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e3c3155bc9
In the zoned storage model, the sectors within a zone are typically all writeable. With the introduction of the Zoned Namespace (ZNS) Command Set in the NVM Express organization, the model was extended to have a specific writeable capacity. This zone capacity can be less than the overall zone size for a NVMe ZNS device or null_blk in zoned-mode. For other ZBC/ZAC devices the zone capacity is always equal to the zone size. Use the zone capacity field instead from blk_zone for determining the maximum inode size and inode blocks in zonefs. Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
1532 lines
39 KiB
C
1532 lines
39 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Simple file system for zoned block devices exposing zones as files.
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*
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* Copyright (C) 2019 Western Digital Corporation or its affiliates.
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*/
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#include <linux/module.h>
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#include <linux/fs.h>
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#include <linux/magic.h>
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#include <linux/iomap.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/blkdev.h>
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#include <linux/statfs.h>
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#include <linux/writeback.h>
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#include <linux/quotaops.h>
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#include <linux/seq_file.h>
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#include <linux/parser.h>
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#include <linux/uio.h>
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#include <linux/mman.h>
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#include <linux/sched/mm.h>
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#include <linux/crc32.h>
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#include <linux/task_io_accounting_ops.h>
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#include "zonefs.h"
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static int zonefs_iomap_begin(struct inode *inode, loff_t offset, loff_t length,
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unsigned int flags, struct iomap *iomap,
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struct iomap *srcmap)
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{
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struct zonefs_inode_info *zi = ZONEFS_I(inode);
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struct super_block *sb = inode->i_sb;
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loff_t isize;
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/* All I/Os should always be within the file maximum size */
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if (WARN_ON_ONCE(offset + length > zi->i_max_size))
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return -EIO;
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/*
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* Sequential zones can only accept direct writes. This is already
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* checked when writes are issued, so warn if we see a page writeback
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* operation.
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*/
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if (WARN_ON_ONCE(zi->i_ztype == ZONEFS_ZTYPE_SEQ &&
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(flags & IOMAP_WRITE) && !(flags & IOMAP_DIRECT)))
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return -EIO;
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/*
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* For conventional zones, all blocks are always mapped. For sequential
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* zones, all blocks after always mapped below the inode size (zone
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* write pointer) and unwriten beyond.
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*/
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mutex_lock(&zi->i_truncate_mutex);
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isize = i_size_read(inode);
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if (offset >= isize)
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iomap->type = IOMAP_UNWRITTEN;
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else
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iomap->type = IOMAP_MAPPED;
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if (flags & IOMAP_WRITE)
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length = zi->i_max_size - offset;
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else
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length = min(length, isize - offset);
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mutex_unlock(&zi->i_truncate_mutex);
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iomap->offset = ALIGN_DOWN(offset, sb->s_blocksize);
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iomap->length = ALIGN(offset + length, sb->s_blocksize) - iomap->offset;
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iomap->bdev = inode->i_sb->s_bdev;
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iomap->addr = (zi->i_zsector << SECTOR_SHIFT) + iomap->offset;
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return 0;
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}
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static const struct iomap_ops zonefs_iomap_ops = {
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.iomap_begin = zonefs_iomap_begin,
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};
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static int zonefs_readpage(struct file *unused, struct page *page)
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{
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return iomap_readpage(page, &zonefs_iomap_ops);
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}
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static void zonefs_readahead(struct readahead_control *rac)
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{
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iomap_readahead(rac, &zonefs_iomap_ops);
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}
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/*
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* Map blocks for page writeback. This is used only on conventional zone files,
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* which implies that the page range can only be within the fixed inode size.
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*/
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static int zonefs_map_blocks(struct iomap_writepage_ctx *wpc,
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struct inode *inode, loff_t offset)
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{
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struct zonefs_inode_info *zi = ZONEFS_I(inode);
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if (WARN_ON_ONCE(zi->i_ztype != ZONEFS_ZTYPE_CNV))
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return -EIO;
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if (WARN_ON_ONCE(offset >= i_size_read(inode)))
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return -EIO;
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/* If the mapping is already OK, nothing needs to be done */
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if (offset >= wpc->iomap.offset &&
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offset < wpc->iomap.offset + wpc->iomap.length)
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return 0;
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return zonefs_iomap_begin(inode, offset, zi->i_max_size - offset,
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IOMAP_WRITE, &wpc->iomap, NULL);
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}
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static const struct iomap_writeback_ops zonefs_writeback_ops = {
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.map_blocks = zonefs_map_blocks,
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};
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static int zonefs_writepage(struct page *page, struct writeback_control *wbc)
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{
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struct iomap_writepage_ctx wpc = { };
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return iomap_writepage(page, wbc, &wpc, &zonefs_writeback_ops);
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}
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static int zonefs_writepages(struct address_space *mapping,
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struct writeback_control *wbc)
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{
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struct iomap_writepage_ctx wpc = { };
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return iomap_writepages(mapping, wbc, &wpc, &zonefs_writeback_ops);
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}
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static const struct address_space_operations zonefs_file_aops = {
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.readpage = zonefs_readpage,
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.readahead = zonefs_readahead,
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.writepage = zonefs_writepage,
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.writepages = zonefs_writepages,
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.set_page_dirty = iomap_set_page_dirty,
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.releasepage = iomap_releasepage,
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.invalidatepage = iomap_invalidatepage,
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.migratepage = iomap_migrate_page,
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.is_partially_uptodate = iomap_is_partially_uptodate,
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.error_remove_page = generic_error_remove_page,
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.direct_IO = noop_direct_IO,
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};
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static void zonefs_update_stats(struct inode *inode, loff_t new_isize)
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{
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struct super_block *sb = inode->i_sb;
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struct zonefs_sb_info *sbi = ZONEFS_SB(sb);
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loff_t old_isize = i_size_read(inode);
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loff_t nr_blocks;
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if (new_isize == old_isize)
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return;
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spin_lock(&sbi->s_lock);
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/*
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* This may be called for an update after an IO error.
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* So beware of the values seen.
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*/
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if (new_isize < old_isize) {
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nr_blocks = (old_isize - new_isize) >> sb->s_blocksize_bits;
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if (sbi->s_used_blocks > nr_blocks)
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sbi->s_used_blocks -= nr_blocks;
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else
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sbi->s_used_blocks = 0;
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} else {
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sbi->s_used_blocks +=
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(new_isize - old_isize) >> sb->s_blocksize_bits;
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if (sbi->s_used_blocks > sbi->s_blocks)
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sbi->s_used_blocks = sbi->s_blocks;
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}
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spin_unlock(&sbi->s_lock);
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}
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/*
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* Check a zone condition and adjust its file inode access permissions for
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* offline and readonly zones. Return the inode size corresponding to the
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* amount of readable data in the zone.
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*/
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static loff_t zonefs_check_zone_condition(struct inode *inode,
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struct blk_zone *zone, bool warn,
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bool mount)
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{
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struct zonefs_inode_info *zi = ZONEFS_I(inode);
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switch (zone->cond) {
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case BLK_ZONE_COND_OFFLINE:
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/*
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* Dead zone: make the inode immutable, disable all accesses
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* and set the file size to 0 (zone wp set to zone start).
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*/
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if (warn)
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zonefs_warn(inode->i_sb, "inode %lu: offline zone\n",
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inode->i_ino);
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inode->i_flags |= S_IMMUTABLE;
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inode->i_mode &= ~0777;
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zone->wp = zone->start;
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return 0;
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case BLK_ZONE_COND_READONLY:
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/*
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* The write pointer of read-only zones is invalid. If such a
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* zone is found during mount, the file size cannot be retrieved
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* so we treat the zone as offline (mount == true case).
