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Commit 7971bd92 authored by Sage Weil's avatar Sage Weil
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ceph: revert commit 22cddde1 

commit 22cddde1 breaks the atomicity of write operation, it also
introduces a deadlock between write and truncate.
Signed-off-by: default avatarYan, Zheng <zheng.z.yan@intel.com>
Reviewed-by: default avatarGreg Farnum <greg@inktank.com>

Conflicts:
	fs/ceph/addr.c
parent a8673d61
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Showing with 48 additions and 77 deletions
fs/ceph/addr.c
View file @ 7971bd92
......@@ -1067,51 +1067,23 @@ static int ceph_write_begin(struct file *file, struct address_space *mapping,
struct page **pagep, void **fsdata)
{
struct inode *inode = file_inode(file);
struct ceph_inode_info *ci = ceph_inode(inode);
struct ceph_file_info *fi = file->private_data;
struct page *page;
pgoff_t index = pos >> PAGE_CACHE_SHIFT;
int r, want, got = 0;
if (fi->fmode & CEPH_FILE_MODE_LAZY)
want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO;
else
want = CEPH_CAP_FILE_BUFFER;
dout("write_begin %p %llx.%llx %llu~%u getting caps. i_size %llu\n",
inode, ceph_vinop(inode), pos, len, inode->i_size);
r = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, &got, pos+len);
if (r < 0)
return r;
dout("write_begin %p %llx.%llx %llu~%u got cap refs on %s\n",
inode, ceph_vinop(inode), pos, len, ceph_cap_string(got));
if (!(got & (CEPH_CAP_FILE_BUFFER|CEPH_CAP_FILE_LAZYIO))) {
ceph_put_cap_refs(ci, got);
return -EAGAIN;
}
int r;
do {
/* get a page */
page = grab_cache_page_write_begin(mapping, index, 0);
if (!page) {
r = -ENOMEM;
break;
}
if (!page)
return -ENOMEM;
*pagep = page;
dout("write_begin file %p inode %p page %p %d~%d\n", file,
inode, page, (int)pos, (int)len);
r = ceph_update_writeable_page(file, pos, len, page);
if (r)
page_cache_release(page);
} while (r == -EAGAIN);
if (r) {
ceph_put_cap_refs(ci, got);
} else {
*pagep = page;
*(int *)fsdata = got;
}
return r;
}
......@@ -1125,12 +1097,10 @@ static int ceph_write_end(struct file *file, struct address_space *mapping,
struct page *page, void *fsdata)
{
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_mds_client *mdsc = fsc->mdsc;
unsigned from = pos & (PAGE_CACHE_SIZE - 1);
int check_cap = 0;
int got = (unsigned long)fsdata;
dout("write_end file %p inode %p page %p %d~%d (%d)\n", file,
inode, page, (int)pos, (int)copied, (int)len);
......@@ -1153,19 +1123,6 @@ static int ceph_write_end(struct file *file, struct address_space *mapping,
up_read(&mdsc->snap_rwsem);
page_cache_release(page);
if (copied > 0) {
int dirty;
spin_lock(&ci->i_ceph_lock);
dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR);
spin_unlock(&ci->i_ceph_lock);
if (dirty)
__mark_inode_dirty(inode, dirty);
}
dout("write_end %p %llx.%llx %llu~%u dropping cap refs on %s\n",
inode, ceph_vinop(inode), pos, len, ceph_cap_string(got));
ceph_put_cap_refs(ci, got);
if (check_cap)
ceph_check_caps(ceph_inode(inode), CHECK_CAPS_AUTHONLY, NULL);
......
fs/ceph/file.c
View file @ 7971bd92
......@@ -718,53 +718,63 @@ static ssize_t ceph_aio_write(struct kiocb *iocb, const struct iovec *iov,
struct ceph_osd_client *osdc =
&ceph_sb_to_client(inode->i_sb)->client->osdc;
loff_t endoff = pos + iov->iov_len;
int got = 0;
int ret, err, written;
int want, got = 0;
int ret, err;
if (ceph_snap(inode) != CEPH_NOSNAP)
return -EROFS;
retry_snap:
written = 0;
if (ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL))
return -ENOSPC;
__ceph_do_pending_vmtruncate(inode);
dout("aio_write %p %llx.%llx %llu~%u getting caps. i_size %llu\n",
inode, ceph_vinop(inode), pos, (unsigned)iov->iov_len,
inode->i_size);
if (fi->fmode & CEPH_FILE_MODE_LAZY)
want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO;
else
want = CEPH_CAP_FILE_BUFFER;
ret = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, &got, endoff);
if (ret < 0)
goto out_put;
/*
* try to do a buffered write. if we don't have sufficient
* caps, we'll get -EAGAIN from generic_file_aio_write, or a
* short write if we only get caps for some pages.
