Yehuda Sadeh | 3d14c5d | 2010-04-06 15:14:15 -0700 | [diff] [blame] | 1 | #include <linux/ceph/ceph_debug.h> |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2 | |
| 3 | #include <linux/backing-dev.h> |
| 4 | #include <linux/fs.h> |
| 5 | #include <linux/mm.h> |
| 6 | #include <linux/pagemap.h> |
| 7 | #include <linux/writeback.h> /* generic_writepages */ |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 8 | #include <linux/slab.h> |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 9 | #include <linux/pagevec.h> |
| 10 | #include <linux/task_io_accounting_ops.h> |
| 11 | |
| 12 | #include "super.h" |
Yehuda Sadeh | 3d14c5d | 2010-04-06 15:14:15 -0700 | [diff] [blame] | 13 | #include "mds_client.h" |
Milosz Tanski | 99ccbd2 | 2013-08-21 17:29:54 -0400 | [diff] [blame] | 14 | #include "cache.h" |
Yehuda Sadeh | 3d14c5d | 2010-04-06 15:14:15 -0700 | [diff] [blame] | 15 | #include <linux/ceph/osd_client.h> |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 16 | |
| 17 | /* |
| 18 | * Ceph address space ops. |
| 19 | * |
| 20 | * There are a few funny things going on here. |
| 21 | * |
| 22 | * The page->private field is used to reference a struct |
| 23 | * ceph_snap_context for _every_ dirty page. This indicates which |
| 24 | * snapshot the page was logically dirtied in, and thus which snap |
| 25 | * context needs to be associated with the osd write during writeback. |
| 26 | * |
| 27 | * Similarly, struct ceph_inode_info maintains a set of counters to |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 28 | * count dirty pages on the inode. In the absence of snapshots, |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 29 | * i_wrbuffer_ref == i_wrbuffer_ref_head == the dirty page count. |
| 30 | * |
| 31 | * When a snapshot is taken (that is, when the client receives |
| 32 | * notification that a snapshot was taken), each inode with caps and |
| 33 | * with dirty pages (dirty pages implies there is a cap) gets a new |
| 34 | * ceph_cap_snap in the i_cap_snaps list (which is sorted in ascending |
| 35 | * order, new snaps go to the tail). The i_wrbuffer_ref_head count is |
| 36 | * moved to capsnap->dirty. (Unless a sync write is currently in |
| 37 | * progress. In that case, the capsnap is said to be "pending", new |
| 38 | * writes cannot start, and the capsnap isn't "finalized" until the |
| 39 | * write completes (or fails) and a final size/mtime for the inode for |
| 40 | * that snap can be settled upon.) i_wrbuffer_ref_head is reset to 0. |
| 41 | * |
| 42 | * On writeback, we must submit writes to the osd IN SNAP ORDER. So, |
| 43 | * we look for the first capsnap in i_cap_snaps and write out pages in |
| 44 | * that snap context _only_. Then we move on to the next capsnap, |
| 45 | * eventually reaching the "live" or "head" context (i.e., pages that |
| 46 | * are not yet snapped) and are writing the most recently dirtied |
| 47 | * pages. |
| 48 | * |
| 49 | * Invalidate and so forth must take care to ensure the dirty page |
| 50 | * accounting is preserved. |
| 51 | */ |
| 52 | |
Yehuda Sadeh | 2baba25 | 2009-12-18 13:51:57 -0800 | [diff] [blame] | 53 | #define CONGESTION_ON_THRESH(congestion_kb) (congestion_kb >> (PAGE_SHIFT-10)) |
| 54 | #define CONGESTION_OFF_THRESH(congestion_kb) \ |
| 55 | (CONGESTION_ON_THRESH(congestion_kb) - \ |
| 56 | (CONGESTION_ON_THRESH(congestion_kb) >> 2)) |
| 57 | |
Yan, Zheng | 61600ef | 2012-05-28 14:44:30 +0800 | [diff] [blame] | 58 | static inline struct ceph_snap_context *page_snap_context(struct page *page) |
| 59 | { |
| 60 | if (PagePrivate(page)) |
| 61 | return (void *)page->private; |
| 62 | return NULL; |
| 63 | } |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 64 | |
| 65 | /* |
| 66 | * Dirty a page. Optimistically adjust accounting, on the assumption |
| 67 | * that we won't race with invalidate. If we do, readjust. |
| 68 | */ |
| 69 | static int ceph_set_page_dirty(struct page *page) |
| 70 | { |
| 71 | struct address_space *mapping = page->mapping; |
| 72 | struct inode *inode; |
| 73 | struct ceph_inode_info *ci; |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 74 | struct ceph_snap_context *snapc; |
Sha Zhengju | 7d6e1f5 | 2013-08-21 16:27:34 +0800 | [diff] [blame] | 75 | int ret; |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 76 | |
| 77 | if (unlikely(!mapping)) |
| 78 | return !TestSetPageDirty(page); |
| 79 | |
Sha Zhengju | 7d6e1f5 | 2013-08-21 16:27:34 +0800 | [diff] [blame] | 80 | if (PageDirty(page)) { |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 81 | dout("%p set_page_dirty %p idx %lu -- already dirty\n", |
| 82 | mapping->host, page, page->index); |
Sha Zhengju | 7d6e1f5 | 2013-08-21 16:27:34 +0800 | [diff] [blame] | 83 | BUG_ON(!PagePrivate(page)); |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 84 | return 0; |
| 85 | } |
| 86 | |
| 87 | inode = mapping->host; |
| 88 | ci = ceph_inode(inode); |
| 89 | |
| 90 | /* |
| 91 | * Note that we're grabbing a snapc ref here without holding |
| 92 | * any locks! |
| 93 | */ |
| 94 | snapc = ceph_get_snap_context(ci->i_snap_realm->cached_context); |
| 95 | |
| 96 | /* dirty the head */ |
Sage Weil | be65559 | 2011-11-30 09:47:09 -0800 | [diff] [blame] | 97 | spin_lock(&ci->i_ceph_lock); |
Sage Weil | 7d8cb26 | 2010-08-24 08:44:16 -0700 | [diff] [blame] | 98 | if (ci->i_head_snapc == NULL) |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 99 | ci->i_head_snapc = ceph_get_snap_context(snapc); |
| 100 | ++ci->i_wrbuffer_ref_head; |
| 101 | if (ci->i_wrbuffer_ref == 0) |
Dave Chinner | 0444d76 | 2011-03-29 18:08:50 +1100 | [diff] [blame] | 102 | ihold(inode); |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 103 | ++ci->i_wrbuffer_ref; |
| 104 | dout("%p set_page_dirty %p idx %lu head %d/%d -> %d/%d " |
| 105 | "snapc %p seq %lld (%d snaps)\n", |
| 106 | mapping->host, page, page->index, |
| 107 | ci->i_wrbuffer_ref-1, ci->i_wrbuffer_ref_head-1, |
| 108 | ci->i_wrbuffer_ref, ci->i_wrbuffer_ref_head, |
| 109 | snapc, snapc->seq, snapc->num_snaps); |
Sage Weil | be65559 | 2011-11-30 09:47:09 -0800 | [diff] [blame] | 110 | spin_unlock(&ci->i_ceph_lock); |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 111 | |
Sha Zhengju | 7d6e1f5 | 2013-08-21 16:27:34 +0800 | [diff] [blame] | 112 | /* |
| 113 | * Reference snap context in page->private. Also set |
| 114 | * PagePrivate so that we get invalidatepage callback. |
| 115 | */ |
| 116 | BUG_ON(PagePrivate(page)); |
| 117 | page->private = (unsigned long)snapc; |
| 118 | SetPagePrivate(page); |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 119 | |
Sha Zhengju | 7d6e1f5 | 2013-08-21 16:27:34 +0800 | [diff] [blame] | 120 | ret = __set_page_dirty_nobuffers(page); |
| 121 | WARN_ON(!PageLocked(page)); |
| 122 | WARN_ON(!page->mapping); |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 123 | |
Sha Zhengju | 7d6e1f5 | 2013-08-21 16:27:34 +0800 | [diff] [blame] | 124 | return ret; |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 125 | } |
| 126 | |
| 127 | /* |
| 128 | * If we are truncating the full page (i.e. offset == 0), adjust the |
| 129 | * dirty page counters appropriately. Only called if there is private |
| 130 | * data on the page. |
| 131 | */ |
Lukas Czerner | d47992f | 2013-05-21 23:17:23 -0400 | [diff] [blame] | 132 | static void ceph_invalidatepage(struct page *page, unsigned int offset, |
| 133 | unsigned int length) |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 134 | { |
Alexander Beregalov | 4ce1e9a | 2010-02-22 17:17:44 +0300 | [diff] [blame] | 135 | struct inode *inode; |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 136 | struct ceph_inode_info *ci; |
Yan, Zheng | 61600ef | 2012-05-28 14:44:30 +0800 | [diff] [blame] | 137 | struct ceph_snap_context *snapc = page_snap_context(page); |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 138 | |
Alexander Beregalov | 4ce1e9a | 2010-02-22 17:17:44 +0300 | [diff] [blame] | 139 | inode = page->mapping->host; |
Milosz Tanski | b150f5c1 | 2013-08-09 12:59:55 -0400 | [diff] [blame] | 140 | ci = ceph_inode(inode); |
| 141 | |
| 142 | if (offset != 0 || length != PAGE_CACHE_SIZE) { |
| 143 | dout("%p invalidatepage %p idx %lu partial dirty page %u~%u\n", |
| 144 | inode, page, page->index, offset, length); |
| 145 | return; |
| 146 | } |
Alexander Beregalov | 4ce1e9a | 2010-02-22 17:17:44 +0300 | [diff] [blame] | 147 | |
Milosz Tanski | 99ccbd2 | 2013-08-21 17:29:54 -0400 | [diff] [blame] | 148 | ceph_invalidate_fscache_page(inode, page); |
| 149 | |
| 150 | if (!PagePrivate(page)) |
| 151 | return; |
| 152 | |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 153 | /* |
| 154 | * We can get non-dirty pages here due to races between |
| 155 | * set_page_dirty and truncate_complete_page; just spit out a |
| 156 | * warning, in case we end up with accounting problems later. |
| 157 | */ |
| 158 | if (!PageDirty(page)) |
| 159 | pr_err("%p invalidatepage %p page not dirty\n", inode, page); |
| 160 | |
Milosz Tanski | b150f5c1 | 2013-08-09 12:59:55 -0400 | [diff] [blame] | 161 | ClearPageChecked(page); |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 162 | |
Milosz Tanski | b150f5c1 | 2013-08-09 12:59:55 -0400 | [diff] [blame] | 163 | dout("%p invalidatepage %p idx %lu full dirty page\n", |
| 164 | inode, page, page->index); |
| 165 | |
| 166 | ceph_put_wrbuffer_cap_refs(ci, 1, snapc); |
| 167 | ceph_put_snap_context(snapc); |
| 168 | page->private = 0; |
| 169 | ClearPagePrivate(page); |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 170 | } |
| 171 | |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 172 | static int ceph_releasepage(struct page *page, gfp_t g) |
| 173 | { |
| 174 | struct inode *inode = page->mapping ? page->mapping->host : NULL; |
| 175 | dout("%p releasepage %p idx %lu\n", inode, page, page->index); |
| 176 | WARN_ON(PageDirty(page)); |
Milosz Tanski | 99ccbd2 | 2013-08-21 17:29:54 -0400 | [diff] [blame] | 177 | |
| 178 | /* Can we release the page from the cache? */ |
| 179 | if (!ceph_release_fscache_page(page, g)) |
| 180 | return 0; |
| 181 | |
| 182 | return !PagePrivate(page); |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 183 | } |
| 184 | |
| 185 | /* |
| 186 | * read a single page, without unlocking it. |
| 187 | */ |
| 188 | static int readpage_nounlock(struct file *filp, struct page *page) |
| 189 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 190 | struct inode *inode = file_inode(filp); |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 191 | struct ceph_inode_info *ci = ceph_inode(inode); |
Milosz Tanski | 99ccbd2 | 2013-08-21 17:29:54 -0400 | [diff] [blame] | 192 | struct ceph_osd_client *osdc = |
Yehuda Sadeh | 3d14c5d | 2010-04-06 15:14:15 -0700 | [diff] [blame] | 193 | &ceph_inode_to_client(inode)->client->osdc; |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 194 | int err = 0; |
Yan, Zheng | 8370124 | 2014-11-14 22:36:18 +0800 | [diff] [blame] | 195 | u64 off = page_offset(page); |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 196 | u64 len = PAGE_CACHE_SIZE; |
| 197 | |
Yan, Zheng | 8370124 | 2014-11-14 22:36:18 +0800 | [diff] [blame] | 198 | if (off >= i_size_read(inode)) { |
Yan, Zheng | fcc02d2 | 2015-01-10 11:43:12 +0800 | [diff] [blame] | 199 | zero_user_segment(page, 0, PAGE_CACHE_SIZE); |
Yan, Zheng | 8370124 | 2014-11-14 22:36:18 +0800 | [diff] [blame] | 200 | SetPageUptodate(page); |
| 201 | return 0; |
| 202 | } |
Milosz Tanski | 99ccbd2 | 2013-08-21 17:29:54 -0400 | [diff] [blame] | 203 | |
Yan, Zheng | fcc02d2 | 2015-01-10 11:43:12 +0800 | [diff] [blame] | 204 | if (ci->i_inline_version != CEPH_INLINE_NONE) { |
| 205 | /* |
| 206 | * Uptodate inline data should have been added |
| 207 | * into page cache while getting Fcr caps. |
| 208 | */ |
| 209 | if (off == 0) |
| 210 | return -EINVAL; |
| 211 | zero_user_segment(page, 0, PAGE_CACHE_SIZE); |
| 212 | SetPageUptodate(page); |
| 213 | return 0; |
| 214 | } |
Yan, Zheng | 8370124 | 2014-11-14 22:36:18 +0800 | [diff] [blame] | 215 | |
| 216 | err = ceph_readpage_from_fscache(inode, page); |
Milosz Tanski | 99ccbd2 | 2013-08-21 17:29:54 -0400 | [diff] [blame] | 217 | if (err == 0) |
| 218 | goto out; |
| 219 | |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 220 | dout("readpage inode %p file %p page %p index %lu\n", |
| 221 | inode, filp, page, page->index); |
| 222 | err = ceph_osdc_readpages(osdc, ceph_vino(inode), &ci->i_layout, |
Yan, Zheng | 8370124 | 2014-11-14 22:36:18 +0800 | [diff] [blame] | 223 | off, &len, |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 224 | ci->i_truncate_seq, ci->i_truncate_size, |
Sage Weil | b7495fc | 2010-11-09 12:43:12 -0800 | [diff] [blame] | 225 | &page, 1, 0); |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 226 | if (err == -ENOENT) |
| 227 | err = 0; |
| 228 | if (err < 0) { |
| 229 | SetPageError(page); |
Li Wang | 1830280 | 2013-12-19 06:03:49 -0800 | [diff] [blame] | 230 | ceph_fscache_readpage_cancel(inode, page); |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 231 | goto out; |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 232 | } |
Zhang Zhen | 23cd573 | 2014-05-28 15:09:55 +0800 | [diff] [blame] | 233 | if (err < PAGE_CACHE_SIZE) |
| 234 | /* zero fill remainder of page */ |
| 235 | zero_user_segment(page, err, PAGE_CACHE_SIZE); |
| 236 | else |
| 237 | flush_dcache_page(page); |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 238 | |
Zhang Zhen | 23cd573 | 2014-05-28 15:09:55 +0800 | [diff] [blame] | 239 | SetPageUptodate(page); |
| 240 | ceph_readpage_to_fscache(inode, page); |
Milosz Tanski | 99ccbd2 | 2013-08-21 17:29:54 -0400 | [diff] [blame] | 241 | |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 242 | out: |
| 243 | return err < 0 ? err : 0; |
| 244 | } |
| 245 | |
| 246 | static int ceph_readpage(struct file *filp, struct page *page) |
| 247 | { |
| 248 | int r = readpage_nounlock(filp, page); |
| 249 | unlock_page(page); |
| 250 | return r; |
| 251 | } |
| 252 | |
| 253 | /* |
Sage Weil | 7c27219 | 2011-08-03 09:58:09 -0700 | [diff] [blame] | 254 | * Finish an async read(ahead) op. |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 255 | */ |
Sage Weil | 7c27219 | 2011-08-03 09:58:09 -0700 | [diff] [blame] | 256 | static void finish_read(struct ceph_osd_request *req, struct ceph_msg *msg) |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 257 | { |
Sage Weil | 7c27219 | 2011-08-03 09:58:09 -0700 | [diff] [blame] | 258 | struct inode *inode = req->r_inode; |
Alex Elder | 87060c1 | 2013-04-03 01:28:58 -0500 | [diff] [blame] | 259 | struct ceph_osd_data *osd_data; |
Sage Weil | 1b83bef | 2013-02-25 16:11:12 -0800 | [diff] [blame] | 260 | int rc = req->r_result; |
| 261 | int bytes = le32_to_cpu(msg->hdr.data_len); |
Alex Elder | e0c5948 | 2013-03-07 15:38:25 -0600 | [diff] [blame] | 262 | int num_pages; |
Sage Weil | 7c27219 | 2011-08-03 09:58:09 -0700 | [diff] [blame] | 263 | int i; |
| 264 | |
Sage Weil | 7c27219 | 2011-08-03 09:58:09 -0700 | [diff] [blame] | 265 | dout("finish_read %p req %p rc %d bytes %d\n", inode, req, rc, bytes); |
| 266 | |
| 267 | /* unlock all pages, zeroing any data we didn't read */ |
Alex Elder | 406e2c9 | 2013-04-15 14:50:36 -0500 | [diff] [blame] | 268 | osd_data = osd_req_op_extent_osd_data(req, 0); |
Alex Elder | 87060c1 | 2013-04-03 01:28:58 -0500 | [diff] [blame] | 269 | BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGES); |
| 270 | num_pages = calc_pages_for((u64)osd_data->alignment, |
| 271 | (u64)osd_data->length); |
Alex Elder | e0c5948 | 2013-03-07 15:38:25 -0600 | [diff] [blame] | 272 | for (i = 0; i < num_pages; i++) { |
Alex Elder | 87060c1 | 2013-04-03 01:28:58 -0500 | [diff] [blame] | 273 | struct page *page = osd_data->pages[i]; |
Sage Weil | 7c27219 | 2011-08-03 09:58:09 -0700 | [diff] [blame] | 274 | |
Li Wang | f36132a | 2013-11-27 22:28:13 +0800 | [diff] [blame] | 275 | if (rc < 0) |
| 276 | goto unlock; |
Sage Weil | 7c27219 | 2011-08-03 09:58:09 -0700 | [diff] [blame] | 277 | if (bytes < (int)PAGE_CACHE_SIZE) { |
| 278 | /* zero (remainder of) page */ |
| 279 | int s = bytes < 0 ? 0 : bytes; |
| 280 | zero_user_segment(page, s, PAGE_CACHE_SIZE); |
| 281 | } |
| 282 | dout("finish_read %p uptodate %p idx %lu\n", inode, page, |
| 283 | page->index); |
| 284 | flush_dcache_page(page); |
| 285 | SetPageUptodate(page); |
Milosz Tanski | 99ccbd2 | 2013-08-21 17:29:54 -0400 | [diff] [blame] | 286 | ceph_readpage_to_fscache(inode, page); |
Li Wang | f36132a | 2013-11-27 22:28:13 +0800 | [diff] [blame] | 287 | unlock: |
Sage Weil | 7c27219 | 2011-08-03 09:58:09 -0700 | [diff] [blame] | 288 | unlock_page(page); |
| 289 | page_cache_release(page); |
Alex Elder | 0fff87e | 2013-02-14 12:16:43 -0600 | [diff] [blame] | 290 | bytes -= PAGE_CACHE_SIZE; |
Sage Weil | 7c27219 | 2011-08-03 09:58:09 -0700 | [diff] [blame] | 291 | } |
Alex Elder | 87060c1 | 2013-04-03 01:28:58 -0500 | [diff] [blame] | 292 | kfree(osd_data->pages); |
Sage Weil | 7c27219 | 2011-08-03 09:58:09 -0700 | [diff] [blame] | 293 | } |
| 294 | |
David Zafman | 8884d53 | 2012-12-03 19:14:05 -0800 | [diff] [blame] | 295 | static void ceph_unlock_page_vector(struct page **pages, int num_pages) |
| 296 | { |
| 297 | int i; |
| 298 | |
| 299 | for (i = 0; i < num_pages; i++) |
| 300 | unlock_page(pages[i]); |
| 301 | } |
| 302 | |
Sage Weil | 7c27219 | 2011-08-03 09:58:09 -0700 | [diff] [blame] | 303 | /* |
| 304 | * start an async read(ahead) operation. return nr_pages we submitted |
| 305 | * a read for on success, or negative error code. |
| 306 | */ |
Sage Weil | 0d66a48 | 2011-08-04 08:21:30 -0700 | [diff] [blame] | 307 | static int start_read(struct inode *inode, struct list_head *page_list, int max) |
Sage Weil | 7c27219 | 2011-08-03 09:58:09 -0700 | [diff] [blame] | 308 | { |
| 309 | struct ceph_osd_client *osdc = |
| 310 | &ceph_inode_to_client(inode)->client->osdc; |
| 311 | struct ceph_inode_info *ci = ceph_inode(inode); |
| 312 | struct page *page = list_entry(page_list->prev, struct page, lru); |
Alex Elder | acead00 | 2013-03-14 14:09:05 -0500 | [diff] [blame] | 313 | struct ceph_vino vino; |
Sage Weil | 7c27219 | 2011-08-03 09:58:09 -0700 | [diff] [blame] | 314 | struct ceph_osd_request *req; |
| 315 | u64 off; |
| 316 | u64 len; |
| 317 | int i; |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 318 | struct page **pages; |
Sage Weil | 7c27219 | 2011-08-03 09:58:09 -0700 | [diff] [blame] | 319 | pgoff_t next_index; |
| 320 | int nr_pages = 0; |
| 321 | int ret; |
| 322 | |
Alex Elder | 6285bc2 | 2012-10-02 10:25:51 -0500 | [diff] [blame] | 323 | off = (u64) page_offset(page); |
Sage Weil | 7c27219 | 2011-08-03 09:58:09 -0700 | [diff] [blame] | 324 | |
| 325 | /* count pages */ |
| 326 | next_index = page->index; |
| 327 | list_for_each_entry_reverse(page, page_list, lru) { |
| 328 | if (page->index != next_index) |
| 329 | break; |
| 330 | nr_pages++; |
| 331 | next_index++; |
Sage Weil | 0d66a48 | 2011-08-04 08:21:30 -0700 | [diff] [blame] | 332 | if (max && nr_pages == max) |
| 333 | break; |
Sage Weil | 7c27219 | 2011-08-03 09:58:09 -0700 | [diff] [blame] | 334 | } |
| 335 | len = nr_pages << PAGE_CACHE_SHIFT; |
| 336 | dout("start_read %p nr_pages %d is %lld~%lld\n", inode, nr_pages, |
| 337 | off, len); |
Alex Elder | acead00 | 2013-03-14 14:09:05 -0500 | [diff] [blame] | 338 | vino = ceph_vino(inode); |
| 339 | req = ceph_osdc_new_request(osdc, &ci->i_layout, vino, off, &len, |
Yan, Zheng | 715e4cd | 2014-11-13 14:40:37 +0800 | [diff] [blame] | 340 | 0, 1, CEPH_OSD_OP_READ, |
Alex Elder | acead00 | 2013-03-14 14:09:05 -0500 | [diff] [blame] | 341 | CEPH_OSD_FLAG_READ, NULL, |
Sage Weil | 7c27219 | 2011-08-03 09:58:09 -0700 | [diff] [blame] | 342 | ci->i_truncate_seq, ci->i_truncate_size, |
Alex Elder | acead00 | 2013-03-14 14:09:05 -0500 | [diff] [blame] | 343 | false); |
Sage Weil | 6816282 | 2012-09-24 21:01:02 -0700 | [diff] [blame] | 344 | if (IS_ERR(req)) |
| 345 | return PTR_ERR(req); |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 346 | |
| 347 | /* build page vector */ |
Alex Elder | cf7b7e1 | 2013-03-01 18:00:15 -0600 | [diff] [blame] | 348 | nr_pages = calc_pages_for(0, len); |
Sage Weil | 7c27219 | 2011-08-03 09:58:09 -0700 | [diff] [blame] | 349 | pages = kmalloc(sizeof(*pages) * nr_pages, GFP_NOFS); |
| 350 | ret = -ENOMEM; |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 351 | if (!pages) |
Sage Weil | 7c27219 | 2011-08-03 09:58:09 -0700 | [diff] [blame] | 352 | goto out; |
| 353 | for (i = 0; i < nr_pages; ++i) { |
| 354 | page = list_entry(page_list->prev, struct page, lru); |
| 355 | BUG_ON(PageLocked(page)); |
| 356 | list_del(&page->lru); |
Milosz Tanski | 99ccbd2 | 2013-08-21 17:29:54 -0400 | [diff] [blame] | 357 | |
Sage Weil | 7c27219 | 2011-08-03 09:58:09 -0700 | [diff] [blame] | 358 | dout("start_read %p adding %p idx %lu\n", inode, page, |
| 359 | page->index); |
| 360 | if (add_to_page_cache_lru(page, &inode->i_data, page->index, |
| 361 | GFP_NOFS)) { |
Milosz Tanski | d4d3aa3 | 2013-09-03 19:11:17 -0400 | [diff] [blame] | 362 | ceph_fscache_uncache_page(inode, page); |
Sage Weil | 7c27219 | 2011-08-03 09:58:09 -0700 | [diff] [blame] | 363 | page_cache_release(page); |
| 364 | dout("start_read %p add_to_page_cache failed %p\n", |
| 365 | inode, page); |
| 366 | nr_pages = i; |
| 367 | goto out_pages; |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 368 | } |
Sage Weil | 7c27219 | 2011-08-03 09:58:09 -0700 | [diff] [blame] | 369 | pages[i] = page; |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 370 | } |
Alex Elder | 406e2c9 | 2013-04-15 14:50:36 -0500 | [diff] [blame] | 371 | osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0, false, false); |
Sage Weil | 7c27219 | 2011-08-03 09:58:09 -0700 | [diff] [blame] | 372 | req->r_callback = finish_read; |
| 373 | req->r_inode = inode; |
| 374 | |
Alex Elder | 7952873 | 2013-04-03 21:32:51 -0500 | [diff] [blame] | 375 | ceph_osdc_build_request(req, off, NULL, vino.snap, NULL); |
Alex Elder | 02ee07d | 2013-03-14 14:09:06 -0500 | [diff] [blame] | 376 | |
Sage Weil | 7c27219 | 2011-08-03 09:58:09 -0700 | [diff] [blame] | 377 | dout("start_read %p starting %p %lld~%lld\n", inode, req, off, len); |
| 378 | ret = ceph_osdc_start_request(osdc, req, false); |
| 379 | if (ret < 0) |
| 380 | goto out_pages; |
| 381 | ceph_osdc_put_request(req); |
| 382 | return nr_pages; |
| 383 | |
| 384 | out_pages: |
David Zafman | 8884d53 | 2012-12-03 19:14:05 -0800 | [diff] [blame] | 385 | ceph_unlock_page_vector(pages, nr_pages); |
Sage Weil | 7c27219 | 2011-08-03 09:58:09 -0700 | [diff] [blame] | 386 | ceph_release_page_vector(pages, nr_pages); |
Sage Weil | 7c27219 | 2011-08-03 09:58:09 -0700 | [diff] [blame] | 387 | out: |
| 388 | ceph_osdc_put_request(req); |
| 389 | return ret; |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 390 | } |
| 391 | |
Sage Weil | 7c27219 | 2011-08-03 09:58:09 -0700 | [diff] [blame] | 392 | |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 393 | /* |
| 394 | * Read multiple pages. Leave pages we don't read + unlock in page_list; |
| 395 | * the caller (VM) cleans them up. |
| 396 | */ |
| 397 | static int ceph_readpages(struct file *file, struct address_space *mapping, |
| 398 | struct list_head *page_list, unsigned nr_pages) |
| 399 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 400 | struct inode *inode = file_inode(file); |
Sage Weil | 0d66a48 | 2011-08-04 08:21:30 -0700 | [diff] [blame] | 401 | struct ceph_fs_client *fsc = ceph_inode_to_client(inode); |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 402 | int rc = 0; |
Sage Weil | 0d66a48 | 2011-08-04 08:21:30 -0700 | [diff] [blame] | 403 | int max = 0; |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 404 | |
Yan, Zheng | 8370124 | 2014-11-14 22:36:18 +0800 | [diff] [blame] | 405 | if (ceph_inode(inode)->i_inline_version != CEPH_INLINE_NONE) |
| 406 | return -EINVAL; |
| 407 | |
Milosz Tanski | 99ccbd2 | 2013-08-21 17:29:54 -0400 | [diff] [blame] | 408 | rc = ceph_readpages_from_fscache(mapping->host, mapping, page_list, |
| 409 | &nr_pages); |
| 410 | |
| 411 | if (rc == 0) |
| 412 | goto out; |
| 413 | |
Sage Weil | 0d66a48 | 2011-08-04 08:21:30 -0700 | [diff] [blame] | 414 | if (fsc->mount_options->rsize >= PAGE_CACHE_SIZE) |
| 415 | max = (fsc->mount_options->rsize + PAGE_CACHE_SIZE - 1) |
| 416 | >> PAGE_SHIFT; |
| 417 | |
Alex Elder | 2794a82 | 2013-02-14 12:16:43 -0600 | [diff] [blame] | 418 | dout("readpages %p file %p nr_pages %d max %d\n", inode, |
| 419 | file, nr_pages, |
Sage Weil | 0d66a48 | 2011-08-04 08:21:30 -0700 | [diff] [blame] | 420 | max); |
Sage Weil | 7c27219 | 2011-08-03 09:58:09 -0700 | [diff] [blame] | 421 | while (!list_empty(page_list)) { |
Sage Weil | 0d66a48 | 2011-08-04 08:21:30 -0700 | [diff] [blame] | 422 | rc = start_read(inode, page_list, max); |
Sage Weil | 7c27219 | 2011-08-03 09:58:09 -0700 | [diff] [blame] | 423 | if (rc < 0) |
| 424 | goto out; |
| 425 | BUG_ON(rc == 0); |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 426 | } |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 427 | out: |
Milosz Tanski | 76be778 | 2013-08-21 17:30:27 -0400 | [diff] [blame] | 428 | ceph_fscache_readpages_cancel(inode, page_list); |
| 429 | |
Sage Weil | 7c27219 | 2011-08-03 09:58:09 -0700 | [diff] [blame] | 430 | dout("readpages %p file %p ret %d\n", inode, file, rc); |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 431 | return rc; |
| 432 | } |
| 433 | |
| 434 | /* |
| 435 | * Get ref for the oldest snapc for an inode with dirty data... that is, the |
| 436 | * only snap context we are allowed to write back. |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 437 | */ |
Sage Weil | 6298a33 | 2010-03-31 22:01:38 -0700 | [diff] [blame] | 438 | static struct ceph_snap_context *get_oldest_context(struct inode *inode, |
| 439 | u64 *snap_size) |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 440 | { |
| 441 | struct ceph_inode_info *ci = ceph_inode(inode); |
| 442 | struct ceph_snap_context *snapc = NULL; |
| 443 | struct ceph_cap_snap *capsnap = NULL; |
| 444 | |
Sage Weil | be65559 | 2011-11-30 09:47:09 -0800 | [diff] [blame] | 445 | spin_lock(&ci->i_ceph_lock); |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 446 | list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) { |
| 447 | dout(" cap_snap %p snapc %p has %d dirty pages\n", capsnap, |
| 448 | capsnap->context, capsnap->dirty_pages); |
| 449 | if (capsnap->dirty_pages) { |
| 450 | snapc = ceph_get_snap_context(capsnap->context); |
| 451 | if (snap_size) |
| 452 | *snap_size = capsnap->size; |
| 453 | break; |
| 454 | } |
| 455 | } |
Sage Weil | 7d8cb26 | 2010-08-24 08:44:16 -0700 | [diff] [blame] | 456 | if (!snapc && ci->i_wrbuffer_ref_head) { |
Sage Weil | 80e755f | 2010-03-31 21:52:10 -0700 | [diff] [blame] | 457 | snapc = ceph_get_snap_context(ci->i_head_snapc); |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 458 | dout(" head snapc %p has %d dirty pages\n", |
| 459 | snapc, ci->i_wrbuffer_ref_head); |
| 460 | } |
Sage Weil | be65559 | 2011-11-30 09:47:09 -0800 | [diff] [blame] | 461 | spin_unlock(&ci->i_ceph_lock); |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 462 | return snapc; |
| 463 | } |
| 464 | |
| 465 | /* |
| 466 | * Write a single page, but leave the page locked. |
| 467 | * |
| 468 | * If we get a write error, set the page error bit, but still adjust the |
| 469 | * dirty page accounting (i.e., page is no longer dirty). |
| 470 | */ |
| 471 | static int writepage_nounlock(struct page *page, struct writeback_control *wbc) |
| 472 | { |
| 473 | struct inode *inode; |
| 474 | struct ceph_inode_info *ci; |
Yehuda Sadeh | 3d14c5d | 2010-04-06 15:14:15 -0700 | [diff] [blame] | 475 | struct ceph_fs_client *fsc; |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 476 | struct ceph_osd_client *osdc; |
Sage Weil | 6298a33 | 2010-03-31 22:01:38 -0700 | [diff] [blame] | 477 | struct ceph_snap_context *snapc, *oldest; |
Yan, Zheng | fc2744a | 2013-05-31 16:48:29 +0800 | [diff] [blame] | 478 | loff_t page_off = page_offset(page); |
Yehuda Sadeh | 2baba25 | 2009-12-18 13:51:57 -0800 | [diff] [blame] | 479 | long writeback_stat; |
Yan, Zheng | fc2744a | 2013-05-31 16:48:29 +0800 | [diff] [blame] | 480 | u64 truncate_size, snap_size = 0; |
| 481 | u32 truncate_seq; |
| 482 | int err = 0, len = PAGE_CACHE_SIZE; |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 483 | |
| 484 | dout("writepage %p idx %lu\n", page, page->index); |
| 485 | |
| 486 | if (!page->mapping || !page->mapping->host) { |
| 487 | dout("writepage %p - no mapping\n", page); |
| 488 | return -EFAULT; |
| 489 | } |
| 490 | inode = page->mapping->host; |
| 491 | ci = ceph_inode(inode); |
Yehuda Sadeh | 3d14c5d | 2010-04-06 15:14:15 -0700 | [diff] [blame] | 492 | fsc = ceph_inode_to_client(inode); |
| 493 | osdc = &fsc->client->osdc; |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 494 | |
| 495 | /* verify this is a writeable snap context */ |
Yan, Zheng | 61600ef | 2012-05-28 14:44:30 +0800 | [diff] [blame] | 496 | snapc = page_snap_context(page); |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 497 | if (snapc == NULL) { |
| 498 | dout("writepage %p page %p not dirty?\n", inode, page); |
| 499 | goto out; |
| 500 | } |
Sage Weil | 6298a33 | 2010-03-31 22:01:38 -0700 | [diff] [blame] | 501 | oldest = get_oldest_context(inode, &snap_size); |
| 502 | if (snapc->seq > oldest->seq) { |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 503 | dout("writepage %p page %p snapc %p not writeable - noop\n", |
Yan, Zheng | 61600ef | 2012-05-28 14:44:30 +0800 | [diff] [blame] | 504 | inode, page, snapc); |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 505 | /* we should only noop if called by kswapd */ |
| 506 | WARN_ON((current->flags & PF_MEMALLOC) == 0); |
Sage Weil | 6298a33 | 2010-03-31 22:01:38 -0700 | [diff] [blame] | 507 | ceph_put_snap_context(oldest); |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 508 | goto out; |
| 509 | } |
Sage Weil | 6298a33 | 2010-03-31 22:01:38 -0700 | [diff] [blame] | 510 | ceph_put_snap_context(oldest); |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 511 | |
Yan, Zheng | fc2744a | 2013-05-31 16:48:29 +0800 | [diff] [blame] | 512 | spin_lock(&ci->i_ceph_lock); |
| 513 | truncate_seq = ci->i_truncate_seq; |
| 514 | truncate_size = ci->i_truncate_size; |
| 515 | if (!snap_size) |
| 516 | snap_size = i_size_read(inode); |
| 517 | spin_unlock(&ci->i_ceph_lock); |
| 518 | |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 519 | /* is this a partial page at end of file? */ |
Yan, Zheng | fc2744a | 2013-05-31 16:48:29 +0800 | [diff] [blame] | 520 | if (page_off >= snap_size) { |
| 521 | dout("%p page eof %llu\n", page, snap_size); |
| 522 | goto out; |
| 523 | } |
| 524 | if (snap_size < page_off + len) |
| 525 | len = snap_size - page_off; |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 526 | |