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* Otherwise, keep the file size as it was when last updated
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* so that the user can recover data. In both cases, writes are
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* always disabled for the zone.
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*/
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if (warn)
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zonefs_warn(inode->i_sb, "inode %lu: read-only zone\n",
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inode->i_ino);
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inode->i_flags |= S_IMMUTABLE;
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if (mount) {
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zone->cond = BLK_ZONE_COND_OFFLINE;
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inode->i_mode &= ~0777;
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zone->wp = zone->start;
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return 0;
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}
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inode->i_mode &= ~0222;
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return i_size_read(inode);
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default:
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if (zi->i_ztype == ZONEFS_ZTYPE_CNV)
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return zi->i_max_size;
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return (zone->wp - zone->start) << SECTOR_SHIFT;
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}
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}
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struct zonefs_ioerr_data {
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struct inode *inode;
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bool write;
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};
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static int zonefs_io_error_cb(struct blk_zone *zone, unsigned int idx,
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void *data)
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{
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struct zonefs_ioerr_data *err = data;
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struct inode *inode = err->inode;
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struct zonefs_inode_info *zi = ZONEFS_I(inode);
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struct super_block *sb = inode->i_sb;
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struct zonefs_sb_info *sbi = ZONEFS_SB(sb);
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loff_t isize, data_size;
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/*
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* Check the zone condition: if the zone is not "bad" (offline or
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* read-only), read errors are simply signaled to the IO issuer as long
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* as there is no inconsistency between the inode size and the amount of
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* data writen in the zone (data_size).
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*/
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data_size = zonefs_check_zone_condition(inode, zone, true, false);
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isize = i_size_read(inode);
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if (zone->cond != BLK_ZONE_COND_OFFLINE &&
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zone->cond != BLK_ZONE_COND_READONLY &&
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!err->write && isize == data_size)
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return 0;
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/*
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* At this point, we detected either a bad zone or an inconsistency
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* between the inode size and the amount of data written in the zone.
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* For the latter case, the cause may be a write IO error or an external
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* action on the device. Two error patterns exist:
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* 1) The inode size is lower than the amount of data in the zone:
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* a write operation partially failed and data was writen at the end
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* of the file. This can happen in the case of a large direct IO
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* needing several BIOs and/or write requests to be processed.
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* 2) The inode size is larger than the amount of data in the zone:
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* this can happen with a deferred write error with the use of the
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* device side write cache after getting successful write IO
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* completions. Other possibilities are (a) an external corruption,
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* e.g. an application reset the zone directly, or (b) the device
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* has a serious problem (e.g. firmware bug).
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*
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* In all cases, warn about inode size inconsistency and handle the
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* IO error according to the zone condition and to the mount options.
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*/
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if (zi->i_ztype == ZONEFS_ZTYPE_SEQ && isize != data_size)
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zonefs_warn(sb, "inode %lu: invalid size %lld (should be %lld)\n",
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inode->i_ino, isize, data_size);
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/*
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* First handle bad zones signaled by hardware. The mount options
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* errors=zone-ro and errors=zone-offline result in changing the
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* zone condition to read-only and offline respectively, as if the
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* condition was signaled by the hardware.
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*/
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if (zone->cond == BLK_ZONE_COND_OFFLINE ||
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sbi->s_mount_opts & ZONEFS_MNTOPT_ERRORS_ZOL) {
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zonefs_warn(sb, "inode %lu: read/write access disabled\n",
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inode->i_ino);
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if (zone->cond != BLK_ZONE_COND_OFFLINE) {
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zone->cond = BLK_ZONE_COND_OFFLINE;
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data_size = zonefs_check_zone_condition(inode, zone,
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false, false);
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}
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} else if (zone->cond == BLK_ZONE_COND_READONLY ||
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sbi->s_mount_opts & ZONEFS_MNTOPT_ERRORS_ZRO) {
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zonefs_warn(sb, "inode %lu: write access disabled\n",
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inode->i_ino);
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if (zone->cond != BLK_ZONE_COND_READONLY) {
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zone->cond = BLK_ZONE_COND_READONLY;
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data_size = zonefs_check_zone_condition(inode, zone,
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false, false);
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}
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}
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/*
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* If error=remount-ro was specified, any error result in remounting
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* the volume as read-only.
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*/
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if ((sbi->s_mount_opts & ZONEFS_MNTOPT_ERRORS_RO) && !sb_rdonly(sb)) {
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zonefs_warn(sb, "remounting filesystem read-only\n");
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sb->s_flags |= SB_RDONLY;
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}
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/*
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* Update block usage stats and the inode size to prevent access to
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* invalid data.
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*/
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zonefs_update_stats(inode, data_size);
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i_size_write(inode, data_size);
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zi->i_wpoffset = data_size;
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return 0;
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}
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/*
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* When an file IO error occurs, check the file zone to see if there is a change
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* in the zone condition (e.g. offline or read-only). For a failed write to a
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* sequential zone, the zone write pointer position must also be checked to
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* eventually correct the file size and zonefs inode write pointer offset
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* (which can be out of sync with the drive due to partial write failures).
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*/
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static void zonefs_io_error(struct inode *inode, bool write)
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{
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struct zonefs_inode_info *zi = ZONEFS_I(inode);
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struct super_block *sb = inode->i_sb;
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struct zonefs_sb_info *sbi = ZONEFS_SB(sb);
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unsigned int noio_flag;
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unsigned int nr_zones =
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zi->i_zone_size >> (sbi->s_zone_sectors_shift + SECTOR_SHIFT);
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struct zonefs_ioerr_data err = {
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.inode = inode,
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.write = write,
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};
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int ret;
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mutex_lock(&zi->i_truncate_mutex);
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/*
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* Memory allocations in blkdev_report_zones() can trigger a memory
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* reclaim which may in turn cause a recursion into zonefs as well as
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* struct request allocations for the same device. The former case may
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* end up in a deadlock on the inode truncate mutex, while the latter
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* may prevent IO forward progress. Executing the report zones under
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* the GFP_NOIO context avoids both problems.
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*/
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noio_flag = memalloc_noio_save();
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ret = blkdev_report_zones(sb->s_bdev, zi->i_zsector, nr_zones,
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zonefs_io_error_cb, &err);
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if (ret != nr_zones)
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zonefs_err(sb, "Get inode %lu zone information failed %d\n",
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inode->i_ino, ret);
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memalloc_noio_restore(noio_flag);
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mutex_unlock(&zi->i_truncate_mutex);
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}
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static int zonefs_file_truncate(struct inode *inode, loff_t isize)
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{
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struct zonefs_inode_info *zi = ZONEFS_I(inode);
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loff_t old_isize;
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enum req_opf op;
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int ret = 0;
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/*
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* Only sequential zone files can be truncated and truncation is allowed
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* only down to a 0 size, which is equivalent to a zone reset, and to
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* the maximum file size, which is equivalent to a zone finish.
