| Message ID | 20220111191608.88762-45-jlayton@kernel.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | ceph+fscrypt: full support | expand |
On 1/12/22 3:16 AM, Jeff Layton wrote: > Note that the crypto block may be smaller than a page, but the reverse > cannot be true. > > Signed-off-by: Jeff Layton <jlayton@kernel.org> > --- > fs/ceph/file.c | 94 ++++++++++++++++++++++++++++++++++++-------------- > 1 file changed, 69 insertions(+), 25 deletions(-) > > diff --git a/fs/ceph/file.c b/fs/ceph/file.c > index 41766b2012e9..b4f2fcd33837 100644 > --- a/fs/ceph/file.c > +++ b/fs/ceph/file.c > @@ -926,9 +926,17 @@ ssize_t __ceph_sync_read(struct inode *inode, loff_t *ki_pos, > bool more; > int idx; > size_t left; > + u64 read_off = off; > + u64 read_len = len; > + > + /* determine new offset/length if encrypted */ > + fscrypt_adjust_off_and_len(inode, &read_off, &read_len); > + > + dout("sync_read orig %llu~%llu reading %llu~%llu", > + off, len, read_off, read_len); > > req = ceph_osdc_new_request(osdc, &ci->i_layout, > - ci->i_vino, off, &len, 0, 1, > + ci->i_vino, read_off, &read_len, 0, 1, > CEPH_OSD_OP_READ, CEPH_OSD_FLAG_READ, > NULL, ci->i_truncate_seq, > ci->i_truncate_size, false); > @@ -937,10 +945,13 @@ ssize_t __ceph_sync_read(struct inode *inode, loff_t *ki_pos, > break; > } > > + /* adjust len downward if the request truncated the len */ > + if (off + len > read_off + read_len) > + len = read_off + read_len - off; > more = len < iov_iter_count(to); > > - num_pages = calc_pages_for(off, len); > - page_off = off & ~PAGE_MASK; > + num_pages = calc_pages_for(read_off, read_len); > + page_off = offset_in_page(off); > pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL); > if (IS_ERR(pages)) { > ceph_osdc_put_request(req); > @@ -948,7 +959,8 @@ ssize_t __ceph_sync_read(struct inode *inode, loff_t *ki_pos, > break; > } > > - osd_req_op_extent_osd_data_pages(req, 0, pages, len, page_off, > + osd_req_op_extent_osd_data_pages(req, 0, pages, read_len, > + offset_in_page(read_off), > false, false); > ret = ceph_osdc_start_request(osdc, req, false); > if (!ret) > @@ -957,23 +969,50 @@ ssize_t __ceph_sync_read(struct inode *inode, loff_t *ki_pos, > ceph_update_read_metrics(&fsc->mdsc->metric, > req->r_start_latency, > req->r_end_latency, > - len, ret); > + read_len, ret); > > if (ret > 0) > objver = req->r_version; > ceph_osdc_put_request(req); > - > i_size = i_size_read(inode); > dout("sync_read %llu~%llu got %zd i_size %llu%s\n", > off, len, ret, i_size, (more ? " MORE" : "")); > > - if (ret == -ENOENT) > + if (ret == -ENOENT) { > + /* No object? Then this is a hole */ > ret = 0; > + } else if (ret > 0 && IS_ENCRYPTED(inode)) { > + int fret; > + > + fret = ceph_fscrypt_decrypt_pages(inode, pages, read_off, ret); > + if (fret < 0) { > + ceph_release_page_vector(pages, num_pages); > + ret = fret; > + break; > + } > + > + dout("sync_read decrypted fret %d\n", fret); > + > + /* account for any partial block at the beginning */ > + fret -= (off - read_off); > + > + /* > + * Short read after big offset adjustment? > + * Nothing is usable, just call it a zero > + * len read. > + */ > + fret = max(fret, 0); > + > + /* account for partial block at the end */ > + ret = min_t(ssize_t, fret, len); > + } > + > + /* Short read but not EOF? Zero out the remainder. */ > if (ret >= 0 && ret < len && (off + ret < i_size)) { > int zlen = min(len - ret, i_size - off - ret); > int zoff = page_off + ret; > dout("sync_read zero gap %llu~%llu\n", > - off + ret, off + ret + zlen); > + off + ret, off + ret + zlen); > ceph_zero_page_vector_range(zoff, zlen, pages); > ret += zlen; > } > @@ -981,15 +1020,15 @@ ssize_t __ceph_sync_read(struct inode *inode, loff_t *ki_pos, > idx = 0; > left = ret > 0 ? ret : 0; > while (left > 0) { > - size_t len, copied; > - page_off = off & ~PAGE_MASK; > - len = min_t(size_t, left, PAGE_SIZE - page_off); > + size_t plen, copied; > + plen = min_t(size_t, left, PAGE_SIZE - page_off); > SetPageUptodate(pages[idx]); > copied = copy_page_to_iter(pages[idx++], > - page_off, len, to); > + page_off, plen, to); > off += copied; > left -= copied; > - if (copied < len) { > + page_off = 0; > + if (copied < plen) { > ret = -EFAULT; > break; > } > @@ -1006,20 +1045,21 @@ ssize_t __ceph_sync_read(struct inode *inode, loff_t *ki_pos, > break; > } > > - if (off > *ki_pos) { > - if (off >= i_size) { > - *retry_op = CHECK_EOF; > - ret = i_size - *ki_pos; > - *ki_pos = i_size; > - } else { > - ret = off - *ki_pos; > - *ki_pos = off; > + if (ret > 0) { > + if (off > *ki_pos) { > + if (off >= i_size) { > + *retry_op = CHECK_EOF; > + ret = i_size - *ki_pos; > + *ki_pos = i_size; > + } else { > + ret = off - *ki_pos; > + *ki_pos = off; > + } > } > - } > - > - if (last_objver && ret > 0) > - *last_objver = objver; > > + if (last_objver) > + *last_objver = objver; > + } > dout("sync_read result %zd retry_op %d\n", ret, *retry_op); > return ret; > } > @@ -1532,6 +1572,9 @@ ceph_sync_write(struct kiocb *iocb, struct iov_iter *from, loff_t pos, > last = (pos + len) != (write_pos + write_len); > rmw = first || last; > > + dout("sync_write ino %llx %lld~%llu adjusted %lld~%llu -- %srmw\n", > + ci->i_vino.ino, pos, len, write_pos, write_len, rmw ? "" : "no "); > + Should this move to the previous patch ? > /* > * The data is emplaced into the page as it would be if it were in > * an array of pagecache pages. > @@ -1761,6 +1804,7 @@ ceph_sync_write(struct kiocb *iocb, struct iov_iter *from, loff_t pos, > ceph_clear_error_write(ci); > pos += len; > written += len; > + dout("sync_write written %d\n", written); > if (pos > i_size_read(inode)) { > check_caps = ceph_inode_set_size(inode, pos); > if (check_caps)
On Wed, 2022-01-19 at 13:18 +0800, Xiubo Li wrote: > On 1/12/22 3:16 AM, Jeff Layton wrote: > > Note that the crypto block may be smaller than a page, but the reverse > > cannot be true. > > > > Signed-off-by: Jeff Layton <jlayton@kernel.org> > > --- > > fs/ceph/file.c | 94 ++++++++++++++++++++++++++++++++++++-------------- > > 1 file changed, 69 insertions(+), 25 deletions(-) > > > > diff --git a/fs/ceph/file.c b/fs/ceph/file.c > > index 41766b2012e9..b4f2fcd33837 100644 > > --- a/fs/ceph/file.c > > +++ b/fs/ceph/file.c > > @@ -926,9 +926,17 @@ ssize_t __ceph_sync_read(struct inode *inode, loff_t *ki_pos, > > bool more; > > int idx; > > size_t left; > > + u64 read_off = off; > > + u64 read_len = len; > > + > > + /* determine new offset/length if encrypted */ > > + fscrypt_adjust_off_and_len(inode, &read_off, &read_len); > > + > > + dout("sync_read orig %llu~%llu reading %llu~%llu", > > + off, len, read_off, read_len); > > > > req = ceph_osdc_new_request(osdc, &ci->i_layout, > > - ci->i_vino, off, &len, 0, 