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-rw-r--r--kernel/fs/exofs/inode.c1524
1 files changed, 1524 insertions, 0 deletions
diff --git a/kernel/fs/exofs/inode.c b/kernel/fs/exofs/inode.c
new file mode 100644
index 000000000..786e4cc8c
--- /dev/null
+++ b/kernel/fs/exofs/inode.c
@@ -0,0 +1,1524 @@
+/*
+ * Copyright (C) 2005, 2006
+ * Avishay Traeger (avishay@gmail.com)
+ * Copyright (C) 2008, 2009
+ * Boaz Harrosh <ooo@electrozaur.com>
+ *
+ * Copyrights for code taken from ext2:
+ * Copyright (C) 1992, 1993, 1994, 1995
+ * Remy Card (card@masi.ibp.fr)
+ * Laboratoire MASI - Institut Blaise Pascal
+ * Universite Pierre et Marie Curie (Paris VI)
+ * from
+ * linux/fs/minix/inode.c
+ * Copyright (C) 1991, 1992 Linus Torvalds
+ *
+ * This file is part of exofs.
+ *
+ * exofs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation. Since it is based on ext2, and the only
+ * valid version of GPL for the Linux kernel is version 2, the only valid
+ * version of GPL for exofs is version 2.
+ *
+ * exofs is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with exofs; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <linux/slab.h>
+
+#include "exofs.h"
+
+#define EXOFS_DBGMSG2(M...) do {} while (0)
+
+unsigned exofs_max_io_pages(struct ore_layout *layout,
+ unsigned expected_pages)
+{
+ unsigned pages = min_t(unsigned, expected_pages,
+ layout->max_io_length / PAGE_SIZE);
+
+ return pages;
+}
+
+struct page_collect {
+ struct exofs_sb_info *sbi;
+ struct inode *inode;
+ unsigned expected_pages;
+ struct ore_io_state *ios;
+
+ struct page **pages;
+ unsigned alloc_pages;
+ unsigned nr_pages;
+ unsigned long length;
+ loff_t pg_first; /* keep 64bit also in 32-arches */
+ bool read_4_write; /* This means two things: that the read is sync
+ * And the pages should not be unlocked.
+ */
+ struct page *that_locked_page;
+};
+
+static void _pcol_init(struct page_collect *pcol, unsigned expected_pages,
+ struct inode *inode)
+{
+ struct exofs_sb_info *sbi = inode->i_sb->s_fs_info;
+
+ pcol->sbi = sbi;
+ pcol->inode = inode;
+ pcol->expected_pages = expected_pages;
+
+ pcol->ios = NULL;
+ pcol->pages = NULL;
+ pcol->alloc_pages = 0;
+ pcol->nr_pages = 0;
+ pcol->length = 0;
+ pcol->pg_first = -1;
+ pcol->read_4_write = false;
+ pcol->that_locked_page = NULL;
+}
+
+static void _pcol_reset(struct page_collect *pcol)
+{
+ pcol->expected_pages -= min(pcol->nr_pages, pcol->expected_pages);
+
+ pcol->pages = NULL;
+ pcol->alloc_pages = 0;
+ pcol->nr_pages = 0;
+ pcol->length = 0;
+ pcol->pg_first = -1;
+ pcol->ios = NULL;
+ pcol->that_locked_page = NULL;
+
+ /* this is probably the end of the loop but in writes
+ * it might not end here. don't be left with nothing
+ */
+ if (!pcol->expected_pages)
+ pcol->expected_pages =
+ exofs_max_io_pages(&pcol->sbi->layout, ~0);
+}
+
+static int pcol_try_alloc(struct page_collect *pcol)
+{
+ unsigned pages;
+
+ /* TODO: easily support bio chaining */
+ pages = exofs_max_io_pages(&pcol->sbi->layout, pcol->expected_pages);
+
+ for (; pages; pages >>= 1) {
+ pcol->pages = kmalloc(pages * sizeof(struct page *),
+ GFP_KERNEL);
+ if (likely(pcol->pages)) {
+ pcol->alloc_pages = pages;
+ return 0;
+ }
+ }
+
+ EXOFS_ERR("Failed to kmalloc expected_pages=%u\n",
+ pcol->expected_pages);
+ return -ENOMEM;
+}
+
+static void pcol_free(struct page_collect *pcol)
+{
+ kfree(pcol->pages);
+ pcol->pages = NULL;
+
+ if (pcol->ios) {
+ ore_put_io_state(pcol->ios);
+ pcol->ios = NULL;
+ }
+}
+
+static int pcol_add_page(struct page_collect *pcol, struct page *page,
+ unsigned len)
+{
+ if (unlikely(pcol->nr_pages >= pcol->alloc_pages))
+ return -ENOMEM;
+
+ pcol->pages[pcol->nr_pages++] = page;
+ pcol->length += len;
+ return 0;
+}
+
+enum {PAGE_WAS_NOT_IN_IO = 17};
+static int update_read_page(struct page *page, int ret)
+{
+ switch (ret) {
+ case 0:
+ /* Everything is OK */
+ SetPageUptodate(page);
+ if (PageError(page))
+ ClearPageError(page);
+ break;
+ case -EFAULT:
+ /* In this case we were trying to read something that wasn't on
+ * disk yet - return a page full of zeroes. This should be OK,
+ * because the object should be empty (if there was a write
+ * before this read, the read would be waiting with the page
+ * locked */
+ clear_highpage(page);
+
+ SetPageUptodate(page);
+ if (PageError(page))
+ ClearPageError(page);
+ EXOFS_DBGMSG("recovered read error\n");
+ /* fall through */
+ case PAGE_WAS_NOT_IN_IO:
+ ret = 0; /* recovered error */
+ break;
+ default:
+ SetPageError(page);
+ }
+ return ret;
+}
+
+static void update_write_page(struct page *page, int ret)
+{
+ if (unlikely(ret == PAGE_WAS_NOT_IN_IO))
+ return; /* don't pass start don't collect $200 */
+
+ if (ret) {
+ mapping_set_error(page->mapping, ret);
+ SetPageError(page);
+ }
+ end_page_writeback(page);
+}
+
+/* Called at the end of reads, to optionally unlock pages and update their
+ * status.