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*/
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if (zi->i_ztype != ZONEFS_ZTYPE_SEQ)
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return -EPERM;
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if (!isize)
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op = REQ_OP_ZONE_RESET;
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else if (isize == zi->i_max_size)
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op = REQ_OP_ZONE_FINISH;
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else
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return -EPERM;
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inode_dio_wait(inode);
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/* Serialize against page faults */
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down_write(&zi->i_mmap_sem);
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/* Serialize against zonefs_iomap_begin() */
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mutex_lock(&zi->i_truncate_mutex);
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old_isize = i_size_read(inode);
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if (isize == old_isize)
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goto unlock;
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ret = blkdev_zone_mgmt(inode->i_sb->s_bdev, op, zi->i_zsector,
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zi->i_zone_size >> SECTOR_SHIFT, GFP_NOFS);
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if (ret) {
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zonefs_err(inode->i_sb,
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"Zone management operation at %llu failed %d",
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zi->i_zsector, ret);
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goto unlock;
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}
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zonefs_update_stats(inode, isize);
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truncate_setsize(inode, isize);
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zi->i_wpoffset = isize;
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unlock:
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mutex_unlock(&zi->i_truncate_mutex);
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up_write(&zi->i_mmap_sem);
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return ret;
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}
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static int zonefs_inode_setattr(struct dentry *dentry, struct iattr *iattr)
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{
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struct inode *inode = d_inode(dentry);
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int ret;
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if (unlikely(IS_IMMUTABLE(inode)))
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return -EPERM;
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ret = setattr_prepare(dentry, iattr);
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if (ret)
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return ret;
|
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|
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/*
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* Since files and directories cannot be created nor deleted, do not
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* allow setting any write attributes on the sub-directories grouping
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* files by zone type.
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*/
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if ((iattr->ia_valid & ATTR_MODE) && S_ISDIR(inode->i_mode) &&
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(iattr->ia_mode & 0222))
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return -EPERM;
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|
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if (((iattr->ia_valid & ATTR_UID) &&
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!uid_eq(iattr->ia_uid, inode->i_uid)) ||
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((iattr->ia_valid & ATTR_GID) &&
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!gid_eq(iattr->ia_gid, inode->i_gid))) {
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ret = dquot_transfer(inode, iattr);
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if (ret)
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return ret;
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}
|
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|
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if (iattr->ia_valid & ATTR_SIZE) {
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ret = zonefs_file_truncate(inode, iattr->ia_size);
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if (ret)
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return ret;
|
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}
|
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|
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setattr_copy(inode, iattr);
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|
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return 0;
|
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}
|
|
|
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static const struct inode_operations zonefs_file_inode_operations = {
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.setattr = zonefs_inode_setattr,
|
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};
|
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|
|
static int zonefs_file_fsync(struct file *file, loff_t start, loff_t end,
|
|
int datasync)
|
|
{
|
|
struct inode *inode = file_inode(file);
|
|
int ret = 0;
|
|
|
|
if (unlikely(IS_IMMUTABLE(inode)))
|
|
return -EPERM;
|
|
|
|
/*
|
|
* Since only direct writes are allowed in sequential files, page cache
|
|
* flush is needed only for conventional zone files.
|
|
*/
|
|
if (ZONEFS_I(inode)->i_ztype == ZONEFS_ZTYPE_CNV)
|
|
ret = file_write_and_wait_range(file, start, end);
|
|
if (!ret)
|
|
ret = blkdev_issue_flush(inode->i_sb->s_bdev, GFP_KERNEL);
|
|
|
|
if (ret)
|
|
zonefs_io_error(inode, true);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static vm_fault_t zonefs_filemap_fault(struct vm_fault *vmf)
|
|
{
|
|
struct zonefs_inode_info *zi = ZONEFS_I(file_inode(vmf->vma->vm_file));
|
|
vm_fault_t ret;
|
|
|
|
down_read(&zi->i_mmap_sem);
|
|
ret = filemap_fault(vmf);
|
|
up_read(&zi->i_mmap_sem);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static vm_fault_t zonefs_filemap_page_mkwrite(struct vm_fault *vmf)
|
|
{
|
|
struct inode *inode = file_inode(vmf->vma->vm_file);
|
|
struct zonefs_inode_info *zi = ZONEFS_I(inode);
|
|
vm_fault_t ret;
|
|
|
|
if (unlikely(IS_IMMUTABLE(inode)))
|
|
return VM_FAULT_SIGBUS;
|
|
|
|
/*
|
|
* Sanity check: only conventional zone files can have shared
|
|
* writeable mappings.
|
|
*/
|
|
if (WARN_ON_ONCE(zi->i_ztype != ZONEFS_ZTYPE_CNV))
|
|
return VM_FAULT_NOPAGE;
|
|
|
|
sb_start_pagefault(inode->i_sb);
|
|
file_update_time(vmf->vma->vm_file);
|
|
|
|
/* Serialize against truncates */
|
|
down_read(&zi->i_mmap_sem);
|
|
ret = iomap_page_mkwrite(vmf, &zonefs_iomap_ops);
|
|
up_read(&zi->i_mmap_sem);
|
|
|
|
sb_end_pagefault(inode->i_sb);
|
|
return ret;
|
|
}
|
|
|
|
static const struct vm_operations_struct zonefs_file_vm_ops = {
|
|
.fault = zonefs_filemap_fault,
|
|
.map_pages = filemap_map_pages,
|
|
.page_mkwrite = zonefs_filemap_page_mkwrite,
|
|
};
|
|
|
|
static int zonefs_file_mmap(struct file *file, struct vm_area_struct *vma)
|
|
{
|
|
/*
|
|
* Conventional zones accept random writes, so their files can support
|
|
* shared writable mappings. For sequential zone files, only read
|
|
* mappings are possible since there are no guarantees for write
|
|
* ordering between msync() and page cache writeback.
|
|
*/
|
|
if (ZONEFS_I(file_inode(file))->i_ztype == ZONEFS_ZTYPE_SEQ &&
|
|
(vma->vm_flags & VM_SHARED) && (vma->vm_flags & VM_MAYWRITE))
|
|
return -EINVAL;
|
|
|
|
file_accessed(file);
|
|
vma->vm_ops = &zonefs_file_vm_ops;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static loff_t zonefs_file_llseek(struct file *file, loff_t offset, int whence)
|
|
{
|
|
loff_t isize = i_size_read(file_inode(file));
|
|
|
|
/*
|
|
* Seeks are limited to below the zone size for conventional zones
|
|
* and below the zone write pointer for sequential zones. In both
|
|
* cases, this limit is the inode size.
|
|
*/
|
|
return generic_file_llseek_size(file, offset, whence, isize, isize);
|
|
}
|
|
|
|
static int zonefs_file_write_dio_end_io(struct kiocb *iocb, ssize_t size,
|
|
int error, unsigned int flags)
|
|
{
|
|
struct inode *inode = file_inode(iocb->ki_filp);
|
|
struct zonefs_inode_info *zi = ZONEFS_I(inode);
|
|
|
|
if (error) {
|
|
zonefs_io_error(inode, true);
|
|
return error;
|
|
}
|
|
|
|
if (size && zi->i_ztype != ZONEFS_ZTYPE_CNV) {
|
|
/*
|
|
* Note that we may be seeing completions out of order,
|
|
* but that is not a problem since a write completed
|
|
* successfully necessarily means that all preceding writes
|
|
* were also successful. So we can safely increase the inode
|
|
* size to the write end location.
