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1810 lines
46 KiB
1810 lines
46 KiB
// SPDX-License-Identifier: GPL-2.0 |
|
/* |
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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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|
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#include "zonefs.h" |
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|
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#define CREATE_TRACE_POINTS |
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#include "trace.h" |
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|
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static inline int zonefs_zone_mgmt(struct inode *inode, |
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enum req_opf op) |
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{ |
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struct zonefs_inode_info *zi = ZONEFS_I(inode); |
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int ret; |
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|
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lockdep_assert_held(&zi->i_truncate_mutex); |
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|
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trace_zonefs_zone_mgmt(inode, op); |
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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 %s at %llu failed %d\n", |
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blk_op_str(op), zi->i_zsector, ret); |
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return ret; |
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} |
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|
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return 0; |
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} |
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|
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static inline void zonefs_i_size_write(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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|
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i_size_write(inode, isize); |
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/* |
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* A full zone is no longer open/active and does not need |
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* explicit closing. |
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*/ |
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if (isize >= zi->i_max_size) |
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zi->i_flags &= ~ZONEFS_ZONE_OPEN; |
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} |
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|
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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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|
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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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/* |
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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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/* |
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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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|
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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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|
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trace_zonefs_iomap_begin(inode, iomap); |
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|
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return 0; |
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} |
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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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|
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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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|
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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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/* |
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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return iomap_writepage(page, wbc, &wpc, &zonefs_writeback_ops); |
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} |
