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NFSv4.1/pnfs: Allow pNFS device drivers to customise layout segment insertion

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This is needed in order to allow merging of contiguous layout segments,
and also to correct the ordering of layouts for those device drivers that
don't necessarily want to place the read-write layouts first.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
This commit is contained in:
Trond Myklebust 2015-08-25 08:54:17 -04:00
parent 540d9864e1
commit 03772d2f00
2 changed files with 61 additions and 9 deletions
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59
fs/nfs/pnfs.c
View File

@ -1188,16 +1188,41 @@ pnfs_lseg_range_cmp(const struct pnfs_layout_range *l1,
return (int)(l1->iomode == IOMODE_READ) - (int)(l2->iomode == IOMODE_READ);
}
static void
pnfs_layout_insert_lseg(struct pnfs_layout_hdr *lo,
struct pnfs_layout_segment *lseg)
static bool
pnfs_lseg_range_is_after(const struct pnfs_layout_range *l1,
const struct pnfs_layout_range *l2)
{
struct pnfs_layout_segment *lp;
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(lp, &lo->plh_segs, pls_list) {
if (pnfs_lseg_range_cmp(&lseg->pls_range, &lp->pls_range) > 0)
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 "
@ -1219,6 +1244,24 @@ out:
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,
@ -1311,8 +1354,6 @@ pnfs_find_lseg(struct pnfs_layout_hdr *lo,
ret = pnfs_get_lseg(lseg);
break;
}
if (lseg->pls_range.offset > range->offset)
break;
}
dprintk("%s:Return lseg %p ref %d\n",
@ -1637,7 +1678,7 @@ pnfs_layout_process(struct nfs4_layoutget *lgp)
clear_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
pnfs_get_lseg(lseg);
pnfs_layout_insert_lseg(lo, lseg);
pnfs_layout_insert_lseg(lo, lseg, &free_me);
if (res->return_on_close)
set_bit(NFS_LSEG_ROC, &lseg->pls_flags);

11
fs/nfs/pnfs.h
View File

@ -128,6 +128,9 @@ struct pnfs_layoutdriver_type {
struct pnfs_layout_segment * (*alloc_lseg) (struct pnfs_layout_hdr *layoutid, struct nfs4_layoutget_res *lgr, gfp_t gfp_flags);
void (*free_lseg) (struct pnfs_layout_segment *lseg);
void (*add_lseg) (struct pnfs_layout_hdr *layoutid,
struct pnfs_layout_segment *lseg,
struct list_head *free_me);
void (*return_range) (struct pnfs_layout_hdr *lo,
struct pnfs_layout_range *range);
@ -285,6 +288,14 @@ struct pnfs_layout_segment *pnfs_update_layout(struct inode *ino,
gfp_t gfp_flags);
void pnfs_clear_layoutreturn_waitbit(struct pnfs_layout_hdr *lo);
void pnfs_generic_layout_insert_lseg(struct pnfs_layout_hdr *lo,
struct pnfs_layout_segment *lseg,
bool (*is_after)(const struct pnfs_layout_range *lseg_range,
const struct pnfs_layout_range *old),
bool (*do_merge)(struct pnfs_layout_segment *lseg,
struct pnfs_layout_segment *old),
struct list_head *free_me);
void nfs4_deviceid_mark_client_invalid(struct nfs_client *clp);
int pnfs_read_done_resend_to_mds(struct nfs_pgio_header *);
int pnfs_write_done_resend_to_mds(struct nfs_pgio_header *);