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![Jeff Layton](/assets/img/avatar_default.png)
Testing with the fscache overhaul has triggered some lockdep warnings about circular lock dependencies involving page_mkwrite and the mmap_lock. It'd be better to do the "real work" without the mmap lock being held. Change the skip_checking_caps parameter in __ceph_put_cap_refs to an enum, and use that to determine whether to queue check_caps, do it synchronously or not at all. Change ceph_page_mkwrite to do a ceph_put_cap_refs_async(). Signed-off-by: Jeff Layton <jlayton@kernel.org> Reviewed-by: Ilya Dryomov <idryomov@gmail.com> Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2127 lines
55 KiB
C
2127 lines
55 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/ceph/ceph_debug.h>
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#include <linux/backing-dev.h>
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#include <linux/fs.h>
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#include <linux/mm.h>
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#include <linux/pagemap.h>
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#include <linux/writeback.h> /* generic_writepages */
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#include <linux/slab.h>
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#include <linux/pagevec.h>
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#include <linux/task_io_accounting_ops.h>
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#include <linux/signal.h>
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#include <linux/iversion.h>
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#include <linux/ktime.h>
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#include "super.h"
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#include "mds_client.h"
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#include "cache.h"
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#include "metric.h"
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#include <linux/ceph/osd_client.h>
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#include <linux/ceph/striper.h>
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/*
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* Ceph address space ops.
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*
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* There are a few funny things going on here.
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*
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* The page->private field is used to reference a struct
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* ceph_snap_context for _every_ dirty page. This indicates which
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* snapshot the page was logically dirtied in, and thus which snap
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* context needs to be associated with the osd write during writeback.
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*
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* Similarly, struct ceph_inode_info maintains a set of counters to
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* count dirty pages on the inode. In the absence of snapshots,
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* i_wrbuffer_ref == i_wrbuffer_ref_head == the dirty page count.
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*
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* When a snapshot is taken (that is, when the client receives
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* notification that a snapshot was taken), each inode with caps and
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* with dirty pages (dirty pages implies there is a cap) gets a new
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* ceph_cap_snap in the i_cap_snaps list (which is sorted in ascending
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* order, new snaps go to the tail). The i_wrbuffer_ref_head count is
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* moved to capsnap->dirty. (Unless a sync write is currently in
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* progress. In that case, the capsnap is said to be "pending", new
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* writes cannot start, and the capsnap isn't "finalized" until the
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* write completes (or fails) and a final size/mtime for the inode for
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* that snap can be settled upon.) i_wrbuffer_ref_head is reset to 0.
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*
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* On writeback, we must submit writes to the osd IN SNAP ORDER. So,
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* we look for the first capsnap in i_cap_snaps and write out pages in
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* that snap context _only_. Then we move on to the next capsnap,
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* eventually reaching the "live" or "head" context (i.e., pages that
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* are not yet snapped) and are writing the most recently dirtied
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* pages.
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*
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* Invalidate and so forth must take care to ensure the dirty page
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* accounting is preserved.
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*/
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#define CONGESTION_ON_THRESH(congestion_kb) (congestion_kb >> (PAGE_SHIFT-10))
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#define CONGESTION_OFF_THRESH(congestion_kb) \
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(CONGESTION_ON_THRESH(congestion_kb) - \
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(CONGESTION_ON_THRESH(congestion_kb) >> 2))
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static inline struct ceph_snap_context *page_snap_context(struct page *page)
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{
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if (PagePrivate(page))
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return (void *)page->private;
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return NULL;
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}
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/*
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* Dirty a page. Optimistically adjust accounting, on the assumption
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* that we won't race with invalidate. If we do, readjust.
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*/
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static int ceph_set_page_dirty(struct page *page)
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{
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struct address_space *mapping = page->mapping;
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struct inode *inode;
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struct ceph_inode_info *ci;
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struct ceph_snap_context *snapc;
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int ret;
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if (unlikely(!mapping))
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return !TestSetPageDirty(page);
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if (PageDirty(page)) {
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dout("%p set_page_dirty %p idx %lu -- already dirty\n",
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mapping->host, page, page->index);
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BUG_ON(!PagePrivate(page));
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return 0;
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}
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inode = mapping->host;
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ci = ceph_inode(inode);
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/* dirty the head */
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spin_lock(&ci->i_ceph_lock);
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BUG_ON(ci->i_wr_ref == 0); // caller should hold Fw reference
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if (__ceph_have_pending_cap_snap(ci)) {
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struct ceph_cap_snap *capsnap =
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list_last_entry(&ci->i_cap_snaps,
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struct ceph_cap_snap,
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ci_item);
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snapc = ceph_get_snap_context(capsnap->context);
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capsnap->dirty_pages++;
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} else {
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BUG_ON(!ci->i_head_snapc);
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snapc = ceph_get_snap_context(ci->i_head_snapc);
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++ci->i_wrbuffer_ref_head;
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}
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if (ci->i_wrbuffer_ref == 0)
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ihold(inode);
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++ci->i_wrbuffer_ref;
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dout("%p set_page_dirty %p idx %lu head %d/%d -> %d/%d "
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"snapc %p seq %lld (%d snaps)\n",
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mapping->host, page, page->index,
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ci->i_wrbuffer_ref-1, ci->i_wrbuffer_ref_head-1,
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ci->i_wrbuffer_ref, ci->i_wrbuffer_ref_head,
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snapc, snapc->seq, snapc->num_snaps);
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spin_unlock(&ci->i_ceph_lock);
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/*
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* Reference snap context in page->private. Also set
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* PagePrivate so that we get invalidatepage callback.
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*/
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BUG_ON(PagePrivate(page));
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page->private = (unsigned long)snapc;
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SetPagePrivate(page);
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ret = __set_page_dirty_nobuffers(page);
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WARN_ON(!PageLocked(page));
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WARN_ON(!page->mapping);
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return ret;
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}
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/*
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* If we are truncating the full page (i.e. offset == 0), adjust the
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* dirty page counters appropriately. Only called if there is private
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* data on the page.
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*/
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static void ceph_invalidatepage(struct page *page, unsigned int offset,
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unsigned int length)
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{
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struct inode *inode;
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struct ceph_inode_info *ci;
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struct ceph_snap_context *snapc = page_snap_context(page);
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inode = page->mapping->host;
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ci = ceph_inode(inode);
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if (offset != 0 || length != PAGE_SIZE) {
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dout("%p invalidatepage %p idx %lu partial dirty page %u~%u\n",
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inode, page, page->index, offset, length);
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return;
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}
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ceph_invalidate_fscache_page(inode, page);
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WARN_ON(!PageLocked(page));
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if (!PagePrivate(page))
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return;
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dout("%p invalidatepage %p idx %lu full dirty page\n",
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inode, page, page->index);
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ceph_put_wrbuffer_cap_refs(ci, 1, snapc);
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ceph_put_snap_context(snapc);
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page->private = 0;
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ClearPagePrivate(page);
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}
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static int ceph_releasepage(struct page *page, gfp_t g)
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{
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dout("%p releasepage %p idx %lu (%sdirty)\n", page->mapping->host,
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page, page->index, PageDirty(page) ? "" : "not ");
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/* Can we release the page from the cache? */
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if (!ceph_release_fscache_page(page, g))
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return 0;
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return !PagePrivate(page);
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}
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/* read a single page, without unlocking it. */
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static int ceph_do_readpage(struct file *filp, struct page *page)
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{
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struct inode *inode = file_inode(filp);
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struct ceph_inode_info *ci = ceph_inode(inode);
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struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
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struct ceph_osd_client *osdc = &fsc->client->osdc;
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struct ceph_osd_request *req;
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struct ceph_vino vino = ceph_vino(inode);
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int err = 0;
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u64 off = page_offset(page);
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u64 len = PAGE_SIZE;
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if (off >= i_size_read(inode)) {
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zero_user_segment(page, 0, PAGE_SIZE);
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SetPageUptodate(page);
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return 0;
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}
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if (ci->i_inline_version != CEPH_INLINE_NONE) {
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/*
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* Uptodate inline data should have been added
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* into page cache while getting Fcr caps.
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*/
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if (off == 0)
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return -EINVAL;
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zero_user_segment(page, 0, PAGE_SIZE);
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SetPageUptodate(page);
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return 0;
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}
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err = ceph_readpage_from_fscache(inode, page);
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if (err == 0)
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return -EINPROGRESS;
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dout("readpage ino %llx.%llx file %p off %llu len %llu page %p index %lu\n",
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vino.ino, vino.snap, filp, off, len, page, page->index);
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req = ceph_osdc_new_request(osdc, &ci->i_layout, vino, off, &len, 0, 1,
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CEPH_OSD_OP_READ, CEPH_OSD_FLAG_READ, NULL,
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ci->i_truncate_seq, ci->i_truncate_size,
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false);
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if (IS_ERR(req))
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return PTR_ERR(req);
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osd_req_op_extent_osd_data_pages(req, 0, &page, len, 0, false, false);
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err = ceph_osdc_start_request(osdc, req, false);
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if (!err)
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err = ceph_osdc_wait_request(osdc, req);
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ceph_update_read_latency(&fsc->mdsc->metric, req->r_start_latency,
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req->r_end_latency, err);
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ceph_osdc_put_request(req);
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dout("readpage result %d\n", err);
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if (err == -ENOENT)
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err = 0;
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if (err < 0) {
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ceph_fscache_readpage_cancel(inode, page);
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if (err == -EBLOCKLISTED)
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fsc->blocklisted = true;
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goto out;
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}
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if (err < PAGE_SIZE)
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/* zero fill remainder of page */
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zero_user_segment(page, err, PAGE_SIZE);
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else
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flush_dcache_page(page);
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SetPageUptodate(page);
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ceph_readpage_to_fscache(inode, page);
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out:
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return err < 0 ? err : 0;
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}
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static int ceph_readpage(struct file *filp, struct page *page)
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{
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int r = ceph_do_readpage(filp, page);
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if (r != -EINPROGRESS)
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unlock_page(page);
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else
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r = 0;
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return r;
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}
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/*
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* Finish an async read(ahead) op.
