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![Linus Torvalds](/assets/img/avatar_default.png)
* Reorganize zonefs code to split file related operations to a new fs/zonefs/file.c file. From me. * Modify zonefs to use dynamically allocated inodes and dentries (using the inode and dentry caches) instead of statically allocating everything on mount. This saves a significant amount of memory for very large zoned block devices with 10s of thousands of zones. From me. * Make zonefs_sb_ktype a const struct kobj_type, from Thomas. -----BEGIN PGP SIGNATURE----- iHUEABYKAB0WIQSRPv8tYSvhwAzJdzjdoc3SxdoYdgUCY/VokQAKCRDdoc3SxdoY dgCVAP427Q2wBrphU1//iW6R/7OZMz24nwmJcYPBAVLTngQO5gD+IVX+ru4xhD4Q W1VKFN9QIDbjEiEc+Lmt9iQuDz+roAI= =e/FD -----END PGP SIGNATURE----- Merge tag 'zonefs-6.3-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/dlemoal/zonefs Pull zonefs updates from Damien Le Moal: - Reorganize zonefs code to split file related operations to a new fs/zonefs/file.c file (me) - Modify zonefs to use dynamically allocated inodes and dentries (using the inode and dentry caches) instead of statically allocating everything on mount. This saves a significant amount of memory for very large zoned block devices with 10s of thousands of zones (me) - Make zonefs_sb_ktype a const struct kobj_type (Thomas) * tag 'zonefs-6.3-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/dlemoal/zonefs: zonefs: make kobj_type structure constant zonefs: Cache zone group directory inodes zonefs: Dynamically create file inodes when needed zonefs: Separate zone information from inode information zonefs: Reduce struct zonefs_inode_info size zonefs: Simplify IO error handling zonefs: Reorganize code
1449 lines
37 KiB
C
1449 lines
37 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Simple file system for zoned block devices exposing zones as files.
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*
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* Copyright (C) 2019 Western Digital Corporation or its affiliates.
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*/
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#include <linux/module.h>
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#include <linux/pagemap.h>
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#include <linux/magic.h>
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#include <linux/iomap.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/blkdev.h>
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#include <linux/statfs.h>
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#include <linux/writeback.h>
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#include <linux/quotaops.h>
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#include <linux/seq_file.h>
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#include <linux/parser.h>
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#include <linux/uio.h>
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#include <linux/mman.h>
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#include <linux/sched/mm.h>
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#include <linux/crc32.h>
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#include <linux/task_io_accounting_ops.h>
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#include "zonefs.h"
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#define CREATE_TRACE_POINTS
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#include "trace.h"
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/*
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* Get the name of a zone group directory.
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*/
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static const char *zonefs_zgroup_name(enum zonefs_ztype ztype)
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{
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switch (ztype) {
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case ZONEFS_ZTYPE_CNV:
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return "cnv";
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case ZONEFS_ZTYPE_SEQ:
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return "seq";
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default:
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WARN_ON_ONCE(1);
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return "???";
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}
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}
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/*
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* Manage the active zone count.
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*/
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static void zonefs_account_active(struct super_block *sb,
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struct zonefs_zone *z)
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{
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struct zonefs_sb_info *sbi = ZONEFS_SB(sb);
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if (zonefs_zone_is_cnv(z))
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return;
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/*
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* For zones that transitioned to the offline or readonly condition,
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* we only need to clear the active state.
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*/
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if (z->z_flags & (ZONEFS_ZONE_OFFLINE | ZONEFS_ZONE_READONLY))
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goto out;
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/*
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* If the zone is active, that is, if it is explicitly open or
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* partially written, check if it was already accounted as active.
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*/
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if ((z->z_flags & ZONEFS_ZONE_OPEN) ||
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(z->z_wpoffset > 0 && z->z_wpoffset < z->z_capacity)) {
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if (!(z->z_flags & ZONEFS_ZONE_ACTIVE)) {
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z->z_flags |= ZONEFS_ZONE_ACTIVE;
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atomic_inc(&sbi->s_active_seq_files);
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}
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return;
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}
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out:
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/* The zone is not active. If it was, update the active count */
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if (z->z_flags & ZONEFS_ZONE_ACTIVE) {
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z->z_flags &= ~ZONEFS_ZONE_ACTIVE;
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atomic_dec(&sbi->s_active_seq_files);
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}
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}
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/*
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* Manage the active zone count. Called with zi->i_truncate_mutex held.
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*/
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void zonefs_inode_account_active(struct inode *inode)
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{
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lockdep_assert_held(&ZONEFS_I(inode)->i_truncate_mutex);
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return zonefs_account_active(inode->i_sb, zonefs_inode_zone(inode));
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}
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/*
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* Execute a zone management operation.
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*/
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static int zonefs_zone_mgmt(struct super_block *sb,
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struct zonefs_zone *z, enum req_op op)
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{
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int ret;
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/*
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* With ZNS drives, closing an explicitly open zone that has not been
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* written will change the zone state to "closed", that is, the zone
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* will remain active. Since this can then cause failure of explicit
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* open operation on other zones if the drive active zone resources
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* are exceeded, make sure that the zone does not remain active by
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* resetting it.
