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NFS: Don't overfill uncached readdir pages 

If we're doing an uncached read of the directory, then we ideally want
to read only the exact set of entries that will fit in the buffer
supplied by the getdents() system call. So unlike the case where we're
reading into the page cache, let's send only one READDIR call, before
trying to fill up the buffer.

Fixes: 35df59d3ef ("NFS: Reduce number of RPC calls when doing uncached readdir")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
trondmy@kernel.org 2022-01-18 19:25:42 -05:00 committed by Anna Schumaker
parent 26291c54e1
commit d9c4e39c1f
1 changed files with 2 additions and 1 deletions
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3
fs/nfs/dir.c
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@ -867,7 +867,8 @@ static int nfs_readdir_xdr_to_array(struct nfs_readdir_descriptor *desc,
status = nfs_readdir_page_filler(desc, entry, pages, pglen,
arrays, narrays);
} while (!status && nfs_readdir_page_needs_filling(page));
} while (!status && nfs_readdir_page_needs_filling(page) &&
page_mapping(page));
nfs_readdir_free_pages(pages, array_size);
out: