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- // SPDX-License-Identifier: GPL-2.0
- /*
- * Simple file system for zoned block devices exposing zones as files.
- *
- * Copyright (C) 2019 Western Digital Corporation or its affiliates.
- */
- #include <linux/module.h>
- #include <linux/fs.h>
- #include <linux/magic.h>
- #include <linux/iomap.h>
- #include <linux/init.h>
- #include <linux/slab.h>
- #include <linux/blkdev.h>
- #include <linux/statfs.h>
- #include <linux/writeback.h>
- #include <linux/quotaops.h>
- #include <linux/seq_file.h>
- #include <linux/parser.h>
- #include <linux/uio.h>
- #include <linux/mman.h>
- #include <linux/sched/mm.h>
- #include <linux/crc32.h>
- #include <linux/task_io_accounting_ops.h>
- #include "zonefs.h"
- static inline int zonefs_zone_mgmt(struct inode *inode,
- enum req_opf op)
- {
- struct zonefs_inode_info *zi = ZONEFS_I(inode);
- int ret;
- lockdep_assert_held(&zi->i_truncate_mutex);
- ret = blkdev_zone_mgmt(inode->i_sb->s_bdev, op, zi->i_zsector,
- zi->i_zone_size >> SECTOR_SHIFT, GFP_NOFS);
- if (ret) {
- zonefs_err(inode->i_sb,
- "Zone management operation %s at %llu failed %d\n",
- blk_op_str(op), zi->i_zsector, ret);
- return ret;
- }
- return 0;
- }
- static inline void zonefs_i_size_write(struct inode *inode, loff_t isize)
- {
- struct zonefs_inode_info *zi = ZONEFS_I(inode);
- i_size_write(inode, isize);
- /*
- * A full zone is no longer open/active and does not need
- * explicit closing.
- */
- if (isize >= zi->i_max_size)
- zi->i_flags &= ~ZONEFS_ZONE_OPEN;
- }
- static int zonefs_iomap_begin(struct inode *inode, loff_t offset, loff_t length,
- unsigned int flags, struct iomap *iomap,
- struct iomap *srcmap)
- {
- struct zonefs_inode_info *zi = ZONEFS_I(inode);
- struct super_block *sb = inode->i_sb;
- loff_t isize;
- /* All I/Os should always be within the file maximum size */
- if (WARN_ON_ONCE(offset + length > zi->i_max_size))
- return -EIO;
- /*
- * Sequential zones can only accept direct writes. This is already
- * checked when writes are issued, so warn if we see a page writeback
- * operation.
- */
- if (WARN_ON_ONCE(zi->i_ztype == ZONEFS_ZTYPE_SEQ &&
- (flags & IOMAP_WRITE) && !(flags & IOMAP_DIRECT)))
- return -EIO;
- /*
- * For conventional zones, all blocks are always mapped. For sequential
- * zones, all blocks after always mapped below the inode size (zone
- * write pointer) and unwriten beyond.
- */
- mutex_lock(&zi->i_truncate_mutex);
- isize = i_size_read(inode);
- if (offset >= isize)
- iomap->type = IOMAP_UNWRITTEN;
- else
- iomap->type = IOMAP_MAPPED;
- if (flags & IOMAP_WRITE)
- length = zi->i_max_size - offset;
- else
- length = min(length, isize - offset);
- mutex_unlock(&zi->i_truncate_mutex);
- iomap->offset = ALIGN_DOWN(offset, sb->s_blocksize);
- iomap->length = ALIGN(offset + length, sb->s_blocksize) - iomap->offset;
- iomap->bdev = inode->i_sb->s_bdev;
- iomap->addr = (zi->i_zsector << SECTOR_SHIFT) + iomap->offset;
- return 0;
- }
- static const struct iomap_ops zonefs_iomap_ops = {
- .iomap_begin = zonefs_iomap_begin,
- };
- static int zonefs_readpage(struct file *unused, struct page *page)
- {
- return iomap_readpage(page, &zonefs_iomap_ops);
- }
- static void zonefs_readahead(struct readahead_control *rac)
- {
- iomap_readahead(rac, &zonefs_iomap_ops);
- }
- /*
- * Map blocks for page writeback. This is used only on conventional zone files,
- * which implies that the page range can only be within the fixed inode size.
