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| author |   David Howells <dhowells@redhat.com> | 2018-10-20 00:57:57 +0100 |
|---|---|---|
| committer | David Howells <dhowells@redhat.com> | 2018-10-24 00:41:08 +0100 |
| commit | 2a0b4f64c9edcdcb67306f26d9d08ef982cb0ccd (patch) | |
| tree | 41ff1bb90207bd31a39d5490e1304844c90e39a4 /fs | |
| parent | afs: Add a couple of tracepoints to log I/O errors (diff) | |
| download | linux-dev-2a0b4f64c9edcdcb67306f26d9d08ef982cb0ccd.tar.xz linux-dev-2a0b4f64c9edcdcb67306f26d9d08ef982cb0ccd.zip | |
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 <dhowells@redhat.com>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/afs/write.c | 11 |
1 files changed, 11 insertions, 0 deletions
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) |