zonefs: Reorganize code
Move all code related to zone file operations from super.c to the new file.c file. Inode and zone management code remains in super.c. Signed-off-by: Damien Le Moal <damien.lemoal@opensource.wdc.com> Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
This commit is contained in:
Damien Le Moal
parent
2241ab53cb
commit
4008e2a0b0
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@ -3,4 +3,4 @@ ccflags-y += -I$(src)
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obj-$(CONFIG_ZONEFS_FS) += zonefs.o
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zonefs-y := super.o sysfs.o
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zonefs-y := super.o file.o sysfs.o
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@ -0,0 +1,874 @@
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// 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) 2022 Western Digital Corporation or its affiliates.
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*/
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#include <linux/module.h>
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#include <linux/pagemap.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/task_io_accounting_ops.h>
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#include "zonefs.h"
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#include "trace.h"
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static int zonefs_read_iomap_begin(struct inode *inode, loff_t offset,
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loff_t length, unsigned int flags,
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struct iomap *iomap, 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 blocks are always mapped below EOF. If reading past EOF,
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* act as if there is a hole up to the file maximum size.
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*/
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mutex_lock(&zi->i_truncate_mutex);
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iomap->bdev = inode->i_sb->s_bdev;
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iomap->offset = ALIGN_DOWN(offset, sb->s_blocksize);
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isize = i_size_read(inode);
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if (iomap->offset >= isize) {
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iomap->type = IOMAP_HOLE;
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iomap->addr = IOMAP_NULL_ADDR;
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iomap->length = length;
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} else {
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iomap->type = IOMAP_MAPPED;
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iomap->addr = (zi->i_zsector << SECTOR_SHIFT) + iomap->offset;
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iomap->length = isize - iomap->offset;
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}
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mutex_unlock(&zi->i_truncate_mutex);
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trace_zonefs_iomap_begin(inode, iomap);
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return 0;
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}
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static const struct iomap_ops zonefs_read_iomap_ops = {
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.iomap_begin = zonefs_read_iomap_begin,
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};
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static int zonefs_write_iomap_begin(struct inode *inode, loff_t offset,
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loff_t length, unsigned int flags,
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struct iomap *iomap, 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 write 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_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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iomap->bdev = inode->i_sb->s_bdev;
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iomap->offset = ALIGN_DOWN(offset, sb->s_blocksize);
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iomap->addr = (zi->i_zsector << SECTOR_SHIFT) + iomap->offset;
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isize = i_size_read(inode);
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if (iomap->offset >= isize) {
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iomap->type = IOMAP_UNWRITTEN;
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iomap->length = zi->i_max_size - iomap->offset;
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} else {
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iomap->type = IOMAP_MAPPED;
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iomap->length = isize - iomap->offset;
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}
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mutex_unlock(&zi->i_truncate_mutex);
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trace_zonefs_iomap_begin(inode, iomap);
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return 0;
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}
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static const struct iomap_ops zonefs_write_iomap_ops = {
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.iomap_begin = zonefs_write_iomap_begin,
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};
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static int zonefs_read_folio(struct file *unused, struct folio *folio)
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{
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return iomap_read_folio(folio, &zonefs_read_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_read_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_write_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_write_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_write_map_blocks,
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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 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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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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return iomap_swapfile_activate(sis, swap_file, span,
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&zonefs_read_iomap_ops);
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}
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const struct address_space_operations zonefs_file_aops = {
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.read_folio = zonefs_read_folio,
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.readahead = zonefs_readahead,
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.writepages = zonefs_writepages,
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.dirty_folio = filemap_dirty_folio,
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.release_folio = iomap_release_folio,
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.invalidate_folio = iomap_invalidate_folio,
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.migrate_folio = filemap_migrate_folio,
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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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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_op 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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filemap_invalidate_lock(inode->i_mapping);
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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 = zonefs_zone_mgmt(inode, op);
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if (ret)
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goto unlock;
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/*
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* If the mount option ZONEFS_MNTOPT_EXPLICIT_OPEN is set,
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* take care of open zones.
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*/
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if (zi->i_flags & ZONEFS_ZONE_OPEN) {
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/*
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* Truncating a zone to EMPTY or FULL is the equivalent of
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* closing the zone. For a truncation to 0, we need to
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* re-open the zone to ensure new writes can be processed.
