From 2a0b4f64c9edcdcb67306f26d9d08ef982cb0ccd Mon Sep 17 00:00:00 2001 From: David Howells Date: Sat, 20 Oct 2018 00:57:57 +0100 Subject: afs: Don't invoke the server to read data beyond EOF 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 --- fs/afs/write.c | 11 +++++++++++ 1 file changed, 11 insertions(+) (limited to 'fs/afs') 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) -- cgit v1.2.3-59-g8ed1b