|
|
*/
|
|
mutex_lock(&zi->i_truncate_mutex);
|
|
if (i_size_read(inode) < iocb->ki_pos + size) {
|
|
zonefs_update_stats(inode, iocb->ki_pos + size);
|
|
i_size_write(inode, iocb->ki_pos + size);
|
|
}
|
|
mutex_unlock(&zi->i_truncate_mutex);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct iomap_dio_ops zonefs_write_dio_ops = {
|
|
.end_io = zonefs_file_write_dio_end_io,
|
|
};
|
|
|
|
static ssize_t zonefs_file_dio_append(struct kiocb *iocb, struct iov_iter *from)
|
|
{
|
|
struct inode *inode = file_inode(iocb->ki_filp);
|
|
struct zonefs_inode_info *zi = ZONEFS_I(inode);
|
|
struct block_device *bdev = inode->i_sb->s_bdev;
|
|
unsigned int max;
|
|
struct bio *bio;
|
|
ssize_t size;
|
|
int nr_pages;
|
|
ssize_t ret;
|
|
|
|
max = queue_max_zone_append_sectors(bdev_get_queue(bdev));
|
|
max = ALIGN_DOWN(max << SECTOR_SHIFT, inode->i_sb->s_blocksize);
|
|
iov_iter_truncate(from, max);
|
|
|
|
nr_pages = iov_iter_npages(from, BIO_MAX_PAGES);
|
|
if (!nr_pages)
|
|
return 0;
|
|
|
|
bio = bio_alloc_bioset(GFP_NOFS, nr_pages, &fs_bio_set);
|
|
if (!bio)
|
|
return -ENOMEM;
|
|
|
|
bio_set_dev(bio, bdev);
|
|
bio->bi_iter.bi_sector = zi->i_zsector;
|
|
bio->bi_write_hint = iocb->ki_hint;
|
|
bio->bi_ioprio = iocb->ki_ioprio;
|
|
bio->bi_opf = REQ_OP_ZONE_APPEND | REQ_SYNC | REQ_IDLE;
|
|
if (iocb->ki_flags & IOCB_DSYNC)
|
|
bio->bi_opf |= REQ_FUA;
|
|
|
|
ret = bio_iov_iter_get_pages(bio, from);
|
|
if (unlikely(ret)) {
|
|
bio_io_error(bio);
|
|
return ret;
|
|
}
|
|
size = bio->bi_iter.bi_size;
|
|
task_io_account_write(ret);
|
|
|
|
if (iocb->ki_flags & IOCB_HIPRI)
|
|
bio_set_polled(bio, iocb);
|
|
|
|
ret = submit_bio_wait(bio);
|
|
|
|
bio_put(bio);
|
|
|
|
zonefs_file_write_dio_end_io(iocb, size, ret, 0);
|
|
if (ret >= 0) {
|
|
iocb->ki_pos += size;
|
|
return size;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Handle direct writes. For sequential zone files, this is the only possible
|
|
* write path. For these files, check that the user is issuing writes
|
|
* sequentially from the end of the file. This code assumes that the block layer
|
|
* delivers write requests to the device in sequential order. This is always the
|
|
* case if a block IO scheduler implementing the ELEVATOR_F_ZBD_SEQ_WRITE
|
|
* elevator feature is being used (e.g. mq-deadline). The block layer always
|
|
* automatically select such an elevator for zoned block devices during the
|
|
* device initialization.
|
|
*/
|
|
static ssize_t zonefs_file_dio_write(struct kiocb *iocb, struct iov_iter *from)
|
|
{
|
|
struct inode *inode = file_inode(iocb->ki_filp);
|
|
struct zonefs_inode_info *zi = ZONEFS_I(inode);
|
|
struct super_block *sb = inode->i_sb;
|
|
bool sync = is_sync_kiocb(iocb);
|
|
bool append = false;
|
|
size_t count;
|
|
ssize_t ret;
|
|
|
|
/*
|
|
* For async direct IOs to sequential zone files, refuse IOCB_NOWAIT
|
|
* as this can cause write reordering (e.g. the first aio gets EAGAIN
|
|
* on the inode lock but the second goes through but is now unaligned).
|
|
*/
|
|
if (zi->i_ztype == ZONEFS_ZTYPE_SEQ && !sync &&
|
|
(iocb->ki_flags & IOCB_NOWAIT))
|
|
return -EOPNOTSUPP;
|
|
|
|
if (iocb->ki_flags & IOCB_NOWAIT) {
|
|
if (!inode_trylock(inode))
|
|
return -EAGAIN;
|
|
} else {
|
|
inode_lock(inode);
|
|
}
|
|
|
|
ret = generic_write_checks(iocb, from);
|
|
if (ret <= 0)
|
|
goto inode_unlock;
|
|
|
|
iov_iter_truncate(from, zi->i_max_size - iocb->ki_pos);
|
|
count = iov_iter_count(from);
|
|
|
|
if ((iocb->ki_pos | count) & (sb->s_blocksize - 1)) {
|
|
ret = -EINVAL;
|
|
goto inode_unlock;
|
|
}
|
|
|
|
/* Enforce sequential writes (append only) in sequential zones */
|
|
if (zi->i_ztype == ZONEFS_ZTYPE_SEQ) {
|
|
mutex_lock(&zi->i_truncate_mutex);
|
|
if (iocb->ki_pos != zi->i_wpoffset) {
|
|
mutex_unlock(&zi->i_truncate_mutex);
|
|
ret = -EINVAL;
|
|
goto inode_unlock;
|
|
}
|
|
mutex_unlock(&zi->i_truncate_mutex);
|
|
append = sync;
|
|
}
|
|
|
|
if (append)
|
|
ret = zonefs_file_dio_append(iocb, from);
|
|
else
|
|
ret = iomap_dio_rw(iocb, from, &zonefs_iomap_ops,
|
|
&zonefs_write_dio_ops, sync);
|
|
if (zi->i_ztype == ZONEFS_ZTYPE_SEQ &&
|
|
(ret > 0 || ret == -EIOCBQUEUED)) {
|
|
if (ret > 0)
|
|
count = ret;
|
|
mutex_lock(&zi->i_truncate_mutex);
|
|
zi->i_wpoffset += count;
|
|
mutex_unlock(&zi->i_truncate_mutex);
|
|
}
|
|
|
|
inode_unlock:
|
|
inode_unlock(inode);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static ssize_t zonefs_file_buffered_write(struct kiocb *iocb,
|
|
struct iov_iter *from)
|
|
{
|
|
struct inode *inode = file_inode(iocb->ki_filp);
|
|
struct zonefs_inode_info *zi = ZONEFS_I(inode);
|
|
ssize_t ret;
|
|
|
|
/*
|
|
* Direct IO writes are mandatory for sequential zone files so that the
|
|
* write IO issuing order is preserved.