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*/
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if (op == REQ_OP_ZONE_CLOSE && !z->z_wpoffset)
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op = REQ_OP_ZONE_RESET;
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trace_zonefs_zone_mgmt(sb, z, op);
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ret = blkdev_zone_mgmt(sb->s_bdev, op, z->z_sector,
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z->z_size >> SECTOR_SHIFT, GFP_NOFS);
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if (ret) {
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zonefs_err(sb,
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"Zone management operation %s at %llu failed %d\n",
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blk_op_str(op), z->z_sector, ret);
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return ret;
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}
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return 0;
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}
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int zonefs_inode_zone_mgmt(struct inode *inode, enum req_op op)
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{
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lockdep_assert_held(&ZONEFS_I(inode)->i_truncate_mutex);
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return zonefs_zone_mgmt(inode->i_sb, zonefs_inode_zone(inode), op);
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}
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void zonefs_i_size_write(struct inode *inode, loff_t isize)
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{
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struct zonefs_zone *z = zonefs_inode_zone(inode);
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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 >= z->z_capacity) {
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struct zonefs_sb_info *sbi = ZONEFS_SB(inode->i_sb);
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if (z->z_flags & ZONEFS_ZONE_ACTIVE)
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atomic_dec(&sbi->s_active_seq_files);
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z->z_flags &= ~(ZONEFS_ZONE_OPEN | ZONEFS_ZONE_ACTIVE);
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}
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}
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void zonefs_update_stats(struct inode *inode, loff_t new_isize)
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{
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struct super_block *sb = inode->i_sb;
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struct zonefs_sb_info *sbi = ZONEFS_SB(sb);
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loff_t old_isize = i_size_read(inode);
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loff_t nr_blocks;
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if (new_isize == old_isize)
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return;
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spin_lock(&sbi->s_lock);
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/*
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* This may be called for an update after an IO error.
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* So beware of the values seen.
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*/
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if (new_isize < old_isize) {
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nr_blocks = (old_isize - new_isize) >> sb->s_blocksize_bits;
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if (sbi->s_used_blocks > nr_blocks)
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sbi->s_used_blocks -= nr_blocks;
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else
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sbi->s_used_blocks = 0;
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} else {
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sbi->s_used_blocks +=
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(new_isize - old_isize) >> sb->s_blocksize_bits;
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if (sbi->s_used_blocks > sbi->s_blocks)
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sbi->s_used_blocks = sbi->s_blocks;
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}
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spin_unlock(&sbi->s_lock);
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}
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/*
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* Check a zone condition. Return the amount of written (and still readable)
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* data in the zone.
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*/
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static loff_t zonefs_check_zone_condition(struct super_block *sb,
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struct zonefs_zone *z,
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struct blk_zone *zone)
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{
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switch (zone->cond) {
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case BLK_ZONE_COND_OFFLINE:
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zonefs_warn(sb, "Zone %llu: offline zone\n",
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z->z_sector);
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z->z_flags |= ZONEFS_ZONE_OFFLINE;
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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, so we cannot
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* determine the zone wpoffset (inode size). We thus keep the
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* zone wpoffset as is, which leads to an empty file
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* (wpoffset == 0) on mount. For a runtime error, this keeps
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* the inode size as it was when last updated so that the user
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* can recover data.
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*/
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zonefs_warn(sb, "Zone %llu: read-only zone\n",
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z->z_sector);
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z->z_flags |= ZONEFS_ZONE_READONLY;
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if (zonefs_zone_is_cnv(z))
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return z->z_capacity;
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return z->z_wpoffset;
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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 z->z_capacity;
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default:
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if (zonefs_zone_is_cnv(z))
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return z->z_capacity;
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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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* Check a zone condition and adjust its inode access permissions for
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* offline and readonly zones.
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*/
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static void zonefs_inode_update_mode(struct inode *inode)
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{
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struct zonefs_zone *z = zonefs_inode_zone(inode);
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if (z->z_flags & ZONEFS_ZONE_OFFLINE) {
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/* Offline zones cannot be read nor written */
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inode->i_flags |= S_IMMUTABLE;
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inode->i_mode &= ~0777;
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} else if (z->z_flags & ZONEFS_ZONE_READONLY) {
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/* Readonly zones cannot be written */
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inode->i_flags |= S_IMMUTABLE;
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if (z->z_flags & ZONEFS_ZONE_INIT_MODE)
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inode->i_mode &= ~0777;
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else
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inode->i_mode &= ~0222;
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}
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z->z_flags &= ~ZONEFS_ZONE_INIT_MODE;
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z->z_mode = inode->i_mode;
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}
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struct zonefs_ioerr_data {
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struct inode *inode;
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bool write;
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};
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static int zonefs_io_error_cb(struct blk_zone *zone, unsigned int idx,
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void *data)
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{
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struct zonefs_ioerr_data *err = data;
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struct inode *inode = err->inode;
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struct zonefs_zone *z = zonefs_inode_zone(inode);
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struct super_block *sb = inode->i_sb;
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struct zonefs_sb_info *sbi = ZONEFS_SB(sb);
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loff_t isize, data_size;
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/*
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* Check the zone condition: if the zone is not "bad" (offline or
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* read-only), read errors are simply signaled to the IO issuer as long
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* as there is no inconsistency between the inode size and the amount of
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* data writen in the zone (data_size).
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*/
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data_size = zonefs_check_zone_condition(sb, z, zone);
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isize = i_size_read(inode);
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if (!(z->z_flags & (ZONEFS_ZONE_READONLY | ZONEFS_ZONE_OFFLINE)) &&
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!err->write && isize == data_size)
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return 0;
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/*
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* At this point, we detected either a bad zone or an inconsistency
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* between the inode size and the amount of data written in the zone.
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* For the latter case, the cause may be a write IO error or an external
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* action on the device. Two error patterns exist:
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* 1) The inode size is lower than the amount of data in the zone:
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* a write operation partially failed and data was writen at the end
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* of the file. This can happen in the case of a large direct IO
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* needing several BIOs and/or write requests to be processed.