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* For a truncation to the maximum file size, the zone is
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* closed and writes cannot be accepted anymore, so clear
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* the open flag.
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*/
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if (!isize)
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ret = zonefs_zone_mgmt(inode, REQ_OP_ZONE_OPEN);
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else
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zi->i_flags &= ~ZONEFS_ZONE_OPEN;
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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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zonefs_account_active(inode);
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unlock:
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mutex_unlock(&zi->i_truncate_mutex);
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filemap_invalidate_unlock(inode->i_mapping);
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return ret;
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}
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static int zonefs_file_fsync(struct file *file, loff_t start, loff_t end,
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int datasync)
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{
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struct inode *inode = file_inode(file);
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int ret = 0;
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if (unlikely(IS_IMMUTABLE(inode)))
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return -EPERM;
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/*
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* Since only direct writes are allowed in sequential files, page cache
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* flush is needed only for conventional zone files.
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*/
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if (ZONEFS_I(inode)->i_ztype == ZONEFS_ZTYPE_CNV)
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ret = file_write_and_wait_range(file, start, end);
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if (!ret)
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ret = blkdev_issue_flush(inode->i_sb->s_bdev);
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if (ret)
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zonefs_io_error(inode, true);
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return ret;
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}
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static vm_fault_t zonefs_filemap_page_mkwrite(struct vm_fault *vmf)
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{
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struct inode *inode = file_inode(vmf->vma->vm_file);
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struct zonefs_inode_info *zi = ZONEFS_I(inode);
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vm_fault_t ret;
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if (unlikely(IS_IMMUTABLE(inode)))
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return VM_FAULT_SIGBUS;
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/*
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* Sanity check: only conventional zone files can have shared
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* writeable mappings.
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*/
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if (WARN_ON_ONCE(zi->i_ztype != ZONEFS_ZTYPE_CNV))
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return VM_FAULT_NOPAGE;
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sb_start_pagefault(inode->i_sb);
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file_update_time(vmf->vma->vm_file);
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/* Serialize against truncates */
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filemap_invalidate_lock_shared(inode->i_mapping);
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ret = iomap_page_mkwrite(vmf, &zonefs_write_iomap_ops);
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filemap_invalidate_unlock_shared(inode->i_mapping);
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sb_end_pagefault(inode->i_sb);
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return ret;
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}
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static const struct vm_operations_struct zonefs_file_vm_ops = {
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.fault = filemap_fault,
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.map_pages = filemap_map_pages,
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.page_mkwrite = zonefs_filemap_page_mkwrite,
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};
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static int zonefs_file_mmap(struct file *file, struct vm_area_struct *vma)
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{
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/*
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* Conventional zones accept random writes, so their files can support
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* shared writable mappings. For sequential zone files, only read
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* mappings are possible since there are no guarantees for write
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* ordering between msync() and page cache writeback.
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*/
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if (ZONEFS_I(file_inode(file))->i_ztype == ZONEFS_ZTYPE_SEQ &&
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(vma->vm_flags & VM_SHARED) && (vma->vm_flags & VM_MAYWRITE))
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return -EINVAL;
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file_accessed(file);
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vma->vm_ops = &zonefs_file_vm_ops;
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return 0;
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}
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static loff_t zonefs_file_llseek(struct file *file, loff_t offset, int whence)
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{
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loff_t isize = i_size_read(file_inode(file));
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/*
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* Seeks are limited to below the zone size for conventional zones
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* and below the zone write pointer for sequential zones. In both
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* cases, this limit is the inode size.
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*/
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return generic_file_llseek_size(file, offset, whence, isize, isize);
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}
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static int zonefs_file_write_dio_end_io(struct kiocb *iocb, ssize_t size,
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int error, unsigned int flags)
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{
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struct inode *inode = file_inode(iocb->ki_filp);
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struct zonefs_inode_info *zi = ZONEFS_I(inode);
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if (error) {
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zonefs_io_error(inode, true);
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return error;
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}
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if (size && zi->i_ztype != ZONEFS_ZTYPE_CNV) {
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/*
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* Note that we may be seeing completions out of order,
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* but that is not a problem since a write completed
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* successfully necessarily means that all preceding writes
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* were also successful. So we can safely increase the inode
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* size to the write end location.
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*/
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mutex_lock(&zi->i_truncate_mutex);
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if (i_size_read(inode) < iocb->ki_pos + size) {
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zonefs_update_stats(inode, iocb->ki_pos + size);
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zonefs_i_size_write(inode, iocb->ki_pos + size);
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}
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mutex_unlock(&zi->i_truncate_mutex);
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}
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return 0;
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}
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static const struct iomap_dio_ops zonefs_write_dio_ops = {
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.end_io = zonefs_file_write_dio_end_io,
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};
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static ssize_t zonefs_file_dio_append(struct kiocb *iocb, struct iov_iter *from)
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{
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struct inode *inode = file_inode(iocb->ki_filp);
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struct zonefs_inode_info *zi = ZONEFS_I(inode);
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struct block_device *bdev = inode->i_sb->s_bdev;
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unsigned int max = bdev_max_zone_append_sectors(bdev);
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struct bio *bio;
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ssize_t size;
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int nr_pages;
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ssize_t ret;
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max = ALIGN_DOWN(max << SECTOR_SHIFT, inode->i_sb->s_blocksize);
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iov_iter_truncate(from, max);
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nr_pages = iov_iter_npages(from, BIO_MAX_VECS);
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if (!nr_pages)
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return 0;
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bio = bio_alloc(bdev, nr_pages,
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REQ_OP_ZONE_APPEND | REQ_SYNC | REQ_IDLE, GFP_NOFS);
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bio->bi_iter.bi_sector = zi->i_zsector;
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bio->bi_ioprio = iocb->ki_ioprio;
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if (iocb_is_dsync(iocb))
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bio->bi_opf |= REQ_FUA;
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ret = bio_iov_iter_get_pages(bio, from);
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if (unlikely(ret))
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goto out_release;
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size = bio->bi_iter.bi_size;
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task_io_account_write(size);
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if (iocb->ki_flags & IOCB_HIPRI)
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bio_set_polled(bio, iocb);
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ret = submit_bio_wait(bio);
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/*
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* If the file zone was written underneath the file system, the zone
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* write pointer may not be where we expect it to be, but the zone
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* append write can still succeed. So check manually that we wrote where
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* we intended to, that is, at zi->i_wpoffset.
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*/
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if (!ret) {
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sector_t wpsector =
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zi->i_zsector + (zi->i_wpoffset >> SECTOR_SHIFT);
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if (bio->bi_iter.bi_sector != wpsector) {
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zonefs_warn(inode->i_sb,
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"Corrupted write pointer %llu for zone at %llu\n",
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wpsector, zi->i_zsector);
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ret = -EIO;
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}
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}
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zonefs_file_write_dio_end_io(iocb, size, ret, 0);
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trace_zonefs_file_dio_append(inode, size, ret);
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out_release:
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bio_release_pages(bio, false);
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bio_put(bio);
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if (ret >= 0) {
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iocb->ki_pos += size;
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return size;
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}
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return ret;
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}
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/*
|
||||
* 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_write_iomap_ops,
|
||||
&zonefs_write_dio_ops, 0, NULL, 0);
|
||||
if (zi->i_ztype == ZONEFS_ZTYPE_SEQ &&
|
||||
(ret > 0 || ret == -EIOCBQUEUED)) {
|
||||
if (ret > 0)
|
||||
count = ret;
|
||||
|
||||
/*
|
||||
* Update the zone write pointer offset assuming the write
|
||||
* operation succeeded. If it did not, the error recovery path
|
||||
* will correct it. Also do active seq file accounting.
|
||||
*/
|
||||
mutex_lock(&zi->i_truncate_mutex);
|
||||
zi->i_wpoffset += count;
|
||||
zonefs_account_active(inode);
|
||||
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_write_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_read_iomap_ops,
|
||||
&zonefs_read_dio_ops, 0, NULL, 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;
|
||||
}
|
||||
|
||||
/*
|
||||
* Write open accounting is done only for sequential files.