|
|
*/
|
|
if (zi->i_ztype != ZONEFS_ZTYPE_CNV)
|
|
return -EIO;
|
|
|
|
if (iocb->ki_flags & IOCB_NOWAIT) {
|
|
if (!inode_trylock(inode))
|
|
return -EAGAIN;
|
|
} else {
|
|
inode_lock(inode);
|
|
}
|
|
|
|
ret = generic_write_checks(iocb, from);
|
|
if (ret <= 0)
|
|
goto inode_unlock;
|
|
|
|
iov_iter_truncate(from, zi->i_max_size - iocb->ki_pos);
|
|
|
|
ret = iomap_file_buffered_write(iocb, from, &zonefs_iomap_ops);
|
|
if (ret > 0)
|
|
iocb->ki_pos += ret;
|
|
else if (ret == -EIO)
|
|
zonefs_io_error(inode, true);
|
|
|
|
inode_unlock:
|
|
inode_unlock(inode);
|
|
if (ret > 0)
|
|
ret = generic_write_sync(iocb, ret);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static ssize_t zonefs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
|
|
{
|
|
struct inode *inode = file_inode(iocb->ki_filp);
|
|
|
|
if (unlikely(IS_IMMUTABLE(inode)))
|
|
return -EPERM;
|
|
|
|
if (sb_rdonly(inode->i_sb))
|
|
return -EROFS;
|
|
|
|
/* Write operations beyond the zone size are not allowed */
|
|
if (iocb->ki_pos >= ZONEFS_I(inode)->i_max_size)
|
|
return -EFBIG;
|
|
|
|
if (iocb->ki_flags & IOCB_DIRECT) {
|
|
ssize_t ret = zonefs_file_dio_write(iocb, from);
|
|
if (ret != -ENOTBLK)
|
|
return ret;
|
|
}
|
|
|
|
return zonefs_file_buffered_write(iocb, from);
|
|
}
|
|
|
|
static int zonefs_file_read_dio_end_io(struct kiocb *iocb, ssize_t size,
|
|
int error, unsigned int flags)
|
|
{
|
|
if (error) {
|
|
zonefs_io_error(file_inode(iocb->ki_filp), false);
|
|
return error;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct iomap_dio_ops zonefs_read_dio_ops = {
|
|
.end_io = zonefs_file_read_dio_end_io,
|
|
};
|
|
|
|
static ssize_t zonefs_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
|
|
{
|
|
struct inode *inode = file_inode(iocb->ki_filp);
|
|
struct zonefs_inode_info *zi = ZONEFS_I(inode);
|
|
struct super_block *sb = inode->i_sb;
|
|
loff_t isize;
|
|
ssize_t ret;
|
|
|
|
/* Offline zones cannot be read */
|
|
if (unlikely(IS_IMMUTABLE(inode) && !(inode->i_mode & 0777)))
|
|
return -EPERM;
|
|
|
|
if (iocb->ki_pos >= zi->i_max_size)
|
|
return 0;
|
|
|
|
if (iocb->ki_flags & IOCB_NOWAIT) {
|
|
if (!inode_trylock_shared(inode))
|
|
return -EAGAIN;
|
|
} else {
|
|
inode_lock_shared(inode);
|
|
}
|
|
|
|
/* Limit read operations to written data */
|
|
mutex_lock(&zi->i_truncate_mutex);
|
|
isize = i_size_read(inode);
|
|
if (iocb->ki_pos >= isize) {
|
|
mutex_unlock(&zi->i_truncate_mutex);
|
|
ret = 0;
|
|
goto inode_unlock;
|
|
}
|
|
iov_iter_truncate(to, isize - iocb->ki_pos);
|
|
mutex_unlock(&zi->i_truncate_mutex);
|
|
|
|
if (iocb->ki_flags & IOCB_DIRECT) {
|
|
size_t count = iov_iter_count(to);
|
|
|
|
if ((iocb->ki_pos | count) & (sb->s_blocksize - 1)) {
|
|
ret = -EINVAL;
|
|
goto inode_unlock;
|
|
}
|
|
file_accessed(iocb->ki_filp);
|
|
ret = iomap_dio_rw(iocb, to, &zonefs_iomap_ops,
|
|
&zonefs_read_dio_ops, is_sync_kiocb(iocb));
|
|
} else {
|
|
ret = generic_file_read_iter(iocb, to);
|
|
if (ret == -EIO)
|
|
zonefs_io_error(inode, false);
|
|
}
|
|
|
|
inode_unlock:
|
|
inode_unlock_shared(inode);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static const struct file_operations zonefs_file_operations = {
|
|
.open = generic_file_open,
|
|
.fsync = zonefs_file_fsync,
|
|
.mmap = zonefs_file_mmap,
|
|
.llseek = zonefs_file_llseek,
|
|
.read_iter = zonefs_file_read_iter,
|
|
.write_iter = zonefs_file_write_iter,
|
|
.splice_read = generic_file_splice_read,
|
|
.splice_write = iter_file_splice_write,
|
|
.iopoll = iomap_dio_iopoll,
|
|
};
|
|
|
|
static struct kmem_cache *zonefs_inode_cachep;
|
|
|
|
static struct inode *zonefs_alloc_inode(struct super_block *sb)
|
|
{
|
|
struct zonefs_inode_info *zi;
|
|
|
|
zi = kmem_cache_alloc(zonefs_inode_cachep, GFP_KERNEL);
|
|
if (!zi)
|
|
return NULL;
|
|
|
|
inode_init_once(&zi->i_vnode);
|
|
mutex_init(&zi->i_truncate_mutex);
|
|
init_rwsem(&zi->i_mmap_sem);
|
|
|
|
return &zi->i_vnode;
|
|
}
|
|
|
|
static void zonefs_free_inode(struct inode *inode)
|
|
{
|
|
kmem_cache_free(zonefs_inode_cachep, ZONEFS_I(inode));
|
|
}
|
|
|
|
/*
|
|
* File system stat.
|
|
*/
|
|
static int zonefs_statfs(struct dentry *dentry, struct kstatfs *buf)
|
|
{
|
|
struct super_block *sb = dentry->d_sb;
|
|
struct zonefs_sb_info *sbi = ZONEFS_SB(sb);
|
|
enum zonefs_ztype t;
|
|
u64 fsid;
|
|
|
|
buf->f_type = ZONEFS_MAGIC;
|
|
buf->f_bsize = sb->s_blocksize;
|
|
buf->f_namelen = ZONEFS_NAME_MAX;
|
|
|
|
spin_lock(&sbi->s_lock);
|
|
|
|
buf->f_blocks = sbi->s_blocks;
|
|
if (WARN_ON(sbi->s_used_blocks > sbi->s_blocks))
|
|
buf->f_bfree = 0;
|
|
else
|
|
buf->f_bfree = buf->f_blocks - sbi->s_used_blocks;
|
|
buf->f_bavail = buf->f_bfree;
|
|
|
|
for (t = 0; t < ZONEFS_ZTYPE_MAX; t++) {
|
|
if (sbi->s_nr_files[t])
|
|
buf->f_files += sbi->s_nr_files[t] + 1;
|
|
}
|
|
buf->f_ffree = 0;
|
|
|
|
spin_unlock(&sbi->s_lock);
|
|
|
|
fsid = le64_to_cpup((void *)sbi->s_uuid.b) ^
|
|
le64_to_cpup((void *)sbi->s_uuid.b + sizeof(u64));
|
|
buf->f_fsid.val[0] = (u32)fsid;
|
|
buf->f_fsid.val[1] = (u32)(fsid >> 32);
|
|
|
|
return 0;
|
|
}
|
|
|
|
enum {
|
|
Opt_errors_ro, Opt_errors_zro, Opt_errors_zol, Opt_errors_repair,
|
|
Opt_err,
|
|
};
|
|
|
|
static const match_table_t tokens = {
|
|
{ Opt_errors_ro, "errors=remount-ro"},
|
|
{ Opt_errors_zro, "errors=zone-ro"},
|
|
{ Opt_errors_zol, "errors=zone-offline"},
|
|
{ Opt_errors_repair, "errors=repair"},
|
|
{ Opt_err, NULL}
|
|
};
|
|
|
|