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* 2) The inode size is larger than the amount of data in the zone:
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* this can happen with a deferred write error with the use of the
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* device side write cache after getting successful write IO
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* completions. Other possibilities are (a) an external corruption,
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* e.g. an application reset the zone directly, or (b) the device
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* has a serious problem (e.g. firmware bug).
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*
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* In all cases, warn about inode size inconsistency and handle the
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* IO error according to the zone condition and to the mount options.
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*/
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if (zonefs_zone_is_seq(z) && isize != data_size)
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zonefs_warn(sb,
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"inode %lu: invalid size %lld (should be %lld)\n",
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inode->i_ino, isize, data_size);
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/*
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* First handle bad zones signaled by hardware. The mount options
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* errors=zone-ro and errors=zone-offline result in changing the
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* zone condition to read-only and offline respectively, as if the
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* condition was signaled by the hardware.
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*/
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if ((z->z_flags & ZONEFS_ZONE_OFFLINE) ||
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(sbi->s_mount_opts & ZONEFS_MNTOPT_ERRORS_ZOL)) {
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zonefs_warn(sb, "inode %lu: read/write access disabled\n",
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inode->i_ino);
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if (!(z->z_flags & ZONEFS_ZONE_OFFLINE))
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z->z_flags |= ZONEFS_ZONE_OFFLINE;
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zonefs_inode_update_mode(inode);
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data_size = 0;
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} else if ((z->z_flags & ZONEFS_ZONE_READONLY) ||
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(sbi->s_mount_opts & ZONEFS_MNTOPT_ERRORS_ZRO)) {
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zonefs_warn(sb, "inode %lu: write access disabled\n",
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inode->i_ino);
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if (!(z->z_flags & ZONEFS_ZONE_READONLY))
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z->z_flags |= ZONEFS_ZONE_READONLY;
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zonefs_inode_update_mode(inode);
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data_size = isize;
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} else if (sbi->s_mount_opts & ZONEFS_MNTOPT_ERRORS_RO &&
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data_size > isize) {
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/* Do not expose garbage data */
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data_size = isize;
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}
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/*
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* If the filesystem is mounted with the explicit-open mount option, we
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* need to clear the ZONEFS_ZONE_OPEN flag if the zone transitioned to
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* the read-only or offline condition, to avoid attempting an explicit
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* close of the zone when the inode file is closed.
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*/
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if ((sbi->s_mount_opts & ZONEFS_MNTOPT_EXPLICIT_OPEN) &&
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(z->z_flags & (ZONEFS_ZONE_READONLY | ZONEFS_ZONE_OFFLINE)))
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z->z_flags &= ~ZONEFS_ZONE_OPEN;
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/*
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* If error=remount-ro was specified, any error result in remounting
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* the volume as read-only.
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*/
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if ((sbi->s_mount_opts & ZONEFS_MNTOPT_ERRORS_RO) && !sb_rdonly(sb)) {
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zonefs_warn(sb, "remounting filesystem read-only\n");
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sb->s_flags |= SB_RDONLY;
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}
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/*
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* Update block usage stats and the inode size to prevent access to
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* invalid data.
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*/
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zonefs_update_stats(inode, data_size);
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zonefs_i_size_write(inode, data_size);
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z->z_wpoffset = data_size;
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zonefs_inode_account_active(inode);
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return 0;
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}
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/*
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* When an file IO error occurs, check the file zone to see if there is a change
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* in the zone condition (e.g. offline or read-only). For a failed write to a
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* sequential zone, the zone write pointer position must also be checked to
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* eventually correct the file size and zonefs inode write pointer offset
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* (which can be out of sync with the drive due to partial write failures).
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*/
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void __zonefs_io_error(struct inode *inode, bool write)
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{
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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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struct zonefs_sb_info *sbi = ZONEFS_SB(sb);
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unsigned int noio_flag;
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unsigned int nr_zones = 1;
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struct zonefs_ioerr_data err = {
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.inode = inode,
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.write = write,
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};
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int ret;
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/*
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* The only files that have more than one zone are conventional zone
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* files with aggregated conventional zones, for which the inode zone
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* size is always larger than the device zone size.
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*/
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if (z->z_size > bdev_zone_sectors(sb->s_bdev))
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nr_zones = z->z_size >>
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(sbi->s_zone_sectors_shift + SECTOR_SHIFT);
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/*
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* Memory allocations in blkdev_report_zones() can trigger a memory
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* reclaim which may in turn cause a recursion into zonefs as well as
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* struct request allocations for the same device. The former case may
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* end up in a deadlock on the inode truncate mutex, while the latter
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* may prevent IO forward progress. Executing the report zones under
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* the GFP_NOIO context avoids both problems.
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*/
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noio_flag = memalloc_noio_save();
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ret = blkdev_report_zones(sb->s_bdev, z->z_sector, nr_zones,
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zonefs_io_error_cb, &err);
|
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if (ret != nr_zones)
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zonefs_err(sb, "Get inode %lu zone information failed %d\n",
|
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inode->i_ino, ret);
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memalloc_noio_restore(noio_flag);
|
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}
|
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|
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static struct kmem_cache *zonefs_inode_cachep;
|
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|
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static struct inode *zonefs_alloc_inode(struct super_block *sb)
|
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{
|
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struct zonefs_inode_info *zi;
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|
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zi = alloc_inode_sb(sb, zonefs_inode_cachep, GFP_KERNEL);
|
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if (!zi)
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return NULL;
|
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|
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inode_init_once(&zi->i_vnode);
|
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mutex_init(&zi->i_truncate_mutex);
|
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zi->i_wr_refcnt = 0;
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|
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return &zi->i_vnode;
|
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}
|
|
|
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static void zonefs_free_inode(struct inode *inode)
|
|
{
|
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kmem_cache_free(zonefs_inode_cachep, ZONEFS_I(inode));
|
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}
|
|
|
|
/*
|
|
* File system stat.
