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-rw-r--r--fs/ceph/addr.c2104
1 files changed, 2104 insertions, 0 deletions
diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c
new file mode 100644
index 000000000..dd2ce7fab
--- /dev/null
+++ b/fs/ceph/addr.c
@@ -0,0 +1,2104 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/ceph/ceph_debug.h>
+
+#include <linux/backing-dev.h>
+#include <linux/fs.h>
+#include <linux/mm.h>
+#include <linux/swap.h>
+#include <linux/pagemap.h>
+#include <linux/slab.h>
+#include <linux/pagevec.h>
+#include <linux/task_io_accounting_ops.h>
+#include <linux/signal.h>
+#include <linux/iversion.h>
+#include <linux/ktime.h>
+#include <linux/netfs.h>
+
+#include "super.h"
+#include "mds_client.h"
+#include "cache.h"
+#include "metric.h"
+#include <linux/ceph/osd_client.h>
+#include <linux/ceph/striper.h>
+
+/*
+ * Ceph address space ops.
+ *
+ * There are a few funny things going on here.
+ *
+ * The page->private field is used to reference a struct
+ * ceph_snap_context for _every_ dirty page. This indicates which
+ * snapshot the page was logically dirtied in, and thus which snap
+ * context needs to be associated with the osd write during writeback.
+ *
+ * Similarly, struct ceph_inode_info maintains a set of counters to
+ * count dirty pages on the inode. In the absence of snapshots,
+ * i_wrbuffer_ref == i_wrbuffer_ref_head == the dirty page count.
+ *
+ * When a snapshot is taken (that is, when the client receives
+ * notification that a snapshot was taken), each inode with caps and
+ * with dirty pages (dirty pages implies there is a cap) gets a new
+ * ceph_cap_snap in the i_cap_snaps list (which is sorted in ascending
+ * order, new snaps go to the tail). The i_wrbuffer_ref_head count is
+ * moved to capsnap->dirty. (Unless a sync write is currently in
+ * progress. In that case, the capsnap is said to be "pending", new
+ * writes cannot start, and the capsnap isn't "finalized" until the
+ * write completes (or fails) and a final size/mtime for the inode for
+ * that snap can be settled upon.) i_wrbuffer_ref_head is reset to 0.
+ *
+ * On writeback, we must submit writes to the osd IN SNAP ORDER. So,
+ * we look for the first capsnap in i_cap_snaps and write out pages in
+ * that snap context _only_. Then we move on to the next capsnap,
+ * eventually reaching the "live" or "head" context (i.e., pages that
+ * are not yet snapped) and are writing the most recently dirtied
+ * pages.
+ *
+ * Invalidate and so forth must take care to ensure the dirty page
+ * accounting is preserved.
+ */
+
+#define CONGESTION_ON_THRESH(congestion_kb) (congestion_kb >> (PAGE_SHIFT-10))
+#define CONGESTION_OFF_THRESH(congestion_kb) \
+ (CONGESTION_ON_THRESH(congestion_kb) - \
+ (CONGESTION_ON_THRESH(congestion_kb) >> 2))
+
+static int ceph_netfs_check_write_begin(struct file *file, loff_t pos, unsigned int len,
+ struct folio **foliop, void **_fsdata);
+
+static inline struct ceph_snap_context *page_snap_context(struct page *page)
+{
+ if (PagePrivate(page))
+ return (void *)page->private;
+ return NULL;
+}
+
+/*
+ * Dirty a page. Optimistically adjust accounting, on the assumption
+ * that we won't race with invalidate. If we do, readjust.
