/*
* 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);
static int pnfs_layout_return_on_reboot(struct pnfs_layout_hdr *lo);
/* 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_mark_layout_stateid_return(struct pnfs_layout_hdr *lo,
struct list_head *lseg_list,
enum pnfs_iomode iomode, u32 seq)
{
struct pnfs_layout_range range = {
.iomode = iomode,
.length = NFS4_MAX_UINT64,
};
return pnfs_mark_matching_lsegs_return(lo, lseg_list, &range, seq);
}
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_return(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 (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,
enum pnfs_layout_destroy_mode mode)
{
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 (mode == PNFS_LAYOUT_FILE_BULK_RETURN) {
pnfs_mark_layout_stateid_return(lo, &lseg_list,
IOMODE_ANY, 0);
} else if (pnfs_mark_layout_stateid_invalid(lo, &lseg_list)) {
if (mode == PNFS_LAYOUT_BULK_RETURN)
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_layout_destroy_byfsid(struct nfs_client *clp, struct nfs_fsid *fsid,
enum pnfs_layout_destroy_mode mode)
{
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);
return pnfs_layout_free_bulk_destroy_list(&layout_list, mode);
}
static void pnfs_layout_build_destroy_list_byclient(struct nfs_client *clp,
struct list_head *list)
{
struct nfs_server *server;
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,
list) != 0)
goto restart;
}
rcu_read_unlock();
spin_unlock(&clp->cl_lock);
}
static int pnfs_layout_do_destroy_byclid(struct nfs_client *clp,
struct list_head *list,
enum pnfs_layout_destroy_mode mode)
{
pnfs_layout_build_destroy_list_byclient(clp, list);
return pnfs_layout_free_bulk_destroy_list(list, mode);
}
int pnfs_layout_destroy_byclid(struct nfs_client *clp,
enum pnfs_layout_destroy_mode mode)
{
LIST_HEAD(layout_list);
return pnfs_layout_do_destroy_byclid(clp, &layout_list, mode);
}
/*
* 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_layout_destroy_byclid(clp, PNFS_LAYOUT_INVALIDATE);
}
static void pnfs_layout_build_recover_list_byclient(struct nfs_client *clp,
struct list_head *list)
{
struct nfs_server *server;
spin_lock(&clp->cl_lock);
rcu_read_lock();
restart:
list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
if (!(server->caps & NFS_CAP_REBOOT_LAYOUTRETURN))
continue;
if (pnfs_layout_bulk_destroy_byserver_locked(clp, server,
list) != 0)
goto restart;
}
rcu_read_unlock();
spin_unlock(&clp->cl_lock);
}
static int pnfs_layout_bulk_list_reboot(struct list_head *list)
{
struct pnfs_layout_hdr *lo;
struct nfs_server *server;
int ret;
list_for_each_entry(lo, list, plh_bulk_destroy) {
server = NFS_SERVER(lo->plh_inode);
ret = pnfs_layout_return_on_reboot(lo);
switch (ret) {
case 0:
continue;
case -NFS4ERR_BAD_STATEID:
server->caps &= ~NFS_CAP_REBOOT_LAYOUTRETURN;
break;
case -NFS4ERR_NO_GRACE:
break;
default:
goto err;
}
break;
}
return 0;
err:
return ret;
}
int pnfs_layout_handle_reboot(struct nfs_client *clp)
{
LIST_HEAD(list);
int ret = 0, ret2;
pnfs_layout_build_recover_list_byclient(clp, &list);
if (!list_empty(&list))
ret = pnfs_layout_bulk_list_reboot(&list);
ret2 = pnfs_layout_do_destroy_byclid(clp, &list,
PNFS_LAYOUT_INVALIDATE);
if (!ret)
ret = ret2;
return (ret == 0) ? 0 : -EAGAIN;
}
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);
}
}
static void
pnfs_layoutreturn_retry_later_locked(struct pnfs_layout_hdr *lo,
const nfs4_stateid *arg_stateid,
const struct pnfs_layout_range *range)
{
const struct pnfs_layout_segment *lseg;
u32 seq = be32_to_cpu(arg_stateid->seqid);
if (pnfs_layout_is_valid(lo) &&
nfs4_stateid_match_other(&lo->plh_stateid, arg_stateid)) {
