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- /*
- * 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 <[email protected]>
- *
- * 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/sort.h>
- #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;
- }
- const struct pnfs_layoutdriver_type *pnfs_find_layoutdriver(u32 id)
- {
- return find_pnfs_driver(id);
- }
- void pnfs_put_layoutdriver(const struct pnfs_layoutdriver_type *ld)
- {
- if (ld)
- module_put(ld->owner);
- }
- 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 (test_and_clear_bit(NFS_LAYOUT_HASHED, &lo->plh_flags)) {
- struct nfs_client *clp = server->nfs_client;
- spin_lock(&clp->cl_lock);
- list_del_rcu(&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;
- unsigned long i_state;
- 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);
- i_state = inode->i_state;
- spin_unlock(&inode->i_lock);
- pnfs_free_layout_hdr(lo);
- /* Notify pnfs_destroy_layout_final() that we're done */
- if (i_state & (I_FREEING | I_CLEAR))
- wake_up_var(lo);
- }
- }
- static struct inode *
- pnfs_grab_inode_layout_hdr(struct pnfs_layout_hdr *lo)
- {
- struct inode *inode = igrab(lo->plh_inode);
- if (inode)
- return inode;
- set_bit(NFS_LAYOUT_INODE_FREEING, &lo->plh_flags);
- return NULL;
- }
- /*
- * 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 void pnfs_barrier_update(struct pnfs_layout_hdr *lo, u32 newseq)
- {
- if (pnfs_seqid_is_newer(newseq, lo->plh_barrier) || !lo->plh_barrier)
- lo->plh_barrier = newseq;
- }
- 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);
- /*
- * We must set lo->plh_return_seq to avoid livelocks with
- * pnfs_layout_need_return()
- */
- if (seq == 0)
- seq = be32_to_cpu(lo->plh_stateid.seqid);
- if (!lo->plh_return_seq || pnfs_seqid_is_newer(seq, lo->plh_return_seq))
- lo->plh_return_seq = seq;
- pnfs_barrier_update(lo, 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);
- set_bit(NFS_LAYOUT_DRAIN, &lo->plh_flags);
- 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);
- INIT_LIST_HEAD(&lseg->pls_commits);
- 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)) {
- 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;
- }
- 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;
- struct nfs_server *server = NFS_SERVER(lo->plh_inode);
- 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))
- continue;
- remaining++;
- pnfs_lseg_cancel_io(server, lseg);
- }
- 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);
- }
- }
- static struct pnfs_layout_hdr *__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);
- return lo;
- }
- void pnfs_destroy_layout(struct nfs_inode *nfsi)
- {
- __pnfs_destroy_layout(nfsi);
- }
- EXPORT_SYMBOL_GPL(pnfs_destroy_layout);
- static bool pnfs_layout_removed(struct nfs_inode *nfsi,
- struct pnfs_layout_hdr *lo)
- {
- bool ret;
- spin_lock(&nfsi->vfs_inode.i_lock);
- ret = nfsi->layout != lo;
- spin_unlock(&nfsi->vfs_inode.i_lock);
- return ret;
- }
- void pnfs_destroy_layout_final(struct nfs_inode *nfsi)
- {
- struct pnfs_layout_hdr *lo = __pnfs_destroy_layout(nfsi);
- if (lo)
- wait_var_event(lo, pnfs_layout_removed(nfsi, lo));
- }
- 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 = pnfs_grab_inode_layout_hdr(lo);
- if (inode != NULL) {
- if (test_and_clear_bit(NFS_LAYOUT_HASHED, &lo->plh_flags))
- list_del_rcu(&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);
- }
- 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 manager 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 = be32_to_cpu(lo->plh_stateid.seqid);
- u32 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);
- if (update_barrier) {
- pnfs_barrier_update(lo, newseq);
- return;
- }
- /*
- * Because of wraparound, we want to keep the barrier
- * "close" to the current seqids. We really only want to
- * get here from a layoutget call.
