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ceph: support copy_file_range file operation
This commit implements support for the copy_file_range syscall in cephfs. It is implemented using the RADOS 'copy-from' operation, which allows to do a remote object copy, without the need to download/upload data from/to the OSDs. Some manual copy may however be required if the source/destination file offsets aren't object aligned or if the copy length is smaller than the object size. Signed-off-by: Luis Henriques <lhenriques@suse.com> Reviewed-by: "Yan, Zheng" <zyan@redhat.com> Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Luis Henriques
Ilya Dryomov
parent
23ddf9bea9
commit
503f82a993
294
fs/ceph/file.c
294
fs/ceph/file.c
@ -1,5 +1,6 @@
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// SPDX-License-Identifier: GPL-2.0
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#include <linux/ceph/ceph_debug.h>
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#include <linux/ceph/striper.h>
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#include <linux/module.h>
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#include <linux/sched.h>
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@ -1795,6 +1796,297 @@ static long ceph_fallocate(struct file *file, int mode,
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return ret;
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}
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/*
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* This function tries to get FILE_WR capabilities for dst_ci and FILE_RD for
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* src_ci. Two attempts are made to obtain both caps, and an error is return if
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* this fails; zero is returned on success.
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*/
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static int get_rd_wr_caps(struct ceph_inode_info *src_ci,
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loff_t src_endoff, int *src_got,
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struct ceph_inode_info *dst_ci,
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loff_t dst_endoff, int *dst_got)
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{
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int ret = 0;
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bool retrying = false;
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retry_caps:
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ret = ceph_get_caps(dst_ci, CEPH_CAP_FILE_WR, CEPH_CAP_FILE_BUFFER,
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dst_endoff, dst_got, NULL);
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if (ret < 0)
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return ret;
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/*
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* Since we're already holding the FILE_WR capability for the dst file,
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* we would risk a deadlock by using ceph_get_caps. Thus, we'll do some
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* retry dance instead to try to get both capabilities.
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*/
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ret = ceph_try_get_caps(src_ci, CEPH_CAP_FILE_RD, CEPH_CAP_FILE_SHARED,
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false, src_got);
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if (ret <= 0) {
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/* Start by dropping dst_ci caps and getting src_ci caps */
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ceph_put_cap_refs(dst_ci, *dst_got);
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if (retrying) {
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if (!ret)
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/* ceph_try_get_caps masks EAGAIN */
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ret = -EAGAIN;
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return ret;
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}
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ret = ceph_get_caps(src_ci, CEPH_CAP_FILE_RD,
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CEPH_CAP_FILE_SHARED, src_endoff,
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src_got, NULL);
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if (ret < 0)
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return ret;
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/*... drop src_ci caps too, and retry */
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ceph_put_cap_refs(src_ci, *src_got);
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retrying = true;
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goto retry_caps;
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}
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return ret;
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}
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static void put_rd_wr_caps(struct ceph_inode_info *src_ci, int src_got,
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struct ceph_inode_info *dst_ci, int dst_got)
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{
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ceph_put_cap_refs(src_ci, src_got);
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ceph_put_cap_refs(dst_ci, dst_got);
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}
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/*
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* This function does several size-related checks, returning an error if:
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* - source file is smaller than off+len
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* - destination file size is not OK (inode_newsize_ok())
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* - max bytes quotas is exceeded
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*/
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static int is_file_size_ok(struct inode *src_inode, struct inode *dst_inode,
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loff_t src_off, loff_t dst_off, size_t len)
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{
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loff_t size, endoff;
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size = i_size_read(src_inode);
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/*
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* Don't copy beyond source file EOF. Instead of simply setting length
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* to (size - src_off), just drop to VFS default implementation, as the
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* local i_size may be stale due to other clients writing to the source
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* inode.
