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    Subject[PATCH 4/8 ver5] exofs: address_space_operations

    OK Now we start to read and write from osd-objects. We try to
    collect at most contiguous pages as possible in a single write/read.
    The first page index is the object's offset.

    TODO:
    In 64-bit a single bio can carry at most 128 pages.
    Add support of chaining multiple bios

    Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
    ---
    fs/exofs/exofs.h | 6 +
    fs/exofs/inode.c | 691 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
    2 files changed, 697 insertions(+), 0 deletions(-)

    diff --git a/fs/exofs/exofs.h b/fs/exofs/exofs.h
    index d3b8bde..f30de6e 100644
    --- a/fs/exofs/exofs.h
    +++ b/fs/exofs/exofs.h
    @@ -130,6 +130,9 @@ static inline struct exofs_i_info *exofs_i(struct inode *inode)
    /* inode.c */
    void exofs_truncate(struct inode *inode);
    int exofs_setattr(struct dentry *, struct iattr *);
    +int exofs_write_begin(struct file *file, struct address_space *mapping,
    + loff_t pos, unsigned len, unsigned flags,
    + struct page **pagep, void **fsdata);

    /*********************
    * operation vectors *
    @@ -138,6 +141,9 @@ int exofs_setattr(struct dentry *, struct iattr *);
    extern const struct inode_operations exofs_file_inode_operations;
    extern const struct file_operations exofs_file_operations;

    +/* inode.c */
    +extern const struct address_space_operations exofs_aops;
    +
    /* symlink.c */
    extern const struct inode_operations exofs_symlink_inode_operations;
    extern const struct inode_operations exofs_fast_symlink_inode_operations;
    diff --git a/fs/exofs/inode.c b/fs/exofs/inode.c
    index b0bda1e..ab7b56e 100644
    --- a/fs/exofs/inode.c
    +++ b/fs/exofs/inode.c
    @@ -35,6 +35,7 @@

    #include <linux/writeback.h>
    #include <linux/buffer_head.h>
    +#include <scsi/scsi_device.h>

    #include "exofs.h"