+ */
+static bool ceph_dirty_folio(struct address_space *mapping, struct folio *folio)
+{
+ struct inode *inode;
+ struct ceph_inode_info *ci;
+ struct ceph_snap_context *snapc;
+
+ if (folio_test_dirty(folio)) {
+ dout("%p dirty_folio %p idx %lu -- already dirty\n",
+ mapping->host, folio, folio->index);
+ VM_BUG_ON_FOLIO(!folio_test_private(folio), folio);
+ return false;
+ }
+
+ inode = mapping->host;
+ ci = ceph_inode(inode);
+
+ /* dirty the head */
+ spin_lock(&ci->i_ceph_lock);
+ BUG_ON(ci->i_wr_ref == 0); // caller should hold Fw reference
+ if (__ceph_have_pending_cap_snap(ci)) {
+ struct ceph_cap_snap *capsnap =
+ list_last_entry(&ci->i_cap_snaps,
+ struct ceph_cap_snap,
+ ci_item);
+ snapc = ceph_get_snap_context(capsnap->context);
+ capsnap->dirty_pages++;
+ } else {
+ BUG_ON(!ci->i_head_snapc);
+ snapc = ceph_get_snap_context(ci->i_head_snapc);
+ ++ci->i_wrbuffer_ref_head;
+ }
+ if (ci->i_wrbuffer_ref == 0)
+ ihold(inode);
+ ++ci->i_wrbuffer_ref;
+ dout("%p dirty_folio %p idx %lu head %d/%d -> %d/%d "
+ "snapc %p seq %lld (%d snaps)\n",
+ mapping->host, folio, folio->index,
+ ci->i_wrbuffer_ref-1, ci->i_wrbuffer_ref_head-1,
+ ci->i_wrbuffer_ref, ci->i_wrbuffer_ref_head,
+ snapc, snapc->seq, snapc->num_snaps);
+ spin_unlock(&ci->i_ceph_lock);
+
+ /*
+ * Reference snap context in folio->private. Also set
+ * PagePrivate so that we get invalidate_folio callback.
+ */
+ VM_WARN_ON_FOLIO(folio->private, folio);
+ folio_attach_private(folio, snapc);
+
+ return ceph_fscache_dirty_folio(mapping, folio);
+}
+
+/*
+ * If we are truncating the full folio (i.e. offset == 0), adjust the
+ * dirty folio counters appropriately. Only called if there is private
+ * data on the folio.
+ */
+static void ceph_invalidate_folio(struct folio *folio, size_t offset,
+ size_t length)
+{
+ struct inode *inode;
+ struct ceph_inode_info *ci;
+ struct ceph_snap_context *snapc;
+
+ inode = folio->mapping->host;
+ ci = ceph_inode(inode);
+
+ if (offset != 0 || length != folio_size(folio)) {
+ dout("%p invalidate_folio idx %lu partial dirty page %zu~%zu\n",
+ inode, folio->index, offset, length);
+ return;
+ }
+
+ WARN_ON(!folio_test_locked(folio));
+ if (folio_test_private(folio)) {
+ dout("%p invalidate_folio idx %lu full dirty page\n",
+ inode, folio->index);
+
+ snapc = folio_detach_private(folio);
+ ceph_put_wrbuffer_cap_refs(ci, 1, snapc);
+ ceph_put_snap_context(snapc);
+ }
+
+ folio_wait_fscache(folio);
+}
+
+static bool ceph_release_folio(struct folio *folio, gfp_t gfp)
+{
+ struct inode *inode = folio->mapping->host;
+
+ dout("%llx:%llx release_folio idx %lu (%sdirty)\n",
+ ceph_vinop(inode),
+ folio->index, folio_test_dirty(folio) ? "" : "not ");
+
+ if (folio_test_private(folio))
+ return false;
+
+ if (folio_test_fscache(folio)) {
+ if (current_is_kswapd() || !(gfp & __GFP_FS))
+ return false;
+ folio_wait_fscache(folio);
+ }
+ ceph_fscache_note_page_release(inode);
+ return true;
+}
+
+static void ceph_netfs_expand_readahead(struct netfs_io_request *rreq)
+{
+ struct inode *inode = rreq->inode;
+ struct ceph_inode_info *ci = ceph_inode(inode);
+ struct ceph_file_layout *lo = &ci->i_layout;
+ unsigned long max_pages = inode->i_sb->s_bdi->ra_pages;
+ loff_t end = rreq->start + rreq->len, new_end;
+ struct ceph_netfs_request_data *priv = rreq->netfs_priv;
+ unsigned long max_len;
+ u32 blockoff;
+
+ if (priv) {
+ /* Readahead is disabled by posix_fadvise POSIX_FADV_RANDOM */
+ if (priv->file_ra_disabled)
+ max_pages = 0;
+ else
+ max_pages = priv->file_ra_pages;
+
+ }
+
+ /* Readahead is disabled */
+ if (!max_pages)
+ return;
+
+ max_len = max_pages << PAGE_SHIFT;
+
+ /*
+ * Try to expand the length forward by rounding up it to the next
+ * block, but do not exceed the file size, unless the original
+ * request already exceeds it.