- */
- static int zonefs_map_blocks(struct iomap_writepage_ctx *wpc,
- struct inode *inode, loff_t offset)
- {
- struct zonefs_inode_info *zi = ZONEFS_I(inode);
- if (WARN_ON_ONCE(zi->i_ztype != ZONEFS_ZTYPE_CNV))
- return -EIO;
- if (WARN_ON_ONCE(offset >= i_size_read(inode)))
- return -EIO;
- /* If the mapping is already OK, nothing needs to be done */
- if (offset >= wpc->iomap.offset &&
- offset < wpc->iomap.offset + wpc->iomap.length)
- return 0;
- return zonefs_iomap_begin(inode, offset, zi->i_max_size - offset,
- IOMAP_WRITE, &wpc->iomap, NULL);
- }
- static const struct iomap_writeback_ops zonefs_writeback_ops = {
- .map_blocks = zonefs_map_blocks,
- };
- static int zonefs_writepage(struct page *page, struct writeback_control *wbc)
- {
- struct iomap_writepage_ctx wpc = { };
- return iomap_writepage(page, wbc, &wpc, &zonefs_writeback_ops);
- }
- static int zonefs_writepages(struct address_space *mapping,
- struct writeback_control *wbc)
- {
- struct iomap_writepage_ctx wpc = { };
- return iomap_writepages(mapping, wbc, &wpc, &zonefs_writeback_ops);
- }
- static int zonefs_swap_activate(struct swap_info_struct *sis,
- struct file *swap_file, sector_t *span)
- {
- struct inode *inode = file_inode(swap_file);
- struct zonefs_inode_info *zi = ZONEFS_I(inode);
- if (zi->i_ztype != ZONEFS_ZTYPE_CNV) {
- zonefs_err(inode->i_sb,
- "swap file: not a conventional zone file\n");
- return -EINVAL;
- }
- return iomap_swapfile_activate(sis, swap_file, span, &zonefs_iomap_ops);
- }
- static const struct address_space_operations zonefs_file_aops = {
- .readpage = zonefs_readpage,
- .readahead = zonefs_readahead,
- .writepage = zonefs_writepage,
- .writepages = zonefs_writepages,
- .set_page_dirty = iomap_set_page_dirty,
- .releasepage = iomap_releasepage,
- .invalidatepage = iomap_invalidatepage,
- .migratepage = iomap_migrate_page,
- .is_partially_uptodate = iomap_is_partially_uptodate,
- .error_remove_page = generic_error_remove_page,
- .direct_IO = noop_direct_IO,
- .swap_activate = zonefs_swap_activate,
- };
- static void zonefs_update_stats(struct inode *inode, loff_t new_isize)
- {
- struct super_block *sb = inode->i_sb;
- struct zonefs_sb_info *sbi = ZONEFS_SB(sb);
- loff_t old_isize = i_size_read(inode);
- loff_t nr_blocks;
- if (new_isize == old_isize)
- return;
- spin_lock(&sbi->s_lock);
- /*
- * This may be called for an update after an IO error.
- * So beware of the values seen.
- */
- if (new_isize < old_isize) {
- nr_blocks = (old_isize - new_isize) >> sb->s_blocksize_bits;
- if (sbi->s_used_blocks > nr_blocks)
- sbi->s_used_blocks -= nr_blocks;
- else
- sbi->s_used_blocks = 0;
- } else {
- sbi->s_used_blocks +=
- (new_isize - old_isize) >> sb->s_blocksize_bits;
- if (sbi->s_used_blocks > sbi->s_blocks)
- sbi->s_used_blocks = sbi->s_blocks;
- }
- spin_unlock(&sbi->s_lock);
- }
- /*
- * Check a zone condition and adjust its file inode access permissions for
- * offline and readonly zones. Return the inode size corresponding to the
- * amount of readable data in the zone.
- */
- static loff_t zonefs_check_zone_condition(struct inode *inode,
- struct blk_zone *zone, bool warn,
- bool mount)
- {
- struct zonefs_inode_info *zi = ZONEFS_I(inode);
- switch (zone->cond) {
- case BLK_ZONE_COND_OFFLINE:
- /*
- * Dead zone: make the inode immutable, disable all accesses
- * and set the file size to 0 (zone wp set to zone start).
- */
- if (warn)
- zonefs_warn(inode->i_sb, "inode %lu: offline zone\n",
- inode->i_ino);
- inode->i_flags |= S_IMMUTABLE;
- inode->i_mode &= ~0777;
- zone->wp = zone->start;
- return 0;
- case BLK_ZONE_COND_READONLY:
- /*
- * The write pointer of read-only zones is invalid. If such a
- * zone is found during mount, the file size cannot be retrieved
- * so we treat the zone as offline (mount == true case).
- * Otherwise, keep the file size as it was when last updated
- * so that the user can recover data. In both cases, writes are
- * always disabled for the zone.
- */
- if (warn)
- zonefs_warn(inode->i_sb, "inode %lu: read-only zone\n",
- inode->i_ino);
- inode->i_flags |= S_IMMUTABLE;
- if (mount) {
- zone->cond = BLK_ZONE_COND_OFFLINE;
- inode->i_mode &= ~0777;
- zone->wp = zone->start;
- return 0;
- }
- inode->i_mode &= ~0222;
- return i_size_read(inode);
- case BLK_ZONE_COND_FULL:
- /* The write pointer of full zones is invalid. */
- return zi->i_max_size;
- default:
- if (zi->i_ztype == ZONEFS_ZTYPE_CNV)
- return zi->i_max_size;
- return (zone->wp - zone->start) << SECTOR_SHIFT;
- }
- }
- struct zonefs_ioerr_data {
- struct inode *inode;
- bool write;
- };
- static int zonefs_io_error_cb(struct blk_zone *zone, unsigned int idx,
- void *data)
- {
- struct zonefs_ioerr_data *err = data;
- struct inode *inode = err->inode;
- struct zonefs_inode_info *zi = ZONEFS_I(inode);
- struct super_block *sb = inode->i_sb;
- struct zonefs_sb_info *sbi = ZONEFS_SB(sb);
- loff_t isize, data_size;
- /*
- * Check the zone condition: if the zone is not "bad" (offline or
- * read-only), read errors are simply signaled to the IO issuer as long
- * as there is no inconsistency between the inode size and the amount of
- * data writen in the zone (data_size).
