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List:       fuse-devel
Subject:    [fuse-devel] about fuse real write data size and write return size problem
From:       atropos <zhouzihao0111 () gmail ! com>
Date:       2019-11-20 11:43:49
Message-ID: CAAvhbuHsCjPkoPF_SHZOoqY=-xigyjVVwK6JTHF8swAmHjnSKg () mail ! gmail ! com
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hi all,

i use libfuse to development a File-Encryption process

and i revise the example passthrough_hp.cc to develop

now=EF=BC=8C the following code is about my confuse

static void sfs_write(fuse_req_t req, fuse_ino_t ino, const char *buf,
                        size_t size, off_t off, struct fuse_file_info *fi)
{
        pwrite(fi->fh, _encode_file_buff, encode_size, encode_off);
        fuse_reply_write(req, (size_t)size);
}

size+off < encode_size + encode_off ,because encrypted data will become
larger

if fuse_reply_write function @param size passing in size =EF=BC=8Creal wirt=
e date
size is size+off

if fuse_reply_write function @param size passing in encode_size=EF=BC=8Crea=
l wirte
date size is encode_size+ encode_off

but i want fuse_reply_write function @param size passing in size=EF=BC=8Cre=
al wirte
date size is encode_size+ encode_off

[Attachment #5 (text/html)]

<div dir="ltr">hi  all,<br><br>i use libfuse to development a File-Encryption \
process<br><br>and i  revise  the example passthrough_hp.cc to develop<br><br>now， \
the following code is about my confuse<br><br>static void sfs_write(fuse_req_t req, \
fuse_ino_t ino, const char *buf,<br>                                    size_t size, \
off_t off, struct fuse_file_info *fi)<br>{<br>            pwrite(fi-&gt;fh, \
_encode_file_buff, encode_size, encode_off);<br>            fuse_reply_write(req, \
(size_t)size);<br>}<br><br>size+off &lt;  encode_size  +  encode_off ,because \
encrypted data will become larger<div><br>if  fuse_reply_write  function @param size \
passing in size ，real wirte date size is size+off  </div><div><br>if \
fuse_reply_write  function @param size passing in encode_size，real wirte date size \
is encode_size+ encode_off</div><div><br>but i want fuse_reply_write  function @param \
size passing in size，real wirte date size is encode_size+ \
encode_off<br></div></div>





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