Sage Weil | ae00d4f | 2010-09-16 16:26:51 -0700 | [diff] [blame] | 527 | dout("writepage %p page %p index %lu on %llu~%u snapc %p\n", |
| 528 | inode, page, page->index, page_off, len, snapc); |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 529 | |
Yehuda Sadeh | 3d14c5d | 2010-04-06 15:14:15 -0700 | [diff] [blame] | 530 | writeback_stat = atomic_long_inc_return(&fsc->writeback_count); |
Yehuda Sadeh | 2baba25 | 2009-12-18 13:51:57 -0800 | [diff] [blame] | 531 | if (writeback_stat > |
Yehuda Sadeh | 3d14c5d | 2010-04-06 15:14:15 -0700 | [diff] [blame] | 532 | CONGESTION_ON_THRESH(fsc->mount_options->congestion_kb)) |
| 533 | set_bdi_congested(&fsc->backing_dev_info, BLK_RW_ASYNC); |
Yehuda Sadeh | 2baba25 | 2009-12-18 13:51:57 -0800 | [diff] [blame] | 534 | |
Milosz Tanski | 99ccbd2 | 2013-08-21 17:29:54 -0400 | [diff] [blame] | 535 | ceph_readpage_to_fscache(inode, page); |
| 536 | |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 537 | set_page_writeback(page); |
| 538 | err = ceph_osdc_writepages(osdc, ceph_vino(inode), |
| 539 | &ci->i_layout, snapc, |
| 540 | page_off, len, |
Yan, Zheng | fc2744a | 2013-05-31 16:48:29 +0800 | [diff] [blame] | 541 | truncate_seq, truncate_size, |
Alex Elder | 2480882 | 2013-02-15 11:42:29 -0600 | [diff] [blame] | 542 | &inode->i_mtime, &page, 1); |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 543 | if (err < 0) { |
| 544 | dout("writepage setting page/mapping error %d %p\n", err, page); |
| 545 | SetPageError(page); |
| 546 | mapping_set_error(&inode->i_data, err); |
| 547 | if (wbc) |
| 548 | wbc->pages_skipped++; |
| 549 | } else { |
| 550 | dout("writepage cleaned page %p\n", page); |
| 551 | err = 0; /* vfs expects us to return 0 */ |
| 552 | } |
| 553 | page->private = 0; |
| 554 | ClearPagePrivate(page); |
| 555 | end_page_writeback(page); |
| 556 | ceph_put_wrbuffer_cap_refs(ci, 1, snapc); |
Sage Weil | 6298a33 | 2010-03-31 22:01:38 -0700 | [diff] [blame] | 557 | ceph_put_snap_context(snapc); /* page's reference */ |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 558 | out: |
| 559 | return err; |
| 560 | } |
| 561 | |
| 562 | static int ceph_writepage(struct page *page, struct writeback_control *wbc) |
| 563 | { |
Yehuda Sadeh | dbd646a | 2009-12-16 14:51:06 -0800 | [diff] [blame] | 564 | int err; |
| 565 | struct inode *inode = page->mapping->host; |
| 566 | BUG_ON(!inode); |
Sage Weil | 70b666c | 2011-05-27 09:24:26 -0700 | [diff] [blame] | 567 | ihold(inode); |
Yehuda Sadeh | dbd646a | 2009-12-16 14:51:06 -0800 | [diff] [blame] | 568 | err = writepage_nounlock(page, wbc); |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 569 | unlock_page(page); |
Yehuda Sadeh | dbd646a | 2009-12-16 14:51:06 -0800 | [diff] [blame] | 570 | iput(inode); |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 571 | return err; |
| 572 | } |
| 573 | |
| 574 | |
| 575 | /* |
| 576 | * lame release_pages helper. release_pages() isn't exported to |
| 577 | * modules. |
| 578 | */ |
| 579 | static void ceph_release_pages(struct page **pages, int num) |
| 580 | { |
| 581 | struct pagevec pvec; |
| 582 | int i; |
| 583 | |
| 584 | pagevec_init(&pvec, 0); |
| 585 | for (i = 0; i < num; i++) { |
| 586 | if (pagevec_add(&pvec, pages[i]) == 0) |
| 587 | pagevec_release(&pvec); |
| 588 | } |
| 589 | pagevec_release(&pvec); |
| 590 | } |
| 591 | |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 592 | /* |
| 593 | * async writeback completion handler. |
| 594 | * |
| 595 | * If we get an error, set the mapping error bit, but not the individual |
| 596 | * page error bits. |
| 597 | */ |
| 598 | static void writepages_finish(struct ceph_osd_request *req, |
| 599 | struct ceph_msg *msg) |
| 600 | { |
| 601 | struct inode *inode = req->r_inode; |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 602 | struct ceph_inode_info *ci = ceph_inode(inode); |
Alex Elder | 87060c1 | 2013-04-03 01:28:58 -0500 | [diff] [blame] | 603 | struct ceph_osd_data *osd_data; |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 604 | unsigned wrote; |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 605 | struct page *page; |
Alex Elder | e0c5948 | 2013-03-07 15:38:25 -0600 | [diff] [blame] | 606 | int num_pages; |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 607 | int i; |
| 608 | struct ceph_snap_context *snapc = req->r_snapc; |
| 609 | struct address_space *mapping = inode->i_mapping; |
Sage Weil | 1b83bef | 2013-02-25 16:11:12 -0800 | [diff] [blame] | 610 | int rc = req->r_result; |
Alex Elder | 7952873 | 2013-04-03 21:32:51 -0500 | [diff] [blame] | 611 | u64 bytes = req->r_ops[0].extent.length; |
Yehuda Sadeh | 3d14c5d | 2010-04-06 15:14:15 -0700 | [diff] [blame] | 612 | struct ceph_fs_client *fsc = ceph_inode_to_client(inode); |
Yehuda Sadeh | 2baba25 | 2009-12-18 13:51:57 -0800 | [diff] [blame] | 613 | long writeback_stat; |
Sage Weil | 7ff899d | 2010-04-23 10:25:33 -0700 | [diff] [blame] | 614 | unsigned issued = ceph_caps_issued(ci); |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 615 | |
Alex Elder | 406e2c9 | 2013-04-15 14:50:36 -0500 | [diff] [blame] | 616 | osd_data = osd_req_op_extent_osd_data(req, 0); |
Alex Elder | 87060c1 | 2013-04-03 01:28:58 -0500 | [diff] [blame] | 617 | BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGES); |
| 618 | num_pages = calc_pages_for((u64)osd_data->alignment, |
| 619 | (u64)osd_data->length); |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 620 | if (rc >= 0) { |
Sage Weil | 79788c6 | 2010-02-02 16:34:04 -0800 | [diff] [blame] | 621 | /* |
| 622 | * Assume we wrote the pages we originally sent. The |
| 623 | * osd might reply with fewer pages if our writeback |
| 624 | * raced with a truncation and was adjusted at the osd, |
| 625 | * so don't believe the reply. |
| 626 | */ |
Alex Elder | e0c5948 | 2013-03-07 15:38:25 -0600 | [diff] [blame] | 627 | wrote = num_pages; |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 628 | } else { |
| 629 | wrote = 0; |
| 630 | mapping_set_error(mapping, rc); |
| 631 | } |
| 632 | dout("writepages_finish %p rc %d bytes %llu wrote %d (pages)\n", |
| 633 | inode, rc, bytes, wrote); |
| 634 | |
| 635 | /* clean all pages */ |
Alex Elder | e0c5948 | 2013-03-07 15:38:25 -0600 | [diff] [blame] | 636 | for (i = 0; i < num_pages; i++) { |
Alex Elder | 87060c1 | 2013-04-03 01:28:58 -0500 | [diff] [blame] | 637 | page = osd_data->pages[i]; |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 638 | BUG_ON(!page); |
| 639 | WARN_ON(!PageUptodate(page)); |
| 640 | |
Yehuda Sadeh | 2baba25 | 2009-12-18 13:51:57 -0800 | [diff] [blame] | 641 | writeback_stat = |
Yehuda Sadeh | 3d14c5d | 2010-04-06 15:14:15 -0700 | [diff] [blame] | 642 | atomic_long_dec_return(&fsc->writeback_count); |
Yehuda Sadeh | 2baba25 | 2009-12-18 13:51:57 -0800 | [diff] [blame] | 643 | if (writeback_stat < |
Yehuda Sadeh | 3d14c5d | 2010-04-06 15:14:15 -0700 | [diff] [blame] | 644 | CONGESTION_OFF_THRESH(fsc->mount_options->congestion_kb)) |
| 645 | clear_bdi_congested(&fsc->backing_dev_info, |
Yehuda Sadeh | 2baba25 | 2009-12-18 13:51:57 -0800 | [diff] [blame] | 646 | BLK_RW_ASYNC); |
| 647 | |
Yan, Zheng | 61600ef | 2012-05-28 14:44:30 +0800 | [diff] [blame] | 648 | ceph_put_snap_context(page_snap_context(page)); |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 649 | page->private = 0; |
| 650 | ClearPagePrivate(page); |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 651 | dout("unlocking %d %p\n", i, page); |
| 652 | end_page_writeback(page); |
Yehuda Sadeh | e63dc5c | 2010-02-19 00:07:01 +0000 | [diff] [blame] | 653 | |
| 654 | /* |
| 655 | * We lost the cache cap, need to truncate the page before |
| 656 | * it is unlocked, otherwise we'd truncate it later in the |
| 657 | * page truncation thread, possibly losing some data that |
| 658 | * raced its way in |
| 659 | */ |
Sage Weil | 2962507 | 2010-05-27 10:40:43 -0700 | [diff] [blame] | 660 | if ((issued & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0) |
Yehuda Sadeh | e63dc5c | 2010-02-19 00:07:01 +0000 | [diff] [blame] | 661 | generic_error_remove_page(inode->i_mapping, page); |
| 662 | |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 663 | unlock_page(page); |
| 664 | } |
| 665 | dout("%p wrote+cleaned %d pages\n", inode, wrote); |
Alex Elder | e0c5948 | 2013-03-07 15:38:25 -0600 | [diff] [blame] | 666 | ceph_put_wrbuffer_cap_refs(ci, num_pages, snapc); |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 667 | |
Alex Elder | 87060c1 | 2013-04-03 01:28:58 -0500 | [diff] [blame] | 668 | ceph_release_pages(osd_data->pages, num_pages); |
| 669 | if (osd_data->pages_from_pool) |
| 670 | mempool_free(osd_data->pages, |
Cheng Renquan | 640ef79 | 2010-03-26 17:40:33 +0800 | [diff] [blame] | 671 | ceph_sb_to_client(inode->i_sb)->wb_pagevec_pool); |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 672 | else |
Alex Elder | 87060c1 | 2013-04-03 01:28:58 -0500 | [diff] [blame] | 673 | kfree(osd_data->pages); |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 674 | ceph_osdc_put_request(req); |
| 675 | } |
| 676 | |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 677 | /* |
| 678 | * initiate async writeback |
| 679 | */ |
| 680 | static int ceph_writepages_start(struct address_space *mapping, |
| 681 | struct writeback_control *wbc) |
| 682 | { |
| 683 | struct inode *inode = mapping->host; |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 684 | struct ceph_inode_info *ci = ceph_inode(inode); |
Yan, Zheng | fc2744a | 2013-05-31 16:48:29 +0800 | [diff] [blame] | 685 | struct ceph_fs_client *fsc = ceph_inode_to_client(inode); |
| 686 | struct ceph_vino vino = ceph_vino(inode); |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 687 | pgoff_t index, start, end; |
| 688 | int range_whole = 0; |
| 689 | int should_loop = 1; |
| 690 | pgoff_t max_pages = 0, max_pages_ever = 0; |
Sage Weil | 80e755f | 2010-03-31 21:52:10 -0700 | [diff] [blame] | 691 | struct ceph_snap_context *snapc = NULL, *last_snapc = NULL, *pgsnapc; |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 692 | struct pagevec pvec; |
| 693 | int done = 0; |
| 694 | int rc = 0; |
| 695 | unsigned wsize = 1 << inode->i_blkbits; |
| 696 | struct ceph_osd_request *req = NULL; |
Dan Carpenter | 021b77b | 2014-11-28 11:33:34 +0300 | [diff] [blame] | 697 | int do_sync = 0; |