+ */
+ new_end = min(round_up(end, lo->stripe_unit), rreq->i_size);
+ if (new_end > end && new_end <= rreq->start + max_len)
+ rreq->len = new_end - rreq->start;
+
+ /* Try to expand the start downward */
+ div_u64_rem(rreq->start, lo->stripe_unit, &blockoff);
+ if (rreq->len + blockoff <= max_len) {
+ rreq->start -= blockoff;
+ rreq->len += blockoff;
+ }
+}
+
+static bool ceph_netfs_clamp_length(struct netfs_io_subrequest *subreq)
+{
+ struct inode *inode = subreq->rreq->inode;
+ struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
+ struct ceph_inode_info *ci = ceph_inode(inode);
+ u64 objno, objoff;
+ u32 xlen;
+
+ /* Truncate the extent at the end of the current block */
+ ceph_calc_file_object_mapping(&ci->i_layout, subreq->start, subreq->len,
+ &objno, &objoff, &xlen);
+ subreq->len = min(xlen, fsc->mount_options->rsize);
+ return true;
+}
+
+static void finish_netfs_read(struct ceph_osd_request *req)
+{
+ struct ceph_fs_client *fsc = ceph_inode_to_client(req->r_inode);
+ struct ceph_osd_data *osd_data = osd_req_op_extent_osd_data(req, 0);
+ struct netfs_io_subrequest *subreq = req->r_priv;
+ int num_pages;
+ int err = req->r_result;
+
+ ceph_update_read_metrics(&fsc->mdsc->metric, req->r_start_latency,
+ req->r_end_latency, osd_data->length, err);
+
+ dout("%s: result %d subreq->len=%zu i_size=%lld\n", __func__, req->r_result,
+ subreq->len, i_size_read(req->r_inode));
+
+ /* no object means success but no data */
+ if (err == -ENOENT)
+ err = 0;
+ else if (err == -EBLOCKLISTED)
+ fsc->blocklisted = true;
+
+ if (err >= 0 && err < subreq->len)
+ __set_bit(NETFS_SREQ_CLEAR_TAIL, &subreq->flags);
+
+ netfs_subreq_terminated(subreq, err, false);
+
+ num_pages = calc_pages_for(osd_data->alignment, osd_data->length);
+ ceph_put_page_vector(osd_data->pages, num_pages, false);
+ iput(req->r_inode);
+}
+
+static bool ceph_netfs_issue_op_inline(struct netfs_io_subrequest *subreq)
+{
+ struct netfs_io_request *rreq = subreq->rreq;
+ struct inode *inode = rreq->inode;
+ struct ceph_mds_reply_info_parsed *rinfo;
+ struct ceph_mds_reply_info_in *iinfo;
+ struct ceph_mds_request *req;
+ struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb);
+ struct ceph_inode_info *ci = ceph_inode(inode);
+ struct iov_iter iter;
+ ssize_t err = 0;
+ size_t len;
+ int mode;
+
+ __set_bit(NETFS_SREQ_CLEAR_TAIL, &subreq->flags);
+ __clear_bit(NETFS_SREQ_COPY_TO_CACHE, &subreq->flags);
+
+ if (subreq->start >= inode->i_size)
+ goto out;
+
+ /* We need to fetch the inline data. */
+ mode = ceph_try_to_choose_auth_mds(inode, CEPH_STAT_CAP_INLINE_DATA);
+ req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, mode);
+ if (IS_ERR(req)) {
+ err = PTR_ERR(req);
+ goto out;
+ }
+ req->r_ino1 = ci->i_vino;
+ req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INLINE_DATA);
+ req->r_num_caps = 2;
+
+ err = ceph_mdsc_do_request(mdsc, NULL, req);
+ if (err < 0)
+ goto out;
+
+ rinfo = &req->r_reply_info;
+ iinfo = &rinfo->targeti;