static int zonefs_parse_options(struct super_block *sb, char *options)
|
|
{
|
|
struct zonefs_sb_info *sbi = ZONEFS_SB(sb);
|
|
substring_t args[MAX_OPT_ARGS];
|
|
char *p;
|
|
|
|
if (!options)
|
|
return 0;
|
|
|
|
while ((p = strsep(&options, ",")) != NULL) {
|
|
int token;
|
|
|
|
if (!*p)
|
|
continue;
|
|
|
|
token = match_token(p, tokens, args);
|
|
switch (token) {
|
|
case Opt_errors_ro:
|
|
sbi->s_mount_opts &= ~ZONEFS_MNTOPT_ERRORS_MASK;
|
|
sbi->s_mount_opts |= ZONEFS_MNTOPT_ERRORS_RO;
|
|
break;
|
|
case Opt_errors_zro:
|
|
sbi->s_mount_opts &= ~ZONEFS_MNTOPT_ERRORS_MASK;
|
|
sbi->s_mount_opts |= ZONEFS_MNTOPT_ERRORS_ZRO;
|
|
break;
|
|
case Opt_errors_zol:
|
|
sbi->s_mount_opts &= ~ZONEFS_MNTOPT_ERRORS_MASK;
|
|
sbi->s_mount_opts |= ZONEFS_MNTOPT_ERRORS_ZOL;
|
|
break;
|
|
case Opt_errors_repair:
|
|
sbi->s_mount_opts &= ~ZONEFS_MNTOPT_ERRORS_MASK;
|
|
sbi->s_mount_opts |= ZONEFS_MNTOPT_ERRORS_REPAIR;
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int zonefs_show_options(struct seq_file *seq, struct dentry *root)
|
|
{
|
|
struct zonefs_sb_info *sbi = ZONEFS_SB(root->d_sb);
|
|
|
|
if (sbi->s_mount_opts & ZONEFS_MNTOPT_ERRORS_RO)
|
|
seq_puts(seq, ",errors=remount-ro");
|
|
if (sbi->s_mount_opts & ZONEFS_MNTOPT_ERRORS_ZRO)
|
|
seq_puts(seq, ",errors=zone-ro");
|
|
if (sbi->s_mount_opts & ZONEFS_MNTOPT_ERRORS_ZOL)
|
|
seq_puts(seq, ",errors=zone-offline");
|
|
if (sbi->s_mount_opts & ZONEFS_MNTOPT_ERRORS_REPAIR)
|
|
seq_puts(seq, ",errors=repair");
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int zonefs_remount(struct super_block *sb, int *flags, char *data)
|
|
{
|
|
sync_filesystem(sb);
|
|
|
|
return zonefs_parse_options(sb, data);
|
|
}
|
|
|
|
static const struct super_operations zonefs_sops = {
|
|
.alloc_inode = zonefs_alloc_inode,
|
|
.free_inode = zonefs_free_inode,
|
|
.statfs = zonefs_statfs,
|
|
.remount_fs = zonefs_remount,
|
|
.show_options = zonefs_show_options,
|
|
};
|
|
|
|
static const struct inode_operations zonefs_dir_inode_operations = {
|
|
.lookup = simple_lookup,
|
|
.setattr = zonefs_inode_setattr,
|
|
};
|
|
|
|
static void zonefs_init_dir_inode(struct inode *parent, struct inode *inode,
|
|
enum zonefs_ztype type)
|
|
{
|
|
struct super_block *sb = parent->i_sb;
|
|
|
|
inode->i_ino = blkdev_nr_zones(sb->s_bdev->bd_disk) + type + 1;
|
|
inode_init_owner(inode, parent, S_IFDIR | 0555);
|
|
inode->i_op = &zonefs_dir_inode_operations;
|
|
inode->i_fop = &simple_dir_operations;
|
|
set_nlink(inode, 2);
|
|
inc_nlink(parent);
|
|
}
|
|
|
|
static void zonefs_init_file_inode(struct inode *inode, struct blk_zone *zone,
|
|
enum zonefs_ztype type)
|
|
{
|
|
struct super_block *sb = inode->i_sb;
|
|
struct zonefs_sb_info *sbi = ZONEFS_SB(sb);
|
|
struct zonefs_inode_info *zi = ZONEFS_I(inode);
|
|
|
|
inode->i_ino = zone->start >> sbi->s_zone_sectors_shift;
|
|
inode->i_mode = S_IFREG | sbi->s_perm;
|
|
|
|
zi->i_ztype = type;
|
|
zi->i_zsector = zone->start;
|
|
zi->i_zone_size = zone->len << SECTOR_SHIFT;
|
|
|
|
zi->i_max_size = min_t(loff_t, MAX_LFS_FILESIZE,
|
|
zone->capacity << SECTOR_SHIFT);
|
|
zi->i_wpoffset = zonefs_check_zone_condition(inode, zone, true, true);
|
|
|
|
inode->i_uid = sbi->s_uid;
|
|
inode->i_gid = sbi->s_gid;
|
|
inode->i_size = zi->i_wpoffset;
|
|
inode->i_blocks = zi->i_max_size >> SECTOR_SHIFT;
|
|
|
|
inode->i_op = &zonefs_file_inode_operations;
|
|
inode->i_fop = &zonefs_file_operations;
|
|
inode->i_mapping->a_ops = &zonefs_file_aops;
|
|
|
|
sb->s_maxbytes = max(zi->i_max_size, sb->s_maxbytes);
|
|
sbi->s_blocks += zi->i_max_size >> sb->s_blocksize_bits;
|
|
sbi->s_used_blocks += zi->i_wpoffset >> sb->s_blocksize_bits;
|
|
}
|
|
|
|
static struct dentry *zonefs_create_inode(struct dentry *parent,
|
|
const char *name, struct blk_zone *zone,
|
|
enum zonefs_ztype type)
|
|
{
|
|
struct inode *dir = d_inode(parent);
|
|
struct dentry *dentry;
|
|
struct inode *inode;
|
|
|
|
dentry = d_alloc_name(parent, name);
|
|
if (!dentry)
|
|
return NULL;
|
|
|
|
inode = new_inode(parent->d_sb);
|
|
if (!inode)
|
|
goto dput;
|
|
|
|
inode->i_ctime = inode->i_mtime = inode->i_atime = dir->i_ctime;
|
|
if (zone)
|
|
zonefs_init_file_inode(inode, zone, type);
|
|
else
|
|
zonefs_init_dir_inode(dir, inode, type);
|
|
d_add(dentry, inode);
|
|
dir->i_size++;
|
|
|
|
return dentry;
|
|
|
|
dput:
|
|
dput(dentry);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
struct zonefs_zone_data {
|
|
struct super_block *sb;
|
|
unsigned int nr_zones[ZONEFS_ZTYPE_MAX];
|
|
struct blk_zone *zones;
|
|
};
|
|
|
|
/*
|
|
* Create a zone group and populate it with zone files.
|
|
*/
|
|
static int zonefs_create_zgroup(struct zonefs_zone_data *zd,
|
|
enum zonefs_ztype type)
|
|
{
|
|
struct super_block *sb = zd->sb;
|
|
struct zonefs_sb_info *sbi = ZONEFS_SB(sb);
|
|
struct blk_zone *zone, *next, *end;
|
|
const char *zgroup_name;
|
|
char *file_name;
|
|
struct dentry *dir;
|
|
unsigned int n = 0;
|
|
int ret;
|
|
|
|
/* If the group is empty, there is nothing to do */
|
|
if (!zd->nr_zones[type])
|
|
return 0;
|
|
|
|
file_name = kmalloc(ZONEFS_NAME_MAX, GFP_KERNEL);
|
|
if (!file_name)
|
|
return -ENOMEM;
|
|
|
|
if (type == ZONEFS_ZTYPE_CNV)
|
|
zgroup_name = "cnv";
|
|
else
|
|
zgroup_name = "seq";
|
|
|
|
dir = zonefs_create_inode(sb->s_root, zgroup_name, NULL, type);
|
|
if (!dir) {
|
|
ret = -ENOMEM;
|
|
goto free;
|
|
}
|
|
|
|
/*
|
|
* The first zone contains the super block: skip it.
|
|
*/
|
|
end = zd->zones + blkdev_nr_zones(sb->s_bdev->bd_disk);
|
|
for (zone = &zd->zones[1]; zone < end; zone = next) {
|
|
|
|
next = zone + 1;
|
|
if (zonefs_zone_type(zone) != type)
|
|
continue;
|
|
|
|
/*
|
|
* For conventional zones, contiguous zones can be aggregated
|
|
* together to form larger files. Note that this overwrites the
|
|
* length of the first zone of the set of contiguous zones
|
|
* aggregated together. If one offline or read-only zone is
|
|
* found, assume that all zones aggregated have the same
|
|
* condition.
|
|
*/
|
|
if (type == ZONEFS_ZTYPE_CNV &&
|
|
(sbi->s_features & ZONEFS_F_AGGRCNV)) {
|
|
for (; next < end; next++) {
|
|
if (zonefs_zone_type(next) != type)
|
|
break;
|
|
zone->len += next->len;
|
|
zone->capacity += next->capacity;
|
|
if (next->cond == BLK_ZONE_COND_READONLY &&
|
|
zone->cond != BLK_ZONE_COND_OFFLINE)
|
|
zone->cond = BLK_ZONE_COND_READONLY;
|
|
else if (next->cond == BLK_ZONE_COND_OFFLINE)
|
|
zone->cond = BLK_ZONE_COND_OFFLINE;
|
|
}
|
|
if (zone->capacity != zone->len) {
|
|
zonefs_err(sb, "Invalid conventional zone capacity\n");
|
|
ret = -EINVAL;
|
|
goto free;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Use the file number within its group as file name.
|
|
*/
|
|
snprintf(file_name, ZONEFS_NAME_MAX - 1, "%u", n);
|
|
if (!zonefs_create_inode(dir, file_name, zone, type)) {
|
|
ret = -ENOMEM;
|
|
goto free;
|
|
}
|
|
|
|
n++;
|
|
}
|
|
|
|
zonefs_info(sb, "Zone group \"%s\" has %u file%s\n",
|
|
zgroup_name, n, n > 1 ? "s" : "");
|
|
|
|
sbi->s_nr_files[type] = n;
|
|
ret = 0;
|
|
|
|
free:
|
|
kfree(file_name);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int zonefs_get_zone_info_cb(struct blk_zone *zone, unsigned int idx,
|
|
void *data)
|
|
{
|
|
struct zonefs_zone_data *zd = data;
|
|
|
|
/*
|
|
* Count the number of usable zones: the first zone at index 0 contains
|
|
* the super block and is ignored.
|
|
*/
|
|
switch (zone->type) {
|
|
case BLK_ZONE_TYPE_CONVENTIONAL:
|
|
zone->wp = zone->start + zone->len;
|
|
if (idx)
|
|
zd->nr_zones[ZONEFS_ZTYPE_CNV]++;
|
|
break;
|
|
case BLK_ZONE_TYPE_SEQWRITE_REQ:
|
|
case BLK_ZONE_TYPE_SEQWRITE_PREF:
|
|
if (idx)
|
|
zd->nr_zones[ZONEFS_ZTYPE_SEQ]++;
|
|
break;
|
|
default:
|
|
zonefs_err(zd->sb, "Unsupported zone type 0x%x\n",
|
|
zone->type);
|
|
return -EIO;
|
|
}
|
|
|
|
memcpy(&zd->zones[idx], zone, sizeof(struct blk_zone));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int zonefs_get_zone_info(struct zonefs_zone_data *zd)
|
|
{
|
|
struct block_device *bdev = zd->sb->s_bdev;
|
|
int ret;
|
|
|
|
zd->zones = kvcalloc(blkdev_nr_zones(bdev->bd_disk),
|
|
sizeof(struct blk_zone), GFP_KERNEL);
|
|
if (!zd->zones)
|
|
return -ENOMEM;
|
|
|
|
/* Get zones information from the device */
|
|
ret = blkdev_report_zones(bdev, 0, BLK_ALL_ZONES,
|
|
zonefs_get_zone_info_cb, zd);
|
|
if (ret < 0) {
|
|
zonefs_err(zd->sb, "Zone report failed %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
if (ret != blkdev_nr_zones(bdev->bd_disk)) {
|
|
zonefs_err(zd->sb, "Invalid zone report (%d/%u zones)\n",
|
|
ret, blkdev_nr_zones(bdev->bd_disk));
|
|
return -EIO;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline void zonefs_cleanup_zone_info(struct zonefs_zone_data *zd)
|
|
{
|
|
kvfree(zd->zones);
|
|
}
|
|
|
|
/*
|
|
* Read super block information from the device.
|
|
*/
|
|
static int zonefs_read_super(struct super_block *sb)
|
|
{
|
|
struct zonefs_sb_info *sbi = ZONEFS_SB(sb);
|
|
struct zonefs_super *super;
|
|
u32 crc, stored_crc;
|
|
struct page *page;
|
|
struct bio_vec bio_vec;
|
|
struct bio bio;
|
|
int ret;
|
|
|
|
page = alloc_page(GFP_KERNEL);
|
|
if (!page)
|
|
return -ENOMEM;
|
|
|
|
bio_init(&bio, &bio_vec, 1);
|
|
bio.bi_iter.bi_sector = 0;
|
|
bio.bi_opf = REQ_OP_READ;
|
|
bio_set_dev(&bio, sb->s_bdev);
|
|
bio_add_page(&bio, page, PAGE_SIZE, 0);
|
|
|
|
ret = submit_bio_wait(&bio);
|
|
if (ret)
|
|
goto free_page;
|
|
|
|
super = kmap(page);
|
|
|
|
ret = -EINVAL;
|
|
if (le32_to_cpu(super->s_magic) != ZONEFS_MAGIC)
|
|
goto unmap;
|
|
|
|
stored_crc = le32_to_cpu(super->s_crc);
|
|
super->s_crc = 0;
|
|
crc = crc32(~0U, (unsigned char *)super, sizeof(struct zonefs_super));
|
|
if (crc != stored_crc) {
|
|
zonefs_err(sb, "Invalid checksum (Expected 0x%08x, got 0x%08x)",
|
|
crc, stored_crc);
|
|
goto unmap;
|
|
}
|
|
|
|
sbi->s_features = le64_to_cpu(super->s_features);
|
|
if (sbi->s_features & ~ZONEFS_F_DEFINED_FEATURES) {
|
|
zonefs_err(sb, "Unknown features set 0x%llx\n",
|
|
sbi->s_features);
|
|
goto unmap;
|
|
}
|
|
|
|
if (sbi->s_features & ZONEFS_F_UID) {
|
|
sbi->s_uid = make_kuid(current_user_ns(),
|
|
le32_to_cpu(super->s_uid));
|
|
if (!uid_valid(sbi->s_uid)) {
|
|
zonefs_err(sb, "Invalid UID feature\n");
|
|
goto unmap;
|
|
}
|
|
}
|
|
|
|
if (sbi->s_features & ZONEFS_F_GID) {
|
|
sbi->s_gid = make_kgid(current_user_ns(),
|
|
le32_to_cpu(super->s_gid));
|
|
if (!gid_valid(sbi->s_gid)) {
|
|
zonefs_err(sb, "Invalid GID feature\n");
|
|
goto unmap;
|
|
}
|
|
}
|
|
|
|
if (sbi->s_features & ZONEFS_F_PERM)
|
|
sbi->s_perm = le32_to_cpu(super->s_perm);
|
|
|
|
if (memchr_inv(super->s_reserved, 0, sizeof(super->s_reserved))) {
|
|
zonefs_err(sb, "Reserved area is being used\n");
|
|
goto unmap;
|
|
}
|
|
|
|
import_uuid(&sbi->s_uuid, super->s_uuid);
|
|
ret = 0;
|
|
|
|
unmap:
|
|
kunmap(page);
|
|
free_page:
|
|
__free_page(page);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Check that the device is zoned. If it is, get the list of zones and create
|
|
* sub-directories and files according to the device zone configuration and
|
|
* format options.
|
|
*/
|
|
static int zonefs_fill_super(struct super_block *sb, void *data, int silent)
|
|
{
|
|
struct zonefs_zone_data zd;
|
|
struct zonefs_sb_info *sbi;
|
|
struct inode *inode;
|
|
enum zonefs_ztype t;
|
|
int ret;
|
|
|
|
if (!bdev_is_zoned(sb->s_bdev)) {
|
|
zonefs_err(sb, "Not a zoned block device\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* Initialize super block information: the maximum file size is updated
|
|
* when the zone files are created so that the format option
|
|
* ZONEFS_F_AGGRCNV which increases the maximum file size of a file
|
|
* beyond the zone size is taken into account.
|
|
*/
|
|
sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
|
|
if (!sbi)
|
|
return -ENOMEM;
|
|
|
|
spin_lock_init(&sbi->s_lock);
|
|
sb->s_fs_info = sbi;
|
|
sb->s_magic = ZONEFS_MAGIC;
|
|
sb->s_maxbytes = 0;
|
|
sb->s_op = &zonefs_sops;
|
|
sb->s_time_gran = 1;
|
|
|
|
/*
|
|
* The block size is set to the device physical sector size to ensure
|
|
* that write operations on 512e devices (512B logical block and 4KB
|
|
* physical block) are always aligned to the device physical blocks,
|
|
* as mandated by the ZBC/ZAC specifications.
|
|
*/
|
|
sb_set_blocksize(sb, bdev_physical_block_size(sb->s_bdev));
|
|
sbi->s_zone_sectors_shift = ilog2(bdev_zone_sectors(sb->s_bdev));
|
|
sbi->s_uid = GLOBAL_ROOT_UID;
|
|
sbi->s_gid = GLOBAL_ROOT_GID;
|
|
sbi->s_perm = 0640;
|
|
sbi->s_mount_opts = ZONEFS_MNTOPT_ERRORS_RO;
|
|
|
|
ret = zonefs_read_super(sb);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = zonefs_parse_options(sb, data);
|
|
if (ret)
|
|
return ret;
|
|
|
|
memset(&zd, 0, sizeof(struct zonefs_zone_data));
|
|
zd.sb = sb;
|
|
ret = zonefs_get_zone_info(&zd);
|
|
if (ret)
|
|
goto cleanup;
|
|
|
|
zonefs_info(sb, "Mounting %u zones",
|
|
blkdev_nr_zones(sb->s_bdev->bd_disk));
|
|
|
|
/* Create root directory inode */
|
|
ret = -ENOMEM;
|
|
inode = new_inode(sb);
|
|
if (!inode)
|
|
goto cleanup;
|
|
|
|
inode->i_ino = blkdev_nr_zones(sb->s_bdev->bd_disk);
|
|
inode->i_mode = S_IFDIR | 0555;
|
|
inode->i_ctime = inode->i_mtime = inode->i_atime = current_time(inode);
|
|
inode->i_op = &zonefs_dir_inode_operations;
|
|
inode->i_fop = &simple_dir_operations;
|
|
set_nlink(inode, 2);
|
|
|
|
sb->s_root = d_make_root(inode);
|
|
if (!sb->s_root)
|
|
goto cleanup;
|
|
|
|
/* Create and populate files in zone groups directories */
|
|
for (t = 0; t < ZONEFS_ZTYPE_MAX; t++) {
|
|
ret = zonefs_create_zgroup(&zd, t);
|
|
if (ret)
|
|
break;
|
|
}
|
|
|
|
cleanup:
|
|
zonefs_cleanup_zone_info(&zd);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static struct dentry *zonefs_mount(struct file_system_type *fs_type,
|
|
int flags, const char *dev_name, void *data)
|
|
{
|
|
return mount_bdev(fs_type, flags, dev_name, data, zonefs_fill_super);
|
|
}
|
|
|
|
static void zonefs_kill_super(struct super_block *sb)
|
|
{
|
|
struct zonefs_sb_info *sbi = ZONEFS_SB(sb);
|
|
|
|
if (sb->s_root)
|
|
d_genocide(sb->s_root);
|
|
kill_block_super(sb);
|
|
kfree(sbi);
|
|
}
|
|
|
|
/*
|
|
* File system definition and registration.
|
|
*/
|
|
static struct file_system_type zonefs_type = {
|
|
.owner = THIS_MODULE,
|
|
.name = "zonefs",
|
|
.mount = zonefs_mount,
|
|
.kill_sb = zonefs_kill_super,
|
|
.fs_flags = FS_REQUIRES_DEV,
|
|
};
|
|
|
|
static int __init zonefs_init_inodecache(void)
|
|
{
|
|
zonefs_inode_cachep = kmem_cache_create("zonefs_inode_cache",
|
|
sizeof(struct zonefs_inode_info), 0,
|
|
(SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD | SLAB_ACCOUNT),
|
|
NULL);
|
|
if (zonefs_inode_cachep == NULL)
|
|
return -ENOMEM;
|
|
return 0;
|
|
}
|
|
|
|
static void zonefs_destroy_inodecache(void)
|
|
{
|
|
/*
|
|
* Make sure all delayed rcu free inodes are flushed before we
|
|
* destroy the inode cache.
|
|
*/
|
|
rcu_barrier();
|
|
kmem_cache_destroy(zonefs_inode_cachep);
|
|
}
|
|
|
|
static int __init zonefs_init(void)
|
|
{
|
|
int ret;
|
|
|
|
BUILD_BUG_ON(sizeof(struct zonefs_super) != ZONEFS_SUPER_SIZE);
|
|
|
|
ret = zonefs_init_inodecache();
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = register_filesystem(&zonefs_type);
|
|
if (ret) {
|
|
zonefs_destroy_inodecache();
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __exit zonefs_exit(void)
|
|
{
|
|
zonefs_destroy_inodecache();
|
|
unregister_filesystem(&zonefs_type);
|
|
}
|
|
|
|
MODULE_AUTHOR("Damien Le Moal");
|
|
MODULE_DESCRIPTION("Zone file system for zoned block devices");
|
|
MODULE_LICENSE("GPL");
|
|
module_init(zonefs_init);
|
|
module_exit(zonefs_exit);
|