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*/
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static void finish_read(struct ceph_osd_request *req)
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{
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struct inode *inode = req->r_inode;
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struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
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struct ceph_osd_data *osd_data;
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int rc = req->r_result <= 0 ? req->r_result : 0;
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int bytes = req->r_result >= 0 ? req->r_result : 0;
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int num_pages;
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int i;
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dout("finish_read %p req %p rc %d bytes %d\n", inode, req, rc, bytes);
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if (rc == -EBLOCKLISTED)
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ceph_inode_to_client(inode)->blocklisted = true;
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/* unlock all pages, zeroing any data we didn't read */
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osd_data = osd_req_op_extent_osd_data(req, 0);
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BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGES);
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num_pages = calc_pages_for((u64)osd_data->alignment,
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(u64)osd_data->length);
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for (i = 0; i < num_pages; i++) {
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struct page *page = osd_data->pages[i];
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if (rc < 0 && rc != -ENOENT) {
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ceph_fscache_readpage_cancel(inode, page);
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goto unlock;
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}
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if (bytes < (int)PAGE_SIZE) {
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/* zero (remainder of) page */
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int s = bytes < 0 ? 0 : bytes;
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zero_user_segment(page, s, PAGE_SIZE);
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}
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dout("finish_read %p uptodate %p idx %lu\n", inode, page,
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page->index);
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flush_dcache_page(page);
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SetPageUptodate(page);
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ceph_readpage_to_fscache(inode, page);
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unlock:
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unlock_page(page);
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put_page(page);
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bytes -= PAGE_SIZE;
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}
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ceph_update_read_latency(&fsc->mdsc->metric, req->r_start_latency,
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req->r_end_latency, rc);
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kfree(osd_data->pages);
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}
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/*
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* start an async read(ahead) operation. return nr_pages we submitted
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* a read for on success, or negative error code.
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*/
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static int start_read(struct inode *inode, struct ceph_rw_context *rw_ctx,
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struct list_head *page_list, int max)
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{
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struct ceph_osd_client *osdc =
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&ceph_inode_to_client(inode)->client->osdc;
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struct ceph_inode_info *ci = ceph_inode(inode);
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struct page *page = lru_to_page(page_list);
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struct ceph_vino vino;
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struct ceph_osd_request *req;
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u64 off;
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u64 len;
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int i;
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struct page **pages;
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pgoff_t next_index;
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int nr_pages = 0;
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int got = 0;
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int ret = 0;
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if (!rw_ctx) {
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/* caller of readpages does not hold buffer and read caps
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* (fadvise, madvise and readahead cases) */
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int want = CEPH_CAP_FILE_CACHE;
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ret = ceph_try_get_caps(inode, CEPH_CAP_FILE_RD, want,
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true, &got);
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if (ret < 0) {
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dout("start_read %p, error getting cap\n", inode);
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} else if (!(got & want)) {
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dout("start_read %p, no cache cap\n", inode);
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ret = 0;
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}
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if (ret <= 0) {
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if (got)
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ceph_put_cap_refs(ci, got);
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while (!list_empty(page_list)) {
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page = lru_to_page(page_list);
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list_del(&page->lru);
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put_page(page);
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}
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return ret;
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}
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}
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off = (u64) page_offset(page);
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/* count pages */
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next_index = page->index;
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list_for_each_entry_reverse(page, page_list, lru) {
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if (page->index != next_index)
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break;
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nr_pages++;
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next_index++;
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if (max && nr_pages == max)
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break;
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}
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len = nr_pages << PAGE_SHIFT;
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dout("start_read %p nr_pages %d is %lld~%lld\n", inode, nr_pages,
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off, len);
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vino = ceph_vino(inode);
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req = ceph_osdc_new_request(osdc, &ci->i_layout, vino, off, &len,
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0, 1, CEPH_OSD_OP_READ,
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CEPH_OSD_FLAG_READ, NULL,
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ci->i_truncate_seq, ci->i_truncate_size,
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false);
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if (IS_ERR(req)) {
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ret = PTR_ERR(req);
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goto out;
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}
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|
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/* build page vector */
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nr_pages = calc_pages_for(0, len);
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pages = kmalloc_array(nr_pages, sizeof(*pages), GFP_KERNEL);
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if (!pages) {
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ret = -ENOMEM;
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goto out_put;
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}
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for (i = 0; i < nr_pages; ++i) {
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page = list_entry(page_list->prev, struct page, lru);
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BUG_ON(PageLocked(page));
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list_del(&page->lru);
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dout("start_read %p adding %p idx %lu\n", inode, page,
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page->index);
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if (add_to_page_cache_lru(page, &inode->i_data, page->index,
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GFP_KERNEL)) {
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ceph_fscache_uncache_page(inode, page);
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put_page(page);
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dout("start_read %p add_to_page_cache failed %p\n",
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inode, page);
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nr_pages = i;
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if (nr_pages > 0) {
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len = nr_pages << PAGE_SHIFT;
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osd_req_op_extent_update(req, 0, len);
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break;
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}
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goto out_pages;
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}
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pages[i] = page;
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}
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osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0, false, false);
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req->r_callback = finish_read;
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req->r_inode = inode;
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|
|
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dout("start_read %p starting %p %lld~%lld\n", inode, req, off, len);
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ret = ceph_osdc_start_request(osdc, req, false);
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if (ret < 0)
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goto out_pages;
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ceph_osdc_put_request(req);
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|
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/* After adding locked pages to page cache, the inode holds cache cap.
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* So we can drop our cap refs. */
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if (got)
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ceph_put_cap_refs(ci, got);
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return nr_pages;
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out_pages:
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for (i = 0; i < nr_pages; ++i) {
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ceph_fscache_readpage_cancel(inode, pages[i]);
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unlock_page(pages[i]);
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}
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ceph_put_page_vector(pages, nr_pages, false);
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out_put:
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ceph_osdc_put_request(req);
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out:
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if (got)
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ceph_put_cap_refs(ci, got);
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return ret;
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}
|
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|
|
|
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/*
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* Read multiple pages. Leave pages we don't read + unlock in page_list;
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* the caller (VM) cleans them up.
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*/
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static int ceph_readpages(struct file *file, struct address_space *mapping,
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struct list_head *page_list, unsigned nr_pages)
|
|
{
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struct inode *inode = file_inode(file);
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struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
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struct ceph_file_info *fi = file->private_data;
|
|
struct ceph_rw_context *rw_ctx;
|
|
int rc = 0;
|
|
int max = 0;
|
|
|
|
if (ceph_inode(inode)->i_inline_version != CEPH_INLINE_NONE)
|
|
return -EINVAL;
|
|
|
|
rc = ceph_readpages_from_fscache(mapping->host, mapping, page_list,
|
|
&nr_pages);
|
|
|
|
if (rc == 0)
|
|
goto out;
|
|
|
|
rw_ctx = ceph_find_rw_context(fi);
|
|
max = fsc->mount_options->rsize >> PAGE_SHIFT;
|
|
dout("readpages %p file %p ctx %p nr_pages %d max %d\n",
|
|
inode, file, rw_ctx, nr_pages, max);
|
|
while (!list_empty(page_list)) {
|
|
rc = start_read(inode, rw_ctx, page_list, max);
|
|
if (rc < 0)
|
|
goto out;
|
|
}
|
|
out:
|
|
ceph_fscache_readpages_cancel(inode, page_list);
|
|
|
|
dout("readpages %p file %p ret %d\n", inode, file, rc);
|
|
return rc;
|
|
}
|
|
|
|
struct ceph_writeback_ctl
|
|
{
|
|
loff_t i_size;
|
|
u64 truncate_size;
|
|
u32 truncate_seq;
|
|
bool size_stable;
|
|
bool head_snapc;
|
|
};
|
|
|
|
/*
|
|
* Get ref for the oldest snapc for an inode with dirty data... that is, the
|
|
* only snap context we are allowed to write back.
|
|
*/
|
|
static struct ceph_snap_context *
|
|
get_oldest_context(struct inode *inode, struct ceph_writeback_ctl *ctl,
|
|
struct ceph_snap_context *page_snapc)
|
|
{
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
struct ceph_snap_context *snapc = NULL;
|
|
struct ceph_cap_snap *capsnap = NULL;
|
|
|
|
spin_lock(&ci->i_ceph_lock);
|
|
list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
|
|
dout(" cap_snap %p snapc %p has %d dirty pages\n", capsnap,
|
|
capsnap->context, capsnap->dirty_pages);
|
|
if (!capsnap->dirty_pages)
|
|
continue;
|
|
|
|
/* get i_size, truncate_{seq,size} for page_snapc? */
|
|
if (snapc && capsnap->context != page_snapc)
|
|
continue;
|
|
|
|
if (ctl) {
|
|
if (capsnap->writing) {
|
|
ctl->i_size = i_size_read(inode);
|
|
ctl->size_stable = false;
|
|
} else {
|
|
ctl->i_size = capsnap->size;
|
|
ctl->size_stable = true;
|
|
}
|
|
ctl->truncate_size = capsnap->truncate_size;
|
|
ctl->truncate_seq = capsnap->truncate_seq;
|
|
ctl->head_snapc = false;
|
|
}
|
|
|
|
if (snapc)
|
|
break;
|
|
|
|
snapc = ceph_get_snap_context(capsnap->context);
|
|
if (!page_snapc ||
|
|
page_snapc == snapc ||
|
|
page_snapc->seq > snapc->seq)
|
|
break;
|
|
}
|
|
if (!snapc && ci->i_wrbuffer_ref_head) {
|
|
snapc = ceph_get_snap_context(ci->i_head_snapc);
|
|
dout(" head snapc %p has %d dirty pages\n",
|
|
snapc, ci->i_wrbuffer_ref_head);
|
|
if (ctl) {
|
|
ctl->i_size = i_size_read(inode);
|
|
ctl->truncate_size = ci->i_truncate_size;
|
|
ctl->truncate_seq = ci->i_truncate_seq;
|
|
ctl->size_stable = false;
|
|
ctl->head_snapc = true;
|
|
}
|
|
}
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
return snapc;
|
|
}
|
|
|
|
static u64 get_writepages_data_length(struct inode *inode,
|
|
struct page *page, u64 start)
|
|
{
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
struct ceph_snap_context *snapc = page_snap_context(page);
|
|
struct ceph_cap_snap *capsnap = NULL;
|
|
u64 end = i_size_read(inode);
|
|
|
|
if (snapc != ci->i_head_snapc) {
|
|
bool found = false;
|
|
spin_lock(&ci->i_ceph_lock);
|
|
list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
|
|
if (capsnap->context == snapc) {
|
|
if (!capsnap->writing)
|
|
end = capsnap->size;
|
|
found = true;
|
|
break;
|
|
}
|
|
}
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
WARN_ON(!found);
|
|
}
|
|
if (end > page_offset(page) + PAGE_SIZE)
|
|
end = page_offset(page) + PAGE_SIZE;
|
|
return end > start ? end - start : 0;
|
|
}
|
|
|
|
/*
|
|
* Write a single page, but leave the page locked.
