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3323 lines
87 KiB
3323 lines
87 KiB
/* |
|
* 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; |
|
} |
|
|
|
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 |
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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 = 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); |
|
if (seq != 0) { |
|
WARN_ON_ONCE(lo->plh_return_seq != 0 && lo->plh_return_seq != 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); |
|
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)) { |
|
if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags)) { |
|
spin_unlock(&inode->i_lock); |
|
return; |
|
} |
|
pnfs_get_layout_hdr(lo); |
|
pnfs_layout_remove_lseg(lo, lseg); |
|
if (pnfs_cache_lseg_for_layoutreturn(lo, lseg)) |
|
lseg = NULL; |
|
spin_unlock(&inode->i_lock); |
|
pnfs_free_lseg(lseg); |
|
pnfs_put_layout_hdr(lo); |
|
} |
|
} |
|
EXPORT_SYMBOL_GPL(pnfs_put_lseg); |
|
|
|
/* |
|
* is l2 fully contained in l1? |
|
* start1 end1 |
|
* [----------------------------------) |
|
* start2 end2 |
|
* [----------------) |
|
*/ |
|
static bool |
|
pnfs_lseg_range_contained(const struct pnfs_layout_range *l1, |
|
const struct pnfs_layout_range *l2) |
|
{ |
|
u64 start1 = l1->offset; |
|
u64 end1 = pnfs_end_offset(start1, l1->length); |
|
u64 start2 = l2->offset; |
|
u64 end2 = pnfs_end_offset(start2, l2->length); |
|
|
|
return (start1 <= start2) && (end1 >= end2); |
|
} |
|
|
|
static bool pnfs_lseg_dec_and_remove_zero(struct pnfs_layout_segment *lseg, |
|
struct list_head *tmp_list) |
|
{ |
|
if (!refcount_dec_and_test(&lseg->pls_refcount)) |
|
return false; |
|
pnfs_layout_remove_lseg(lseg->pls_layout, lseg); |
|
list_add(&lseg->pls_list, tmp_list); |
|
return true; |
|
} |
|
|
|
/* Returns 1 if lseg is removed from list, 0 otherwise */ |
|
static int mark_lseg_invalid(struct pnfs_layout_segment *lseg, |
|
struct list_head *tmp_list) |
|
{ |
|
int rv = 0; |
|
|
|
if (test_and_clear_bit(NFS_LSEG_VALID, &lseg->pls_flags)) { |
|
/* Remove the reference keeping the lseg in the |
|
* list. It will now be removed when all |
|
* outstanding io is finished. |
|
*/ |
|
dprintk("%s: lseg %p ref %d\n", __func__, lseg, |
|
refcount_read(&lseg->pls_refcount)); |
|
if (pnfs_lseg_dec_and_remove_zero(lseg, tmp_list)) |
|
rv = 1; |
|
} |
|
return rv; |
|
} |
|
|
|
static bool |
|
pnfs_should_free_range(const struct pnfs_layout_range *lseg_range, |
|
const struct pnfs_layout_range *recall_range) |
|
{ |
|
return (recall_range->iomode == IOMODE_ANY || |
|
lseg_range->iomode == recall_range->iomode) && |
|
pnfs_lseg_range_intersecting(lseg_range, recall_range); |
|
} |
|
|
|
static bool |
|
pnfs_match_lseg_recall(const struct pnfs_layout_segment *lseg, |
|
const struct pnfs_layout_range *recall_range, |
|
u32 seq) |
|
{ |
|
if (seq != 0 && pnfs_seqid_is_newer(lseg->pls_seq, seq)) |
|
return false; |
|
if (recall_range == NULL) |
|
return true; |
|
return pnfs_should_free_range(&lseg->pls_range, recall_range); |
|
} |
|
|
|
/** |
|
* pnfs_mark_matching_lsegs_invalid - tear down lsegs or mark them for later |
|
* @lo: layout header containing the lsegs |
|
* @tmp_list: list head where doomed lsegs should go |
|
* @recall_range: optional recall range argument to match (may be NULL) |
|
* @seq: only invalidate lsegs obtained prior to this sequence (may be 0) |
