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-rw-r--r--fs/ceph/addr.c69
-rw-r--r--fs/ceph/file.c90
2 files changed, 125 insertions, 34 deletions
diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c
index 89ca27848325..95ff84930dcf 100644
--- a/fs/ceph/addr.c
+++ b/fs/ceph/addr.c
@@ -18,6 +18,7 @@
#include "mds_client.h"
#include "cache.h"
#include "metric.h"
+#include "crypto.h"
#include <linux/ceph/osd_client.h>
#include <linux/ceph/striper.h>
@@ -242,7 +243,8 @@ static bool ceph_netfs_clamp_length(struct netfs_io_subrequest *subreq)
static void finish_netfs_read(struct ceph_osd_request *req)
{
- struct ceph_fs_client *fsc = ceph_inode_to_client(req->r_inode);
+ struct inode *inode = req->r_inode;
+ struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
struct ceph_osd_data *osd_data = osd_req_op_extent_osd_data(req, 0);
struct netfs_io_subrequest *subreq = req->r_priv;
struct ceph_osd_req_op *op = &req->r_ops[0];
@@ -256,16 +258,31 @@ static void finish_netfs_read(struct ceph_osd_request *req)
subreq->len, i_size_read(req->r_inode));
/* no object means success but no data */
- if (sparse && err >= 0)
- err = ceph_sparse_ext_map_end(op);
- else if (err == -ENOENT)
+ if (err == -ENOENT)
err = 0;
else if (err == -EBLOCKLISTED)
fsc->blocklisted = true;
- if (err >= 0 && err < subreq->len)
- __set_bit(NETFS_SREQ_CLEAR_TAIL, &subreq->flags);
+ if (err >= 0) {
+ if (sparse && err > 0)
+ err = ceph_sparse_ext_map_end(op);
+ if (err < subreq->len)
+ __set_bit(NETFS_SREQ_CLEAR_TAIL, &subreq->flags);
+ if (IS_ENCRYPTED(inode) && err > 0) {
+ err = ceph_fscrypt_decrypt_extents(inode,
+ osd_data->pages, subreq->start,
+ op->extent.sparse_ext,
+ op->extent.sparse_ext_cnt);
+ if (err > subreq->len)
+ err = subreq->len;
+ }
+ }
+ if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGES) {
+ ceph_put_page_vector(osd_data->pages,
+ calc_pages_for(osd_data->alignment,
+ osd_data->length), false);
+ }
netfs_subreq_terminated(subreq, err, false);
iput(req->r_inode);
}
@@ -336,7 +353,8 @@ static void ceph_netfs_issue_read(struct netfs_io_subrequest *subreq)
struct iov_iter iter;
int err = 0;
u64 len = subreq->len;
- bool sparse = ceph_test_mount_opt(fsc, SPARSEREAD);
+ bool sparse = IS_ENCRYPTED(inode) || ceph_test_mount_opt(fsc, SPARSEREAD);
+ u64 off = subreq->start;
if (ceph_inode_is_shutdown(inode)) {
err = -EIO;
@@ -346,8 +364,10 @@ static void ceph_netfs_issue_read(struct netfs_io_subrequest *subreq)
if (ceph_has_inline_data(ci) && ceph_netfs_issue_op_inline(subreq))
return;
- req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, vino, subreq->start, &len,
- 0, 1, sparse ? CEPH_OSD_OP_SPARSE_READ : CEPH_OSD_OP_READ,
+ ceph_fscrypt_adjust_off_and_len(inode, &off, &len);
+
+ req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, vino,
+ off, &len, 0, 1, sparse ? CEPH_OSD_OP_SPARSE_READ : CEPH_OSD_OP_READ,
CEPH_OSD_FLAG_READ | fsc->client->osdc.client->options->read_from_replica,
NULL, ci->i_truncate_seq, ci->i_truncate_size, false);
if (IS_ERR(req)) {
@@ -363,8 +383,37 @@ static void ceph_netfs_issue_read(struct netfs_io_subrequest *subreq)
}
dout("%s: pos=%llu orig_len=%zu len=%llu\n", __func__, subreq->start, subreq->len, len);
+
iov_iter_xarray(&iter, ITER_DEST, &rreq->mapping->i_pages, subreq->start, len);
- osd_req_op_extent_osd_iter(req, 0, &iter);
+
+ /*
+ * FIXME: For now, use CEPH_OSD_DATA_TYPE_PAGES instead of _ITER for
+ * encrypted inodes. We'd need infrastructure that handles an iov_iter
+ * instead of page arrays, and we don't have that as of yet. Once the
+ * dust settles on the write helpers and encrypt/decrypt routines for
+ * netfs, we should be able to rework this.