|
||||
*/
|
||||
static inline bool zonefs_seq_file_need_wro(struct inode *inode,
|
||||
struct file *file)
|
||||
{
|
||||
struct zonefs_inode_info *zi = ZONEFS_I(inode);
|
||||
|
||||
if (zi->i_ztype != ZONEFS_ZTYPE_SEQ)
|
||||
return false;
|
||||
|
||||
if (!(file->f_mode & FMODE_WRITE))
|
||||
return false;
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
static int zonefs_seq_file_write_open(struct inode *inode)
|
||||
{
|
||||
struct zonefs_inode_info *zi = ZONEFS_I(inode);
|
||||
int ret = 0;
|
||||
|
||||
mutex_lock(&zi->i_truncate_mutex);
|
||||
|
||||
if (!zi->i_wr_refcnt) {
|
||||
struct zonefs_sb_info *sbi = ZONEFS_SB(inode->i_sb);
|
||||
unsigned int wro = atomic_inc_return(&sbi->s_wro_seq_files);
|
||||
|
||||
if (sbi->s_mount_opts & ZONEFS_MNTOPT_EXPLICIT_OPEN) {
|
||||
|
||||
if (sbi->s_max_wro_seq_files
|
||||
&& wro > sbi->s_max_wro_seq_files) {
|
||||
atomic_dec(&sbi->s_wro_seq_files);
|
||||
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_wro_seq_files);
|
||||
goto unlock;
|
||||
}
|
||||
zi->i_flags |= ZONEFS_ZONE_OPEN;
|
||||
zonefs_account_active(inode);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
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_seq_file_need_wro(inode, file))
|
||||
return zonefs_seq_file_write_open(inode);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void zonefs_seq_file_write_close(struct inode *inode)
|
||||
{
|
||||
struct zonefs_inode_info *zi = ZONEFS_I(inode);
|
||||
struct super_block *sb = inode->i_sb;
|
||||
struct zonefs_sb_info *sbi = ZONEFS_SB(sb);
|
||||
int ret = 0;
|
||||
|
||||
mutex_lock(&zi->i_truncate_mutex);
|
||||
|
||||
zi->i_wr_refcnt--;
|
||||
if (zi->i_wr_refcnt)
|
||||
goto unlock;
|
||||
|
||||
/*
|
||||
* The file zone may not be open anymore (e.g. the file was truncated to
|
||||
* its maximum size or it was fully written). For this case, we only
|
||||
* need to decrement the write open count.
|
||||
*/
|
||||
if (zi->i_flags & ZONEFS_ZONE_OPEN) {
|
||||
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 at %llu failed %d\n",
|
||||
zi->i_zsector, ret);
|
||||
zonefs_warn(sb,
|
||||
"remounting filesystem read-only\n");
|
||||
sb->s_flags |= SB_RDONLY;
|
||||
}
|
||||
goto unlock;
|
||||
}
|
||||
|
||||
zi->i_flags &= ~ZONEFS_ZONE_OPEN;
|
||||
zonefs_account_active(inode);
|
||||
}
|
||||
|
||||
atomic_dec(&sbi->s_wro_seq_files);
|
||||
|
||||
unlock:
|
||||
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_seq_file_need_wro(inode, file))
|
||||
zonefs_seq_file_write_close(inode);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
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 = iocb_bio_iopoll,
|
||||
};
|
||||
File diff suppressed because it is too large
Load Diff
|
|
@ -209,6 +209,28 @@ static inline struct zonefs_sb_info *ZONEFS_SB(struct super_block *sb)
|
|||
#define zonefs_warn(sb, format, args...) \
|
||||
pr_warn("zonefs (%s) WARNING: " format, sb->s_id, ## args)
|
||||
|
||||
/* In super.c */
|
||||
void zonefs_account_active(struct inode *inode);
|
||||
int zonefs_zone_mgmt(struct inode *inode, enum req_op op);
|
||||
void zonefs_i_size_write(struct inode *inode, loff_t isize);
|
||||
void zonefs_update_stats(struct inode *inode, loff_t new_isize);
|
||||
void __zonefs_io_error(struct inode *inode, bool write);
|
||||
|
||||
static inline 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);
|
||||
}
|
||||
|
||||
/* In file.c */
|
||||
extern const struct address_space_operations zonefs_file_aops;
|
||||
extern const struct file_operations zonefs_file_operations;
|
||||
int zonefs_file_truncate(struct inode *inode, loff_t isize);
|
||||
|
||||
/* In sysfs.c */
|
||||
int zonefs_sysfs_register(struct super_block *sb);
|
||||
void zonefs_sysfs_unregister(struct super_block *sb);
|
||||
int zonefs_sysfs_init(void);
|
||||
|
|
|
|||
Loading…
Reference in New Issue