|
|
*/
|
|
static int zonefs_statfs(struct dentry *dentry, struct kstatfs *buf)
|
|
{
|
|
struct super_block *sb = dentry->d_sb;
|
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struct zonefs_sb_info *sbi = ZONEFS_SB(sb);
|
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enum zonefs_ztype t;
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|
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buf->f_type = ZONEFS_MAGIC;
|
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buf->f_bsize = sb->s_blocksize;
|
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buf->f_namelen = ZONEFS_NAME_MAX;
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|
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spin_lock(&sbi->s_lock);
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|
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buf->f_blocks = sbi->s_blocks;
|
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if (WARN_ON(sbi->s_used_blocks > sbi->s_blocks))
|
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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_zgroup[t].g_nr_zones)
|
|
buf->f_files += sbi->s_zgroup[t].g_nr_zones + 1;
|
|
}
|
|
buf->f_ffree = 0;
|
|
|
|
spin_unlock(&sbi->s_lock);
|
|
|
|
buf->f_fsid = uuid_to_fsid(sbi->s_uuid.b);
|
|
|
|
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 int zonefs_inode_setattr(struct mnt_idmap *idmap,
|
|
struct dentry *dentry, struct iattr *iattr)
|
|
{
|
|
struct inode *inode = d_inode(dentry);
|
|
int ret;
|
|
|
|
if (unlikely(IS_IMMUTABLE(inode)))
|
|
return -EPERM;
|
|
|
|
ret = setattr_prepare(&nop_mnt_idmap, 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(&nop_mnt_idmap, 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(&nop_mnt_idmap, inode, iattr);
|
|
|
|
if (S_ISREG(inode->i_mode)) {
|
|
struct zonefs_zone *z = zonefs_inode_zone(inode);
|
|
|
|
z->z_mode = inode->i_mode;
|
|
z->z_uid = inode->i_uid;
|
|
z->z_gid = inode->i_gid;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct inode_operations zonefs_file_inode_operations = {
|
|
.setattr = zonefs_inode_setattr,
|
|
};
|
|
|
|
static long zonefs_fname_to_fno(const struct qstr *fname)
|
|
{
|
|
const char *name = fname->name;
|
|
unsigned int len = fname->len;
|
|
long fno = 0, shift = 1;
|
|
const char *rname;
|
|
char c = *name;
|
|
unsigned int i;
|
|
|
|
/*
|
|
* File names are always a base-10 number string without any
|
|
* leading 0s.
|
|
*/
|
|
if (!isdigit(c))
|
|
return -ENOENT;
|
|
|
|
if (len > 1 && c == '0')
|
|
return -ENOENT;
|
|
|
|
if (len == 1)
|
|
return c - '0';
|
|
|
|
for (i = 0, rname = name + len - 1; i < len; i++, rname--) {
|
|
c = *rname;
|
|
if (!isdigit(c))
|
|
return -ENOENT;
|
|
fno += (c - '0') * shift;
|
|
shift *= 10;
|
|
}
|
|
|
|
return fno;
|
|
}
|
|
|
|
static struct inode *zonefs_get_file_inode(struct inode *dir,
|
|
struct dentry *dentry)
|
|
{
|
|
struct zonefs_zone_group *zgroup = dir->i_private;
|
|
struct super_block *sb = dir->i_sb;
|
|
struct zonefs_sb_info *sbi = ZONEFS_SB(sb);
|
|
struct zonefs_zone *z;
|
|
struct inode *inode;
|
|
ino_t ino;
|
|
long fno;
|
|
|
|
/* Get the file number from the file name */
|
|
fno = zonefs_fname_to_fno(&dentry->d_name);
|
|
if (fno < 0)
|
|
return ERR_PTR(fno);
|
|
|
|
if (!zgroup->g_nr_zones || fno >= zgroup->g_nr_zones)
|
|
return ERR_PTR(-ENOENT);
|
|
|
|
z = &zgroup->g_zones[fno];
|
|
ino = z->z_sector >> sbi->s_zone_sectors_shift;
|
|
inode = iget_locked(sb, ino);
|
|
if (!inode)
|
|
return ERR_PTR(-ENOMEM);
|
|
if (!(inode->i_state & I_NEW)) {
|
|
WARN_ON_ONCE(inode->i_private != z);
|
|
return inode;
|
|
}
|
|
|
|
inode->i_ino = ino;
|
|
inode->i_mode = z->z_mode;
|
|
inode->i_ctime = inode->i_mtime = inode->i_atime = dir->i_ctime;
|
|
inode->i_uid = z->z_uid;
|
|
inode->i_gid = z->z_gid;
|
|
inode->i_size = z->z_wpoffset;
|
|
inode->i_blocks = z->z_capacity >> SECTOR_SHIFT;
|
|
inode->i_private = z;
|
|
|
|
inode->i_op = &zonefs_file_inode_operations;
|
|
inode->i_fop = &zonefs_file_operations;
|
|
inode->i_mapping->a_ops = &zonefs_file_aops;
|
|
|
|
/* Update the inode access rights depending on the zone condition */
|
|
zonefs_inode_update_mode(inode);
|
|
|
|
unlock_new_inode(inode);
|
|
|
|
return inode;
|
|
}
|
|
|
|
static struct inode *zonefs_get_zgroup_inode(struct super_block *sb,
|
|
enum zonefs_ztype ztype)
|
|
{
|
|
struct inode *root = d_inode(sb->s_root);
|
|
struct zonefs_sb_info *sbi = ZONEFS_SB(sb);
|
|
struct inode *inode;
|
|
ino_t ino = bdev_nr_zones(sb->s_bdev) + ztype + 1;
|
|
|
|
inode = iget_locked(sb, ino);
|
|
if (!inode)
|
|
return ERR_PTR(-ENOMEM);
|
|
if (!(inode->i_state & I_NEW))
|
|
return inode;
|
|
|
|
inode->i_ino = ino;
|
|
inode_init_owner(&nop_mnt_idmap, inode, root, S_IFDIR | 0555);
|
|
inode->i_size = sbi->s_zgroup[ztype].g_nr_zones;
|
|
inode->i_ctime = inode->i_mtime = inode->i_atime = root->i_ctime;
|
|
inode->i_private = &sbi->s_zgroup[ztype];
|
|
set_nlink(inode, 2);
|
|
|
|
inode->i_op = &zonefs_dir_inode_operations;
|
|
inode->i_fop = &zonefs_dir_operations;
|
|
|
|
unlock_new_inode(inode);
|
|
|
|
return inode;
|
|
}
|
|
|
|
|
|
static struct inode *zonefs_get_dir_inode(struct inode *dir,
|
|
struct dentry *dentry)
|
|
{
|
|
struct super_block *sb = dir->i_sb;
|
|
struct zonefs_sb_info *sbi = ZONEFS_SB(sb);
|
|
const char *name = dentry->d_name.name;
|
|
enum zonefs_ztype ztype;
|
|
|
|
/*
|
|
* We only need to check for the "seq" directory and
|
|
* the "cnv" directory if we have conventional zones.
