![Boaz Harrosh](/assets/img/avatar_default.png)
exofs uses simple_write_end() for it's .write_end handler. But it is not enough because simple_write_end() does not call mark_inode_dirty() when it extends i_size. So even if we do call mark_inode_dirty at beginning of write out, with a very long IO and a saturated system we might get the .write_inode() called while still extend-writing to file and miss out on the last i_size updates. So override .write_end, call simple_write_end(), and afterwords if i_size was changed call mark_inode_dirty(). It stands to logic that since simple_write_end() was the one extending i_size it should also call mark_inode_dirty(). But it looks like all users of simple_write_end() are memory-bound pseudo filesystems, who could careless about mark_inode_dirty(). I might submit a warning-comment patch to simple_write_end() in future. CC: Stable <stable@kernel.org> Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
1315 lines
31 KiB
C
1315 lines
31 KiB
C
/*
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* Copyright (C) 2005, 2006
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* Avishay Traeger (avishay@gmail.com)
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* Copyright (C) 2008, 2009
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* Boaz Harrosh <bharrosh@panasas.com>
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*
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* Copyrights for code taken from ext2:
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* Copyright (C) 1992, 1993, 1994, 1995
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* Remy Card (card@masi.ibp.fr)
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* Laboratoire MASI - Institut Blaise Pascal
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* Universite Pierre et Marie Curie (Paris VI)
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* from
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* linux/fs/minix/inode.c
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* Copyright (C) 1991, 1992 Linus Torvalds
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*
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* This file is part of exofs.
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*
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* exofs is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation. Since it is based on ext2, and the only
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* valid version of GPL for the Linux kernel is version 2, the only valid
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* version of GPL for exofs is version 2.
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*
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* exofs is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with exofs; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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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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#define EXOFS_DBGMSG2(M...) do {} while (0)
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enum { BIO_MAX_PAGES_KMALLOC =
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(PAGE_SIZE - sizeof(struct bio)) / sizeof(struct bio_vec),
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};
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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 exofs_io_state *ios;
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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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pcol->sbi = sbi;
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/* Create master bios on first Q, later on cloning, each clone will be
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* allocated on it's destination Q
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*/
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pcol->req_q = osd_request_queue(sbi->s_ods[0]);
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pcol->inode = inode;
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pcol->expected_pages = expected_pages;
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pcol->ios = NULL;
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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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}
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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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pcol->ios = NULL;
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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 = BIO_MAX_PAGES_KMALLOC;
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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,
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BIO_MAX_PAGES_KMALLOC);
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if (!pcol->ios) { /* First time allocate io_state */
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int ret = exofs_get_io_state(pcol->sbi, &pcol->ios);
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if (ret)
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return ret;
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}
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for (; pages; pages >>= 1) {
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pcol->bio = bio_kmalloc(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 bio_kmalloc 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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if (pcol->bio) {
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bio_put(pcol->bio);
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pcol->bio = NULL;
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}
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if (pcol->ios) {
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exofs_put_io_state(pcol->ios);
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pcol->ios = NULL;
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}
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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 page_collect *pcol, 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_io(pcol->ios, &resid);
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if (likely(!ret))
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good_bytes = pcol->length;
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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_DBGMSG2(" 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 exofs_io_state *ios, void *p)
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{
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struct page_collect *pcol = p;
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__readpages_done(pcol, true);
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atomic_dec(&pcol->sbi->s_curr_pending);
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kfree(pcol);
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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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}