Yan, Zheng | fc2744a | 2013-05-31 16:48:29 +0800 | [diff] [blame] | 698 | u64 truncate_size, snap_size; |
| 699 | u32 truncate_seq; |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 700 | |
| 701 | /* |
| 702 | * Include a 'sync' in the OSD request if this is a data |
| 703 | * integrity write (e.g., O_SYNC write or fsync()), or if our |
| 704 | * cap is being revoked. |
| 705 | */ |
majianpeng | c62988e | 2013-06-19 15:12:06 +0800 | [diff] [blame] | 706 | if ((wbc->sync_mode == WB_SYNC_ALL) || |
| 707 | ceph_caps_revoking(ci, CEPH_CAP_FILE_BUFFER)) |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 708 | do_sync = 1; |
| 709 | dout("writepages_start %p dosync=%d (mode=%s)\n", |
| 710 | inode, do_sync, |
| 711 | wbc->sync_mode == WB_SYNC_NONE ? "NONE" : |
| 712 | (wbc->sync_mode == WB_SYNC_ALL ? "ALL" : "HOLD")); |
| 713 | |
Yehuda Sadeh | 3d14c5d | 2010-04-06 15:14:15 -0700 | [diff] [blame] | 714 | if (fsc->mount_state == CEPH_MOUNT_SHUTDOWN) { |
Fabian Frederick | f3ae1b9 | 2014-06-06 14:35:37 -0700 | [diff] [blame] | 715 | pr_warn("writepage_start %p on forced umount\n", inode); |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 716 | return -EIO; /* we're in a forced umount, don't write! */ |
| 717 | } |
Yehuda Sadeh | 3d14c5d | 2010-04-06 15:14:15 -0700 | [diff] [blame] | 718 | if (fsc->mount_options->wsize && fsc->mount_options->wsize < wsize) |
| 719 | wsize = fsc->mount_options->wsize; |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 720 | if (wsize < PAGE_CACHE_SIZE) |
| 721 | wsize = PAGE_CACHE_SIZE; |
| 722 | max_pages_ever = wsize >> PAGE_CACHE_SHIFT; |
| 723 | |
| 724 | pagevec_init(&pvec, 0); |
| 725 | |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 726 | /* where to start/end? */ |
| 727 | if (wbc->range_cyclic) { |
| 728 | start = mapping->writeback_index; /* Start from prev offset */ |
| 729 | end = -1; |
| 730 | dout(" cyclic, start at %lu\n", start); |
| 731 | } else { |
| 732 | start = wbc->range_start >> PAGE_CACHE_SHIFT; |
| 733 | end = wbc->range_end >> PAGE_CACHE_SHIFT; |
| 734 | if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) |
| 735 | range_whole = 1; |
| 736 | should_loop = 0; |
| 737 | dout(" not cyclic, %lu to %lu\n", start, end); |
| 738 | } |
| 739 | index = start; |
| 740 | |
| 741 | retry: |
| 742 | /* find oldest snap context with dirty data */ |
| 743 | ceph_put_snap_context(snapc); |
Yan, Zheng | 1ac0fc8 | 2013-04-12 21:45:42 +0800 | [diff] [blame] | 744 | snap_size = 0; |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 745 | snapc = get_oldest_context(inode, &snap_size); |
| 746 | if (!snapc) { |
| 747 | /* hmm, why does writepages get called when there |
| 748 | is no dirty data? */ |
| 749 | dout(" no snap context with dirty data?\n"); |
| 750 | goto out; |
| 751 | } |
Yan, Zheng | 1ac0fc8 | 2013-04-12 21:45:42 +0800 | [diff] [blame] | 752 | if (snap_size == 0) |
| 753 | snap_size = i_size_read(inode); |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 754 | dout(" oldest snapc is %p seq %lld (%d snaps)\n", |
| 755 | snapc, snapc->seq, snapc->num_snaps); |
Yan, Zheng | fc2744a | 2013-05-31 16:48:29 +0800 | [diff] [blame] | 756 | |
| 757 | spin_lock(&ci->i_ceph_lock); |
| 758 | truncate_seq = ci->i_truncate_seq; |
| 759 | truncate_size = ci->i_truncate_size; |
| 760 | if (!snap_size) |
| 761 | snap_size = i_size_read(inode); |
| 762 | spin_unlock(&ci->i_ceph_lock); |
| 763 | |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 764 | if (last_snapc && snapc != last_snapc) { |
| 765 | /* if we switched to a newer snapc, restart our scan at the |
| 766 | * start of the original file range. */ |
| 767 | dout(" snapc differs from last pass, restarting at %lu\n", |
| 768 | index); |
| 769 | index = start; |
| 770 | } |
| 771 | last_snapc = snapc; |
| 772 | |
| 773 | while (!done && index <= end) { |
| 774 | unsigned i; |
| 775 | int first; |
| 776 | pgoff_t next; |
| 777 | int pvec_pages, locked_pages; |
Alex Elder | e5975c7 | 2013-03-14 14:09:05 -0500 | [diff] [blame] | 778 | struct page **pages = NULL; |
| 779 | mempool_t *pool = NULL; /* Becomes non-null if mempool used */ |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 780 | struct page *page; |
| 781 | int want; |
| 782 | u64 offset, len; |
Yehuda Sadeh | 2baba25 | 2009-12-18 13:51:57 -0800 | [diff] [blame] | 783 | long writeback_stat; |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 784 | |
| 785 | next = 0; |
| 786 | locked_pages = 0; |
| 787 | max_pages = max_pages_ever; |
| 788 | |
| 789 | get_more_pages: |
| 790 | first = -1; |
| 791 | want = min(end - index, |
| 792 | min((pgoff_t)PAGEVEC_SIZE, |
| 793 | max_pages - (pgoff_t)locked_pages) - 1) |
| 794 | + 1; |
| 795 | pvec_pages = pagevec_lookup_tag(&pvec, mapping, &index, |
| 796 | PAGECACHE_TAG_DIRTY, |
| 797 | want); |
| 798 | dout("pagevec_lookup_tag got %d\n", pvec_pages); |
| 799 | if (!pvec_pages && !locked_pages) |
| 800 | break; |
| 801 | for (i = 0; i < pvec_pages && locked_pages < max_pages; i++) { |
| 802 | page = pvec.pages[i]; |
| 803 | dout("? %p idx %lu\n", page, page->index); |
| 804 | if (locked_pages == 0) |
| 805 | lock_page(page); /* first page */ |
| 806 | else if (!trylock_page(page)) |
| 807 | break; |
| 808 | |
| 809 | /* only dirty pages, or our accounting breaks */ |
| 810 | if (unlikely(!PageDirty(page)) || |
| 811 | unlikely(page->mapping != mapping)) { |
| 812 | dout("!dirty or !mapping %p\n", page); |
| 813 | unlock_page(page); |
| 814 | break; |
| 815 | } |
| 816 | if (!wbc->range_cyclic && page->index > end) { |
| 817 | dout("end of range %p\n", page); |
| 818 | done = 1; |
| 819 | unlock_page(page); |
| 820 | break; |
| 821 | } |
| 822 | if (next && (page->index != next)) { |
| 823 | dout("not consecutive %p\n", page); |
| 824 | unlock_page(page); |
| 825 | break; |
| 826 | } |
| 827 | if (wbc->sync_mode != WB_SYNC_NONE) { |
| 828 | dout("waiting on writeback %p\n", page); |
| 829 | wait_on_page_writeback(page); |
| 830 | } |
Yan, Zheng | 1ac0fc8 | 2013-04-12 21:45:42 +0800 | [diff] [blame] | 831 | if (page_offset(page) >= snap_size) { |
| 832 | dout("%p page eof %llu\n", page, snap_size); |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 833 | done = 1; |
| 834 | unlock_page(page); |
| 835 | break; |
| 836 | } |
| 837 | if (PageWriteback(page)) { |
| 838 | dout("%p under writeback\n", page); |
| 839 | unlock_page(page); |
| 840 | break; |
| 841 | } |
| 842 | |
| 843 | /* only if matching snap context */ |
Yan, Zheng | 61600ef | 2012-05-28 14:44:30 +0800 | [diff] [blame] | 844 | pgsnapc = page_snap_context(page); |
Sage Weil | 80e755f | 2010-03-31 21:52:10 -0700 | [diff] [blame] | 845 | if (pgsnapc->seq > snapc->seq) { |
| 846 | dout("page snapc %p %lld > oldest %p %lld\n", |
| 847 | pgsnapc, pgsnapc->seq, snapc, snapc->seq); |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 848 | unlock_page(page); |
| 849 | if (!locked_pages) |
| 850 | continue; /* keep looking for snap */ |
| 851 | break; |
| 852 | } |
| 853 | |
| 854 | if (!clear_page_dirty_for_io(page)) { |
| 855 | dout("%p !clear_page_dirty_for_io\n", page); |
| 856 | unlock_page(page); |
| 857 | break; |
| 858 | } |
| 859 | |
Alex Elder | e5975c7 | 2013-03-14 14:09:05 -0500 | [diff] [blame] | 860 | /* |
| 861 | * We have something to write. If this is |
| 862 | * the first locked page this time through, |
| 863 | * allocate an osd request and a page array |
| 864 | * that it will use. |
| 865 | */ |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 866 | if (locked_pages == 0) { |
Alex Elder | e5975c7 | 2013-03-14 14:09:05 -0500 | [diff] [blame] | 867 | BUG_ON(pages); |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 868 | /* prepare async write request */ |
Alex Elder | e5975c7 | 2013-03-14 14:09:05 -0500 | [diff] [blame] | 869 | offset = (u64)page_offset(page); |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 870 | len = wsize; |
Yan, Zheng | fc2744a | 2013-05-31 16:48:29 +0800 | [diff] [blame] | 871 | req = ceph_osdc_new_request(&fsc->client->osdc, |
| 872 | &ci->i_layout, vino, |
Yan, Zheng | 715e4cd | 2014-11-13 14:40:37 +0800 | [diff] [blame] | 873 | offset, &len, 0, |
| 874 | do_sync ? 2 : 1, |
Yan, Zheng | fc2744a | 2013-05-31 16:48:29 +0800 | [diff] [blame] | 875 | CEPH_OSD_OP_WRITE, |
| 876 | CEPH_OSD_FLAG_WRITE | |
| 877 | CEPH_OSD_FLAG_ONDISK, |
| 878 | snapc, truncate_seq, |
| 879 | truncate_size, true); |
Sage Weil | 6816282 | 2012-09-24 21:01:02 -0700 | [diff] [blame] | 880 | if (IS_ERR(req)) { |
| 881 | rc = PTR_ERR(req); |
Henry C Chang | 8c71897 | 2011-05-03 09:45:16 +0000 | [diff] [blame] | 882 | unlock_page(page); |
| 883 | break; |
| 884 | } |
| 885 | |
Yan, Zheng | 715e4cd | 2014-11-13 14:40:37 +0800 | [diff] [blame] | 886 | if (do_sync) |
| 887 | osd_req_op_init(req, 1, CEPH_OSD_OP_STARTSYNC); |
| 888 | |
Alex Elder | 8848695 | 2013-03-14 14:09:05 -0500 | [diff] [blame] | 889 | req->r_callback = writepages_finish; |
| 890 | req->r_inode = inode; |
| 891 | |
| 892 | max_pages = calc_pages_for(0, (u64)len); |
Yan, Zheng | fc2744a | 2013-05-31 16:48:29 +0800 | [diff] [blame] | 893 | pages = kmalloc(max_pages * sizeof (*pages), |
| 894 | GFP_NOFS); |
Alex Elder | 8848695 | 2013-03-14 14:09:05 -0500 | [diff] [blame] | 895 | if (!pages) { |
| 896 | pool = fsc->wb_pagevec_pool; |
Alex Elder | 8848695 | 2013-03-14 14:09:05 -0500 | [diff] [blame] | 897 | pages = mempool_alloc(pool, GFP_NOFS); |
Alex Elder | e5975c7 | 2013-03-14 14:09:05 -0500 | [diff] [blame] | 898 | BUG_ON(!pages); |
Alex Elder | 8848695 | 2013-03-14 14:09:05 -0500 | [diff] [blame] | 899 | } |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 900 | } |
| 901 | |
| 902 | /* note position of first page in pvec */ |
| 903 | if (first < 0) |
| 904 | first = i; |
| 905 | dout("%p will write page %p idx %lu\n", |
| 906 | inode, page, page->index); |
Yehuda Sadeh | 2baba25 | 2009-12-18 13:51:57 -0800 | [diff] [blame] | 907 | |
Sage Weil | 213c99e | 2010-08-03 10:25:11 -0700 | [diff] [blame] | 908 | writeback_stat = |
Yehuda Sadeh | 3d14c5d | 2010-04-06 15:14:15 -0700 | [diff] [blame] | 909 | atomic_long_inc_return(&fsc->writeback_count); |
Sage Weil | 213c99e | 2010-08-03 10:25:11 -0700 | [diff] [blame] | 910 | if (writeback_stat > CONGESTION_ON_THRESH( |
Yehuda Sadeh | 3d14c5d | 2010-04-06 15:14:15 -0700 | [diff] [blame] | 911 | fsc->mount_options->congestion_kb)) { |