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*/
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if (src_off + len > size) {
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dout("Copy beyond EOF (%llu + %zu > %llu)\n",
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src_off, len, size);
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return -EOPNOTSUPP;
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}
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size = i_size_read(dst_inode);
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endoff = dst_off + len;
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if (inode_newsize_ok(dst_inode, endoff))
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return -EOPNOTSUPP;
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if (ceph_quota_is_max_bytes_exceeded(dst_inode, endoff))
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return -EDQUOT;
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return 0;
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}
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static ssize_t ceph_copy_file_range(struct file *src_file, loff_t src_off,
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struct file *dst_file, loff_t dst_off,
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size_t len, unsigned int flags)
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{
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struct inode *src_inode = file_inode(src_file);
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struct inode *dst_inode = file_inode(dst_file);
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struct ceph_inode_info *src_ci = ceph_inode(src_inode);
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struct ceph_inode_info *dst_ci = ceph_inode(dst_inode);
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struct ceph_cap_flush *prealloc_cf;
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struct ceph_object_locator src_oloc, dst_oloc;
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struct ceph_object_id src_oid, dst_oid;
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loff_t endoff = 0, size;
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ssize_t ret = -EIO;
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u64 src_objnum, dst_objnum, src_objoff, dst_objoff;
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u32 src_objlen, dst_objlen, object_size;
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int src_got = 0, dst_got = 0, err, dirty;
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bool do_final_copy = false;
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if (src_inode == dst_inode)
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return -EINVAL;
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if (ceph_snap(dst_inode) != CEPH_NOSNAP)
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return -EROFS;
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/*
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* Some of the checks below will return -EOPNOTSUPP, which will force a
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* fallback to the default VFS copy_file_range implementation. This is
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* desirable in several cases (for ex, the 'len' is smaller than the
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* size of the objects, or in cases where that would be more
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* efficient).
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*/
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if ((src_ci->i_layout.stripe_unit != dst_ci->i_layout.stripe_unit) ||
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(src_ci->i_layout.stripe_count != dst_ci->i_layout.stripe_count) ||
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(src_ci->i_layout.object_size != dst_ci->i_layout.object_size))
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return -EOPNOTSUPP;
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if (len < src_ci->i_layout.object_size)
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return -EOPNOTSUPP; /* no remote copy will be done */
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prealloc_cf = ceph_alloc_cap_flush();
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if (!prealloc_cf)
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return -ENOMEM;
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/* Start by sync'ing the source file */
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ret = file_write_and_wait_range(src_file, src_off, (src_off + len));
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if (ret < 0)
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goto out;
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/*
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* We need FILE_WR caps for dst_ci and FILE_RD for src_ci as other
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* clients may have dirty data in their caches. And OSDs know nothing
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* about caps, so they can't safely do the remote object copies.
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*/
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err = get_rd_wr_caps(src_ci, (src_off + len), &src_got,
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dst_ci, (dst_off + len), &dst_got);
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if (err < 0) {
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dout("get_rd_wr_caps returned %d\n", err);
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ret = -EOPNOTSUPP;
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goto out;
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}
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ret = is_file_size_ok(src_inode, dst_inode, src_off, dst_off, len);
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if (ret < 0)
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goto out_caps;
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size = i_size_read(dst_inode);
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endoff = dst_off + len;
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/* Drop dst file cached pages */
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ret = invalidate_inode_pages2_range(dst_inode->i_mapping,
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dst_off >> PAGE_SHIFT,
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endoff >> PAGE_SHIFT);
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if (ret < 0) {
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dout("Failed to invalidate inode pages (%zd)\n", ret);
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ret = 0; /* XXX */
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}
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src_oloc.pool = src_ci->i_layout.pool_id;
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src_oloc.pool_ns = ceph_try_get_string(src_ci->i_layout.pool_ns);
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dst_oloc.pool = dst_ci->i_layout.pool_id;
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dst_oloc.pool_ns = ceph_try_get_string(dst_ci->i_layout.pool_ns);
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ceph_calc_file_object_mapping(&src_ci->i_layout, src_off,
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src_ci->i_layout.object_size,
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&src_objnum, &src_objoff, &src_objlen);
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ceph_calc_file_object_mapping(&dst_ci->i_layout, dst_off,
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dst_ci->i_layout.object_size,
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&dst_objnum, &dst_objoff, &dst_objlen);
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/* object-level offsets need to the same */
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if (src_objoff != dst_objoff) {
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ret = -EOPNOTSUPP;
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goto out_caps;
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}
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/*
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* Do a manual copy if the object offset isn't object aligned.
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* 'src_objlen' contains the bytes left until the end of the object,
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* starting at the src_off
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*/
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if (src_objoff) {
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/*
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* we need to temporarily drop all caps as we'll be calling
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* {read,write}_iter, which will get caps again.