+ */
+static int __readpages_done(struct page_collect *pcol)
+{
+ int i;
+ u64 good_bytes;
+ u64 length = 0;
+ int ret = ore_check_io(pcol->ios, NULL);
+
+ if (likely(!ret)) {
+ good_bytes = pcol->length;
+ ret = PAGE_WAS_NOT_IN_IO;
+ } else {
+ good_bytes = 0;
+ }
+
+ EXOFS_DBGMSG2("readpages_done(0x%lx) good_bytes=0x%llx"
+ " length=0x%lx nr_pages=%u\n",
+ pcol->inode->i_ino, _LLU(good_bytes), pcol->length,
+ pcol->nr_pages);
+
+ for (i = 0; i < pcol->nr_pages; i++) {
+ struct page *page = pcol->pages[i];
+ struct inode *inode = page->mapping->host;
+ int page_stat;
+
+ if (inode != pcol->inode)
+ continue; /* osd might add more pages at end */
+
+ if (likely(length < good_bytes))
+ page_stat = 0;
+ else
+ page_stat = ret;
+
+ EXOFS_DBGMSG2(" readpages_done(0x%lx, 0x%lx) %s\n",
+ inode->i_ino, page->index,
+ page_stat ? "bad_bytes" : "good_bytes");
+
+ ret = update_read_page(page, page_stat);
+ if (!pcol->read_4_write)
+ unlock_page(page);
+ length += PAGE_SIZE;
+ }
+
+ pcol_free(pcol);
+ EXOFS_DBGMSG2("readpages_done END\n");
+ return ret;
+}
+
+/* callback of async reads */
+static void readpages_done(struct ore_io_state *ios, void *p)
+{
+ struct page_collect *pcol = p;
+
+ __readpages_done(pcol);
+ atomic_dec(&pcol->sbi->s_curr_pending);
+ kfree(pcol);
+}
+
+static void _unlock_pcol_pages(struct page_collect *pcol, int ret, int rw)
+{
+ int i;
+
+ for (i = 0; i < pcol->nr_pages; i++) {
+ struct page *page = pcol->pages[i];
+
+ if (rw == READ)
+ update_read_page(page, ret);
+ else
+ update_write_page(page, ret);
+
+ unlock_page(page);
+ }
+}
+
+static int _maybe_not_all_in_one_io(struct ore_io_state *ios,
+ struct page_collect *pcol_src, struct page_collect *pcol)
+{
+ /* length was wrong or offset was not page aligned */
+ BUG_ON(pcol_src->nr_pages < ios->nr_pages);
+
+ if (pcol_src->nr_pages > ios->nr_pages) {
+ struct page **src_page;
+ unsigned pages_less = pcol_src->nr_pages - ios->nr_pages;
+ unsigned long len_less = pcol_src->length - ios->length;
+ unsigned i;
+ int ret;
+
+ /* This IO was trimmed */
+ pcol_src->nr_pages = ios->nr_pages;
+ pcol_src->length = ios->length;
+
+ /* Left over pages are passed to the next io */
+ pcol->expected_pages += pages_less;
+ pcol->nr_pages = pages_less;
+ pcol->length = len_less;
+ src_page = pcol_src->pages + pcol_src->nr_pages;
+ pcol->pg_first = (*src_page)->index;
+
+ ret = pcol_try_alloc(pcol);
+ if (unlikely(ret))
+ return ret;
+
+ for (i = 0; i < pages_less; ++i)
+ pcol->pages[i] = *src_page++;
+
+ EXOFS_DBGMSG("Length was adjusted nr_pages=0x%x "
+ "pages_less=0x%x expected_pages=0x%x "
+ "next_offset=0x%llx next_len=0x%lx\n",
+ pcol_src->nr_pages, pages_less, pcol->expected_pages,
+ pcol->pg_first * PAGE_SIZE, pcol->length);
+ }
+ return 0;
+}
+
+static int read_exec(struct page_collect *pcol)
+{
+ struct exofs_i_info *oi = exofs_i(pcol->inode);
+ struct ore_io_state *ios;
+ struct page_collect *pcol_copy = NULL;
+ int ret;
+
+ if (!pcol->pages)
+ return 0;
+
+ if (!pcol->ios) {
+ int ret = ore_get_rw_state(&pcol->sbi->layout, &oi->oc, true,
+ pcol->pg_first << PAGE_CACHE_SHIFT,
+ pcol->length, &pcol->ios);
+
+ if (ret)
+ return ret;
+ }
+
+ ios = pcol->ios;
+ ios->pages = pcol->pages;
+
+ if (pcol->read_4_write) {
+ ore_read(pcol->ios);
+ return __readpages_done(pcol);
+ }
+
+ pcol_copy = kmalloc(sizeof(*pcol_copy), GFP_KERNEL);
+ if (!pcol_copy) {
+ ret = -ENOMEM;
+ goto err;
+ }
+
+ *pcol_copy = *pcol;
+ ios->done = readpages_done;
+ ios->private = pcol_copy;
+
+ /* pages ownership was passed to pcol_copy */
+ _pcol_reset(pcol);
+
+ ret = _maybe_not_all_in_one_io(ios, pcol_copy, pcol);
+ if (unlikely(ret))
+ goto err;
+
+ EXOFS_DBGMSG2("read_exec(0x%lx) offset=0x%llx length=0x%llx\n",
+ pcol->inode->i_ino, _LLU(ios->offset), _LLU(ios->length));
+
+ ret = ore_read(ios);
+ if (unlikely(ret))
+ goto err;
+
+ atomic_inc(&pcol->sbi->s_curr_pending);
+
+ return 0;
+
+err:
+ if (!pcol_copy) /* Failed before ownership transfer */
+ pcol_copy = pcol;
+ _unlock_pcol_pages(pcol_copy, ret, READ);
+ pcol_free(pcol_copy);
+ kfree(pcol_copy);
+
+ return ret;
+}
+
+/* readpage_strip is called either directly from readpage() or by the VFS from
+ * within read_cache_pages(), to add one more page to be read. It will try to
+ * collect as many contiguous pages as posible. If a discontinuity is
+ * encountered, or it runs out of resources, it will submit the previous segment
+ * and will start a new collection. Eventually caller must submit the last
+ * segment if present.
+ */
+static int readpage_strip(void *data, struct page *page)
+{
+ struct page_collect *pcol = data;
+ struct inode *inode = pcol->inode;
+ struct exofs_i_info *oi = exofs_i(inode);
+ loff_t i_size = i_size_read(inode);
+ pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT;
+ size_t len;
+ int ret;
+
+ BUG_ON(!PageLocked(page));
+
+ /* FIXME: Just for debugging, will be removed */
+ if (PageUptodate(page))
+ EXOFS_ERR("PageUptodate(0x%lx, 0x%lx)\n", pcol->inode->i_ino,
+ page->index);
+
+ pcol->that_locked_page = page;
+
+ if (page->index < end_index)
+ len = PAGE_CACHE_SIZE;
+ else if (page->index == end_index)
+ len = i_size & ~PAGE_CACHE_MASK;
+ else
+ len = 0;
+
+ if (!len || !obj_created(oi)) {
+ /* this will be out of bounds, or doesn't exist yet.
