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kernel/fs/ceph/addr.c

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// 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 <trace/events/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 = mapping->host;
struct ceph_client *cl = ceph_inode_to_client(inode);
struct ceph_inode_info *ci;
struct ceph_snap_context *snapc;
if (folio_test_dirty(folio)) {
doutc(cl, "%llx.%llx %p idx %lu -- already dirty\n",
ceph_vinop(inode), folio, folio->index);
VM_BUG_ON_FOLIO(!folio_test_private(folio), folio);
return false;
}
ci = ceph_inode(inode);
/* dirty the head */
spin_lock(&ci->i_ceph_lock);
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;
doutc(cl, "%llx.%llx %p idx %lu head %d/%d -> %d/%d "
"snapc %p seq %lld (%d snaps)\n",
ceph_vinop(inode), 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 = folio->mapping->host;
struct ceph_client *cl = ceph_inode_to_client(inode);
struct ceph_inode_info *ci = ceph_inode(inode);
struct ceph_snap_context *snapc;
if (offset != 0 || length != folio_size(folio)) {
doutc(cl, "%llx.%llx idx %lu partial dirty page %zu~%zu\n",
ceph_vinop(inode), folio->index, offset, length);
return;
}
WARN_ON(!folio_test_locked(folio));
if (folio_test_private(folio)) {
doutc(cl, "%llx.%llx idx %lu full dirty page\n",
ceph_vinop(inode), folio->index);
snapc = folio_detach_private(folio);
ceph_put_wrbuffer_cap_refs(ci, 1, snapc);
ceph_put_snap_context(snapc);
}
netfs_invalidate_folio(folio, offset, length);
}
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 = umin(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 void finish_netfs_read(struct ceph_osd_request *req)
{
struct inode *inode = req->r_inode;
struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
struct ceph_client *cl = fsc->client;
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);
doutc(cl, "result %d subreq->len=%zu i_size=%lld\n", 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 &&
subreq->rreq->origin != NETFS_DIO_READ)
__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);
}
if (err > 0) {
subreq->transferred = err;
err = 0;
}
trace_netfs_sreq(subreq, netfs_sreq_trace_io_progress);
netfs_read_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);
ssize_t err = 0;
size_t len;
int mode;
if (rreq->origin != NETFS_DIO_READ)
__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;
trace_netfs_sreq(subreq, netfs_sreq_trace_submit);
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);
err = copy_to_iter(iinfo->inline_data + subreq->start, len, &subreq->io_iter);
if (err == 0) {
err = -EFAULT;
} else {
subreq->transferred += err;
err = 0;
}
ceph_mdsc_put_request(req);
out:
netfs_read_subreq_terminated(subreq, err, false);
return true;
}
static int ceph_netfs_prepare_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_fs_client(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);
rreq->io_streams[0].sreq_max_len = umin(xlen, fsc->mount_options->rsize);
return 0;
}
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_fs_client(inode);
struct ceph_client *cl = fsc->client;
struct ceph_osd_request *req = NULL;
struct ceph_vino vino = ceph_vino(inode);
int err;
u64 len;
bool sparse = IS_ENCRYPTED(inode) || ceph_test_mount_opt(fsc, SPARSEREAD);
u64 off = subreq->start;
int extent_cnt;
if (ceph_inode_is_shutdown(inode)) {
err = -EIO;
goto out;
}
if (ceph_has_inline_data(ci) && ceph_netfs_issue_op_inline(subreq))
return;
// TODO: This rounding here is slightly dodgy. It *should* work, for
// now, as the cache only deals in blocks that are a multiple of
// PAGE_SIZE and fscrypt blocks are at most PAGE_SIZE. What needs to
// happen is for the fscrypt driving to be moved into netfslib and the
// data in the cache also to be stored encrypted.
