f8409abdc5
collapse_range and zero_range fallocate functions. In addition, improve the scalability of adding and remove inodes from the orphan list. -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.22 (GNU/Linux) iQIcBAABCAAGBQJTk9x7AAoJENNvdpvBGATwQQ4QAN85xkNWWiq0feLGZjUVTre/ JUgRQWXZYVogAQckQoTDXqJt1qKYxO45A8oIoUMI4uzgcFJm7iJIZJAv3Hjd2ftz 48RVwjWHblmBz6e+CdmETpzJUaJr3KXbnk3EDQzagWg3Q64dBU/yT0c4foBO8wfX FI1MNin70r5NGQv6Mp4xNUfMoU6liCrsMO2RWkyxY2rcmxy6tkpNO/NBAPwhmn0e vwKHvnnqKM08Frrt6Lz3MpXGAJ+rhTSvmL+qSRXQn9BcbphdGa4jy+i3HbviRX4N z77UZMgMbfK1V3YHm8KzmmbIHrmIARXUlCM7jp4HPSnb4qhyERrhVmGCJZ8civ6Q 3Cm9WwA93PQDfRX6Kid3K1tR/ql+ryac55o9SM990osrWp4C0IH+P/CdlSN0GspN 3pJTLHUVVcxF6gSnOD+q/JzM8Iudl87Rxb17wA+6eg3AJRaPoQSPJoqtwZ89ZwOz RiZGuugFp7gDOxqo32lJ53fivO/e1zxXxu0dVHHjOnHBVWX063hlcibTg8kvFWg1 7bBvUkvgT5jR+UuDX81wPZ+c0kkmfk4gxT5sHg6RlMKeCYi3uuLmAYgla3AM4j9G GeNNdVTmilH7wMgYB2wxd0C5HofgKgM5YFLZWc0FVSXMeFs5ST2kbLMXAZqzrKPa szHFEJHIGZByXfkP/jix =C1ZV -----END PGP SIGNATURE----- Merge tag 'ext4_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4 Pull ext4 updates from Ted Ts'o: "Clean ups and miscellaneous bug fixes, in particular for the new collapse_range and zero_range fallocate functions. In addition, improve the scalability of adding and remove inodes from the orphan list" * tag 'ext4_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4: (25 commits) ext4: handle symlink properly with inline_data ext4: fix wrong assert in ext4_mb_normalize_request() ext4: fix zeroing of page during writeback ext4: remove unused local variable "stored" from ext4_readdir(...) ext4: fix ZERO_RANGE test failure in data journalling ext4: reduce contention on s_orphan_lock ext4: use sbi in ext4_orphan_{add|del}() ext4: use EXT_MAX_BLOCKS in ext4_es_can_be_merged() ext4: add missing BUFFER_TRACE before ext4_journal_get_write_access ext4: remove unnecessary double parentheses ext4: do not destroy ext4_groupinfo_caches if ext4_mb_init() fails ext4: make local functions static ext4: fix block bitmap validation when bigalloc, ^flex_bg ext4: fix block bitmap initialization under sparse_super2 ext4: find the group descriptors on a 1k-block bigalloc,meta_bg filesystem ext4: avoid unneeded lookup when xattr name is invalid ext4: fix data integrity sync in ordered mode ext4: remove obsoleted check ext4: add a new spinlock i_raw_lock to protect the ext4's raw inode ext4: fix locking for O_APPEND writes ...
498 lines
13 KiB
C
498 lines
13 KiB
C
/*
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* linux/fs/ext4/page-io.c
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*
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* This contains the new page_io functions for ext4
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*
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* Written by Theodore Ts'o, 2010.