- */
- data_size = zonefs_check_zone_condition(inode, zone, true, false);
- isize = i_size_read(inode);
- if (zone->cond != BLK_ZONE_COND_OFFLINE &&
- zone->cond != BLK_ZONE_COND_READONLY &&
- !err->write && isize == data_size)
- return 0;
- /*
- * At this point, we detected either a bad zone or an inconsistency
- * between the inode size and the amount of data written in the zone.
- * For the latter case, the cause may be a write IO error or an external
- * action on the device. Two error patterns exist:
- * 1) The inode size is lower than the amount of data in the zone:
- * a write operation partially failed and data was writen at the end
- * of the file. This can happen in the case of a large direct IO
- * needing several BIOs and/or write requests to be processed.
- * 2) The inode size is larger than the amount of data in the zone:
- * this can happen with a deferred write error with the use of the
- * device side write cache after getting successful write IO
- * completions. Other possibilities are (a) an external corruption,
- * e.g. an application reset the zone directly, or (b) the device
- * has a serious problem (e.g. firmware bug).
- *
- * In all cases, warn about inode size inconsistency and handle the
- * IO error according to the zone condition and to the mount options.
- */
- if (zi->i_ztype == ZONEFS_ZTYPE_SEQ && isize != data_size)
- zonefs_warn(sb, "inode %lu: invalid size %lld (should be %lld)\n",
- inode->i_ino, isize, data_size);
- /*
- * First handle bad zones signaled by hardware. The mount options
- * errors=zone-ro and errors=zone-offline result in changing the
- * zone condition to read-only and offline respectively, as if the
- * condition was signaled by the hardware.
- */
- if (zone->cond == BLK_ZONE_COND_OFFLINE ||
- sbi->s_mount_opts & ZONEFS_MNTOPT_ERRORS_ZOL) {
- zonefs_warn(sb, "inode %lu: read/write access disabled\n",
- inode->i_ino);
- if (zone->cond != BLK_ZONE_COND_OFFLINE) {
- zone->cond = BLK_ZONE_COND_OFFLINE;
- data_size = zonefs_check_zone_condition(inode, zone,
- false, false);
- }
- } else if (zone->cond == BLK_ZONE_COND_READONLY ||
- sbi->s_mount_opts & ZONEFS_MNTOPT_ERRORS_ZRO) {
- zonefs_warn(sb, "inode %lu: write access disabled\n",
- inode->i_ino);
- if (zone->cond != BLK_ZONE_COND_READONLY) {
- zone->cond = BLK_ZONE_COND_READONLY;
- data_size = zonefs_check_zone_condition(inode, zone,
- false, false);
- }
- }
- /*
- * If the filesystem is mounted with the explicit-open mount option, we
- * need to clear the ZONEFS_ZONE_OPEN flag if the zone transitioned to
- * the read-only or offline condition, to avoid attempting an explicit
- * close of the zone when the inode file is closed.
- */
- if ((sbi->s_mount_opts & ZONEFS_MNTOPT_EXPLICIT_OPEN) &&
- (zone->cond == BLK_ZONE_COND_OFFLINE ||
- zone->cond == BLK_ZONE_COND_READONLY))
- zi->i_flags &= ~ZONEFS_ZONE_OPEN;
- /*
- * If error=remount-ro was specified, any error result in remounting
- * the volume as read-only.
- */
- if ((sbi->s_mount_opts & ZONEFS_MNTOPT_ERRORS_RO) && !sb_rdonly(sb)) {
- zonefs_warn(sb, "remounting filesystem read-only\n");
- sb->s_flags |= SB_RDONLY;
- }
- /*
- * Update block usage stats and the inode size to prevent access to
- * invalid data.
- */
- zonefs_update_stats(inode, data_size);
- zonefs_i_size_write(inode, data_size);
- zi->i_wpoffset = data_size;
- return 0;
- }
- /*
- * When an file IO error occurs, check the file zone to see if there is a change
- * in the zone condition (e.g. offline or read-only). For a failed write to a
- * sequential zone, the zone write pointer position must also be checked to
- * eventually correct the file size and zonefs inode write pointer offset
- * (which can be out of sync with the drive due to partial write failures).