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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 exofs_io_state *ios = pcol->ios;
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struct page_collect *pcol_copy = NULL;
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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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ios->bio = pcol->bio;
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ios->length = pcol->length;
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ios->offset = pcol->pg_first << PAGE_CACHE_SHIFT;
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if (is_sync) {
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exofs_oi_read(oi, pcol->ios);
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return __readpages_done(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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ios->done = readpages_done;
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ios->private = pcol_copy;
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ret = exofs_oi_read(oi, ios);
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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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ios->obj.id, _LLU(ios->offset), 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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pcol_free(pcol);
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kfree(pcol_copy);
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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_DBGMSG2(" 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_DBGMSG2("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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|
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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(,is_sync==false) at several
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* places but not if 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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|
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return read_exec(&pcol, is_sync);
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}
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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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|
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/* Callback for osd_write. All writes are asynchronous */
|
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static void writepages_done(struct exofs_io_state *ios, 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_io(ios, &resid);
|
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|
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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
|
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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) {
|
|
struct page *page = bvec->bv_page;
|
|
struct inode *inode = page->mapping->host;
|
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int page_stat;
|
|
|
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if (inode != pcol->inode)
|
|
continue; /* osd might add more pages to a bio */
|
|
|
|
if (likely(length < good_bytes))
|
|
page_stat = 0;
|
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else
|
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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);
|
|
|
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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 exofs_io_state *ios = pcol->ios;
|
|
struct page_collect *pcol_copy = NULL;
|
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int ret;
|
|
|
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if (!pcol->bio)
|
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return 0;
|
|
|
|
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;
|
|
|
|
pcol_copy->bio->bi_rw |= (1 << BIO_RW); /* FIXME: bio_set_dir() */
|
|
|
|
ios->bio = pcol_copy->bio;
|
|
ios->offset = pcol_copy->pg_first << PAGE_CACHE_SHIFT;
|
|
ios->length = pcol_copy->length;
|
|
ios->done = writepages_done;
|
|
ios->private = pcol_copy;
|
|
|
|
ret = exofs_oi_write(oi, ios);
|
|
if (unlikely(ret)) {
|
|
EXOFS_ERR("write_exec: exofs_oi_write() 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(ios->offset),
|
|
pcol->length);
|
|
/* pages ownership was passed to pcol_copy */
|
|
_pcol_reset(pcol);
|
|
return 0;
|
|
|
|
err:
|
|
_unlock_pcol_pages(pcol, ret, WRITE);
|
|
pcol_free(pcol);
|
|
kfree(pcol_copy);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* writepage_strip is called either directly from writepage() or by the VFS from
|
|
* within write_cache_pages(), to add one more page to be written to storage.
|
|
* It will try to collect as many contiguous pages as possible. If a
|
|
* discontinuity is encountered or it runs out of resources it will submit the
|
|
* previous segment and will start a new collection.
|
|
* Eventually caller must submit the last segment if present.
|
|
*/
|
|
static int writepage_strip(struct page *page,
|
|
struct writeback_control *wbc_unused, void *data)
|
|
{
|
|
struct page_collect *pcol = data;
|
|
struct inode *inode = pcol->inode;
|
|
struct exofs_i_info *oi = exofs_i(inode);
|
|
loff_t i_size = i_size_read(inode);
|
|
pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT;
|
|
size_t len;
|
|
int ret;
|
|
|
|
BUG_ON(!PageLocked(page));
|
|
|
|
ret = wait_obj_created(oi);
|
|
if (unlikely(ret))
|
|
goto fail;
|
|
|
|
if (page->index < end_index)
|
|
/* in this case, the page is within the limits of the file */
|
|
len = PAGE_CACHE_SIZE;
|
|
else {
|
|
len = i_size & ~PAGE_CACHE_MASK;
|
|
|
|
if (page->index > end_index || !len) {
|
|
/* in this case, the page is outside the limits
|
|
* (truncate in progress)
|
|
*/
|
|
ret = write_exec(pcol);
|
|
if (unlikely(ret))
|
|
goto fail;
|
|
if (PageError(page))
|
|
ClearPageError(page);
|
|
unlock_page(page);
|
|
EXOFS_DBGMSG("writepage_strip(0x%lx, 0x%lx) "
|
|
"outside the limits\n",
|
|
inode->i_ino, page->index);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
try_again:
|
|
|
|
if (unlikely(pcol->pg_first == -1)) {
|
|
pcol->pg_first = page->index;
|
|
} else if (unlikely((pcol->pg_first + pcol->nr_pages) !=
|
|
page->index)) {
|
|
/* Discontinuity detected, split the request */
|
|
ret = write_exec(pcol);
|
|
if (unlikely(ret))
|
|
goto fail;
|
|
|
|
EXOFS_DBGMSG("writepage_strip(0x%lx, 0x%lx) Discontinuity\n",
|
|
inode->i_ino, page->index);
|
|
goto try_again;
|
|
}
|
|
|
|
if (!pcol->bio) {
|
|
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_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:
|
|
EXOFS_DBGMSG("Error: writepage_strip(0x%lx, 0x%lx)=>%d\n",
|
|
inode->i_ino, page->index, ret);
|
|
set_bit(AS_EIO, &page->mapping->flags);
|
|
unlock_page(page);
|
|
return ret;
|
|
}
|
|
|
|
static int exofs_writepages(struct address_space *mapping,
|
|
struct writeback_control *wbc)
|
|
{
|
|
struct page_collect pcol;
|
|
long start, end, expected_pages;
|
|
int ret;
|
|
|
|
start = wbc->range_start >> PAGE_CACHE_SHIFT;
|
|
end = (wbc->range_end == LLONG_MAX) ?