|
|
*
|
|
* If we get a write error, mark the mapping for error, but still adjust the
|
|
* dirty page accounting (i.e., page is no longer dirty).
|
|
*/
|
|
static int writepage_nounlock(struct page *page, struct writeback_control *wbc)
|
|
{
|
|
struct inode *inode = page->mapping->host;
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
|
|
struct ceph_snap_context *snapc, *oldest;
|
|
loff_t page_off = page_offset(page);
|
|
int err;
|
|
loff_t len = PAGE_SIZE;
|
|
struct ceph_writeback_ctl ceph_wbc;
|
|
struct ceph_osd_client *osdc = &fsc->client->osdc;
|
|
struct ceph_osd_request *req;
|
|
|
|
dout("writepage %p idx %lu\n", page, page->index);
|
|
|
|
/* verify this is a writeable snap context */
|
|
snapc = page_snap_context(page);
|
|
if (!snapc) {
|
|
dout("writepage %p page %p not dirty?\n", inode, page);
|
|
return 0;
|
|
}
|
|
oldest = get_oldest_context(inode, &ceph_wbc, snapc);
|
|
if (snapc->seq > oldest->seq) {
|
|
dout("writepage %p page %p snapc %p not writeable - noop\n",
|
|
inode, page, snapc);
|
|
/* we should only noop if called by kswapd */
|
|
WARN_ON(!(current->flags & PF_MEMALLOC));
|
|
ceph_put_snap_context(oldest);
|
|
redirty_page_for_writepage(wbc, page);
|
|
return 0;
|
|
}
|
|
ceph_put_snap_context(oldest);
|
|
|
|
/* is this a partial page at end of file? */
|
|
if (page_off >= ceph_wbc.i_size) {
|
|
dout("%p page eof %llu\n", page, ceph_wbc.i_size);
|
|
page->mapping->a_ops->invalidatepage(page, 0, PAGE_SIZE);
|
|
return 0;
|
|
}
|
|
|
|
if (ceph_wbc.i_size < page_off + len)
|
|
len = ceph_wbc.i_size - page_off;
|
|
|
|
dout("writepage %p page %p index %lu on %llu~%llu snapc %p seq %lld\n",
|
|
inode, page, page->index, page_off, len, snapc, snapc->seq);
|
|
|
|
if (atomic_long_inc_return(&fsc->writeback_count) >
|
|
CONGESTION_ON_THRESH(fsc->mount_options->congestion_kb))
|
|
set_bdi_congested(inode_to_bdi(inode), BLK_RW_ASYNC);
|
|
|
|
set_page_writeback(page);
|
|
req = ceph_osdc_new_request(osdc, &ci->i_layout, ceph_vino(inode), page_off, &len, 0, 1,
|
|
CEPH_OSD_OP_WRITE, CEPH_OSD_FLAG_WRITE, snapc,
|
|
ceph_wbc.truncate_seq, ceph_wbc.truncate_size,
|
|
true);
|
|
if (IS_ERR(req)) {
|
|
redirty_page_for_writepage(wbc, page);
|
|
end_page_writeback(page);
|
|
return PTR_ERR(req);
|
|
}
|
|
|
|
/* it may be a short write due to an object boundary */
|
|
WARN_ON_ONCE(len > PAGE_SIZE);
|
|
osd_req_op_extent_osd_data_pages(req, 0, &page, len, 0, false, false);
|
|
dout("writepage %llu~%llu (%llu bytes)\n", page_off, len, len);
|
|
|
|
req->r_mtime = inode->i_mtime;
|
|
err = ceph_osdc_start_request(osdc, req, true);
|
|
if (!err)
|
|
err = ceph_osdc_wait_request(osdc, req);
|
|
|
|
ceph_update_write_latency(&fsc->mdsc->metric, req->r_start_latency,
|
|
req->r_end_latency, err);
|
|
|
|
ceph_osdc_put_request(req);
|
|
if (err == 0)
|
|
err = len;
|
|
|
|
if (err < 0) {
|
|
struct writeback_control tmp_wbc;
|
|
if (!wbc)
|
|
wbc = &tmp_wbc;
|
|
if (err == -ERESTARTSYS) {
|
|
/* killed by SIGKILL */
|
|
dout("writepage interrupted page %p\n", page);
|
|
redirty_page_for_writepage(wbc, page);
|
|
end_page_writeback(page);
|
|
return err;
|
|
}
|
|
if (err == -EBLOCKLISTED)
|
|
fsc->blocklisted = true;
|
|
dout("writepage setting page/mapping error %d %p\n",
|
|
err, page);
|
|
mapping_set_error(&inode->i_data, err);
|
|
wbc->pages_skipped++;
|
|
} else {
|
|
dout("writepage cleaned page %p\n", page);
|
|
err = 0; /* vfs expects us to return 0 */
|
|
}
|
|
page->private = 0;
|
|
ClearPagePrivate(page);
|
|
end_page_writeback(page);
|
|
ceph_put_wrbuffer_cap_refs(ci, 1, snapc);
|
|
ceph_put_snap_context(snapc); /* page's reference */
|
|
|
|
if (atomic_long_dec_return(&fsc->writeback_count) <
|
|
CONGESTION_OFF_THRESH(fsc->mount_options->congestion_kb))
|
|
clear_bdi_congested(inode_to_bdi(inode), BLK_RW_ASYNC);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int ceph_writepage(struct page *page, struct writeback_control *wbc)
|
|
{
|
|
int err;
|
|
struct inode *inode = page->mapping->host;
|
|
BUG_ON(!inode);
|
|
ihold(inode);
|
|
err = writepage_nounlock(page, wbc);
|
|
if (err == -ERESTARTSYS) {
|
|
/* direct memory reclaimer was killed by SIGKILL. return 0
|
|
* to prevent caller from setting mapping/page error */
|
|
err = 0;
|
|
}
|
|
unlock_page(page);
|
|
iput(inode);
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* async writeback completion handler.
|
|
*
|
|
* If we get an error, set the mapping error bit, but not the individual
|
|
* page error bits.
|
|
*/
|
|
static void writepages_finish(struct ceph_osd_request *req)
|
|
{
|
|
struct inode *inode = req->r_inode;
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
struct ceph_osd_data *osd_data;
|
|
struct page *page;
|
|
int num_pages, total_pages = 0;
|
|
int i, j;
|
|
int rc = req->r_result;
|
|
struct ceph_snap_context *snapc = req->r_snapc;
|
|
struct address_space *mapping = inode->i_mapping;
|
|
struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
|
|
bool remove_page;
|
|
|
|
dout("writepages_finish %p rc %d\n", inode, rc);
|
|
if (rc < 0) {
|
|
mapping_set_error(mapping, rc);
|
|
ceph_set_error_write(ci);
|
|
if (rc == -EBLOCKLISTED)
|
|
fsc->blocklisted = true;
|
|
} else {
|
|
ceph_clear_error_write(ci);
|
|
}
|
|
|
|
ceph_update_write_latency(&fsc->mdsc->metric, req->r_start_latency,
|
|
req->r_end_latency, rc);
|
|
|
|
/*
|
|
* We lost the cache cap, need to truncate the page before
|
|
* it is unlocked, otherwise we'd truncate it later in the
|
|
* page truncation thread, possibly losing some data that
|
|
* raced its way in
|
|
*/
|
|
remove_page = !(ceph_caps_issued(ci) &
|
|
(CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO));
|
|
|
|
/* clean all pages */
|
|
for (i = 0; i < req->r_num_ops; i++) {
|
|
if (req->r_ops[i].op != CEPH_OSD_OP_WRITE)
|
|
break;
|
|
|
|
osd_data = osd_req_op_extent_osd_data(req, i);
|
|
BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGES);
|
|
num_pages = calc_pages_for((u64)osd_data->alignment,
|
|
(u64)osd_data->length);
|
|
total_pages += num_pages;
|
|
for (j = 0; j < num_pages; j++) {
|
|
page = osd_data->pages[j];
|
|
BUG_ON(!page);
|
|
WARN_ON(!PageUptodate(page));
|
|
|
|
if (atomic_long_dec_return(&fsc->writeback_count) <
|
|
CONGESTION_OFF_THRESH(
|
|
fsc->mount_options->congestion_kb))
|
|
clear_bdi_congested(inode_to_bdi(inode),
|
|
BLK_RW_ASYNC);
|
|
|
|
ceph_put_snap_context(page_snap_context(page));
|
|
page->private = 0;
|
|
ClearPagePrivate(page);
|
|
dout("unlocking %p\n", page);
|
|
end_page_writeback(page);
|
|
|
|
if (remove_page)
|
|
generic_error_remove_page(inode->i_mapping,
|
|
page);
|
|
|
|
unlock_page(page);
|
|
}
|
|
dout("writepages_finish %p wrote %llu bytes cleaned %d pages\n",
|
|
inode, osd_data->length, rc >= 0 ? num_pages : 0);
|
|
|
|
release_pages(osd_data->pages, num_pages);
|
|
}
|
|
|
|
ceph_put_wrbuffer_cap_refs(ci, total_pages, snapc);
|
|
|
|
osd_data = osd_req_op_extent_osd_data(req, 0);
|
|
if (osd_data->pages_from_pool)
|
|
mempool_free(osd_data->pages, ceph_wb_pagevec_pool);
|
|
else
|
|
kfree(osd_data->pages);
|
|
ceph_osdc_put_request(req);
|
|
}
|
|
|
|
/*
|
|
* initiate async writeback
|
|
*/
|
|
static int ceph_writepages_start(struct address_space *mapping,
|
|
struct writeback_control *wbc)
|
|
{
|
|
struct inode *inode = mapping->host;
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
|
|
struct ceph_vino vino = ceph_vino(inode);
|
|
pgoff_t index, start_index, end = -1;
|
|
struct ceph_snap_context *snapc = NULL, *last_snapc = NULL, *pgsnapc;
|
|
struct pagevec pvec;
|
|
int rc = 0;
|
|
unsigned int wsize = i_blocksize(inode);
|
|
struct ceph_osd_request *req = NULL;