1, > > + ci->i_vino, read_off, &read_len, 0, 1, > > CEPH_OSD_OP_READ, CEPH_OSD_FLAG_READ, > > NULL, ci->i_truncate_seq, > > ci->i_truncate_size, false); > > @@ -937,10 +945,13 @@ ssize_t __ceph_sync_read(struct inode *inode, loff_t *ki_pos, > > break; > > } > > > > + /* adjust len downward if the request truncated the len */ > > + if (off + len > read_off + read_len) > > + len = read_off + read_len - off; > > more = len < iov_iter_count(to); > > > > - num_pages = calc_pages_for(off, len); > > - page_off = off & ~PAGE_MASK; > > + num_pages = calc_pages_for(read_off, read_len); > > + page_off = offset_in_page(off); > > pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL); > > if (IS_ERR(pages)) { > > ceph_osdc_put_request(req); > > @@ -948,7 +959,8 @@ ssize_t __ceph_sync_read(struct inode *inode, loff_t *ki_pos, > > break; > > } > > > > - osd_req_op_extent_osd_data_pages(req, 0, pages, len, page_off, > > + osd_req_op_extent_osd_data_pages(req, 0, pages, read_len, > > + offset_in_page(read_off), > > false, false); > > ret = ceph_osdc_start_request(osdc, req, false); > > if (!ret) > > @@ -957,23 +969,50 @@ ssize_t __ceph_sync_read(struct inode *inode, loff_t *ki_pos, > > ceph_update_read_metrics(&fsc->mdsc->metric, > > req->r_start_latency, > > req->r_end_latency, > > - len, ret); > > + read_len, ret); > > > > if (ret > 0) > > objver = req->r_version; > > ceph_osdc_put_request(req); > > - > > i_size = i_size_read(inode); > > dout("sync_read %llu~%llu got %zd i_size %llu%s\n", > > off, len, ret, i_size, (more ? " MORE" : "")); > > > > - if (ret == -ENOENT) > > + if (ret == -ENOENT) { > > + /* No object? Then this is a hole */ > > ret = 0; > > + } else if (ret > 0 && IS_ENCRYPTED(inode)) { > > + int fret; > > + > > + fret = ceph_fscrypt_decrypt_pages(inode, pages, read_off, ret); > > + if (fret < 0) { > > + ceph_release_page_vector(pages, num_pages); > > + ret = fret; > > + break; > > + } > > + > > + dout("sync_read decrypted fret %d\n", fret); > > + > > + /* account for any partial block at the beginning */ > > + fret -= (off - read_off); > > + > > + /* > > + * Short read after big offset adjustment? > > + * Nothing is usable, just call it a zero > > + * len read. > > + */ > > + fret = max(fret, 0); > > + > > + /* account for partial block at the end */ > > + ret = min_t(ssize_t, fret, len); > > + } > > + > > + /* Short read but not EOF? Zero out the remainder. */ > > if (ret >= 0 && ret < len && (off + ret < i_size)) { > > int zlen = min(len - ret, i_size - off - ret); > > int zoff = page_off + ret; > > dout("sync_read zero gap %llu~%llu\n", > > - off + ret, off + ret + zlen); > > + off + ret, off + ret + zlen); > > ceph_zero_page_vector_range(zoff, zlen, pages); > > ret += zlen; > > } > > @@ -981,15 +1020,15 @@ ssize_t __ceph_sync_read(struct inode *inode, loff_t *ki_pos, > > idx = 0; > > left = ret > 0 ? ret : 0; > > while (left > 0) { > > - size_t len, copied; > > - page_off = off & ~PAGE_MASK; > > - len = min_t(size_t, left, PAGE_SIZE - page_off); > > + size_t plen, copied; > > + plen = min_t(size_t, left, PAGE_SIZE - page_off); > > SetPageUptodate(pages[idx]); > > copied = copy_page_to_iter(pages[idx++], > > - page_off, len, to); > > + page_off, plen, to); > > off += copied; > > left -= copied; > > - if (copied < len) { > > + page_off = 0; > > + if (copied < plen) { > > ret = -EFAULT; > > break; > > } > > @@ -1006,20 +1045,21 @@ ssize_t __ceph_sync_read(struct inode *inode, loff_t *ki_pos, > > break; > > } > > > > - if (off > *ki_pos) { > > - if (off >= i_size) { > > - *retry_op = CHECK_EOF; > > - ret = i_size - *ki_pos; > > - *ki_pos = i_size; > > - } else { > > - ret = off - *ki_pos; > > - *ki_pos = off; > > + if (ret > 0) { > > + if (off > *ki_pos) { > > + if (off >= i_size) { > > + *retry_op = CHECK_EOF; > > + ret = i_size - *ki_pos; > > + *ki_pos = i_size; > > + } else { > > + ret = off - *ki_pos; > > + *ki_pos = off; > > + } > > } > > - } > > - > > - if (last_objver && ret > 0) > > - *last_objver = objver; > > > > + if (last_objver) > > + *last_objver = objver; > > + } > > dout("sync_read result %zd retry_op %d\n", ret, *retry_op); > > return ret; > > } > > @@ -1532,6 +1572,9 @@ ceph_sync_write(struct kiocb *iocb, struct iov_iter *from, loff_t pos, > > last = (pos + len) != (write_pos + write_len); > > rmw = first || last; > > > > + dout("sync_write ino %llx %lld~%llu adjusted %lld~%llu -- %srmw\n", > > + ci->i_vino.ino, pos, len, write_pos, write_len, rmw ? "" : "no "); > > + > > Should this move to the previous patch ? > > Yes, fixed in wip-fscrypt. Thanks! > > /* > > * The data is emplaced into the page as it would be if it were in > > * an array of pagecache pages. > > @@ -1761,6 +1804,7 @@ ceph_sync_write(struct kiocb *iocb, struct iov_iter *from, loff_t pos, > > ceph_clear_error_write(ci); > > pos += len; > > written += len; > > + dout("sync_write written %d\n", written); > > if (pos > i_size_read(inode)) { > > check_caps = ceph_inode_set_size(inode, pos); > > if (check_caps) >
diff --git a/fs/ceph/file.c b/fs/ceph/file.c index 41766b2012e9..b4f2fcd33837 100644 --- a/fs/ceph/file.c +++ b/fs/ceph/file.c @@ -926,9 +926,17 @@ ssize_t __ceph_sync_read(struct inode *inode, loff_t *ki_pos, bool more; int idx; size_t left; + u64 read_off = off; + u64 read_len = len; + + /* determine new offset/length if encrypted */ + fscrypt_adjust_off_and_len(inode, &read_off, &read_len); + + dout("sync_read orig %llu~%llu reading %llu~%llu", + off, len, read_off, read_len); req = ceph_osdc_new_request(osdc, &ci->i_layout, - ci->i_vino, off, &len, 0, 1, + ci->i_vino, read_off, &read_len, 0, 1, CEPH_OSD_OP_READ, CEPH_OSD_FLAG_READ, NULL, ci->i_truncate_seq, ci->i_truncate_size, false); @@ -937,10 +945,13 @@ ssize_t __ceph_sync_read(struct inode *inode, loff_t *ki_pos, break; } + /* adjust len downward if the request truncated the len */ + if (off + len > read_off + read_len) + len = read_off + read_len - off; more = len < iov_iter_count(to); - num_pages = calc_pages_for(off, len); - page_off = off & ~PAGE_MASK; + num_pages = calc_pages_for(read_off, read_len); + page_off = offset_in_page(off); pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL); if (IS_ERR(pages)) { ceph_osdc_put_request(req); @@ -948,7 +959,8 @@ ssize_t __ceph_sync_read(struct inode *inode, loff_t *ki_pos, break; } - osd_req_op_extent_osd_data_pages(req, 0, pages, len, page_off, + osd_req_op_extent_osd_data_pages(req, 0, pages, read_len, + offset_in_page(read_off), false, false); ret = ceph_osdc_start_request(osdc, req, false); if (!ret) @@ -957,23 +969,50 @@ ssize_t __ceph_sync_read(struct inode *inode, loff_t *ki_pos, ceph_update_read_metrics(&fsc->mdsc->metric, req->r_start_latency, req->r_end_latency, - len, ret); + read_len, ret); if (ret > 0) objver = req->r_version; ceph_osdc_put_request(req); - i_size = i_size_read(inode); dout("sync_read %llu~%llu got %zd i_size %llu%s\n", off, len, ret, i_size, (more ? " MORE" : "")); - if (ret == -ENOENT) + if (ret == -ENOENT) { + /* No object? Then this is a hole */ ret = 0; + } else if (ret > 0 && IS_ENCRYPTED(inode)) { + int fret; + + fret = ceph_fscrypt_decrypt_pages(inode, pages, read_off, ret); + if (fret < 0) { + ceph_release_page_vector(pages, num_pages); + ret = fret; + break; + } + + dout("sync_read decrypted fret %d\n", fret); + + /* account for any partial block at the beginning */ + fret -= (off - read_off); + + /* + * Short read after big offset adjustment? + * Nothing is usable, just call it a zero + * len read. + */ + fret = max(fret, 0); + + /* account for partial block at the end */ + ret = min_t(ssize_t, fret, len); + } + + /* Short read but not EOF? Zero out the remainder. */ if (ret >= 0 && ret < len && (off + ret < i_size)) { int zlen = min(len - ret, i_size - off - ret); int zoff = page_off + ret; dout("sync_read zero gap %llu~%llu\n", - off + ret, off + ret + zlen); + off + ret, off + ret + zlen); ceph_zero_page_vector_range(zoff, zlen, pages); ret += zlen; } @@ -981,15 +1020,15 @@ ssize_t __ceph_sync_read(struct inode *inode, loff_t *ki_pos, idx = 0; left = ret > 0 ? ret : 0; while (left > 0) { - size_t len, copied; - page_off = off & ~PAGE_MASK; - len = min_t(size_t, left, PAGE_SIZE - page_off); + size_t plen, copied; + plen = min_t(size_t, left, PAGE_SIZE - page_off); SetPageUptodate(pages[idx]); copied = copy_page_to_iter(pages[idx++], - page_off, len, to); + page_off, plen, to); off += copied; left -= copied; - if (copied < len) { + page_off = 0; + if (copied < plen) { ret = -EFAULT; break; } @@ -1006,20 +1045,21 @@ ssize_t __ceph_sync_read(struct inode *inode, loff_t *ki_pos, break; } - if (off > *ki_pos) { - if (off >= i_size) { - *retry_op = CHECK_EOF; - ret = i_size - *ki_pos; - *ki_pos = i_size; - } else { - ret = off - *ki_pos; - *ki_pos = off; + if (ret > 0) { + if (off > *ki_pos) { + if (off >= i_size) { + *retry_op = CHECK_EOF; + ret = i_size - *ki_pos; + *ki_pos = i_size; + } else { + ret = off - *ki_pos; + *ki_pos = off; + } } - } - - if (last_objver && ret > 0) - *last_objver = objver; + if (last_objver) + *last_objver = objver; + } dout("sync_read result %zd retry_op %d\n", ret, *retry_op); return ret; } @@ -1532,6 +1572,9 @@ ceph_sync_write(struct kiocb *iocb, struct iov_iter *from, loff_t pos, last = (pos + len) != (write_pos + write_len); rmw = first || last; + dout("sync_write ino %llx %lld~%llu adjusted %lld~%llu -- %srmw\n", + ci->i_vino.ino, pos, len, write_pos, write_len, rmw ? "" : "no "); + /* * The data is emplaced into the page as it would be if it were in * an array of pagecache pages. @@ -1761,6 +1804,7 @@ ceph_sync_write(struct kiocb *iocb, struct iov_iter *from, loff_t pos, ceph_clear_error_write(ci); pos += len; written += len; + dout("sync_write written %d\n", written); if (pos > i_size_read(inode)) { check_caps = ceph_inode_set_size(inode, pos); if (check_caps)
Note that the crypto block may be smaller than a page, but the reverse cannot be true. Signed-off-by: Jeff Layton <jlayton@kernel.org> --- fs/ceph/file.c | 94 ++++++++++++++++++++++++++++++++++++-------------- 1 file changed, 69 insertions(+), 25 deletions(-)