|
|
start + mapping->nrpages :
|
|
wbc->range_end >> PAGE_CACHE_SHIFT;
|
|
|
|
if (start || end)
|
|
expected_pages = end - start + 1;
|
|
else
|
|
expected_pages = mapping->nrpages;
|
|
|
|
if (expected_pages < 32L)
|
|
expected_pages = 32L;
|
|
|
|
EXOFS_DBGMSG("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 (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);
|
|
}
|
|
|
|
static int exofs_write_end(struct file *file, struct address_space *mapping,
|
|
loff_t pos, unsigned len, unsigned copied,
|
|
struct page *page, void *fsdata)
|
|
{
|
|
struct inode *inode = mapping->host;
|
|
/* According to comment in simple_write_end i_mutex is held */
|
|
loff_t i_size = inode->i_size;
|
|
int ret;
|
|
|
|
ret = simple_write_end(file, mapping,pos, len, copied, page, fsdata);
|
|
if (i_size != inode->i_size)
|
|
mark_inode_dirty(inode);
|
|
return ret;
|
|
}
|
|
|
|
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 = exofs_write_end,
|
|
};
|
|
|
|
/******************************************************************************
|
|
* 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);
|
|
}
|
|
|
|
/*
|
|
* get_block_t - Fill in a buffer_head
|
|
* An OSD takes care of block allocation so we just fake an allocation by
|
|
* putting in the inode's sector_t in the buffer_head.
|
|
* TODO: What about the case of create==0 and @iblock does not exist in the
|
|
* object?
|
|
*/
|
|
static int exofs_get_block(struct inode *inode, sector_t iblock,
|
|
struct buffer_head *bh_result, int create)
|
|
{
|
|
map_bh(bh_result, inode->i_sb, iblock);
|
|
return 0;
|
|
}
|
|
|
|
const struct osd_attr g_attr_logical_length = ATTR_DEF(
|
|
OSD_APAGE_OBJECT_INFORMATION, OSD_ATTR_OI_LOGICAL_LENGTH, 8);
|
|
|
|
static int _do_truncate(struct inode *inode)
|
|
{
|
|
struct exofs_i_info *oi = exofs_i(inode);
|
|
loff_t isize = i_size_read(inode);
|
|
int ret;
|
|
|
|
inode->i_mtime = inode->i_ctime = CURRENT_TIME;
|
|
|
|
nobh_truncate_page(inode->i_mapping, isize, exofs_get_block);
|
|
|
|
ret = exofs_oi_truncate(oi, (u64)isize);
|
|
EXOFS_DBGMSG("(0x%lx) size=0x%llx\n", inode->i_ino, isize);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Truncate a file to the specified size - all we have to do is set the size
|
|
* attribute. We make sure the object exists first.
