From: David Howells <dhowells@redhat.com>
To: viro@zeniv.linux.org.uk
Cc: dhowells@redhat.com, linux-afs@lists.infradead.org,
linux-kernel@vger.kernel.org
Subject: [PATCH 11/24] afs: Don't invoke the server to read data beyond EOF
Date: Sat, 20 Oct 2018 02:11:57 +0100 [thread overview]
Message-ID: <153999791749.866.7965988630811562818.stgit@warthog.procyon.org.uk> (raw)
In-Reply-To: <153999783767.866.7957078562330181644.stgit@warthog.procyon.org.uk>
When writing a new page, clear space in the page rather than attempting to
load it from the server if the space is beyond the EOF.
Signed-off-by: David Howells <dhowells@redhat.com>
---
fs/afs/write.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/fs/afs/write.c b/fs/afs/write.c
index fdb9d6024126..11066a3248ba 100644
--- a/fs/afs/write.c
+++ b/fs/afs/write.c
@@ -33,10 +33,21 @@ static int afs_fill_page(struct afs_vnode *vnode, struct key *key,
loff_t pos, unsigned int len, struct page *page)
{
struct afs_read *req;
+ size_t p;
+ void *data;
int ret;
_enter(",,%llu", (unsigned long long)pos);
+ if (pos >= vnode->vfs_inode.i_size) {
+ p = pos & ~PAGE_MASK;
+ ASSERTCMP(p + len, <=, PAGE_SIZE);
+ data = kmap(page);
+ memset(data + p, 0, len);
+ kunmap(page);
+ return 0;
+ }
+
req = kzalloc(sizeof(struct afs_read) + sizeof(struct page *),
GFP_KERNEL);
if (!req)
next prev parent reply other threads:[~2018-10-20 1:12 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-20 1:10 [PATCH 00/24] AFS development David Howells
2018-10-20 1:10 ` [PATCH 01/24] iov_iter: Separate type from direction and use accessor functions David Howells
2018-10-20 4:56 ` Al Viro
2018-10-22 13:00 ` David Howells
2018-10-20 1:10 ` [PATCH 02/24] iov_iter: Renumber the ITER_* constants in uio.h David Howells
2018-10-20 4:59 ` Al Viro
2018-10-22 15:54 ` David Howells
2018-10-23 13:20 ` David Howells
2018-10-20 1:10 ` [PATCH 03/24] iov_iter: Add I/O discard iterator David Howells
2018-10-20 5:05 ` Al Viro
2018-10-22 16:18 ` David Howells
2018-10-20 1:11 ` [PATCH 04/24] afs: Better tracing of protocol errors David Howells
2018-10-20 1:11 ` [PATCH 05/24] afs: Set up the iov_iter before calling afs_extract_data() David Howells
2018-10-20 1:11 ` [PATCH 06/24] afs: Improve FS server rotation error handling David Howells
2018-10-20 1:11 ` [PATCH 07/24] afs: Implement VL server rotation David Howells
2018-10-20 1:11 ` [PATCH 08/24] afs: Fix TTL on VL server and address lists David Howells
2018-10-20 1:11 ` [PATCH 09/24] afs: Handle EIO from delivery function David Howells
2018-10-20 1:11 ` [PATCH 10/24] afs: Add a couple of tracepoints to log I/O errors David Howells
2018-10-20 1:11 ` David Howells [this message]
2018-10-20 1:12 ` [PATCH 12/24] afs: Increase to 64-bit volume ID and 96-bit vnode ID for YFS David Howells
2018-10-20 1:12 ` [PATCH 13/24] afs: Commit the status on a new file/dir/symlink David Howells
2018-10-20 1:12 ` [PATCH 14/24] afs: Remove callback details from afs_callback_break struct David Howells
2018-10-20 1:12 ` [PATCH 15/24] afs: Implement the YFS cache manager service David Howells
2018-10-20 1:12 ` [PATCH 16/24] afs: Fix FS.FetchStatus delivery from updating wrong vnode David Howells
2018-10-20 1:12 ` [PATCH 17/24] afs: Calc callback expiry in op reply delivery David Howells
2018-10-20 1:12 ` [PATCH 18/24] afs: Get the target vnode in afs_rmdir() and get a callback on it David Howells
2018-10-20 1:12 ` [PATCH 19/24] afs: Expand data structure fields to support YFS David Howells
2018-10-20 1:13 ` [PATCH 20/24] afs: Implement YFS support in the fs client David Howells
2018-10-20 1:13 ` [PATCH 21/24] afs: Allow dumping of server cursor on operation failure David Howells
2018-10-20 1:13 ` [PATCH 22/24] afs: Eliminate the address pointer from the address list cursor David Howells
2018-10-20 1:13 ` [PATCH 23/24] afs: Fix callback handling David Howells
2018-10-20 1:13 ` [PATCH 24/24] afs: Probe multiple fileservers simultaneously David Howells
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