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addr.c
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addr.c
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#include <linux/ceph/ceph_debug.h>
#include <linux/backing-dev.h>
#include <linux/fs.h>
#include <linux/mm.h>
#include <linux/pagemap.h>
#include <linux/writeback.h> /* generic_writepages */
#include <linux/slab.h>
#include <linux/pagevec.h>
#include <linux/task_io_accounting_ops.h>
#include <linux/signal.h>
#include "super.h"
#include "mds_client.h"
#include "cache.h"
#include <linux/ceph/osd_client.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 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 int ceph_set_page_dirty(struct page *page)
{
struct address_space *mapping = page->mapping;
struct inode *inode;
struct ceph_inode_info *ci;
struct ceph_snap_context *snapc;
int ret;
if (unlikely(!mapping))
return !TestSetPageDirty(page);
if (PageDirty(page)) {
dout("%p set_page_dirty %p idx %lu -- already dirty\n",
mapping->host, page, page->index);
BUG_ON(!PagePrivate(page));
return 0;
}
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 set_page_dirty %p idx %lu head %d/%d -> %d/%d "
"snapc %p seq %lld (%d snaps)\n",
mapping->host, page, page->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 page->private. Also set
* PagePrivate so that we get invalidatepage callback.
*/
BUG_ON(PagePrivate(page));
page->private = (unsigned long)snapc;
SetPagePrivate(page);
ret = __set_page_dirty_nobuffers(page);
WARN_ON(!PageLocked(page));
WARN_ON(!page->mapping);
return ret;
}
/*
* If we are truncating the full page (i.e. offset == 0), adjust the
* dirty page counters appropriately. Only called if there is private
* data on the page.
*/
static void ceph_invalidatepage(struct page *page, unsigned int offset,
unsigned int length)
{
struct inode *inode;
struct ceph_inode_info *ci;
struct ceph_snap_context *snapc = page_snap_context(page);
inode = page->mapping->host;
ci = ceph_inode(inode);
if (offset != 0 || length != PAGE_SIZE) {
dout("%p invalidatepage %p idx %lu partial dirty page %u~%u\n",
inode, page, page->index, offset, length);
return;
}
ceph_invalidate_fscache_page(inode, page);
if (!PagePrivate(page))
return;
/*
* We can get non-dirty pages here due to races between
* set_page_dirty and truncate_complete_page; just spit out a
* warning, in case we end up with accounting problems later.
*/
if (!PageDirty(page))
pr_err("%p invalidatepage %p page not dirty\n", inode, page);
ClearPageChecked(page);
dout("%p invalidatepage %p idx %lu full dirty page\n",
inode, page, page->index);
ceph_put_wrbuffer_cap_refs(ci, 1, snapc);
ceph_put_snap_context(snapc);
page->private = 0;
ClearPagePrivate(page);
}
static int ceph_releasepage(struct page *page, gfp_t g)
{
dout("%p releasepage %p idx %lu (%sdirty)\n", page->mapping->host,
page, page->index, PageDirty(page) ? "" : "not ");
/* Can we release the page from the cache? */
if (!ceph_release_fscache_page(page, g))
return 0;
return !PagePrivate(page);
}
/*
* read a single page, without unlocking it.
*/
static int readpage_nounlock(struct file *filp, struct page *page)
{
struct inode *inode = file_inode(filp);
struct ceph_inode_info *ci = ceph_inode(inode);
struct ceph_osd_client *osdc =
&ceph_inode_to_client(inode)->client->osdc;
int err = 0;
u64 off = page_offset(page);
u64 len = PAGE_SIZE;
if (off >= i_size_read(inode)) {
zero_user_segment(page, 0, PAGE_SIZE);
SetPageUptodate(page);
return 0;
}
if (ci->i_inline_version != CEPH_INLINE_NONE) {
/*
* Uptodate inline data should have been added
* into page cache while getting Fcr caps.