list_for_each_entry(lseg, &lo->plh_return_segs, pls_list) {
if (pnfs_seqid_is_newer(lseg->pls_seq, seq) ||
!pnfs_should_free_range(&lseg->pls_range, range))
continue;
pnfs_set_plh_return_info(lo, range->iomode, seq);
break;
}
}
}
void pnfs_layoutreturn_retry_later(struct pnfs_layout_hdr *lo,
const nfs4_stateid *arg_stateid,
const struct pnfs_layout_range *range)
{
struct inode *inode = lo->plh_inode;
spin_lock(&inode->i_lock);
pnfs_layoutreturn_retry_later_locked(lo, arg_stateid, range);
pnfs_clear_layoutreturn_waitbit(lo);
spin_unlock(&inode->i_lock);
}
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 (!nfs4_stateid_match_other(&lo->plh_stateid, arg_stateid))
goto out_unlock;
if (stateid && pnfs_layout_is_valid(lo)) {
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,
unsigned int flags)
{
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, flags);
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)
{
if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags))
return false;
return pnfs_mark_layout_stateid_return(lo, &lo->plh_return_segs,
lo->plh_return_iomode,
lo->plh_return_seq) != EBUSY;
}
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,
PNFS_FL_LAYOUTRETURN_ASYNC);
}
} 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,
0);
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;
}
static int pnfs_layout_return_on_reboot(struct pnfs_layout_hdr *lo)
{
struct inode *inode = lo->plh_inode;
const struct cred *cred;
spin_lock(&inode->i_lock);
if (!pnfs_layout_is_valid(lo)) {
spin_unlock(&inode->i_lock);
return 0;
}
cred = get_cred(lo->plh_lc_cred);
pnfs_get_layout_hdr(lo);
spin_unlock(&inode->i_lock);
return pnfs_send_layoutreturn(lo, &zero_stateid, &cred, IOMODE_ANY,
PNFS_FL_LAYOUTRETURN_PRIVILEGED);
}
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, 0);
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_BADSESSION:
case -NFS4ERR_DEADSESSION:
case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
case -NFS4ERR_NOMATCHING_LAYOUT:
spin_lock(&inode->i_lock);
pnfs_layoutreturn_retry_later_locked(lo, &args->stateid,
&args->range);
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;
struct nfs4_exception exception = {
.inode = ino,
};
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:
if (!nfs4_valid_open_stateid(ctx->state)) {
trace_pnfs_update_layout(ino, pos, count,
iomode, lo, lseg,
PNFS_UPDATE_LAYOUT_INVALID_OPEN);
lseg = ERR_PTR(-EIO);
goto out;
}
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, &exception);
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 (!exception.retry)
goto out_put_layout_hdr;
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,
PNFS_FL_LAYOUTRETURN_ASYNC);
} 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,
PNFS_FL_LAYOUTRETURN_ASYNC);
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);
}
/* Check if we have we have a valid layout but if there isn't an intersection
* between the request and the pgio->pg_lseg, put this pgio->pg_lseg away.
*/
void
pnfs_generic_pg_check_layout(struct nfs_pageio_descriptor *pgio,
struct nfs_page *req)
{
if (pgio->pg_lseg == NULL ||
(test_bit(NFS_LSEG_VALID, &pgio->pg_lseg->pls_flags) &&
pnfs_lseg_request_intersecting(pgio->pg_lseg, req)))
return;
pnfs_put_lseg(pgio->pg_lseg);
pgio->pg_lseg = NULL;
}
EXPORT_SYMBOL_GPL(pnfs_generic_pg_check_layout);
void
pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
{
u64 rd_size;
pnfs_generic_pg_check_layout(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,
req_offset(req));
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, 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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