+ * Current page is cleared and the request is split
+ */
+ clear_highpage(page);
+
+ SetPageUptodate(page);
+ if (PageError(page))
+ ClearPageError(page);
+
+ if (!pcol->read_4_write)
+ unlock_page(page);
+ EXOFS_DBGMSG("readpage_strip(0x%lx) empty page len=%zx "
+ "read_4_write=%d index=0x%lx end_index=0x%lx "
+ "splitting\n", inode->i_ino, len,
+ pcol->read_4_write, page->index, end_index);
+
+ return read_exec(pcol);
+ }
+
+try_again:
+
+ if (unlikely(pcol->pg_first == -1)) {
+ pcol->pg_first = page->index;
+ } else if (unlikely((pcol->pg_first + pcol->nr_pages) !=
+ page->index)) {
+ /* Discontinuity detected, split the request */
+ ret = read_exec(pcol);
+ if (unlikely(ret))
+ goto fail;
+ goto try_again;
+ }
+
+ if (!pcol->pages) {
+ ret = pcol_try_alloc(pcol);
+ if (unlikely(ret))
+ goto fail;
+ }
+
+ if (len != PAGE_CACHE_SIZE)
+ zero_user(page, len, PAGE_CACHE_SIZE - len);
+
+ EXOFS_DBGMSG2(" readpage_strip(0x%lx, 0x%lx) len=0x%zx\n",
+ inode->i_ino, page->index, len);
+
+ ret = pcol_add_page(pcol, page, len);
+ if (ret) {
+ EXOFS_DBGMSG2("Failed pcol_add_page pages[i]=%p "
+ "this_len=0x%zx nr_pages=%u length=0x%lx\n",
+ page, len, pcol->nr_pages, pcol->length);
+
+ /* split the request, and start again with current page */
+ ret = read_exec(pcol);
+ if (unlikely(ret))
+ goto fail;
+
+ goto try_again;
+ }
+
+ return 0;
+
+fail:
+ /* SetPageError(page); ??? */
+ unlock_page(page);
+ return ret;
+}
+
+static int exofs_readpages(struct file *file, struct address_space *mapping,
+ struct list_head *pages, unsigned nr_pages)
+{
+ struct page_collect pcol;
+ int ret;
+
+ _pcol_init(&pcol, nr_pages, mapping->host);
+
+ ret = read_cache_pages(mapping, pages, readpage_strip, &pcol);
+ if (ret) {
+ EXOFS_ERR("read_cache_pages => %d\n", ret);
+ return ret;
+ }
+
+ ret = read_exec(&pcol);
+ if (unlikely(ret))
+ return ret;
+
+ return read_exec(&pcol);
+}
+
+static int _readpage(struct page *page, bool read_4_write)
+{
+ struct page_collect pcol;
+ int ret;
+
+ _pcol_init(&pcol, 1, page->mapping->host);
+
+ pcol.read_4_write = read_4_write;
+ ret = readpage_strip(&pcol, page);
+ if (ret) {
+ EXOFS_ERR("_readpage => %d\n", ret);
+ return ret;
+ }
+
+ return read_exec(&pcol);
+}
+
+/*
+ * We don't need the file
+ */
+static int exofs_readpage(struct file *file, struct page *page)
+{
+ return _readpage(page, false);
+}
+
+/* Callback for osd_write. All writes are asynchronous */
+static void writepages_done(struct ore_io_state *ios, void *p)
+{
+ struct page_collect *pcol = p;
+ int i;
+ u64 good_bytes;
+ u64 length = 0;
+ int ret = ore_check_io(ios, NULL);
+
+ atomic_dec(&pcol->sbi->s_curr_pending);
+
+ if (likely(!ret)) {
+ good_bytes = pcol->length;
+ ret = PAGE_WAS_NOT_IN_IO;
+ } else {
+ good_bytes = 0;
+ }
+
+ EXOFS_DBGMSG2("writepages_done(0x%lx) good_bytes=0x%llx"
+ " length=0x%lx nr_pages=%u\n",
+ pcol->inode->i_ino, _LLU(good_bytes), pcol->length,
+ pcol->nr_pages);
+
+ for (i = 0; i < pcol->nr_pages; i++) {
+ struct page *page = pcol->pages[i];
+ struct inode *inode = page->mapping->host;
+ int page_stat;
+
+ if (inode != pcol->inode)
+ continue; /* osd might add more pages to a bio */
+
+ if (likely(length < good_bytes))
+ page_stat = 0;
+ else
+ page_stat = ret;
+
+ update_write_page(page, page_stat);
+ unlock_page(page);
+ EXOFS_DBGMSG2(" writepages_done(0x%lx, 0x%lx) status=%d\n",
+ inode->i_ino, page->index, page_stat);
+
+ length += PAGE_SIZE;
+ }
+
+ pcol_free(pcol);
+ kfree(pcol);
+ EXOFS_DBGMSG2("writepages_done END\n");
+}
+
+static struct page *__r4w_get_page(void *priv, u64 offset, bool *uptodate)
+{
+ struct page_collect *pcol = priv;
+ pgoff_t index = offset / PAGE_SIZE;
+
+ if (!pcol->that_locked_page ||
+ (pcol->that_locked_page->index != index)) {
+ struct page *page;
+ loff_t i_size = i_size_read(pcol->inode);
+
+ if (offset >= i_size) {
+ *uptodate = true;
+ EXOFS_DBGMSG2("offset >= i_size index=0x%lx\n", index);
+ return ZERO_PAGE(0);
+ }
+
+ page = find_get_page(pcol->inode->i_mapping, index);
+ if (!page) {
+ page = find_or_create_page(pcol->inode->i_mapping,
+ index, GFP_NOFS);
+ if (unlikely(!page)) {
+ EXOFS_DBGMSG("grab_cache_page Failed "
+ "index=0x%llx\n", _LLU(index));
+ return NULL;
+ }
+ unlock_page(page);
+ }
+ if (PageDirty(page) || PageWriteback(page))
+ *uptodate = true;
+ else
+ *uptodate = PageUptodate(page);
+ EXOFS_DBGMSG2("index=0x%lx uptodate=%d\n", index, *uptodate);
+ return page;
+ } else {
+ EXOFS_DBGMSG2("YES that_locked_page index=0x%lx\n",
+ pcol->that_locked_page->index);
+ *uptodate = true;
+ return pcol->that_locked_page;
+ }
+}
+
+static void __r4w_put_page(void *priv, struct page *page)
+{
+ struct page_collect *pcol = priv;
