861 lines
22 KiB
C
861 lines
22 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Simple file system for zoned block devices exposing zones as files.
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*
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* Copyright (C) 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 zonefs_zone *z = zonefs_inode_zone(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 = (z->z_sector << 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 zonefs_zone *z = zonefs_inode_zone(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 > z->z_capacity))
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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(zonefs_zone_is_seq(z) && !(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 = (z->z_sector << 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 = z->z_capacity - 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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unsigned int len)
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{
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struct zonefs_zone *z = zonefs_inode_zone(inode);
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if (WARN_ON_ONCE(zonefs_zone_is_seq(z)))
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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,
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z->z_capacity - 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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if (zonefs_inode_is_seq(inode)) {
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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 = iomap_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_folio = generic_error_remove_folio,
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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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struct zonefs_zone *z = zonefs_inode_zone(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 (!zonefs_zone_is_seq(z))
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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 == z->z_capacity)
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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_inode_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 (z->z_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_inode_zone_mgmt(inode, REQ_OP_ZONE_OPEN);
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else
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z->z_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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z->z_wpoffset = isize;
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zonefs_inode_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_inode_is_cnv(inode))
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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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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 (zonefs_inode_is_seq(inode))
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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_inode_is_seq(file_inode(file)) &&
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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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/*
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* For Sync IOs, error recovery is called from
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* zonefs_file_dio_write().
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*/
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if (!is_sync_kiocb(iocb))
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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 && zonefs_inode_is_seq(inode)) {
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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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/*
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* Do not exceed the LFS limits nor the file zone size. If pos is under the
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* limit it becomes a short access. If it exceeds the limit, return -EFBIG.
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*/
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static loff_t zonefs_write_check_limits(struct file *file, loff_t pos,
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loff_t count)
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{
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struct inode *inode = file_inode(file);
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struct zonefs_zone *z = zonefs_inode_zone(inode);
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loff_t limit = rlimit(RLIMIT_FSIZE);
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loff_t max_size = z->z_capacity;
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if (limit != RLIM_INFINITY) {
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if (pos >= limit) {
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send_sig(SIGXFSZ, current, 0);
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return -EFBIG;
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}
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count = min(count, limit - pos);
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}
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if (!(file->f_flags & O_LARGEFILE))
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max_size = min_t(loff_t, MAX_NON_LFS, max_size);
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if (unlikely(pos >= max_size))
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return -EFBIG;
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return min(count, max_size - pos);
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}
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static ssize_t zonefs_write_checks(struct kiocb *iocb, struct iov_iter *from)
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{
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struct file *file = iocb->ki_filp;
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struct inode *inode = file_inode(file);
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struct zonefs_inode_info *zi = ZONEFS_I(inode);
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struct zonefs_zone *z = zonefs_inode_zone(inode);
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loff_t count;
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if (IS_SWAPFILE(inode))
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return -ETXTBSY;
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if (!iov_iter_count(from))
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return 0;
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if ((iocb->ki_flags & IOCB_NOWAIT) && !(iocb->ki_flags & IOCB_DIRECT))
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return -EINVAL;
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if (iocb->ki_flags & IOCB_APPEND) {
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if (zonefs_zone_is_cnv(z))
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return -EINVAL;
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mutex_lock(&zi->i_truncate_mutex);
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iocb->ki_pos = z->z_wpoffset;
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mutex_unlock(&zi->i_truncate_mutex);
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}
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count = zonefs_write_check_limits(file, iocb->ki_pos,
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iov_iter_count(from));
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if (count < 0)
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return count;
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iov_iter_truncate(from, count);
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return iov_iter_count(from);
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}
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/*
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* Handle direct writes. For sequential zone files, this is the only possible
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* write path. For these files, check that the user is issuing writes
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* sequentially from the end of the file. This code assumes that the block layer
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* delivers write requests to the device in sequential order. This is always the
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* case if a block IO scheduler implementing the ELEVATOR_F_ZBD_SEQ_WRITE
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* elevator feature is being used (e.g. mq-deadline). The block layer always
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* automatically select such an elevator for zoned block devices during the
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* device initialization.
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*/
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static ssize_t zonefs_file_dio_write(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 zonefs_zone *z = zonefs_inode_zone(inode);
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struct super_block *sb = inode->i_sb;
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ssize_t ret, count;
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/*
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* For async direct IOs to sequential zone files, refuse IOCB_NOWAIT
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* as this can cause write reordering (e.g. the first aio gets EAGAIN
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* on the inode lock but the second goes through but is now unaligned).
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*/
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if (zonefs_zone_is_seq(z) && !is_sync_kiocb(iocb) &&
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(iocb->ki_flags & IOCB_NOWAIT))
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return -EOPNOTSUPP;
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if (iocb->ki_flags & IOCB_NOWAIT) {
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if (!inode_trylock(inode))
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return -EAGAIN;
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} else {
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inode_lock(inode);
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}
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count = zonefs_write_checks(iocb, from);
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if (count <= 0) {
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ret = count;
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goto inode_unlock;
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}
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if ((iocb->ki_pos | count) & (sb->s_blocksize - 1)) {
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ret = -EINVAL;
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goto inode_unlock;
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}
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/* Enforce sequential writes (append only) in sequential zones */
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if (zonefs_zone_is_seq(z)) {
|
|
mutex_lock(&zi->i_truncate_mutex);
|
|
if (iocb->ki_pos != z->z_wpoffset) {
|
|
mutex_unlock(&zi->i_truncate_mutex);
|
|
ret = -EINVAL;
|
|
goto inode_unlock;
|
|
}
|
|
/*
|
|
* Advance the zone write pointer offset. This assumes that the
|
|
* IO will succeed, which is OK to do because we do not allow
|
|
* partial writes (IOMAP_DIO_PARTIAL is not set) and if the IO
|
|
* fails, the error path will correct the write pointer offset.
|
|
*/
|
|
z->z_wpoffset += count;
|
|
zonefs_inode_account_active(inode);
|
|
mutex_unlock(&zi->i_truncate_mutex);
|
|
}
|
|
|
|
/*
|
|
* iomap_dio_rw() may return ENOTBLK if there was an issue with
|
|
* page invalidation. Overwrite that error code with EBUSY so that
|
|
* the user can make sense of the error.
|
|
*/
|
|
ret = iomap_dio_rw(iocb, from, &zonefs_write_iomap_ops,
|
|
&zonefs_write_dio_ops, 0, NULL, 0);
|
|
if (ret == -ENOTBLK)
|
|
ret = -EBUSY;
|
|
|
|
/*
|
|
* For a failed IO or partial completion, trigger error recovery
|
|
* to update the zone write pointer offset to a correct value.
|
|
* For asynchronous IOs, zonefs_file_write_dio_end_io() may already
|
|
* have executed error recovery if the IO already completed when we
|
|
* reach here. However, we cannot know that and execute error recovery
|
|
* again (that will not change anything).
|
|
*/
|
|
if (zonefs_zone_is_seq(z)) {
|
|
if (ret > 0 && ret != count)
|
|
ret = -EIO;
|
|
if (ret < 0 && ret != -EIOCBQUEUED)
|
|
zonefs_io_error(inode, true);
|
|
}
|
|
|
|
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);
|
|
ssize_t ret;
|
|
|
|
/*
|
|
* Direct IO writes are mandatory for sequential zone files so that the
|
|
* write IO issuing order is preserved.
|
|
*/
|
|
if (zonefs_inode_is_seq(inode))
|
|
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 == -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);
|
|
struct zonefs_zone *z = zonefs_inode_zone(inode);
|
|
|
|
if (unlikely(IS_IMMUTABLE(inode)))
|
|
return -EPERM;
|
|
|
|
if (sb_rdonly(inode->i_sb))
|
|
return -EROFS;
|
|
|
|
/* Write operations beyond the zone capacity are not allowed */
|
|
if (iocb->ki_pos >= z->z_capacity)
|
|
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 zonefs_zone *z = zonefs_inode_zone(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 >= z->z_capacity)
|
|
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;
|
|
}
|
|
|
|
static ssize_t zonefs_file_splice_read(struct file *in, loff_t *ppos,
|
|
struct pipe_inode_info *pipe,
|
|
size_t len, unsigned int flags)
|
|
{
|
|
struct inode *inode = file_inode(in);
|
|
struct zonefs_inode_info *zi = ZONEFS_I(inode);
|
|
struct zonefs_zone *z = zonefs_inode_zone(inode);
|
|
loff_t isize;
|
|
ssize_t ret = 0;
|
|
|
|
/* Offline zones cannot be read */
|
|
if (unlikely(IS_IMMUTABLE(inode) && !(inode->i_mode & 0777)))
|
|
return -EPERM;
|
|
|
|
if (*ppos >= z->z_capacity)
|
|
return 0;
|
|
|
|
inode_lock_shared(inode);
|
|
|
|
/* Limit read operations to written data */
|
|
mutex_lock(&zi->i_truncate_mutex);
|
|
isize = i_size_read(inode);
|
|
if (*ppos >= isize)
|
|
len = 0;
|
|
else
|
|
len = min_t(loff_t, len, isize - *ppos);
|
|
mutex_unlock(&zi->i_truncate_mutex);
|
|
|
|
if (len > 0) {
|
|
ret = filemap_splice_read(in, ppos, pipe, len, flags);
|
|
if (ret == -EIO)
|
|
zonefs_io_error(inode, false);
|
|
}
|
|
|
|
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)
|
|
{
|
|
if (zonefs_inode_is_cnv(inode))
|
|
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);
|
|
struct zonefs_zone *z = zonefs_inode_zone(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) < z->z_capacity) {
|
|
ret = zonefs_inode_zone_mgmt(inode,
|
|
REQ_OP_ZONE_OPEN);
|
|
if (ret) {
|
|
atomic_dec(&sbi->s_wro_seq_files);
|
|
goto unlock;
|
|
}
|
|
z->z_flags |= ZONEFS_ZONE_OPEN;
|
|
zonefs_inode_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;
|
|
|
|
file->f_mode |= FMODE_CAN_ODIRECT;
|
|
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 zonefs_zone *z = zonefs_inode_zone(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 (z->z_flags & ZONEFS_ZONE_OPEN) {
|
|
ret = zonefs_inode_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 (z->z_flags & ZONEFS_ZONE_OPEN &&
|
|
!(sb->s_flags & SB_RDONLY)) {
|
|
zonefs_warn(sb,
|
|
"closing zone at %llu failed %d\n",
|
|
z->z_sector, ret);
|
|
zonefs_warn(sb,
|
|
"remounting filesystem read-only\n");
|
|
sb->s_flags |= SB_RDONLY;
|
|
}
|
|
goto unlock;
|
|
}
|
|
|
|
z->z_flags &= ~ZONEFS_ZONE_OPEN;
|
|
zonefs_inode_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 = zonefs_file_splice_read,
|
|
.splice_write = iter_file_splice_write,
|
|
.iopoll = iocb_bio_iopoll,
|
|
};
|