- */
- if (atomic_read(&lo->plh_outstanding) == 1)
- pnfs_barrier_update(lo, be32_to_cpu(lo->plh_stateid.seqid));
- }
- static bool
- pnfs_layout_stateid_blocked(const struct pnfs_layout_hdr *lo,
- const nfs4_stateid *stateid)
- {
- u32 seqid = be32_to_cpu(stateid->seqid);
- return lo->plh_barrier && pnfs_seqid_is_newer(lo->plh_barrier, seqid);
- }
- /* 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 = 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);
- pnfs_put_layout_hdr(lgp->lo);
- 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) ||
- !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,
- const struct cred **cred,
- 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);
- nfs4_stateid_copy(stateid, &lo->plh_stateid);
- *cred = get_cred(lo->plh_lc_cred);
- if (test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags)) {
- 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);
- } else if (iomode != NULL)
- *iomode = IOMODE_ANY;
- pnfs_barrier_update(lo, be32_to_cpu(stateid->seqid));
- 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,
- const struct cred **pcred,
- 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;
- const struct cred *cred = *pcred;
- int status = 0;
- *pcred = NULL;
- lrp = kzalloc(sizeof(*lrp), nfs_io_gfp_mask());
- if (unlikely(lrp == NULL)) {
- status = -ENOMEM;
- spin_lock(&ino->i_lock);
- pnfs_clear_layoutreturn_waitbit(lo);
- spin_unlock(&ino->i_lock);
- put_cred(cred);
- 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 = 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;
- }
- static bool
- pnfs_layout_segments_returnable(struct pnfs_layout_hdr *lo,
- enum pnfs_iomode iomode,
- u32 seq)
- {
- struct pnfs_layout_range recall_range = {
- .length = NFS4_MAX_UINT64,
- .iomode = iomode,
- };
- return pnfs_mark_matching_lsegs_return(lo, &lo->plh_return_segs,
- &recall_range, seq) != -EBUSY;
- }
- /* Return true if layoutreturn is needed */
- static bool
- pnfs_layout_need_return(struct pnfs_layout_hdr *lo)
- {
- if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags))
- return false;
- return pnfs_layout_segments_returnable(lo, lo->plh_return_iomode,
- lo->plh_return_seq);
- }
- 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)) {
- const struct cred *cred;
- nfs4_stateid stateid;
- enum pnfs_iomode iomode;
- bool send;
- send = pnfs_prepare_layoutreturn(lo, &stateid, &cred, &iomode);
- spin_unlock(&inode->i_lock);
- if (send) {
- /* Send an async layoutreturn so we dont deadlock */
- pnfs_send_layoutreturn(lo, &stateid, &cred, 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);
- struct pnfs_layout_range range = {
- .iomode = IOMODE_ANY,
- .offset = 0,
- .length = NFS4_MAX_UINT64,
- };
- LIST_HEAD(tmp_list);
- const struct cred *cred;
- 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_return(lo, &tmp_list, &range, 0);
- if (NFS_SERVER(ino)->pnfs_curr_ld->return_range)
- 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_wait_layoutreturn;
- }
- send = pnfs_prepare_layoutreturn(lo, &stateid, &cred, NULL);
- spin_unlock(&ino->i_lock);
- if (send)
- status = pnfs_send_layoutreturn(lo, &stateid, &cred, IOMODE_ANY, true);
- out_wait_layoutreturn:
- wait_on_bit(&lo->plh_flags, NFS_LAYOUT_RETURN, TASK_UNINTERRUPTIBLE);
- 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;
- const struct cred *lc_cred;
- 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, &lc_cred, &iomode);
- /* If the creds don't match, we can't compound the layoutreturn */
- if (!layoutreturn || cred_fscmp(cred, lc_cred) != 0)
- goto out_noroc;
- roc = layoutreturn;
- pnfs_init_layoutreturn_args(args, lo, &stateid, iomode);
- res->lrs_present = 0;
- layoutreturn = false;
- put_cred(lc_cred);
- 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, &lc_cred, iomode, true);