*/
if (off == 0)
return -EINVAL;
zero_user_segment(page, 0, PAGE_SIZE);
SetPageUptodate(page);
return 0;
}
err = ceph_readpage_from_fscache(inode, page);
if (err == 0)
goto out;
dout("readpage inode %p file %p page %p index %lu\n",
inode, filp, page, page->index);
err = ceph_osdc_readpages(osdc, ceph_vino(inode), &ci->i_layout,
off, &len,
ci->i_truncate_seq, ci->i_truncate_size,
&page, 1, 0);
if (err == -ENOENT)
err = 0;
if (err < 0) {
SetPageError(page);
ceph_fscache_readpage_cancel(inode, page);
goto out;
}
if (err < PAGE_SIZE)
/* zero fill remainder of page */
zero_user_segment(page, err, PAGE_SIZE);
else
flush_dcache_page(page);
SetPageUptodate(page);
ceph_readpage_to_fscache(inode, page);
out:
return err < 0 ? err : 0;
}
static int ceph_readpage(struct file *filp, struct page *page)
{
int r = readpage_nounlock(filp, page);
unlock_page(page);
return r;
}
/*
* Finish an async read(ahead) op.
*/
static void finish_read(struct ceph_osd_request *req)
{
struct inode *inode = req->r_inode;
struct ceph_osd_data *osd_data;
int rc = req->r_result <= 0 ? req->r_result : 0;
int bytes = req->r_result >= 0 ? req->r_result : 0;
int num_pages;
int i;
dout("finish_read %p req %p rc %d bytes %d\n", inode, req, rc, bytes);
/* unlock all pages, zeroing any data we didn't read */
osd_data = osd_req_op_extent_osd_data(req, 0);
BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGES);
num_pages = calc_pages_for((u64)osd_data->alignment,
(u64)osd_data->length);
for (i = 0; i < num_pages; i++) {
struct page *page = osd_data->pages[i];
if (rc < 0 && rc != -ENOENT) {
ceph_fscache_readpage_cancel(inode, page);
goto unlock;
}
if (bytes < (int)PAGE_SIZE) {
/* zero (remainder of) page */
int s = bytes < 0 ? 0 : bytes;
zero_user_segment(page, s, PAGE_SIZE);
}
dout("finish_read %p uptodate %p idx %lu\n", inode, page,
page->index);
flush_dcache_page(page);
SetPageUptodate(page);
ceph_readpage_to_fscache(inode, page);
unlock:
unlock_page(page);
put_page(page);
bytes -= PAGE_SIZE;
}
kfree(osd_data->pages);
}
/*
* start an async read(ahead) operation. return nr_pages we submitted
* a read for on success, or negative error code.
*/
static int start_read(struct inode *inode, struct list_head *page_list, int max)
{
struct ceph_osd_client *osdc =
&ceph_inode_to_client(inode)->client->osdc;
struct ceph_inode_info *ci = ceph_inode(inode);
struct page *page = list_entry(page_list->prev, struct page, lru);
struct ceph_vino vino;
struct ceph_osd_request *req;
u64 off;
u64 len;
int i;
struct page **pages;
pgoff_t next_index;
int nr_pages = 0;
int got = 0;
int ret = 0;
if (!current->journal_info) {
/* caller of readpages does not hold buffer and read caps
* (fadvise, madvise and readahead cases) */
int want = CEPH_CAP_FILE_CACHE;
ret = ceph_try_get_caps(ci, CEPH_CAP_FILE_RD, want, &got);
if (ret < 0) {
dout("start_read %p, error getting cap\n", inode);
} else if (!(got & want)) {
dout("start_read %p, no cache cap\n", inode);
ret = 0;
}
if (ret <= 0) {
if (got)
ceph_put_cap_refs(ci, got);
while (!list_empty(page_list)) {
page = list_entry(page_list->prev,
struct page, lru);
list_del(&page->lru);
put_page(page);
}
return ret;
}
}
off = (u64) page_offset(page);
/* count pages */
next_index = page->index;
list_for_each_entry_reverse(page, page_list, lru) {
if (page->index != next_index)
break;
nr_pages++;
next_index++;
if (max && nr_pages == max)
break;
}
len = nr_pages << PAGE_SHIFT;
dout("start_read %p nr_pages %d is %lld~%lld\n", inode, nr_pages,
off, len);
vino = ceph_vino(inode);
req = ceph_osdc_new_request(osdc, &ci->i_layout, vino, off, &len,
0, 1, CEPH_OSD_OP_READ,
CEPH_OSD_FLAG_READ, NULL,
ci->i_truncate_seq, ci->i_truncate_size,
false);
if (IS_ERR(req)) {
ret = PTR_ERR(req);
goto out;
}
/* build page vector */
nr_pages = calc_pages_for(0, len);
pages = kmalloc(sizeof(*pages) * nr_pages, GFP_KERNEL);
if (!pages) {
ret = -ENOMEM;
goto out_put;
}
for (i = 0; i < nr_pages; ++i) {
page = list_entry(page_list->prev, struct page, lru);
BUG_ON(PageLocked(page));
list_del(&page->lru);
dout("start_read %p adding %p idx %lu\n", inode, page,
page->index);
if (add_to_page_cache_lru(page, &inode->i_data, page->index,
GFP_KERNEL)) {
ceph_fscache_uncache_page(inode, page);
put_page(page);
dout("start_read %p add_to_page_cache failed %p\n",
inode, page);
nr_pages = i;
if (nr_pages > 0) {
len = nr_pages << PAGE_SHIFT;
osd_req_op_extent_update(req, 0, len);
break;
}
goto out_pages;
}
pages[i] = page;
}
osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0, false, false);
req->r_callback = finish_read;
req->r_inode = inode;
dout("start_read %p starting %p %lld~%lld\n", inode, req, off, len);
ret = ceph_osdc_start_request(osdc, req, false);
if (ret < 0)
goto out_pages;
ceph_osdc_put_request(req);
/* After adding locked pages to page cache, the inode holds cache cap.