*/
if (!(iocb->ki_filp->f_flags & O_DIRECT) &&
!(inode->i_sb->s_flags & MS_SYNCHRONOUS) &&
!(fi->flags & CEPH_F_SYNC)) {
ret = generic_file_aio_write(iocb, iov, nr_segs, pos);
if (ret >= 0)
written = ret;
dout("aio_write %p %llx.%llx %llu~%u got cap refs on %s\n",
inode, ceph_vinop(inode), pos, (unsigned)iov->iov_len,
ceph_cap_string(got));
if ((got & (CEPH_CAP_FILE_BUFFER|CEPH_CAP_FILE_LAZYIO)) == 0 ||
(iocb->ki_filp->f_flags & O_DIRECT) ||
(inode->i_sb->s_flags & MS_SYNCHRONOUS) ||
(fi->flags & CEPH_F_SYNC)) {
ret = ceph_sync_write(file, iov->iov_base, iov->iov_len,
&iocb->ki_pos);
} else {
/*
* buffered write; drop Fw early to avoid slow
* revocation if we get stuck on balance_dirty_pages
*/
int dirty;
spin_lock(&ci->i_ceph_lock);
dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR);
spin_unlock(&ci->i_ceph_lock);
ceph_put_cap_refs(ci, got);
ret = generic_file_aio_write(iocb, iov, nr_segs, pos);
if ((ret >= 0 || ret == -EIOCBQUEUED) &&
((file->f_flags & O_SYNC) || IS_SYNC(file->f_mapping->host)
|| ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_NEARFULL))) {
err = vfs_fsync_range(file, pos, pos + written - 1, 1);
err = vfs_fsync_range(file, pos, pos + ret - 1, 1);
if (err < 0)
ret = err;
}
if ((ret < 0 && ret != -EAGAIN) || pos + written >= endoff)
goto out;
}
dout("aio_write %p %llx.%llx %llu~%u getting caps. i_size %llu\n",
inode, ceph_vinop(inode), pos + written,
(unsigned)iov->iov_len - written, inode->i_size);
ret = ceph_get_caps(ci, CEPH_CAP_FILE_WR, 0, &got, endoff);
if (ret < 0)
if (dirty)
__mark_inode_dirty(inode, dirty);
goto out;
}
dout("aio_write %p %llx.%llx %llu~%u got cap refs on %s\n",
inode, ceph_vinop(inode), pos + written,
(unsigned)iov->iov_len - written, ceph_cap_string(got));
ret = ceph_sync_write(file, iov->iov_base + written,
iov->iov_len - written, &iocb->ki_pos);
if (ret >= 0) {
int dirty;
spin_lock(&ci->i_ceph_lock);
......@@ -773,10 +783,13 @@ static ssize_t ceph_aio_write(struct kiocb *iocb, const struct iovec *iov,
if (dirty)
__mark_inode_dirty(inode, dirty);
}
out_put:
dout("aio_write %p %llx.%llx %llu~%u dropping cap refs on %s\n",
inode, ceph_vinop(inode), pos + written,
(unsigned)iov->iov_len - written, ceph_cap_string(got));
inode, ceph_vinop(inode), pos, (unsigned)iov->iov_len,
ceph_cap_string(got));
ceph_put_cap_refs(ci, got);
out:
if (ret == -EOLDSNAPC) {
dout("aio_write %p %llx.%llx %llu~%u got EOLDSNAPC, retrying\n",
......
fs/ceph/mds_client.c
View file @ 7971bd92
......@@ -1916,6 +1916,7 @@ static void __wake_requests(struct ceph_mds_client *mdsc,
req = list_entry(tmp_list.next,
struct ceph_mds_request, r_wait);
list_del_init(&req->r_wait);
dout(" wake request %p tid %llu\n", req, req->r_tid);
__do_request(mdsc, req);
}
}
......
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