+ if (iinfo->inline_version == CEPH_INLINE_NONE) {
+ /* The data got uninlined */
+ ceph_mdsc_put_request(req);
+ return false;
+ }
+
+ len = min_t(size_t, iinfo->inline_len - subreq->start, subreq->len);
+ iov_iter_xarray(&iter, ITER_DEST, &rreq->mapping->i_pages, subreq->start, len);
+ err = copy_to_iter(iinfo->inline_data + subreq->start, len, &iter);
+ if (err == 0)
+ err = -EFAULT;
+
+ ceph_mdsc_put_request(req);
+out:
+ netfs_subreq_terminated(subreq, err, false);
+ return true;
+}
+
+static void ceph_netfs_issue_read(struct netfs_io_subrequest *subreq)
+{
+ struct netfs_io_request *rreq = subreq->rreq;
+ struct inode *inode = rreq->inode;
+ struct ceph_inode_info *ci = ceph_inode(inode);
+ struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
+ struct ceph_osd_request *req = NULL;
+ struct ceph_vino vino = ceph_vino(inode);
+ struct iov_iter iter;
+ struct page **pages;
+ size_t page_off;
+ int err = 0;
+ u64 len = subreq->len;
+
+ if (ceph_inode_is_shutdown(inode)) {
+ err = -EIO;
+ goto out;
+ }
+
+ if (ceph_has_inline_data(ci) && ceph_netfs_issue_op_inline(subreq))
+ return;
+
+ req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, vino, subreq->start, &len,
+ 0, 1, CEPH_OSD_OP_READ,
+ CEPH_OSD_FLAG_READ | fsc->client->osdc.client->options->read_from_replica,
+ NULL, ci->i_truncate_seq, ci->i_truncate_size, false);
+ if (IS_ERR(req)) {
+ err = PTR_ERR(req);
+ req = NULL;
+ goto out;
+ }
+
+ dout("%s: pos=%llu orig_len=%zu len=%llu\n", __func__, subreq->start, subreq->len, len);
+ iov_iter_xarray(&iter, ITER_DEST, &rreq->mapping->i_pages, subreq->start, len);
+ err = iov_iter_get_pages_alloc2(&iter, &pages, len, &page_off);
+ if (err < 0) {
+ dout("%s: iov_ter_get_pages_alloc returned %d\n", __func__, err);
+ goto out;
+ }
+
+ /* should always give us a page-aligned read */
+ WARN_ON_ONCE(page_off);
+ len = err;
+ err = 0;
+
+ osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0, false, false);
+ req->r_callback = finish_netfs_read;
+ req->r_priv = subreq;
+ req->r_inode = inode;
+ ihold(inode);
+
+ ceph_osdc_start_request(req->r_osdc, req);
+out:
+ ceph_osdc_put_request(req);
+ if (err)
+ netfs_subreq_terminated(subreq, err, false);
+ dout("%s: result %d\n", __func__, err);
+}
+
+static int ceph_init_request(struct netfs_io_request *rreq, struct file *file)
+{
+ struct inode *inode = rreq->inode;
+ int got = 0, want = CEPH_CAP_FILE_CACHE;
+ struct ceph_netfs_request_data *priv;
+ int ret = 0;
+
+ if (rreq->origin != NETFS_READAHEAD)
+ return 0;
+
+ priv = kzalloc(sizeof(*priv), GFP_NOFS);
+ if (!priv)
+ return -ENOMEM;
+
+ if (file) {
+ struct ceph_rw_context *rw_ctx;
+ struct ceph_file_info *fi = file->private_data;
+
+ priv->file_ra_pages = file->f_ra.ra_pages;
+ priv->file_ra_disabled = file->f_mode & FMODE_RANDOM;
+
+ rw_ctx = ceph_find_rw_context(fi);
+ if (rw_ctx) {
+ rreq->netfs_priv = priv;
+ return 0;
+ }
+ }
+
+ /*
+ * readahead callers do not necessarily hold Fcb caps
+ * (e.g. fadvise, madvise).