* So we can drop our cap refs. */
if (got)
ceph_put_cap_refs(ci, got);
return nr_pages;
out_pages:
for (i = 0; i < nr_pages; ++i) {
ceph_fscache_readpage_cancel(inode, pages[i]);
unlock_page(pages[i]);
}
ceph_put_page_vector(pages, nr_pages, false);
out_put:
ceph_osdc_put_request(req);
out:
if (got)
ceph_put_cap_refs(ci, got);
return ret;
}
/*
* Read multiple pages. Leave pages we don't read + unlock in page_list;
* the caller (VM) cleans them up.
*/
static int ceph_readpages(struct file *file, struct address_space *mapping,
struct list_head *page_list, unsigned nr_pages)
{
struct inode *inode = file_inode(file);
struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
int rc = 0;
int max = 0;
if (ceph_inode(inode)->i_inline_version != CEPH_INLINE_NONE)
return -EINVAL;
rc = ceph_readpages_from_fscache(mapping->host, mapping, page_list,
&nr_pages);
if (rc == 0)
goto out;
if (fsc->mount_options->rsize >= PAGE_SIZE)
max = (fsc->mount_options->rsize + PAGE_SIZE - 1)
>> PAGE_SHIFT;
dout("readpages %p file %p nr_pages %d max %d\n", inode,
file, nr_pages,
max);
while (!list_empty(page_list)) {
rc = start_read(inode, page_list, max);
if (rc < 0)
goto out;
}
out:
ceph_fscache_readpages_cancel(inode, page_list);
dout("readpages %p file %p ret %d\n", inode, file, rc);
return rc;
}
/*
* 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,
loff_t *snap_size,
u64 *truncate_size,
u32 *truncate_seq)
{
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) {
snapc = ceph_get_snap_context(capsnap->context);
if (snap_size)
*snap_size = capsnap->size;
if (truncate_size)
*truncate_size = capsnap->truncate_size;
if (truncate_seq)
*truncate_seq = capsnap->truncate_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 (truncate_size)
*truncate_size = ci->i_truncate_size;
if (truncate_seq)
*truncate_seq = ci->i_truncate_seq;
}
spin_unlock(&ci->i_ceph_lock);
return snapc;
}
/*
* Write a single page, but leave the page locked.
*
* If we get a write error, set the page error bit, but still adjust the
* dirty page accounting (i.e., page is no longer dirty).
