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>
This commit is contained in:
Boaz Harrosh
parent
982980d753
commit
beaec07ba6
@ -130,6 +130,9 @@ static inline struct exofs_i_info *exofs_i(struct inode *inode)
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/* inode.c */
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void exofs_truncate(struct inode *inode);
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int exofs_setattr(struct dentry *, struct iattr *);
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int exofs_write_begin(struct file *file, struct address_space *mapping,
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loff_t pos, unsigned len, unsigned flags,
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struct page **pagep, void **fsdata);
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/*********************
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* operation vectors *
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@ -138,6 +141,9 @@ int exofs_setattr(struct dentry *, struct iattr *);
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extern const struct inode_operations exofs_file_inode_operations;
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extern const struct file_operations exofs_file_operations;
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/* inode.c */
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extern const struct address_space_operations exofs_aops;
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/* symlink.c */
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extern const struct inode_operations exofs_symlink_inode_operations;
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extern const struct inode_operations exofs_fast_symlink_inode_operations;
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697
fs/exofs/inode.c
697
fs/exofs/inode.c
@ -35,6 +35,7 @@
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#include <linux/writeback.h>
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#include <linux/buffer_head.h>
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#include <scsi/scsi_device.h>
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#include "exofs.h"
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@ -42,6 +43,702 @@
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# define EXOFS_DEBUG_OBJ_ISIZE 1
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#endif
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struct page_collect {
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struct exofs_sb_info *sbi;
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struct request_queue *req_q;
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struct inode *inode;
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unsigned expected_pages;
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struct bio *bio;
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unsigned nr_pages;
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unsigned long length;
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loff_t pg_first; /* keep 64bit also in 32-arches */
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};
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static void _pcol_init(struct page_collect *pcol, unsigned expected_pages,
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struct inode *inode)
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{
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struct exofs_sb_info *sbi = inode->i_sb->s_fs_info;
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struct request_queue *req_q = sbi->s_dev->scsi_device->request_queue;
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pcol->sbi = sbi;
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pcol->req_q = req_q;
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pcol->inode = inode;
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pcol->expected_pages = expected_pages;
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pcol->bio = NULL;
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pcol->nr_pages = 0;
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pcol->length = 0;
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pcol->pg_first = -1;
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EXOFS_DBGMSG("_pcol_init ino=0x%lx expected_pages=%u\n", inode->i_ino,
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expected_pages);
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}
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static void _pcol_reset(struct page_collect *pcol)
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{
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pcol->expected_pages -= min(pcol->nr_pages, pcol->expected_pages);
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pcol->bio = NULL;
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pcol->nr_pages = 0;
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pcol->length = 0;
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pcol->pg_first = -1;
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EXOFS_DBGMSG("_pcol_reset ino=0x%lx expected_pages=%u\n",
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pcol->inode->i_ino, pcol->expected_pages);
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/* this is probably the end of the loop but in writes
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* it might not end here. don't be left with nothing
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*/
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if (!pcol->expected_pages)
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pcol->expected_pages = 128;
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}
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static int pcol_try_alloc(struct page_collect *pcol)
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{
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int pages = min_t(unsigned, pcol->expected_pages, BIO_MAX_PAGES);
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for (; pages; pages >>= 1) {
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pcol->bio = bio_alloc(GFP_KERNEL, pages);
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if (likely(pcol->bio))
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return 0;
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}
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EXOFS_ERR("Failed to kcalloc expected_pages=%u\n",
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pcol->expected_pages);
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return -ENOMEM;
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}
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static void pcol_free(struct page_collect *pcol)
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{
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bio_put(pcol->bio);
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pcol->bio = NULL;
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}
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static int pcol_add_page(struct page_collect *pcol, struct page *page,
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unsigned len)
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{
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int added_len = bio_add_pc_page(pcol->req_q, pcol->bio, page, len, 0);
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if (unlikely(len != added_len))
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return -ENOMEM;
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++pcol->nr_pages;
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pcol->length += len;
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return 0;
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}
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static int update_read_page(struct page *page, int ret)
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{
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if (ret == 0) {
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/* Everything is OK */
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SetPageUptodate(page);
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if (PageError(page))
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ClearPageError(page);
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} else if (ret == -EFAULT) {
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/* In this case we were trying to read something that wasn't on
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* disk yet - return a page full of zeroes. This should be OK,
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* because the object should be empty (if there was a write
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* before this read, the read would be waiting with the page
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* locked */
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clear_highpage(page);
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SetPageUptodate(page);
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if (PageError(page))
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ClearPageError(page);
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ret = 0; /* recovered error */
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EXOFS_DBGMSG("recovered read error\n");
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} else /* Error */
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SetPageError(page);
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return ret;
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}
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static void update_write_page(struct page *page, int ret)
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{
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if (ret) {
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mapping_set_error(page->mapping, ret);
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SetPageError(page);
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}
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end_page_writeback(page);
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}
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/* Called at the end of reads, to optionally unlock pages and update their
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* status.