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*/
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#include <linux/fs.h>
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#include <linux/time.h>
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#include <linux/jbd2.h>
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#include <linux/highuid.h>
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#include <linux/pagemap.h>
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#include <linux/quotaops.h>
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#include <linux/string.h>
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#include <linux/buffer_head.h>
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#include <linux/writeback.h>
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#include <linux/pagevec.h>
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#include <linux/mpage.h>
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#include <linux/namei.h>
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#include <linux/aio.h>
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#include <linux/uio.h>
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#include <linux/bio.h>
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#include <linux/workqueue.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/mm.h>
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#include <linux/ratelimit.h>
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#include "ext4_jbd2.h"
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#include "xattr.h"
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#include "acl.h"
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static struct kmem_cache *io_end_cachep;
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int __init ext4_init_pageio(void)
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{
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io_end_cachep = KMEM_CACHE(ext4_io_end, SLAB_RECLAIM_ACCOUNT);
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if (io_end_cachep == NULL)
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return -ENOMEM;
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return 0;
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}
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void ext4_exit_pageio(void)
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{
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kmem_cache_destroy(io_end_cachep);
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}
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/*
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* Print an buffer I/O error compatible with the fs/buffer.c. This
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* provides compatibility with dmesg scrapers that look for a specific
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* buffer I/O error message. We really need a unified error reporting
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* structure to userspace ala Digital Unix's uerf system, but it's
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* probably not going to happen in my lifetime, due to LKML politics...
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*/
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static void buffer_io_error(struct buffer_head *bh)
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{
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char b[BDEVNAME_SIZE];
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printk_ratelimited(KERN_ERR "Buffer I/O error on device %s, logical block %llu\n",
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bdevname(bh->b_bdev, b),
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(unsigned long long)bh->b_blocknr);
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}
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static void ext4_finish_bio(struct bio *bio)
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{
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int i;
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int error = !test_bit(BIO_UPTODATE, &bio->bi_flags);
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struct bio_vec *bvec;
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bio_for_each_segment_all(bvec, bio, i) {
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struct page *page = bvec->bv_page;
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struct buffer_head *bh, *head;
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unsigned bio_start = bvec->bv_offset;
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unsigned bio_end = bio_start + bvec->bv_len;
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unsigned under_io = 0;
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unsigned long flags;
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if (!page)
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continue;
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if (error) {
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SetPageError(page);
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set_bit(AS_EIO, &page->mapping->flags);
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}
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bh = head = page_buffers(page);
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/*
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* We check all buffers in the page under BH_Uptodate_Lock
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* to avoid races with other end io clearing async_write flags
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*/
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local_irq_save(flags);
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bit_spin_lock(BH_Uptodate_Lock, &head->b_state);
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do {
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if (bh_offset(bh) < bio_start ||
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bh_offset(bh) + bh->b_size > bio_end) {
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if (buffer_async_write(bh))
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under_io++;
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continue;
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}
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clear_buffer_async_write(bh);
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if (error)
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buffer_io_error(bh);
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} while ((bh = bh->b_this_page) != head);
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bit_spin_unlock(BH_Uptodate_Lock, &head->b_state);
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local_irq_restore(flags);
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if (!under_io)
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end_page_writeback(page);
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}
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}
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static void ext4_release_io_end(ext4_io_end_t *io_end)
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{
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struct bio *bio, *next_bio;
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BUG_ON(!list_empty(&io_end->list));
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BUG_ON(io_end->flag & EXT4_IO_END_UNWRITTEN);
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WARN_ON(io_end->handle);
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if (atomic_dec_and_test(&EXT4_I(io_end->inode)->i_ioend_count))
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wake_up_all(ext4_ioend_wq(io_end->inode));
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for (bio = io_end->bio; bio; bio = next_bio) {
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next_bio = bio->bi_private;
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ext4_finish_bio(bio);
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bio_put(bio);
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}
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kmem_cache_free(io_end_cachep, io_end);
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}
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static void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end)
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{
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struct inode *inode = io_end->inode;
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io_end->flag &= ~EXT4_IO_END_UNWRITTEN;
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/* Wake up anyone waiting on unwritten extent conversion */
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if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten))
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wake_up_all(ext4_ioend_wq(inode));
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}
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/*
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* Check a range of space and convert unwritten extents to written. Note that
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* we are protected from truncate touching same part of extent tree by the
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* fact that truncate code waits for all DIO to finish (thus exclusion from
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* direct IO is achieved) and also waits for PageWriteback bits. Thus we
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* cannot get to ext4_ext_truncate() before all IOs overlapping that range are
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* completed (happens from ext4_free_ioend()).