- */
- static void __zonefs_io_error(struct inode *inode, bool write)
- {
- struct zonefs_inode_info *zi = ZONEFS_I(inode);
- struct super_block *sb = inode->i_sb;
- struct zonefs_sb_info *sbi = ZONEFS_SB(sb);
- unsigned int noio_flag;
- unsigned int nr_zones =
- zi->i_zone_size >> (sbi->s_zone_sectors_shift + SECTOR_SHIFT);
- struct zonefs_ioerr_data err = {
- .inode = inode,
- .write = write,
- };
- int ret;
- /*
- * Memory allocations in blkdev_report_zones() can trigger a memory
- * reclaim which may in turn cause a recursion into zonefs as well as
- * struct request allocations for the same device. The former case may
- * end up in a deadlock on the inode truncate mutex, while the latter
- * may prevent IO forward progress. Executing the report zones under
- * the GFP_NOIO context avoids both problems.
- */
- noio_flag = memalloc_noio_save();
- ret = blkdev_report_zones(sb->s_bdev, zi->i_zsector, nr_zones,
- zonefs_io_error_cb, &err);
- if (ret != nr_zones)
- zonefs_err(sb, "Get inode %lu zone information failed %d\n",
- inode->i_ino, ret);
- memalloc_noio_restore(noio_flag);
- }
- static void zonefs_io_error(struct inode *inode, bool write)
- {
- struct zonefs_inode_info *zi = ZONEFS_I(inode);
- mutex_lock(&zi->i_truncate_mutex);
- __zonefs_io_error(inode, write);
- mutex_unlock(&zi->i_truncate_mutex);
- }
- static int zonefs_file_truncate(struct inode *inode, loff_t isize)
- {
- struct zonefs_inode_info *zi = ZONEFS_I(inode);
- loff_t old_isize;
- enum req_opf op;
- int ret = 0;
- /*
- * Only sequential zone files can be truncated and truncation is allowed
- * only down to a 0 size, which is equivalent to a zone reset, and to
- * the maximum file size, which is equivalent to a zone finish.
- */
- if (zi->i_ztype != ZONEFS_ZTYPE_SEQ)
- return -EPERM;
- if (!isize)
- op = REQ_OP_ZONE_RESET;
- else if (isize == zi->i_max_size)
- op = REQ_OP_ZONE_FINISH;
- else
- return -EPERM;
- inode_dio_wait(inode);
- /* Serialize against page faults */
- down_write(&zi->i_mmap_sem);
- /* Serialize against zonefs_iomap_begin() */
- mutex_lock(&zi->i_truncate_mutex);
- old_isize = i_size_read(inode);
- if (isize == old_isize)
- goto unlock;
- ret = zonefs_zone_mgmt(inode, op);
- if (ret)
- goto unlock;
- /*
- * If the mount option ZONEFS_MNTOPT_EXPLICIT_OPEN is set,
- * take care of open zones.
- */
- if (zi->i_flags & ZONEFS_ZONE_OPEN) {
- /*
- * Truncating a zone to EMPTY or FULL is the equivalent of
- * closing the zone. For a truncation to 0, we need to
- * re-open the zone to ensure new writes can be processed.
- * For a truncation to the maximum file size, the zone is
- * closed and writes cannot be accepted anymore, so clear
- * the open flag.
- */
- if (!isize)
- ret = zonefs_zone_mgmt(inode, REQ_OP_ZONE_OPEN);
- else
- zi->i_flags &= ~ZONEFS_ZONE_OPEN;
- }
- zonefs_update_stats(inode, isize);
- truncate_setsize(inode, isize);
- zi->i_wpoffset = isize;
- unlock:
- mutex_unlock(&zi->i_truncate_mutex);
- up_write(&zi->i_mmap_sem);
- return ret;
- }
- static int zonefs_inode_setattr(struct dentry *dentry, struct iattr *iattr)
- {
- struct inode *inode = d_inode(dentry);
- int ret;
- if (unlikely(IS_IMMUTABLE(inode)))
- return -EPERM;
- ret = setattr_prepare(dentry, iattr);
- if (ret)
- return ret;
- /*
- * Since files and directories cannot be created nor deleted, do not
- * allow setting any write attributes on the sub-directories grouping
- * files by zone type.
- */
- if ((iattr->ia_valid & ATTR_MODE) && S_ISDIR(inode->i_mode) &&
- (iattr->ia_mode & 0222))
- return -EPERM;
- if (((iattr->ia_valid & ATTR_UID) &&
- !uid_eq(iattr->ia_uid, inode->i_uid)) ||
- ((iattr->ia_valid & ATTR_GID) &&
- !gid_eq(iattr->ia_gid, inode->i_gid))) {
- ret = dquot_transfer(inode, iattr);
- if (ret)
- return ret;
- }
- if (iattr->ia_valid & ATTR_SIZE) {
- ret = zonefs_file_truncate(inode, iattr->ia_size);
- if (ret)
- return ret;
- }
- setattr_copy(inode, iattr);
- return 0;
- }
- static const struct inode_operations zonefs_file_inode_operations = {
- .setattr = zonefs_inode_setattr,
- };
- static int zonefs_file_fsync(struct file *file, loff_t start, loff_t end,
- int datasync)
- {
- struct inode *inode = file_inode(file);
- int ret = 0;
- if (unlikely(IS_IMMUTABLE(inode)))
- return -EPERM;
- /*
- * Since only direct writes are allowed in sequential files, page cache
- * flush is needed only for conventional zone files.