|
|
*/
|
|
if (dentry->d_name.len != 3)
|
|
return ERR_PTR(-ENOENT);
|
|
|
|
for (ztype = 0; ztype < ZONEFS_ZTYPE_MAX; ztype++) {
|
|
if (sbi->s_zgroup[ztype].g_nr_zones &&
|
|
memcmp(name, zonefs_zgroup_name(ztype), 3) == 0)
|
|
break;
|
|
}
|
|
if (ztype == ZONEFS_ZTYPE_MAX)
|
|
return ERR_PTR(-ENOENT);
|
|
|
|
return zonefs_get_zgroup_inode(sb, ztype);
|
|
}
|
|
|
|
static struct dentry *zonefs_lookup(struct inode *dir, struct dentry *dentry,
|
|
unsigned int flags)
|
|
{
|
|
struct inode *inode;
|
|
|
|
if (dentry->d_name.len > ZONEFS_NAME_MAX)
|
|
return ERR_PTR(-ENAMETOOLONG);
|
|
|
|
if (dir == d_inode(dir->i_sb->s_root))
|
|
inode = zonefs_get_dir_inode(dir, dentry);
|
|
else
|
|
inode = zonefs_get_file_inode(dir, dentry);
|
|
if (IS_ERR(inode))
|
|
return ERR_CAST(inode);
|
|
|
|
return d_splice_alias(inode, dentry);
|
|
}
|
|
|
|
static int zonefs_readdir_root(struct file *file, struct dir_context *ctx)
|
|
{
|
|
struct inode *inode = file_inode(file);
|
|
struct super_block *sb = inode->i_sb;
|
|
struct zonefs_sb_info *sbi = ZONEFS_SB(sb);
|
|
enum zonefs_ztype ztype = ZONEFS_ZTYPE_CNV;
|
|
ino_t base_ino = bdev_nr_zones(sb->s_bdev) + 1;
|
|
|
|
if (ctx->pos >= inode->i_size)
|
|
return 0;
|
|
|
|
if (!dir_emit_dots(file, ctx))
|
|
return 0;
|
|
|
|
if (ctx->pos == 2) {
|
|
if (!sbi->s_zgroup[ZONEFS_ZTYPE_CNV].g_nr_zones)
|
|
ztype = ZONEFS_ZTYPE_SEQ;
|
|
|
|
if (!dir_emit(ctx, zonefs_zgroup_name(ztype), 3,
|
|
base_ino + ztype, DT_DIR))
|
|
return 0;
|
|
ctx->pos++;
|
|
}
|
|
|
|
if (ctx->pos == 3 && ztype != ZONEFS_ZTYPE_SEQ) {
|
|
ztype = ZONEFS_ZTYPE_SEQ;
|
|
if (!dir_emit(ctx, zonefs_zgroup_name(ztype), 3,
|
|
base_ino + ztype, DT_DIR))
|
|
return 0;
|
|
ctx->pos++;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int zonefs_readdir_zgroup(struct file *file,
|
|
struct dir_context *ctx)
|
|
{
|
|
struct inode *inode = file_inode(file);
|
|
struct zonefs_zone_group *zgroup = inode->i_private;
|
|
struct super_block *sb = inode->i_sb;
|
|
struct zonefs_sb_info *sbi = ZONEFS_SB(sb);
|
|
struct zonefs_zone *z;
|
|
int fname_len;
|
|
char *fname;
|
|
ino_t ino;
|
|
int f;
|
|
|
|
/*
|
|
* The size of zone group directories is equal to the number
|
|
* of zone files in the group and does note include the "." and
|
|
* ".." entries. Hence the "+ 2" here.