*/
static int writepage_nounlock(struct page *page, struct writeback_control *wbc)
{
struct inode *inode;
struct ceph_inode_info *ci;
struct ceph_fs_client *fsc;
struct ceph_osd_client *osdc;
struct ceph_snap_context *snapc, *oldest;
loff_t page_off = page_offset(page);
loff_t snap_size = -1;
long writeback_stat;
u64 truncate_size;
u32 truncate_seq;
int err = 0, len = PAGE_SIZE;
dout("writepage %p idx %lu\n", page, page->index);
if (!page->mapping || !page->mapping->host) {
dout("writepage %p - no mapping\n", page);
return -EFAULT;
}
inode = page->mapping->host;
ci = ceph_inode(inode);
fsc = ceph_inode_to_client(inode);
osdc = &fsc->client->osdc;
/* verify this is a writeable snap context */
snapc = page_snap_context(page);
if (snapc == NULL) {
dout("writepage %p page %p not dirty?\n", inode, page);
goto out;
}
oldest = get_oldest_context(inode, &snap_size,
&truncate_size, &truncate_seq);
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) == 0);
ceph_put_snap_context(oldest);
goto out;
}
ceph_put_snap_context(oldest);
if (snap_size == -1)
snap_size = i_size_read(inode);
/* is this a partial page at end of file? */
if (page_off >= snap_size) {
dout("%p page eof %llu\n", page, snap_size);
goto out;
}
if (snap_size < page_off + len)
len = snap_size - page_off;
dout("writepage %p page %p index %lu on %llu~%u snapc %p\n",
inode, page, page->index, page_off, len, snapc);
writeback_stat = atomic_long_inc_return(&fsc->writeback_count);
if (writeback_stat >
CONGESTION_ON_THRESH(fsc->mount_options->congestion_kb))
set_bdi_congested(&fsc->backing_dev_info, BLK_RW_ASYNC);
set_page_writeback(page);
err = ceph_osdc_writepages(osdc, ceph_vino(inode),
&ci->i_layout, snapc,
page_off, len,
truncate_seq, truncate_size,
&inode->i_mtime, &page, 1);
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);
goto out;
}
dout("writepage setting page/mapping error %d %p\n",
err, page);
SetPageError(page);
mapping_set_error(&inode->i_data, err);
wbc->pages_skipped++;
} else {
dout("writepage cleaned page %p\n", page);
err = 0; /* vfs expects us to return 0 */
}
page->private = 0;
ClearPagePrivate(page);
end_page_writeback(page);
ceph_put_wrbuffer_cap_refs(ci, 1, snapc);
ceph_put_snap_context(snapc); /* page's reference */
out:
return err;
}
static int ceph_writepage(struct page *page, struct writeback_control *wbc)
{
int err;
struct inode *inode = page->mapping->host;
BUG_ON(!inode);
ihold(inode);
err = writepage_nounlock(page, wbc);
if (err == -ERESTARTSYS) {
/* direct memory reclaimer was killed by SIGKILL. return 0
* to prevent caller from setting mapping/page error */
err = 0;
}
unlock_page(page);
iput(inode);
return err;
}
/*
* lame release_pages helper. release_pages() isn't exported to
* modules.
*/
static void ceph_release_pages(struct page **pages, int num)
{
struct pagevec pvec;
int i;
pagevec_init(&pvec, 0);
for (i = 0; i < num; i++) {
if (pagevec_add(&pvec, pages[i]) == 0)
pagevec_release(&pvec);
}
pagevec_release(&pvec);
}
/*
* async writeback completion handler.
*
* If we get an error, set the mapping error bit, but not the individual
* page error bits.
*/
static void writepages_finish(struct ceph_osd_request *req)
{
struct inode *inode = req->r_inode;
struct ceph_inode_info *ci = ceph_inode(inode);
struct ceph_osd_data *osd_data;
struct page *page;
int num_pages, total_pages = 0;
int i, j;
int rc = req->r_result;
struct ceph_snap_context *snapc = req->r_snapc;
struct address_space *mapping = inode->i_mapping;
struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
bool remove_page;
dout("writepages_finish %p rc %d\n", inode, rc);
if (rc < 0)
mapping_set_error(mapping, rc);
/*
* We lost the cache cap, need to truncate the page before
* it is unlocked, otherwise we'd truncate it later in the