- */
- if (ZONEFS_I(inode)->i_ztype == ZONEFS_ZTYPE_CNV)
- ret = file_write_and_wait_range(file, start, end);
- if (!ret)
- ret = blkdev_issue_flush(inode->i_sb->s_bdev, GFP_KERNEL);
- if (ret)
- zonefs_io_error(inode, true);
- return ret;
- }
- static vm_fault_t zonefs_filemap_fault(struct vm_fault *vmf)
- {
- struct zonefs_inode_info *zi = ZONEFS_I(file_inode(vmf->vma->vm_file));
- vm_fault_t ret;
- down_read(&zi->i_mmap_sem);
- ret = filemap_fault(vmf);
- up_read(&zi->i_mmap_sem);
- return ret;
- }
- static vm_fault_t zonefs_filemap_page_mkwrite(struct vm_fault *vmf)
- {
- struct inode *inode = file_inode(vmf->vma->vm_file);
- struct zonefs_inode_info *zi = ZONEFS_I(inode);
- vm_fault_t ret;
- if (unlikely(IS_IMMUTABLE(inode)))
- return VM_FAULT_SIGBUS;
- /*
- * Sanity check: only conventional zone files can have shared
- * writeable mappings.
- */
- if (WARN_ON_ONCE(zi->i_ztype != ZONEFS_ZTYPE_CNV))
- return VM_FAULT_NOPAGE;
- sb_start_pagefault(inode->i_sb);
- file_update_time(vmf->vma->vm_file);
- /* Serialize against truncates */
- down_read(&zi->i_mmap_sem);
- ret = iomap_page_mkwrite(vmf, &zonefs_iomap_ops);
- up_read(&zi->i_mmap_sem);
- sb_end_pagefault(inode->i_sb);
- return ret;
- }
- static const struct vm_operations_struct zonefs_file_vm_ops = {
- .fault = zonefs_filemap_fault,
- .map_pages = filemap_map_pages,
- .page_mkwrite = zonefs_filemap_page_mkwrite,
- };
- static int zonefs_file_mmap(struct file *file, struct vm_area_struct *vma)
- {
- /*
- * Conventional zones accept random writes, so their files can support
- * shared writable mappings. For sequential zone files, only read
- * mappings are possible since there are no guarantees for write
- * ordering between msync() and page cache writeback.
- */
- if (ZONEFS_I(file_inode(file))->i_ztype == ZONEFS_ZTYPE_SEQ &&
- (vma->vm_flags & VM_SHARED) && (vma->vm_flags & VM_MAYWRITE))
- return -EINVAL;
- file_accessed(file);
- vma->vm_ops = &zonefs_file_vm_ops;
- return 0;
- }
- static loff_t zonefs_file_llseek(struct file *file, loff_t offset, int whence)
- {
- loff_t isize = i_size_read(file_inode(file));
- /*
- * Seeks are limited to below the zone size for conventional zones
- * and below the zone write pointer for sequential zones. In both
- * cases, this limit is the inode size.
- */
- return generic_file_llseek_size(file, offset, whence, isize, isize);
- }
- static int zonefs_file_write_dio_end_io(struct kiocb *iocb, ssize_t size,
- int error, unsigned int flags)
- {
- struct inode *inode = file_inode(iocb->ki_filp);
- struct zonefs_inode_info *zi = ZONEFS_I(inode);
- if (error) {
- zonefs_io_error(inode, true);
- return error;
- }
- if (size && zi->i_ztype != ZONEFS_ZTYPE_CNV) {
- /*
- * Note that we may be seeing completions out of order,
- * but that is not a problem since a write completed
- * successfully necessarily means that all preceding writes
- * were also successful. So we can safely increase the inode
- * size to the write end location.