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*/
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static int ext4_end_io(ext4_io_end_t *io)
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{
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struct inode *inode = io->inode;
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loff_t offset = io->offset;
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ssize_t size = io->size;
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handle_t *handle = io->handle;
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int ret = 0;
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ext4_debug("ext4_end_io_nolock: io 0x%p from inode %lu,list->next 0x%p,"
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"list->prev 0x%p\n",
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io, inode->i_ino, io->list.next, io->list.prev);
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io->handle = NULL; /* Following call will use up the handle */
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ret = ext4_convert_unwritten_extents(handle, inode, offset, size);
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if (ret < 0) {
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ext4_msg(inode->i_sb, KERN_EMERG,
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"failed to convert unwritten extents to written "
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"extents -- potential data loss! "
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"(inode %lu, offset %llu, size %zd, error %d)",
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inode->i_ino, offset, size, ret);
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}
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ext4_clear_io_unwritten_flag(io);
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ext4_release_io_end(io);
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return ret;
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}
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static void dump_completed_IO(struct inode *inode, struct list_head *head)
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{
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#ifdef EXT4FS_DEBUG
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struct list_head *cur, *before, *after;
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ext4_io_end_t *io, *io0, *io1;
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if (list_empty(head))
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return;
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ext4_debug("Dump inode %lu completed io list\n", inode->i_ino);
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list_for_each_entry(io, head, list) {
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cur = &io->list;
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before = cur->prev;
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io0 = container_of(before, ext4_io_end_t, list);
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after = cur->next;
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io1 = container_of(after, ext4_io_end_t, list);
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ext4_debug("io 0x%p from inode %lu,prev 0x%p,next 0x%p\n",
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io, inode->i_ino, io0, io1);
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}
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#endif
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}
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/* Add the io_end to per-inode completed end_io list. */
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static void ext4_add_complete_io(ext4_io_end_t *io_end)
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{
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struct ext4_inode_info *ei = EXT4_I(io_end->inode);
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struct ext4_sb_info *sbi = EXT4_SB(io_end->inode->i_sb);
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struct workqueue_struct *wq;
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unsigned long flags;
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/* Only reserved conversions from writeback should enter here */
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WARN_ON(!(io_end->flag & EXT4_IO_END_UNWRITTEN));
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WARN_ON(!io_end->handle && sbi->s_journal);
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spin_lock_irqsave(&ei->i_completed_io_lock, flags);
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wq = sbi->rsv_conversion_wq;
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if (list_empty(&ei->i_rsv_conversion_list))
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queue_work(wq, &ei->i_rsv_conversion_work);
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list_add_tail(&io_end->list, &ei->i_rsv_conversion_list);
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spin_unlock_irqrestore(&ei->i_completed_io_lock, flags);
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}
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static int ext4_do_flush_completed_IO(struct inode *inode,
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struct list_head *head)
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{
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ext4_io_end_t *io;
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struct list_head unwritten;
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unsigned long flags;
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struct ext4_inode_info *ei = EXT4_I(inode);
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int err, ret = 0;
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spin_lock_irqsave(&ei->i_completed_io_lock, flags);
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dump_completed_IO(inode, head);
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list_replace_init(head, &unwritten);
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spin_unlock_irqrestore(&ei->i_completed_io_lock, flags);
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while (!list_empty(&unwritten)) {
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io = list_entry(unwritten.next, ext4_io_end_t, list);
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BUG_ON(!(io->flag & EXT4_IO_END_UNWRITTEN));
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list_del_init(&io->list);
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err = ext4_end_io(io);
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if (unlikely(!ret && err))
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ret = err;
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}
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return ret;
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}
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/*
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* work on completed IO, to convert unwritten extents to extents
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*/
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void ext4_end_io_rsv_work(struct work_struct *work)