+ */
+ if (IS_ENCRYPTED(inode)) {
+ struct page **pages;
+ size_t page_off;
+
+ err = iov_iter_get_pages_alloc2(&iter, &pages, len, &page_off);
+ if (err < 0) {
+ dout("%s: iov_ter_get_pages_alloc returned %d\n",
+ __func__, err);
+ goto out;
+ }
+
+ /* should always give us a page-aligned read */
+ WARN_ON_ONCE(page_off);
+ len = err;
+ err = 0;
+
+ osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0, false,
+ false);
+ } else {
+ osd_req_op_extent_osd_iter(req, 0, &iter);
+ }
req->r_callback = finish_netfs_read;
req->r_priv = subreq;
req->r_inode = inode;
diff --git a/fs/ceph/file.c b/fs/ceph/file.c
index 45e00e42960b..9d1a77cdc494 100644
--- a/fs/ceph/file.c
+++ b/fs/ceph/file.c
@@ -970,7 +970,7 @@ ssize_t __ceph_sync_read(struct inode *inode, loff_t *ki_pos,
u64 off = *ki_pos;
u64 len = iov_iter_count(to);
u64 i_size = i_size_read(inode);
- bool sparse = ceph_test_mount_opt(fsc, SPARSEREAD);
+ bool sparse = IS_ENCRYPTED(inode) || ceph_test_mount_opt(fsc, SPARSEREAD);
u64 objver = 0;
dout("sync_read on inode %p %llx~%llx\n", inode, *ki_pos, len);
@@ -1001,10 +1001,19 @@ ssize_t __ceph_sync_read(struct inode *inode, loff_t *ki_pos,
int idx;
size_t left;
struct ceph_osd_req_op *op;
+ u64 read_off = off;
+ u64 read_len = len;
+
+ /* determine new offset/length if encrypted */
+ ceph_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,
- sparse ? CEPH_OSD_OP_SPARSE_READ : CEPH_OSD_OP_READ,
+ ci->i_vino, read_off, &read_len, 0, 1,
+ sparse ? CEPH_OSD_OP_SPARSE_READ :
+ CEPH_OSD_OP_READ,
CEPH_OSD_FLAG_READ,
NULL, ci->i_truncate_seq,
ci->i_truncate_size, false);
@@ -1013,10 +1022,13 @@ 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);
@@ -1024,7 +1036,8 @@ 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);
op = &req->r_ops[0];
@@ -1042,7 +1055,7 @@ 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;
@@ -1057,8 +1070,35 @@ ssize_t __ceph_sync_read(struct inode *inode, loff_t *ki_pos,
else if (ret == -ENOENT)
ret = 0;
+ if (ret > 0 && IS_ENCRYPTED(inode)) {
+ int fret;
+
+ fret = ceph_fscrypt_decrypt_extents(inode, pages,
+ read_off, op->extent.sparse_ext,
+ op->extent.sparse_ext_cnt);
+ if (fret < 0) {
+ ret = fret;
+ ceph_osdc_put_request(req);
+ break;
+ }
+
+ /* 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);
+ }
+
ceph_osdc_put_request(req);
+ /* 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;
@@ -1072,15 +1112,16 @@ 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;
}
@@ -1097,20 +1138,21 @@ 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;
}
generated by cgit v1.2.3 (git 2.39.0) at 2024-10-03 09:38:48 +0300