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Message-Id: <1376538704-6659-1-git-send-email-liwang@ubuntukylin.com>
Date: Thu, 15 Aug 2013 11:51:44 +0800
From: Li Wang <liwang@...ntukylin.com>
To: ceph-devel@...r.kernel.org
Cc: Sage Weil <sage@...tank.com>, linux-kernel@...r.kernel.org,
Li Wang <liwang@...ntukylin.com>,
Yunchuan Wen <yunchuanwen@...ntukylin.com>
Subject: [PATCH v5] Ceph: Punch hole support for kernel client
This patch implements fallocate and punch hole support for Ceph kernel client.
Signed-off-by: Li Wang <liwang@...ntukylin.com>
Signed-off-by: Yunchuan Wen <yunchuanwen@...ntukylin.com>
---
Against v3:
Passed the fsx test from xfstests.
Truncate rather than delete the first object. Thanks go to Sage and Zheng for the explanation.
Silence the OSD ENOENT complaints.
---
fs/ceph/file.c | 196 +++++++++++++++++++++++++++++++++++++++++++++++++
net/ceph/osd_client.c | 11 ++-
2 files changed, 205 insertions(+), 2 deletions(-)
diff --git a/fs/ceph/file.c b/fs/ceph/file.c
index 2ddf061..e2bcd5c 100644
--- a/fs/ceph/file.c
+++ b/fs/ceph/file.c
@@ -8,6 +8,7 @@
#include <linux/namei.h>
#include <linux/writeback.h>
#include <linux/aio.h>
+#include <linux/falloc.h>
#include "super.h"
#include "mds_client.h"
@@ -871,6 +872,200 @@ out:
return offset;
}
+static inline void ceph_zero_partial_page(
+ struct inode *inode, loff_t offset, unsigned size)
+{
+ struct page *page;
+ pgoff_t index = offset >> PAGE_CACHE_SHIFT;
+
+ page = find_lock_page(inode->i_mapping, index);
+ if (page) {
+ wait_on_page_writeback(page);
+ zero_user(page, offset & (PAGE_CACHE_SIZE - 1), size);
+ unlock_page(page);
+ page_cache_release(page);
+ }
+}
+
+static void ceph_zero_pagecache_range(struct inode *inode, loff_t offset,
+ loff_t length)
+{
+ loff_t nearly = round_up(offset, PAGE_CACHE_SIZE);
+ if (offset < nearly) {
+ loff_t size = nearly - offset;
+ if (length < size)
+ size = length;
+ ceph_zero_partial_page(inode, offset, size);
+ offset += size;
+ length -= size;
+ }
+ if (length >= PAGE_CACHE_SIZE) {
+ loff_t size = round_down(length, PAGE_CACHE_SIZE);
+ truncate_pagecache_range(inode, offset, offset + size - 1);
+ offset += size;
+ length -= size;
+ }
+ if (length)
+ ceph_zero_partial_page(inode, offset, length);
+}
+
+static int ceph_zero_partial_object(struct inode *inode,
+ loff_t offset, loff_t *length)
+{
+ struct ceph_inode_info *ci = ceph_inode(inode);
+ struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
+ struct ceph_osd_request *req;
+ int ret = 0;
+ loff_t zero = 0;
+ int op;
+
+ if (!length) {
+ op = offset ? CEPH_OSD_OP_DELETE : CEPH_OSD_OP_TRUNCATE;
+ length = &zero;
+ } else {
+ op = CEPH_OSD_OP_ZERO;
+ }
+
+ req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
+ ceph_vino(inode),
+ offset, length,
+ 1, op,
+ CEPH_OSD_FLAG_WRITE |
+ CEPH_OSD_FLAG_ONDISK,
+ NULL, 0, 0, false);
+ if (IS_ERR(req)) {
+ ret = PTR_ERR(req);
+ goto out;
+ }
+
+ ceph_osdc_build_request(req, offset, NULL, ceph_vino(inode).snap,
+ &inode->i_mtime);
+
+ ret = ceph_osdc_start_request(&fsc->client->osdc, req, false);
+ if (!ret) {
+ ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
+ if (ret == -ENOENT)
+ ret = 0;
+ }
+ ceph_osdc_put_request(req);
+
+out:
+ return ret;
+}
+
+static int ceph_zero_objects(struct inode *inode, loff_t offset, loff_t length)
+{
+ int ret = 0;
+ struct ceph_inode_info *ci = ceph_inode(inode);
+ __s32 stripe_unit = ceph_file_layout_su(ci->i_layout);
+ __s32 stripe_count = ceph_file_layout_stripe_count(ci->i_layout);
+ __s32 object_size = ceph_file_layout_object_size(ci->i_layout);
+ loff_t object_set_size = (loff_t)object_size * stripe_count;
+
+ loff_t nearly = (offset + object_set_size - 1)
+ / object_set_size * object_set_size;
+ while (length && offset < nearly) {
+ loff_t size = length;