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*/
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put_rd_wr_caps(src_ci, src_got, dst_ci, dst_got);
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ret = do_splice_direct(src_file, &src_off, dst_file,
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&dst_off, src_objlen, flags);
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if (ret < 0) {
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dout("do_splice_direct returned %d\n", err);
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goto out;
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}
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len -= ret;
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err = get_rd_wr_caps(src_ci, (src_off + len),
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&src_got, dst_ci,
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(dst_off + len), &dst_got);
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if (err < 0)
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goto out;
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err = is_file_size_ok(src_inode, dst_inode,
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src_off, dst_off, len);
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if (err < 0)
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goto out_caps;
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}
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object_size = src_ci->i_layout.object_size;
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while (len >= object_size) {
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ceph_calc_file_object_mapping(&src_ci->i_layout, src_off,
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object_size, &src_objnum,
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&src_objoff, &src_objlen);
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ceph_calc_file_object_mapping(&dst_ci->i_layout, dst_off,
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object_size, &dst_objnum,
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&dst_objoff, &dst_objlen);
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ceph_oid_init(&src_oid);
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ceph_oid_printf(&src_oid, "%llx.%08llx",
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src_ci->i_vino.ino, src_objnum);
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ceph_oid_init(&dst_oid);
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ceph_oid_printf(&dst_oid, "%llx.%08llx",
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dst_ci->i_vino.ino, dst_objnum);
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/* Do an object remote copy */
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err = ceph_osdc_copy_from(
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&ceph_inode_to_client(src_inode)->client->osdc,
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src_ci->i_vino.snap, 0,
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&src_oid, &src_oloc,
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CEPH_OSD_OP_FLAG_FADVISE_SEQUENTIAL |
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CEPH_OSD_OP_FLAG_FADVISE_NOCACHE,
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&dst_oid, &dst_oloc,
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CEPH_OSD_OP_FLAG_FADVISE_SEQUENTIAL |
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CEPH_OSD_OP_FLAG_FADVISE_DONTNEED, 0);
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if (err) {
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dout("ceph_osdc_copy_from returned %d\n", err);
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if (!ret)
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ret = err;
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goto out_caps;
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}
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len -= object_size;
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src_off += object_size;
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dst_off += object_size;
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ret += object_size;
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}
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if (len)
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/* We still need one final local copy */
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do_final_copy = true;
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file_update_time(dst_file);
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if (endoff > size) {
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int caps_flags = 0;
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/* Let the MDS know about dst file size change */
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if (ceph_quota_is_max_bytes_approaching(dst_inode, endoff))
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caps_flags |= CHECK_CAPS_NODELAY;
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if (ceph_inode_set_size(dst_inode, endoff))
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caps_flags |= CHECK_CAPS_AUTHONLY;
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if (caps_flags)
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ceph_check_caps(dst_ci, caps_flags, NULL);
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}
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/* Mark Fw dirty */
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spin_lock(&dst_ci->i_ceph_lock);
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dst_ci->i_inline_version = CEPH_INLINE_NONE;
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dirty = __ceph_mark_dirty_caps(dst_ci, CEPH_CAP_FILE_WR, &prealloc_cf);
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spin_unlock(&dst_ci->i_ceph_lock);
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if (dirty)
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__mark_inode_dirty(dst_inode, dirty);
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out_caps:
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put_rd_wr_caps(src_ci, src_got, dst_ci, dst_got);
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if (do_final_copy) {
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err = do_splice_direct(src_file, &src_off, dst_file,
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&dst_off, len, flags);
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if (err < 0) {
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dout("do_splice_direct returned %d\n", err);
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goto out;
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}
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len -= err;
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ret += err;
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}
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out:
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ceph_free_cap_flush(prealloc_cf);
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return ret;
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}
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const struct file_operations ceph_file_fops = {
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.open = ceph_open,
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.release = ceph_release,
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@ -1810,5 +2102,5 @@ const struct file_operations ceph_file_fops = {
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.unlocked_ioctl = ceph_ioctl,
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.compat_ioctl = ceph_ioctl,
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.fallocate = ceph_fallocate,
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.copy_file_range = ceph_copy_file_range,
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};
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