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pNFS/flexfiles: Check the layout segment range before doing I/O 

When starting to read or write with a layout segment, check that the
range matches our request.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
This commit is contained in:
Trond Myklebust 2020-03-23 14:48:23 -04:00
parent 660d1eb223
commit e1e54ab710
3 changed files with 13 additions and 3 deletions
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12
fs/nfs/flexfilelayout/flexfilelayout.c
View File

@ -830,6 +830,14 @@ ff_layout_pg_get_read(struct nfs_pageio_descriptor *pgio,
}
}
static void
ff_layout_pg_check_layout(struct nfs_pageio_descriptor *pgio,
struct nfs_page *req)
{
pnfs_generic_pg_check_layout(pgio);
pnfs_generic_pg_check_range(pgio, req);
}
static void
ff_layout_pg_init_read(struct nfs_pageio_descriptor *pgio,
struct nfs_page *req)
@ -840,7 +848,7 @@ ff_layout_pg_init_read(struct nfs_pageio_descriptor *pgio,
int ds_idx;
retry:
pnfs_generic_pg_check_layout(pgio);
ff_layout_pg_check_layout(pgio, req);
/* Use full layout for now */
if (!pgio->pg_lseg) {
ff_layout_pg_get_read(pgio, req, false);
@ -900,7 +908,7 @@ ff_layout_pg_init_write(struct nfs_pageio_descriptor *pgio,
int i;
retry:
pnfs_generic_pg_check_layout(pgio);
ff_layout_pg_check_layout(pgio, req);
if (!pgio->pg_lseg) {
pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode,
nfs_req_openctx(req),

3
fs/nfs/pnfs.c
View File

@ -2611,7 +2611,7 @@ EXPORT_SYMBOL_GPL(pnfs_generic_pg_check_layout);
* Check for any intersection between the request and the pgio->pg_lseg,
* and if none, put this pgio->pg_lseg away.
*/
static void
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)) {
@ -2619,6 +2619,7 @@ pnfs_generic_pg_check_range(struct nfs_pageio_descriptor *pgio, struct nfs_page
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)

1
fs/nfs/pnfs.h
View File

@ -252,6 +252,7 @@ void pnfs_put_lseg(struct pnfs_layout_segment *lseg);
void set_pnfs_layoutdriver(struct nfs_server *, const struct nfs_fh *, struct nfs_fsinfo *);
void unset_pnfs_layoutdriver(struct nfs_server *);
void pnfs_generic_pg_check_layout(struct nfs_pageio_descriptor *pgio);
void pnfs_generic_pg_check_range(struct nfs_pageio_descriptor *pgio, struct nfs_page *req);
void pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *, struct nfs_page *);
int pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc);
void pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio,