); goto out; } pnfs_init_layoutreturn_args(&lrp->args, lo, stateid, iomode); lrp->args.ld_private = &lrp->ld_private; lrp->clp = NFS_SERVER(ino)->nfs_client; lrp->cred = lo->plh_lc_cred; if (ld->prepare_layoutreturn) ld->prepare_layoutreturn(&lrp->args); status = nfs4_proc_layoutreturn(lrp, sync); out: dprintk("<-- %s status: %d\n", __func__, status); return status; } /* Return true if layoutreturn is needed */ static bool pnfs_layout_need_return(struct pnfs_layout_hdr *lo) { struct pnfs_layout_segment *s; enum pnfs_iomode iomode; u32 seq; if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags)) return false; seq = lo->plh_return_seq; iomode = lo->plh_return_iomode; /* Defer layoutreturn until all recalled lsegs are done */ list_for_each_entry(s, &lo->plh_segs, pls_list) { if (seq && pnfs_seqid_is_newer(s->pls_seq, seq)) continue; if (iomode != IOMODE_ANY && s->pls_range.iomode != iomode) continue; if (test_bit(NFS_LSEG_LAYOUTRETURN, &s->pls_flags)) return false; } return true; } static void pnfs_layoutreturn_before_put_layout_hdr(struct pnfs_layout_hdr *lo) { struct inode *inode= lo->plh_inode; if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags)) return; spin_lock(&inode->i_lock); if (pnfs_layout_need_return(lo)) { nfs4_stateid stateid; enum pnfs_iomode iomode; bool send; send = pnfs_prepare_layoutreturn(lo, &stateid, &iomode); spin_unlock(&inode->i_lock); if (send) { /* Send an async layoutreturn so we dont deadlock */ pnfs_send_layoutreturn(lo, &stateid, iomode, false); } } else spin_unlock(&inode->i_lock); } /* * Initiates a LAYOUTRETURN(FILE), and removes the pnfs_layout_hdr * when the layout segment list is empty. * * Note that a pnfs_layout_hdr can exist with an empty layout segment * list when LAYOUTGET has failed, or when LAYOUTGET succeeded, but the * deviceid is marked invalid. */ int _pnfs_return_layout(struct inode *ino) { struct pnfs_layout_hdr *lo = NULL; struct nfs_inode *nfsi = NFS_I(ino); LIST_HEAD(tmp_list); nfs4_stateid stateid; int status = 0; bool send, valid_layout; dprintk("NFS: %s for inode %lu\n", __func__, ino->i_ino); spin_lock(&ino->i_lock); lo = nfsi->layout; if (!lo) { spin_unlock(&ino->i_lock); dprintk("NFS: %s no layout to return\n", __func__); goto out; } /* Reference matched in nfs4_layoutreturn_release */ pnfs_get_layout_hdr(lo); /* Is there an outstanding layoutreturn ? */ if (test_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags)) { spin_unlock(&ino->i_lock); if (wait_on_bit(&lo->plh_flags, NFS_LAYOUT_RETURN, TASK_UNINTERRUPTIBLE)) goto out_put_layout_hdr; spin_lock(&ino->i_lock); } valid_layout = pnfs_layout_is_valid(lo); pnfs_clear_layoutcommit(ino, &tmp_list); pnfs_mark_matching_lsegs_invalid(lo, &tmp_list, NULL, 0); if (NFS_SERVER(ino)->pnfs_curr_ld->return_range) { struct pnfs_layout_range range = { .iomode = IOMODE_ANY, .offset = 0, .length = NFS4_MAX_UINT64, }; NFS_SERVER(ino)->pnfs_curr_ld->return_range(lo, &range); } /* Don't send a LAYOUTRETURN if list was initially empty */ if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags) || !valid_layout) { spin_unlock(&ino->i_lock); dprintk("NFS: %s no layout segments to return\n", __func__); goto out_put_layout_hdr; } send = pnfs_prepare_layoutreturn(lo, &stateid, NULL); spin_unlock(&ino->i_lock); if (send) status = pnfs_send_layoutreturn(lo, &stateid, IOMODE_ANY, true); out_put_layout_hdr: pnfs_free_lseg_list(&tmp_list); pnfs_put_layout_hdr(lo); out: dprintk("<-- %s status: %d\n", __func__, status); return status; } int pnfs_commit_and_return_layout(struct inode *inode) { struct pnfs_layout_hdr *lo; int ret; spin_lock(&inode->i_lock); lo = NFS_I(inode)->layout; if (lo == NULL) { spin_unlock(&inode->i_lock); return 0; } pnfs_get_layout_hdr(lo); /* Block new layoutgets and read/write to ds */ lo->plh_block_lgets++; spin_unlock(&inode->i_lock); filemap_fdatawait(inode->i_mapping); ret = pnfs_layoutcommit_inode(inode, true); if (ret == 0) ret = _pnfs_return_layout(inode); spin_lock(&inode->i_lock); lo->plh_block_lgets--; spin_unlock(&inode->i_lock); pnfs_put_layout_hdr(lo); return ret; } bool pnfs_roc(struct inode *ino, struct nfs4_layoutreturn_args *args, struct nfs4_layoutreturn_res *res, const struct cred *cred) { struct nfs_inode *nfsi = NFS_I(ino); struct nfs_open_context *ctx; struct nfs4_state *state; struct pnfs_layout_hdr *lo; struct pnfs_layout_segment *lseg, *next; nfs4_stateid stateid; enum pnfs_iomode iomode = 0; bool layoutreturn = false, roc = false; bool skip_read = false; if (!nfs_have_layout(ino)) return false; retry: rcu_read_lock(); spin_lock(&ino->i_lock); lo = nfsi->layout; if (!lo || !pnfs_layout_is_valid(lo) || test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) { lo = NULL; goto out_noroc; } pnfs_get_layout_hdr(lo); if (test_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags)) { spin_unlock(&ino->i_lock); rcu_read_unlock(); wait_on_bit(&lo->plh_flags, NFS_LAYOUT_RETURN, TASK_UNINTERRUPTIBLE); pnfs_put_layout_hdr(lo); goto retry; } /* no roc if we hold a delegation */ if (nfs4_check_delegation(ino, FMODE_READ)) { if (nfs4_check_delegation(ino, FMODE_WRITE)) goto out_noroc; skip_read = true; } list_for_each_entry_rcu(ctx, &nfsi->open_files, list) { state = ctx->state; if (state == NULL) continue; /* Don't return layout if there is open file state */ if (state->state & FMODE_WRITE) goto out_noroc; if (state->state & FMODE_READ) skip_read = true; } list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list) { if (skip_read && lseg->pls_range.iomode == IOMODE_READ) continue; /* If we are sending layoutreturn, invalidate all valid lsegs */ if (!test_and_clear_bit(NFS_LSEG_ROC, &lseg->pls_flags)) continue; /* * Note: mark lseg for return so pnfs_layout_remove_lseg * doesn't invalidate the layout for us. */ set_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags); if (!mark_lseg_invalid(lseg, &lo->plh_return_segs)) continue; pnfs_set_plh_return_info(lo, lseg->pls_range.iomode, 0); } if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags)) goto out_noroc; /* ROC in two conditions: * 1. there are ROC lsegs * 2. we don't send layoutreturn */ /* lo ref