- */
- mutex_lock(&zi->i_truncate_mutex);
- if (i_size_read(inode) < iocb->ki_pos + size) {
- zonefs_update_stats(inode, iocb->ki_pos + size);
- zonefs_i_size_write(inode, iocb->ki_pos + size);
- }
- mutex_unlock(&zi->i_truncate_mutex);
- }
- return 0;
- }
- static const struct iomap_dio_ops zonefs_write_dio_ops = {
- .end_io = zonefs_file_write_dio_end_io,
- };
- static ssize_t zonefs_file_dio_append(struct kiocb *iocb, struct iov_iter *from)
- {
- struct inode *inode = file_inode(iocb->ki_filp);
- struct zonefs_inode_info *zi = ZONEFS_I(inode);
- struct block_device *bdev = inode->i_sb->s_bdev;
- unsigned int max;
- struct bio *bio;
- ssize_t size;
- int nr_pages;
- ssize_t ret;
- max = queue_max_zone_append_sectors(bdev_get_queue(bdev));
- max = ALIGN_DOWN(max << SECTOR_SHIFT, inode->i_sb->s_blocksize);
- iov_iter_truncate(from, max);
- nr_pages = iov_iter_npages(from, BIO_MAX_PAGES);
- if (!nr_pages)
- return 0;
- bio = bio_alloc_bioset(GFP_NOFS, nr_pages, &fs_bio_set);
- if (!bio)
- return -ENOMEM;
- bio_set_dev(bio, bdev);
- bio->bi_iter.bi_sector = zi->i_zsector;
- bio->bi_write_hint = iocb->ki_hint;
- bio->bi_ioprio = iocb->ki_ioprio;
- bio->bi_opf = REQ_OP_ZONE_APPEND | REQ_SYNC | REQ_IDLE;
- if (iocb->ki_flags & IOCB_DSYNC)
- bio->bi_opf |= REQ_FUA;
- ret = bio_iov_iter_get_pages(bio, from);
- if (unlikely(ret))
- goto out_release;
- size = bio->bi_iter.bi_size;
- task_io_account_write(size);
- if (iocb->ki_flags & IOCB_HIPRI)
- bio_set_polled(bio, iocb);
- ret = submit_bio_wait(bio);
- zonefs_file_write_dio_end_io(iocb, size, ret, 0);
- out_release:
- bio_release_pages(bio, false);
- bio_put(bio);
- if (ret >= 0) {
- iocb->ki_pos += size;
- return size;
- }
- return ret;
- }
- /*
- * Do not exceed the LFS limits nor the file zone size. If pos is under the
- * limit it becomes a short access. If it exceeds the limit, return -EFBIG.
- */
- static loff_t zonefs_write_check_limits(struct file *file, loff_t pos,
- loff_t count)
- {
- struct inode *inode = file_inode(file);
- struct zonefs_inode_info *zi = ZONEFS_I(inode);
- loff_t limit = rlimit(RLIMIT_FSIZE);
- loff_t max_size = zi->i_max_size;
- if (limit != RLIM_INFINITY) {
- if (pos >= limit) {
- send_sig(SIGXFSZ, current, 0);
- return -EFBIG;
- }
- count = min(count, limit - pos);
- }
- if (!(file->f_flags & O_LARGEFILE))
- max_size = min_t(loff_t, MAX_NON_LFS, max_size);
- if (unlikely(pos >= max_size))
- return -EFBIG;
- return min(count, max_size - pos);
- }
- static ssize_t zonefs_write_checks(struct kiocb *iocb, struct iov_iter *from)
- {
- struct file *file = iocb->ki_filp;
- struct inode *inode = file_inode(file);
- struct zonefs_inode_info *zi = ZONEFS_I(inode);
- loff_t count;
- if (IS_SWAPFILE(inode))
- return -ETXTBSY;
- if (!iov_iter_count(from))
- return 0;
- if ((iocb->ki_flags & IOCB_NOWAIT) && !(iocb->ki_flags & IOCB_DIRECT))
- return -EINVAL;
- if (iocb->ki_flags & IOCB_APPEND) {
- if (zi->i_ztype != ZONEFS_ZTYPE_SEQ)
- return -EINVAL;
- mutex_lock(&zi->i_truncate_mutex);
- iocb->ki_pos = zi->i_wpoffset;
- mutex_unlock(&zi->i_truncate_mutex);
- }
- count = zonefs_write_check_limits(file, iocb->ki_pos,
- iov_iter_count(from));
- if (count < 0)
- return count;
- iov_iter_truncate(from, count);
- return iov_iter_count(from);
- }
- /*
- * Handle direct writes. For sequential zone files, this is the only possible
- * write path. For these files, check that the user is issuing writes
- * sequentially from the end of the file. This code assumes that the block layer
- * delivers write requests to the device in sequential order. This is always the
- * case if a block IO scheduler implementing the ELEVATOR_F_ZBD_SEQ_WRITE
- * elevator feature is being used (e.g. mq-deadline). The block layer always
- * automatically select such an elevator for zoned block devices during the
- * device initialization.
- */
- static ssize_t zonefs_file_dio_write(struct kiocb *iocb, struct iov_iter *from)
- {
- struct inode *inode = file_inode(iocb->ki_filp);
- struct zonefs_inode_info *zi = ZONEFS_I(inode);
- struct super_block *sb = inode->i_sb;
- bool sync = is_sync_kiocb(iocb);
- bool append = false;
- ssize_t ret, count;
- /*
- * For async direct IOs to sequential zone files, refuse IOCB_NOWAIT
- * as this can cause write reordering (e.g. the first aio gets EAGAIN
- * on the inode lock but the second goes through but is now unaligned).