| 912 | set_bdi_congested(&fsc->backing_dev_info, |
Sage Weil | 213c99e | 2010-08-03 10:25:11 -0700 | [diff] [blame] | 913 | BLK_RW_ASYNC); |
Yehuda Sadeh | 2baba25 | 2009-12-18 13:51:57 -0800 | [diff] [blame] | 914 | } |
| 915 | |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 916 | set_page_writeback(page); |
Alex Elder | e5975c7 | 2013-03-14 14:09:05 -0500 | [diff] [blame] | 917 | pages[locked_pages] = page; |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 918 | locked_pages++; |
| 919 | next = page->index + 1; |
| 920 | } |
| 921 | |
| 922 | /* did we get anything? */ |
| 923 | if (!locked_pages) |
| 924 | goto release_pvec_pages; |
| 925 | if (i) { |
| 926 | int j; |
| 927 | BUG_ON(!locked_pages || first < 0); |
| 928 | |
| 929 | if (pvec_pages && i == pvec_pages && |
| 930 | locked_pages < max_pages) { |
| 931 | dout("reached end pvec, trying for more\n"); |
| 932 | pagevec_reinit(&pvec); |
| 933 | goto get_more_pages; |
| 934 | } |
| 935 | |
| 936 | /* shift unused pages over in the pvec... we |
| 937 | * will need to release them below. */ |
| 938 | for (j = i; j < pvec_pages; j++) { |
| 939 | dout(" pvec leftover page %p\n", |
| 940 | pvec.pages[j]); |
| 941 | pvec.pages[j-i+first] = pvec.pages[j]; |
| 942 | } |
| 943 | pvec.nr -= i-first; |
| 944 | } |
| 945 | |
Alex Elder | e5975c7 | 2013-03-14 14:09:05 -0500 | [diff] [blame] | 946 | /* Format the osd request message and submit the write */ |
| 947 | |
| 948 | offset = page_offset(pages[0]); |
Yan, Zheng | 1ac0fc8 | 2013-04-12 21:45:42 +0800 | [diff] [blame] | 949 | len = min(snap_size - offset, |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 950 | (u64)locked_pages << PAGE_CACHE_SHIFT); |
| 951 | dout("writepages got %d pages at %llu~%llu\n", |
| 952 | locked_pages, offset, len); |
| 953 | |
Alex Elder | 406e2c9 | 2013-04-15 14:50:36 -0500 | [diff] [blame] | 954 | osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0, |
Alex Elder | a4ce40a | 2013-04-05 01:27:12 -0500 | [diff] [blame] | 955 | !!pool, false); |
Alex Elder | e5975c7 | 2013-03-14 14:09:05 -0500 | [diff] [blame] | 956 | |
| 957 | pages = NULL; /* request message now owns the pages array */ |
| 958 | pool = NULL; |
| 959 | |
| 960 | /* Update the write op length in case we changed it */ |
| 961 | |
Alex Elder | c99d2d4 | 2013-04-05 01:27:11 -0500 | [diff] [blame] | 962 | osd_req_op_extent_update(req, 0, len); |
Alex Elder | e5975c7 | 2013-03-14 14:09:05 -0500 | [diff] [blame] | 963 | |
| 964 | vino = ceph_vino(inode); |
Alex Elder | 7952873 | 2013-04-03 21:32:51 -0500 | [diff] [blame] | 965 | ceph_osdc_build_request(req, offset, snapc, vino.snap, |
| 966 | &inode->i_mtime); |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 967 | |
Sage Weil | 9d6fcb0 | 2011-05-12 15:48:16 -0700 | [diff] [blame] | 968 | rc = ceph_osdc_start_request(&fsc->client->osdc, req, true); |
| 969 | BUG_ON(rc); |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 970 | req = NULL; |
| 971 | |
| 972 | /* continue? */ |
| 973 | index = next; |
| 974 | wbc->nr_to_write -= locked_pages; |
| 975 | if (wbc->nr_to_write <= 0) |
| 976 | done = 1; |
| 977 | |
| 978 | release_pvec_pages: |
| 979 | dout("pagevec_release on %d pages (%p)\n", (int)pvec.nr, |
| 980 | pvec.nr ? pvec.pages[0] : NULL); |
| 981 | pagevec_release(&pvec); |
| 982 | |
| 983 | if (locked_pages && !done) |
| 984 | goto retry; |
| 985 | } |
| 986 | |
| 987 | if (should_loop && !done) { |
| 988 | /* more to do; loop back to beginning of file */ |
| 989 | dout("writepages looping back to beginning of file\n"); |
| 990 | should_loop = 0; |
| 991 | index = 0; |
| 992 | goto retry; |
| 993 | } |
| 994 | |
| 995 | if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) |
| 996 | mapping->writeback_index = index; |
| 997 | |
| 998 | out: |
| 999 | if (req) |
| 1000 | ceph_osdc_put_request(req); |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1001 | ceph_put_snap_context(snapc); |
| 1002 | dout("writepages done, rc = %d\n", rc); |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1003 | return rc; |
| 1004 | } |
| 1005 | |
| 1006 | |
| 1007 | |
| 1008 | /* |
| 1009 | * See if a given @snapc is either writeable, or already written. |
| 1010 | */ |
| 1011 | static int context_is_writeable_or_written(struct inode *inode, |
| 1012 | struct ceph_snap_context *snapc) |
| 1013 | { |
| 1014 | struct ceph_snap_context *oldest = get_oldest_context(inode, NULL); |
Sage Weil | 6298a33 | 2010-03-31 22:01:38 -0700 | [diff] [blame] | 1015 | int ret = !oldest || snapc->seq <= oldest->seq; |
| 1016 | |
| 1017 | ceph_put_snap_context(oldest); |
| 1018 | return ret; |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1019 | } |
| 1020 | |
| 1021 | /* |
| 1022 | * We are only allowed to write into/dirty the page if the page is |
| 1023 | * clean, or already dirty within the same snap context. |
Sage Weil | 8f883c2 | 2010-03-19 13:27:53 -0700 | [diff] [blame] | 1024 | * |
| 1025 | * called with page locked. |
| 1026 | * return success with page locked, |
| 1027 | * or any failure (incl -EAGAIN) with page unlocked. |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1028 | */ |
Yehuda Sadeh | 4af6b22 | 2010-02-09 11:02:51 -0800 | [diff] [blame] | 1029 | static int ceph_update_writeable_page(struct file *file, |
| 1030 | loff_t pos, unsigned len, |
| 1031 | struct page *page) |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1032 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 1033 | struct inode *inode = file_inode(file); |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1034 | struct ceph_inode_info *ci = ceph_inode(inode); |
Yehuda Sadeh | 3d14c5d | 2010-04-06 15:14:15 -0700 | [diff] [blame] | 1035 | struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc; |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1036 | loff_t page_off = pos & PAGE_CACHE_MASK; |
| 1037 | int pos_in_page = pos & ~PAGE_CACHE_MASK; |
| 1038 | int end_in_page = pos_in_page + len; |
| 1039 | loff_t i_size; |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1040 | int r; |
Sage Weil | 80e755f | 2010-03-31 21:52:10 -0700 | [diff] [blame] | 1041 | struct ceph_snap_context *snapc, *oldest; |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1042 | |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1043 | retry_locked: |
| 1044 | /* writepages currently holds page lock, but if we change that later, */ |
| 1045 | wait_on_page_writeback(page); |
| 1046 | |
| 1047 | /* check snap context */ |
| 1048 | BUG_ON(!ci->i_snap_realm); |
| 1049 | down_read(&mdsc->snap_rwsem); |
| 1050 | BUG_ON(!ci->i_snap_realm->cached_context); |
Yan, Zheng | 61600ef | 2012-05-28 14:44:30 +0800 | [diff] [blame] | 1051 | snapc = page_snap_context(page); |
Sage Weil | 80e755f | 2010-03-31 21:52:10 -0700 | [diff] [blame] | 1052 | if (snapc && snapc != ci->i_head_snapc) { |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1053 | /* |
| 1054 | * this page is already dirty in another (older) snap |
| 1055 | * context! is it writeable now? |
| 1056 | */ |
Sage Weil | 80e755f | 2010-03-31 21:52:10 -0700 | [diff] [blame] | 1057 | oldest = get_oldest_context(inode, NULL); |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1058 | up_read(&mdsc->snap_rwsem); |
| 1059 | |
Sage Weil | 80e755f | 2010-03-31 21:52:10 -0700 | [diff] [blame] | 1060 | if (snapc->seq > oldest->seq) { |
Sage Weil | 6298a33 | 2010-03-31 22:01:38 -0700 | [diff] [blame] | 1061 | ceph_put_snap_context(oldest); |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1062 | dout(" page %p snapc %p not current or oldest\n", |
Sage Weil | 6298a33 | 2010-03-31 22:01:38 -0700 | [diff] [blame] | 1063 | page, snapc); |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1064 | /* |
| 1065 | * queue for writeback, and wait for snapc to |
| 1066 | * be writeable or written |
| 1067 | */ |
Sage Weil | 6298a33 | 2010-03-31 22:01:38 -0700 | [diff] [blame] | 1068 | snapc = ceph_get_snap_context(snapc); |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1069 | unlock_page(page); |
Sage Weil | 3c6f6b7 | 2010-02-09 15:24:44 -0800 | [diff] [blame] | 1070 | ceph_queue_writeback(inode); |
Sage Weil | 8f883c2 | 2010-03-19 13:27:53 -0700 | [diff] [blame] | 1071 | r = wait_event_interruptible(ci->i_cap_wq, |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1072 | context_is_writeable_or_written(inode, snapc)); |
| 1073 | ceph_put_snap_context(snapc); |
Sage Weil | 8f883c2 | 2010-03-19 13:27:53 -0700 | [diff] [blame] | 1074 | if (r == -ERESTARTSYS) |
| 1075 | return r; |
Yehuda Sadeh | 4af6b22 | 2010-02-09 11:02:51 -0800 | [diff] [blame] | 1076 | return -EAGAIN; |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1077 | } |
Sage Weil | 6298a33 | 2010-03-31 22:01:38 -0700 | [diff] [blame] | 1078 | ceph_put_snap_context(oldest); |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1079 | |
| 1080 | /* yay, writeable, do it now (without dropping page lock) */ |
| 1081 | dout(" page %p snapc %p not current, but oldest\n", |
| 1082 | page, snapc); |
| 1083 | if (!clear_page_dirty_for_io(page)) |
| 1084 | goto retry_locked; |
| 1085 | r = writepage_nounlock(page, NULL); |
| 1086 | if (r < 0) |
| 1087 | goto fail_nosnap; |
| 1088 | goto retry_locked; |
| 1089 | } |
| 1090 | |
| 1091 | if (PageUptodate(page)) { |
| 1092 | dout(" page %p already uptodate\n", page); |
| 1093 | return 0; |
| 1094 | } |
| 1095 | |
| 1096 | /* full page? */ |
| 1097 | if (pos_in_page == 0 && len == PAGE_CACHE_SIZE) |
| 1098 | return 0; |
| 1099 | |
| 1100 | /* past end of file? */ |
| 1101 | i_size = inode->i_size; /* caller holds i_mutex */ |
| 1102 | |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1103 | if (page_off >= i_size || |
| 1104 | (pos_in_page == 0 && (pos+len) >= i_size && |
| 1105 | end_in_page - pos_in_page != PAGE_CACHE_SIZE)) { |
| 1106 | dout(" zeroing %p 0 - %d and %d - %d\n", |
| 1107 | page, pos_in_page, end_in_page, (int)PAGE_CACHE_SIZE); |
| 1108 | zero_user_segments(page, |
| 1109 | 0, pos_in_page, |
| 1110 | end_in_page, PAGE_CACHE_SIZE); |
| 1111 | return 0; |
| 1112 | } |
| 1113 | |
| 1114 | /* we need to read it. */ |
| 1115 | up_read(&mdsc->snap_rwsem); |
| 1116 | r = readpage_nounlock(file, page); |
| 1117 | if (r < 0) |
| 1118 | goto fail_nosnap; |