|
|
*/
|
|
if (ctx->pos >= inode->i_size + 2)
|
|
return 0;
|
|
|
|
if (!dir_emit_dots(file, ctx))
|
|
return 0;
|
|
|
|
fname = kmalloc(ZONEFS_NAME_MAX, GFP_KERNEL);
|
|
if (!fname)
|
|
return -ENOMEM;
|
|
|
|
for (f = ctx->pos - 2; f < zgroup->g_nr_zones; f++) {
|
|
z = &zgroup->g_zones[f];
|
|
ino = z->z_sector >> sbi->s_zone_sectors_shift;
|
|
fname_len = snprintf(fname, ZONEFS_NAME_MAX - 1, "%u", f);
|
|
if (!dir_emit(ctx, fname, fname_len, ino, DT_REG))
|
|
break;
|
|
ctx->pos++;
|
|
}
|
|
|
|
kfree(fname);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int zonefs_readdir(struct file *file, struct dir_context *ctx)
|
|
{
|
|
struct inode *inode = file_inode(file);
|
|
|
|
if (inode == d_inode(inode->i_sb->s_root))
|
|
return zonefs_readdir_root(file, ctx);
|
|
|
|
return zonefs_readdir_zgroup(file, ctx);
|
|
}
|
|
|
|
const struct inode_operations zonefs_dir_inode_operations = {
|
|
.lookup = zonefs_lookup,
|
|
.setattr = zonefs_inode_setattr,
|
|
};
|
|
|
|
const struct file_operations zonefs_dir_operations = {
|
|
.llseek = generic_file_llseek,
|
|
.read = generic_read_dir,
|
|
.iterate_shared = zonefs_readdir,
|
|
};
|
|
|
|
struct zonefs_zone_data {
|
|
struct super_block *sb;
|
|
unsigned int nr_zones[ZONEFS_ZTYPE_MAX];
|
|
sector_t cnv_zone_start;
|
|
struct blk_zone *zones;
|
|
};
|
|
|
|
static int zonefs_get_zone_info_cb(struct blk_zone *zone, unsigned int idx,
|
|
void *data)
|
|
{
|
|
struct zonefs_zone_data *zd = data;
|
|
struct super_block *sb = zd->sb;
|
|
struct zonefs_sb_info *sbi = ZONEFS_SB(sb);
|
|
|
|
/*
|
|
* We do not care about the first zone: it contains the super block
|
|
* and not exposed as a file.
|
|
*/
|
|
if (!idx)
|
|
return 0;
|
|
|
|
/*
|
|
* Count the number of zones that will be exposed as files.
|
|
* For sequential zones, we always have as many files as zones.
|
|
* FOr conventional zones, the number of files depends on if we have
|
|
* conventional zones aggregation enabled.
|
|
*/
|
|
switch (zone->type) {
|
|
case BLK_ZONE_TYPE_CONVENTIONAL:
|
|
if (sbi->s_features & ZONEFS_F_AGGRCNV) {
|
|
/* One file per set of contiguous conventional zones */
|
|
if (!(sbi->s_zgroup[ZONEFS_ZTYPE_CNV].g_nr_zones) ||
|
|
zone->start != zd->cnv_zone_start)
|
|
sbi->s_zgroup[ZONEFS_ZTYPE_CNV].g_nr_zones++;
|
|
zd->cnv_zone_start = zone->start + zone->len;
|
|
} else {
|
|
/* One file per zone */
|
|
sbi->s_zgroup[ZONEFS_ZTYPE_CNV].g_nr_zones++;
|
|
}
|
|
break;
|
|
case BLK_ZONE_TYPE_SEQWRITE_REQ:
|
|
case BLK_ZONE_TYPE_SEQWRITE_PREF:
|
|
sbi->s_zgroup[ZONEFS_ZTYPE_SEQ].g_nr_zones++;
|
|
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(bdev_nr_zones(bdev), 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 != bdev_nr_zones(bdev)) {
|
|
zonefs_err(zd->sb, "Invalid zone report (%d/%u zones)\n",
|
|
ret, bdev_nr_zones(bdev));
|
|
return -EIO;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline void zonefs_free_zone_info(struct zonefs_zone_data *zd)
|
|
{
|
|
kvfree(zd->zones);
|
|
}
|
|
|
|
/*
|
|
* Create a zone group and populate it with zone files.
|
|
*/
|
|
static int zonefs_init_zgroup(struct super_block *sb,
|
|
struct zonefs_zone_data *zd,
|
|
enum zonefs_ztype ztype)
|
|
{
|
|
struct zonefs_sb_info *sbi = ZONEFS_SB(sb);
|
|
struct zonefs_zone_group *zgroup = &sbi->s_zgroup[ztype];
|
|
struct blk_zone *zone, *next, *end;
|
|
struct zonefs_zone *z;
|
|
unsigned int n = 0;
|
|
int ret;
|
|
|
|
/* Allocate the zone group. If it is empty, we have nothing to do. */
|
|
if (!zgroup->g_nr_zones)
|
|
return 0;
|
|
|
|
zgroup->g_zones = kvcalloc(zgroup->g_nr_zones,
|
|
sizeof(struct zonefs_zone), GFP_KERNEL);
|
|
if (!zgroup->g_zones)
|
|
return -ENOMEM;
|
|
|
|
/*
|
|
* Initialize the zone groups using the device zone information.
|
|
* We always skip the first zone as it contains the super block
|
|
* and is not use to back a file.