* page truncation thread, possibly losing some data that
* raced its way in
*/
remove_page = !(ceph_caps_issued(ci) &
(CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO));
/* clean all pages */
for (i = 0; i < req->r_num_ops; i++) {
if (req->r_ops[i].op != CEPH_OSD_OP_WRITE)
break;
osd_data = osd_req_op_extent_osd_data(req, i);
BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGES);
num_pages = calc_pages_for((u64)osd_data->alignment,
(u64)osd_data->length);
total_pages += num_pages;
for (j = 0; j < num_pages; j++) {
page = osd_data->pages[j];
BUG_ON(!page);
WARN_ON(!PageUptodate(page));
if (atomic_long_dec_return(&fsc->writeback_count) <
CONGESTION_OFF_THRESH(
fsc->mount_options->congestion_kb))
clear_bdi_congested(&fsc->backing_dev_info,
BLK_RW_ASYNC);
if (rc < 0)
SetPageError(page);
ceph_put_snap_context(page_snap_context(page));
page->private = 0;
ClearPagePrivate(page);
dout("unlocking %p\n", page);
end_page_writeback(page);
if (remove_page)
generic_error_remove_page(inode->i_mapping,
page);
unlock_page(page);
}
dout("writepages_finish %p wrote %llu bytes cleaned %d pages\n",
inode, osd_data->length, rc >= 0 ? num_pages : 0);
ceph_release_pages(osd_data->pages, num_pages);
}
ceph_put_wrbuffer_cap_refs(ci, total_pages, snapc);
osd_data = osd_req_op_extent_osd_data(req, 0);
if (osd_data->pages_from_pool)
mempool_free(osd_data->pages,
ceph_sb_to_client(inode->i_sb)->wb_pagevec_pool);
else
kfree(osd_data->pages);
ceph_osdc_put_request(req);
}
/*
* initiate async writeback
*/
static int ceph_writepages_start(struct address_space *mapping,
struct writeback_control *wbc)
{
struct inode *inode = mapping->host;
struct ceph_inode_info *ci = ceph_inode(inode);
struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
struct ceph_vino vino = ceph_vino(inode);
pgoff_t index, start, end;
int range_whole = 0;
int should_loop = 1;
pgoff_t max_pages = 0, max_pages_ever = 0;
struct ceph_snap_context *snapc = NULL, *last_snapc = NULL, *pgsnapc;
struct pagevec pvec;
int done = 0;
int rc = 0;
unsigned int wsize = i_blocksize(inode);
struct ceph_osd_request *req = NULL;
int do_sync = 0;
loff_t snap_size, i_size;
u64 truncate_size;
u32 truncate_seq;
/*
* Include a 'sync' in the OSD request if this is a data
* integrity write (e.g., O_SYNC write or fsync()), or if our
* cap is being revoked.
*/
if ((wbc->sync_mode == WB_SYNC_ALL) ||
ceph_caps_revoking(ci, CEPH_CAP_FILE_BUFFER))
do_sync = 1;
dout("writepages_start %p dosync=%d (mode=%s)\n",
inode, do_sync,
wbc->sync_mode == WB_SYNC_NONE ? "NONE" :
(wbc->sync_mode == WB_SYNC_ALL ? "ALL" : "HOLD"));
if (READ_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) {
if (ci->i_wrbuffer_ref > 0) {
pr_warn_ratelimited(
"writepage_start %p %lld forced umount\n",
inode, ceph_ino(inode));
}
mapping_set_error(mapping, -EIO);
return -EIO; /* we're in a forced umount, don't write! */
}
if (fsc->mount_options->wsize && fsc->mount_options->wsize < wsize)
wsize = fsc->mount_options->wsize;
if (wsize < PAGE_SIZE)
wsize = PAGE_SIZE;
max_pages_ever = wsize >> PAGE_SHIFT;
pagevec_init(&pvec, 0);
/* where to start/end? */
if (wbc->range_cyclic) {
start = mapping->writeback_index; /* Start from prev offset */
end = -1;
dout(" cyclic, start at %lu\n", start);
} else {
start = wbc->range_start >> PAGE_SHIFT;
end = wbc->range_end >> PAGE_SHIFT;
if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX)
range_whole = 1;
should_loop = 0;
dout(" not cyclic, %lu to %lu\n", start, end);
}
index = start;
retry:
/* find oldest snap context with dirty data */
ceph_put_snap_context(snapc);
snap_size = -1;
snapc = get_oldest_context(inode, &snap_size,
&truncate_size, &truncate_seq);
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);