+
+ if ((pcol->that_locked_page != page) && (ZERO_PAGE(0) != page)) {
+ EXOFS_DBGMSG2("index=0x%lx\n", page->index);
+ page_cache_release(page);
+ return;
+ }
+ EXOFS_DBGMSG2("that_locked_page index=0x%lx\n",
+ ZERO_PAGE(0) == page ? -1 : page->index);
+}
+
+static const struct _ore_r4w_op _r4w_op = {
+ .get_page = &__r4w_get_page,
+ .put_page = &__r4w_put_page,
+};
+
+static int write_exec(struct page_collect *pcol)
+{
+ struct exofs_i_info *oi = exofs_i(pcol->inode);
+ struct ore_io_state *ios;
+ struct page_collect *pcol_copy = NULL;
+ int ret;
+
+ if (!pcol->pages)
+ return 0;
+
+ BUG_ON(pcol->ios);
+ ret = ore_get_rw_state(&pcol->sbi->layout, &oi->oc, false,
+ pcol->pg_first << PAGE_CACHE_SHIFT,
+ pcol->length, &pcol->ios);
+ if (unlikely(ret))
+ goto err;
+
+ pcol_copy = kmalloc(sizeof(*pcol_copy), GFP_KERNEL);
+ if (!pcol_copy) {
+ EXOFS_ERR("write_exec: Failed to kmalloc(pcol)\n");
+ ret = -ENOMEM;
+ goto err;
+ }
+
+ *pcol_copy = *pcol;
+
+ ios = pcol->ios;
+ ios->pages = pcol_copy->pages;
+ ios->done = writepages_done;
+ ios->r4w = &_r4w_op;
+ ios->private = pcol_copy;
+
+ /* pages ownership was passed to pcol_copy */
+ _pcol_reset(pcol);
+
+ ret = _maybe_not_all_in_one_io(ios, pcol_copy, pcol);
+ if (unlikely(ret))
+ goto err;
+
+ EXOFS_DBGMSG2("write_exec(0x%lx) offset=0x%llx length=0x%llx\n",
+ pcol->inode->i_ino, _LLU(ios->offset), _LLU(ios->length));
+
+ ret = ore_write(ios);
+ if (unlikely(ret)) {
+ EXOFS_ERR("write_exec: ore_write() Failed\n");
+ goto err;
+ }
+
+ atomic_inc(&pcol->sbi->s_curr_pending);
+ return 0;
+
+err:
+ if (!pcol_copy) /* Failed before ownership transfer */
+ pcol_copy = pcol;
+ _unlock_pcol_pages(pcol_copy, ret, WRITE);
+ pcol_free(pcol_copy);
+ kfree(pcol_copy);
+
+ return ret;
+}
+
+/* writepage_strip is called either directly from writepage() or by the VFS from
+ * within write_cache_pages(), to add one more page to be written to storage.
+ * It will try to collect as many contiguous pages as possible. If a
+ * discontinuity is encountered or it runs out of resources it will submit the
+ * previous segment and will start a new collection.
+ * Eventually caller must submit the last segment if present.
+ */
+static int writepage_strip(struct page *page,
+ struct writeback_control *wbc_unused, void *data)
+{
+ struct page_collect *pcol = data;
+ struct inode *inode = pcol->inode;
+ struct exofs_i_info *oi = exofs_i(inode);
+ loff_t i_size = i_size_read(inode);
+ pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT;
+ size_t len;
+ int ret;
+
+ BUG_ON(!PageLocked(page));
+
+ ret = wait_obj_created(oi);
+ if (unlikely(ret))
+ goto fail;
+
+ if (page->index < end_index)
+ /* in this case, the page is within the limits of the file */
+ len = PAGE_CACHE_SIZE;
+ else {
+ len = i_size & ~PAGE_CACHE_MASK;
+
+ if (page->index > end_index || !len) {
+ /* in this case, the page is outside the limits
+ * (truncate in progress)
+ */
+ ret = write_exec(pcol);
+ if (unlikely(ret))
+ goto fail;
+ if (PageError(page))
+ ClearPageError(page);
+ unlock_page(page);
+ EXOFS_DBGMSG("writepage_strip(0x%lx, 0x%lx) "
+ "outside the limits\n",
+ inode->i_ino, page->index);
+ return 0;
+ }
+ }
+
+try_again:
+
+ if (unlikely(pcol->pg_first == -1)) {
+ pcol->pg_first = page->index;
+ } else if (unlikely((pcol->pg_first + pcol->nr_pages) !=
+ page->index)) {
+ /* Discontinuity detected, split the request */
+ ret = write_exec(pcol);
+ if (unlikely(ret))
+ goto fail;
+
+ EXOFS_DBGMSG("writepage_strip(0x%lx, 0x%lx) Discontinuity\n",
+ inode->i_ino, page->index);
+ goto try_again;
+ }
+
+ if (!pcol->pages) {
+ ret = pcol_try_alloc(pcol);
+ if (unlikely(ret))
+ goto fail;
+ }
+
+ EXOFS_DBGMSG2(" writepage_strip(0x%lx, 0x%lx) len=0x%zx\n",
+ inode->i_ino, page->index, len);
+
+ ret = pcol_add_page(pcol, page, len);
+ if (unlikely(ret)) {
+ EXOFS_DBGMSG2("Failed pcol_add_page "
+ "nr_pages=%u total_length=0x%lx\n",
+ pcol->nr_pages, pcol->length);
+
+ /* split the request, next loop will start again */
+ ret = write_exec(pcol);
+ if (unlikely(ret)) {
+ EXOFS_DBGMSG("write_exec failed => %d", ret);
+ goto fail;
+ }
+
+ goto try_again;
+ }
+
+ BUG_ON(PageWriteback(page));
+ set_page_writeback(page);
+
+ return 0;
+
+fail:
+ EXOFS_DBGMSG("Error: writepage_strip(0x%lx, 0x%lx)=>%d\n",
+ inode->i_ino, page->index, ret);
+ set_bit(AS_EIO, &page->mapping->flags);
+ unlock_page(page);
+ return ret;
+}
+
+static int exofs_writepages(struct address_space *mapping,
+ struct writeback_control *wbc)
+{
+ struct page_collect pcol;
+ long start, end, expected_pages;
+ int ret;
+
+ start = wbc->range_start >> PAGE_CACHE_SHIFT;
+ end = (wbc->range_end == LLONG_MAX) ?