|
* |
|
* Walk the list of lsegs in the layout header, and tear down any that should |
|
* be destroyed. If "recall_range" is specified then the segment must match |
|
* that range. If "seq" is non-zero, then only match segments that were handed |
|
* out at or before that sequence. |
|
* |
|
* Returns number of matching invalid lsegs remaining in list after scanning |
|
* it and purging them. |
|
*/ |
|
int |
|
pnfs_mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo, |
|
struct list_head *tmp_list, |
|
const struct pnfs_layout_range *recall_range, |
|
u32 seq) |
|
{ |
|
struct pnfs_layout_segment *lseg, *next; |
|
int remaining = 0; |
|
|
|
dprintk("%s:Begin lo %p\n", __func__, lo); |
|
|
|
if (list_empty(&lo->plh_segs)) |
|
return 0; |
|
list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list) |
|
if (pnfs_match_lseg_recall(lseg, recall_range, seq)) { |
|
dprintk("%s: freeing lseg %p iomode %d seq %u " |
|
"offset %llu length %llu\n", __func__, |
|
lseg, lseg->pls_range.iomode, lseg->pls_seq, |
|
lseg->pls_range.offset, lseg->pls_range.length); |
|
if (!mark_lseg_invalid(lseg, tmp_list)) |
|
remaining++; |
|
} |
|
dprintk("%s:Return %i\n", __func__, remaining); |
|
return remaining; |
|
} |
|
|
|
static void |
|
pnfs_free_returned_lsegs(struct pnfs_layout_hdr *lo, |
|
struct list_head *free_me, |
|
const struct pnfs_layout_range *range, |
|
u32 seq) |
|
{ |
|
struct pnfs_layout_segment *lseg, *next; |
|
|
|
list_for_each_entry_safe(lseg, next, &lo->plh_return_segs, pls_list) { |
|
if (pnfs_match_lseg_recall(lseg, range, seq)) |
|
list_move_tail(&lseg->pls_list, free_me); |
|
} |
|
} |
|
|
|
/* note free_me must contain lsegs from a single layout_hdr */ |
|
void |
|
pnfs_free_lseg_list(struct list_head *free_me) |
|
{ |
|
struct pnfs_layout_segment *lseg, *tmp; |
|
|
|
if (list_empty(free_me)) |
|
return; |
|
|
|
list_for_each_entry_safe(lseg, tmp, free_me, pls_list) { |
|
list_del(&lseg->pls_list); |
|
pnfs_free_lseg(lseg); |
|
} |
|
} |
|
|
|
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 !pnfs_seqid_is_newer(seqid, lo->plh_barrier) && lo->plh_barrier; |
|
} |
|
|
|
/* lget is set to 1 if called from inside send_layoutget call chain */ |
|
static bool |
|
pnfs_layoutgets_blocked(const struct pnfs_layout_hdr *lo) |
|
{ |
|
return lo->plh_block_lgets || |
|
test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags); |
|
} |
|
|
|
static struct nfs_server * |
|
pnfs_find_server(struct inode *inode, struct nfs_open_context *ctx) |
|
{ |
|
struct nfs_server *server; |
|
|
|
if (inode) { |
|
server = NFS_SERVER(inode); |
|
} else { |
|
struct dentry *parent_dir = dget_parent(ctx->dentry); |
|
server = NFS_SERVER(parent_dir->d_inode); |
|
dput(parent_dir); |
|
} |
|
return server; |
|
} |
|
|
|
static void nfs4_free_pages(struct page **pages, size_t size) |
|
{ |
|
int i; |
|
|
|
if (!pages) |
|
return; |
|
|
|
for (i = 0; i < size; i++) { |
|
if (!pages[i]) |
|
break; |
|
__free_page(pages[i]); |
|
} |
|
kfree(pages); |
|
} |
|
|
|
static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags) |
|
{ |
|
struct page **pages; |
|
int i; |
|
|
|
pages = kmalloc_array(size, sizeof(struct page *), gfp_flags); |
|
if (!pages) { |
|
dprintk("%s: can't alloc array of %zu pages\n", __func__, size); |
|
return NULL; |
|
} |
|
|
|
for (i = 0; i < size; i++) { |