    @@ -42,6 +43,696 @@
    # define EXOFS_DEBUG_OBJ_ISIZE 1
    #endif

    +struct page_collect {
    + struct exofs_sb_info *sbi;
    + struct request_queue *req_q;
    + struct inode *inode;
    + unsigned expected_pages;
    +
    + struct bio *bio;
    + unsigned nr_pages;
    + unsigned long length;
    + long pg_first;
    +};
    +
    +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;
    + struct request_queue *req_q = sbi->s_dev->scsi_device->request_queue;
    +
    + pcol->sbi = sbi;
    + pcol->req_q = req_q;
    + pcol->inode = inode;
    + pcol->expected_pages = expected_pages;
    +
    + pcol->bio = NULL;
    + pcol->nr_pages = 0;
    + pcol->length = 0;
    + pcol->pg_first = -1;
    +
    + EXOFS_DBGMSG("_pcol_init ino=0x%lx expected_pages=%u\n", inode->i_ino,
    + expected_pages);
    +}
    +
    +static void _pcol_reset(struct page_collect *pcol)
    +{
    + pcol->expected_pages -= min(pcol->nr_pages, pcol->expected_pages);
    +
    + pcol->bio = NULL;
    + pcol->nr_pages = 0;
    + pcol->length = 0;
    + pcol->pg_first = -1;
    + EXOFS_DBGMSG("_pcol_reset ino=0x%lx expected_pages=%u\n",
    + pcol->inode->i_ino, pcol->expected_pages);
    +
    + /* 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 = 128;
    +}
    +
    +static int pcol_try_alloc(struct page_collect *pcol)
    +{
    + int pages = min_t(unsigned, pcol->expected_pages, BIO_MAX_PAGES);
    +
    + for (; pages; pages >>= 1) {
    + pcol->bio = bio_alloc(GFP_KERNEL, pages);
    + if (likely(pcol->bio))
    + return 0;
    + }
    +
    + EXOFS_ERR("Failed to kcalloc expected_pages=%u\n",
    + pcol->expected_pages);
    + return -ENOMEM;
    +}
    +
    +static void pcol_free(struct page_collect *pcol)
    +{
    + bio_put(pcol->bio);
    + pcol->bio = NULL;
    +}
    +
    +static int pcol_add_page(struct page_collect *pcol, struct page *page,
    + unsigned len)
    +{
    + int added_len = bio_add_pc_page(pcol->req_q, pcol->bio, page, len, 0);
    + if (unlikely(len != added_len))
    + return -ENOMEM;
    +
    + ++pcol->nr_pages;
    + pcol->length += len;
    + return 0;
    +}
    +
    +static int update_read_page(struct page *page, int ret)
    +{
    + if (ret == 0) {
    + /* Everything is OK */
    + SetPageUptodate(page);
    + if (PageError(page))
    + ClearPageError(page);
    + } else if (ret == -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);
    + ret = 0; /* recovered error */
    + } else /* Error */
    + SetPageError(page);
    +
    + return ret;
    +}
    +
    +static void update_write_page(struct page *page, int ret)
    +{
    + if (ret) {
    + mapping_set_error(page->mapping, ret);
    + SetPageError(page);
    + }
    + end_page_writeback(page);
    +}
    +
    +static int _readpage(struct page *page, bool is_sync);
    +
    +static int __readpages_done(struct osd_request *or, struct page_collect *pcol,
    + bool do_unlock)
    +{
    + struct bio_vec *bvec;
    + int i;
    + u64 resid;
    + u64 good_bytes;
    + u64 length = 0;
    + int ret = exofs_check_ok_resid(or, &resid, NULL);
    +
    + osd_end_request(or);
    +
    + if (likely(!ret))
    + good_bytes = pcol->length;
    + else if (!resid)
    + good_bytes = 0;
    + else
    + good_bytes = pcol->length - resid;
    +
    + EXOFS_DBGMSG("readpages_done(%ld) good_bytes=%llx"
    + " length=%zx nr_pages=%u\n",
    + pcol->inode->i_ino, _LLU(good_bytes), pcol->length,
    + pcol->nr_pages);
    +
    + __bio_for_each_segment(bvec, pcol->bio, i, 0) {
    + struct page *page = bvec->bv_page;
    + struct inode *inode = page->mapping->host;
    +
    + if (inode != pcol->inode)
    + continue; /* osd might add more pages at end */
    +
    + if ((length < good_bytes) || (i == 0)) {
    + ret = update_read_page(page, (i == 0) ? ret : 0);
    + if (do_unlock)
    + unlock_page(page);
    + EXOFS_DBGMSG(" readpages_done(%ld, %ld)\n",
    + inode->i_ino, page->index);
    + } else {
    + /* can not happen on single sync_readpage */
    + BUG_ON(!do_unlock);
    +
    + /* try a single page read and only then it is
    + * marked as SetPageError()
    + */
    + EXOFS_ERR(" readpages_done(%ld, %ld) bad_bytes\n",
    + inode->i_ino, page->index);
    + _readpage(page, false);
    + }
    +
    + length += bvec->bv_len;
    + }
    +
    + pcol_free(pcol);
    + EXOFS_DBGMSG("readpages_done END\n");
    + return ret;
    +}
    +
    +static void readpages_done(struct osd_request *or, void *p)
    +{
    + struct page_collect *pcol = p;
    +
    + __readpages_done(or, pcol, true);
    + atomic_dec(&pcol->sbi->s_curr_pending);
    + kfree(p);
    +}
    +
    +static void _unlock_pcol_pages(struct page_collect *pcol, int ret, int rw)
    +{
    + struct bio_vec *bvec;
    + int i;
    +
    + __bio_for_each_segment(bvec, pcol->bio, i, 0) {