+ */
+ ret = ceph_try_get_caps(inode, CEPH_CAP_FILE_RD, want, true, &got);
+ if (ret < 0) {
+ dout("start_read %p, error getting cap\n", inode);
+ goto out;
+ }
+
+ if (!(got & want)) {
+ dout("start_read %p, no cache cap\n", inode);
+ ret = -EACCES;
+ goto out;
+ }
+ if (ret == 0) {
+ ret = -EACCES;
+ goto out;
+ }
+
+ priv->caps = got;
+ rreq->netfs_priv = priv;
+
+out:
+ if (ret < 0)
+ kfree(priv);
+
+ return ret;
+}
+
+static void ceph_netfs_free_request(struct netfs_io_request *rreq)
+{
+ struct ceph_netfs_request_data *priv = rreq->netfs_priv;
+
+ if (!priv)
+ return;
+
+ if (priv->caps)
+ ceph_put_cap_refs(ceph_inode(rreq->inode), priv->caps);
+ kfree(priv);
+ rreq->netfs_priv = NULL;
+}
+
+const struct netfs_request_ops ceph_netfs_ops = {
+ .init_request = ceph_init_request,
+ .free_request = ceph_netfs_free_request,
+ .begin_cache_operation = ceph_begin_cache_operation,
+ .issue_read = ceph_netfs_issue_read,
+ .expand_readahead = ceph_netfs_expand_readahead,
+ .clamp_length = ceph_netfs_clamp_length,
+ .check_write_begin = ceph_netfs_check_write_begin,
+};
+
+#ifdef CONFIG_CEPH_FSCACHE
+static void ceph_set_page_fscache(struct page *page)
+{
+ set_page_fscache(page);
+}
+
+static void ceph_fscache_write_terminated(void *priv, ssize_t error, bool was_async)
+{
+ struct inode *inode = priv;
+
+ if (IS_ERR_VALUE(error) && error != -ENOBUFS)
+ ceph_fscache_invalidate(inode, false);
+}
+
+static void ceph_fscache_write_to_cache(struct inode *inode, u64 off, u64 len, bool caching)
+{
+ struct ceph_inode_info *ci = ceph_inode(inode);
+ struct fscache_cookie *cookie = ceph_fscache_cookie(ci);
+
+ fscache_write_to_cache(cookie, inode->i_mapping, off, len, i_size_read(inode),
+ ceph_fscache_write_terminated, inode, caching);
+}
+#else
+static inline void ceph_set_page_fscache(struct page *page)
+{
+}
+
+static inline void ceph_fscache_write_to_cache(struct inode *inode, u64 off, u64 len, bool caching)
+{
+}
+#endif /* CONFIG_CEPH_FSCACHE */
+
+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) + thp_size(page))
+ end = page_offset(page) + thp_size(page);
+ 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 folio *folio = page_folio(page);
+ 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 = thp_size(page);
+ struct ceph_writeback_ctl ceph_wbc;
+ struct ceph_osd_client *osdc = &fsc->client->osdc;
+ struct ceph_osd_request *req;
+ bool caching = ceph_is_cache_enabled(inode);
+
+ dout("writepage %p idx %lu\n", page, page->index);
+
+ if (ceph_inode_is_shutdown(inode))
+ return -EIO;
+
+ /* 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("folio at %lu beyond eof %llu\n", folio->index,
+ ceph_wbc.i_size);
+ folio_invalidate(folio, 0, folio_size(folio));
+ 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))
+ fsc->write_congested = true;
+
+ 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);
+ return PTR_ERR(req);
+ }
+
+ set_page_writeback(page);
+ if (caching)
+ ceph_set_page_fscache(page);