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*/
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static int __readpages_done(struct osd_request *or, struct page_collect *pcol,
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bool do_unlock)
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{
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struct bio_vec *bvec;
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int i;
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u64 resid;
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u64 good_bytes;
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u64 length = 0;
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int ret = exofs_check_ok_resid(or, &resid, NULL);
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osd_end_request(or);
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if (likely(!ret))
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good_bytes = pcol->length;
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else if (!resid)
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good_bytes = 0;
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else
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good_bytes = pcol->length - resid;
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EXOFS_DBGMSG("readpages_done(0x%lx) good_bytes=0x%llx"
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" length=0x%lx nr_pages=%u\n",
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pcol->inode->i_ino, _LLU(good_bytes), pcol->length,
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pcol->nr_pages);
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__bio_for_each_segment(bvec, pcol->bio, i, 0) {
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struct page *page = bvec->bv_page;
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struct inode *inode = page->mapping->host;
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int page_stat;
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if (inode != pcol->inode)
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continue; /* osd might add more pages at end */
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if (likely(length < good_bytes))
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page_stat = 0;
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else
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page_stat = ret;
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EXOFS_DBGMSG(" readpages_done(0x%lx, 0x%lx) %s\n",
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inode->i_ino, page->index,
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page_stat ? "bad_bytes" : "good_bytes");
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ret = update_read_page(page, page_stat);
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if (do_unlock)
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unlock_page(page);
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length += bvec->bv_len;
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}
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pcol_free(pcol);
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EXOFS_DBGMSG("readpages_done END\n");
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return ret;
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}
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/* callback of async reads */
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static void readpages_done(struct osd_request *or, void *p)
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{
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struct page_collect *pcol = p;
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__readpages_done(or, pcol, true);
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atomic_dec(&pcol->sbi->s_curr_pending);
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kfree(p);
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}
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static void _unlock_pcol_pages(struct page_collect *pcol, int ret, int rw)
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{
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struct bio_vec *bvec;
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int i;
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__bio_for_each_segment(bvec, pcol->bio, i, 0) {
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struct page *page = bvec->bv_page;
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if (rw == READ)
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update_read_page(page, ret);
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else
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update_write_page(page, ret);
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unlock_page(page);
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}
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pcol_free(pcol);
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}
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static int read_exec(struct page_collect *pcol, bool is_sync)
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{
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struct exofs_i_info *oi = exofs_i(pcol->inode);
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struct osd_obj_id obj = {pcol->sbi->s_pid,
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pcol->inode->i_ino + EXOFS_OBJ_OFF};
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struct osd_request *or = NULL;
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struct page_collect *pcol_copy = NULL;
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loff_t i_start = pcol->pg_first << PAGE_CACHE_SHIFT;
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int ret;
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if (!pcol->bio)
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return 0;
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/* see comment in _readpage() about sync reads */
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WARN_ON(is_sync && (pcol->nr_pages != 1));
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or = osd_start_request(pcol->sbi->s_dev, GFP_KERNEL);
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if (unlikely(!or)) {
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ret = -ENOMEM;
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goto err;
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}
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osd_req_read(or, &obj, pcol->bio, i_start);
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if (is_sync) {
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exofs_sync_op(or, pcol->sbi->s_timeout, oi->i_cred);
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return __readpages_done(or, pcol, false);
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}
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pcol_copy = kmalloc(sizeof(*pcol_copy), GFP_KERNEL);
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if (!pcol_copy) {
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ret = -ENOMEM;
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goto err;
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}
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*pcol_copy = *pcol;
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ret = exofs_async_op(or, readpages_done, pcol_copy, oi->i_cred);
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if (unlikely(ret))
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goto err;
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atomic_inc(&pcol->sbi->s_curr_pending);
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EXOFS_DBGMSG("read_exec obj=0x%llx start=0x%llx length=0x%lx\n",
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obj.id, _LLU(i_start), pcol->length);
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/* pages ownership was passed to pcol_copy */
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_pcol_reset(pcol);
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return 0;
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err:
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if (!is_sync)
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_unlock_pcol_pages(pcol, ret, READ);
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kfree(pcol_copy);
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if (or)
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osd_end_request(or);
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return ret;
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}
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/* readpage_strip is called either directly from readpage() or by the VFS from
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* within read_cache_pages(), to add one more page to be read. It will try to
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* collect as many contiguous pages as posible. If a discontinuity is
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* encountered, or it runs out of resources, it will submit the previous segment
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* and will start a new collection. Eventually caller must submit the last
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* segment if present.
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*/
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static int readpage_strip(void *data, struct page *page)
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{
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struct page_collect *pcol = data;
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struct inode *inode = pcol->inode;
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struct exofs_i_info *oi = exofs_i(inode);
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loff_t i_size = i_size_read(inode);
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pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT;
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size_t len;
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int ret;
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/* FIXME: Just for debugging, will be removed */
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if (PageUptodate(page))
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EXOFS_ERR("PageUptodate(0x%lx, 0x%lx)\n", pcol->inode->i_ino,
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page->index);
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if (page->index < end_index)
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len = PAGE_CACHE_SIZE;
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else if (page->index == end_index)
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len = i_size & ~PAGE_CACHE_MASK;
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else
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len = 0;
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if (!len || !obj_created(oi)) {
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/* this will be out of bounds, or doesn't exist yet.