    + struct page *page = bvec->bv_page;
    +
    + if (rw == READ)
    + update_read_page(page, ret);
    + else
    + update_write_page(page, ret);
    +
    + unlock_page(page);
    + }
    + pcol_free(pcol);
    +}
    +
    +static int read_exec(struct page_collect *pcol, bool is_sync)
    +{
    + struct exofs_i_info *oi = exofs_i(pcol->inode);
    + struct osd_obj_id obj = {pcol->sbi->s_pid,
    + pcol->inode->i_ino + EXOFS_OBJ_OFF};
    + struct osd_request *or = NULL;
    + struct page_collect *pcol_copy = NULL;
    + loff_t i_start = pcol->pg_first << PAGE_CACHE_SHIFT;
    + int ret;
    +
    + if (!pcol->bio)
    + return 0;
    +
    + /* see comment in _readpage() about sync reads */
    + WARN_ON(is_sync && (pcol->nr_pages != 1));
    +
    + or = osd_start_request(pcol->sbi->s_dev, GFP_KERNEL);
    + if (unlikely(!or)) {
    + ret = -ENOMEM;
    + goto err;
    + }
    +
    + osd_req_read(or, &obj, pcol->bio, i_start);
    +
    + if (is_sync) {
    + exofs_sync_op(or, pcol->sbi->s_timeout, oi->i_cred);
    + return __readpages_done(or, pcol, false);
    + }
    +
    + pcol_copy = kmalloc(sizeof(*pcol_copy), GFP_KERNEL);
    + if (!pcol_copy) {
    + ret = -ENOMEM;
    + goto err;
    + }
    +
    + *pcol_copy = *pcol;
    + ret = exofs_async_op(or, readpages_done, pcol_copy, oi->i_cred);
    + if (unlikely(ret))
    + goto err;
    +
    + atomic_inc(&pcol->sbi->s_curr_pending);
    +
    + EXOFS_DBGMSG("read_exec obj=%llx start=%llx length=%zx\n",
    + obj.id, _LLU(i_start), pcol->length);
    +
    + /* pages ownership was passed to pcol_copy */
    + _pcol_reset(pcol);
    + return 0;
    +
    +err:
    + if (!is_sync)
    + _unlock_pcol_pages(pcol, ret, READ);
    + kfree(pcol_copy);
    + if (or)
    + osd_end_request(or);
    + return ret;
    +}
    +
    +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;
    +
    + /* FIXME: Just for debugging, will be removed */
    + if (PageUptodate(page))
    + EXOFS_ERR("PageUptodate(%ld, %ld)\n", pcol->inode->i_ino,
    + page->index);
    +
    + 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);
    +
    + unlock_page(page);
    + EXOFS_DBGMSG("readpage_strip(%ld, %ld) empty page, splitting\n",
    + inode->i_ino, page->index);
    +
    + return read_exec(pcol, false);
    + }
    +
    +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, false);
    + if (unlikely(ret))
    + goto fail;
    + goto try_again;
    + }
    +
    + if (!pcol->bio) {
    + ret = pcol_try_alloc(pcol);
    + if (unlikely(ret))
    + goto fail;
    + }
    +
    + if (len != PAGE_CACHE_SIZE)
    + zero_user(page, len, PAGE_CACHE_SIZE - len);
    +
    + EXOFS_DBGMSG(" readpage_strip(%ld, %ld) len=%zx\n", inode->i_ino,
    + page->index, len);
    +
    + ret = pcol_add_page(pcol, page, len);
    + if (ret) {
    + EXOFS_DBGMSG("Failed pcol_add_page pages[i]=%p "
    + "len=%zx nr_pages=%u length=%zx\n",
    + page, len, pcol->nr_pages, pcol->length);
    +
    + /* split the request, and start again with current page */
    + ret = read_exec(pcol, false);
    + 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;
    + }
    +
    + return read_exec(&pcol, false);
    +}
    +
    +static int _readpage(struct page *page, bool is_sync)
    +{
    + struct page_collect pcol;
    + int ret;
    +
    + _pcol_init(&pcol, 1, page->mapping->host);
    +
    + /* readpage_strip might call read_exec(,async) inside at several places
    + * but this is safe for is_async=0 since read_exec will not do anything
    + * when we have a single page.
    + */
    + ret = readpage_strip(&pcol, page);
    + if (ret) {
    + EXOFS_ERR("_readpage => %d\n", ret);
    + return ret;
    + }
    +
    + return read_exec(&pcol, is_sync);
    +}
    +
    +/*
    + * We don't need the file
    + */
    +static int exofs_readpage(struct file *file, struct page *page)
    +{
    + return _readpage(page, false);
    +}
    +
    +static int exofs_writepage(struct page *page, struct writeback_control *wbc2);
    +
    +static void writepages_done(struct osd_request *or, void *p)
    +{
    + struct page_collect *pcol = p;
    + struct bio_vec *bvec;
    + int i;
    + u64 resid;
    + u64 good_bytes;
    + u64 length = 0;
    +
    + int ret = exofs_check_ok_resid(or, NULL, &resid);
    +
    + osd_end_request(or);
    + atomic_dec(&pcol->sbi->s_curr_pending);
    +
    + if (likely(!ret))
    + good_bytes = pcol->length;
    + else if (!resid)
    + good_bytes = 0;
    + else
    + good_bytes = pcol->length - resid;
    +
    + EXOFS_DBGMSG("writepages_done(%lx) good_bytes=%llx"
    + " length=%zx nr_pages=%u\n",
    + pcol->inode->i_ino, _LLU(good_bytes), pcol->length,
    + pcol->nr_pages);
    +
    + __bio_for_each_segment(bvec, pcol->bio, i, 0) {
    + struct page *page = bvec->bv_page;