|
pages[i] = alloc_page(gfp_flags); |
|
if (!pages[i]) { |
|
dprintk("%s: failed to allocate page\n", __func__); |
|
nfs4_free_pages(pages, i); |
|
return NULL; |
|
} |
|
} |
|
|
|
return pages; |
|
} |
|
|
|
static struct nfs4_layoutget * |
|
pnfs_alloc_init_layoutget_args(struct inode *ino, |
|
struct nfs_open_context *ctx, |
|
const nfs4_stateid *stateid, |
|
const struct pnfs_layout_range *range, |
|
gfp_t gfp_flags) |
|
{ |
|
struct nfs_server *server = pnfs_find_server(ino, ctx); |
|
size_t max_reply_sz = server->pnfs_curr_ld->max_layoutget_response; |
|
size_t max_pages = max_response_pages(server); |
|
struct nfs4_layoutget *lgp; |
|
|
|
dprintk("--> %s\n", __func__); |
|
|
|
lgp = kzalloc(sizeof(*lgp), gfp_flags); |
|
if (lgp == NULL) |
|
return NULL; |
|
|
|
if (max_reply_sz) { |
|
size_t npages = (max_reply_sz + PAGE_SIZE - 1) >> PAGE_SHIFT; |
|
if (npages < max_pages) |
|
max_pages = npages; |
|
} |
|
|
|
lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags); |
|
if (!lgp->args.layout.pages) { |
|
kfree(lgp); |
|
return NULL; |
|
} |
|
lgp->args.layout.pglen = max_pages * PAGE_SIZE; |
|
lgp->res.layoutp = &lgp->args.layout; |
|
|
|
/* Don't confuse uninitialised result and success */ |
|
lgp->res.status = -NFS4ERR_DELAY; |
|
|
|
lgp->args.minlength = PAGE_SIZE; |
|
if (lgp->args.minlength > range->length) |
|
lgp->args.minlength = range->length; |
|
if (ino) { |
|
loff_t i_size = i_size_read(ino); |
|
|
|
if (range->iomode == IOMODE_READ) { |
|
if (range->offset >= i_size) |
|
lgp->args.minlength = 0; |
|
else if (i_size - range->offset < lgp->args.minlength) |
|
lgp->args.minlength = i_size - range->offset; |
|
} |
|
} |
|
lgp->args.maxcount = PNFS_LAYOUT_MAXSIZE; |
|
pnfs_copy_range(&lgp->args.range, range); |
|
lgp->args.type = server->pnfs_curr_ld->id; |
|
lgp->args.inode = ino; |
|
lgp->args.ctx = get_nfs_open_context(ctx); |
|
nfs4_stateid_copy(&lgp->args.stateid, stateid); |
|
lgp->gfp_flags = gfp_flags; |
|
lgp->cred = 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), GFP_NOFS); |
|
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); |
|
} |
|
|
|
static void nfs_layoutget_begin(struct pnfs_layout_hdr *lo) |
|
{ |
|
atomic_inc(&lo->plh_outstanding); |
|
} |
|
|
|
static void nfs_layoutget_end(struct pnfs_layout_hdr *lo) |
|
{ |
|
if (atomic_dec_and_test(&lo->plh_outstanding)) |
|
wake_up_var(&lo->plh_outstanding); |
|
} |
|
|
|
static 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); |
|
trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, |
|
PNFS_UPDATE_LAYOUT_NOMEM); |
|
goto out; |
|
} |
|
|
|
/* Do we even need to bother with this? */ |
|
if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) { |
|
trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, |
|
PNFS_UPDATE_LAYOUT_BULK_RECALL); |
|
dprintk("%s matches recall, use MDS\n", __func__); |
|
goto out_unlock; |
|
} |
|
|
|
/* if LAYOUTGET already failed once we don't try again */ |
|
if (pnfs_layout_io_test_failed(lo, iomode)) { |
|
trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, |
|
PNFS_UPDATE_LAYOUT_IO_TEST_FAIL); |
|
goto out_unlock; |
|
} |
|
|
|
/* |
|
* If the layout segment list is empty, but there are outstanding |
|
* layoutget calls, then they might be subject to a layoutrecall. |
|
*/ |
|
if ((list_empty(&lo->plh_segs) || !pnfs_layout_is_valid(lo)) && |
|