+ start + mapping->nrpages :
+ wbc->range_end >> PAGE_CACHE_SHIFT;
+
+ if (start || end)
+ expected_pages = end - start + 1;
+ else
+ expected_pages = mapping->nrpages;
+
+ if (expected_pages < 32L)
+ expected_pages = 32L;
+
+ EXOFS_DBGMSG2("inode(0x%lx) wbc->start=0x%llx wbc->end=0x%llx "
+ "nrpages=%lu start=0x%lx end=0x%lx expected_pages=%ld\n",
+ mapping->host->i_ino, wbc->range_start, wbc->range_end,
+ mapping->nrpages, start, end, expected_pages);
+
+ _pcol_init(&pcol, expected_pages, mapping->host);
+
+ ret = write_cache_pages(mapping, wbc, writepage_strip, &pcol);
+ if (unlikely(ret)) {
+ EXOFS_ERR("write_cache_pages => %d\n", ret);
+ return ret;
+ }
+
+ ret = write_exec(&pcol);
+ if (unlikely(ret))
+ return ret;
+
+ if (wbc->sync_mode == WB_SYNC_ALL) {
+ return write_exec(&pcol); /* pump the last reminder */
+ } else if (pcol.nr_pages) {
+ /* not SYNC let the reminder join the next writeout */
+ unsigned i;
+
+ for (i = 0; i < pcol.nr_pages; i++) {
+ struct page *page = pcol.pages[i];
+
+ end_page_writeback(page);
+ set_page_dirty(page);
+ unlock_page(page);
+ }
+ }
+ return 0;
+}
+
+/*
+static int exofs_writepage(struct page *page, struct writeback_control *wbc)
+{
+ struct page_collect pcol;
+ int ret;
+
+ _pcol_init(&pcol, 1, page->mapping->host);
+
+ ret = writepage_strip(page, NULL, &pcol);
+ if (ret) {
+ EXOFS_ERR("exofs_writepage => %d\n", ret);
+ return ret;
+ }
+
+ return write_exec(&pcol);
+}
+*/
+/* i_mutex held using inode->i_size directly */
+static void _write_failed(struct inode *inode, loff_t to)
+{
+ if (to > inode->i_size)
+ truncate_pagecache(inode, inode->i_size);
+}
+
+int exofs_write_begin(struct file *file, struct address_space *mapping,
+ loff_t pos, unsigned len, unsigned flags,
+ struct page **pagep, void **fsdata)
+{
+ int ret = 0;
+ struct page *page;
+
+ page = *pagep;
+ if (page == NULL) {
+ ret = simple_write_begin(file, mapping, pos, len, flags, pagep,
+ fsdata);
+ if (ret) {
+ EXOFS_DBGMSG("simple_write_begin failed\n");
+ goto out;
+ }
+
+ page = *pagep;
+ }
+
+ /* read modify write */
+ if (!PageUptodate(page) && (len != PAGE_CACHE_SIZE)) {
+ loff_t i_size = i_size_read(mapping->host);
+ pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT;
+ size_t rlen;
+
+ if (page->index < end_index)
+ rlen = PAGE_CACHE_SIZE;
+ else if (page->index == end_index)
+ rlen = i_size & ~PAGE_CACHE_MASK;
+ else
+ rlen = 0;
+
+ if (!rlen) {
+ clear_highpage(page);
+ SetPageUptodate(page);
+ goto out;
+ }
+
+ ret = _readpage(page, true);
+ if (ret) {
+ /*SetPageError was done by _readpage. Is it ok?*/
+ unlock_page(page);
+ EXOFS_DBGMSG("__readpage failed\n");
+ }
+ }
+out:
+ if (unlikely(ret))
+ _write_failed(mapping->host, pos + len);
+
+ return ret;
+}
+
+static int exofs_write_begin_export(struct file *file,
+ struct address_space *mapping,
+ loff_t pos, unsigned len, unsigned flags,
+ struct page **pagep, void **fsdata)
+{
+ *pagep = NULL;
+
+ return exofs_write_begin(file, mapping, pos, len, flags, pagep,
+ fsdata);
+}
+
+static int exofs_write_end(struct file *file, struct address_space *mapping,
+ loff_t pos, unsigned len, unsigned copied,
+ struct page *page, void *fsdata)
+{
+ struct inode *inode = mapping->host;
+ /* According to comment in simple_write_end i_mutex is held */
+ loff_t i_size = inode->i_size;
+ int ret;
+
+ ret = simple_write_end(file, mapping,pos, len, copied, page, fsdata);
+ if (unlikely(ret))
+ _write_failed(inode, pos + len);
+
+ /* TODO: once simple_write_end marks inode dirty remove */
+ if (i_size != inode->i_size)
+ mark_inode_dirty(inode);
+ return ret;
+}
+
+static int exofs_releasepage(struct page *page, gfp_t gfp)
+{
+ EXOFS_DBGMSG("page 0x%lx\n", page->index);
+ WARN_ON(1);
+ return 0;
+}
+
+static void exofs_invalidatepage(struct page *page, unsigned int offset,
+ unsigned int length)
+{
+ EXOFS_DBGMSG("page 0x%lx offset 0x%x length 0x%x\n",
+ page->index, offset, length);
+ WARN_ON(1);
+}
+
+
+ /* TODO: Should be easy enough to do proprly */
+static ssize_t exofs_direct_IO(struct kiocb *iocb, struct iov_iter *iter,
+ loff_t offset)
+{
+ return 0;
+}
+
+const struct address_space_operations exofs_aops = {
+ .readpage = exofs_readpage,
+ .readpages = exofs_readpages,
+ .writepage = NULL,
+ .writepages = exofs_writepages,
+ .write_begin = exofs_write_begin_export,
+ .write_end = exofs_write_end,
+ .releasepage = exofs_releasepage,
+ .set_page_dirty = __set_page_dirty_nobuffers,
+ .invalidatepage = exofs_invalidatepage,
+
+ /* Not implemented Yet */
+ .bmap = NULL, /* TODO: use osd's OSD_ACT_READ_MAP */
+ .direct_IO = exofs_direct_IO,
+
+ /* With these NULL has special meaning or default is not exported */
+ .migratepage = NULL,
+ .launder_page = NULL,
+ .is_partially_uptodate = NULL,
+ .error_remove_page = NULL,
+};
+
+/******************************************************************************
+ * INODE OPERATIONS
+ *****************************************************************************/
+
+/*
+ * Test whether an inode is a fast symlink.
