From: trondmy@kernel.org
To: linux-nfs@vger.kernel.org
Subject: [PATCH v2 05/16] NFS: Don't discard readdir results
Date: Tue, 3 Nov 2020 10:33:18 -0500 [thread overview]
Message-ID: <20201103153329.531942-6-trondmy@kernel.org> (raw)
In-Reply-To: <20201103153329.531942-5-trondmy@kernel.org>
From: Trond Myklebust <trond.myklebust@hammerspace.com>
If a readdir call returns more data than we can fit into one page
cache page, then allocate a new one for that data rather than
discarding the data.
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
---
fs/nfs/dir.c | 46 ++++++++++++++++++++++++++++++++++++++++++----
1 file changed, 42 insertions(+), 4 deletions(-)
diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index b4861a33ad60..788c2a2eeaa3 100644
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -321,6 +321,26 @@ static void nfs_readdir_page_set_eof(struct page *page)
kunmap_atomic(array);
}
+static void nfs_readdir_page_unlock_and_put(struct page *page)
+{
+ unlock_page(page);
+ put_page(page);
+}
+
+static struct page *nfs_readdir_page_get_next(struct address_space *mapping,
+ pgoff_t index, u64 cookie)
+{
+ struct page *page;
+
+ page = nfs_readdir_page_get_locked(mapping, index, cookie);
+ if (page) {
+ if (nfs_readdir_page_last_cookie(page) == cookie)
+ return page;
+ nfs_readdir_page_unlock_and_put(page);
+ }
+ return NULL;
+}
+
static inline
int is_32bit_api(void)
{
@@ -638,13 +658,15 @@ void nfs_prime_dcache(struct dentry *parent, struct nfs_entry *entry,
}
/* Perform conversion from xdr to cache array */
-static
-int nfs_readdir_page_filler(nfs_readdir_descriptor_t *desc, struct nfs_entry *entry,
- struct page **xdr_pages, struct page *page, unsigned int buflen)
+static int nfs_readdir_page_filler(struct nfs_readdir_descriptor *desc,
+ struct nfs_entry *entry,
+ struct page **xdr_pages,
+ struct page *fillme, unsigned int buflen)
{
+ struct address_space *mapping = desc->file->f_mapping;
struct xdr_stream stream;
struct xdr_buf buf;
- struct page *scratch;
+ struct page *scratch, *new, *page = fillme;
int status;
scratch = alloc_page(GFP_KERNEL);
@@ -667,6 +689,19 @@ int nfs_readdir_page_filler(nfs_readdir_descriptor_t *desc, struct nfs_entry *en
desc->dir_verifier);
status = nfs_readdir_add_to_array(entry, page);
+ if (status != -ENOSPC)
+ continue;
+
+ if (page->mapping != mapping)
+ break;
+ new = nfs_readdir_page_get_next(mapping, page->index + 1,
+ entry->prev_cookie);
+ if (!new)
+ break;
+ if (page != fillme)
+ nfs_readdir_page_unlock_and_put(page);
+ page = new;
+ status = nfs_readdir_add_to_array(entry, page);
} while (!status && !entry->eof);
switch (status) {
@@ -682,6 +717,9 @@ int nfs_readdir_page_filler(nfs_readdir_descriptor_t *desc, struct nfs_entry *en
break;
}
+ if (page != fillme)
+ nfs_readdir_page_unlock_and_put(page);
+
put_page(scratch);
return status;
}
--
2.28.0
next prev parent reply other threads:[~2020-11-03 15:43 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-03 15:33 [PATCH v2 00/16] Readdir enhancements trondmy
2020-11-03 15:33 ` [PATCH v2 01/16] NFS: Ensure contents of struct nfs_open_dir_context are consistent trondmy
2020-11-03 15:33 ` [PATCH v2 02/16] NFS: Clean up readdir struct nfs_cache_array trondmy
2020-11-03 15:33 ` [PATCH v2 03/16] NFS: Clean up nfs_readdir_page_filler() trondmy
2020-11-03 15:33 ` [PATCH v2 04/16] NFS: Clean up directory array handling trondmy
2020-11-03 15:33 ` trondmy [this message]
2020-11-03 15:33 ` [PATCH v2 06/16] NFS: Remove unnecessary kmap in nfs_readdir_xdr_to_array() trondmy
2020-11-03 15:33 ` [PATCH v2 07/16] NFS: Replace kmap() with kmap_atomic() in nfs_readdir_search_array() trondmy
2020-11-03 15:33 ` [PATCH v2 08/16] NFS: Simplify struct nfs_cache_array_entry trondmy
2020-11-03 15:33 ` [PATCH v2 09/16] NFS: Support larger readdir buffers trondmy
2020-11-03 15:33 ` [PATCH v2 10/16] NFS: More readdir cleanups trondmy
2020-11-03 15:33 ` [PATCH v2 11/16] NFS: nfs_do_filldir() does not return a value trondmy
2020-11-03 15:33 ` [PATCH v2 12/16] NFS: Reduce readdir stack usage trondmy
2020-11-03 15:33 ` [PATCH v2 13/16] NFS: Cleanup to remove nfs_readdir_descriptor_t typedef trondmy
2020-11-03 15:33 ` [PATCH v2 14/16] NFS: Allow the NFS generic code to pass in a verifier to readdir trondmy
2020-11-03 15:33 ` [PATCH v2 15/16] NFS: Handle NFS4ERR_NOT_SAME and NFSERR_BADCOOKIE from readdir calls trondmy
2020-11-03 15:33 ` [PATCH v2 16/16] NFS: Improve handling of directory verifiers trondmy
2020-11-04 10:12 ` Mkrtchyan, Tigran
2020-11-04 17:21 ` Trond Myklebust
2020-11-03 15:55 ` [PATCH v2 05/16] NFS: Don't discard readdir results Benjamin Coddington
2020-11-03 16:14 ` Trond Myklebust
2020-11-04 16:14 ` [PATCH v2 00/16] Readdir enhancements Benjamin Coddington
2020-11-04 17:04 ` Trond Myklebust
2020-11-04 17:19 ` Benjamin Coddington
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