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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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|
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return iomap_writepages(mapping, wbc, &wpc, &zonefs_writeback_ops); |
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} |
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|
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static int zonefs_swap_activate(struct swap_info_struct *sis, |
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struct file *swap_file, sector_t *span) |
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{ |
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struct inode *inode = file_inode(swap_file); |
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struct zonefs_inode_info *zi = ZONEFS_I(inode); |
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|
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if (zi->i_ztype != ZONEFS_ZTYPE_CNV) { |
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zonefs_err(inode->i_sb, |
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"swap file: not a conventional zone file\n"); |
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return -EINVAL; |
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} |
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|
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return iomap_swapfile_activate(sis, swap_file, span, &zonefs_iomap_ops); |
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} |
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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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.swap_activate = zonefs_swap_activate, |
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}; |
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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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|
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if (new_isize == old_isize) |
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return; |
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|
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spin_lock(&sbi->s_lock); |
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|
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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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|
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spin_unlock(&sbi->s_lock); |
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} |
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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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case BLK_ZONE_COND_FULL: |
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/* The write pointer of full zones is invalid. */ |
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return zi->i_max_size; |
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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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|
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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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|
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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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/* |
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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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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", |
|
inode->i_ino, isize, data_size); |
|
|
|
/* |
|
* First handle bad zones signaled by hardware. The mount options |
|
* errors=zone-ro and errors=zone-offline result in changing the |
|
* 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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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", |
|
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, |
|
false, false); |
|
} |
|
} else if (zone->cond == BLK_ZONE_COND_READONLY || |
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sbi->s_mount_opts & ZONEFS_MNTOPT_ERRORS_ZRO) { |
|
zonefs_warn(sb, "inode %lu: write access disabled\n", |
|
inode->i_ino); |
|
if (zone->cond != BLK_ZONE_COND_READONLY) { |
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zone->cond = BLK_ZONE_COND_READONLY; |
|
data_size = zonefs_check_zone_condition(inode, zone, |