len = subreq->len;
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, NULL, ci->i_truncate_seq,
ci->i_truncate_size, false);
if (IS_ERR(req)) {
err = PTR_ERR(req);
req = NULL;
goto out;
}
if (sparse) {
extent_cnt = __ceph_sparse_read_ext_count(inode, len);
err = ceph_alloc_sparse_ext_map(&req->r_ops[0], extent_cnt);
if (err)
goto out;
}
doutc(cl, "%llx.%llx pos=%llu orig_len=%zu len=%llu\n",
ceph_vinop(inode), subreq->start, subreq->len, 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(&subreq->io_iter, &pages, len, &page_off);
if (err < 0) {
doutc(cl, "%llx.%llx failed to allocate pages, %d\n",
ceph_vinop(inode), 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, &subreq->io_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);
trace_netfs_sreq(subreq, netfs_sreq_trace_submit);
ceph_osdc_start_request(req->r_osdc, req);
out:
ceph_osdc_put_request(req);
if (err)
netfs_read_subreq_terminated(subreq, err, false);
doutc(cl, "%llx.%llx result %d\n", ceph_vinop(inode), err);
}
static int ceph_init_request(struct netfs_io_request *rreq, struct file *file)
{
struct inode *inode = rreq->inode;
struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
struct ceph_client *cl = ceph_inode_to_client(inode);
int got = 0, want = CEPH_CAP_FILE_CACHE;
struct ceph_netfs_request_data *priv;
int ret = 0;
/* [DEPRECATED] Use PG_private_2 to mark folio being written to the cache. */
__set_bit(NETFS_RREQ_USE_PGPRIV2, &rreq->flags);
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) {
doutc(cl, "%llx.%llx, error getting cap\n", ceph_vinop(inode));
goto out;
}
if (!(got & want)) {
doutc(cl, "%llx.%llx, no cache cap\n", ceph_vinop(inode));
ret = -EACCES;
goto out;
}
if (ret == 0) {
ret = -EACCES;
goto out;
}
priv->caps = got;
rreq->netfs_priv = priv;
rreq->io_streams[0].sreq_max_len = fsc->mount_options->rsize;
out:
if (ret < 0) {
if (got)
ceph_put_cap_refs(ceph_inode(inode), got);
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,
.prepare_read = ceph_netfs_prepare_read,
.issue_read = ceph_netfs_issue_read,
.expand_readahead = ceph_netfs_expand_readahead,
.check_write_begin = ceph_netfs_check_write_begin,
};
#ifdef CONFIG_CEPH_FSCACHE
static void ceph_set_page_fscache(struct page *page)
{
folio_start_private_2(page_folio(page)); /* [DEPRECATED] */
}
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, true, 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_client *cl = ceph_inode_to_client(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) {
doutc(cl, " capsnap %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);
doutc(cl, " 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_fs_client(inode);
struct ceph_client *cl = fsc->client;
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;
doutc(cl, "%llx.%llx page %p idx %lu\n", ceph_vinop(inode), 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) {
doutc(cl, "%llx.%llx page %p not dirty?\n", ceph_vinop(inode),
page);
return 0;
}
oldest = get_oldest_context(inode, &ceph_wbc, snapc);
if (snapc->seq > oldest->seq) {
doutc(cl, "%llx.%llx page %p snapc %p not writeable - noop\n",
ceph_vinop(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) {
doutc(cl, "%llx.%llx folio at %lu beyond eof %llu\n",
ceph_vinop(inode), 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;
doutc(cl, "%llx.%llx page %p index %lu on %llu~%llu snapc %p seq %lld\n",
ceph_vinop(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);
doutc(cl, "%llx.%llx %llu~%llu (%llu bytes, %sencrypted)\n",
ceph_vinop(inode), page_off, len, wlen,
IS_ENCRYPTED(inode) ? "" : "not ");
req->r_mtime = inode_get_mtime(inode);
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 */
doutc(cl, "%llx.%llx interrupted page %p\n",
ceph_vinop(inode), page);
redirty_page_for_writepage(wbc, page);
end_page_writeback(page);
return err;
}
if (err == -EBLOCKLISTED)
fsc->blocklisted = true;
doutc(cl, "%llx.%llx setting page/mapping error %d %p\n",
ceph_vinop(inode), err, page);
mapping_set_error(&inode->i_data, err);
wbc->pages_skipped++;
} else {
doutc(cl, "%llx.%llx cleaned page %p\n",
ceph_vinop(inode), 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_fs_client(inode)->write_congested) {
redirty_page_for_writepage(wbc, page);
return AOP_WRITEPAGE_ACTIVATE;
}
folio_wait_private_2(page_folio(page)); /* [DEPRECATED] */
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_client *cl = ceph_inode_to_client(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_fs_client(inode);
unsigned int len = 0;
bool remove_page;
doutc(cl, "%llx.%llx rc %d\n", ceph_vinop(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_client(cl,
"%llx.%llx incorrect op %d req %p index %d tid %llu\n",
ceph_vinop(inode), 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);
doutc(cl, "unlocking %p\n", page);
if (remove_page)
generic_error_remove_folio(inode->i_mapping,
page_folio(page));
unlock_page(page);
}
doutc(cl, "%llx.%llx wrote %llu bytes cleaned %d pages\n",
ceph_vinop(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_fs_client(inode);
struct ceph_client *cl = fsc->client;
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;
doutc(cl, "%llx.%llx (mode=%s)\n", ceph_vinop(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_client(cl,
"%llx.%llx %lld forced umount\n",
ceph_vinop(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? */
doutc(cl, " no snap context with dirty data?\n");
goto out;
}
doutc(cl, " 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;
doutc(cl, " 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;
doutc(cl, " 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;
doutc(cl, " 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);
doutc(cl, "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;
doutc(cl, "? %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)) {