atomic_read(&lo->plh_outstanding) != 0) { |
|
spin_unlock(&ino->i_lock); |
|
lseg = ERR_PTR(wait_var_event_killable(&lo->plh_outstanding, |
|
!atomic_read(&lo->plh_outstanding))); |
|
if (IS_ERR(lseg)) |
|
goto out_put_layout_hdr; |
|
pnfs_put_layout_hdr(lo); |
|
goto lookup_again; |
|
} |
|
|
|
/* |
|
* 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) { |
|
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; |
|
default: |
|
if (!nfs_error_is_fatal(PTR_ERR(lseg))) { |
|
pnfs_layout_clear_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode)); |
|
lseg = NULL; |
|
} |
|
goto out_put_layout_hdr; |
|
} |
|
if (lseg) { |
|
if (first) |
|
pnfs_clear_first_layoutget(lo); |
|
trace_pnfs_update_layout(ino, pos, count, |
|
iomode, lo, lseg, PNFS_UPDATE_LAYOUT_RETRY); |
|
pnfs_put_layout_hdr(lo); |
|
goto lookup_again; |
|
} |
|
} else { |
|
pnfs_layout_clear_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode)); |
|
} |
|
|
|
out_put_layout_hdr: |
|
if (first) |
|
pnfs_clear_first_layoutget(lo); |
|
trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, |
|
PNFS_UPDATE_LAYOUT_EXIT); |
|
pnfs_put_layout_hdr(lo); |
|
out: |
|
dprintk("%s: inode %s/%llu pNFS layout segment %s for " |
|
"(%s, offset: %llu, length: %llu)\n", |
|
__func__, ino->i_sb->s_id, |
|
(unsigned long long)NFS_FILEID(ino), |
|
IS_ERR_OR_NULL(lseg) ? "not found" : "found", |
|
iomode==IOMODE_RW ? "read/write" : "read-only", |
|
(unsigned long long)pos, |
|
(unsigned long long)count); |
|
return lseg; |
|
out_unlock: |
|
spin_unlock(&ino->i_lock); |
|
goto out_put_layout_hdr; |
|
} |
|
EXPORT_SYMBOL_GPL(pnfs_update_layout); |
|
|
|
static bool |
|
pnfs_sanity_check_layout_range(struct pnfs_layout_range *range) |
|
{ |
|
switch (range->iomode) { |
|
case IOMODE_READ: |
|
case IOMODE_RW: |
|
break; |
|
default: |
|
return false; |
|
} |
|
if (range->offset == NFS4_MAX_UINT64) |
|
return false; |
|
if (range->length == 0) |
|
return false; |
|
if (range->length != NFS4_MAX_UINT64 && |
|
range->length > NFS4_MAX_UINT64 - range->offset) |
|
return false; |
|
return true; |
|
} |
|
|
|
static struct pnfs_layout_hdr * |
|
_pnfs_grab_empty_layout(struct inode *ino, struct nfs_open_context *ctx) |
|
{ |
|
struct pnfs_layout_hdr *lo; |
|
|
|
spin_lock(&ino->i_lock); |
|
lo = pnfs_find_alloc_layout(ino, ctx, GFP_KERNEL); |
|
if (!lo) |
|
goto out_unlock; |
|
if (!test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags)) |
|
goto out_unlock; |
|
if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) |
|
goto out_unlock; |
|
if (pnfs_layoutgets_blocked(lo)) |
|
goto out_unlock; |
|
if (test_and_set_bit(NFS_LAYOUT_FIRST_LAYOUTGET, &lo->plh_flags)) |
|
goto out_unlock; |
|
nfs_layoutget_begin(lo); |
|
spin_unlock(&ino->i_lock); |
|
_add_to_server_list(lo, NFS_SERVER(ino)); |
|
return lo; |
|
|
|
out_unlock: |
|
spin_unlock(&ino->i_lock); |
|
pnfs_put_layout_hdr(lo); |
|
return NULL; |
|
} |
|
|
|
static void _lgopen_prepare_attached(struct nfs4_opendata *data, |
|
struct nfs_open_context *ctx) |
|
{ |
|
struct inode *ino = data->dentry->d_inode; |
|
struct pnfs_layout_range rng = { |
|
.iomode = (data->o_arg.fmode & FMODE_WRITE) ? |
|
IOMODE_RW: IOMODE_READ, |
|
.offset = 0, |
|
.length = NFS4_MAX_UINT64, |
|
}; |
|
struct nfs4_layoutget *lgp; |
|
struct pnfs_layout_hdr *lo; |
|
|
|
/* Heuristic: don't send layoutget if we have cached data */ |
