diff options
| author | Pavel Emelyanov <xemul@openvz.org> | 2013-10-10 17:10:16 +0400 |
|---|---|---|
| committer | Alex Shi <alex.shi@linaro.org> | 2015-04-20 13:24:40 +0800 |
| commit | fb2667e92663bb09a3d7e79de4103b7ce296b589 (patch) | |
| tree | 158b80425ab065e7f0a2b707ca854488bb796157 /fs/fuse/file.c | |
| parent | 4a40d2a3f50fd5721e3c8896e077d3f62f5b73be (diff) | |
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>
(cherry picked from commit a92adc824ed5feaa2d4f7029f21170f574987aee)
Signed-off-by: Alex Shi <alex.shi@linaro.org>
Diffstat (limited to 'fs/fuse/file.c')
| -rw-r--r-- | fs/fuse/file.c | 21 |
1 files changed, 13 insertions, 8 deletions
diff --git a/fs/fuse/file.c b/fs/fuse/file.c index f0183869252f..4646157eb98c 100644 --- a/fs/fuse/file.c +++ b/fs/fuse/file.c @@ -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); } |