+ ceph_fscache_write_to_cache(inode, page_off, len, caching);
+
+ /* it may be a short write due to an object boundary */
+ WARN_ON_ONCE(len > thp_size(page));
+ 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;
+ ceph_osdc_start_request(osdc, req);
+ err = ceph_osdc_wait_request(osdc, req);
+
+ ceph_update_write_metrics(&fsc->mdsc->metric, req->r_start_latency,
+ req->r_end_latency, len, 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 */
+ }
+ oldest = detach_page_private(page);
+ WARN_ON_ONCE(oldest != snapc);
+ 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))
+ fsc->write_congested = false;
+
+ 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);
+
+ if (wbc->sync_mode == WB_SYNC_NONE &&
+ ceph_inode_to_client(inode)->write_congested)
+ return AOP_WRITEPAGE_ACTIVATE;
+
+ wait_on_page_fscache(page);
+
+ 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);
+ unsigned int len = 0;
+ 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);
+ }
+
+ /*
+ * 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) {
+ pr_warn("%s incorrect op %d req %p index %d tid %llu\n",
+ __func__, req->r_ops[i].op, req, i, req->r_tid);
+ break;
+ }
+
+ osd_data = osd_req_op_extent_osd_data(req, i);
+ BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGES);
+ len += osd_data->length;
+ 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))
+ fsc->write_congested = false;
+
+ ceph_put_snap_context(detach_page_private(page));
+ end_page_writeback(page);
+ dout("unlocking %p\n", 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_update_write_metrics(&fsc->mdsc->metric, req->r_start_latency,
+ req->r_end_latency, len, rc);
+
+ 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;
+ bool caching = ceph_is_cache_enabled(inode);
+
+ if (wbc->sync_mode == WB_SYNC_NONE &&
+ fsc->write_congested)
+ return 0;
+
+ dout("writepages_start %p (mode=%s)\n", inode,
+ wbc->sync_mode == WB_SYNC_NONE ? "NONE" :
+ (wbc->sync_mode == WB_SYNC_ALL ? "ALL" : "HOLD"));
+
+ if (ceph_inode_is_shutdown(inode)) {
+ 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) {
+ struct folio *folio = page_folio(page);
+
+ dout("folio at %lu beyond eof %llu\n",
+ folio->index, ceph_wbc.i_size);
+ if ((ceph_wbc.size_stable ||
+ folio_pos(folio) >= i_size_read(inode)) &&
+ folio_clear_dirty_for_io(folio))
+ folio_invalidate(folio, 0,
+ folio_size(folio));
+ folio_unlock(folio);
+ 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) || PageFsCache(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);
+ wait_on_page_fscache(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))
+ fsc->write_congested = true;
+
+ pages[locked_pages++] = page;
+ pvec.pages[i] = NULL;
+
+ len += thp_size(page);
+ }
+
+ /* 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]) +
+ thp_size(page) - 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]);
+ /*
+ * Discontinuity in page range? Ceph can handle that by just passing
+ * multiple extents in the write op.
+ */
+ if (offset + len != cur_offset) {
+ /* If it's full, stop here */
+ if (op_idx + 1 == req->r_num_ops)
+ break;
+
+ /* Kick off an fscache write with what we have so far. */
+ ceph_fscache_write_to_cache(inode, offset, len, caching);
+
+ /* Start a new extent */
+ 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]);
+ if (caching)
+ ceph_set_page_fscache(pages[i]);
+ len += thp_size(page);
+ }
+ ceph_fscache_write_to_cache(inode, offset, len, caching);
+
+ 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 - thp_size(page);
+ 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;
+ ceph_osdc_start_request(&fsc->client->osdc, req);
+ 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_inode_info *ci = ceph_inode(inode);
+
+ if (ceph_inode_is_shutdown(inode)) {
+ dout(" page %p %llx:%llx is shutdown\n", page,
+ ceph_vinop(inode));
+ return ERR_PTR(-ESTALE);
+ }
+
+ 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;
+}
+
+static int ceph_netfs_check_write_begin(struct file *file, loff_t pos, unsigned int len,
+ struct folio **foliop, void **_fsdata)
+{
+ struct inode *inode = file_inode(file);
+ struct ceph_inode_info *ci = ceph_inode(inode);
+ struct ceph_snap_context *snapc;
+
+ snapc = ceph_find_incompatible(folio_page(*foliop, 0));
+ if (snapc) {
+ int r;
+
+ folio_unlock(*foliop);
+ folio_put(*foliop);
+ *foliop = NULL;
+ if (IS_ERR(snapc))
+ return PTR_ERR(snapc);
+
+ ceph_queue_writeback(inode);
+ r = wait_event_killable(ci->i_cap_wq,
+ context_is_writeable_or_written(inode, snapc));
+ ceph_put_snap_context(snapc);
+ return r == 0 ? -EAGAIN : r;
+ }
+ return 0;
+}
+
+/*
+ * 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,
+ struct page **pagep, void **fsdata)
+{
+ struct inode *inode = file_inode(file);
+ struct ceph_inode_info *ci = ceph_inode(inode);
+ struct folio *folio = NULL;
+ int r;
+
+ r = netfs_write_begin(&ci->netfs, file, inode->i_mapping, pos, len, &folio, NULL);
+ if (r < 0)
+ return r;
+
+ folio_wait_fscache(folio);
+ WARN_ON_ONCE(!folio_test_locked(folio));
+ *pagep = &folio->page;
+ return 0;
+}
+
+/*
+ * 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 *subpage, void *fsdata)
+{
+ struct folio *folio = page_folio(subpage);
+ struct inode *inode = file_inode(file);
+ bool check_cap = false;
+
+ dout("write_end file %p inode %p folio %p %d~%d (%d)\n", file,
+ inode, folio, (int)pos, (int)copied, (int)len);
+
+ if (!folio_test_uptodate(folio)) {
+ /* just return that nothing was copied on a short copy */
+ if (copied < len) {
+ copied = 0;
+ goto out;
+ }
+ folio_mark_uptodate(folio);
+ }
+
+ /* did file size increase? */
+ if (pos+copied > i_size_read(inode))
+ check_cap = ceph_inode_set_size(inode, pos+copied);
+
+ folio_mark_dirty(folio);
+
+out:
+ folio_unlock(folio);
+ folio_put(folio);
+
+ if (check_cap)
+ ceph_check_caps(ceph_inode(inode), CHECK_CAPS_AUTHONLY, NULL);
+
+ return copied;
+}
+
+const struct address_space_operations ceph_aops = {
+ .read_folio = netfs_read_folio,
+ .readahead = netfs_readahead,
+ .writepage = ceph_writepage,
+ .writepages = ceph_writepages_start,
+ .write_begin = ceph_write_begin,
+ .write_end = ceph_write_end,
+ .dirty_folio = ceph_dirty_folio,
+ .invalidate_folio = ceph_invalidate_folio,
+ .release_folio = ceph_release_folio,
+ .direct_IO = noop_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;
+ loff_t off = (loff_t)vmf->pgoff << PAGE_SHIFT;
+ int want, got, err;
+ sigset_t oldset;
+ vm_fault_t ret = VM_FAULT_SIGBUS;
+
+ if (ceph_inode_is_shutdown(inode))
+ return ret;
+
+ ceph_block_sigs(&oldset);
+
+ dout("filemap_fault %p %llx.%llx %llu trying to get caps\n",
+ inode, ceph_vinop(inode), off);
+ 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);
+ if (err < 0)
+ goto out_restore;
+
+ dout("filemap_fault %p %llu got cap refs on %s\n",
+ inode, off, ceph_cap_string(got));
+
+ if ((got & (CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO)) ||
+ !ceph_has_inline_data(ci)) {
