diff options
Diffstat (limited to 'fs/ceph/addr.c')
| -rw-r--r-- | fs/ceph/addr.c | 2229 |
1 files changed, 2229 insertions, 0 deletions
diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c new file mode 100644 index 0000000000..f4863078f7 --- /dev/null +++ b/fs/ceph/addr.c @@ -0,0 +1,2229 @@ +// 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 "crypto.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 inode *inode = req->r_inode; + struct ceph_fs_client *fsc = ceph_inode_to_client(inode); + struct ceph_osd_data *osd_data = osd_req_op_extent_osd_data(req, 0); + struct netfs_io_subrequest *subreq = req->r_priv; + struct ceph_osd_req_op *op = &req->r_ops[0]; + int err = req->r_result; + bool sparse = (op->op == CEPH_OSD_OP_SPARSE_READ); + + 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) { + if (sparse && err > 0) + err = ceph_sparse_ext_map_end(op); + if (err < subreq->len) + __set_bit(NETFS_SREQ_CLEAR_TAIL, &subreq->flags); + if (IS_ENCRYPTED(inode) && err > 0) { + err = ceph_fscrypt_decrypt_extents(inode, + osd_data->pages, subreq->start, + op->extent.sparse_ext, + op->extent.sparse_ext_cnt); + if (err > subreq->len) + err = subreq->len; + } + } + + if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGES) { + ceph_put_page_vector(osd_data->pages, + calc_pages_for(osd_data->alignment, + osd_data->length), false); + } + netfs_subreq_terminated(subreq, err, false); + iput(req->r_inode); + ceph_dec_osd_stopping_blocker(fsc->mdsc); +} + +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; + int err = 0; + u64 len = subreq->len; + bool sparse = IS_ENCRYPTED(inode) || ceph_test_mount_opt(fsc, SPARSEREAD); + u64 off = subreq->start; + + if (ceph_inode_is_shutdown(inode)) { + err = -EIO; + goto out; + } + + if (ceph_has_inline_data(ci) && ceph_netfs_issue_op_inline(subreq)) + return; + + ceph_fscrypt_adjust_off_and_len(inode, &off, &len); + + req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, vino, + off, &len, 0, 1, sparse ? CEPH_OSD_OP_SPARSE_READ : CEPH_OSD_OP_READ, + CEPH_OSD_FLAG_READ | fsc->client->osdc.client->options->read_from_replica, + NULL, ci->i_truncate_seq, ci->i_truncate_size, false); + if (IS_ERR(req)) { + err = PTR_ERR(req); + req = NULL; + goto out; + } + + if (sparse) { + err = ceph_alloc_sparse_ext_map(&req->r_ops[0]); + if (err) + 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); + + /* + * FIXME: For now, use CEPH_OSD_DATA_TYPE_PAGES instead of _ITER for + * encrypted inodes. We'd need infrastructure that handles an iov_iter + * instead of page arrays, and we don't have that as of yet. Once the + * dust settles on the write helpers and encrypt/decrypt routines for + * netfs, we should be able to rework this. + */ + if (IS_ENCRYPTED(inode)) { + struct page **pages; + size_t page_off; + + err = iov_iter_get_pages_alloc2(&iter, &pages, len, &page_off); + if (err < 0) { + dout("%s: iov_ter_get_pages_alloc returned %d\n", + __func__, err); + goto out; + } + + /* should always give us a page-aligned read */ + WARN_ON_ONCE(page_off); + len = err; + err = 0; + + osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0, false, + false); + } else { + osd_req_op_extent_osd_iter(req, 0, &iter); + } + if (!ceph_inc_osd_stopping_blocker(fsc->mdsc)) { + err = -EIO; + goto out; + } + 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; + struct ceph_cap_snap *capsnap = NULL; + u64 end = i_size_read(inode); + u64 ret; + + snapc = page_snap_context(ceph_fscrypt_pagecache_page(page)); + 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 > ceph_fscrypt_page_offset(page) + thp_size(page)) + end = ceph_fscrypt_page_offset(page) + thp_size(page); + ret = end > start ? end - start : 0; + if (ret && fscrypt_is_bounce_page(page)) + ret = round_up(ret, CEPH_FSCRYPT_BLOCK_SIZE); + return ret; +} + +/* + * 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); + loff_t wlen; + 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); + struct page *bounce_page = NULL; + + 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; + + wlen = IS_ENCRYPTED(inode) ? round_up(len, CEPH_FSCRYPT_BLOCK_SIZE) : len; + dout("writepage %p page %p index %lu on %llu~%llu snapc %p seq %lld\n", + inode, page, page->index, page_off, wlen, 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, &wlen, 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); + } + + if (wlen < len) + len = wlen; + + set_page_writeback(page); + if (caching) + ceph_set_page_fscache(page); + ceph_fscache_write_to_cache(inode, page_off, len, caching); + + if (IS_ENCRYPTED(inode)) { + bounce_page = fscrypt_encrypt_pagecache_blocks(page, + CEPH_FSCRYPT_BLOCK_SIZE, 0, + GFP_NOFS); + if (IS_ERR(bounce_page)) { + redirty_page_for_writepage(wbc, page); + end_page_writeback(page); + ceph_osdc_put_request(req); + return PTR_ERR(bounce_page); + } + } + + /* 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, + bounce_page ? &bounce_page : &page, wlen, 0, + false, false); + dout("writepage %llu~%llu (%llu bytes, %sencrypted)\n", + page_off, len, wlen, IS_ENCRYPTED(inode) ? "" : "not "); + + 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); + fscrypt_free_bounce_page(bounce_page); + 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]; + if (fscrypt_is_bounce_page(page)) { + page = fscrypt_pagecache_page(page); + fscrypt_free_bounce_page(osd_data->pages[j]); + osd_data->pages[j] = page; + } + 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); + ceph_dec_osd_stopping_blocker(fsc->mdsc); +} + +/* + * 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 folio_batch fbatch; + 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); + xa_mark_t tag; + + 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; + + folio_batch_init(&fbatch); + + start_index = wbc->range_cyclic ? mapping->writeback_index : 0; + index = start_index; + + if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages) { + tag = PAGECACHE_TAG_TOWRITE; + } else { + tag = PAGECACHE_TAG_DIRTY; + } +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"); + } + + if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages) + tag_pages_for_writeback(mapping, index, end); + + ceph_put_snap_context(last_snapc); + last_snapc = snapc; + + while (!done && index <= end) { + int num_ops = 0, op_idx; + unsigned i, nr_folios, 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: + nr_folios = filemap_get_folios_tag(mapping, &index, + end, tag, &fbatch); + dout("pagevec_lookup_range_tag got %d\n", nr_folios); + if (!nr_folios && !locked_pages) + break; + for (i = 0; i < nr_folios && locked_pages < max_pages; i++) { + page = &fbatch.folios[i]->page; + 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 fbatch */ + 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; + + if (IS_ENCRYPTED(inode)) { + pages[locked_pages] = + fscrypt_encrypt_pagecache_blocks(page, + PAGE_SIZE, 0, + locked_pages ? GFP_NOWAIT : GFP_NOFS); + if (IS_ERR(pages[locked_pages])) { + if (PTR_ERR(pages[locked_pages]) == -EINVAL) + pr_err("%s: inode->i_blkbits=%hhu\n", + __func__, inode->i_blkbits); + /* better not fail on first page! */ + BUG_ON(locked_pages == 0); + pages[locked_pages] = NULL; + redirty_page_for_writepage(wbc, page); + unlock_page(page); + break; + } + ++locked_pages; + } else { + pages[locked_pages++] = page; + } + + fbatch.folios[i] = NULL; + len += thp_size(page); + } + + /* did we get anything? */ + if (!locked_pages) + goto release_folios; + if (i) { + unsigned j, n = 0; + /* shift unused page to beginning of fbatch */ + for (j = 0; j < nr_folios; j++) { + if (!fbatch.folios[j]) + continue; + if (n < j) + fbatch.folios[n] = fbatch.folios[j]; + n++; + } + fbatch.nr = n; + + if (nr_folios && i == nr_folios && + locked_pages < max_pages) { + dout("reached end fbatch, trying for more\n"); + folio_batch_release(&fbatch); + goto get_more_pages; + } + } + +new_request: + offset = ceph_fscrypt_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 < ceph_fscrypt_page_offset(pages[locked_pages - 1]) + + thp_size(pages[locked_pages - 1]) - offset); + + if (!ceph_inc_osd_stopping_blocker(fsc->mdsc)) { + rc = -EIO; + goto release_folios; + } + 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++) { + struct page *page = ceph_fscrypt_pagecache_page(pages[i]); + + u64 cur_offset = page_offset(page); + /* + * 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(page); + if (caching) + ceph_set_page_fscache(page); + 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); + } + if (IS_ENCRYPTED(inode)) + len = round_up(len, CEPH_FSCRYPT_BLOCK_SIZE); + + dout("writepages got pages at %llu~%llu\n", offset, len); + + if (IS_ENCRYPTED(inode) && + ((offset | len) & ~CEPH_FSCRYPT_BLOCK_MASK)) + pr_warn("%s: bad encrypted write offset=%lld len=%llu\n", + __func__, 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_folios: + dout("folio_batch release on %d folios (%p)\n", (int)fbatch.nr, + fbatch.nr ? fbatch.folios[0] : NULL); + folio_batch_release(&fbatch); + } + + 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 = filemap_get_folios_tag(mapping, &index, + (pgoff_t)-1, + PAGECACHE_TAG_WRITEBACK, + &fbatch))) { + for (i = 0; i < nr; i++) { + page = &fbatch.folios[i]->page; + if (page_snap_context(page) != snapc) + continue; + wait_on_page_writeback(page); + } + folio_batch_release(&fbatch); + 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); + + 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); + } +} |