+ */
+static inline int exofs_inode_is_fast_symlink(struct inode *inode)
+{
+ struct exofs_i_info *oi = exofs_i(inode);
+
+ return S_ISLNK(inode->i_mode) && (oi->i_data[0] != 0);
+}
+
+static int _do_truncate(struct inode *inode, loff_t newsize)
+{
+ struct exofs_i_info *oi = exofs_i(inode);
+ struct exofs_sb_info *sbi = inode->i_sb->s_fs_info;
+ int ret;
+
+ inode->i_mtime = inode->i_ctime = CURRENT_TIME;
+
+ ret = ore_truncate(&sbi->layout, &oi->oc, (u64)newsize);
+ if (likely(!ret))
+ truncate_setsize(inode, newsize);
+
+ EXOFS_DBGMSG2("(0x%lx) size=0x%llx ret=>%d\n",
+ inode->i_ino, newsize, ret);
+ return ret;
+}
+
+/*
+ * Set inode attributes - update size attribute on OSD if needed,
+ * otherwise just call generic functions.
+ */
+int exofs_setattr(struct dentry *dentry, struct iattr *iattr)
+{
+ struct inode *inode = d_inode(dentry);
+ int error;
+
+ /* if we are about to modify an object, and it hasn't been
+ * created yet, wait
+ */
+ error = wait_obj_created(exofs_i(inode));
+ if (unlikely(error))
+ return error;
+
+ error = inode_change_ok(inode, iattr);
+ if (unlikely(error))
+ return error;
+
+ if ((iattr->ia_valid & ATTR_SIZE) &&
+ iattr->ia_size != i_size_read(inode)) {
+ error = _do_truncate(inode, iattr->ia_size);
+ if (unlikely(error))
+ return error;
+ }
+
+ setattr_copy(inode, iattr);
+ mark_inode_dirty(inode);
+ return 0;
+}
+
+static const struct osd_attr g_attr_inode_file_layout = ATTR_DEF(
+ EXOFS_APAGE_FS_DATA,
+ EXOFS_ATTR_INODE_FILE_LAYOUT,
+ 0);
+static const struct osd_attr g_attr_inode_dir_layout = ATTR_DEF(
+ EXOFS_APAGE_FS_DATA,
+ EXOFS_ATTR_INODE_DIR_LAYOUT,
+ 0);
+
+/*
+ * Read the Linux inode info from the OSD, and return it as is. In exofs the
+ * inode info is in an application specific page/attribute of the osd-object.
+ */
+static int exofs_get_inode(struct super_block *sb, struct exofs_i_info *oi,
+ struct exofs_fcb *inode)
+{
+ struct exofs_sb_info *sbi = sb->s_fs_info;
+ struct osd_attr attrs[] = {
+ [0] = g_attr_inode_data,
+ [1] = g_attr_inode_file_layout,
+ [2] = g_attr_inode_dir_layout,
+ };
+ struct ore_io_state *ios;
+ struct exofs_on_disk_inode_layout *layout;
+ int ret;
+
+ ret = ore_get_io_state(&sbi->layout, &oi->oc, &ios);
+ if (unlikely(ret)) {
+ EXOFS_ERR("%s: ore_get_io_state failed.\n", __func__);
+ return ret;
+ }
+
+ attrs[1].len = exofs_on_disk_inode_layout_size(sbi->oc.numdevs);
+ attrs[2].len = exofs_on_disk_inode_layout_size(sbi->oc.numdevs);
+
+ ios->in_attr = attrs;
+ ios->in_attr_len = ARRAY_SIZE(attrs);
+
+ ret = ore_read(ios);
+ if (unlikely(ret)) {
+ EXOFS_ERR("object(0x%llx) corrupted, return empty file=>%d\n",
+ _LLU(oi->one_comp.obj.id), ret);
+ memset(inode, 0, sizeof(*inode));
+ inode->i_mode = 0040000 | (0777 & ~022);
+ /* If object is lost on target we might as well enable it's
+ * delete.
+ */
+ ret = 0;
+ goto out;
+ }
+
+ ret = extract_attr_from_ios(ios, &attrs[0]);
+ if (ret) {
+ EXOFS_ERR("%s: extract_attr 0 of inode failed\n", __func__);
+ goto out;
+ }
+ WARN_ON(attrs[0].len != EXOFS_INO_ATTR_SIZE);
+ memcpy(inode, attrs[0].val_ptr, EXOFS_INO_ATTR_SIZE);
+
+ ret = extract_attr_from_ios(ios, &attrs[1]);
+ if (ret) {
+ EXOFS_ERR("%s: extract_attr 1 of inode failed\n", __func__);
+ goto out;
+ }
+ if (attrs[1].len) {
+ layout = attrs[1].val_ptr;
+ if (layout->gen_func != cpu_to_le16(LAYOUT_MOVING_WINDOW)) {
+ EXOFS_ERR("%s: unsupported files layout %d\n",
+ __func__, layout->gen_func);
+ ret = -ENOTSUPP;
+ goto out;
+ }
+ }
+
+ ret = extract_attr_from_ios(ios, &attrs[2]);
+ if (ret) {
+ EXOFS_ERR("%s: extract_attr 2 of inode failed\n", __func__);
+ goto out;
+ }
+ if (attrs[2].len) {
+ layout = attrs[2].val_ptr;
+ if (layout->gen_func != cpu_to_le16(LAYOUT_MOVING_WINDOW)) {
+ EXOFS_ERR("%s: unsupported meta-data layout %d\n",
+ __func__, layout->gen_func);
+ ret = -ENOTSUPP;
+ goto out;
+ }
+ }
+
+out:
+ ore_put_io_state(ios);
+ return ret;
+}
+
+static void __oi_init(struct exofs_i_info *oi)
+{
+ init_waitqueue_head(&oi->i_wq);
+ oi->i_flags = 0;
+}
+/*
+ * Fill in an inode read from the OSD and set it up for use
+ */
+struct inode *exofs_iget(struct super_block *sb, unsigned long ino)
+{
+ struct exofs_i_info *oi;
+ struct exofs_fcb fcb;
+ struct inode *inode;
+ int ret;
+
+ inode = iget_locked(sb, ino);
+ if (!inode)
+ return ERR_PTR(-ENOMEM);
+ if (!(inode->i_state & I_NEW))
+ return inode;
+ oi = exofs_i(inode);
+ __oi_init(oi);
+ exofs_init_comps(&oi->oc, &oi->one_comp, sb->s_fs_info,
+ exofs_oi_objno(oi));
+
+ /* read the inode from the osd */
+ ret = exofs_get_inode(sb, oi, &fcb);
+ if (ret)
+ goto bad_inode;
+
+ set_obj_created(oi);
+
+ /* copy stuff from on-disk struct to in-memory struct */
+ inode->i_mode = le16_to_cpu(fcb.i_mode);
+ i_uid_write(inode, le32_to_cpu(fcb.i_uid));