| 1119 | goto retry_locked; |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1120 | fail_nosnap: |
| 1121 | unlock_page(page); |
| 1122 | return r; |
| 1123 | } |
| 1124 | |
| 1125 | /* |
Yehuda Sadeh | 4af6b22 | 2010-02-09 11:02:51 -0800 | [diff] [blame] | 1126 | * We are only allowed to write into/dirty the page if the page is |
| 1127 | * clean, or already dirty within the same snap context. |
| 1128 | */ |
| 1129 | static int ceph_write_begin(struct file *file, struct address_space *mapping, |
| 1130 | loff_t pos, unsigned len, unsigned flags, |
| 1131 | struct page **pagep, void **fsdata) |
| 1132 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 1133 | struct inode *inode = file_inode(file); |
Yehuda Sadeh | 4af6b22 | 2010-02-09 11:02:51 -0800 | [diff] [blame] | 1134 | struct page *page; |
| 1135 | pgoff_t index = pos >> PAGE_CACHE_SHIFT; |
Sage Weil | 7971bd9 | 2013-05-01 21:15:58 -0700 | [diff] [blame] | 1136 | int r; |
Yehuda Sadeh | 4af6b22 | 2010-02-09 11:02:51 -0800 | [diff] [blame] | 1137 | |
| 1138 | do { |
Sage Weil | 8f883c2 | 2010-03-19 13:27:53 -0700 | [diff] [blame] | 1139 | /* get a page */ |
Yehuda Sadeh | 4af6b22 | 2010-02-09 11:02:51 -0800 | [diff] [blame] | 1140 | page = grab_cache_page_write_begin(mapping, index, 0); |
Sage Weil | 7971bd9 | 2013-05-01 21:15:58 -0700 | [diff] [blame] | 1141 | if (!page) |
| 1142 | return -ENOMEM; |
| 1143 | *pagep = page; |
Yehuda Sadeh | 4af6b22 | 2010-02-09 11:02:51 -0800 | [diff] [blame] | 1144 | |
| 1145 | dout("write_begin file %p inode %p page %p %d~%d\n", file, |
Sage Weil | 213c99e | 2010-08-03 10:25:11 -0700 | [diff] [blame] | 1146 | inode, page, (int)pos, (int)len); |
Yehuda Sadeh | 4af6b22 | 2010-02-09 11:02:51 -0800 | [diff] [blame] | 1147 | |
| 1148 | r = ceph_update_writeable_page(file, pos, len, page); |
| 1149 | } while (r == -EAGAIN); |
| 1150 | |
| 1151 | return r; |
| 1152 | } |
| 1153 | |
| 1154 | /* |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1155 | * we don't do anything in here that simple_write_end doesn't do |
| 1156 | * except adjust dirty page accounting and drop read lock on |
| 1157 | * mdsc->snap_rwsem. |
| 1158 | */ |
| 1159 | static int ceph_write_end(struct file *file, struct address_space *mapping, |
| 1160 | loff_t pos, unsigned len, unsigned copied, |
| 1161 | struct page *page, void *fsdata) |
| 1162 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 1163 | struct inode *inode = file_inode(file); |
Yehuda Sadeh | 3d14c5d | 2010-04-06 15:14:15 -0700 | [diff] [blame] | 1164 | struct ceph_fs_client *fsc = ceph_inode_to_client(inode); |
| 1165 | struct ceph_mds_client *mdsc = fsc->mdsc; |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1166 | unsigned from = pos & (PAGE_CACHE_SIZE - 1); |
| 1167 | int check_cap = 0; |
| 1168 | |
| 1169 | dout("write_end file %p inode %p page %p %d~%d (%d)\n", file, |
| 1170 | inode, page, (int)pos, (int)copied, (int)len); |
| 1171 | |
| 1172 | /* zero the stale part of the page if we did a short copy */ |
| 1173 | if (copied < len) |
| 1174 | zero_user_segment(page, from+copied, len); |
| 1175 | |
| 1176 | /* did file size increase? */ |
| 1177 | /* (no need for i_size_read(); we caller holds i_mutex */ |
| 1178 | if (pos+copied > inode->i_size) |
| 1179 | check_cap = ceph_inode_set_size(inode, pos+copied); |
| 1180 | |
| 1181 | if (!PageUptodate(page)) |
| 1182 | SetPageUptodate(page); |
| 1183 | |
| 1184 | set_page_dirty(page); |
| 1185 | |
| 1186 | unlock_page(page); |
| 1187 | up_read(&mdsc->snap_rwsem); |
| 1188 | page_cache_release(page); |
| 1189 | |
| 1190 | if (check_cap) |
| 1191 | ceph_check_caps(ceph_inode(inode), CHECK_CAPS_AUTHONLY, NULL); |
| 1192 | |
| 1193 | return copied; |
| 1194 | } |
| 1195 | |
| 1196 | /* |
| 1197 | * we set .direct_IO to indicate direct io is supported, but since we |
| 1198 | * intercept O_DIRECT reads and writes early, this function should |
| 1199 | * never get called. |
| 1200 | */ |
| 1201 | static ssize_t ceph_direct_io(int rw, struct kiocb *iocb, |
Al Viro | d8d3d94 | 2014-03-04 21:27:34 -0500 | [diff] [blame] | 1202 | struct iov_iter *iter, |
| 1203 | loff_t pos) |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1204 | { |
| 1205 | WARN_ON(1); |
| 1206 | return -EINVAL; |
| 1207 | } |
| 1208 | |
| 1209 | const struct address_space_operations ceph_aops = { |
| 1210 | .readpage = ceph_readpage, |
| 1211 | .readpages = ceph_readpages, |
| 1212 | .writepage = ceph_writepage, |
| 1213 | .writepages = ceph_writepages_start, |
| 1214 | .write_begin = ceph_write_begin, |
| 1215 | .write_end = ceph_write_end, |
| 1216 | .set_page_dirty = ceph_set_page_dirty, |
| 1217 | .invalidatepage = ceph_invalidatepage, |
| 1218 | .releasepage = ceph_releasepage, |
| 1219 | .direct_IO = ceph_direct_io, |
| 1220 | }; |
| 1221 | |
| 1222 | |
| 1223 | /* |
| 1224 | * vm ops |
| 1225 | */ |
Yan, Zheng | 61f6881 | 2013-11-28 14:28:14 +0800 | [diff] [blame] | 1226 | static int ceph_filemap_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
| 1227 | { |
| 1228 | struct inode *inode = file_inode(vma->vm_file); |
| 1229 | struct ceph_inode_info *ci = ceph_inode(inode); |
| 1230 | struct ceph_file_info *fi = vma->vm_file->private_data; |
Yan, Zheng | 3738daa | 2014-11-14 22:10:07 +0800 | [diff] [blame] | 1231 | struct page *pinned_page = NULL; |
Yan, Zheng | 61f6881 | 2013-11-28 14:28:14 +0800 | [diff] [blame] | 1232 | loff_t off = vmf->pgoff << PAGE_CACHE_SHIFT; |
| 1233 | int want, got, ret; |
| 1234 | |
| 1235 | dout("filemap_fault %p %llx.%llx %llu~%zd trying to get caps\n", |
Ilya Dryomov | 37b52fe | 2014-01-28 18:29:29 +0200 | [diff] [blame] | 1236 | inode, ceph_vinop(inode), off, (size_t)PAGE_CACHE_SIZE); |
Yan, Zheng | 61f6881 | 2013-11-28 14:28:14 +0800 | [diff] [blame] | 1237 | if (fi->fmode & CEPH_FILE_MODE_LAZY) |
| 1238 | want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO; |
| 1239 | else |
| 1240 | want = CEPH_CAP_FILE_CACHE; |
| 1241 | while (1) { |
| 1242 | got = 0; |
Yan, Zheng | 8370124 | 2014-11-14 22:36:18 +0800 | [diff] [blame] | 1243 | ret = ceph_get_caps(ci, CEPH_CAP_FILE_RD, want, |
| 1244 | -1, &got, &pinned_page); |
Yan, Zheng | 61f6881 | 2013-11-28 14:28:14 +0800 | [diff] [blame] | 1245 | if (ret == 0) |
| 1246 | break; |
| 1247 | if (ret != -ERESTARTSYS) { |
| 1248 | WARN_ON(1); |
| 1249 | return VM_FAULT_SIGBUS; |
| 1250 | } |
| 1251 | } |
| 1252 | dout("filemap_fault %p %llu~%zd got cap refs on %s\n", |
Ilya Dryomov | 37b52fe | 2014-01-28 18:29:29 +0200 | [diff] [blame] | 1253 | inode, off, (size_t)PAGE_CACHE_SIZE, ceph_cap_string(got)); |
Yan, Zheng | 61f6881 | 2013-11-28 14:28:14 +0800 | [diff] [blame] | 1254 | |
Yan, Zheng | 8370124 | 2014-11-14 22:36:18 +0800 | [diff] [blame] | 1255 | if ((got & (CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO)) || |
| 1256 | ci->i_inline_version == CEPH_INLINE_NONE) |
| 1257 | ret = filemap_fault(vma, vmf); |
| 1258 | else |
| 1259 | ret = -EAGAIN; |
Yan, Zheng | 61f6881 | 2013-11-28 14:28:14 +0800 | [diff] [blame] | 1260 | |
| 1261 | dout("filemap_fault %p %llu~%zd dropping cap refs on %s ret %d\n", |
Ilya Dryomov | 37b52fe | 2014-01-28 18:29:29 +0200 | [diff] [blame] | 1262 | inode, off, (size_t)PAGE_CACHE_SIZE, ceph_cap_string(got), ret); |
Yan, Zheng | 3738daa | 2014-11-14 22:10:07 +0800 | [diff] [blame] | 1263 | if (pinned_page) |
| 1264 | page_cache_release(pinned_page); |
Yan, Zheng | 61f6881 | 2013-11-28 14:28:14 +0800 | [diff] [blame] | 1265 | ceph_put_cap_refs(ci, got); |
| 1266 | |
Yan, Zheng | 8370124 | 2014-11-14 22:36:18 +0800 | [diff] [blame] | 1267 | if (ret != -EAGAIN) |
| 1268 | return ret; |
| 1269 | |
| 1270 | /* read inline data */ |
| 1271 | if (off >= PAGE_CACHE_SIZE) { |
| 1272 | /* does not support inline data > PAGE_SIZE */ |
| 1273 | ret = VM_FAULT_SIGBUS; |
| 1274 | } else { |
| 1275 | int ret1; |
| 1276 | struct address_space *mapping = inode->i_mapping; |
| 1277 | struct page *page = find_or_create_page(mapping, 0, |
| 1278 | mapping_gfp_mask(mapping) & |
| 1279 | ~__GFP_FS); |
| 1280 | if (!page) { |
| 1281 | ret = VM_FAULT_OOM; |
| 1282 | goto out; |
| 1283 | } |
| 1284 | ret1 = __ceph_do_getattr(inode, page, |
| 1285 | CEPH_STAT_CAP_INLINE_DATA, true); |
| 1286 | if (ret1 < 0 || off >= i_size_read(inode)) { |
| 1287 | unlock_page(page); |
| 1288 | page_cache_release(page); |
| 1289 | ret = VM_FAULT_SIGBUS; |
| 1290 | goto out; |
| 1291 | } |
| 1292 | if (ret1 < PAGE_CACHE_SIZE) |
| 1293 | zero_user_segment(page, ret1, PAGE_CACHE_SIZE); |
| 1294 | else |
| 1295 | flush_dcache_page(page); |
| 1296 | SetPageUptodate(page); |
| 1297 | vmf->page = page; |
| 1298 | ret = VM_FAULT_MAJOR | VM_FAULT_LOCKED; |
| 1299 | } |
| 1300 | out: |
| 1301 | dout("filemap_fault %p %llu~%zd read inline data ret %d\n", |
| 1302 | inode, off, (size_t)PAGE_CACHE_SIZE, ret); |
Yan, Zheng | 61f6881 | 2013-11-28 14:28:14 +0800 | [diff] [blame] | 1303 | return ret; |
| 1304 | } |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1305 | |
| 1306 | /* |
| 1307 | * Reuse write_begin here for simplicity. |
| 1308 | */ |
| 1309 | static int ceph_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) |
| 1310 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 1311 | struct inode *inode = file_inode(vma->vm_file); |
Yan, Zheng | 61f6881 | 2013-11-28 14:28:14 +0800 | [diff] [blame] | 1312 | struct ceph_inode_info *ci = ceph_inode(inode); |
| 1313 | struct ceph_file_info *fi = vma->vm_file->private_data; |
Yehuda Sadeh | 3d14c5d | 2010-04-06 15:14:15 -0700 | [diff] [blame] | 1314 | struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc; |
Yan, Zheng | 61f6881 | 2013-11-28 14:28:14 +0800 | [diff] [blame] | 1315 | struct page *page = vmf->page; |
Alex Elder | 6285bc2 | 2012-10-02 10:25:51 -0500 | [diff] [blame] | 1316 | loff_t off = page_offset(page); |
Yan, Zheng | 61f6881 | 2013-11-28 14:28:14 +0800 | [diff] [blame] | 1317 | loff_t size = i_size_read(inode); |
| 1318 | size_t len; |
| 1319 | int want, got, ret; |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1320 | |
Yan, Zheng | 28127bd | 2014-11-14 22:38:29 +0800 | [diff] [blame] | 1321 | if (ci->i_inline_version != CEPH_INLINE_NONE) { |
| 1322 | struct page *locked_page = NULL; |
| 1323 | if (off == 0) { |
| 1324 | lock_page(page); |
| 1325 | locked_page = page; |
| 1326 | } |
| 1327 | ret = ceph_uninline_data(vma->vm_file, locked_page); |