|
|
struct ceph_writeback_ctl ceph_wbc;
|
|
bool should_loop, range_whole = false;
|
|
bool done = false;
|
|
|
|
dout("writepages_start %p (mode=%s)\n", inode,
|
|
wbc->sync_mode == WB_SYNC_NONE ? "NONE" :
|
|
(wbc->sync_mode == WB_SYNC_ALL ? "ALL" : "HOLD"));
|
|
|
|
if (READ_ONCE(fsc->mount_state) >= CEPH_MOUNT_SHUTDOWN) {
|
|
if (ci->i_wrbuffer_ref > 0) {
|
|
pr_warn_ratelimited(
|
|
"writepage_start %p %lld forced umount\n",
|
|
inode, ceph_ino(inode));
|
|
}
|
|
mapping_set_error(mapping, -EIO);
|
|
return -EIO; /* we're in a forced umount, don't write! */
|
|
}
|
|
if (fsc->mount_options->wsize < wsize)
|
|
wsize = fsc->mount_options->wsize;
|
|
|
|
pagevec_init(&pvec);
|
|
|
|
start_index = wbc->range_cyclic ? mapping->writeback_index : 0;
|
|
index = start_index;
|
|
|
|
retry:
|
|
/* find oldest snap context with dirty data */
|
|
snapc = get_oldest_context(inode, &ceph_wbc, NULL);
|
|
if (!snapc) {
|
|
/* hmm, why does writepages get called when there
|
|
is no dirty data? */
|
|
dout(" no snap context with dirty data?\n");
|
|
goto out;
|
|
}
|
|
dout(" oldest snapc is %p seq %lld (%d snaps)\n",
|
|
snapc, snapc->seq, snapc->num_snaps);
|
|
|
|
should_loop = false;
|
|
if (ceph_wbc.head_snapc && snapc != last_snapc) {
|
|
/* where to start/end? */
|
|
if (wbc->range_cyclic) {
|
|
index = start_index;
|
|
end = -1;
|
|
if (index > 0)
|
|
should_loop = true;
|
|
dout(" cyclic, start at %lu\n", index);
|
|
} else {
|
|
index = wbc->range_start >> PAGE_SHIFT;
|
|
end = wbc->range_end >> PAGE_SHIFT;
|
|
if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX)
|
|
range_whole = true;
|
|
dout(" not cyclic, %lu to %lu\n", index, end);
|
|
}
|
|
} else if (!ceph_wbc.head_snapc) {
|
|
/* Do not respect wbc->range_{start,end}. Dirty pages
|
|
* in that range can be associated with newer snapc.
|
|
* They are not writeable until we write all dirty pages
|
|
* associated with 'snapc' get written */
|
|
if (index > 0)
|
|
should_loop = true;
|
|
dout(" non-head snapc, range whole\n");
|
|
}
|
|
|
|
ceph_put_snap_context(last_snapc);
|
|
last_snapc = snapc;
|
|
|
|
while (!done && index <= end) {
|
|
int num_ops = 0, op_idx;
|
|
unsigned i, pvec_pages, max_pages, locked_pages = 0;
|
|
struct page **pages = NULL, **data_pages;
|
|
struct page *page;
|
|
pgoff_t strip_unit_end = 0;
|
|
u64 offset = 0, len = 0;
|
|
bool from_pool = false;
|
|
|
|
max_pages = wsize >> PAGE_SHIFT;
|
|
|
|
get_more_pages:
|
|
pvec_pages = pagevec_lookup_range_tag(&pvec, mapping, &index,
|
|
end, PAGECACHE_TAG_DIRTY);
|
|
dout("pagevec_lookup_range_tag got %d\n", pvec_pages);
|
|
if (!pvec_pages && !locked_pages)
|
|
break;
|
|
for (i = 0; i < pvec_pages && locked_pages < max_pages; i++) {
|
|
page = pvec.pages[i];
|
|
dout("? %p idx %lu\n", page, page->index);
|
|
if (locked_pages == 0)
|
|
lock_page(page); /* first page */
|
|
else if (!trylock_page(page))
|
|
break;
|
|
|
|
/* only dirty pages, or our accounting breaks */
|
|
if (unlikely(!PageDirty(page)) ||
|
|
unlikely(page->mapping != mapping)) {
|
|
dout("!dirty or !mapping %p\n", page);
|
|
unlock_page(page);
|
|
continue;
|
|
}
|
|
/* only if matching snap context */
|
|
pgsnapc = page_snap_context(page);
|
|
if (pgsnapc != snapc) {
|
|
dout("page snapc %p %lld != oldest %p %lld\n",
|
|
pgsnapc, pgsnapc->seq, snapc, snapc->seq);
|
|
if (!should_loop &&
|
|
!ceph_wbc.head_snapc &&
|
|
wbc->sync_mode != WB_SYNC_NONE)
|
|
should_loop = true;
|
|
unlock_page(page);
|
|
continue;
|
|
}
|
|
if (page_offset(page) >= ceph_wbc.i_size) {
|
|
dout("%p page eof %llu\n",
|
|
page, ceph_wbc.i_size);
|
|
if ((ceph_wbc.size_stable ||
|
|
page_offset(page) >= i_size_read(inode)) &&
|
|
clear_page_dirty_for_io(page))
|
|
mapping->a_ops->invalidatepage(page,
|
|
0, PAGE_SIZE);
|
|
unlock_page(page);
|
|
continue;
|
|
}
|
|
if (strip_unit_end && (page->index > strip_unit_end)) {
|
|
dout("end of strip unit %p\n", page);
|
|
unlock_page(page);
|
|
break;
|
|
}
|
|
if (PageWriteback(page)) {
|
|
if (wbc->sync_mode == WB_SYNC_NONE) {
|
|
dout("%p under writeback\n", page);
|
|
unlock_page(page);
|
|
continue;
|
|
}
|
|
dout("waiting on writeback %p\n", page);
|
|
wait_on_page_writeback(page);
|
|
}
|
|
|
|
if (!clear_page_dirty_for_io(page)) {
|
|
dout("%p !clear_page_dirty_for_io\n", page);
|
|
unlock_page(page);
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* We have something to write. If this is
|
|
* the first locked page this time through,
|
|
* calculate max possinle write size and
|
|
* allocate a page array
|
|
*/
|
|
if (locked_pages == 0) {
|
|
u64 objnum;
|
|
u64 objoff;
|
|
u32 xlen;
|
|
|
|
/* prepare async write request */
|
|
offset = (u64)page_offset(page);
|
|
ceph_calc_file_object_mapping(&ci->i_layout,
|
|
offset, wsize,
|
|
&objnum, &objoff,
|
|
&xlen);
|
|
len = xlen;
|
|
|
|
num_ops = 1;
|
|
strip_unit_end = page->index +
|
|
((len - 1) >> PAGE_SHIFT);
|
|
|
|
BUG_ON(pages);
|
|
max_pages = calc_pages_for(0, (u64)len);
|
|
pages = kmalloc_array(max_pages,
|
|
sizeof(*pages),
|
|
GFP_NOFS);
|
|
if (!pages) {
|
|
from_pool = true;
|
|
pages = mempool_alloc(ceph_wb_pagevec_pool, GFP_NOFS);
|
|
BUG_ON(!pages);
|
|
}
|
|
|
|
len = 0;
|
|
} else if (page->index !=
|
|
(offset + len) >> PAGE_SHIFT) {
|
|
if (num_ops >= (from_pool ? CEPH_OSD_SLAB_OPS :
|
|
CEPH_OSD_MAX_OPS)) {
|
|
redirty_page_for_writepage(wbc, page);
|
|
unlock_page(page);
|
|
break;
|
|
}
|
|
|
|
num_ops++;
|
|
offset = (u64)page_offset(page);
|
|
len = 0;
|
|
}
|
|
|
|
/* note position of first page in pvec */
|
|
dout("%p will write page %p idx %lu\n",
|
|
inode, page, page->index);
|
|
|
|
if (atomic_long_inc_return(&fsc->writeback_count) >
|
|
CONGESTION_ON_THRESH(
|
|
fsc->mount_options->congestion_kb)) {
|
|
set_bdi_congested(inode_to_bdi(inode),
|
|
BLK_RW_ASYNC);
|
|
}
|
|
|
|
|
|
pages[locked_pages++] = page;
|
|
pvec.pages[i] = NULL;
|
|
|
|
len += PAGE_SIZE;
|
|
}
|
|
|
|
/* did we get anything? */
|
|
if (!locked_pages)
|
|
goto release_pvec_pages;
|
|
if (i) {
|
|
unsigned j, n = 0;
|
|
/* shift unused page to beginning of pvec */
|
|
for (j = 0; j < pvec_pages; j++) {
|
|
if (!pvec.pages[j])
|
|
continue;
|
|
if (n < j)
|
|
pvec.pages[n] = pvec.pages[j];
|
|
n++;
|
|
}
|
|
pvec.nr = n;
|
|
|
|
if (pvec_pages && i == pvec_pages &&
|
|
locked_pages < max_pages) {
|
|
dout("reached end pvec, trying for more\n");
|
|
pagevec_release(&pvec);
|
|
goto get_more_pages;
|
|
}
|
|
}
|
|
|
|
new_request:
|
|
offset = page_offset(pages[0]);
|
|
len = wsize;
|
|
|
|
req = ceph_osdc_new_request(&fsc->client->osdc,
|
|
&ci->i_layout, vino,
|
|
offset, &len, 0, num_ops,
|
|
CEPH_OSD_OP_WRITE, CEPH_OSD_FLAG_WRITE,
|
|
snapc, ceph_wbc.truncate_seq,
|
|
ceph_wbc.truncate_size, false);
|
|
if (IS_ERR(req)) {
|
|
req = ceph_osdc_new_request(&fsc->client->osdc,
|
|
&ci->i_layout, vino,
|
|
offset, &len, 0,
|
|
min(num_ops,
|
|
CEPH_OSD_SLAB_OPS),
|
|
CEPH_OSD_OP_WRITE,
|
|
CEPH_OSD_FLAG_WRITE,
|
|
snapc, ceph_wbc.truncate_seq,
|
|
ceph_wbc.truncate_size, true);
|
|
BUG_ON(IS_ERR(req));
|
|
}
|
|
BUG_ON(len < page_offset(pages[locked_pages - 1]) +
|
|
PAGE_SIZE - offset);
|
|
|
|
req->r_callback = writepages_finish;
|
|
req->r_inode = inode;
|
|
|
|
/* Format the osd request message and submit the write */
|
|
len = 0;
|
|
data_pages = pages;
|
|
op_idx = 0;
|
|
for (i = 0; i < locked_pages; i++) {
|
|
u64 cur_offset = page_offset(pages[i]);
|
|
if (offset + len != cur_offset) {
|
|
if (op_idx + 1 == req->r_num_ops)
|
|
break;
|
|
osd_req_op_extent_dup_last(req, op_idx,
|
|
cur_offset - offset);
|
|
dout("writepages got pages at %llu~%llu\n",
|
|
offset, len);
|
|