|
|
*/
|
|
void exofs_truncate(struct inode *inode)
|
|
{
|
|
struct exofs_i_info *oi = exofs_i(inode);
|
|
int ret;
|
|
|
|
if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
|
|
|| S_ISLNK(inode->i_mode)))
|
|
return;
|
|
if (exofs_inode_is_fast_symlink(inode))
|
|
return;
|
|
if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
|
|
return;
|
|
|
|
/* if we are about to truncate an object, and it hasn't been
|
|
* created yet, wait
|
|
*/
|
|
if (unlikely(wait_obj_created(oi)))
|
|
goto fail;
|
|
|
|
ret = _do_truncate(inode);
|
|
if (ret)
|
|
goto fail;
|
|
|
|
out:
|
|
mark_inode_dirty(inode);
|
|
return;
|
|
fail:
|
|
make_bad_inode(inode);
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Set inode attributes - just call generic functions.
|
|
*/
|
|
int exofs_setattr(struct dentry *dentry, struct iattr *iattr)
|
|
{
|
|
struct inode *inode = dentry->d_inode;
|
|
int error;
|
|
|
|
error = inode_change_ok(inode, iattr);
|
|
if (error)
|
|
return error;
|
|
|
|
error = inode_setattr(inode, iattr);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Read an inode from the OSD, and return it as is. We also return the size
|
|
* attribute in the 'obj_size' argument.
|
|
*/
|
|
static int exofs_get_inode(struct super_block *sb, struct exofs_i_info *oi,
|
|
struct exofs_fcb *inode, uint64_t *obj_size)
|
|
{
|
|
struct exofs_sb_info *sbi = sb->s_fs_info;
|
|
struct osd_attr attrs[2];
|
|
struct exofs_io_state *ios;
|
|
int ret;
|
|
|
|
*obj_size = ~0;
|
|
ret = exofs_get_io_state(sbi, &ios);
|
|
if (unlikely(ret)) {
|
|
EXOFS_ERR("%s: exofs_get_io_state failed.\n", __func__);
|
|
return ret;
|
|
}
|
|
|
|
ios->obj.id = exofs_oi_objno(oi);
|
|
exofs_make_credential(oi->i_cred, &ios->obj);
|
|
ios->cred = oi->i_cred;
|
|
|
|
attrs[0] = g_attr_inode_data;
|
|
attrs[1] = g_attr_logical_length;
|
|
ios->in_attr = attrs;
|
|
ios->in_attr_len = ARRAY_SIZE(attrs);
|
|
|
|
ret = exofs_sbi_read(ios);
|
|
if (ret)
|
|
goto out;
|
|
|
|
ret = extract_attr_from_ios(ios, &attrs[0]);
|
|
if (ret) {
|
|
EXOFS_ERR("%s: extract_attr of inode_data 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 of logical_length failed\n",
|
|
__func__);
|
|
goto out;
|
|
}
|
|
*obj_size = get_unaligned_be64(attrs[1].val_ptr);
|
|
|
|
out:
|
|
exofs_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;
|
|
uint64_t obj_size;
|
|
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);
|
|
|
|
/* read the inode from the osd */
|
|
ret = exofs_get_inode(sb, oi, &fcb, &obj_size);
|
|
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);
|
|
inode->i_uid = le32_to_cpu(fcb.i_uid);
|
|
inode->i_gid = le32_to_cpu(fcb.i_gid);
|
|
inode->i_nlink = 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);
|
|
|
|
if ((inode->i_size != obj_size) &&
|
|
(!exofs_inode_is_fast_symlink(inode))) {
|
|
EXOFS_ERR("WARNING: Size of inode=%llu != object=%llu\n",
|
|
inode->i_size, _LLU(obj_size));
|
|
/* FIXME: call exofs_inode_recovery() */
|
|
}
|
|
|
|
oi->i_dir_start_lookup = 0;
|
|
|
|
if ((inode->i_nlink == 0) && (inode->i_mode == 0)) {
|
|
ret = -ESTALE;
|
|
goto bad_inode;
|
|
}
|
|
|
|