|
|
*/
|
|
end = zd->zones + bdev_nr_zones(sb->s_bdev);
|
|
for (zone = &zd->zones[1]; zone < end; zone = next) {
|
|
|
|
next = zone + 1;
|
|
if (zonefs_zone_type(zone) != ztype)
|
|
continue;
|
|
|
|
if (WARN_ON_ONCE(n >= zgroup->g_nr_zones))
|
|
return -EINVAL;
|
|
|
|
/*
|
|
* 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 (ztype == ZONEFS_ZTYPE_CNV &&
|
|
(sbi->s_features & ZONEFS_F_AGGRCNV)) {
|
|
for (; next < end; next++) {
|
|
if (zonefs_zone_type(next) != ztype)
|
|
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;
|
|
}
|
|
}
|
|
|
|
z = &zgroup->g_zones[n];
|
|
if (ztype == ZONEFS_ZTYPE_CNV)
|
|
z->z_flags |= ZONEFS_ZONE_CNV;
|
|
z->z_sector = zone->start;
|
|
z->z_size = zone->len << SECTOR_SHIFT;
|
|
if (z->z_size > bdev_zone_sectors(sb->s_bdev) << SECTOR_SHIFT &&
|
|
!(sbi->s_features & ZONEFS_F_AGGRCNV)) {
|
|
zonefs_err(sb,
|
|
"Invalid zone size %llu (device zone sectors %llu)\n",
|
|
z->z_size,
|
|
bdev_zone_sectors(sb->s_bdev) << SECTOR_SHIFT);
|
|
return -EINVAL;
|
|
}
|
|
|
|
z->z_capacity = min_t(loff_t, MAX_LFS_FILESIZE,
|
|
zone->capacity << SECTOR_SHIFT);
|
|
z->z_wpoffset = zonefs_check_zone_condition(sb, z, zone);
|
|
|
|
z->z_mode = S_IFREG | sbi->s_perm;
|
|
z->z_uid = sbi->s_uid;
|
|
z->z_gid = sbi->s_gid;
|
|
|
|
/*
|
|
* Let zonefs_inode_update_mode() know that we will need
|
|
* special initialization of the inode mode the first time
|
|
* it is accessed.
|
|
*/
|
|
z->z_flags |= ZONEFS_ZONE_INIT_MODE;
|
|
|
|
sb->s_maxbytes = max(z->z_capacity, sb->s_maxbytes);
|
|
sbi->s_blocks += z->z_capacity >> sb->s_blocksize_bits;
|
|
sbi->s_used_blocks += z->z_wpoffset >> sb->s_blocksize_bits;
|
|
|
|
/*
|
|
* For sequential zones, make sure that any open zone is closed
|
|
* first to ensure that the initial number of open zones is 0,
|
|
* in sync with the open zone accounting done when the mount
|
|
* option ZONEFS_MNTOPT_EXPLICIT_OPEN is used.
|
|
*/
|
|
if (ztype == ZONEFS_ZTYPE_SEQ &&
|
|
(zone->cond == BLK_ZONE_COND_IMP_OPEN ||
|
|
zone->cond == BLK_ZONE_COND_EXP_OPEN)) {
|
|
ret = zonefs_zone_mgmt(sb, z, REQ_OP_ZONE_CLOSE);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
zonefs_account_active(sb, z);
|
|
|
|
n++;
|
|
}
|
|
|
|
if (WARN_ON_ONCE(n != zgroup->g_nr_zones))
|
|
return -EINVAL;
|
|
|
|
zonefs_info(sb, "Zone group \"%s\" has %u file%s\n",
|
|
zonefs_zgroup_name(ztype),
|
|
zgroup->g_nr_zones,
|
|
zgroup->g_nr_zones > 1 ? "s" : "");
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void zonefs_free_zgroups(struct super_block *sb)
|
|
{
|
|
struct zonefs_sb_info *sbi = ZONEFS_SB(sb);
|
|
enum zonefs_ztype ztype;
|
|
|
|
if (!sbi)
|
|
return;
|
|
|
|
for (ztype = 0; ztype < ZONEFS_ZTYPE_MAX; ztype++) {
|
|
kvfree(sbi->s_zgroup[ztype].g_zones);
|
|
sbi->s_zgroup[ztype].g_zones = NULL;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Create a zone group and populate it with zone files.
|
|
*/
|
|
static int zonefs_init_zgroups(struct super_block *sb)
|
|
{
|
|
struct zonefs_zone_data zd;
|
|
enum zonefs_ztype ztype;
|
|
int ret;
|
|
|
|
/* First get the device zone information */
|
|
memset(&zd, 0, sizeof(struct zonefs_zone_data));
|
|
zd.sb = sb;
|
|
ret = zonefs_get_zone_info(&zd);
|
|
if (ret)
|
|
goto cleanup;
|
|
|
|
/* Allocate and initialize the zone groups */
|
|
for (ztype = 0; ztype < ZONEFS_ZTYPE_MAX; ztype++) {
|
|
ret = zonefs_init_zgroup(sb, &zd, ztype);
|
|
if (ret) {
|
|
zonefs_info(sb,
|
|
"Zone group \"%s\" initialization failed\n",
|
|
zonefs_zgroup_name(ztype));
|
|
break;
|
|
}
|
|
}
|
|
|
|
cleanup:
|
|
zonefs_free_zone_info(&zd);
|
|
if (ret)
|
|
zonefs_free_zgroups(sb);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* 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, sb->s_bdev, &bio_vec, 1, REQ_OP_READ);
|
|
bio.bi_iter.bi_sector = 0;
|
|
bio_add_page(&bio, page, PAGE_SIZE, 0);
|
|
|
|
ret = submit_bio_wait(&bio);
|
|
if (ret)
|
|
goto free_page;
|
|
|
|
super = page_address(page);
|
|
|
|
ret = -EINVAL;
|
|
if (le32_to_cpu(super->s_magic) != ZONEFS_MAGIC)
|
|
goto free_page;
|
|
|
|
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 free_page;
|
|
}
|
|
|
|
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 free_page;
|
|
}
|
|
|
|
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 free_page;