osd_req_op_extent_osd_data_pages(req, op_idx,
|
|
data_pages, len, 0,
|
|
from_pool, false);
|
|
osd_req_op_extent_update(req, op_idx, len);
|
|
|
|
len = 0;
|
|
offset = cur_offset;
|
|
data_pages = pages + i;
|
|
op_idx++;
|
|
}
|
|
|
|
set_page_writeback(pages[i]);
|
|
len += PAGE_SIZE;
|
|
}
|
|
|
|
if (ceph_wbc.size_stable) {
|
|
len = min(len, ceph_wbc.i_size - offset);
|
|
} else if (i == locked_pages) {
|
|
/* writepages_finish() clears writeback pages
|
|
* according to the data length, so make sure
|
|
* data length covers all locked pages */
|
|
u64 min_len = len + 1 - PAGE_SIZE;
|
|
len = get_writepages_data_length(inode, pages[i - 1],
|
|
offset);
|
|
len = max(len, min_len);
|
|
}
|
|
dout("writepages got pages at %llu~%llu\n", offset, len);
|
|
|
|
osd_req_op_extent_osd_data_pages(req, op_idx, data_pages, len,
|
|
0, from_pool, false);
|
|
osd_req_op_extent_update(req, op_idx, len);
|
|
|
|
BUG_ON(op_idx + 1 != req->r_num_ops);
|
|
|
|
from_pool = false;
|
|
if (i < locked_pages) {
|
|
BUG_ON(num_ops <= req->r_num_ops);
|
|
num_ops -= req->r_num_ops;
|
|
locked_pages -= i;
|
|
|
|
/* allocate new pages array for next request */
|
|
data_pages = pages;
|
|
pages = kmalloc_array(locked_pages, sizeof(*pages),
|
|
GFP_NOFS);
|
|
if (!pages) {
|
|
from_pool = true;
|
|
pages = mempool_alloc(ceph_wb_pagevec_pool, GFP_NOFS);
|
|
BUG_ON(!pages);
|
|
}
|
|
memcpy(pages, data_pages + i,
|
|
locked_pages * sizeof(*pages));
|
|
memset(data_pages + i, 0,
|
|
locked_pages * sizeof(*pages));
|
|
} else {
|
|
BUG_ON(num_ops != req->r_num_ops);
|
|
index = pages[i - 1]->index + 1;
|
|
/* request message now owns the pages array */
|
|
pages = NULL;
|
|
}
|
|
|
|
req->r_mtime = inode->i_mtime;
|
|
rc = ceph_osdc_start_request(&fsc->client->osdc, req, true);
|
|
BUG_ON(rc);
|
|
req = NULL;
|
|
|
|
wbc->nr_to_write -= i;
|
|
if (pages)
|
|
goto new_request;
|
|
|
|
/*
|
|
* We stop writing back only if we are not doing
|
|
* integrity sync. In case of integrity sync we have to
|
|
* keep going until we have written all the pages
|
|
* we tagged for writeback prior to entering this loop.
|
|
*/
|
|
if (wbc->nr_to_write <= 0 && wbc->sync_mode == WB_SYNC_NONE)
|
|
done = true;
|
|
|
|
release_pvec_pages:
|
|
dout("pagevec_release on %d pages (%p)\n", (int)pvec.nr,
|
|
pvec.nr ? pvec.pages[0] : NULL);
|
|
pagevec_release(&pvec);
|
|
}
|
|
|
|
if (should_loop && !done) {
|
|
/* more to do; loop back to beginning of file */
|
|
dout("writepages looping back to beginning of file\n");
|
|
end = start_index - 1; /* OK even when start_index == 0 */
|
|
|
|
/* to write dirty pages associated with next snapc,
|
|
* we need to wait until current writes complete */
|
|
if (wbc->sync_mode != WB_SYNC_NONE &&
|
|
start_index == 0 && /* all dirty pages were checked */
|
|
!ceph_wbc.head_snapc) {
|
|
struct page *page;
|
|
unsigned i, nr;
|
|
index = 0;
|
|
while ((index <= end) &&
|
|
(nr = pagevec_lookup_tag(&pvec, mapping, &index,
|
|
PAGECACHE_TAG_WRITEBACK))) {
|
|
for (i = 0; i < nr; i++) {
|
|
page = pvec.pages[i];
|
|
if (page_snap_context(page) != snapc)
|
|
continue;
|
|
wait_on_page_writeback(page);
|
|
}
|
|
pagevec_release(&pvec);
|
|
cond_resched();
|
|
}
|
|
}
|
|
|
|
start_index = 0;
|
|
index = 0;
|
|
goto retry;
|
|
}
|
|
|
|
if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0))
|
|
mapping->writeback_index = index;
|
|
|
|
out:
|
|
ceph_osdc_put_request(req);
|
|
ceph_put_snap_context(last_snapc);
|
|
dout("writepages dend - startone, rc = %d\n", rc);
|
|
return rc;
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* See if a given @snapc is either writeable, or already written.
|
|
*/
|
|
static int context_is_writeable_or_written(struct inode *inode,
|
|
struct ceph_snap_context *snapc)
|
|
{
|
|
struct ceph_snap_context *oldest = get_oldest_context(inode, NULL, NULL);
|
|
int ret = !oldest || snapc->seq <= oldest->seq;
|
|
|
|
ceph_put_snap_context(oldest);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* ceph_find_incompatible - find an incompatible context and return it
|
|
* @page: page being dirtied
|
|
*
|
|
* We are only allowed to write into/dirty a page if the page is
|
|
* clean, or already dirty within the same snap context. Returns a
|
|
* conflicting context if there is one, NULL if there isn't, or a
|
|
* negative error code on other errors.
|
|
*
|
|
* Must be called with page lock held.
|
|
*/
|
|
static struct ceph_snap_context *
|
|
ceph_find_incompatible(struct page *page)
|
|
{
|
|
struct inode *inode = page->mapping->host;
|
|
struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
|
|
if (READ_ONCE(fsc->mount_state) >= CEPH_MOUNT_SHUTDOWN) {
|
|
dout(" page %p forced umount\n", page);
|
|
return ERR_PTR(-EIO);
|
|
}
|
|
|
|
for (;;) {
|
|
struct ceph_snap_context *snapc, *oldest;
|
|
|
|
wait_on_page_writeback(page);
|
|
|
|
snapc = page_snap_context(page);
|
|
if (!snapc || snapc == ci->i_head_snapc)
|
|
break;
|
|
|
|
/*
|
|
* this page is already dirty in another (older) snap
|
|
* context! is it writeable now?
|
|
*/
|
|
oldest = get_oldest_context(inode, NULL, NULL);
|
|
if (snapc->seq > oldest->seq) {
|
|
/* not writeable -- return it for the caller to deal with */
|
|
ceph_put_snap_context(oldest);
|
|
dout(" page %p snapc %p not current or oldest\n", page, snapc);
|
|
return ceph_get_snap_context(snapc);
|
|
}
|
|
ceph_put_snap_context(oldest);
|
|
|
|
/* yay, writeable, do it now (without dropping page lock) */
|
|
dout(" page %p snapc %p not current, but oldest\n", page, snapc);
|
|
if (clear_page_dirty_for_io(page)) {
|
|
int r = writepage_nounlock(page, NULL);
|
|
if (r < 0)
|
|
return ERR_PTR(r);
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* We are only allowed to write into/dirty the page if the page is
|
|
* clean, or already dirty within the same snap context.
|
|
*/
|
|
static int ceph_write_begin(struct file *file, struct address_space *mapping,
|
|
loff_t pos, unsigned len, unsigned flags,
|
|
struct page **pagep, void **fsdata)
|
|
{
|
|
struct inode *inode = file_inode(file);
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
struct ceph_snap_context *snapc;
|
|
struct page *page = NULL;
|
|
pgoff_t index = pos >> PAGE_SHIFT;
|
|
int pos_in_page = pos & ~PAGE_MASK;
|
|
int r = 0;
|
|
|
|
dout("write_begin file %p inode %p page %p %d~%d\n", file, inode, page, (int)pos, (int)len);
|
|
|
|
for (;;) {
|
|
page = grab_cache_page_write_begin(mapping, index, flags);
|
|
if (!page) {
|
|
r = -ENOMEM;
|
|
break;
|
|
}
|
|
|
|
snapc = ceph_find_incompatible(page);
|
|
if (snapc) {
|
|
if (IS_ERR(snapc)) {
|
|
r = PTR_ERR(snapc);
|
|
break;
|
|
}
|
|
unlock_page(page);
|
|
put_page(page);
|
|
page = NULL;
|
|
ceph_queue_writeback(inode);
|
|
r = wait_event_killable(ci->i_cap_wq,
|
|
context_is_writeable_or_written(inode, snapc));
|
|
ceph_put_snap_context(snapc);
|
|
if (r != 0)
|
|
break;
|
|
continue;
|
|
}
|
|
|
|
if (PageUptodate(page)) {
|
|
dout(" page %p already uptodate\n", page);
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* In some cases we don't need to read at all:
|
|
* - full page write
|
|
* - write that lies completely beyond EOF
|
|
* - write that covers the the page from start to EOF or beyond it
|
|
*/
|
|
if ((pos_in_page == 0 && len == PAGE_SIZE) ||
|
|
(pos >= i_size_read(inode)) ||
|
|
(pos_in_page == 0 && (pos + len) >= i_size_read(inode))) {
|
|
zero_user_segments(page, 0, pos_in_page,
|
|
pos_in_page + len, PAGE_SIZE);
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* We need to read it. If we get back -EINPROGRESS, then the page was
|
|
* handed off to fscache and it will be unlocked when the read completes.