if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
|
|
if (fcb.i_data[0])
|
|
inode->i_rdev =
|
|
old_decode_dev(le32_to_cpu(fcb.i_data[0]));
|
|
else
|
|
inode->i_rdev =
|
|
new_decode_dev(le32_to_cpu(fcb.i_data[1]));
|
|
} else {
|
|
memcpy(oi->i_data, fcb.i_data, sizeof(fcb.i_data));
|
|
}
|
|
|
|
if (S_ISREG(inode->i_mode)) {
|
|
inode->i_op = &exofs_file_inode_operations;
|
|
inode->i_fop = &exofs_file_operations;
|
|
inode->i_mapping->a_ops = &exofs_aops;
|
|
} else if (S_ISDIR(inode->i_mode)) {
|
|
inode->i_op = &exofs_dir_inode_operations;
|
|
inode->i_fop = &exofs_dir_operations;
|
|
inode->i_mapping->a_ops = &exofs_aops;
|
|
} else if (S_ISLNK(inode->i_mode)) {
|
|
if (exofs_inode_is_fast_symlink(inode))
|
|
inode->i_op = &exofs_fast_symlink_inode_operations;
|
|
else {
|
|
inode->i_op = &exofs_symlink_inode_operations;
|
|
inode->i_mapping->a_ops = &exofs_aops;
|
|
}
|
|
} else {
|
|
inode->i_op = &exofs_special_inode_operations;
|
|
if (fcb.i_data[0])
|
|
init_special_inode(inode, inode->i_mode,
|
|
old_decode_dev(le32_to_cpu(fcb.i_data[0])));
|
|
else
|
|
init_special_inode(inode, inode->i_mode,
|
|
new_decode_dev(le32_to_cpu(fcb.i_data[1])));
|
|
}
|
|
|
|
unlock_new_inode(inode);
|
|
return inode;
|
|
|
|
bad_inode:
|
|
iget_failed(inode);
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
int __exofs_wait_obj_created(struct exofs_i_info *oi)
|
|
{
|
|
if (!obj_created(oi)) {
|
|
BUG_ON(!obj_2bcreated(oi));
|
|
wait_event(oi->i_wq, obj_created(oi));
|
|
}
|
|
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 exofs_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 = exofs_check_io(ios, NULL);
|
|
exofs_put_io_state(ios);
|
|
|
|
atomic_dec(&sbi->s_curr_pending);
|
|
|
|
if (unlikely(ret)) {
|
|
EXOFS_ERR("object=0x%llx creation faild in pid=0x%llx",
|
|
_LLU(exofs_oi_objno(oi)), _LLU(sbi->s_pid));
|
|
/*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);
|
|
|
|
atomic_dec(&inode->i_count);
|
|
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, int mode)
|
|
{
|
|
struct super_block *sb;
|
|
struct inode *inode;
|
|
struct exofs_i_info *oi;
|
|
struct exofs_sb_info *sbi;
|
|
struct exofs_io_state *ios;
|
|
int ret;
|
|
|
|
sb = dir->i_sb;
|
|
inode = new_inode(sb);
|
|
if (!inode)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
oi = exofs_i(inode);
|
|
__oi_init(oi);
|
|
|
|
set_obj_2bcreated(oi);
|
|
|
|
sbi = sb->s_fs_info;
|
|
|
|
sb->s_dirt = 1;
|
|
inode->i_uid = current->cred->fsuid;
|
|
if (dir->i_mode & S_ISGID) {
|
|
inode->i_gid = dir->i_gid;
|
|
if (S_ISDIR(mode))
|
|
mode |= S_ISGID;
|
|
} else {
|
|
inode->i_gid = current->cred->fsgid;
|
|
}
|
|
inode->i_mode = mode;
|
|
|
|
inode->i_ino = sbi->s_nextid++;
|
|
inode->i_blkbits = EXOFS_BLKSHIFT;
|
|
inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
|
|
oi->i_commit_size = inode->i_size = 0;
|
|
spin_lock(&sbi->s_next_gen_lock);
|
|
inode->i_generation = sbi->s_next_generation++;
|
|
spin_unlock(&sbi->s_next_gen_lock);
|
|
insert_inode_hash(inode);
|
|
|
|
mark_inode_dirty(inode);
|
|
|
|
ret = exofs_get_io_state(sbi, &ios);
|
|
if (unlikely(ret)) {
|
|
