diff options
author | Chuck Lever <chuck.lever@oracle.com> | 2020-11-13 17:03:49 -0500 |
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committer | Chuck Lever <chuck.lever@oracle.com> | 2021-01-25 09:36:25 -0500 |
commit | 788cd46ecf83ee2d561cb4e754e276dc8089b787 (patch) | |
tree | d024f7c3ec27fb9d8c8d0a43f0613cfc8d475dcb /fs/nfsd/nfsproc.c | |
parent | 1fcbd1c9456ba129d38420e345e91c4b6363db47 (diff) | |
download | linux-788cd46ecf83ee2d561cb4e754e276dc8089b787.tar.gz |
NFSD: Add helper to set up the pages where the dirlist is encoded
Add a helper similar to nfsd3_init_dirlist_pages().
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Diffstat (limited to 'fs/nfsd/nfsproc.c')
-rw-r--r-- | fs/nfsd/nfsproc.c | 29 |
1 files changed, 18 insertions, 11 deletions
diff --git a/fs/nfsd/nfsproc.c b/fs/nfsd/nfsproc.c index bdb47848f7fd..b2f8035f166b 100644 --- a/fs/nfsd/nfsproc.c +++ b/fs/nfsd/nfsproc.c @@ -553,6 +553,20 @@ nfsd_proc_rmdir(struct svc_rqst *rqstp) return rpc_success; } +static void nfsd_init_dirlist_pages(struct svc_rqst *rqstp, + struct nfsd_readdirres *resp, + int count) +{ + count = min_t(u32, count, PAGE_SIZE); + + /* Convert byte count to number of words (i.e. >> 2), + * and reserve room for the NULL ptr & eof flag (-2 words) */ + resp->buflen = (count >> 2) - 2; + + resp->buffer = page_address(*rqstp->rq_next_page); + rqstp->rq_next_page++; +} + /* * Read a portion of a directory. */ @@ -561,31 +575,24 @@ nfsd_proc_readdir(struct svc_rqst *rqstp) { struct nfsd_readdirargs *argp = rqstp->rq_argp; struct nfsd_readdirres *resp = rqstp->rq_resp; - int count; loff_t offset; + __be32 *buffer; dprintk("nfsd: READDIR %s %d bytes at %d\n", SVCFH_fmt(&argp->fh), argp->count, argp->cookie); - /* Shrink to the client read size */ - count = (argp->count >> 2) - 2; - - /* Make sure we've room for the NULL ptr & eof flag */ - count -= 2; - if (count < 0) - count = 0; + nfsd_init_dirlist_pages(rqstp, resp, argp->count); + buffer = resp->buffer; - resp->buffer = argp->buffer; resp->offset = NULL; - resp->buflen = count; resp->common.err = nfs_ok; /* Read directory and encode entries on the fly */ offset = argp->cookie; resp->status = nfsd_readdir(rqstp, &argp->fh, &offset, &resp->common, nfssvc_encode_entry); - resp->count = resp->buffer - argp->buffer; + resp->count = resp->buffer - buffer; if (resp->offset) *resp->offset = htonl(offset); |