|
false, false); |
|
} |
|
} |
|
|
|
/* |
|
* If the filesystem is mounted with the explicit-open mount option, we |
|
* need to clear the ZONEFS_ZONE_OPEN flag if the zone transitioned to |
|
* the read-only or offline condition, to avoid attempting an explicit |
|
* close of the zone when the inode file is closed. |
|
*/ |
|
if ((sbi->s_mount_opts & ZONEFS_MNTOPT_EXPLICIT_OPEN) && |
|
(zone->cond == BLK_ZONE_COND_OFFLINE || |
|
zone->cond == BLK_ZONE_COND_READONLY)) |
|
zi->i_flags &= ~ZONEFS_ZONE_OPEN; |
|
|
|
/* |
|
* If error=remount-ro was specified, any error result in remounting |
|
* the volume as read-only. |
|
*/ |
|
if ((sbi->s_mount_opts & ZONEFS_MNTOPT_ERRORS_RO) && !sb_rdonly(sb)) { |
|
zonefs_warn(sb, "remounting filesystem read-only\n"); |
|
sb->s_flags |= SB_RDONLY; |
|
} |
|
|
|
/* |
|
* Update block usage stats and the inode size to prevent access to |
|
* invalid data. |
|
*/ |
|
zonefs_update_stats(inode, data_size); |
|
zonefs_i_size_write(inode, data_size); |
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zi->i_wpoffset = data_size; |
|
|
|
return 0; |
|
} |
|
|
|
/* |
|
* When an file IO error occurs, check the file zone to see if there is a change |
|
* in the zone condition (e.g. offline or read-only). For a failed write to a |
|
* sequential zone, the zone write pointer position must also be checked to |
|
* eventually correct the file size and zonefs inode write pointer offset |
|
* (which can be out of sync with the drive due to partial write failures). |
|
*/ |
|
static void __zonefs_io_error(struct inode *inode, bool write) |
|
{ |
|
struct zonefs_inode_info *zi = ZONEFS_I(inode); |
|
struct super_block *sb = inode->i_sb; |
|
struct zonefs_sb_info *sbi = ZONEFS_SB(sb); |
|
unsigned int noio_flag; |
|
unsigned int nr_zones = |
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zi->i_zone_size >> (sbi->s_zone_sectors_shift + SECTOR_SHIFT); |
|
struct zonefs_ioerr_data err = { |
|
.inode = inode, |
|
.write = write, |
|
}; |
|
int ret; |
|
|
|
/* |
|
* Memory allocations in blkdev_report_zones() can trigger a memory |
|
* reclaim which may in turn cause a recursion into zonefs as well as |
|
* struct request allocations for the same device. The former case may |
|
* end up in a deadlock on the inode truncate mutex, while the latter |
|
* may prevent IO forward progress. Executing the report zones under |
|
* the GFP_NOIO context avoids both problems. |
|
*/ |
|
noio_flag = memalloc_noio_save(); |
|
ret = blkdev_report_zones(sb->s_bdev, zi->i_zsector, nr_zones, |
|
zonefs_io_error_cb, &err); |
|
if (ret != nr_zones) |
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zonefs_err(sb, "Get inode %lu zone information failed %d\n", |
|
inode->i_ino, ret); |
|
memalloc_noio_restore(noio_flag); |
|
} |
|
|
|
static void zonefs_io_error(struct inode *inode, bool write) |
|
{ |
|
struct zonefs_inode_info *zi = ZONEFS_I(inode); |
|
|
|
mutex_lock(&zi->i_truncate_mutex); |
|
__zonefs_io_error(inode, write); |
|
mutex_unlock(&zi->i_truncate_mutex); |
|
} |
|
|
|
static int zonefs_file_truncate(struct inode *inode, loff_t isize) |
|
{ |
|
struct zonefs_inode_info *zi = ZONEFS_I(inode); |
|
loff_t old_isize; |
|
enum req_opf op; |
|
int ret = 0; |
|
|
|
/* |
|
* Only sequential zone files can be truncated and truncation is allowed |
|
* only down to a 0 size, which is equivalent to a zone reset, and to |
|
* the maximum file size, which is equivalent to a zone finish. |
|
*/ |
|
if (zi->i_ztype != ZONEFS_ZTYPE_SEQ) |
|
return -EPERM; |
|
|
|
if (!isize) |
|
op = REQ_OP_ZONE_RESET; |
|
else if (isize == zi->i_max_size) |
|
op = REQ_OP_ZONE_FINISH; |
|
else |
|
return -EPERM; |
|
|
|
inode_dio_wait(inode); |
|
|
|
/* Serialize against page faults */ |
|
down_write(&zi->i_mmap_sem); |
|
|
|
/* Serialize against zonefs_iomap_begin() */ |
|
mutex_lock(&zi->i_truncate_mutex); |
|
|
|
old_isize = i_size_read(inode); |
|
if (isize == old_isize) |
|
goto unlock; |
|
|
|
ret = zonefs_zone_mgmt(inode, op); |
|
if (ret) |
|
goto unlock; |
|
|
|
/* |
|
* If the mount option ZONEFS_MNTOPT_EXPLICIT_OPEN is set, |
|
* take care of open zones. |
|
*/ |
|
if (zi->i_flags & ZONEFS_ZONE_OPEN) { |
|
/* |
|
* Truncating a zone to EMPTY or FULL is the equivalent of |
|
* closing the zone. For a truncation to 0, we need to |
|
* re-open the zone to ensure new writes can be processed. |
|
* For a truncation to the maximum file size, the zone is |
|
* closed and writes cannot be accepted anymore, so clear |
|
* the open flag. |
|
*/ |
|
if (!isize) |
|
ret = zonefs_zone_mgmt(inode, REQ_OP_ZONE_OPEN); |