EXOFS_ERR("exofs_new_inode: exofs_get_io_state failed\n");
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
ios->obj.id = exofs_oi_objno(oi);
|
|
exofs_make_credential(oi->i_cred, &ios->obj);
|
|
|
|
/* increment the refcount so that the inode will still be around when we
|
|
* reach the callback
|
|
*/
|
|
atomic_inc(&inode->i_count);
|
|
|
|
ios->done = create_done;
|
|
ios->private = inode;
|
|
ios->cred = oi->i_cred;
|
|
ret = exofs_sbi_create(ios);
|
|
if (ret) {
|
|
atomic_dec(&inode->i_count);
|
|
exofs_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 exofs_io_state *ios, void *p)
|
|
{
|
|
struct updatei_args *args = p;
|
|
|
|
exofs_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 exofs_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)
|
|
return -ENOMEM;
|
|
|
|
fcb = &args->fcb;
|
|
|
|
fcb->i_mode = cpu_to_le16(inode->i_mode);
|
|
fcb->i_uid = cpu_to_le32(inode->i_uid);
|
|
fcb->i_gid = cpu_to_le32(inode->i_gid);
|
|
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 = exofs_get_io_state(sbi, &ios);
|
|
if (unlikely(ret)) {
|
|
EXOFS_ERR("%s: exofs_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;
|
|
|
|
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");
|
|
}
|
|
|
|
if (!do_sync) {
|
|
args->sbi = sbi;
|
|
ios->done = updatei_done;
|
|
ios->private = args;
|
|
}
|
|
|
|
ret = exofs_oi_write(oi, ios);
|
|
if (!do_sync && !ret) {
|
|
atomic_inc(&sbi->s_curr_pending);
|
|
goto out; /* deallocation in updatei_done */
|
|
}
|
|
|
|
exofs_put_io_state(ios);
|
|
free_args:
|
|
kfree(args);
|
|
out:
|
|
EXOFS_DBGMSG("ret=>%d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
int exofs_write_inode(struct inode *inode, int wait)
|
|
{
|
|
return exofs_update_inode(inode, wait);
|
|
}
|
|
|
|
/*
|
|
* Callback function from exofs_delete_inode() - don't have much cleaning up to
|
|
* do.
|
|
*/
|
|
static void delete_done(struct exofs_io_state *ios, void *p)
|
|
{
|
|
struct exofs_sb_info *sbi = p;
|
|
|
|
exofs_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_delete_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 exofs_io_state *ios;
|
|
int ret;
|
|
|
|
truncate_inode_pages(&inode->i_data, 0);
|
|
|
|
if (is_bad_inode(inode))
|
|
goto no_delete;
|
|
|
|
mark_inode_dirty(inode);
|
|
exofs_update_inode(inode, inode_needs_sync(inode));
|
|
|
|
inode->i_size = 0;
|
|
if (inode->i_blocks)
|
|
exofs_truncate(inode);
|
|
|
|
clear_inode(inode);
|
|
|
|
ret = exofs_get_io_state(sbi, &ios);
|
|
if (unlikely(ret)) {
|
|
EXOFS_ERR("%s: exofs_get_io_state failed\n", __func__);
|
|
return;
|
|
}
|
|
|
|
/* if we are deleting an obj that hasn't been created yet, wait */
|
|
if (!obj_created(oi)) {
|
|
BUG_ON(!obj_2bcreated(oi));
|
|
wait_event(oi->i_wq, obj_created(oi));
|
|
}
|
|
|
|
ios->obj.id = exofs_oi_objno(oi);
|
|
ios->done = delete_done;
|
|
ios->private = sbi;
|
|
ios->cred = oi->i_cred;
|
|
ret = exofs_sbi_remove(ios);
|
|
if (ret) {
|
|
EXOFS_ERR("%s: exofs_sbi_remove failed\n", __func__);
|
|
exofs_put_io_state(ios);
|
|
return;
|
|
}
|
|
atomic_inc(&sbi->s_curr_pending);
|
|
|
|
return;
|
|
|
|
no_delete:
|
|
clear_inode(inode);
|
|
}
|