- pnfs_put_layout_hdr(lo);
- return false;
- }
- int pnfs_roc_done(struct rpc_task *task, 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, arg->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;
- struct inode *inode = args->inode;
- const nfs4_stateid *res_stateid = NULL;
- struct nfs4_xdr_opaque_data *ld_private = args->ld_private;
- switch (ret) {
- case -NFS4ERR_NOMATCHING_LAYOUT:
- spin_lock(&inode->i_lock);
- if (pnfs_layout_is_valid(lo) &&
- nfs4_stateid_match_other(&args->stateid, &lo->plh_stateid))
- pnfs_set_plh_return_info(lo, args->range.iomode, 0);
- pnfs_clear_layoutreturn_waitbit(lo);
- spin_unlock(&inode->i_lock);
- break;
- case 0:
- if (res->lrs_present)
- res_stateid = &res->stateid;
- fallthrough;
- default:
- pnfs_layoutreturn_free_lsegs(lo, &args->stateid, &args->range,
- res_stateid);
- }
- trace_nfs4_layoutreturn_on_close(args->inode, &args->stateid, ret);
- if (ld_private && ld_private->ops && ld_private->ops->free)
- ld_private->ops->free(ld_private);
- pnfs_put_layout_hdr(lo);
- }
- 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|TASK_FREEZABLE_UNSAFE);
- }
- 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) &&
- test_and_clear_bit(NFS_LAYOUT_DRAIN, &lo->plh_flags))
- wake_up_bit(&lo->plh_flags, NFS_LAYOUT_DRAIN);
- }
- static bool pnfs_is_first_layoutget(struct pnfs_layout_hdr *lo)
- {
- return test_bit(NFS_LAYOUT_FIRST_LAYOUTGET, &lo->plh_flags);
- }
- 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 (!test_and_set_bit(NFS_LAYOUT_HASHED, &lo->plh_flags)) {
- 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);
- list_add_tail_rcu(&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);
- lseg = ERR_PTR(-ENOMEM);
- 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 (test_bit(NFS_LAYOUT_DRAIN, &lo->plh_flags) &&
- atomic_read(&lo->plh_outstanding) != 0) {
- spin_unlock(&ino->i_lock);
- lseg = ERR_PTR(wait_on_bit(&lo->plh_flags, NFS_LAYOUT_DRAIN,
- TASK_KILLABLE));
- if (IS_ERR(lseg))
- goto out_put_layout_hdr;
- pnfs_put_layout_hdr(lo);
- goto lookup_again;
- }
- /*
- * Because we free lsegs when sending LAYOUTRETURN, we need to wait
- * for LAYOUTRETURN.
- */
- 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)) {
- 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;
- }
- 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;
- }
- spin_unlock(&ino->i_lock);
- 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);
- nfs4_schedule_stateid_recovery(server, ctx->state);
- pnfs_clear_first_layoutget(lo);
- pnfs_put_layout_hdr(lo);
- goto lookup_again;
- }
- spin_lock(&ino->i_lock);
- } else {
- nfs4_stateid_copy(&stateid, &lo->plh_stateid);
- }
- 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) {
- lseg = ERR_PTR(-ENOMEM);
- trace_pnfs_update_layout(ino, pos, count, iomode, lo, NULL,
- PNFS_UPDATE_LAYOUT_NOMEM);
- nfs_layoutget_end(lo);
- goto out_put_layout_hdr;
- }
- lgp->lo = lo;
- pnfs_get_layout_hdr(lo);
- 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;
- case -ENODATA:
- /* The server returned NFS4ERR_LAYOUTUNAVAILABLE */
- pnfs_layout_set_fail_bit(
- lo, pnfs_iomode_to_fail_bit(iomode));
- lseg = NULL;
- goto out_put_layout_hdr;
- 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, nfs_io_gfp_mask());
- 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,
- nfs_io_gfp_mask());
- if (!lgp) {
- pnfs_clear_first_layoutget(lo);
- nfs_layoutget_end(lo);
- pnfs_put_layout_hdr(lo);
- return;
- }
- lgp->lo = lo;
- 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 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;
- lgp = pnfs_alloc_init_layoutget_args(ino, ctx, ¤t_stateid, &rng,
- nfs_io_gfp_mask());
- 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->lgp)