+ 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 drop cap refs %s ret %x\n",
+ inode, off, ceph_cap_string(got), ret);
+ } else
+ err = -EAGAIN;
+
+ 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;
+
+ filemap_invalidate_lock_shared(mapping);
+ 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:
+ filemap_invalidate_unlock_shared(mapping);
+ dout("filemap_fault %p %llu read inline data ret %x\n",
+ inode, off, ret);
+ }
+out_restore:
+ ceph_restore_sigs(&oldset);
+ if (err < 0)
+ ret = vmf_error(err);
+
+ return ret;
+}
+
+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;
+
+ if (ceph_inode_is_shutdown(inode))
+ return ret;
+
+ prealloc_cf = ceph_alloc_cap_flush();
+ if (!prealloc_cf)
+ return VM_FAULT_OOM;
+
+ sb_start_pagefault(inode->i_sb);
+ ceph_block_sigs(&oldset);
+
+ if (off + thp_size(page) <= size)
+ len = thp_size(page);
+ else
+ len = offset_in_thp(page, size);
+
+ 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);
+ 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) {
+ int dirty;
+ spin_lock(&ci->i_ceph_lock);
+ 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 *file)
+{
+ struct inode *inode = file_inode(file);
+ struct ceph_inode_info *ci = ceph_inode(inode);
+ struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
+ struct ceph_osd_request *req = NULL;
+ struct ceph_cap_flush *prealloc_cf = NULL;
+ struct folio *folio = NULL;
+ u64 inline_version = CEPH_INLINE_NONE;
+ struct page *pages[1];
+ int err = 0;
+ u64 len;
+
+ 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 (ceph_inode_is_shutdown(inode)) {
+ err = -EIO;
+ goto out;
+ }
+
+ if (inline_version == CEPH_INLINE_NONE)
+ return 0;
+
+ prealloc_cf = ceph_alloc_cap_flush();
+ if (!prealloc_cf)
+ return -ENOMEM;
+
+ if (inline_version == 1) /* initial version, no data */
+ goto out_uninline;
+
+ folio = read_mapping_folio(inode->i_mapping, 0, file);
+ if (IS_ERR(folio)) {
+ err = PTR_ERR(folio);
+ goto out;
+ }
+
+ folio_lock(folio);
+
+ len = i_size_read(inode);
+ if (len > folio_size(folio))
+ len = folio_size(folio);
+
+ 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_unlock;
+ }
+
+ req->r_mtime = inode->i_mtime;
+ ceph_osdc_start_request(&fsc->client->osdc, req);
+ err = ceph_osdc_wait_request(&fsc->client->osdc, req);
+ ceph_osdc_put_request(req);
+ if (err < 0)
+ goto out_unlock;
+
+ 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_unlock;
+ }
+
+ pages[0] = folio_page(folio, 0);
+ osd_req_op_extent_osd_data_pages(req, 1, pages, 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_req;
+ }
+
+ {
+ 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;
+ }
+
+ req->r_mtime = inode->i_mtime;
+ ceph_osdc_start_request(&fsc->client->osdc, req);
+ err = ceph_osdc_wait_request(&fsc->client->osdc, req);
+
+ ceph_update_write_metrics(&fsc->mdsc->metric, req->r_start_latency,
+ req->r_end_latency, len, err);
+
+out_uninline:
+ if (!err) {
+ int dirty;
+
+ /* Set to CAP_INLINE_NONE and dirty the caps */
+ down_read(&fsc->mdsc->snap_rwsem);
+ 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);
+ up_read(&fsc->mdsc->snap_rwsem);
+ if (dirty)
+ __mark_inode_dirty(inode, dirty);
+ }
+out_put_req:
+ ceph_osdc_put_request(req);
+ if (err == -ECANCELED)
+ err = 0;
+out_unlock:
+ if (folio) {
+ folio_unlock(folio);
+ folio_put(folio);
+ }
+out:
+ ceph_free_cap_flush(prealloc_cf);
+ 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->read_folio)
+ return -ENOEXEC;
+ 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->netfs.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);
+ ceph_osdc_start_request(&fsc->client->osdc, rd_req);
+
+ wr_req->r_mtime = ci->netfs.inode.i_mtime;
+ ceph_osdc_start_request(&fsc->client->osdc, wr_req);
+
+ err = ceph_osdc_wait_request(&fsc->client->osdc, rd_req);
+ 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;
+
+ /* Only need to do this for regular files */
+ if (!S_ISREG(inode->i_mode))
+ return 0;
+
+ 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);
+ }
+}