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{
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struct ext4_inode_info *ei = container_of(work, struct ext4_inode_info,
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i_rsv_conversion_work);
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ext4_do_flush_completed_IO(&ei->vfs_inode, &ei->i_rsv_conversion_list);
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}
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ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags)
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{
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ext4_io_end_t *io = kmem_cache_zalloc(io_end_cachep, flags);
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if (io) {
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atomic_inc(&EXT4_I(inode)->i_ioend_count);
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io->inode = inode;
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INIT_LIST_HEAD(&io->list);
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atomic_set(&io->count, 1);
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}
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return io;
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}
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void ext4_put_io_end_defer(ext4_io_end_t *io_end)
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{
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if (atomic_dec_and_test(&io_end->count)) {
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if (!(io_end->flag & EXT4_IO_END_UNWRITTEN) || !io_end->size) {
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ext4_release_io_end(io_end);
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return;
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}
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ext4_add_complete_io(io_end);
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}
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}
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int ext4_put_io_end(ext4_io_end_t *io_end)
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{
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int err = 0;
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if (atomic_dec_and_test(&io_end->count)) {
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if (io_end->flag & EXT4_IO_END_UNWRITTEN) {
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err = ext4_convert_unwritten_extents(io_end->handle,
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io_end->inode, io_end->offset,
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io_end->size);
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io_end->handle = NULL;
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ext4_clear_io_unwritten_flag(io_end);
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}
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ext4_release_io_end(io_end);
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}
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return err;
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}
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ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end)
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{
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atomic_inc(&io_end->count);
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return io_end;
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}
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/* BIO completion function for page writeback */
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static void ext4_end_bio(struct bio *bio, int error)
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{
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ext4_io_end_t *io_end = bio->bi_private;
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sector_t bi_sector = bio->bi_iter.bi_sector;
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BUG_ON(!io_end);
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bio->bi_end_io = NULL;
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if (test_bit(BIO_UPTODATE, &bio->bi_flags))
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error = 0;
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if (error) {
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struct inode *inode = io_end->inode;
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ext4_warning(inode->i_sb, "I/O error %d writing to inode %lu "
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"(offset %llu size %ld starting block %llu)",
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error, inode->i_ino,
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(unsigned long long) io_end->offset,
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(long) io_end->size,
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(unsigned long long)
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bi_sector >> (inode->i_blkbits - 9));
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mapping_set_error(inode->i_mapping, error);
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}
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if (io_end->flag & EXT4_IO_END_UNWRITTEN) {
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/*
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* Link bio into list hanging from io_end. We have to do it
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* atomically as bio completions can be racing against each
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* other.
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*/
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bio->bi_private = xchg(&io_end->bio, bio);
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ext4_put_io_end_defer(io_end);
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} else {
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/*
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* Drop io_end reference early. Inode can get freed once
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* we finish the bio.
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*/
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ext4_put_io_end_defer(io_end);
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ext4_finish_bio(bio);
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bio_put(bio);
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}
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}
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void ext4_io_submit(struct ext4_io_submit *io)
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{
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struct bio *bio = io->io_bio;
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if (bio) {
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bio_get(io->io_bio);
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submit_bio(io->io_op, io->io_bio);
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BUG_ON(bio_flagged(io->io_bio, BIO_EOPNOTSUPP));
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bio_put(io->io_bio);