i_size = i_size_read(inode);
if (last_snapc && snapc != last_snapc) {
/* if we switched to a newer snapc, restart our scan at the
* start of the original file range. */
dout(" snapc differs from last pass, restarting at %lu\n",
index);
index = start;
}
last_snapc = snapc;
while (!done && index <= end) {
unsigned i;
int first;
pgoff_t strip_unit_end = 0;
int num_ops = 0, op_idx;
int pvec_pages, locked_pages = 0;
struct page **pages = NULL, **data_pages;
mempool_t *pool = NULL; /* Becomes non-null if mempool used */
struct page *page;
int want;
u64 offset = 0, len = 0;
max_pages = max_pages_ever;
get_more_pages:
first = -1;
want = min(end - index,
min((pgoff_t)PAGEVEC_SIZE,
max_pages - (pgoff_t)locked_pages) - 1)
+ 1;
pvec_pages = pagevec_lookup_tag(&pvec, mapping, &index,
PAGECACHE_TAG_DIRTY,
want);
dout("pagevec_lookup_tag got %d\n", pvec_pages);
if (!pvec_pages && !locked_pages)
break;
for (i = 0; i < pvec_pages && locked_pages < max_pages; i++) {
page = pvec.pages[i];
dout("? %p idx %lu\n", page, page->index);
if (locked_pages == 0)
lock_page(page); /* first page */
else if (!trylock_page(page))
break;
/* only dirty pages, or our accounting breaks */
if (unlikely(!PageDirty(page)) ||
unlikely(page->mapping != mapping)) {
dout("!dirty or !mapping %p\n", page);
unlock_page(page);
break;
}
if (!wbc->range_cyclic && page->index > end) {
dout("end of range %p\n", page);
done = 1;
unlock_page(page);
break;
}
if (strip_unit_end && (page->index > strip_unit_end)) {
dout("end of strip unit %p\n", page);
unlock_page(page);
break;
}
if (wbc->sync_mode != WB_SYNC_NONE) {
dout("waiting on writeback %p\n", page);
wait_on_page_writeback(page);
}
if (page_offset(page) >=
(snap_size == -1 ? i_size : snap_size)) {
dout("%p page eof %llu\n", page,
(snap_size == -1 ? i_size : snap_size));
done = 1;
unlock_page(page);
break;
}
if (PageWriteback(page)) {
dout("%p under writeback\n", page);
unlock_page(page);
break;
}
/* only if matching snap context */
pgsnapc = page_snap_context(page);
if (pgsnapc->seq > snapc->seq) {
dout("page snapc %p %lld > oldest %p %lld\n",
pgsnapc, pgsnapc->seq, snapc, snapc->seq);
unlock_page(page);
if (!locked_pages)
continue; /* keep looking for snap */
break;
}
if (!clear_page_dirty_for_io(page)) {
dout("%p !clear_page_dirty_for_io\n", page);
unlock_page(page);
break;
}
/*
* 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;
/* prepare async write request */
offset = (u64)page_offset(page);
len = wsize;
rc = ceph_calc_file_object_mapping(&ci->i_layout,
offset, len,
&objnum, &objoff,
&len);
if (rc < 0) {
unlock_page(page);
break;
}
num_ops = 1 + do_sync;
strip_unit_end = page->index +
((len - 1) >> PAGE_SHIFT);
BUG_ON(pages);
max_pages = calc_pages_for(0, (u64)len);
pages = kmalloc(max_pages * sizeof (*pages),
GFP_NOFS);
if (!pages) {
pool = fsc->wb_pagevec_pool;
pages = mempool_alloc(pool, GFP_NOFS);
BUG_ON(!pages);
}
len = 0;
} else if (page->index !=
(offset + len) >> PAGE_SHIFT) {
if (num_ops >= (pool ? CEPH_OSD_SLAB_OPS :
CEPH_OSD_MAX_OPS)) {
redirty_page_for_writepage(wbc, page);
unlock_page(page);
break;
}
num_ops++;
offset = (u64)page_offset(page);
len = 0;
}
/* note position of first page in pvec */
if (first < 0)
first = i;
dout("%p will write page %p idx %lu\n",
inode, page, page->index);
if (atomic_long_inc_return(&fsc->writeback_count) >
CONGESTION_ON_THRESH(
fsc->mount_options->congestion_kb)) {
set_bdi_congested(&fsc->backing_dev_info,
BLK_RW_ASYNC);
}
pages[locked_pages] = page;
locked_pages++;
len += PAGE_SIZE;
}
/* did we get anything? */
if (!locked_pages)
goto release_pvec_pages;
if (i) {
int j;
BUG_ON(!locked_pages || first < 0);
if (pvec_pages && i == pvec_pages &&
locked_pages < max_pages) {
dout("reached end pvec, trying for more\n");