doutc(cl, "!dirty or !mapping %p\n", page);
unlock_page(page);
continue;
}
/* only if matching snap context */
pgsnapc = page_snap_context(page);
if (pgsnapc != snapc) {
doutc(cl, "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);
doutc(cl, "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)) {
doutc(cl, "end of strip unit %p\n", page);
unlock_page(page);
break;
}
if (PageWriteback(page) ||
PagePrivate2(page) /* [DEPRECATED] */) {
if (wbc->sync_mode == WB_SYNC_NONE) {
doutc(cl, "%p under writeback\n", page);
unlock_page(page);
continue;
}
doutc(cl, "waiting on writeback %p\n", page);
wait_on_page_writeback(page);
folio_wait_private_2(page_folio(page)); /* [DEPRECATED] */
}
if (!clear_page_dirty_for_io(page)) {
doutc(cl, "%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 */
doutc(cl, "%llx.%llx will write page %p idx %lu\n",
ceph_vinop(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_client(cl,
"inode->i_blkbits=%hhu\n",
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) {
doutc(cl, "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);
doutc(cl, "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);
doutc(cl, "got pages at %llu~%llu\n", offset, len);
if (IS_ENCRYPTED(inode) &&
((offset | len) & ~CEPH_FSCRYPT_BLOCK_MASK))
pr_warn_client(cl,
"bad encrypted write offset=%lld len=%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_get_mtime(inode);
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:
doutc(cl, "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 */
doutc(cl, "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);
doutc(cl, "%llx.%llx dend - startone, rc = %d\n", ceph_vinop(inode),
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_client *cl = ceph_inode_to_client(inode);
struct ceph_inode_info *ci = ceph_inode(inode);
if (ceph_inode_is_shutdown(inode)) {
doutc(cl, " %llx.%llx page %p is shutdown\n",
ceph_vinop(inode), page);
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);
doutc(cl, " %llx.%llx page %p snapc %p not current or oldest\n",
ceph_vinop(inode), page, snapc);
return ceph_get_snap_context(snapc);
}
ceph_put_snap_context(oldest);
/* yay, writeable, do it now (without dropping page lock) */
doutc(cl, " %llx.%llx page %p snapc %p not current, but oldest\n",
ceph_vinop(inode), 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 folio **foliop, void **fsdata)
{
struct inode *inode = file_inode(file);
struct ceph_inode_info *ci = ceph_inode(inode);
int r;
r = netfs_write_begin(&ci->netfs, file, inode->i_mapping, pos, len, foliop, NULL);
if (r < 0)
return r;
folio_wait_private_2(*foliop); /* [DEPRECATED] */
WARN_ON_ONCE(!folio_test_locked(*foliop));
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 folio *folio, void *fsdata)
{
struct inode *inode = file_inode(file);
struct ceph_client *cl = ceph_inode_to_client(inode);
bool check_cap = false;
doutc(cl, "%llx.%llx file %p folio %p %d~%d (%d)\n", ceph_vinop(inode),
file, 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 = netfs_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_client *cl = ceph_inode_to_client(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);
doutc(cl, "%llx.%llx %llu trying to get caps\n",
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;
doutc(cl, "%llx.%llx %llu got cap refs on %s\n", ceph_vinop(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);
doutc(cl, "%llx.%llx %llu drop cap refs %s ret %x\n",
ceph_vinop(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);
doutc(cl, "%llx.%llx %llu read inline data ret %x\n",
ceph_vinop(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_client *cl = ceph_inode_to_client(inode);
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);
doutc(cl, "%llx.%llx %llu~%zd getting caps i_size %llu\n",
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;
doutc(cl, "%llx.%llx %llu~%zd got cap refs on %s\n", ceph_vinop(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);
}
doutc(cl, "%llx.%llx %llu~%zd dropping cap refs on %s ret %x\n",
ceph_vinop(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 ceph_client *cl = ceph_inode_to_client(inode);
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;
}
}
doutc(cl, "%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_fs_client(inode);
struct ceph_client *cl = fsc->client;
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);
doutc(cl, "%llx.%llx inline_version %llu\n", 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_get_mtime(inode);
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_get_mtime(inode);
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);
doutc(cl, "%llx.%llx inline_version %llu = %d\n",
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_fs_client(&ci->netfs.inode);
struct ceph_mds_client *mdsc = fsc->mdsc;
struct ceph_client *cl = fsc->client;
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)
doutc(cl, "pool %lld ns %.*s no perm cached\n", pool,
(int)pool_ns->len, pool_ns->str);
else
doutc(cl, "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 = inode_get_mtime(&ci->netfs.inode);
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(struct_size(perm, pool_ns, 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)
doutc(cl, "pool %lld ns %.*s result = %d\n", pool,
(int)pool_ns->len, pool_ns->str, err);
else
doutc(cl, "pool %lld result = %d\n", pool, err);
return err;
}
int ceph_pool_perm_check(struct inode *inode, int need)
{
struct ceph_client *cl = ceph_inode_to_client(inode);
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_fs_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)) {
doutc(cl, "pool %lld no read perm\n", pool);
return -EPERM;
}
if ((need & CEPH_CAP_FILE_WR) && !(flags & CEPH_I_POOL_WR)) {
doutc(cl, "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);
}
}
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