|
|
* Refind the page in that case so we can reacquire the page lock. Otherwise
|
|
* we got a hard error or the read was completed synchronously.
|
|
*/
|
|
r = ceph_do_readpage(file, page);
|
|
if (r != -EINPROGRESS)
|
|
break;
|
|
}
|
|
|
|
if (r < 0) {
|
|
if (page) {
|
|
unlock_page(page);
|
|
put_page(page);
|
|
}
|
|
} else {
|
|
*pagep = page;
|
|
}
|
|
return r;
|
|
}
|
|
|
|
/*
|
|
* we don't do anything in here that simple_write_end doesn't do
|
|
* except adjust dirty page accounting
|
|
*/
|
|
static int ceph_write_end(struct file *file, struct address_space *mapping,
|
|
loff_t pos, unsigned len, unsigned copied,
|
|
struct page *page, void *fsdata)
|
|
{
|
|
struct inode *inode = file_inode(file);
|
|
bool check_cap = false;
|
|
|
|
dout("write_end file %p inode %p page %p %d~%d (%d)\n", file,
|
|
inode, page, (int)pos, (int)copied, (int)len);
|
|
|
|
/* zero the stale part of the page if we did a short copy */
|
|
if (!PageUptodate(page)) {
|
|
if (copied < len) {
|
|
copied = 0;
|
|
goto out;
|
|
}
|
|
SetPageUptodate(page);
|
|
}
|
|
|
|
/* did file size increase? */
|
|
if (pos+copied > i_size_read(inode))
|
|
check_cap = ceph_inode_set_size(inode, pos+copied);
|
|
|
|
set_page_dirty(page);
|
|
|
|
out:
|
|
unlock_page(page);
|
|
put_page(page);
|
|
|
|
if (check_cap)
|
|
ceph_check_caps(ceph_inode(inode), CHECK_CAPS_AUTHONLY, NULL);
|
|
|
|
return copied;
|
|
}
|
|
|
|
/*
|
|
* we set .direct_IO to indicate direct io is supported, but since we
|
|
* intercept O_DIRECT reads and writes early, this function should
|
|
* never get called.
|
|
*/
|
|
static ssize_t ceph_direct_io(struct kiocb *iocb, struct iov_iter *iter)
|
|
{
|
|
WARN_ON(1);
|
|
return -EINVAL;
|
|
}
|
|
|
|
const struct address_space_operations ceph_aops = {
|
|
.readpage = ceph_readpage,
|
|
.readpages = ceph_readpages,
|
|
.writepage = ceph_writepage,
|
|
.writepages = ceph_writepages_start,
|
|
.write_begin = ceph_write_begin,
|
|
.write_end = ceph_write_end,
|
|
.set_page_dirty = ceph_set_page_dirty,
|
|
.invalidatepage = ceph_invalidatepage,
|
|
.releasepage = ceph_releasepage,
|
|
.direct_IO = ceph_direct_io,
|
|
};
|
|
|
|
static void ceph_block_sigs(sigset_t *oldset)
|
|
{
|
|
sigset_t mask;
|
|
siginitsetinv(&mask, sigmask(SIGKILL));
|
|
sigprocmask(SIG_BLOCK, &mask, oldset);
|
|
}
|
|
|
|
static void ceph_restore_sigs(sigset_t *oldset)
|
|
{
|
|
sigprocmask(SIG_SETMASK, oldset, NULL);
|
|
}
|
|
|
|
/*
|
|
* vm ops
|
|
*/
|
|
static vm_fault_t ceph_filemap_fault(struct vm_fault *vmf)
|
|
{
|
|
struct vm_area_struct *vma = vmf->vma;
|
|
struct inode *inode = file_inode(vma->vm_file);
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
struct ceph_file_info *fi = vma->vm_file->private_data;
|
|
struct page *pinned_page = NULL;
|
|
loff_t off = (loff_t)vmf->pgoff << PAGE_SHIFT;
|
|
int want, got, err;
|
|
sigset_t oldset;
|
|
vm_fault_t ret = VM_FAULT_SIGBUS;
|
|
|
|
ceph_block_sigs(&oldset);
|
|
|
|
dout("filemap_fault %p %llx.%llx %llu~%zd trying to get caps\n",
|
|
inode, ceph_vinop(inode), off, (size_t)PAGE_SIZE);
|
|
if (fi->fmode & CEPH_FILE_MODE_LAZY)
|
|
want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO;
|
|
else
|
|
want = CEPH_CAP_FILE_CACHE;
|
|
|
|
got = 0;
|
|
err = ceph_get_caps(vma->vm_file, CEPH_CAP_FILE_RD, want, -1,
|
|
&got, &pinned_page);
|
|
if (err < 0)
|
|
goto out_restore;
|
|
|
|
dout("filemap_fault %p %llu~%zd got cap refs on %s\n",
|
|
inode, off, (size_t)PAGE_SIZE, ceph_cap_string(got));
|
|
|
|
if ((got & (CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO)) ||
|
|
ci->i_inline_version == CEPH_INLINE_NONE) {
|
|
CEPH_DEFINE_RW_CONTEXT(rw_ctx, got);
|
|
ceph_add_rw_context(fi, &rw_ctx);
|
|
ret = filemap_fault(vmf);
|
|
ceph_del_rw_context(fi, &rw_ctx);
|
|
dout("filemap_fault %p %llu~%zd drop cap refs %s ret %x\n",
|
|
inode, off, (size_t)PAGE_SIZE,
|
|
ceph_cap_string(got), ret);
|
|
} else
|
|
err = -EAGAIN;
|
|
|
|
if (pinned_page)
|
|
put_page(pinned_page);
|
|
ceph_put_cap_refs(ci, got);
|
|
|
|
if (err != -EAGAIN)
|
|
goto out_restore;
|
|
|
|
/* read inline data */
|
|
if (off >= PAGE_SIZE) {
|
|
/* does not support inline data > PAGE_SIZE */
|
|
ret = VM_FAULT_SIGBUS;
|
|
} else {
|
|
struct address_space *mapping = inode->i_mapping;
|
|
struct page *page = find_or_create_page(mapping, 0,
|
|
mapping_gfp_constraint(mapping,
|
|
~__GFP_FS));
|
|
if (!page) {
|
|
ret = VM_FAULT_OOM;
|
|
goto out_inline;
|
|
}
|
|
err = __ceph_do_getattr(inode, page,
|
|
CEPH_STAT_CAP_INLINE_DATA, true);
|
|
if (err < 0 || off >= i_size_read(inode)) {
|
|
unlock_page(page);
|
|
put_page(page);
|
|
ret = vmf_error(err);
|
|
goto out_inline;
|
|
}
|
|
if (err < PAGE_SIZE)
|
|
zero_user_segment(page, err, PAGE_SIZE);
|
|
else
|
|
flush_dcache_page(page);
|
|
SetPageUptodate(page);
|
|
vmf->page = page;
|
|
ret = VM_FAULT_MAJOR | VM_FAULT_LOCKED;
|
|
out_inline:
|
|
dout("filemap_fault %p %llu~%zd read inline data ret %x\n",
|
|
inode, off, (size_t)PAGE_SIZE, ret);
|
|
}
|
|
out_restore:
|
|
ceph_restore_sigs(&oldset);
|
|
if (err < 0)
|
|
ret = vmf_error(err);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Reuse write_begin here for simplicity.