+ i_gid_write(inode, le32_to_cpu(fcb.i_gid));
+ set_nlink(inode, le16_to_cpu(fcb.i_links_count));
+ inode->i_ctime.tv_sec = (signed)le32_to_cpu(fcb.i_ctime);
+ inode->i_atime.tv_sec = (signed)le32_to_cpu(fcb.i_atime);
+ inode->i_mtime.tv_sec = (signed)le32_to_cpu(fcb.i_mtime);
+ inode->i_ctime.tv_nsec =
+ inode->i_atime.tv_nsec = inode->i_mtime.tv_nsec = 0;
+ oi->i_commit_size = le64_to_cpu(fcb.i_size);
+ i_size_write(inode, oi->i_commit_size);
+ inode->i_blkbits = EXOFS_BLKSHIFT;
+ inode->i_generation = le32_to_cpu(fcb.i_generation);
+
+ oi->i_dir_start_lookup = 0;
+
+ if ((inode->i_nlink == 0) && (inode->i_mode == 0)) {
+ ret = -ESTALE;
+ goto bad_inode;
+ }
+
+ if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
+ if (fcb.i_data[0])
+ inode->i_rdev =
+ old_decode_dev(le32_to_cpu(fcb.i_data[0]));
+ else
+ inode->i_rdev =
+ new_decode_dev(le32_to_cpu(fcb.i_data[1]));
+ } else {
+ memcpy(oi->i_data, fcb.i_data, sizeof(fcb.i_data));
+ }
+
+ if (S_ISREG(inode->i_mode)) {
+ inode->i_op = &exofs_file_inode_operations;
+ inode->i_fop = &exofs_file_operations;
+ inode->i_mapping->a_ops = &exofs_aops;
+ } else if (S_ISDIR(inode->i_mode)) {
+ inode->i_op = &exofs_dir_inode_operations;
+ inode->i_fop = &exofs_dir_operations;
+ inode->i_mapping->a_ops = &exofs_aops;
+ } else if (S_ISLNK(inode->i_mode)) {
+ if (exofs_inode_is_fast_symlink(inode))
+ inode->i_op = &exofs_fast_symlink_inode_operations;
+ else {
+ inode->i_op = &exofs_symlink_inode_operations;
+ inode->i_mapping->a_ops = &exofs_aops;
+ }
+ } else {
+ inode->i_op = &exofs_special_inode_operations;
+ if (fcb.i_data[0])
+ init_special_inode(inode, inode->i_mode,
+ old_decode_dev(le32_to_cpu(fcb.i_data[0])));
+ else
+ init_special_inode(inode, inode->i_mode,
+ new_decode_dev(le32_to_cpu(fcb.i_data[1])));
+ }
+
+ unlock_new_inode(inode);
+ return inode;
+
+bad_inode:
+ iget_failed(inode);
+ return ERR_PTR(ret);
+}
+
+int __exofs_wait_obj_created(struct exofs_i_info *oi)
+{
+ if (!obj_created(oi)) {
+ EXOFS_DBGMSG("!obj_created\n");
+ BUG_ON(!obj_2bcreated(oi));
+ wait_event(oi->i_wq, obj_created(oi));
+ EXOFS_DBGMSG("wait_event done\n");
+ }
+ return unlikely(is_bad_inode(&oi->vfs_inode)) ? -EIO : 0;
+}
+
+/*
+ * Callback function from exofs_new_inode(). The important thing is that we
+ * set the obj_created flag so that other methods know that the object exists on
+ * the OSD.
+ */
+static void create_done(struct ore_io_state *ios, void *p)
+{
+ struct inode *inode = p;
+ struct exofs_i_info *oi = exofs_i(inode);
+ struct exofs_sb_info *sbi = inode->i_sb->s_fs_info;
+ int ret;
+
+ ret = ore_check_io(ios, NULL);
+ ore_put_io_state(ios);
+
+ atomic_dec(&sbi->s_curr_pending);
+
+ if (unlikely(ret)) {
+ EXOFS_ERR("object=0x%llx creation failed in pid=0x%llx",
+ _LLU(exofs_oi_objno(oi)),
+ _LLU(oi->one_comp.obj.partition));
+ /*TODO: When FS is corrupted creation can fail, object already
+ * exist. Get rid of this asynchronous creation, if exist
+ * increment the obj counter and try the next object. Until we
+ * succeed. All these dangling objects will be made into lost
+ * files by chkfs.exofs
+ */
+ }
+
+ set_obj_created(oi);
+
+ wake_up(&oi->i_wq);
+}
+
+/*
+ * Set up a new inode and create an object for it on the OSD
+ */
+struct inode *exofs_new_inode(struct inode *dir, umode_t mode)
+{
+ struct super_block *sb = dir->i_sb;
+ struct exofs_sb_info *sbi = sb->s_fs_info;
+ struct inode *inode;
+ struct exofs_i_info *oi;
+ struct ore_io_state *ios;
+ int ret;
+
+ inode = new_inode(sb);
+ if (!inode)
+ return ERR_PTR(-ENOMEM);
+
+ oi = exofs_i(inode);
+ __oi_init(oi);
+
+ set_obj_2bcreated(oi);
+
+ inode_init_owner(inode, dir, mode);
+ inode->i_ino = sbi->s_nextid++;
+ inode->i_blkbits = EXOFS_BLKSHIFT;
+ inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
+ oi->i_commit_size = inode->i_size = 0;
+ spin_lock(&sbi->s_next_gen_lock);
+ inode->i_generation = sbi->s_next_generation++;
+ spin_unlock(&sbi->s_next_gen_lock);
+ insert_inode_hash(inode);
+
+ exofs_init_comps(&oi->oc, &oi->one_comp, sb->s_fs_info,
+ exofs_oi_objno(oi));
+ exofs_sbi_write_stats(sbi); /* Make sure new sbi->s_nextid is on disk */
+
+ mark_inode_dirty(inode);
+
+ ret = ore_get_io_state(&sbi->layout, &oi->oc, &ios);
+ if (unlikely(ret)) {
+ EXOFS_ERR("exofs_new_inode: ore_get_io_state failed\n");
+ return ERR_PTR(ret);
+ }
+
+ ios->done = create_done;
+ ios->private = inode;
+
+ ret = ore_create(ios);
+ if (ret) {
+ ore_put_io_state(ios);
+ return ERR_PTR(ret);
+ }
+ atomic_inc(&sbi->s_curr_pending);
+
+ return inode;
+}
+
+/*
+ * struct to pass two arguments to update_inode's callback
+ */
+struct updatei_args {
+ struct exofs_sb_info *sbi;
+ struct exofs_fcb fcb;
+};
+
+/*
+ * Callback function from exofs_update_inode().