dropped in pnfs_roc_release() */ layoutreturn = pnfs_prepare_layoutreturn(lo, &stateid, &iomode); /* If the creds don't match, we can't compound the layoutreturn */ if (!layoutreturn || cred_fscmp(cred, lo->plh_lc_cred) != 0) goto out_noroc; roc = layoutreturn; pnfs_init_layoutreturn_args(args, lo, &stateid, iomode); res->lrs_present = 0; layoutreturn = false; out_noroc: spin_unlock(&ino->i_lock); rcu_read_unlock(); pnfs_layoutcommit_inode(ino, true); if (roc) { struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld; if (ld->prepare_layoutreturn) ld->prepare_layoutreturn(args); pnfs_put_layout_hdr(lo); return true; } if (layoutreturn) pnfs_send_layoutreturn(lo, &stateid, iomode, true); pnfs_put_layout_hdr(lo); return false; } int pnfs_roc_done(struct rpc_task *task, struct inode *inode, struct nfs4_layoutreturn_args **argpp, struct nfs4_layoutreturn_res **respp, int *ret) { struct nfs4_layoutreturn_args *arg = *argpp; int retval = -EAGAIN; if (!arg) return 0; /* Handle Layoutreturn errors */ switch (*ret) { case 0: retval = 0; break; case -NFS4ERR_NOMATCHING_LAYOUT: /* Was there an RPC level error? If not, retry */ if (task->tk_rpc_status == 0) break; /* If the call was not sent, let caller handle it */ if (!RPC_WAS_SENT(task)) return 0; /* * Otherwise, assume the call succeeded and * that we need to release the layout */ *ret = 0; (*respp)->lrs_present = 0; retval = 0; break; case -NFS4ERR_DELAY: /* Let the caller handle the retry */ *ret = -NFS4ERR_NOMATCHING_LAYOUT; return 0; case -NFS4ERR_OLD_STATEID: if (!nfs4_layout_refresh_old_stateid(&arg->stateid, &arg->range, inode)) break; *ret = -NFS4ERR_NOMATCHING_LAYOUT; return -EAGAIN; } *argpp = NULL; *respp = NULL; return retval; } void pnfs_roc_release(struct nfs4_layoutreturn_args *args, struct nfs4_layoutreturn_res *res, int ret) { struct pnfs_layout_hdr *lo = args->layout; const nfs4_stateid *arg_stateid = NULL; const nfs4_stateid *res_stateid = NULL; struct nfs4_xdr_opaque_data *ld_private = args->ld_private; switch (ret) { case -NFS4ERR_NOMATCHING_LAYOUT: break; case 0: if (res->lrs_present) res_stateid = &res->stateid; /* Fallthrough */ default: arg_stateid = &args->stateid; } pnfs_layoutreturn_free_lsegs(lo, arg_stateid, &args->range, res_stateid); if (ld_private && ld_private->ops && ld_private->ops->free) ld_private->ops->free(ld_private); pnfs_put_layout_hdr(lo); trace_nfs4_layoutreturn_on_close(args->inode, 0); } bool pnfs_wait_on_layoutreturn(struct inode *ino, struct rpc_task *task) { struct nfs_inode *nfsi = NFS_I(ino); struct pnfs_layout_hdr *lo; bool sleep = false; /* we might not have grabbed lo reference. so need to check under * i_lock */ spin_lock(&ino->i_lock); lo = nfsi->layout; if (lo && test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) { rpc_sleep_on(&NFS_SERVER(ino)->roc_rpcwaitq, task, NULL); sleep = true; } spin_unlock(&ino->i_lock); return sleep; } /* * Compare two layout segments for sorting into layout cache. * We want to preferentially return RW over RO layouts, so ensure those * are seen first. */ static s64 pnfs_lseg_range_cmp(const struct pnfs_layout_range *l1, const struct pnfs_layout_range *l2) { s64 d; /* high offset > low offset */ d = l1->offset - l2->offset; if (d) return d; /* short length > long length */ d = l2->length - l1->length; if (d) return d; /* read > read/write */ return (int)(l1->iomode == IOMODE_READ) - (int)(l2->iomode == IOMODE_READ); } static bool pnfs_lseg_range_is_after(const struct pnfs_layout_range *l1, const struct pnfs_layout_range *l2) { return pnfs_lseg_range_cmp(l1, l2) > 0; } static bool pnfs_lseg_no_merge(struct pnfs_layout_segment *lseg, struct pnfs_layout_segment *old) { return false; } void pnfs_generic_layout_insert_lseg(struct pnfs_layout_hdr *lo, struct pnfs_layout_segment *lseg, bool (*is_after)(const struct pnfs_layout_range *, const struct pnfs_layout_range *), bool (*do_merge)(struct pnfs_layout_segment *, struct pnfs_layout_segment *), struct list_head *free_me) { struct pnfs_layout_segment *lp, *tmp; dprintk("%s:Begin\n", __func__); list_for_each_entry_safe(lp, tmp, &lo->plh_segs, pls_list) { if (test_bit(NFS_LSEG_VALID, &lp->pls_flags) == 0) continue; if (do_merge(lseg, lp)) { mark_lseg_invalid(lp, free_me); continue; } if (is_after(&lseg->pls_range, &lp->pls_range)) continue; list_add_tail(&lseg->pls_list, &lp->pls_list); dprintk("%s: inserted lseg %p " "iomode %d offset %llu length %llu before " "lp %p iomode %d offset %llu length %llu\n", __func__, lseg, lseg->pls_range.iomode, lseg->pls_range.offset, lseg->pls_range.length, lp, lp->pls_range.iomode, lp->pls_range.offset, lp->pls_range.length); goto out; } list_add_tail(&lseg->pls_list, &lo->plh_segs); dprintk("%s: inserted lseg %p " "iomode %d offset %llu length %llu at tail\n", __func__, lseg, lseg->pls_range.iomode, lseg->pls_range.offset, lseg->pls_range.length); out: pnfs_get_layout_hdr(lo); dprintk("%s:Return\n", __func__); } EXPORT_SYMBOL_GPL(pnfs_generic_layout_insert_lseg); static void pnfs_layout_insert_lseg(struct pnfs_layout_hdr *lo, struct pnfs_layout_segment *lseg, struct list_head *free_me) { struct inode *inode = lo->plh_inode; struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld; if (ld->add_lseg != NULL) ld->add_lseg(lo, lseg, free_me); else pnfs_generic_layout_insert_lseg(lo, lseg, pnfs_lseg_range_is_after, pnfs_lseg_no_merge, free_me); } static struct pnfs_layout_hdr * alloc_init_layout_hdr(struct inode *ino, struct nfs_open_context *ctx, gfp_t gfp_flags) { struct pnfs_layout_hdr *lo; lo = pnfs_alloc_layout_hdr(ino, gfp_flags); if (!lo) return NULL; refcount_set(&lo->plh_refcount, 1); INIT_LIST_HEAD(&lo->plh_layouts); INIT_LIST_HEAD(&lo->plh_segs); INIT_LIST_HEAD(&lo->plh_return_segs); INIT_LIST_HEAD(&lo->plh_bulk_destroy); lo->plh_inode = ino; lo->plh_lc_cred = get_cred(ctx->cred); lo->plh_flags |= 1 << NFS_LAYOUT_INVALID_STID; return lo; } static struct pnfs_layout_hdr * pnfs_find_alloc_layout(struct inode *ino, struct nfs_open_context *ctx, gfp_t gfp_flags) __releases(&ino->i_lock) __acquires(&ino->i_lock) { struct nfs_inode *nfsi = NFS_I(ino); struct pnfs_layout_hdr *new = NULL; dprintk("%s Begin ino=%p layout=%p\n", __func__, ino, nfsi->layout); if (nfsi->layout != NULL) goto out_existing; spin_unlock(&ino->i_lock); new = alloc_init_layout_hdr(ino, ctx, gfp_flags); spin_lock(&ino->i_lock); if (likely(nfsi->layout == NULL)) { /* Won the race? */ nfsi->layout = new; return new; } else if (new != NULL) pnfs_free_layout_hdr(new); out_existing: pnfs_get_layout_hdr(nfsi->layout); return nfsi->layout; } /* * iomode matching rules: * iomode lseg strict match * iomode * ----- ----- ------ ----- * ANY READ N/A true * ANY RW N/A true * RW READ N/A false * RW RW N/A true * READ READ N/A true * READ RW true false * READ RW false true */ static bool pnfs_lseg_range_match(const struct pnfs_layout_range *ls_range, const struct pnfs_layout_range *range, bool strict_iomode) { struct pnfs_layout_range range1; if ((range->iomode == IOMODE_RW && ls_range->iomode != IOMODE_RW) || (range->iomode != ls_range->iomode && strict_iomode) || !pnfs_lseg_range_intersecting(ls_range, range)) return false; /* range1 covers only the first byte in the range */ range1 = *range; range1.length = 1; return pnfs_lseg_range_contained(ls_range, &range1); } /* * lookup range in layout */ static struct pnfs_layout_segment * pnfs_find_lseg(struct pnfs_layout_hdr *lo, struct pnfs_layout_range *range, bool strict_iomode) { struct pnfs_layout_segment *lseg, *ret = NULL; dprintk("%s:Begin\n", __func__); list_for_each_entry(lseg, &lo->plh_segs, pls_list) { if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags) && pnfs_lseg_range_match(&lseg->pls_range, range, strict_iomode)) { ret = pnfs_get_lseg(lseg); break; } } dprintk("%s:Return lseg %p ref %d\n", __func__, ret, ret ? refcount_read(&ret->pls_refcount) : 0); return ret; } /* * Use mdsthreshold hints set at each OPEN to determine if I/O should go * to the MDS or over pNFS * * The nfs_inode read_io and write_io fields are cumulative counters reset * when there are no layout segments. Note that in pnfs_update_layout iomode * is set to IOMODE_READ for a READ request, and set to IOMODE_RW for a * WRITE request. * * A return of true means use MDS I/O. * * From rfc 5661: * If a file's size is smaller than the file size threshold, data accesses * SHOULD be sent to the metadata server. If an I/O request has a length that * is below the I/O size threshold, the I/O SHOULD be sent to the metadata * server. If both file size and I/O size are provided, the client SHOULD * reach or exceed both thresholds before sending its read or write * requests to the data server. */ static bool pnfs_within_mdsthreshold(struct nfs_open_context *ctx, struct inode *ino, int iomode) { struct nfs4_threshold *t = ctx->mdsthreshold; struct nfs_inode *nfsi = NFS_I(ino); loff_t fsize = i_size_read(ino); bool size = false, size_set = false, io = false, io_set = false, ret = false; if (t == NULL) return ret; dprintk("%s bm=0x%x rd_sz=%llu wr_sz=%llu rd_io=%llu wr_io=%llu\n", __func__, t->bm, t->rd_sz, t->wr_sz, t->rd_io_sz, t->wr_io_sz); switch (iomode) { case IOMODE_READ: if (t->bm & THRESHOLD_RD) { dprintk("%s fsize %llu\n", __func__, fsize); size_set = true; if (fsize < t->rd_sz) size = true; } if (t->bm & THRESHOLD_RD_IO) { dprintk("%s nfsi->read_io %llu\n", __func__, nfsi->read_io); io_set = true; if (nfsi->read_io < t->rd_io_sz) io = true; } break; case IOMODE_RW: if (t->bm & THRESHOLD_WR) { dprintk("%s fsize %llu\n", __func__, fsize); size_set = true; if (fsize < t->wr_sz) size = true; } if (t->bm & THRESHOLD_WR_IO) { dprintk("%s nfsi->write_io %llu\n", __func__, nfsi->write_io); io_set = true; if (nfsi->write_io < t->wr_io_sz) io = true; } break; } if (size_set && io_set) { if (size && io) ret = true; } else if (size || io) ret = true; dprintk("<-- %s size %d io %d ret %d\n", __func__, size, io, ret); return ret; } static int pnfs_prepare_to_retry_layoutget(struct pnfs_layout_hdr *lo) { /* * send layoutcommit as it can hold up layoutreturn due to lseg * reference */ pnfs_layoutcommit_inode(lo->plh_inode, false); return wait_on_bit_action(&lo->plh_flags, NFS_LAYOUT_RETURN, nfs_wait_bit_killable, TASK_KILLABLE); } static void nfs_layoutget_begin(struct pnfs_layout_hdr *lo) { atomic_inc(&lo->plh_outstanding); } static void nfs_layoutget_end(struct pnfs_layout_hdr *lo) { if (atomic_dec_and_test(&lo->plh_outstanding)) wake_up_var(&lo->plh_outstanding); } static void pnfs_clear_first_layoutget(struct pnfs_layout_hdr *lo) { unsigned long *bitlock = &lo->plh_flags; clear_bit_unlock(NFS_LAYOUT_FIRST_LAYOUTGET, bitlock); smp_mb__after_atomic(); wake_up_bit(bitlock, NFS_LAYOUT_FIRST_LAYOUTGET); } static void _add_to_server_list(struct pnfs_layout_hdr *lo, struct nfs_server *server) { if (list_empty(&lo->plh_layouts)) { struct nfs_client *clp = server->nfs_client; /* The lo must be on the clp list if there is any * chance of a CB_LAYOUTRECALL(FILE) coming in. */ spin_lock(&clp->cl_lock); if (list_empty(&lo->plh_layouts)) list_add_tail(&lo->plh_layouts, &server->layouts); spin_unlock(&clp->cl_lock); } } /* * Layout segment is retreived from the server if not cached. * The appropriate layout segment is referenced and returned to the caller. */ struct pnfs_layout_segment * 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_range arg = { .iomode = iomode, .offset = pos, .length = count, }; unsigned pg_offset; struct nfs_server *server = NFS_SERVER(ino); struct nfs_client *clp = server->nfs_client; struct pnfs_layout_hdr *lo = NULL; struct pnfs_layout_segment *lseg = NULL; struct nfs4_layoutget *lgp; nfs4_stateid stateid; long timeout = 0; unsigned long giveup = jiffies + (clp->cl_lease_time << 1); bool first; if (!pnfs_enabled_sb(NFS_SERVER(ino))) { trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, PNFS_UPDATE_LAYOUT_NO_PNFS); goto out; } if (pnfs_within_mdsthreshold(ctx, ino, iomode)) { trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, PNFS_UPDATE_LAYOUT_MDSTHRESH); goto out; } lookup_again: lseg = ERR_PTR(nfs4_client_recover_expired_lease(clp)); if (IS_ERR(lseg)) goto out; first = false; spin_lock(&ino->i_lock); lo = pnfs_find_alloc_layout(ino, ctx, gfp_flags); if (lo == NULL) { spin_unlock(&ino->i_lock); trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, PNFS_UPDATE_LAYOUT_NOMEM); goto out; } /* Do we even need to bother with this? */ if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) { trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, PNFS_UPDATE_LAYOUT_BULK_RECALL); dprintk("%s matches recall, use MDS\n", __func__); goto out_unlock; } /* if LAYOUTGET already failed once we don't try again */ if (pnfs_layout_io_test_failed(lo, iomode)) { trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, PNFS_UPDATE_LAYOUT_IO_TEST_FAIL); goto out_unlock; } /* * If the layout segment list is empty, but there are outstanding * layoutget calls, then they might be subject to a layoutrecall. */ if (list_empty(&lo->plh_segs) && atomic_read(&lo->plh_outstanding) != 0) { spin_unlock(&ino->i_lock); lseg = ERR_PTR(wait_var_event_killable(&lo->plh_outstanding, !atomic_read(&lo->plh_outstanding))); if (IS_ERR(lseg)) goto out_put_layout_hdr; pnfs_put_layout_hdr(lo); goto lookup_again; } lseg = pnfs_find_lseg(lo, &arg, strict_iomode); if (lseg) { trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, PNFS_UPDATE_LAYOUT_FOUND_CACHED); goto out_unlock; } /* * Choose a stateid for the LAYOUTGET. If we don't have a layout * stateid, or it has been invalidated, then we must use the open * stateid. */ if (test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags)) { int status; /* * The first layoutget for the file. Need to serialize per * RFC 5661 Errata 3208. */ if (test_and_set_bit(NFS_LAYOUT_FIRST_LAYOUTGET, &lo->plh_flags)) { spin_unlock(&ino->i_lock); lseg = ERR_PTR(wait_on_bit(&lo->plh_flags, NFS_LAYOUT_FIRST_LAYOUTGET, TASK_KILLABLE)); if (IS_ERR(lseg)) goto out_put_layout_hdr; pnfs_put_layout_hdr(lo); dprintk("%s retrying\n", __func__); goto lookup_again; } first = true; status = nfs4_select_rw_stateid(ctx->state, iomode == IOMODE_RW ? FMODE_WRITE : FMODE_READ, NULL, &stateid, NULL); if (status != 0) { lseg = ERR_PTR(status); trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, PNFS_UPDATE_LAYOUT_INVALID_OPEN); spin_unlock(&ino->i_lock); nfs4_schedule_stateid_recovery(server, ctx->state); pnfs_clear_first_layoutget(lo); pnfs_put_layout_hdr(lo); goto lookup_again; } } else { nfs4_stateid_copy(&stateid, &lo->plh_stateid); } /* * Because we free lsegs before sending LAYOUTRETURN, we need to wait * for LAYOUTRETURN even if first is true. */ if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) { spin_unlock(&ino->i_lock); dprintk("%s wait for layoutreturn\n", __func__); lseg = ERR_PTR(pnfs_prepare_to_retry_layoutget(lo)); if (!IS_ERR(lseg)) { if (first) pnfs_clear_first_layoutget(lo); pnfs_put_layout_hdr(lo); dprintk("%s retrying\n", __func__); trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, PNFS_UPDATE_LAYOUT_RETRY); goto lookup_again; } trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, PNFS_UPDATE_LAYOUT_RETURN); goto out_put_layout_hdr; } if (pnfs_layoutgets_blocked(lo)) { trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, PNFS_UPDATE_LAYOUT_BLOCKED); goto out_unlock; } nfs_layoutget_begin(lo); spin_unlock(&ino->i_lock); _add_to_server_list(lo, server); pg_offset = arg.offset & ~PAGE_MASK; if (pg_offset) { arg.offset -= pg_offset; arg.length += pg_offset; } if (arg.length != NFS4_MAX_UINT64) arg.length = PAGE_ALIGN(arg.length); lgp = pnfs_alloc_init_layoutget_args(ino, ctx, &stateid, &arg, gfp_flags); if (!lgp) { trace_pnfs_update_layout(ino, pos, count, iomode, lo, NULL, PNFS_UPDATE_LAYOUT_NOMEM); nfs_layoutget_end(lo); goto out_put_layout_hdr; } lseg = nfs4_proc_layoutget(lgp, &timeout); trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, PNFS_UPDATE_LAYOUT_SEND_LAYOUTGET); nfs_layoutget_end(lo); if (IS_ERR(lseg)) { switch(PTR_ERR(lseg)) { case -EBUSY: if (time_after(jiffies, giveup)) lseg = NULL; break; case -ERECALLCONFLICT: case -EAGAIN: break; default: if (!nfs_error_is_fatal(PTR_ERR(lseg))) { pnfs_layout_clear_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode)); lseg = NULL; } goto out_put_layout_hdr; } if (lseg) { if (first) pnfs_clear_first_layoutget(lo); trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, PNFS_UPDATE_LAYOUT_RETRY); pnfs_put_layout_hdr(lo); goto lookup_again; } } else { pnfs_layout_clear_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode)); } out_put_layout_hdr: if (first) pnfs_clear_first_layoutget(lo); trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, PNFS_UPDATE_LAYOUT_EXIT); pnfs_put_layout_hdr(lo); out: dprintk("%s: inode %s/%llu pNFS layout segment %s for " "(%s, offset: %llu, length: %llu)\n", __func__, ino->i_sb->s_id, (unsigned long long)NFS_FILEID(ino), IS_ERR_OR_NULL(lseg) ? "not found" : "found", iomode==IOMODE_RW ? "read/write" : "read-only", (unsigned long long)pos, (unsigned long long)count); return lseg; out_unlock: spin_unlock(&ino->i_lock); goto out_put_layout_hdr; } EXPORT_SYMBOL_GPL(pnfs_update_layout); static bool pnfs_sanity_check_layout_range(struct pnfs_layout_range *range) { switch (range->iomode) { case IOMODE_READ: case IOMODE_RW: break; default: return false; } if (range->offset == NFS4_MAX_UINT64) return false; if (range->length == 0) return false; if (range->length != NFS4_MAX_UINT64 && range->length > NFS4_MAX_UINT64 - range->offset) return false; return true; } static struct pnfs_layout_hdr * _pnfs_grab_empty_layout(struct inode *ino, struct nfs_open_context *ctx) { struct pnfs_layout_hdr *lo; spin_lock(&ino->i_lock); lo = pnfs_find_alloc_layout(ino, ctx, GFP_KERNEL); if (!lo) goto out_unlock; if (!test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags)) goto out_unlock; if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) goto out_unlock; if (pnfs_layoutgets_blocked(lo)) goto out_unlock; if (test_and_set_bit(NFS_LAYOUT_FIRST_LAYOUTGET, &lo->plh_flags)) goto out_unlock; nfs_layoutget_begin(lo); spin_unlock(&ino->i_lock); _add_to_server_list(lo, NFS_SERVER(ino)); return lo; out_unlock: spin_unlock(&ino->i_lock); pnfs_put_layout_hdr(lo); return NULL; } static void _lgopen_prepare_attached(struct nfs4_opendata *data, struct nfs_open_context *ctx) { struct inode *ino = data->dentry->d_inode; struct pnfs_layout_range rng = { .iomode = (data->o_arg.fmode & FMODE_WRITE) ? IOMODE_RW: IOMODE_READ, .offset = 0, .length = NFS4_MAX_UINT64, }; struct nfs4_layoutget *lgp; struct pnfs_layout_hdr *lo; /* Heuristic: don't send layoutget if we have cached data */ if (rng.iomode == IOMODE_READ && (i_size_read(ino) == 0 || ino->i_mapping->nrpages != 0)) return; lo = _pnfs_grab_empty_layout(ino, ctx); if (!lo) return; lgp = pnfs_alloc_init_layoutget_args(ino, ctx, ¤t_stateid, &rng, GFP_KERNEL); if (!lgp) { pnfs_clear_first_layoutget(lo); pnfs_put_layout_hdr(lo); return; } data->lgp = lgp; data->o_arg.lg_args = &lgp->args; data->o_res.lg_res = &lgp->res; } static void _lgopen_prepare_floating(struct nfs4_opendata *data, struct nfs_open_context *ctx) { struct pnfs_layout_range rng = { .iomode = (data->o_arg.fmode & FMODE_WRITE) ? IOMODE_RW: IOMODE_READ, .offset = 0, .length = NFS4_MAX_UINT64, }; struct nfs4_layoutget *lgp; lgp = pnfs_alloc_init_layoutget_args(NULL, ctx, ¤t_stateid, &rng, GFP_KERNEL); if (!lgp) return; data->lgp = lgp; data->o_arg.lg_args = &lgp->args; data->o_res.lg_res = &lgp->res; } void pnfs_lgopen_prepare(struct nfs4_opendata *data, struct nfs_open_context *ctx) { struct nfs_server *server = NFS_SERVER(data->dir->d_inode); if (!(pnfs_enabled_sb(server) && server->pnfs_curr_ld->flags & PNFS_LAYOUTGET_ON_OPEN)) return; /* Could check on max_ops, but currently hardcoded high enough */ if (!nfs_server_capable(data->dir->d_inode, NFS_CAP_LGOPEN)) return; if (data->state) _lgopen_prepare_attached(data, ctx); else _lgopen_prepare_floating(data, ctx); } void pnfs_parse_lgopen(struct inode *ino, struct nfs4_layoutget *lgp, struct nfs_open_context *ctx) { struct pnfs_layout_hdr *lo; struct pnfs_layout_segment *lseg; struct nfs_server *srv = NFS_SERVER(ino); u32 iomode; if (!lgp) return; dprintk("%s: entered with status %i\n", __func__, lgp->res.status); if (lgp->res.status) { switch (lgp->res.status) { default: break; /* * Halt lgopen attempts if the server doesn't recognise * the "current stateid" value, the layout type, or the * layoutget operation as being valid. * Also if it complains about too many ops in the compound * or of the request/reply being too big. */ case -NFS4ERR_BAD_STATEID: case -NFS4ERR_NOTSUPP: case -NFS4ERR_REP_TOO_BIG: case -NFS4ERR_REP_TOO_BIG_TO_CACHE: case -NFS4ERR_REQ_TOO_BIG: case -NFS4ERR_TOO_MANY_OPS: case -NFS4ERR_UNKNOWN_LAYOUTTYPE: srv->caps &= ~NFS_CAP_LGOPEN; } return; } if (!lgp->args.inode) { lo = _pnfs_grab_empty_layout(ino, ctx); if (!lo) return; lgp->args.inode = ino; } else lo = NFS_I(lgp->args.inode)->layout; lseg = pnfs_layout_process(lgp); if (!IS_ERR(lseg)) { iomode = lgp->args.range.iomode; pnfs_layout_clear_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode)); pnfs_put_lseg(lseg); } } void nfs4_lgopen_release(struct nfs4_layoutget *lgp) { if (lgp != NULL) { struct inode *inode = lgp->args.inode; if (inode) { struct pnfs_layout_hdr *lo = NFS_I(inode)->layout; pnfs_clear_first_layoutget(lo); nfs_layoutget_end(lo); } pnfs_layoutget_free(lgp); } } struct pnfs_layout_segment * pnfs_layout_process(struct nfs4_layoutget *lgp) { struct pnfs_layout_hdr *lo = NFS_I(lgp->args.inode)->layout; struct nfs4_layoutget_res *res = &lgp->res; struct pnfs_layout_segment *lseg; struct inode *ino = lo->plh_inode; LIST_HEAD(free_me); if (!pnfs_sanity_check_layout_range(&res->range)) return ERR_PTR(-EINVAL); /* Inject layout blob into I/O device driver */ lseg = NFS_SERVER(ino)->pnfs_curr_ld->alloc_lseg(lo, res, lgp->gfp_flags); if (IS_ERR_OR_NULL(lseg)) { if (!lseg) lseg = ERR_PTR(-ENOMEM); dprintk("%s: Could not allocate layout: error %ld\n", __func__, PTR_ERR(lseg)); return lseg; } pnfs_init_lseg(lo, lseg, &res->range, &res->stateid); spin_lock(&ino->i_lock); if (pnfs_layoutgets_blocked(lo)) { dprintk("%s forget reply due to state\n", __func__); goto out_forget; } if (!pnfs_layout_is_valid(lo)) { /* We have a completely new layout */ pnfs_set_layout_stateid(lo, &res->stateid, lgp->cred, true); } else if (nfs4_stateid_match_other(&lo->plh_stateid, &res->stateid)) { /* existing state ID, make sure the sequence number matches. */ if (pnfs_layout_stateid_blocked(lo, &res->stateid)) { dprintk("%s forget reply due to sequence\n", __func__); goto out_forget; } pnfs_set_layout_stateid(lo, &res->stateid, lgp->cred, false); } else { /* * We got an entirely new state ID. Mark all segments for the * inode invalid, and retry the layoutget */ pnfs_mark_layout_stateid_invalid(lo, &free_me); goto out_forget; } pnfs_get_lseg(lseg); pnfs_layout_insert_lseg(lo, lseg, &free_me); if (res->return_on_close) set_bit(NFS_LSEG_ROC, &lseg->pls_flags); spin_unlock(&ino->i_lock); pnfs_free_lseg_list(&free_me); return lseg; out_forget: spin_unlock(&ino->i_lock); lseg->pls_layout = lo; NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg); return ERR_PTR(-EAGAIN); } static int mark_lseg_invalid_or_return(struct pnfs_layout_segment *lseg, struct list_head *tmp_list) { if (!mark_lseg_invalid(lseg, tmp_list)) return 0; pnfs_cache_lseg_for_layoutreturn(lseg->pls_layout, lseg); return 1; } /** * pnfs_mark_matching_lsegs_return - Free or return matching layout segments * @lo: pointer to layout header * @tmp_list: list header to be used with pnfs_free_lseg_list() * @return_range: describe layout segment ranges to be returned * @seq: stateid seqid to match * * This function is mainly intended for use by layoutrecall. It attempts * to free the layout segment immediately, or else to mark it for return * as soon as its reference count drops to zero. * * Returns * - 0: a layoutreturn needs to be scheduled. * - EBUSY: there are layout segment that are still in use. * - ENOENT: there are no layout segments that need to be returned. */ int pnfs_mark_matching_lsegs_return(struct pnfs_layout_hdr *lo, struct list_head *tmp_list, const struct pnfs_layout_range *return_range, u32 seq) { struct pnfs_layout_segment *lseg, *next; int remaining = 0; dprintk("%s:Begin lo %p\n", __func__, lo); assert_spin_locked(&lo->plh_inode->i_lock); list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list) if (pnfs_match_lseg_recall(lseg, return_range, seq)) { dprintk("%s: marking lseg %p iomode %d " "offset %llu length %llu\n", __func__, lseg, lseg->pls_range.iomode, lseg->pls_range.offset, lseg->pls_range.length); if (mark_lseg_invalid_or_return(lseg, tmp_list)) continue; remaining++; set_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags); } if (remaining) { pnfs_set_plh_return_info(lo, return_range->iomode, seq); return -EBUSY; } if (!list_empty(&lo->plh_return_segs)) { pnfs_set_plh_return_info(lo, return_range->iomode, seq); return 0; } return -ENOENT; } void pnfs_error_mark_layout_for_return(struct inode *inode, struct pnfs_layout_segment *lseg) { struct pnfs_layout_hdr *lo = NFS_I(inode)->layout; struct pnfs_layout_range range = { .iomode = lseg->pls_range.iomode, .offset = 0, .length = NFS4_MAX_UINT64, }; bool return_now = false; spin_lock(&inode->i_lock); if (!pnfs_layout_is_valid(lo)) { spin_unlock(&inode->i_lock); return; } pnfs_set_plh_return_info(lo, range.iomode, 0); /* * mark all matching lsegs so that we are sure to have no live * segments at hand when sending layoutreturn. See pnfs_put_lseg() * for how it works. */ if (pnfs_mark_matching_lsegs_return(lo, &lo->plh_return_segs, &range, 0) != -EBUSY) { nfs4_stateid stateid; enum pnfs_iomode iomode; return_now = pnfs_prepare_layoutreturn(lo, &stateid, &iomode); spin_unlock(&inode->i_lock); if (return_now) pnfs_send_layoutreturn(lo, &stateid, iomode, false); } else { spin_unlock(&inode->i_lock); nfs_commit_inode(inode, 0); } } EXPORT_SYMBOL_GPL(pnfs_error_mark_layout_for_return); void pnfs_generic_pg_check_layout(struct nfs_pageio_descriptor *pgio) { if (pgio->pg_lseg == NULL || test_bit(NFS_LSEG_VALID, &pgio->pg_lseg->pls_flags)) return; pnfs_put_lseg(pgio->pg_lseg); pgio->pg_lseg = NULL; } EXPORT_SYMBOL_GPL(pnfs_generic_pg_check_layout); /* * Check for any intersection between the request and the pgio->pg_lseg, * and if none, put this pgio->pg_lseg away. */ static void pnfs_generic_pg_check_range(struct nfs_pageio_descriptor *pgio, struct nfs_page *req) { if (pgio->pg_lseg && !pnfs_lseg_request_intersecting(pgio->pg_lseg, req)) { pnfs_put_lseg(pgio->pg_lseg); pgio->pg_lseg = NULL; } } void pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *req) { u64 rd_size = req->wb_bytes; pnfs_generic_pg_check_layout(pgio); pnfs_generic_pg_check_range(pgio, req); if (pgio->pg_lseg == NULL) { if (pgio->pg_dreq == NULL) rd_size = i_size_read(pgio->pg_inode) - req_offset(req); else rd_size = nfs_dreq_bytes_left(pgio->pg_dreq); pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode, nfs_req_openctx(req), req_offset(req), rd_size, 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); } EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_read); void pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio, struct nfs_page *req, u64 wb_size) { pnfs_generic_pg_check_layout(pgio); pnfs_generic_pg_check_range(pgio, req); if (pgio->pg_lseg == NULL) { pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode, nfs_req_openctx(req), req_offset(req), wb_size, IOMODE_RW, 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 write through mds */ if (pgio->pg_lseg == NULL) nfs_pageio_reset_write_mds(pgio); } EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_write); void pnfs_generic_pg_cleanup(struct nfs_pageio_descriptor *desc) { if (desc->pg_lseg) { pnfs_put_lseg(desc->pg_lseg); desc->pg_lseg = NULL; } } EXPORT_SYMBOL_GPL(pnfs_generic_pg_cleanup); /* * Return 0 if @req cannot be coalesced into @pgio, otherwise return the number * of bytes (maximum @req->wb_bytes) that can be coalesced. */ size_t pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev, struct nfs_page *req) { unsigned int size; u64 seg_end, req_start, seg_left; size = nfs_generic_pg_test(pgio, prev, req); if (!size) return 0; /* * 'size' contains the number of bytes left in the current page (up * to the original size asked for in @req->wb_bytes). * * Calculate how many bytes are left in the layout segment * and if there are less bytes than 'size', return that instead. * * Please also note that 'end_offset' is actually the offset of the * first byte that lies outside the pnfs_layout_range. FIXME? * */ if (pgio->pg_lseg) { seg_end = pnfs_end_offset(pgio->pg_lseg->pls_range.offset, pgio->pg_lseg->pls_range.length); req_start = req_offset(req); /* start of request is past the last byte of this segment */ if (req_start >= seg_end) return 0; /* adjust 'size' iff there are fewer bytes left in the * segment than what nfs_generic_pg_test returned */ seg_left = seg_end - req_start; if (seg_left < size) size = (unsigned int)seg_left; } return size; } EXPORT_SYMBOL_GPL(pnfs_generic_pg_test); int pnfs_write_done_resend_to_mds(struct nfs_pgio_header *hdr) { struct nfs_pageio_descriptor pgio; /* Resend all requests through the MDS */ nfs_pageio_init_write(&pgio, hdr->inode, FLUSH_STABLE, true, hdr->completion_ops); set_bit(NFS_CONTEXT_RESEND_WRITES, &hdr->args.context->flags); return nfs_pageio_resend(&pgio, hdr); } EXPORT_SYMBOL_GPL(pnfs_write_done_resend_to_mds); static void pnfs_ld_handle_write_error(struct nfs_pgio_header *hdr) { dprintk("pnfs write error = %d\n", hdr->pnfs_error); if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags & PNFS_LAYOUTRET_ON_ERROR) { pnfs_return_layout(hdr->inode); } if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) hdr->task.tk_status = pnfs_write_done_resend_to_mds(hdr); } /* * Called by non rpc-based layout drivers */ void pnfs_ld_write_done(struct nfs_pgio_header *hdr) { if (likely(!hdr->pnfs_error)) { pnfs_set_layoutcommit(hdr->inode, hdr->lseg, hdr->mds_offset + hdr->res.count); hdr->mds_ops->rpc_call_done(&hdr->task, hdr); } trace_nfs4_pnfs_write(hdr, hdr->pnfs_error); if (unlikely(hdr->pnfs_error)) pnfs_ld_handle_write_error(hdr); hdr->mds_ops->rpc_release(hdr); } EXPORT_SYMBOL_GPL(pnfs_ld_write_done); static void pnfs_write_through_mds(struct nfs_pageio_descriptor *desc, struct nfs_pgio_header *hdr) { struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc); if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { list_splice_tail_init(&hdr->pages, &mirror->pg_list); nfs_pageio_reset_write_mds(desc); mirror->pg_recoalesce = 1; } hdr->completion_ops->completion(hdr); } static enum pnfs_try_status pnfs_try_to_write_data(struct nfs_pgio_header *hdr, const struct rpc_call_ops *call_ops, struct pnfs_layout_segment *lseg, int how) { struct inode *inode = hdr->inode; enum pnfs_try_status trypnfs; struct nfs_server *nfss = NFS_SERVER(inode); hdr->mds_ops = call_ops; dprintk("%s: Writing ino:%lu %u@%llu (how %d)\n", __func__, inode->i_ino, hdr->args.count, hdr->args.offset, how); trypnfs = nfss->pnfs_curr_ld->write_pagelist(hdr, how); if (trypnfs != PNFS_NOT_ATTEMPTED) nfs_inc_stats(inode, NFSIOS_PNFS_WRITE); dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs); return trypnfs; } static void pnfs_do_write(struct nfs_pageio_descriptor *desc, struct nfs_pgio_header *hdr, int how) { const struct rpc_call_ops *call_ops = desc->pg_rpc_callops; struct pnfs_layout_segment *lseg = desc->pg_lseg; enum pnfs_try_status trypnfs; trypnfs = pnfs_try_to_write_data(hdr, call_ops, lseg, how); switch (trypnfs) { case PNFS_NOT_ATTEMPTED: pnfs_write_through_mds(desc, hdr); case PNFS_ATTEMPTED: break; case PNFS_TRY_AGAIN: /* cleanup hdr and prepare to redo pnfs */ if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc); list_splice_init(&hdr->pages, &mirror->pg_list); mirror->pg_recoalesce = 1; } hdr->mds_ops->rpc_release(hdr); } } static void pnfs_writehdr_free(struct nfs_pgio_header *hdr) { pnfs_put_lseg(hdr->lseg); nfs_pgio_header_free(hdr); } int pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc) { struct nfs_pgio_header *hdr; int ret; hdr = nfs_pgio_header_alloc(desc->pg_rw_ops); if (!hdr) { desc->pg_error = -ENOMEM; return desc->pg_error; } nfs_pgheader_init(desc, hdr, pnfs_writehdr_free); hdr->lseg = pnfs_get_lseg(desc->pg_lseg); ret = nfs_generic_pgio(desc, hdr); if (!ret) pnfs_do_write(desc, hdr, desc->pg_ioflags); return ret; } EXPORT_SYMBOL_GPL(pnfs_generic_pg_writepages); int pnfs_read_done_resend_to_mds(struct nfs_pgio_header *hdr) { struct nfs_pageio_descriptor pgio; /* Resend all requests through the MDS */ nfs_pageio_init_read(&pgio, hdr->inode, true, hdr->completion_ops); return nfs_pageio_resend(&pgio, hdr); } EXPORT_SYMBOL_GPL(pnfs_read_done_resend_to_mds); static void pnfs_ld_handle_read_error(struct nfs_pgio_header *hdr) { dprintk("pnfs read error = %d\n", hdr->pnfs_error); if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags & PNFS_LAYOUTRET_ON_ERROR) { pnfs_return_layout(hdr->inode); } if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) hdr->task.tk_status = pnfs_read_done_resend_to_mds(hdr); } /* * Called by non rpc-based layout drivers */ void pnfs_ld_read_done(struct nfs_pgio_header *hdr) { if (likely(!hdr->pnfs_error)) hdr->mds_ops->rpc_call_done(&hdr->task, hdr); trace_nfs4_pnfs_read(hdr, hdr->pnfs_error); if (unlikely(hdr->pnfs_error)) pnfs_ld_handle_read_error(hdr); hdr->mds_ops->rpc_release(hdr); } EXPORT_SYMBOL_GPL(pnfs_ld_read_done); static void pnfs_read_through_mds(struct nfs_pageio_descriptor *desc, struct nfs_pgio_header *hdr) { struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc); if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { list_splice_tail_init(&hdr->pages, &mirror->pg_list); nfs_pageio_reset_read_mds(desc); mirror->pg_recoalesce = 1; } hdr->completion_ops->completion(hdr); } /* * Call the appropriate parallel I/O subsystem read function. */ static enum pnfs_try_status pnfs_try_to_read_data(struct nfs_pgio_header *hdr, const struct rpc_call_ops *call_ops, struct pnfs_layout_segment *lseg) { struct inode *inode = hdr->inode; struct nfs_server *nfss = NFS_SERVER(inode); enum pnfs_try_status trypnfs; hdr->mds_ops = call_ops; dprintk("%s: Reading ino:%lu %u@%llu\n", __func__, inode->i_ino, hdr->args.count, hdr->args.offset); trypnfs = nfss->pnfs_curr_ld->read_pagelist(hdr); if (trypnfs != PNFS_NOT_ATTEMPTED) nfs_inc_stats(inode, NFSIOS_PNFS_READ); dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs); return trypnfs; } /* Resend all requests through pnfs. */ void pnfs_read_resend_pnfs(struct nfs_pgio_header *hdr) { struct nfs_pageio_descriptor pgio; if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { /* Prevent deadlocks with layoutreturn! */ pnfs_put_lseg(hdr->lseg); hdr->lseg = NULL; nfs_pageio_init_read(&pgio, hdr->inode, false, hdr->completion_ops); hdr->task.tk_status = nfs_pageio_resend(&pgio, hdr); } } EXPORT_SYMBOL_GPL(pnfs_read_resend_pnfs); static void pnfs_do_read(struct nfs_pageio_descriptor *desc, struct nfs_pgio_header *hdr) { const struct rpc_call_ops *call_ops = desc->pg_rpc_callops; struct pnfs_layout_segment *lseg = desc->pg_lseg; enum pnfs_try_status trypnfs; trypnfs = pnfs_try_to_read_data(hdr, call_ops, lseg); switch (trypnfs) { case PNFS_NOT_ATTEMPTED: pnfs_read_through_mds(desc, hdr); case PNFS_ATTEMPTED: break; case PNFS_TRY_AGAIN: /* cleanup hdr and prepare to redo pnfs */ if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc); list_splice_init(&hdr->pages, &mirror->pg_list); mirror->pg_recoalesce = 1; } hdr->mds_ops->rpc_release(hdr); } } static void pnfs_readhdr_free(struct nfs_pgio_header *hdr) { pnfs_put_lseg(hdr->lseg); nfs_pgio_header_free(hdr); } int pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc) { struct nfs_pgio_header *hdr; int ret; hdr = nfs_pgio_header_alloc(desc->pg_rw_ops); if (!hdr) { desc->pg_error = -ENOMEM; return desc->pg_error; } nfs_pgheader_init(desc, hdr, pnfs_readhdr_free); hdr->lseg = pnfs_get_lseg(desc->pg_lseg); ret = nfs_generic_pgio(desc, hdr); if (!ret) pnfs_do_read(desc, hdr); return ret; } EXPORT_SYMBOL_GPL(pnfs_generic_pg_readpages); static void pnfs_clear_layoutcommitting(struct inode *inode) { unsigned long *bitlock = &NFS_I(inode)->flags; clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock); smp_mb__after_atomic(); wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING); } /* * There can be multiple RW segments. */ static void pnfs_list_write_lseg(struct inode *inode, struct list_head *listp) { struct pnfs_layout_segment *lseg; list_for_each_entry(lseg, &NFS_I(inode)->layout->plh_segs, pls_list) { if (lseg->pls_range.iomode == IOMODE_RW && test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags)) list_add(&lseg->pls_lc_list, listp); } } static void pnfs_list_write_lseg_done(struct inode *inode, struct list_head *listp) { struct pnfs_layout_segment *lseg, *tmp; /* Matched by references in pnfs_set_layoutcommit */ list_for_each_entry_safe(lseg, tmp, listp, pls_lc_list) { list_del_init(&lseg->pls_lc_list); pnfs_put_lseg(lseg); } pnfs_clear_layoutcommitting(inode); } void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg) { pnfs_layout_io_set_failed(lseg->pls_layout, lseg->pls_range.iomode); } EXPORT_SYMBOL_GPL(pnfs_set_lo_fail); void pnfs_set_layoutcommit(struct inode *inode, struct pnfs_layout_segment *lseg, loff_t end_pos) { struct nfs_inode *nfsi = NFS_I(inode); bool mark_as_dirty = false; spin_lock(&inode->i_lock); if (!test_and_set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) { nfsi->layout->plh_lwb = end_pos; mark_as_dirty = true; dprintk("%s: Set layoutcommit for inode %lu ", __func__, inode->i_ino); } else if (end_pos > nfsi->layout->plh_lwb) nfsi->layout->plh_lwb = end_pos; if (!test_and_set_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags)) { /* references matched in nfs4_layoutcommit_release */ pnfs_get_lseg(lseg); } spin_unlock(&inode->i_lock); dprintk("%s: lseg %p end_pos %llu\n", __func__, lseg, nfsi->layout->plh_lwb); /* if pnfs_layoutcommit_inode() runs between inode locks, the next one * will be a noop because NFS_INO_LAYOUTCOMMIT will not be set */ if (mark_as_dirty) mark_inode_dirty_sync(inode); } EXPORT_SYMBOL_GPL(pnfs_set_layoutcommit); void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data) { struct nfs_server *nfss = NFS_SERVER(data->args.inode); if (nfss->pnfs_curr_ld->cleanup_layoutcommit) nfss->pnfs_curr_ld->cleanup_layoutcommit(data); pnfs_list_write_lseg_done(data->args.inode, &data->lseg_list); } /* * For the LAYOUT4_NFSV4_1_FILES layout type, NFS_DATA_SYNC WRITEs and * NFS_UNSTABLE WRITEs with a COMMIT to data servers must store enough * data to disk to allow the server to recover the data if it crashes. * LAYOUTCOMMIT is only needed when the NFL4_UFLG_COMMIT_THRU_MDS flag * is off, and a COMMIT is sent to a data server, or * if WRITEs to a data server return NFS_DATA_SYNC. */ int pnfs_layoutcommit_inode(struct inode *inode, bool sync) { struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld; struct nfs4_layoutcommit_data *data; struct nfs_inode *nfsi = NFS_I(inode); loff_t end_pos; int status; if (!pnfs_layoutcommit_outstanding(inode)) return 0; dprintk("--> %s inode %lu\n", __func__, inode->i_ino); status = -EAGAIN; if (test_and_set_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags)) { if (!sync) goto out; status = wait_on_bit_lock_action(&nfsi->flags, NFS_INO_LAYOUTCOMMITTING, nfs_wait_bit_killable, TASK_KILLABLE); if (status) goto out; } status = -ENOMEM; /* Note kzalloc ensures data->res.seq_res.sr_slot == NULL */ data = kzalloc(sizeof(*data), GFP_NOFS); if (!data) goto clear_layoutcommitting; status = 0; spin_lock(&inode->i_lock); if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) goto out_unlock; INIT_LIST_HEAD(&data->lseg_list); pnfs_list_write_lseg(inode, &data->lseg_list); end_pos = nfsi->layout->plh_lwb; nfs4_stateid_copy(&data->args.stateid, &nfsi->layout->plh_stateid); spin_unlock(&inode->i_lock); data->args.inode = inode; data->cred = get_cred(nfsi->layout->plh_lc_cred); nfs_fattr_init(&data->fattr); data->args.bitmask = NFS_SERVER(inode)->cache_consistency_bitmask; data->res.fattr = &data->fattr; if (end_pos != 0) data->args.lastbytewritten = end_pos - 1; else data->args.lastbytewritten = U64_MAX; data->res.server = NFS_SERVER(inode); if (ld->prepare_layoutcommit) { status = ld->prepare_layoutcommit(&data->args); if (status) { put_cred(data->cred); spin_lock(&inode->i_lock); set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags); if (end_pos > nfsi->layout->plh_lwb) nfsi->layout->plh_lwb = end_pos; goto out_unlock; } } status = nfs4_proc_layoutcommit(data, sync); out: if (status) mark_inode_dirty_sync(inode); dprintk("<-- %s status %d\n", __func__, status); return status; out_unlock: spin_unlock(&inode->i_lock); kfree(data); clear_layoutcommitting: pnfs_clear_layoutcommitting(inode); goto out; } EXPORT_SYMBOL_GPL(pnfs_layoutcommit_inode); int pnfs_generic_sync(struct inode *inode, bool datasync) { return pnfs_layoutcommit_inode(inode, true); } EXPORT_SYMBOL_GPL(pnfs_generic_sync); struct nfs4_threshold *pnfs_mdsthreshold_alloc(void) { struct nfs4_threshold *thp; thp = kzalloc(sizeof(*thp), GFP_NOFS); if (!thp) { dprintk("%s mdsthreshold allocation failed\n", __func__); return NULL; } return thp; } #if IS_ENABLED(CONFIG_NFS_V4_2) int pnfs_report_layoutstat(struct inode *inode, gfp_t gfp_flags) { struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld; struct nfs_server *server = NFS_SERVER(inode); struct nfs_inode *nfsi = NFS_I(inode); struct nfs42_layoutstat_data *data; struct pnfs_layout_hdr *hdr; int status = 0; if (!pnfs_enabled_sb(server) || !ld->prepare_layoutstats) goto out; if (!nfs_server_capable(inode, NFS_CAP_LAYOUTSTATS)) goto out; if (test_and_set_bit(NFS_INO_LAYOUTSTATS, &nfsi->flags)) goto out; spin_lock(&inode->i_lock); if (!NFS_I(inode)->layout) { spin_unlock(&inode->i_lock); goto out_clear_layoutstats; } hdr = NFS_I(inode)->layout; pnfs_get_layout_hdr(hdr); spin_unlock(&inode->i_lock); data = kzalloc(sizeof(*data), gfp_flags); if (!data) { status = -ENOMEM; goto out_put; } data->args.fh = NFS_FH(inode); data->args.inode = inode; status = ld->prepare_layoutstats(&data->args); if (status) goto out_free; status = nfs42_proc_layoutstats_generic(NFS_SERVER(inode), data); out: dprintk("%s returns %d\n", __func__, status); return status; out_free: kfree(data); out_put: pnfs_put_layout_hdr(hdr); out_clear_layoutstats: smp_mb__before_atomic(); clear_bit(NFS_INO_LAYOUTSTATS, &nfsi->flags); smp_mb__after_atomic(); goto out; } EXPORT_SYMBOL_GPL(pnfs_report_layoutstat); #endif unsigned int layoutstats_timer; module_param(layoutstats_timer, uint, 0644); EXPORT_SYMBOL_GPL(layoutstats_timer);