|
else |
|
zi->i_flags &= ~ZONEFS_ZONE_OPEN; |
|
} |
|
|
|
zonefs_update_stats(inode, isize); |
|
truncate_setsize(inode, isize); |
|
zi->i_wpoffset = isize; |
|
|
|
unlock: |
|
mutex_unlock(&zi->i_truncate_mutex); |
|
up_write(&zi->i_mmap_sem); |
|
|
|
return ret; |
|
} |
|
|
|
static int zonefs_inode_setattr(struct user_namespace *mnt_userns, |
|
struct dentry *dentry, struct iattr *iattr) |
|
{ |
|
struct inode *inode = d_inode(dentry); |
|
int ret; |
|
|
|
if (unlikely(IS_IMMUTABLE(inode))) |
|
return -EPERM; |
|
|
|
ret = setattr_prepare(&init_user_ns, dentry, iattr); |
|
if (ret) |
|
return ret; |
|
|
|
/* |
|
* Since files and directories cannot be created nor deleted, do not |
|
* allow setting any write attributes on the sub-directories grouping |
|
* files by zone type. |
|
*/ |
|
if ((iattr->ia_valid & ATTR_MODE) && S_ISDIR(inode->i_mode) && |
|
(iattr->ia_mode & 0222)) |
|
return -EPERM; |
|
|
|
if (((iattr->ia_valid & ATTR_UID) && |
|
!uid_eq(iattr->ia_uid, inode->i_uid)) || |
|
((iattr->ia_valid & ATTR_GID) && |
|
!gid_eq(iattr->ia_gid, inode->i_gid))) { |
|
ret = dquot_transfer(inode, iattr); |
|
if (ret) |
|
return ret; |
|
} |
|
|
|
if (iattr->ia_valid & ATTR_SIZE) { |
|
ret = zonefs_file_truncate(inode, iattr->ia_size); |
|
if (ret) |
|
return ret; |
|
} |
|
|
|
setattr_copy(&init_user_ns, inode, iattr); |
|
|
|
return 0; |
|
} |
|
|
|
static const struct inode_operations zonefs_file_inode_operations = { |
|
.setattr = zonefs_inode_setattr, |
|
}; |
|
|
|
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); |
|
|
|
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); |
|
zonefs_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_VECS); |
|
if (!nr_pages) |
|
return 0; |
|
|
|
bio = bio_alloc(GFP_NOFS, nr_pages); |
|
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)) |
|
goto out_release; |
|
|
|
size = bio->bi_iter.bi_size; |
|
task_io_account_write(size); |
|
|
|
if (iocb->ki_flags & IOCB_HIPRI) |
|
bio_set_polled(bio, iocb); |
|
|
|
ret = submit_bio_wait(bio); |
|
|
|
zonefs_file_write_dio_end_io(iocb, size, ret, 0); |
|
trace_zonefs_file_dio_append(inode, size, ret); |
|
|
|
out_release: |
|
bio_release_pages(bio, false); |
|
bio_put(bio); |
|
|
|
if (ret >= 0) { |
|
iocb->ki_pos += size; |
|
return size; |
|
} |
|
|
|
return ret; |
|
} |
|
|
|
/* |
|
* Do not exceed the LFS limits nor the file zone size. If pos is under the |
|
* limit it becomes a short access. If it exceeds the limit, return -EFBIG. |
|
*/ |
|
static loff_t zonefs_write_check_limits(struct file *file, loff_t pos, |
|
loff_t count) |
|
{ |
|
struct inode *inode = file_inode(file); |
|
struct zonefs_inode_info *zi = ZONEFS_I(inode); |
|
loff_t limit = rlimit(RLIMIT_FSIZE); |
|
loff_t max_size = zi->i_max_size; |
|
|
|
if (limit != RLIM_INFINITY) { |
|
if (pos >= limit) { |
|
send_sig(SIGXFSZ, current, 0); |
|
return -EFBIG; |
|
} |
|
count = min(count, limit - pos); |
|
} |
|
|
|
if (!(file->f_flags & O_LARGEFILE)) |
|
max_size = min_t(loff_t, MAX_NON_LFS, max_size); |
|
|
|
if (unlikely(pos >= max_size)) |
|
return -EFBIG; |
|
|
|
return min(count, max_size - pos); |
|
} |
|
|
|
static ssize_t zonefs_write_checks(struct kiocb *iocb, struct iov_iter *from) |
|
{ |
|
struct file *file = iocb->ki_filp; |
|
struct inode *inode = file_inode(file); |
|
struct zonefs_inode_info *zi = ZONEFS_I(inode); |
|
loff_t count; |
|
|
|
if (IS_SWAPFILE(inode)) |
|
return -ETXTBSY; |
|
|
|
if (!iov_iter_count(from)) |
|
return 0; |
|
|
|
if ((iocb->ki_flags & IOCB_NOWAIT) && !(iocb->ki_flags & IOCB_DIRECT)) |
|
return -EINVAL; |
|
|
|
if (iocb->ki_flags & IOCB_APPEND) { |
|
if (zi->i_ztype != ZONEFS_ZTYPE_SEQ) |
|
return -EINVAL; |
|
mutex_lock(&zi->i_truncate_mutex); |
|
iocb->ki_pos = zi->i_wpoffset; |
|
mutex_unlock(&zi->i_truncate_mutex); |
|
} |
|
|
|
count = zonefs_write_check_limits(file, iocb->ki_pos, |
|
iov_iter_count(from)); |
|
if (count < 0) |
|
return count; |
|
|
|
iov_iter_truncate(from, count); |
|
return iov_iter_count(from); |
|
} |
|
|
|
/* |
|
* 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; |
|
ssize_t ret, count; |
|
|
|
/* |
|
* 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); |
|
} |
|
|
|
count = zonefs_write_checks(iocb, from); |
|
if (count <= 0) { |
|
ret = count; |
|
goto inode_unlock; |
|
} |
|
|
|
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, 0); |
|
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 = zonefs_write_checks(iocb, from); |
|
if (ret <= 0) |
|
goto inode_unlock; |
|
|
|
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, 0); |
