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fuse: Prepare to handle short reads 

A helper which gets called when read reports less bytes than was requested.
See patch "trust kernel i_size only" for details.

Signed-off-by: Maxim Patlasov <MPatlasov@parallels.com>
Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
This commit is contained in:
Pavel Emelyanov 2013-10-10 17:10:16 +04:00 committed by Miklos Szeredi
parent 650b22b941
commit a92adc824e
1 changed files with 13 additions and 8 deletions
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21
fs/fuse/file.c
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@ -671,6 +671,15 @@ static void fuse_read_update_size(struct inode *inode, loff_t size,
spin_unlock(&fc->lock);
}
static void fuse_short_read(struct fuse_req *req, struct inode *inode,
u64 attr_ver)
{
size_t num_read = req->out.args[0].size;
loff_t pos = page_offset(req->pages[0]) + num_read;
fuse_read_update_size(inode, pos, attr_ver);
}
static int fuse_readpage(struct file *file, struct page *page)
{
struct fuse_io_priv io = { .async = 0, .file = file };
@ -708,18 +717,18 @@ static int fuse_readpage(struct file *file, struct page *page)
req->page_descs[0].length = count;
num_read = fuse_send_read(req, &io, pos, count, NULL);
err = req->out.h.error;
fuse_put_request(fc, req);
if (!err) {
/*
* Short read means EOF. If file size is larger, truncate it
*/
if (num_read < count)
fuse_read_update_size(inode, pos + num_read, attr_ver);
fuse_short_read(req, inode, attr_ver);
SetPageUptodate(page);
}
fuse_put_request(fc, req);
fuse_invalidate_atime(inode);
out:
unlock_page(page);
@ -742,13 +751,9 @@ static void fuse_readpages_end(struct fuse_conn *fc, struct fuse_req *req)
/*
* Short read means EOF. If file size is larger, truncate it
*/
if (!req->out.h.error && num_read < count) {
loff_t pos;
if (!req->out.h.error && num_read < count)
fuse_short_read(req, inode, req->misc.read.attr_ver);
pos = page_offset(req->pages[0]) + num_read;
fuse_read_update_size(inode, pos,
req->misc.read.attr_ver);
}
fuse_invalidate_atime(inode);
}