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| author |   Trond Myklebust <trond.myklebust@hammerspace.com> | 2018-09-03 13:12:15 -0400 |
|---|---|---|
| committer | Trond Myklebust <trond.myklebust@hammerspace.com> | 2018-09-30 15:35:16 -0400 |
| commit | 28ced9a84cd2f9fc68a081fb3b34e70c5d459be3 (patch) | |
| tree | 2fce92ffd58bdf780ba75c51838f95f38cfe6f00 | |
| parent | pNFS: Don't zero out the array in nfs4_alloc_pages() (diff) | |
| download | linux-dev-28ced9a84cd2f9fc68a081fb3b34e70c5d459be3.tar.xz linux-dev-28ced9a84cd2f9fc68a081fb3b34e70c5d459be3.zip | |
pNFS: Don't allocate more pages than we need to fit a layoutget response
For the 'files' and 'flexfiles' layout types, we do not expect the reply
to be any larger than 4k. The block and scsi layout types are a little more
greedy, so we keep allocating the maximum response size for now.
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
| -rw-r--r-- | fs/nfs/filelayout/filelayout.c | 1 | ||||
| -rw-r--r-- | fs/nfs/flexfilelayout/flexfilelayout.c | 1 | ||||
| -rw-r--r-- | fs/nfs/pnfs.c | 7 | ||||
| -rw-r--r-- | fs/nfs/pnfs.h | 1 |
4 files changed, 10 insertions, 0 deletions
diff --git a/fs/nfs/filelayout/filelayout.c b/fs/nfs/filelayout/filelayout.c index d175724ff566..61f46facb39c 100644 --- a/fs/nfs/filelayout/filelayout.c +++ b/fs/nfs/filelayout/filelayout.c @@ -1164,6 +1164,7 @@ static struct pnfs_layoutdriver_type filelayout_type = { .id = LAYOUT_NFSV4_1_FILES, .name = "LAYOUT_NFSV4_1_FILES", .owner = THIS_MODULE, + .max_layoutget_response = 4096, /* 1 page or so... */ .alloc_layout_hdr = filelayout_alloc_layout_hdr, .free_layout_hdr = filelayout_free_layout_hdr, .alloc_lseg = filelayout_alloc_lseg, diff --git a/fs/nfs/flexfilelayout/flexfilelayout.c b/fs/nfs/flexfilelayout/flexfilelayout.c index cae43333ef16..86bcba40ca61 100644 --- a/fs/nfs/flexfilelayout/flexfilelayout.c +++ b/fs/nfs/flexfilelayout/flexfilelayout.c @@ -2356,6 +2356,7 @@ static struct pnfs_layoutdriver_type flexfilelayout_type = { .name = "LAYOUT_FLEX_FILES", .owner = THIS_MODULE, .flags = PNFS_LAYOUTGET_ON_OPEN, + .max_layoutget_response = 4096, /* 1 page or so... */ .set_layoutdriver = ff_layout_set_layoutdriver, .alloc_layout_hdr = ff_layout_alloc_layout_hdr, .free_layout_hdr = ff_layout_free_layout_hdr, diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c index 6b5b2d36f502..c5672c02afd6 100644 --- a/fs/nfs/pnfs.c +++ b/fs/nfs/pnfs.c @@ -991,6 +991,7 @@ pnfs_alloc_init_layoutget_args(struct inode *ino, 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; @@ -1000,6 +1001,12 @@ pnfs_alloc_init_layoutget_args(struct inode *ino, 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); diff --git a/fs/nfs/pnfs.h b/fs/nfs/pnfs.h index ece367ebde69..e2e9fcd5341d 100644 --- a/fs/nfs/pnfs.h +++ b/fs/nfs/pnfs.h @@ -125,6 +125,7 @@ struct pnfs_layoutdriver_type { struct module *owner; unsigned flags; unsigned max_deviceinfo_size; + unsigned max_layoutget_response; int (*set_layoutdriver) (struct nfs_server *, const struct nfs_fh *); int (*clear_layoutdriver) (struct nfs_server *); |