|
} 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 inline bool zonefs_file_use_exp_open(struct inode *inode, struct file *file) |
|
{ |
|
struct zonefs_inode_info *zi = ZONEFS_I(inode); |
|
struct zonefs_sb_info *sbi = ZONEFS_SB(inode->i_sb); |
|
|
|
if (!(sbi->s_mount_opts & ZONEFS_MNTOPT_EXPLICIT_OPEN)) |
|
return false; |
|
|
|
if (zi->i_ztype != ZONEFS_ZTYPE_SEQ) |
|
return false; |
|
|
|
if (!(file->f_mode & FMODE_WRITE)) |
|
return false; |
|
|
|
return true; |
|
} |
|
|
|
static int zonefs_open_zone(struct inode *inode) |
|
{ |
|
struct zonefs_inode_info *zi = ZONEFS_I(inode); |
|
struct zonefs_sb_info *sbi = ZONEFS_SB(inode->i_sb); |
|
int ret = 0; |
|
|
|
mutex_lock(&zi->i_truncate_mutex); |
|
|
|
if (!zi->i_wr_refcnt) { |
|
if (atomic_inc_return(&sbi->s_open_zones) > sbi->s_max_open_zones) { |
|
atomic_dec(&sbi->s_open_zones); |
|
ret = -EBUSY; |
|
goto unlock; |
|
} |
|
|
|
if (i_size_read(inode) < zi->i_max_size) { |
|
ret = zonefs_zone_mgmt(inode, REQ_OP_ZONE_OPEN); |
|
if (ret) { |
|
atomic_dec(&sbi->s_open_zones); |
|
goto unlock; |
|
} |
|
zi->i_flags |= ZONEFS_ZONE_OPEN; |
|
} |
|
} |
|
|
|
zi->i_wr_refcnt++; |
|
|
|
unlock: |
|
mutex_unlock(&zi->i_truncate_mutex); |
|
|
|
return ret; |
|
} |
|
|
|
static int zonefs_file_open(struct inode *inode, struct file *file) |
|
{ |
|
int ret; |
|
|
|
ret = generic_file_open(inode, file); |
|
if (ret) |
|
return ret; |
|
|
|
if (zonefs_file_use_exp_open(inode, file)) |
|
return zonefs_open_zone(inode); |
|
|
|
return 0; |
|
} |
|
|
|
static void zonefs_close_zone(struct inode *inode) |
|
{ |
|
struct zonefs_inode_info *zi = ZONEFS_I(inode); |
|
int ret = 0; |
|
|
|
mutex_lock(&zi->i_truncate_mutex); |
|
zi->i_wr_refcnt--; |
|
if (!zi->i_wr_refcnt) { |
|
struct zonefs_sb_info *sbi = ZONEFS_SB(inode->i_sb); |
|
struct super_block *sb = inode->i_sb; |
|
|
|
/* |
|
* If the file zone is full, it is not open anymore and we only |
|
* need to decrement the open count. |
|
*/ |
|
if (!(zi->i_flags & ZONEFS_ZONE_OPEN)) |
|
goto dec; |
|
|
|
ret = zonefs_zone_mgmt(inode, REQ_OP_ZONE_CLOSE); |
|
if (ret) { |
|
__zonefs_io_error(inode, false); |
|
/* |
|
* Leaving zones explicitly open may lead to a state |
|
* where most zones cannot be written (zone resources |
|
* exhausted). So take preventive action by remounting |
|
* read-only. |
|
*/ |
|
if (zi->i_flags & ZONEFS_ZONE_OPEN && |
|
!(sb->s_flags & SB_RDONLY)) { |
|
zonefs_warn(sb, "closing zone failed, remounting filesystem read-only\n"); |
|
sb->s_flags |= SB_RDONLY; |
|
} |
|
} |
|
zi->i_flags &= ~ZONEFS_ZONE_OPEN; |
|
dec: |
|
atomic_dec(&sbi->s_open_zones); |
|
} |
|
mutex_unlock(&zi->i_truncate_mutex); |
|
} |
|
|
|
static int zonefs_file_release(struct inode *inode, struct file *file) |
|
{ |
|
/* |
|
* If we explicitly open a zone we must close it again as well, but the |
|
* zone management operation can fail (either due to an IO error or as |
|
* the zone has gone offline or read-only). Make sure we don't fail the |
|
* close(2) for user-space. |
|
*/ |
|
if (zonefs_file_use_exp_open(inode, file)) |
|
zonefs_close_zone(inode); |
|
|
|
return 0; |
|
} |
|
|
|
static const struct file_operations zonefs_file_operations = { |
|
.open = zonefs_file_open, |
|
.release = zonefs_file_release, |
|
.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); |
|
zi->i_wr_refcnt = 0; |
|
|
|
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 = u64_to_fsid(fsid); |
|
|
|
return 0; |
|
} |
|
|
|
enum { |
|
Opt_errors_ro, Opt_errors_zro, Opt_errors_zol, Opt_errors_repair, |
|
Opt_explicit_open, 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_explicit_open, "explicit-open" }, |
|
{ 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; |
|
case Opt_explicit_open: |
|
sbi->s_mount_opts |= ZONEFS_MNTOPT_EXPLICIT_OPEN; |
|
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(&init_user_ns, 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 zone write granularity to ensure |
|
* that write operations are always aligned according to the device |
|
* interface constraints. |
|
*/ |
|
sb_set_blocksize(sb, bdev_zone_write_granularity(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; |
|
sbi->s_max_open_zones = bdev_max_open_zones(sb->s_bdev); |
|
atomic_set(&sbi->s_open_zones, 0); |
|
if (!sbi->s_max_open_zones && |
|
sbi->s_mount_opts & ZONEFS_MNTOPT_EXPLICIT_OPEN) { |
|
zonefs_info(sb, "No open zones limit. Ignoring explicit_open mount option\n"); |
|
sbi->s_mount_opts &= ~ZONEFS_MNTOPT_EXPLICIT_OPEN; |
|
} |
|
|
|
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);
|
|
|