- 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->lo) {
- lo = _pnfs_grab_empty_layout(ino, ctx);
- if (!lo)
- return;
- lgp->lo = lo;
- } else
- lo = lgp->lo;
- 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) {
- if (lgp->lo) {
- pnfs_clear_first_layoutget(lgp->lo);
- nfs_layoutget_end(lgp->lo);
- }
- pnfs_layoutget_free(lgp);
- }
- }
- struct pnfs_layout_segment *
- pnfs_layout_process(struct nfs4_layoutget *lgp)
- {
- struct pnfs_layout_hdr *lo = lgp->lo;
- 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 (test_bit(NFS_LAYOUT_DRAIN, &lo->plh_flags) &&
- !pnfs_is_first_layoutget(lo))
- goto out_forget;
- 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)) {
- if (!pnfs_layout_is_valid(lo))
- lo->plh_barrier = 0;
- dprintk("%s forget reply due to sequence\n", __func__);
- goto out_forget;
- }
- pnfs_set_layout_stateid(lo, &res->stateid, lgp->cred, false);
- } else if (pnfs_layout_is_valid(lo)) {
- /*
- * We got an entirely new state ID. Mark all segments for the
- * inode invalid, and retry the layoutget
- */
- struct pnfs_layout_range range = {
- .iomode = IOMODE_ANY,
- .length = NFS4_MAX_UINT64,
- };
- pnfs_mark_matching_lsegs_return(lo, &free_me, &range, 0);
- goto out_forget;
- } else {
- /* We have a completely new layout */
- pnfs_set_layout_stateid(lo, &res->stateid, lgp->cred, true);
- }
- 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);
- }
- /**
- * 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;
- struct nfs_server *server = NFS_SERVER(lo->plh_inode);
- int remaining = 0;
- dprintk("%s:Begin lo %p\n", __func__, lo);
- assert_spin_locked(&lo->plh_inode->i_lock);
- if (test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags))
- tmp_list = &lo->plh_return_segs;
- 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 (test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags))
- tmp_list = &lo->plh_return_segs;
- if (mark_lseg_invalid(lseg, tmp_list))
- continue;
- remaining++;
- set_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags);
- pnfs_lseg_cancel_io(server, lseg);
- }
- 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;
- }
- static void
- pnfs_mark_layout_for_return(struct inode *inode,
- const struct pnfs_layout_range *range)
- {
- struct pnfs_layout_hdr *lo;
- bool return_now = false;
- spin_lock(&inode->i_lock);
- lo = NFS_I(inode)->layout;
- 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) {
- const struct cred *cred;
- nfs4_stateid stateid;
- enum pnfs_iomode iomode;
- return_now = pnfs_prepare_layoutreturn(lo, &stateid, &cred, &iomode);
- spin_unlock(&inode->i_lock);
- if (return_now)
- pnfs_send_layoutreturn(lo, &stateid, &cred, iomode, false);
- } else {
- spin_unlock(&inode->i_lock);
- nfs_commit_inode(inode, 0);
- }
- }
- void pnfs_error_mark_layout_for_return(struct inode *inode,
- struct pnfs_layout_segment *lseg)
- {
- struct pnfs_layout_range range = {
- .iomode = lseg->pls_range.iomode,
- .offset = 0,
- .length = NFS4_MAX_UINT64,
- };
- pnfs_mark_layout_for_return(inode, &range);
- }
- EXPORT_SYMBOL_GPL(pnfs_error_mark_layout_for_return);
- static bool
- pnfs_layout_can_be_returned(struct pnfs_layout_hdr *lo)
- {
- return pnfs_layout_is_valid(lo) &&
- !test_bit(NFS_LAYOUT_INODE_FREEING, &lo->plh_flags) &&
- !test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags);
- }
- static struct pnfs_layout_segment *
- pnfs_find_first_lseg(struct pnfs_layout_hdr *lo,
- const struct pnfs_layout_range *range,
- enum pnfs_iomode iomode)
- {
- struct pnfs_layout_segment *lseg;
- list_for_each_entry(lseg, &lo->plh_segs, pls_list) {
- if (!test_bit(NFS_LSEG_VALID, &lseg->pls_flags))
- continue;
- if (test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags))
- continue;
- if (lseg->pls_range.iomode != iomode && iomode != IOMODE_ANY)
- continue;
- if (pnfs_lseg_range_intersecting(&lseg->pls_range, range))
- return lseg;
- }
- return NULL;
- }
- /* Find open file states whose mode matches that of the range */
- static bool
- pnfs_should_return_unused_layout(struct pnfs_layout_hdr *lo,
- const struct pnfs_layout_range *range)
- {
- struct list_head *head;
- struct nfs_open_context *ctx;
- fmode_t mode = 0;
- if (!pnfs_layout_can_be_returned(lo) ||
- !pnfs_find_first_lseg(lo, range, range->iomode))
- return false;
- head = &NFS_I(lo->plh_inode)->open_files;
- list_for_each_entry_rcu(ctx, head, list) {
- if (ctx->state)
- mode |= ctx->state->state & (FMODE_READ|FMODE_WRITE);
- }
- switch (range->iomode) {
- default:
- break;
- case IOMODE_READ:
- mode &= ~FMODE_WRITE;
- break;
- case IOMODE_RW:
- if (pnfs_find_first_lseg(lo, range, IOMODE_READ))
- mode &= ~FMODE_READ;
- }
- return mode == 0;
- }
- static int pnfs_layout_return_unused_byserver(struct nfs_server *server,
- void *data)
- {
- const struct pnfs_layout_range *range = data;
- const struct cred *cred;
- struct pnfs_layout_hdr *lo;
- struct inode *inode;
- nfs4_stateid stateid;
- enum pnfs_iomode iomode;
- restart:
- rcu_read_lock();
- list_for_each_entry_rcu(lo, &server->layouts, plh_layouts) {
- inode = lo->plh_inode;
- if (!inode || !pnfs_layout_can_be_returned(lo) ||
- test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags))
- continue;
- spin_lock(&inode->i_lock);
- if (!lo->plh_inode ||
- !pnfs_should_return_unused_layout(lo, range)) {
- spin_unlock(&inode->i_lock);
- continue;
- }
- pnfs_get_layout_hdr(lo);
- pnfs_set_plh_return_info(lo, range->iomode, 0);
- if (pnfs_mark_matching_lsegs_return(lo, &lo->plh_return_segs,
- range, 0) != 0 ||
- !pnfs_prepare_layoutreturn(lo, &stateid, &cred, &iomode)) {
- spin_unlock(&inode->i_lock);
- rcu_read_unlock();
- pnfs_put_layout_hdr(lo);
- cond_resched();
- goto restart;
- }
- spin_unlock(&inode->i_lock);
- rcu_read_unlock();
- pnfs_send_layoutreturn(lo, &stateid, &cred, iomode, false);
- pnfs_put_layout_hdr(lo);
- cond_resched();
- goto restart;
- }
- rcu_read_unlock();
- return 0;
- }
- void
- pnfs_layout_return_unused_byclid(struct nfs_client *clp,
- enum pnfs_iomode iomode)
- {
- struct pnfs_layout_range range = {
- .iomode = iomode,
- .offset = 0,
- .length = NFS4_MAX_UINT64,
- };
- nfs_client_for_each_server(clp, pnfs_layout_return_unused_byserver,
- &range);
- }
- 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.
- */
- 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;
- }
- }
- EXPORT_SYMBOL_GPL(pnfs_generic_pg_check_range);
- void
- pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
- {
- u64 rd_size;
- 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,
- nfs_io_gfp_mask());
- 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, nfs_io_gfp_mask());
- 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);
- 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);
- break;
- 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,
- unsigned int mirror_idx)
- {
- 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);
- pgio.pg_mirror_idx = mirror_idx;
- 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);
- break;
- 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|TASK_FREEZABLE_UNSAFE);
- if (status)
- goto out;
- }
- status = -ENOMEM;
- /* Note kzalloc ensures data->res.seq_res.sr_slot == NULL */
- data = kzalloc(sizeof(*data), nfs_io_gfp_mask());
- 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);
- data->cred = get_cred(nfsi->layout->plh_lc_cred);
- spin_unlock(&inode->i_lock);
- data->args.inode = inode;
- 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), nfs_io_gfp_mask());
- 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);
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