| 1328 | if (locked_page) |
| 1329 | unlock_page(locked_page); |
| 1330 | if (ret < 0) |
| 1331 | return VM_FAULT_SIGBUS; |
| 1332 | } |
| 1333 | |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1334 | if (off + PAGE_CACHE_SIZE <= size) |
| 1335 | len = PAGE_CACHE_SIZE; |
| 1336 | else |
| 1337 | len = size & ~PAGE_CACHE_MASK; |
| 1338 | |
Yan, Zheng | 61f6881 | 2013-11-28 14:28:14 +0800 | [diff] [blame] | 1339 | dout("page_mkwrite %p %llx.%llx %llu~%zd getting caps i_size %llu\n", |
| 1340 | inode, ceph_vinop(inode), off, len, size); |
| 1341 | if (fi->fmode & CEPH_FILE_MODE_LAZY) |
| 1342 | want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO; |
| 1343 | else |
| 1344 | want = CEPH_CAP_FILE_BUFFER; |
| 1345 | while (1) { |
| 1346 | got = 0; |
Yan, Zheng | 3738daa | 2014-11-14 22:10:07 +0800 | [diff] [blame] | 1347 | ret = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, off + len, |
| 1348 | &got, NULL); |
Yan, Zheng | 61f6881 | 2013-11-28 14:28:14 +0800 | [diff] [blame] | 1349 | if (ret == 0) |
| 1350 | break; |
| 1351 | if (ret != -ERESTARTSYS) { |
| 1352 | WARN_ON(1); |
| 1353 | return VM_FAULT_SIGBUS; |
| 1354 | } |
| 1355 | } |
| 1356 | dout("page_mkwrite %p %llu~%zd got cap refs on %s\n", |
| 1357 | inode, off, len, ceph_cap_string(got)); |
| 1358 | |
| 1359 | /* Update time before taking page lock */ |
| 1360 | file_update_time(vma->vm_file); |
Yehuda Sadeh | 4af6b22 | 2010-02-09 11:02:51 -0800 | [diff] [blame] | 1361 | |
| 1362 | lock_page(page); |
| 1363 | |
| 1364 | ret = VM_FAULT_NOPAGE; |
| 1365 | if ((off > size) || |
| 1366 | (page->mapping != inode->i_mapping)) |
| 1367 | goto out; |
| 1368 | |
| 1369 | ret = ceph_update_writeable_page(vma->vm_file, off, len, page); |
| 1370 | if (ret == 0) { |
| 1371 | /* success. we'll keep the page locked. */ |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1372 | set_page_dirty(page); |
| 1373 | up_read(&mdsc->snap_rwsem); |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1374 | ret = VM_FAULT_LOCKED; |
| 1375 | } else { |
Yehuda Sadeh | 4af6b22 | 2010-02-09 11:02:51 -0800 | [diff] [blame] | 1376 | if (ret == -ENOMEM) |
| 1377 | ret = VM_FAULT_OOM; |
| 1378 | else |
| 1379 | ret = VM_FAULT_SIGBUS; |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1380 | } |
Yehuda Sadeh | 4af6b22 | 2010-02-09 11:02:51 -0800 | [diff] [blame] | 1381 | out: |
Yan, Zheng | 28127bd | 2014-11-14 22:38:29 +0800 | [diff] [blame] | 1382 | if (ret != VM_FAULT_LOCKED) |
Yehuda Sadeh | 4af6b22 | 2010-02-09 11:02:51 -0800 | [diff] [blame] | 1383 | unlock_page(page); |
Yan, Zheng | 28127bd | 2014-11-14 22:38:29 +0800 | [diff] [blame] | 1384 | if (ret == VM_FAULT_LOCKED || |
| 1385 | ci->i_inline_version != CEPH_INLINE_NONE) { |
Yan, Zheng | 61f6881 | 2013-11-28 14:28:14 +0800 | [diff] [blame] | 1386 | int dirty; |
| 1387 | spin_lock(&ci->i_ceph_lock); |
Yan, Zheng | 28127bd | 2014-11-14 22:38:29 +0800 | [diff] [blame] | 1388 | ci->i_inline_version = CEPH_INLINE_NONE; |
Yan, Zheng | 61f6881 | 2013-11-28 14:28:14 +0800 | [diff] [blame] | 1389 | dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR); |
| 1390 | spin_unlock(&ci->i_ceph_lock); |
| 1391 | if (dirty) |
| 1392 | __mark_inode_dirty(inode, dirty); |
| 1393 | } |
| 1394 | |
| 1395 | dout("page_mkwrite %p %llu~%zd dropping cap refs on %s ret %d\n", |
| 1396 | inode, off, len, ceph_cap_string(got), ret); |
| 1397 | ceph_put_cap_refs(ci, got); |
| 1398 | |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1399 | return ret; |
| 1400 | } |
| 1401 | |
Yan, Zheng | 31c542a | 2014-11-14 21:41:55 +0800 | [diff] [blame] | 1402 | void ceph_fill_inline_data(struct inode *inode, struct page *locked_page, |
| 1403 | char *data, size_t len) |
| 1404 | { |
| 1405 | struct address_space *mapping = inode->i_mapping; |
| 1406 | struct page *page; |
| 1407 | |
| 1408 | if (locked_page) { |
| 1409 | page = locked_page; |
| 1410 | } else { |
| 1411 | if (i_size_read(inode) == 0) |
| 1412 | return; |
| 1413 | page = find_or_create_page(mapping, 0, |
| 1414 | mapping_gfp_mask(mapping) & ~__GFP_FS); |
| 1415 | if (!page) |
| 1416 | return; |
| 1417 | if (PageUptodate(page)) { |
| 1418 | unlock_page(page); |
| 1419 | page_cache_release(page); |
| 1420 | return; |
| 1421 | } |
| 1422 | } |
| 1423 | |
Ilya Dryomov | 0668ff5 | 2014-12-19 13:10:10 +0300 | [diff] [blame] | 1424 | dout("fill_inline_data %p %llx.%llx len %zu locked_page %p\n", |
Yan, Zheng | 31c542a | 2014-11-14 21:41:55 +0800 | [diff] [blame] | 1425 | inode, ceph_vinop(inode), len, locked_page); |
| 1426 | |
| 1427 | if (len > 0) { |
| 1428 | void *kaddr = kmap_atomic(page); |
| 1429 | memcpy(kaddr, data, len); |
| 1430 | kunmap_atomic(kaddr); |
| 1431 | } |
| 1432 | |
| 1433 | if (page != locked_page) { |
| 1434 | if (len < PAGE_CACHE_SIZE) |
| 1435 | zero_user_segment(page, len, PAGE_CACHE_SIZE); |
| 1436 | else |
| 1437 | flush_dcache_page(page); |
| 1438 | |
| 1439 | SetPageUptodate(page); |
| 1440 | unlock_page(page); |
| 1441 | page_cache_release(page); |
| 1442 | } |
| 1443 | } |
| 1444 | |
Yan, Zheng | 28127bd | 2014-11-14 22:38:29 +0800 | [diff] [blame] | 1445 | int ceph_uninline_data(struct file *filp, struct page *locked_page) |
| 1446 | { |
| 1447 | struct inode *inode = file_inode(filp); |
| 1448 | struct ceph_inode_info *ci = ceph_inode(inode); |
| 1449 | struct ceph_fs_client *fsc = ceph_inode_to_client(inode); |
| 1450 | struct ceph_osd_request *req; |
| 1451 | struct page *page = NULL; |
| 1452 | u64 len, inline_version; |
| 1453 | int err = 0; |
| 1454 | bool from_pagecache = false; |
| 1455 | |
| 1456 | spin_lock(&ci->i_ceph_lock); |
| 1457 | inline_version = ci->i_inline_version; |
| 1458 | spin_unlock(&ci->i_ceph_lock); |
| 1459 | |
| 1460 | dout("uninline_data %p %llx.%llx inline_version %llu\n", |
| 1461 | inode, ceph_vinop(inode), inline_version); |
| 1462 | |
| 1463 | if (inline_version == 1 || /* initial version, no data */ |
| 1464 | inline_version == CEPH_INLINE_NONE) |
| 1465 | goto out; |
| 1466 | |
| 1467 | if (locked_page) { |
| 1468 | page = locked_page; |
| 1469 | WARN_ON(!PageUptodate(page)); |
| 1470 | } else if (ceph_caps_issued(ci) & |
| 1471 | (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) { |
| 1472 | page = find_get_page(inode->i_mapping, 0); |
| 1473 | if (page) { |
| 1474 | if (PageUptodate(page)) { |
| 1475 | from_pagecache = true; |
| 1476 | lock_page(page); |
| 1477 | } else { |
| 1478 | page_cache_release(page); |
| 1479 | page = NULL; |
| 1480 | } |
| 1481 | } |
| 1482 | } |
| 1483 | |
| 1484 | if (page) { |
| 1485 | len = i_size_read(inode); |
| 1486 | if (len > PAGE_CACHE_SIZE) |
| 1487 | len = PAGE_CACHE_SIZE; |
| 1488 | } else { |
| 1489 | page = __page_cache_alloc(GFP_NOFS); |
| 1490 | if (!page) { |
| 1491 | err = -ENOMEM; |
| 1492 | goto out; |
| 1493 | } |
| 1494 | err = __ceph_do_getattr(inode, page, |
| 1495 | CEPH_STAT_CAP_INLINE_DATA, true); |
| 1496 | if (err < 0) { |
| 1497 | /* no inline data */ |
| 1498 | if (err == -ENODATA) |
| 1499 | err = 0; |
| 1500 | goto out; |
| 1501 | } |
| 1502 | len = err; |
| 1503 | } |
| 1504 | |
| 1505 | req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, |
| 1506 | ceph_vino(inode), 0, &len, 0, 1, |
| 1507 | CEPH_OSD_OP_CREATE, |
| 1508 | CEPH_OSD_FLAG_ONDISK | CEPH_OSD_FLAG_WRITE, |
| 1509 | ci->i_snap_realm->cached_context, |
| 1510 | 0, 0, false); |
| 1511 | if (IS_ERR(req)) { |
| 1512 | err = PTR_ERR(req); |
| 1513 | goto out; |
| 1514 | } |
| 1515 | |
| 1516 | ceph_osdc_build_request(req, 0, NULL, CEPH_NOSNAP, &inode->i_mtime); |
| 1517 | err = ceph_osdc_start_request(&fsc->client->osdc, req, false); |
| 1518 | if (!err) |
| 1519 | err = ceph_osdc_wait_request(&fsc->client->osdc, req); |
| 1520 | ceph_osdc_put_request(req); |
| 1521 | if (err < 0) |
| 1522 | goto out; |
| 1523 | |
| 1524 | req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, |
| 1525 | ceph_vino(inode), 0, &len, 1, 3, |
| 1526 | CEPH_OSD_OP_WRITE, |
| 1527 | CEPH_OSD_FLAG_ONDISK | CEPH_OSD_FLAG_WRITE, |
| 1528 | ci->i_snap_realm->cached_context, |
| 1529 | ci->i_truncate_seq, ci->i_truncate_size, |
| 1530 | false); |
| 1531 | if (IS_ERR(req)) { |
| 1532 | err = PTR_ERR(req); |
| 1533 | goto out; |
| 1534 | } |
| 1535 | |
| 1536 | osd_req_op_extent_osd_data_pages(req, 1, &page, len, 0, false, false); |
| 1537 | |
| 1538 | err = osd_req_op_xattr_init(req, 0, CEPH_OSD_OP_CMPXATTR, |
| 1539 | "inline_version", &inline_version, |
| 1540 | sizeof(inline_version), |
| 1541 | CEPH_OSD_CMPXATTR_OP_GT, |
| 1542 | CEPH_OSD_CMPXATTR_MODE_U64); |
| 1543 | if (err) |
| 1544 | goto out_put; |
| 1545 | |
| 1546 | err = osd_req_op_xattr_init(req, 2, CEPH_OSD_OP_SETXATTR, |
| 1547 | "inline_version", &inline_version, |
| 1548 | sizeof(inline_version), 0, 0); |
| 1549 | if (err) |
| 1550 | goto out_put; |
| 1551 | |
| 1552 | ceph_osdc_build_request(req, 0, NULL, CEPH_NOSNAP, &inode->i_mtime); |
| 1553 | err = ceph_osdc_start_request(&fsc->client->osdc, req, false); |
| 1554 | if (!err) |
| 1555 | err = ceph_osdc_wait_request(&fsc->client->osdc, req); |
| 1556 | out_put: |
| 1557 | ceph_osdc_put_request(req); |
| 1558 | if (err == -ECANCELED) |
| 1559 | err = 0; |
| 1560 | out: |
| 1561 | if (page && page != locked_page) { |
| 1562 | if (from_pagecache) { |
| 1563 | unlock_page(page); |
| 1564 | page_cache_release(page); |
| 1565 | } else |
| 1566 | __free_pages(page, 0); |
| 1567 | } |
| 1568 | |
| 1569 | dout("uninline_data %p %llx.%llx inline_version %llu = %d\n", |
| 1570 | inode, ceph_vinop(inode), inline_version, err); |
| 1571 | return err; |
| 1572 | } |
| 1573 | |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1574 | static struct vm_operations_struct ceph_vmops = { |
Yan, Zheng | 61f6881 | 2013-11-28 14:28:14 +0800 | [diff] [blame] | 1575 | .fault = ceph_filemap_fault, |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1576 | .page_mkwrite = ceph_page_mkwrite, |
| 1577 | }; |
| 1578 | |
| 1579 | int ceph_mmap(struct file *file, struct vm_area_struct *vma) |
| 1580 | { |
| 1581 | struct address_space *mapping = file->f_mapping; |
| 1582 | |
| 1583 | if (!mapping->a_ops->readpage) |
| 1584 | return -ENOEXEC; |
| 1585 | file_accessed(file); |
| 1586 | vma->vm_ops = &ceph_vmops; |
Sage Weil | 1d3576f | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1587 | return 0; |
| 1588 | } |