|
if (rng.iomode == IOMODE_READ && |
|
(i_size_read(ino) == 0 || ino->i_mapping->nrpages != 0)) |
|
return; |
|
|
|
lo = _pnfs_grab_empty_layout(ino, ctx); |
|
if (!lo) |
|
return; |
|
lgp = pnfs_alloc_init_layoutget_args(ino, ctx, ¤t_stateid, |
|
&rng, GFP_KERNEL); |
|
if (!lgp) { |
|
pnfs_clear_first_layoutget(lo); |
|
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, GFP_KERNEL); |
|
if (!lgp) |
|
return; |
|
data->lgp = lgp; |
|
data->o_arg.lg_args = &lgp->args; |
|
data->o_res.lg_res = &lgp->res; |
|
} |
|
|
|
void pnfs_lgopen_prepare(struct nfs4_opendata *data, |
|
struct nfs_open_context *ctx) |
|
{ |
|
struct nfs_server *server = NFS_SERVER(data->dir->d_inode); |
|
|
|
if (!(pnfs_enabled_sb(server) && |
|
server->pnfs_curr_ld->flags & PNFS_LAYOUTGET_ON_OPEN)) |
|
return; |
|
/* Could check on max_ops, but currently hardcoded high enough */ |
|
if (!nfs_server_capable(data->dir->d_inode, NFS_CAP_LGOPEN)) |
|
return; |
|
if (data->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 (!pnfs_layout_is_valid(lo) && !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; |
|
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); |
|
} |
|
|
|
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; |
|
struct pnfs_layout_hdr *lo; |
|
struct inode *inode; |
|
restart: |
|
rcu_read_lock(); |
|
list_for_each_entry_rcu(lo, &server->layouts, plh_layouts) { |
|
if (!pnfs_layout_can_be_returned(lo) || |
|
test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags)) |
|
continue; |
|
inode = lo->plh_inode; |
|
spin_lock(&inode->i_lock); |
|
if (!pnfs_should_return_unused_layout(lo, range)) { |
|
spin_unlock(&inode->i_lock); |
|
continue; |
|
} |
|
spin_unlock(&inode->i_lock); |
|
inode = pnfs_grab_inode_layout_hdr(lo); |
|
if (!inode) |
|
continue; |
|
rcu_read_unlock(); |
|
pnfs_mark_layout_for_return(inode, range); |
|
iput(inode); |
|
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, |
|
GFP_KERNEL); |
|
if (IS_ERR(pgio->pg_lseg)) { |
|
pgio->pg_error = PTR_ERR(pgio->pg_lseg); |
|
pgio->pg_lseg = NULL; |
|
return; |
|
} |
|
} |
|
/* If no lseg, fall back to read through mds */ |
|
if (pgio->pg_lseg == NULL) |
|
nfs_pageio_reset_read_mds(pgio); |
|
|
|
} |
|
EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_read); |
|
|
|
void |
|
pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio, |
|
struct nfs_page *req, u64 wb_size) |
|
{ |
|
pnfs_generic_pg_check_layout(pgio); |
|
pnfs_generic_pg_check_range(pgio, req); |
|
if (pgio->pg_lseg == NULL) { |
|
pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode, |
|
nfs_req_openctx(req), |
|
req_offset(req), |
|
wb_size, |
|
IOMODE_RW, |
|
false, |
|
GFP_KERNEL); |
|
if (IS_ERR(pgio->pg_lseg)) { |
|
pgio->pg_error = PTR_ERR(pgio->pg_lseg); |
|
pgio->pg_lseg = NULL; |
|
return; |
|
} |
|
} |
|
/* If no lseg, fall back to write through mds */ |
|
if (pgio->pg_lseg == NULL) |
|
nfs_pageio_reset_write_mds(pgio); |
|
} |
|
EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_write); |
|
|
|
void |
|
pnfs_generic_pg_cleanup(struct nfs_pageio_descriptor *desc) |
|
{ |
|
if (desc->pg_lseg) { |
|
pnfs_put_lseg(desc->pg_lseg); |
|
desc->pg_lseg = NULL; |
|
} |
|
} |
|
EXPORT_SYMBOL_GPL(pnfs_generic_pg_cleanup); |
|
|
|
/* |
|
* Return 0 if @req cannot be coalesced into @pgio, otherwise return the number |
|
* of bytes (maximum @req->wb_bytes) that can be coalesced. |