    + struct inode *inode = page->mapping->host;
    +
    + if (inode != pcol->inode)
    + continue; /* osd might add more pages to a bio */
    +
    + if ((length < good_bytes) || (i == 0)) {
    + update_write_page(page, ret);
    + unlock_page(page);
    + EXOFS_DBGMSG(" writepages_done(%lx, %lx)"
    + " good_bytes ret=%x\n",
    + inode->i_ino, page->index, ret);
    + } else {
    + /* try a single page write and only then it is
    + * marked as SetPageError()
    + */
    + EXOFS_ERR(" writepages_done(%lx, %lx) bad_bytes\n",
    + inode->i_ino, page->index);
    +
    + exofs_writepage(page, NULL);
    + }
    +
    + length += bvec->bv_len;
    + }
    +
    + pcol_free(pcol);
    + kfree(pcol);
    + EXOFS_DBGMSG("writepages_done END\n");
    +}
    +
    +static int write_exec(struct page_collect *pcol)
    +{
    + struct exofs_i_info *oi = exofs_i(pcol->inode);
    + struct osd_obj_id obj = {pcol->sbi->s_pid,
    + pcol->inode->i_ino + EXOFS_OBJ_OFF};
    + struct osd_request *or = NULL;
    + struct page_collect *pcol_copy = NULL;
    + loff_t i_start = pcol->pg_first << PAGE_CACHE_SHIFT;
    + int ret;
    +
    + if (!pcol->bio)
    + return 0;
    +
    + or = osd_start_request(pcol->sbi->s_dev, GFP_KERNEL);
    + if (unlikely(!or)) {
    + EXOFS_ERR("write_exec: Faild to osd_start_request()\n");
    + ret = -ENOMEM;
    + goto err;
    + }
    +
    + pcol_copy = kmalloc(sizeof(*pcol_copy), GFP_KERNEL);
    + if (!pcol_copy) {
    + EXOFS_ERR("write_exec: Faild to kmalloc(pcol)\n");
    + ret = -ENOMEM;
    + goto err;
    + }
    +
    + *pcol_copy = *pcol;
    +
    + osd_req_write(or, &obj, pcol_copy->bio, i_start);
    + ret = exofs_async_op(or, writepages_done, pcol_copy, oi->i_cred);
    + if (unlikely(ret)) {
    + EXOFS_ERR("write_exec: exofs_async_op() Faild\n");
    + goto err;
    + }
    +
    + atomic_inc(&pcol->sbi->s_curr_pending);
    + EXOFS_DBGMSG("write_exec(%lx, %lx) start=%llx length=%zx\n",
    + pcol->inode->i_ino, pcol->pg_first, _LLU(i_start),
    + pcol->length);
    + /* pages ownership was passed to pcol_copy */
    + _pcol_reset(pcol);
    + return 0;
    +
    +err:
    + _unlock_pcol_pages(pcol, ret, WRITE);
    + kfree(pcol_copy);
    + if (or)
    + osd_end_request(or);
    + return ret;
    +}
    +
    +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);
    + 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;
    + goto try_again;
    + }
    +
    + if (!pcol->bio) {
    + ret = pcol_try_alloc(pcol);
    + if (unlikely(ret))
    + goto fail;
    + }
    +
    + EXOFS_DBGMSG(" writepage_strip(%lx, %lx) len=%zx\n", inode->i_ino,
    + page->index, len);
    +
    + ret = pcol_add_page(pcol, page, len);
    + if (unlikely(ret)) {
    + EXOFS_DBGMSG("Failed pcol_add_page "
    + "nr_pages=%u total_length=%zx\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 faild => %d", ret);
    + goto fail;
    + }
    +
    + goto try_again;
    + }
    +
    + BUG_ON(PageWriteback(page));
    + set_page_writeback(page);
    +
    + return 0;
    +
    +fail:
    + 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 = min(end - start + 1, 32L);
    + else
    + expected_pages = mapping->nrpages;
    +
    + EXOFS_DBGMSG("inode(%lx) wbc->start=0x%llx wbc->end=0x%llx"
    + " m->nrpages=%lu start=%ld end=%ld\n",
    + mapping->host->i_ino, wbc->range_start, wbc->range_end,
    + mapping->nrpages, start, end);
    +
    + _pcol_init(&pcol, expected_pages, mapping->host);
    +
    + ret = write_cache_pages(mapping, wbc, writepage_strip, &pcol);
    + if (ret) {
    + EXOFS_ERR("write_cache_pages => %d\n", ret);
    + return ret;
    + }
    +
    + return write_exec(&pcol);
    +}
    +
    +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);
    +}
    +
    +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 faild\n");
    + return ret;
    + }
    +
    + page = *pagep;
    + }
    +
    + /* read modify write */
    + if (!PageUptodate(page) && (len != PAGE_CACHE_SIZE)) {
    + ret = _readpage(page, true);
    + if (ret) {
    + /*SetPageError was done by _readpage. Is it ok?*/
    + unlock_page(page);
    + EXOFS_DBGMSG("__readpage_filler faild\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);
    +}
    +
    +const struct address_space_operations exofs_aops = {
    + .readpage = exofs_readpage,
    + .readpages = exofs_readpages,
    + .writepage = exofs_writepage,
    + .writepages = exofs_writepages,
    + .write_begin = exofs_write_begin_export,
    + .write_end = simple_write_end,
    +};
    +
    /******************************************************************************
    * INODE OPERATIONS
    *****************************************************************************/
    --
    1.6.2.1



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