|
|
}
|
|
}
|
|
|
|
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 free_page;
|
|
}
|
|
}
|
|
|
|
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 free_page;
|
|
}
|
|
|
|
import_uuid(&sbi->s_uuid, super->s_uuid);
|
|
ret = 0;
|
|
|
|
free_page:
|
|
__free_page(page);
|
|
|
|
return ret;
|
|
}
|
|
|
|
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 int zonefs_get_zgroup_inodes(struct super_block *sb)
|
|
{
|
|
struct zonefs_sb_info *sbi = ZONEFS_SB(sb);
|
|
struct inode *dir_inode;
|
|
enum zonefs_ztype ztype;
|
|
|
|
for (ztype = 0; ztype < ZONEFS_ZTYPE_MAX; ztype++) {
|
|
if (!sbi->s_zgroup[ztype].g_nr_zones)
|
|
continue;
|
|
|
|
dir_inode = zonefs_get_zgroup_inode(sb, ztype);
|
|
if (IS_ERR(dir_inode))
|
|
return PTR_ERR(dir_inode);
|
|
|
|
sbi->s_zgroup[ztype].g_inode = dir_inode;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void zonefs_release_zgroup_inodes(struct super_block *sb)
|
|
{
|
|
struct zonefs_sb_info *sbi = ZONEFS_SB(sb);
|
|
enum zonefs_ztype ztype;
|
|
|
|
if (!sbi)
|
|
return;
|
|
|
|
for (ztype = 0; ztype < ZONEFS_ZTYPE_MAX; ztype++) {
|
|
if (sbi->s_zgroup[ztype].g_inode) {
|
|
iput(sbi->s_zgroup[ztype].g_inode);
|
|
sbi->s_zgroup[ztype].g_inode = NULL;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* 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_sb_info *sbi;
|
|
struct inode *inode;
|
|
enum zonefs_ztype ztype;
|
|
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;
|
|
|
|
atomic_set(&sbi->s_wro_seq_files, 0);
|
|
sbi->s_max_wro_seq_files = bdev_max_open_zones(sb->s_bdev);
|
|
atomic_set(&sbi->s_active_seq_files, 0);
|
|
sbi->s_max_active_seq_files = bdev_max_active_zones(sb->s_bdev);
|
|
|
|
ret = zonefs_read_super(sb);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = zonefs_parse_options(sb, data);
|
|
if (ret)
|
|
return ret;
|
|
|
|
zonefs_info(sb, "Mounting %u zones", bdev_nr_zones(sb->s_bdev));
|
|
|
|
if (!sbi->s_max_wro_seq_files &&
|
|
!sbi->s_max_active_seq_files &&
|
|
sbi->s_mount_opts & ZONEFS_MNTOPT_EXPLICIT_OPEN) {
|
|
zonefs_info(sb,
|
|
"No open and active zone limits. Ignoring explicit_open mount option\n");
|
|
sbi->s_mount_opts &= ~ZONEFS_MNTOPT_EXPLICIT_OPEN;
|
|
}
|
|
|
|
/* Initialize the zone groups */
|
|
ret = zonefs_init_zgroups(sb);
|
|
if (ret)
|
|
goto cleanup;
|
|
|
|
/* Create the root directory inode */
|
|
ret = -ENOMEM;
|
|
inode = new_inode(sb);
|
|
if (!inode)
|
|
goto cleanup;
|
|
|
|
inode->i_ino = bdev_nr_zones(sb->s_bdev);
|
|
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 = &zonefs_dir_operations;
|
|
inode->i_size = 2;
|
|
set_nlink(inode, 2);
|
|
for (ztype = 0; ztype < ZONEFS_ZTYPE_MAX; ztype++) {
|
|
if (sbi->s_zgroup[ztype].g_nr_zones) {
|
|
inc_nlink(inode);
|
|
inode->i_size++;
|
|
}
|
|
}
|
|
|
|
sb->s_root = d_make_root(inode);
|
|
if (!sb->s_root)
|
|
goto cleanup;
|
|
|
|
/*
|
|
* Take a reference on the zone groups directory inodes
|
|
* to keep them in the inode cache.
|
|
*/
|
|
ret = zonefs_get_zgroup_inodes(sb);
|
|
if (ret)
|
|
goto cleanup;
|
|
|
|
ret = zonefs_sysfs_register(sb);
|
|
if (ret)
|
|
goto cleanup;
|
|
|
|
return 0;
|
|
|
|
cleanup:
|
|
zonefs_release_zgroup_inodes(sb);
|
|
zonefs_free_zgroups(sb);
|
|
|
|
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);
|
|
|
|
/* Release the reference on the zone group directory inodes */
|
|
zonefs_release_zgroup_inodes(sb);
|
|
|
|
kill_block_super(sb);
|
|
|
|
zonefs_sysfs_unregister(sb);
|
|
zonefs_free_zgroups(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 = zonefs_sysfs_init();
|
|
if (ret)
|
|
goto destroy_inodecache;
|
|
|
|
ret = register_filesystem(&zonefs_type);
|
|
if (ret)
|
|
goto sysfs_exit;
|
|
|
|
return 0;
|
|
|
|
sysfs_exit:
|
|
zonefs_sysfs_exit();
|
|
destroy_inodecache:
|
|
zonefs_destroy_inodecache();
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void __exit zonefs_exit(void)
|
|
{
|
|
unregister_filesystem(&zonefs_type);
|
|
zonefs_sysfs_exit();
|
|
zonefs_destroy_inodecache();
|
|
}
|
|
|
|
MODULE_AUTHOR("Damien Le Moal");
|
|
MODULE_DESCRIPTION("Zone file system for zoned block devices");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS_FS("zonefs");
|
|
module_init(zonefs_init);
|
|
module_exit(zonefs_exit);
|