+ ret = ceph_zero_partial_object(inode, offset, &size);
+ if (ret < 0)
+ return ret;
+ offset += size;
+ length -= size;
+ }
+ while (length >= object_set_size) {
+ int i;
+ loff_t pos = offset;
+ for (i = 0; i < stripe_count; ++i) {
+ ret = ceph_zero_partial_object(inode, pos, NULL);
+ if (ret < 0)
+ return ret;
+ pos += stripe_unit;
+ }
+ offset += object_set_size;
+ length -= object_set_size;
+ }
+ while (length) {
+ loff_t size = length;
+ ret = ceph_zero_partial_object(inode, offset, &size);
+ if (ret < 0)
+ return ret;
+ offset += size;
+ length -= size;
+ }
+ return ret;
+}
+
+static long ceph_fallocate(struct file *file, int mode,
+ loff_t offset, loff_t length)
+{
+ struct ceph_file_info *fi = file->private_data;
+ struct inode *inode = file->f_dentry->d_inode;
+ struct ceph_inode_info *ci = ceph_inode(inode);
+ struct ceph_osd_client *osdc =
+ &ceph_inode_to_client(inode)->client->osdc;
+ int want, got = 0;
+ int dirty;
+ int ret = 0;
+ loff_t endoff = 0;
+ loff_t size;
+
+ if (!S_ISREG(inode->i_mode))
+ return -EOPNOTSUPP;
+
+ if (IS_SWAPFILE(inode))
+ return -ETXTBSY;
+
+ mutex_lock(&inode->i_mutex);
+
+ if (ceph_snap(inode) != CEPH_NOSNAP) {
+ ret = -EROFS;
+ goto unlock;
+ }
+
+ if (ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL) &&
+ !(mode & FALLOC_FL_PUNCH_HOLE)) {
+ ret = -ENOSPC;
+ goto unlock;
+ }
+
+ size = i_size_read(inode);
+ if (!(mode & FALLOC_FL_KEEP_SIZE))
+ endoff = offset + length;
+
+ 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 unlock;
+
+ if (mode & FALLOC_FL_PUNCH_HOLE) {
+ if (offset < size)
+ ceph_zero_pagecache_range(inode, offset, length);
+ ret = ceph_zero_objects(inode, offset, length);
+ } else if (endoff > size) {
+ truncate_pagecache_range(inode, size, -1);
+ if (ceph_inode_set_size(inode, endoff))
+ ceph_check_caps(ceph_inode(inode),
+ CHECK_CAPS_AUTHONLY, NULL);
+ }
+
+ if (!ret) {
+ 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);
+ }
+
+ ceph_put_cap_refs(ci, got);
+unlock:
+ mutex_unlock(&inode->i_mutex);
+ return ret;
+}
+
const struct file_operations ceph_file_fops = {
.open = ceph_open,
.release = ceph_release,
@@ -887,5 +1082,6 @@ const struct file_operations ceph_file_fops = {
.splice_write = generic_file_splice_write,
.unlocked_ioctl = ceph_ioctl,
.compat_ioctl = ceph_ioctl,
+ .fallocate = ceph_fallocate,
};
diff --git a/net/ceph/osd_client.c b/net/ceph/osd_client.c
index dd47889..c1d15ab 100644
--- a/net/ceph/osd_client.c
+++ b/net/ceph/osd_client.c
@@ -503,7 +503,9 @@ void osd_req_op_extent_init(struct ceph_osd_request *osd_req,
struct ceph_osd_req_op *op = _osd_req_op_init(osd_req, which, opcode);
size_t payload_len = 0;
- BUG_ON(opcode != CEPH_OSD_OP_READ && opcode != CEPH_OSD_OP_WRITE);
+ BUG_ON(opcode != CEPH_OSD_OP_READ && opcode != CEPH_OSD_OP_WRITE &&
+ opcode != CEPH_OSD_OP_DELETE && opcode != CEPH_OSD_OP_ZERO &&
+ opcode != CEPH_OSD_OP_TRUNCATE);
op->extent.offset = offset;
op->extent.length = length;
@@ -631,6 +633,9 @@ static u64 osd_req_encode_op(struct ceph_osd_request *req,
break;
case CEPH_OSD_OP_READ:
case CEPH_OSD_OP_WRITE:
+ case CEPH_OSD_OP_ZERO:
+ case CEPH_OSD_OP_DELETE:
+ case CEPH_OSD_OP_TRUNCATE:
if (src->op == CEPH_OSD_OP_WRITE)
request_data_len = src->extent.length;
dst->extent.offset = cpu_to_le64(src->extent.offset);
@@ -715,7 +720,9 @@ struct ceph_osd_request *ceph_osdc_new_request(struct ceph_osd_client *osdc,
u64 object_base;
int r;
- BUG_ON(opcode != CEPH_OSD_OP_READ && opcode != CEPH_OSD_OP_WRITE);
+ BUG_ON(opcode != CEPH_OSD_OP_READ && opcode != CEPH_OSD_OP_WRITE &&
+ opcode != CEPH_OSD_OP_DELETE && opcode != CEPH_OSD_OP_ZERO &&
+ opcode != CEPH_OSD_OP_TRUNCATE);
req = ceph_osdc_alloc_request(osdc, snapc, num_ops, use_mempool,
GFP_NOFS);
--
1.7.9.5
--
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