- */
- if (zi->i_ztype == ZONEFS_ZTYPE_SEQ && !sync &&
- (iocb->ki_flags & IOCB_NOWAIT))
- return -EOPNOTSUPP;
- if (iocb->ki_flags & IOCB_NOWAIT) {
- if (!inode_trylock(inode))
- return -EAGAIN;
- } else {
- inode_lock(inode);
- }
- count = zonefs_write_checks(iocb, from);
- if (count <= 0) {
- ret = count;
- goto inode_unlock;
- }
- if ((iocb->ki_pos | count) & (sb->s_blocksize - 1)) {
- ret = -EINVAL;
- goto inode_unlock;
- }
- /* Enforce sequential writes (append only) in sequential zones */
- if (zi->i_ztype == ZONEFS_ZTYPE_SEQ) {
- mutex_lock(&zi->i_truncate_mutex);
- if (iocb->ki_pos != zi->i_wpoffset) {
- mutex_unlock(&zi->i_truncate_mutex);
- ret = -EINVAL;
- goto inode_unlock;
- }
- mutex_unlock(&zi->i_truncate_mutex);
- append = sync;
- }
- if (append)
- ret = zonefs_file_dio_append(iocb, from);
- else
- ret = iomap_dio_rw(iocb, from, &zonefs_iomap_ops,
- &zonefs_write_dio_ops, sync);
- if (zi->i_ztype == ZONEFS_ZTYPE_SEQ &&
- (ret > 0 || ret == -EIOCBQUEUED)) {
- if (ret > 0)
- count = ret;
- mutex_lock(&zi->i_truncate_mutex);
- zi->i_wpoffset += count;
- mutex_unlock(&zi->i_truncate_mutex);
- }
- inode_unlock:
- inode_unlock(inode);
- return ret;
- }
- static ssize_t zonefs_file_buffered_write(struct kiocb *iocb,
- struct iov_iter *from)
- {
- struct inode *inode = file_inode(iocb->ki_filp);
- struct zonefs_inode_info *zi = ZONEFS_I(inode);
- ssize_t ret;
- /*
- * Direct IO writes are mandatory for sequential zone files so that the
- * write IO issuing order is preserved.
- */
- if (zi->i_ztype != ZONEFS_ZTYPE_CNV)
- return -EIO;
- if (iocb->ki_flags & IOCB_NOWAIT) {
- if (!inode_trylock(inode))
- return -EAGAIN;
- } else {
- inode_lock(inode);
- }
- ret = zonefs_write_checks(iocb, from);
- if (ret <= 0)
- goto inode_unlock;
- ret = iomap_file_buffered_write(iocb, from, &zonefs_iomap_ops);
- if (ret > 0)
- iocb->ki_pos += ret;
- else if (ret == -EIO)
- zonefs_io_error(inode, true);
- inode_unlock:
- inode_unlock(inode);
- if (ret > 0)
- ret = generic_write_sync(iocb, ret);
- return ret;
- }
- static ssize_t zonefs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
- {
- struct inode *inode = file_inode(iocb->ki_filp);
- if (unlikely(IS_IMMUTABLE(inode)))
- return -EPERM;
- if (sb_rdonly(inode->i_sb))
- return -EROFS;
- /* Write operations beyond the zone size are not allowed */
- if (iocb->ki_pos >= ZONEFS_I(inode)->i_max_size)
- return -EFBIG;
- if (iocb->ki_flags & IOCB_DIRECT) {
- ssize_t ret = zonefs_file_dio_write(iocb, from);
- if (ret != -ENOTBLK)
- return ret;
- }
- return zonefs_file_buffered_write(iocb, from);
- }
- static int zonefs_file_read_dio_end_io(struct kiocb *iocb, ssize_t size,
- int error, unsigned int flags)
- {
- if (error) {
- zonefs_io_error(file_inode(iocb->ki_filp), false);
- return error;
- }
- return 0;
- }
- static const struct iomap_dio_ops zonefs_read_dio_ops = {
- .end_io = zonefs_file_read_dio_end_io,
- };
- static ssize_t zonefs_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
- {
- struct inode *inode = file_inode(iocb->ki_filp);
- struct zonefs_inode_info *zi = ZONEFS_I(inode);
- struct super_block *sb = inode->i_sb;
- loff_t isize;
- ssize_t ret;
- /* Offline zones cannot be read */
- if (unlikely(IS_IMMUTABLE(inode) && !(inode->i_mode & 0777)))
- return -EPERM;
- if (iocb->ki_pos >= zi->i_max_size)
- return 0;
- if (iocb->ki_flags & IOCB_NOWAIT) {
- if (!inode_trylock_shared(inode))
- return -EAGAIN;
- } else {
- inode_lock_shared(inode);
- }
- /* Limit read operations to written data */
- mutex_lock(&zi->i_truncate_mutex);
- isize = i_size_read(inode);
- if (iocb->ki_pos >= isize) {
- mutex_unlock(&zi->i_truncate_mutex);
- ret = 0;
- goto inode_unlock;
- }