|
*/ |
|
size_t |
|
pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio, |
|
struct nfs_page *prev, struct nfs_page *req) |
|
{ |
|
unsigned int size; |
|
u64 seg_end, req_start, seg_left; |
|
|
|
size = nfs_generic_pg_test(pgio, prev, req); |
|
if (!size) |
|
return 0; |
|
|
|
/* |
|
* 'size' contains the number of bytes left in the current page (up |
|
* to the original size asked for in @req->wb_bytes). |
|
* |
|
* Calculate how many bytes are left in the layout segment |
|
* and if there are less bytes than 'size', return that instead. |
|
* |
|
* Please also note that 'end_offset' is actually the offset of the |
|
* first byte that lies outside the pnfs_layout_range. FIXME? |
|
* |
|
*/ |
|
if (pgio->pg_lseg) { |
|
seg_end = pnfs_end_offset(pgio->pg_lseg->pls_range.offset, |
|
pgio->pg_lseg->pls_range.length); |
|
req_start = req_offset(req); |
|
|
|
/* start of request is past the last byte of this segment */ |
|
if (req_start >= seg_end) |
|
return 0; |
|
|
|
/* adjust 'size' iff there are fewer bytes left in the |
|
* segment than what nfs_generic_pg_test returned */ |
|
seg_left = seg_end - req_start; |
|
if (seg_left < size) |
|
size = (unsigned int)seg_left; |
|
} |
|
|
|
return size; |
|
} |
|
EXPORT_SYMBOL_GPL(pnfs_generic_pg_test); |
|
|
|
int pnfs_write_done_resend_to_mds(struct nfs_pgio_header *hdr) |
|
{ |
|
struct nfs_pageio_descriptor pgio; |
|
|
|
/* Resend all requests through the MDS */ |
|
nfs_pageio_init_write(&pgio, hdr->inode, FLUSH_STABLE, true, |
|
hdr->completion_ops); |
|
set_bit(NFS_CONTEXT_RESEND_WRITES, &hdr->args.context->flags); |
|
return nfs_pageio_resend(&pgio, hdr); |
|
} |
|
EXPORT_SYMBOL_GPL(pnfs_write_done_resend_to_mds); |
|
|
|
static void pnfs_ld_handle_write_error(struct nfs_pgio_header *hdr) |
|
{ |
|
|
|
dprintk("pnfs write error = %d\n", hdr->pnfs_error); |
|
if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags & |
|
PNFS_LAYOUTRET_ON_ERROR) { |
|
pnfs_return_layout(hdr->inode); |
|
} |
|
if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) |
|
hdr->task.tk_status = pnfs_write_done_resend_to_mds(hdr); |
|
} |
|
|
|
/* |
|
* Called by non rpc-based layout drivers |
|
*/ |
|
void pnfs_ld_write_done(struct nfs_pgio_header *hdr) |
|
{ |
|
if (likely(!hdr->pnfs_error)) { |
|
pnfs_set_layoutcommit(hdr->inode, hdr->lseg, |
|
hdr->mds_offset + hdr->res.count); |
|
hdr->mds_ops->rpc_call_done(&hdr->task, hdr); |
|
} |
|
trace_nfs4_pnfs_write(hdr, hdr->pnfs_error); |
|
if (unlikely(hdr->pnfs_error)) |
|
pnfs_ld_handle_write_error(hdr); |
|
hdr->mds_ops->rpc_release(hdr); |
|
} |
|
EXPORT_SYMBOL_GPL(pnfs_ld_write_done); |
|
|
|
static void |
|
pnfs_write_through_mds(struct nfs_pageio_descriptor *desc, |
|
struct nfs_pgio_header *hdr) |
|
{ |
|
struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc); |
|
|
|
if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { |
|
list_splice_tail_init(&hdr->pages, &mirror->pg_list); |
|
nfs_pageio_reset_write_mds(desc); |
|
mirror->pg_recoalesce = 1; |
|
} |
|
hdr->completion_ops->completion(hdr); |
|
} |
|
|
|
static enum pnfs_try_status |
|
pnfs_try_to_write_data(struct nfs_pgio_header *hdr, |
|
const struct rpc_call_ops *call_ops, |
|
struct pnfs_layout_segment *lseg, |
|
int how) |
|
{ |
|
struct inode *inode = hdr->inode; |
|
enum pnfs_try_status trypnfs; |
|