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}
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io->io_bio = NULL;
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}
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void ext4_io_submit_init(struct ext4_io_submit *io,
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struct writeback_control *wbc)
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{
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io->io_op = (wbc->sync_mode == WB_SYNC_ALL ? WRITE_SYNC : WRITE);
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io->io_bio = NULL;
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io->io_end = NULL;
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}
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static int io_submit_init_bio(struct ext4_io_submit *io,
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struct buffer_head *bh)
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{
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int nvecs = bio_get_nr_vecs(bh->b_bdev);
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struct bio *bio;
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bio = bio_alloc(GFP_NOIO, min(nvecs, BIO_MAX_PAGES));
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if (!bio)
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return -ENOMEM;
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bio->bi_iter.bi_sector = bh->b_blocknr * (bh->b_size >> 9);
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bio->bi_bdev = bh->b_bdev;
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bio->bi_end_io = ext4_end_bio;
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bio->bi_private = ext4_get_io_end(io->io_end);
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io->io_bio = bio;
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io->io_next_block = bh->b_blocknr;
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return 0;
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}
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static int io_submit_add_bh(struct ext4_io_submit *io,
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struct inode *inode,
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struct buffer_head *bh)
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{
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int ret;
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if (io->io_bio && bh->b_blocknr != io->io_next_block) {
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submit_and_retry:
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ext4_io_submit(io);
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}
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if (io->io_bio == NULL) {
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ret = io_submit_init_bio(io, bh);
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if (ret)
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return ret;
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}
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ret = bio_add_page(io->io_bio, bh->b_page, bh->b_size, bh_offset(bh));
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if (ret != bh->b_size)
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goto submit_and_retry;
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io->io_next_block++;
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return 0;
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}
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int ext4_bio_write_page(struct ext4_io_submit *io,
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struct page *page,
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int len,
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struct writeback_control *wbc,
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bool keep_towrite)
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{
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struct inode *inode = page->mapping->host;
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unsigned block_start, blocksize;
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struct buffer_head *bh, *head;
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int ret = 0;
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int nr_submitted = 0;
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blocksize = 1 << inode->i_blkbits;
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BUG_ON(!PageLocked(page));
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BUG_ON(PageWriteback(page));
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if (keep_towrite)
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set_page_writeback_keepwrite(page);
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else
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set_page_writeback(page);
|
|
ClearPageError(page);
|
|
|
|
/*
|
|
* Comments copied from block_write_full_page:
|
|
*
|
|
* The page straddles i_size. It must be zeroed out on each and every
|
|
* writepage invocation because it may be mmapped. "A file is mapped
|
|
* in multiples of the page size. For a file that is not a multiple of
|
|
* the page size, the remaining memory is zeroed when mapped, and
|
|
* writes to that region are not written out to the file."
|
|
*/
|
|
if (len < PAGE_CACHE_SIZE)
|
|
zero_user_segment(page, len, PAGE_CACHE_SIZE);
|
|
/*
|
|
* In the first loop we prepare and mark buffers to submit. We have to
|
|
* mark all buffers in the page before submitting so that
|
|
* end_page_writeback() cannot be called from ext4_bio_end_io() when IO
|
|
* on the first buffer finishes and we are still working on submitting
|
|
* the second buffer.
|
|
*/
|
|
bh = head = page_buffers(page);
|
|
do {
|
|
block_start = bh_offset(bh);
|
|
if (block_start >= len) {
|
|
clear_buffer_dirty(bh);
|
|
set_buffer_uptodate(bh);
|
|
continue;
|
|
}
|
|
if (!buffer_dirty(bh) || buffer_delay(bh) ||
|
|
!buffer_mapped(bh) || buffer_unwritten(bh)) {
|
|
/* A hole? We can safely clear the dirty bit */
|
|
if (!buffer_mapped(bh))
|
|
clear_buffer_dirty(bh);
|
|
if (io->io_bio)
|
|
ext4_io_submit(io);
|
|
continue;
|
|
}
|
|
if (buffer_new(bh)) {
|
|
clear_buffer_new(bh);
|
|
unmap_underlying_metadata(bh->b_bdev, bh->b_blocknr);
|
|
}
|
|
set_buffer_async_write(bh);
|
|
} while ((bh = bh->b_this_page) != head);
|
|
|
|
/* Now submit buffers to write */
|
|
bh = head = page_buffers(page);
|
|
do {
|
|
if (!buffer_async_write(bh))
|
|
continue;
|
|
ret = io_submit_add_bh(io, inode, bh);
|
|
if (ret) {
|
|
/*
|
|
* We only get here on ENOMEM. Not much else
|
|
* we can do but mark the page as dirty, and
|
|
* better luck next time.
|
|
*/
|
|
redirty_page_for_writepage(wbc, page);
|
|
break;
|
|
}
|
|
nr_submitted++;
|
|
clear_buffer_dirty(bh);
|
|
} while ((bh = bh->b_this_page) != head);
|
|
|
|
/* Error stopped previous loop? Clean up buffers... */
|
|
if (ret) {
|
|
do {
|
|
clear_buffer_async_write(bh);
|
|
bh = bh->b_this_page;
|
|
} while (bh != head);
|
|
}
|
|
unlock_page(page);
|
|
/* Nothing submitted - we have to end page writeback */
|
|
if (!nr_submitted)
|
|
end_page_writeback(page);
|
|
return ret;
|
|
}
|