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-rw-r--r--fs/exofs/inode.c1514
1 files changed, 0 insertions, 1514 deletions
diff --git a/fs/exofs/inode.c b/fs/exofs/inode.c
deleted file mode 100644
index 5f81fcd383a4..000000000000
--- a/fs/exofs/inode.c
+++ /dev/null
@@ -1,1514 +0,0 @@
-/*
- * 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_array(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_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_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_SIZE;
- else if (page->index == end_index)
- len = i_size & ~PAGE_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_SIZE)
- zero_user(page, len, PAGE_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);
- }
- *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);
- put_page(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_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_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_SIZE;
- else {
- len = i_size & ~PAGE_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);
- mapping_set_error(page->mapping, -EIO);
- 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_SHIFT;
- end = (wbc->range_end == LLONG_MAX) ?
- start + mapping->nrpages :
- wbc->range_end >> PAGE_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) {
- page = grab_cache_page_write_begin(mapping, pos >> PAGE_SHIFT,
- flags);
- if (!page) {
- EXOFS_DBGMSG("grab_cache_page_write_begin failed\n");
- return -ENOMEM;
- }
- *pagep = page;
- }
-
- /* read modify write */
- if (!PageUptodate(page) && (len != PAGE_SIZE)) {
- loff_t i_size = i_size_read(mapping->host);
- pgoff_t end_index = i_size >> PAGE_SHIFT;
-
- if (page->index > end_index) {
- clear_highpage(page);
- SetPageUptodate(page);
- } else {
- ret = _readpage(page, true);
- if (ret) {
- unlock_page(page);
- EXOFS_DBGMSG("__readpage failed\n");
- }
- }
- }
- 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;
- loff_t last_pos = pos + copied;
-
- if (!PageUptodate(page)) {
- if (copied < len) {
- _write_failed(inode, pos + len);
- copied = 0;
- goto out;
- }
- SetPageUptodate(page);
- }
- if (last_pos > inode->i_size) {
- i_size_write(inode, last_pos);
- mark_inode_dirty(inode);
- }
- set_page_dirty(page);
-out:
- unlock_page(page);
- put_page(page);
- return copied;
-}
-
-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)
-{
- 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(inode);
-
- 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 = setattr_prepare(dentry, 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 = &simple_symlink_inode_operations;
- inode->i_link = (char *)oi->i_data;
- } else {
- inode->i_op = &page_symlink_inode_operations;
- inode_nohighmem(inode);
- 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(inode);
- 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);
-}