struct nfs_server *nfss = NFS_SERVER(inode); |
|
|
|
hdr->mds_ops = call_ops; |
|
|
|
dprintk("%s: Writing ino:%lu %u@%llu (how %d)\n", __func__, |
|
inode->i_ino, hdr->args.count, hdr->args.offset, how); |
|
trypnfs = nfss->pnfs_curr_ld->write_pagelist(hdr, how); |
|
if (trypnfs != PNFS_NOT_ATTEMPTED) |
|
nfs_inc_stats(inode, NFSIOS_PNFS_WRITE); |
|
dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs); |
|
return trypnfs; |
|
} |
|
|
|
static void |
|
pnfs_do_write(struct nfs_pageio_descriptor *desc, |
|
struct nfs_pgio_header *hdr, int how) |
|
{ |
|
const struct rpc_call_ops *call_ops = desc->pg_rpc_callops; |
|
struct pnfs_layout_segment *lseg = desc->pg_lseg; |
|
enum pnfs_try_status trypnfs; |
|
|
|
trypnfs = pnfs_try_to_write_data(hdr, call_ops, lseg, how); |
|
switch (trypnfs) { |
|
case PNFS_NOT_ATTEMPTED: |
|
pnfs_write_through_mds(desc, hdr); |
|
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); |
|
if (status) |
|
goto out; |
|
} |
|
|
|
status = -ENOMEM; |
|
/* Note kzalloc ensures data->res.seq_res.sr_slot == NULL */ |
|
data = kzalloc(sizeof(*data), GFP_NOFS); |
|
if (!data) |
|
goto clear_layoutcommitting; |
|
|
|
status = 0; |
|
spin_lock(&inode->i_lock); |
|
if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) |
|
goto out_unlock; |
|
|
|
INIT_LIST_HEAD(&data->lseg_list); |
|
pnfs_list_write_lseg(inode, &data->lseg_list); |
|
|
|
end_pos = nfsi->layout->plh_lwb; |
|
|
|
nfs4_stateid_copy(&data->args.stateid, &nfsi->layout->plh_stateid); |
|
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), GFP_NOFS); |
|
if (!thp) { |
|
dprintk("%s mdsthreshold allocation failed\n", __func__); |
|
return NULL; |
|
} |
|
return thp; |
|
} |
|
|
|
#if IS_ENABLED(CONFIG_NFS_V4_2) |
|
int |
|
pnfs_report_layoutstat(struct inode *inode, gfp_t gfp_flags) |
|
{ |
|
struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld; |
|
struct nfs_server *server = NFS_SERVER(inode); |
|
struct nfs_inode *nfsi = NFS_I(inode); |
|
struct nfs42_layoutstat_data *data; |
|
struct pnfs_layout_hdr *hdr; |
|
int status = 0; |
|
|
|
if (!pnfs_enabled_sb(server) || !ld->prepare_layoutstats) |
|
goto out; |
|
|
|
if (!nfs_server_capable(inode, NFS_CAP_LAYOUTSTATS)) |
|
goto out; |
|
|
|
if (test_and_set_bit(NFS_INO_LAYOUTSTATS, &nfsi->flags)) |
|
goto out; |
|
|
|
spin_lock(&inode->i_lock); |
|
if (!NFS_I(inode)->layout) { |
|
spin_unlock(&inode->i_lock); |
|
goto out_clear_layoutstats; |
|
} |
|
hdr = NFS_I(inode)->layout; |
|
pnfs_get_layout_hdr(hdr); |
|
spin_unlock(&inode->i_lock); |
|
|
|
data = kzalloc(sizeof(*data), gfp_flags); |
|
if (!data) { |
|
status = -ENOMEM; |
|
goto out_put; |
|
} |
|
|
|
data->args.fh = NFS_FH(inode); |
|
data->args.inode = inode; |
|
status = ld->prepare_layoutstats(&data->args); |
|
if (status) |
|
goto out_free; |
|
|
|
status = nfs42_proc_layoutstats_generic(NFS_SERVER(inode), data); |
|
|
|
out: |
|
dprintk("%s returns %d\n", __func__, status); |
|
return status; |
|
|
|
out_free: |
|
kfree(data); |
|
out_put: |
|
pnfs_put_layout_hdr(hdr); |
|
out_clear_layoutstats: |
|
smp_mb__before_atomic(); |
|
clear_bit(NFS_INO_LAYOUTSTATS, &nfsi->flags); |
|
smp_mb__after_atomic(); |
|
goto out; |
|
} |
|
EXPORT_SYMBOL_GPL(pnfs_report_layoutstat); |
|
#endif |
|
|
|
unsigned int layoutstats_timer; |
|
module_param(layoutstats_timer, uint, 0644); |
|
EXPORT_SYMBOL_GPL(layoutstats_timer);
|
|
|