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* Current page is cleared and the request is split
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*/
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clear_highpage(page);
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SetPageUptodate(page);
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if (PageError(page))
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ClearPageError(page);
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unlock_page(page);
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EXOFS_DBGMSG("readpage_strip(0x%lx, 0x%lx) empty page,"
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" splitting\n", inode->i_ino, page->index);
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return read_exec(pcol, false);
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}
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try_again:
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if (unlikely(pcol->pg_first == -1)) {
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pcol->pg_first = page->index;
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} else if (unlikely((pcol->pg_first + pcol->nr_pages) !=
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page->index)) {
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/* Discontinuity detected, split the request */
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ret = read_exec(pcol, false);
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if (unlikely(ret))
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goto fail;
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goto try_again;
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}
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if (!pcol->bio) {
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ret = pcol_try_alloc(pcol);
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if (unlikely(ret))
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goto fail;
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}
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if (len != PAGE_CACHE_SIZE)
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zero_user(page, len, PAGE_CACHE_SIZE - len);
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EXOFS_DBGMSG(" readpage_strip(0x%lx, 0x%lx) len=0x%zx\n",
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inode->i_ino, page->index, len);
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ret = pcol_add_page(pcol, page, len);
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if (ret) {
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EXOFS_DBGMSG("Failed pcol_add_page pages[i]=%p "
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"this_len=0x%zx nr_pages=%u length=0x%lx\n",
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page, len, pcol->nr_pages, pcol->length);
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/* split the request, and start again with current page */
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ret = read_exec(pcol, false);
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if (unlikely(ret))
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goto fail;
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goto try_again;
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}
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return 0;
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fail:
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/* SetPageError(page); ??? */
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unlock_page(page);
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return ret;
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}
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static int exofs_readpages(struct file *file, struct address_space *mapping,
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struct list_head *pages, unsigned nr_pages)
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{
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struct page_collect pcol;
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int ret;
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_pcol_init(&pcol, nr_pages, mapping->host);
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ret = read_cache_pages(mapping, pages, readpage_strip, &pcol);
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if (ret) {
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EXOFS_ERR("read_cache_pages => %d\n", ret);
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return ret;
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}
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return read_exec(&pcol, false);
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}
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static int _readpage(struct page *page, bool is_sync)
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{
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struct page_collect pcol;
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int ret;
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_pcol_init(&pcol, 1, page->mapping->host);
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/* readpage_strip might call read_exec(,async) inside at several places
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* but this is safe for is_async=0 since read_exec will not do anything
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* when we have a single page.
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*/
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ret = readpage_strip(&pcol, page);
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if (ret) {
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EXOFS_ERR("_readpage => %d\n", ret);
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return ret;
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}
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return read_exec(&pcol, is_sync);
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}
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/*
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* We don't need the file
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*/
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static int exofs_readpage(struct file *file, struct page *page)
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{
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return _readpage(page, false);
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}
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/* Callback for osd_write. All writes are asynchronouse */
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static void writepages_done(struct osd_request *or, void *p)
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{
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struct page_collect *pcol = p;
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struct bio_vec *bvec;
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int i;
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u64 resid;
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u64 good_bytes;
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u64 length = 0;
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int ret = exofs_check_ok_resid(or, NULL, &resid);
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osd_end_request(or);
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atomic_dec(&pcol->sbi->s_curr_pending);
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if (likely(!ret))
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good_bytes = pcol->length;
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else if (!resid)
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good_bytes = 0;
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else
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good_bytes = pcol->length - resid;
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EXOFS_DBGMSG("writepages_done(0x%lx) good_bytes=0x%llx"
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" length=0x%lx nr_pages=%u\n",
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pcol->inode->i_ino, _LLU(good_bytes), pcol->length,
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pcol->nr_pages);
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__bio_for_each_segment(bvec, pcol->bio, i, 0) {
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struct page *page = bvec->bv_page;
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struct inode *inode = page->mapping->host;
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int page_stat;
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if (inode != pcol->inode)
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continue; /* osd might add more pages to a bio */
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if (likely(length < good_bytes))
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page_stat = 0;
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else
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page_stat = ret;
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update_write_page(page, page_stat);
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unlock_page(page);
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EXOFS_DBGMSG(" writepages_done(0x%lx, 0x%lx) status=%d\n",
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inode->i_ino, page->index, page_stat);
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length += bvec->bv_len;
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}
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pcol_free(pcol);
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kfree(pcol);
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EXOFS_DBGMSG("writepages_done END\n");
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}
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static int write_exec(struct page_collect *pcol)
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{
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struct exofs_i_info *oi = exofs_i(pcol->inode);
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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(0x%lx, 0x%llx) start=0x%llx length=0x%lx\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;
|
||||
}
|
||||
|
||||
/* 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);
|
||||
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(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_DBGMSG("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 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(0x%lx) wbc->start=0x%llx wbc->end=0x%llx"
|
||||
" m->nrpages=%lu start=0x%lx end=0x%lx\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
|
||||
*****************************************************************************/
|
||||
|
||||
Loading…
Reference in New Issue
Block a user