|
|
*/
|
|
static vm_fault_t ceph_page_mkwrite(struct vm_fault *vmf)
|
|
{
|
|
struct vm_area_struct *vma = vmf->vma;
|
|
struct inode *inode = file_inode(vma->vm_file);
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
struct ceph_file_info *fi = vma->vm_file->private_data;
|
|
struct ceph_cap_flush *prealloc_cf;
|
|
struct page *page = vmf->page;
|
|
loff_t off = page_offset(page);
|
|
loff_t size = i_size_read(inode);
|
|
size_t len;
|
|
int want, got, err;
|
|
sigset_t oldset;
|
|
vm_fault_t ret = VM_FAULT_SIGBUS;
|
|
|
|
prealloc_cf = ceph_alloc_cap_flush();
|
|
if (!prealloc_cf)
|
|
return VM_FAULT_OOM;
|
|
|
|
sb_start_pagefault(inode->i_sb);
|
|
ceph_block_sigs(&oldset);
|
|
|
|
if (ci->i_inline_version != CEPH_INLINE_NONE) {
|
|
struct page *locked_page = NULL;
|
|
if (off == 0) {
|
|
lock_page(page);
|
|
locked_page = page;
|
|
}
|
|
err = ceph_uninline_data(vma->vm_file, locked_page);
|
|
if (locked_page)
|
|
unlock_page(locked_page);
|
|
if (err < 0)
|
|
goto out_free;
|
|
}
|
|
|
|
if (off + PAGE_SIZE <= size)
|
|
len = PAGE_SIZE;
|
|
else
|
|
len = size & ~PAGE_MASK;
|
|
|
|
dout("page_mkwrite %p %llx.%llx %llu~%zd getting caps i_size %llu\n",
|
|
inode, ceph_vinop(inode), off, len, size);
|
|
if (fi->fmode & CEPH_FILE_MODE_LAZY)
|
|
want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO;
|
|
else
|
|
want = CEPH_CAP_FILE_BUFFER;
|
|
|
|
got = 0;
|
|
err = ceph_get_caps(vma->vm_file, CEPH_CAP_FILE_WR, want, off + len,
|
|
&got, NULL);
|
|
if (err < 0)
|
|
goto out_free;
|
|
|
|
dout("page_mkwrite %p %llu~%zd got cap refs on %s\n",
|
|
inode, off, len, ceph_cap_string(got));
|
|
|
|
/* Update time before taking page lock */
|
|
file_update_time(vma->vm_file);
|
|
inode_inc_iversion_raw(inode);
|
|
|
|
do {
|
|
struct ceph_snap_context *snapc;
|
|
|
|
lock_page(page);
|
|
|
|
if (page_mkwrite_check_truncate(page, inode) < 0) {
|
|
unlock_page(page);
|
|
ret = VM_FAULT_NOPAGE;
|
|
break;
|
|
}
|
|
|
|
snapc = ceph_find_incompatible(page);
|
|
if (!snapc) {
|
|
/* success. we'll keep the page locked. */
|
|
set_page_dirty(page);
|
|
ret = VM_FAULT_LOCKED;
|
|
break;
|
|
}
|
|
|
|
unlock_page(page);
|
|
|
|
if (IS_ERR(snapc)) {
|
|
ret = VM_FAULT_SIGBUS;
|
|
break;
|
|
}
|
|
|
|
ceph_queue_writeback(inode);
|
|
err = wait_event_killable(ci->i_cap_wq,
|
|
context_is_writeable_or_written(inode, snapc));
|
|
ceph_put_snap_context(snapc);
|
|
} while (err == 0);
|
|
|
|
if (ret == VM_FAULT_LOCKED ||
|
|
ci->i_inline_version != CEPH_INLINE_NONE) {
|
|
int dirty;
|
|
spin_lock(&ci->i_ceph_lock);
|
|
ci->i_inline_version = CEPH_INLINE_NONE;
|
|
dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
|
|
&prealloc_cf);
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
if (dirty)
|
|
__mark_inode_dirty(inode, dirty);
|
|
}
|
|
|
|
dout("page_mkwrite %p %llu~%zd dropping cap refs on %s ret %x\n",
|
|
inode, off, len, ceph_cap_string(got), ret);
|
|
ceph_put_cap_refs_async(ci, got);
|
|
out_free:
|
|
ceph_restore_sigs(&oldset);
|
|
sb_end_pagefault(inode->i_sb);
|
|
ceph_free_cap_flush(prealloc_cf);
|
|
if (err < 0)
|
|
ret = vmf_error(err);
|
|
return ret;
|
|
}
|
|
|
|
void ceph_fill_inline_data(struct inode *inode, struct page *locked_page,
|
|
char *data, size_t len)
|
|
{
|
|
struct address_space *mapping = inode->i_mapping;
|
|
struct page *page;
|
|
|
|
if (locked_page) {
|
|
page = locked_page;
|
|
} else {
|
|
if (i_size_read(inode) == 0)
|
|
return;
|
|
page = find_or_create_page(mapping, 0,
|
|
mapping_gfp_constraint(mapping,
|
|
~__GFP_FS));
|
|
if (!page)
|
|
return;
|
|
if (PageUptodate(page)) {
|
|
unlock_page(page);
|
|
put_page(page);
|
|
return;
|
|
}
|
|
}
|
|
|
|
dout("fill_inline_data %p %llx.%llx len %zu locked_page %p\n",
|
|
inode, ceph_vinop(inode), len, locked_page);
|
|
|
|
if (len > 0) {
|
|
void *kaddr = kmap_atomic(page);
|
|
memcpy(kaddr, data, len);
|
|
kunmap_atomic(kaddr);
|
|
}
|
|
|
|
if (page != locked_page) {
|
|
if (len < PAGE_SIZE)
|
|
zero_user_segment(page, len, PAGE_SIZE);
|
|
else
|
|
flush_dcache_page(page);
|
|
|
|
SetPageUptodate(page);
|
|
unlock_page(page);
|
|
put_page(page);
|
|
}
|
|
}
|
|
|
|
int ceph_uninline_data(struct file *filp, struct page *locked_page)
|
|
{
|
|
struct inode *inode = file_inode(filp);
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
|
|
struct ceph_osd_request *req;
|
|
struct page *page = NULL;
|
|
u64 len, inline_version;
|
|
int err = 0;
|
|
bool from_pagecache = false;
|
|
|
|
spin_lock(&ci->i_ceph_lock);
|
|
inline_version = ci->i_inline_version;
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
|
|
dout("uninline_data %p %llx.%llx inline_version %llu\n",
|
|
inode, ceph_vinop(inode), inline_version);
|
|
|
|
if (inline_version == 1 || /* initial version, no data */
|
|
inline_version == CEPH_INLINE_NONE)
|
|
goto out;
|
|
|
|
if (locked_page) {
|
|
page = locked_page;
|
|
WARN_ON(!PageUptodate(page));
|
|
} else if (ceph_caps_issued(ci) &
|
|
(CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) {
|
|
page = find_get_page(inode->i_mapping, 0);
|
|
if (page) {
|
|
if (PageUptodate(page)) {
|
|
from_pagecache = true;
|
|
lock_page(page);
|
|
} else {
|
|
put_page(page);
|
|
page = NULL;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (page) {
|
|
len = i_size_read(inode);
|
|
if (len > PAGE_SIZE)
|
|
len = PAGE_SIZE;
|
|
} else {
|
|
page = __page_cache_alloc(GFP_NOFS);
|
|
if (!page) {
|
|
err = -ENOMEM;
|
|
goto out;
|
|
}
|
|
err = __ceph_do_getattr(inode, page,
|
|
CEPH_STAT_CAP_INLINE_DATA, true);
|
|
if (err < 0) {
|
|
/* no inline data */
|
|
if (err == -ENODATA)
|
|
err = 0;
|
|
goto out;
|
|
}
|
|
len = err;
|
|
}
|
|
|
|
req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
|
|
ceph_vino(inode), 0, &len, 0, 1,
|
|
CEPH_OSD_OP_CREATE, CEPH_OSD_FLAG_WRITE,
|
|
NULL, 0, 0, false);
|
|
if (IS_ERR(req)) {
|
|
err = PTR_ERR(req);
|
|
goto out;
|
|
}
|
|
|
|
req->r_mtime = inode->i_mtime;
|
|
err = ceph_osdc_start_request(&fsc->client->osdc, req, false);
|
|
if (!err)
|
|
err = ceph_osdc_wait_request(&fsc->client->osdc, req);
|
|
ceph_osdc_put_request(req);
|
|
if (err < 0)
|
|
goto out;
|
|
|
|
req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
|
|
ceph_vino(inode), 0, &len, 1, 3,
|
|
CEPH_OSD_OP_WRITE, CEPH_OSD_FLAG_WRITE,
|
|
NULL, ci->i_truncate_seq,
|
|
ci->i_truncate_size, false);
|
|
if (IS_ERR(req)) {
|
|
err = PTR_ERR(req);
|
|
goto out;
|
|
}
|
|
|
|
osd_req_op_extent_osd_data_pages(req, 1, &page, len, 0, false, false);
|
|
|
|
{
|
|
__le64 xattr_buf = cpu_to_le64(inline_version);
|
|
err = osd_req_op_xattr_init(req, 0, CEPH_OSD_OP_CMPXATTR,
|
|
"inline_version", &xattr_buf,
|
|
sizeof(xattr_buf),
|
|
CEPH_OSD_CMPXATTR_OP_GT,
|
|
CEPH_OSD_CMPXATTR_MODE_U64);
|
|
if (err)
|
|
goto out_put;
|
|
}
|
|
|
|
{
|
|
char xattr_buf[32];
|
|
int xattr_len = snprintf(xattr_buf, sizeof(xattr_buf),
|
|
"%llu", inline_version);
|
|
err = osd_req_op_xattr_init(req, 2, CEPH_OSD_OP_SETXATTR,
|
|
"inline_version",
|
|
xattr_buf, xattr_len, 0, 0);
|
|
if (err)
|
|
goto out_put;
|
|
}
|
|
|
|
req->r_mtime = inode->i_mtime;
|
|
err = ceph_osdc_start_request(&fsc->client->osdc, req, false);
|
|
if (!err)
|
|
err = ceph_osdc_wait_request(&fsc->client->osdc, req);
|
|
|
|
ceph_update_write_latency(&fsc->mdsc->metric, req->r_start_latency,
|
|
req->r_end_latency, err);
|
|
|
|
out_put:
|
|
ceph_osdc_put_request(req);
|
|
if (err == -ECANCELED)
|
|
err = 0;
|
|
out:
|
|
if (page && page != locked_page) {
|
|
if (from_pagecache) {
|
|
unlock_page(page);
|
|
put_page(page);
|
|
} else
|
|
__free_pages(page, 0);
|