+ */
+static void updatei_done(struct ore_io_state *ios, void *p)
+{
+ struct updatei_args *args = p;
+
+ ore_put_io_state(ios);
+
+ atomic_dec(&args->sbi->s_curr_pending);
+
+ kfree(args);
+}
+
+/*
+ * Write the inode to the OSD. Just fill up the struct, and set the attribute
+ * synchronously or asynchronously depending on the do_sync flag.
+ */
+static int exofs_update_inode(struct inode *inode, int do_sync)
+{
+ struct exofs_i_info *oi = exofs_i(inode);
+ struct super_block *sb = inode->i_sb;
+ struct exofs_sb_info *sbi = sb->s_fs_info;
+ struct ore_io_state *ios;
+ struct osd_attr attr;
+ struct exofs_fcb *fcb;
+ struct updatei_args *args;
+ int ret;
+
+ args = kzalloc(sizeof(*args), GFP_KERNEL);
+ if (!args) {
+ EXOFS_DBGMSG("Failed kzalloc of args\n");
+ return -ENOMEM;
+ }
+
+ fcb = &args->fcb;
+
+ fcb->i_mode = cpu_to_le16(inode->i_mode);
+ fcb->i_uid = cpu_to_le32(i_uid_read(inode));
+ fcb->i_gid = cpu_to_le32(i_gid_read(inode));
+ fcb->i_links_count = cpu_to_le16(inode->i_nlink);
+ fcb->i_ctime = cpu_to_le32(inode->i_ctime.tv_sec);
+ fcb->i_atime = cpu_to_le32(inode->i_atime.tv_sec);
+ fcb->i_mtime = cpu_to_le32(inode->i_mtime.tv_sec);
+ oi->i_commit_size = i_size_read(inode);
+ fcb->i_size = cpu_to_le64(oi->i_commit_size);
+ fcb->i_generation = cpu_to_le32(inode->i_generation);
+
+ if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
+ if (old_valid_dev(inode->i_rdev)) {
+ fcb->i_data[0] =
+ cpu_to_le32(old_encode_dev(inode->i_rdev));
+ fcb->i_data[1] = 0;
+ } else {
+ fcb->i_data[0] = 0;
+ fcb->i_data[1] =
+ cpu_to_le32(new_encode_dev(inode->i_rdev));
+ fcb->i_data[2] = 0;
+ }
+ } else
+ memcpy(fcb->i_data, oi->i_data, sizeof(fcb->i_data));
+
+ ret = ore_get_io_state(&sbi->layout, &oi->oc, &ios);
+ if (unlikely(ret)) {
+ EXOFS_ERR("%s: ore_get_io_state failed.\n", __func__);
+ goto free_args;
+ }
+
+ attr = g_attr_inode_data;
+ attr.val_ptr = fcb;
+ ios->out_attr_len = 1;
+ ios->out_attr = &attr;
+
+ wait_obj_created(oi);
+
+ if (!do_sync) {
+ args->sbi = sbi;
+ ios->done = updatei_done;
+ ios->private = args;
+ }
+
+ ret = ore_write(ios);
+ if (!do_sync && !ret) {
+ atomic_inc(&sbi->s_curr_pending);
+ goto out; /* deallocation in updatei_done */
+ }
+
+ ore_put_io_state(ios);
+free_args:
+ kfree(args);
+out:
+ EXOFS_DBGMSG("(0x%lx) do_sync=%d ret=>%d\n",
+ inode->i_ino, do_sync, ret);
+ return ret;
+}
+
+int exofs_write_inode(struct inode *inode, struct writeback_control *wbc)
+{
+ /* FIXME: fix fsync and use wbc->sync_mode == WB_SYNC_ALL */
+ return exofs_update_inode(inode, 1);
+}
+
+/*
+ * Callback function from exofs_delete_inode() - don't have much cleaning up to
+ * do.
+ */
+static void delete_done(struct ore_io_state *ios, void *p)
+{
+ struct exofs_sb_info *sbi = p;
+
+ ore_put_io_state(ios);
+
+ atomic_dec(&sbi->s_curr_pending);
+}
+
+/*
+ * Called when the refcount of an inode reaches zero. We remove the object
+ * from the OSD here. We make sure the object was created before we try and
+ * delete it.
+ */
+void exofs_evict_inode(struct inode *inode)
+{
+ struct exofs_i_info *oi = exofs_i(inode);
+ struct super_block *sb = inode->i_sb;
+ struct exofs_sb_info *sbi = sb->s_fs_info;
+ struct ore_io_state *ios;
+ int ret;
+
+ truncate_inode_pages_final(&inode->i_data);
+
+ /* TODO: should do better here */
+ if (inode->i_nlink || is_bad_inode(inode))
+ goto no_delete;
+
+ inode->i_size = 0;
+ clear_inode(inode);
+
+ /* if we are deleting an obj that hasn't been created yet, wait.
+ * This also makes sure that create_done cannot be called with an
+ * already evicted inode.
+ */
+ wait_obj_created(oi);
+ /* ignore the error, attempt a remove anyway */
+
+ /* Now Remove the OSD objects */
+ ret = ore_get_io_state(&sbi->layout, &oi->oc, &ios);
+ if (unlikely(ret)) {
+ EXOFS_ERR("%s: ore_get_io_state failed\n", __func__);
+ return;
+ }
+
+ ios->done = delete_done;
+ ios->private = sbi;
+
+ ret = ore_remove(ios);
+ if (ret) {
+ EXOFS_ERR("%s: ore_remove failed\n", __func__);
+ ore_put_io_state(ios);
+ return;
+ }
+ atomic_inc(&sbi->s_curr_pending);
+
+ return;
+
+no_delete:
+ clear_inode(inode);
+}