|
}
|
|
|
|
dout("uninline_data %p %llx.%llx inline_version %llu = %d\n",
|
|
inode, ceph_vinop(inode), inline_version, err);
|
|
return err;
|
|
}
|
|
|
|
static const struct vm_operations_struct ceph_vmops = {
|
|
.fault = ceph_filemap_fault,
|
|
.page_mkwrite = ceph_page_mkwrite,
|
|
};
|
|
|
|
int ceph_mmap(struct file *file, struct vm_area_struct *vma)
|
|
{
|
|
struct address_space *mapping = file->f_mapping;
|
|
|
|
if (!mapping->a_ops->readpage)
|
|
return -ENOEXEC;
|
|
file_accessed(file);
|
|
vma->vm_ops = &ceph_vmops;
|
|
return 0;
|
|
}
|
|
|
|
enum {
|
|
POOL_READ = 1,
|
|
POOL_WRITE = 2,
|
|
};
|
|
|
|
static int __ceph_pool_perm_get(struct ceph_inode_info *ci,
|
|
s64 pool, struct ceph_string *pool_ns)
|
|
{
|
|
struct ceph_fs_client *fsc = ceph_inode_to_client(&ci->vfs_inode);
|
|
struct ceph_mds_client *mdsc = fsc->mdsc;
|
|
struct ceph_osd_request *rd_req = NULL, *wr_req = NULL;
|
|
struct rb_node **p, *parent;
|
|
struct ceph_pool_perm *perm;
|
|
struct page **pages;
|
|
size_t pool_ns_len;
|
|
int err = 0, err2 = 0, have = 0;
|
|
|
|
down_read(&mdsc->pool_perm_rwsem);
|
|
p = &mdsc->pool_perm_tree.rb_node;
|
|
while (*p) {
|
|
perm = rb_entry(*p, struct ceph_pool_perm, node);
|
|
if (pool < perm->pool)
|
|
p = &(*p)->rb_left;
|
|
else if (pool > perm->pool)
|
|
p = &(*p)->rb_right;
|
|
else {
|
|
int ret = ceph_compare_string(pool_ns,
|
|
perm->pool_ns,
|
|
perm->pool_ns_len);
|
|
if (ret < 0)
|
|
p = &(*p)->rb_left;
|
|
else if (ret > 0)
|
|
p = &(*p)->rb_right;
|
|
else {
|
|
have = perm->perm;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
up_read(&mdsc->pool_perm_rwsem);
|
|
if (*p)
|
|
goto out;
|
|
|
|
if (pool_ns)
|
|
dout("__ceph_pool_perm_get pool %lld ns %.*s no perm cached\n",
|
|
pool, (int)pool_ns->len, pool_ns->str);
|
|
else
|
|
dout("__ceph_pool_perm_get pool %lld no perm cached\n", pool);
|
|
|
|
down_write(&mdsc->pool_perm_rwsem);
|
|
p = &mdsc->pool_perm_tree.rb_node;
|
|
parent = NULL;
|
|
while (*p) {
|
|
parent = *p;
|
|
perm = rb_entry(parent, struct ceph_pool_perm, node);
|
|
if (pool < perm->pool)
|
|
p = &(*p)->rb_left;
|
|
else if (pool > perm->pool)
|
|
p = &(*p)->rb_right;
|
|
else {
|
|
int ret = ceph_compare_string(pool_ns,
|
|
perm->pool_ns,
|
|
perm->pool_ns_len);
|
|
if (ret < 0)
|
|
p = &(*p)->rb_left;
|
|
else if (ret > 0)
|
|
p = &(*p)->rb_right;
|
|
else {
|
|
have = perm->perm;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
if (*p) {
|
|
up_write(&mdsc->pool_perm_rwsem);
|
|
goto out;
|
|
}
|
|
|
|
rd_req = ceph_osdc_alloc_request(&fsc->client->osdc, NULL,
|
|
1, false, GFP_NOFS);
|
|
if (!rd_req) {
|
|
err = -ENOMEM;
|
|
goto out_unlock;
|
|
}
|
|
|
|
rd_req->r_flags = CEPH_OSD_FLAG_READ;
|
|
osd_req_op_init(rd_req, 0, CEPH_OSD_OP_STAT, 0);
|
|
rd_req->r_base_oloc.pool = pool;
|
|
if (pool_ns)
|
|
rd_req->r_base_oloc.pool_ns = ceph_get_string(pool_ns);
|
|
ceph_oid_printf(&rd_req->r_base_oid, "%llx.00000000", ci->i_vino.ino);
|
|
|
|
err = ceph_osdc_alloc_messages(rd_req, GFP_NOFS);
|
|
if (err)
|
|
goto out_unlock;
|
|
|
|
wr_req = ceph_osdc_alloc_request(&fsc->client->osdc, NULL,
|
|
1, false, GFP_NOFS);
|
|
if (!wr_req) {
|
|
err = -ENOMEM;
|
|
goto out_unlock;
|
|
}
|
|
|
|
wr_req->r_flags = CEPH_OSD_FLAG_WRITE;
|
|
osd_req_op_init(wr_req, 0, CEPH_OSD_OP_CREATE, CEPH_OSD_OP_FLAG_EXCL);
|
|
ceph_oloc_copy(&wr_req->r_base_oloc, &rd_req->r_base_oloc);
|
|
ceph_oid_copy(&wr_req->r_base_oid, &rd_req->r_base_oid);
|
|
|
|
err = ceph_osdc_alloc_messages(wr_req, GFP_NOFS);
|
|
if (err)
|
|
goto out_unlock;
|
|
|
|
/* one page should be large enough for STAT data */
|
|
pages = ceph_alloc_page_vector(1, GFP_KERNEL);
|
|
if (IS_ERR(pages)) {
|
|
err = PTR_ERR(pages);
|
|
goto out_unlock;
|
|
}
|
|
|
|
osd_req_op_raw_data_in_pages(rd_req, 0, pages, PAGE_SIZE,
|
|
0, false, true);
|
|
err = ceph_osdc_start_request(&fsc->client->osdc, rd_req, false);
|
|
|
|
wr_req->r_mtime = ci->vfs_inode.i_mtime;
|
|
err2 = ceph_osdc_start_request(&fsc->client->osdc, wr_req, false);
|
|
|
|
if (!err)
|
|
err = ceph_osdc_wait_request(&fsc->client->osdc, rd_req);
|
|
if (!err2)
|
|
err2 = ceph_osdc_wait_request(&fsc->client->osdc, wr_req);
|
|
|
|
if (err >= 0 || err == -ENOENT)
|
|
have |= POOL_READ;
|
|
else if (err != -EPERM) {
|
|
if (err == -EBLOCKLISTED)
|
|
fsc->blocklisted = true;
|
|
goto out_unlock;
|
|
}
|
|
|
|
if (err2 == 0 || err2 == -EEXIST)
|
|
have |= POOL_WRITE;
|
|
else if (err2 != -EPERM) {
|
|
if (err2 == -EBLOCKLISTED)
|
|
fsc->blocklisted = true;
|
|
err = err2;
|
|
goto out_unlock;
|
|
}
|
|
|
|
pool_ns_len = pool_ns ? pool_ns->len : 0;
|
|
perm = kmalloc(sizeof(*perm) + pool_ns_len + 1, GFP_NOFS);
|
|
if (!perm) {
|
|
err = -ENOMEM;
|
|
goto out_unlock;
|
|
}
|
|
|
|
perm->pool = pool;
|
|
perm->perm = have;
|
|
perm->pool_ns_len = pool_ns_len;
|
|
if (pool_ns_len > 0)
|
|
memcpy(perm->pool_ns, pool_ns->str, pool_ns_len);
|
|
perm->pool_ns[pool_ns_len] = 0;
|
|
|
|
rb_link_node(&perm->node, parent, p);
|
|
rb_insert_color(&perm->node, &mdsc->pool_perm_tree);
|
|
err = 0;
|
|
out_unlock:
|
|
up_write(&mdsc->pool_perm_rwsem);
|
|
|
|
ceph_osdc_put_request(rd_req);
|
|
ceph_osdc_put_request(wr_req);
|
|
out:
|
|
if (!err)
|
|
err = have;
|
|
if (pool_ns)
|
|
dout("__ceph_pool_perm_get pool %lld ns %.*s result = %d\n",
|
|
pool, (int)pool_ns->len, pool_ns->str, err);
|
|
else
|
|
dout("__ceph_pool_perm_get pool %lld result = %d\n", pool, err);
|
|
return err;
|
|
}
|
|
|
|
int ceph_pool_perm_check(struct inode *inode, int need)
|
|
{
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
struct ceph_string *pool_ns;
|
|
s64 pool;
|
|
int ret, flags;
|
|
|
|
if (ci->i_vino.snap != CEPH_NOSNAP) {
|
|
/*
|
|
* Pool permission check needs to write to the first object.
|
|
* But for snapshot, head of the first object may have alread
|
|
* been deleted. Skip check to avoid creating orphan object.
|
|
*/
|
|
return 0;
|
|
}
|
|
|
|
if (ceph_test_mount_opt(ceph_inode_to_client(inode),
|
|
NOPOOLPERM))
|
|
return 0;
|
|
|
|
spin_lock(&ci->i_ceph_lock);
|
|
flags = ci->i_ceph_flags;
|
|
pool = ci->i_layout.pool_id;
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
check:
|
|
if (flags & CEPH_I_POOL_PERM) {
|
|
if ((need & CEPH_CAP_FILE_RD) && !(flags & CEPH_I_POOL_RD)) {
|
|
dout("ceph_pool_perm_check pool %lld no read perm\n",
|
|
pool);
|
|
return -EPERM;
|
|
}
|
|
if ((need & CEPH_CAP_FILE_WR) && !(flags & CEPH_I_POOL_WR)) {
|
|
dout("ceph_pool_perm_check pool %lld no write perm\n",
|
|
pool);
|
|
return -EPERM;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
pool_ns = ceph_try_get_string(ci->i_layout.pool_ns);
|
|
ret = __ceph_pool_perm_get(ci, pool, pool_ns);
|
|
ceph_put_string(pool_ns);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
flags = CEPH_I_POOL_PERM;
|
|
if (ret & POOL_READ)
|
|
flags |= CEPH_I_POOL_RD;
|
|
if (ret & POOL_WRITE)
|
|
flags |= CEPH_I_POOL_WR;
|
|
|
|
spin_lock(&ci->i_ceph_lock);
|
|
if (pool == ci->i_layout.pool_id &&
|
|
pool_ns == rcu_dereference_raw(ci->i_layout.pool_ns)) {
|
|
ci->i_ceph_flags |= flags;
|
|
} else {
|
|
pool = ci->i_layout.pool_id;
|
|
flags = ci->i_ceph_flags;
|
|
}
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
goto check;
|
|
}
|
|
|
|
void ceph_pool_perm_destroy(struct ceph_mds_client *mdsc)
|
|
{
|
|
struct ceph_pool_perm *perm;
|
|
struct rb_node *n;
|
|
|
|
while (!RB_EMPTY_ROOT(&mdsc->pool_perm_tree)) {
|
|
n = rb_first(&mdsc->pool_perm_tree);
|
|
perm = rb_entry(n, struct ceph_pool_perm, node);
|
|
rb_erase(n, &mdsc->pool_perm_tree);
|
|
kfree(perm);
|
|
}
|
|
}
|