- iov_iter_truncate(to, isize - iocb->ki_pos);
- mutex_unlock(&zi->i_truncate_mutex);
- if (iocb->ki_flags & IOCB_DIRECT) {
- size_t count = iov_iter_count(to);
- if ((iocb->ki_pos | count) & (sb->s_blocksize - 1)) {
- ret = -EINVAL;
- goto inode_unlock;
- }
- file_accessed(iocb->ki_filp);
- ret = iomap_dio_rw(iocb, to, &zonefs_iomap_ops,
- &zonefs_read_dio_ops, is_sync_kiocb(iocb));
- } else {
- ret = generic_file_read_iter(iocb, to);
- if (ret == -EIO)
- zonefs_io_error(inode, false);
- }
- inode_unlock:
- inode_unlock_shared(inode);
- return ret;
- }
- static inline bool zonefs_file_use_exp_open(struct inode *inode, struct file *file)
- {
- struct zonefs_inode_info *zi = ZONEFS_I(inode);
- struct zonefs_sb_info *sbi = ZONEFS_SB(inode->i_sb);
- if (!(sbi->s_mount_opts & ZONEFS_MNTOPT_EXPLICIT_OPEN))
- return false;
- if (zi->i_ztype != ZONEFS_ZTYPE_SEQ)
- return false;
- if (!(file->f_mode & FMODE_WRITE))
- return false;
- return true;
- }
- static int zonefs_open_zone(struct inode *inode)
- {
- struct zonefs_inode_info *zi = ZONEFS_I(inode);
- struct zonefs_sb_info *sbi = ZONEFS_SB(inode->i_sb);
- int ret = 0;
- mutex_lock(&zi->i_truncate_mutex);
- if (!zi->i_wr_refcnt) {
- if (atomic_inc_return(&sbi->s_open_zones) > sbi->s_max_open_zones) {
- atomic_dec(&sbi->s_open_zones);
- ret = -EBUSY;
- goto unlock;
- }
- if (i_size_read(inode) < zi->i_max_size) {
- ret = zonefs_zone_mgmt(inode, REQ_OP_ZONE_OPEN);
- if (ret) {
- atomic_dec(&sbi->s_open_zones);
- goto unlock;
- }
- zi->i_flags |= ZONEFS_ZONE_OPEN;
- }
- }
- zi->i_wr_refcnt++;
- unlock:
- mutex_unlock(&zi->i_truncate_mutex);
- return ret;
- }
- static int zonefs_file_open(struct inode *inode, struct file *file)
- {
- int ret;
- ret = generic_file_open(inode, file);
- if (ret)
- return ret;
- if (zonefs_file_use_exp_open(inode, file))
- return zonefs_open_zone(inode);
- return 0;
- }
- static void zonefs_close_zone(struct inode *inode)
- {
- struct zonefs_inode_info *zi = ZONEFS_I(inode);
- int ret = 0;
- mutex_lock(&zi->i_truncate_mutex);
- zi->i_wr_refcnt--;
- if (!zi->i_wr_refcnt) {
- struct zonefs_sb_info *sbi = ZONEFS_SB(inode->i_sb);
- struct super_block *sb = inode->i_sb;
- /*
- * If the file zone is full, it is not open anymore and we only
- * need to decrement the open count.
- */
- if (!(zi->i_flags & ZONEFS_ZONE_OPEN))
- goto dec;
- ret = zonefs_zone_mgmt(inode, REQ_OP_ZONE_CLOSE);
- if (ret) {
- __zonefs_io_error(inode, false);
- /*
- * Leaving zones explicitly open may lead to a state
- * where most zones cannot be written (zone resources
- * exhausted). So take preventive action by remounting
- * read-only.
- */
- if (zi->i_flags & ZONEFS_ZONE_OPEN &&
- !(sb->s_flags & SB_RDONLY)) {
- zonefs_warn(sb, "closing zone failed, remounting filesystem read-only\n");
- sb->s_flags |= SB_RDONLY;
- }
- }
- zi->i_flags &= ~ZONEFS_ZONE_OPEN;
- dec:
- atomic_dec(&sbi->s_open_zones);
- }
- mutex_unlock(&zi->i_truncate_mutex);
- }
- static int zonefs_file_release(struct inode *inode, struct file *file)
- {
- /*
- * If we explicitly open a zone we must close it again as well, but the
- * zone management operation can fail (either due to an IO error or as
- * the zone has gone offline or read-only). Make sure we don't fail the
- * close(2) for user-space.
- */
- if (zonefs_file_use_exp_open(inode, file))
- zonefs_close_zone(inode);
- return 0;
- }
- static const struct file_operations zonefs_file_operations = {
- .open = zonefs_file_open,
- .release = zonefs_file_release,
- .fsync = zonefs_file_fsync,
- .mmap = zonefs_file_mmap,
- .llseek = zonefs_file_llseek,
- .read_iter = zonefs_file_read_iter,
- .write_iter = zonefs_file_write_iter,
- .splice_read = generic_file_splice_read,
- .splice_write = iter_file_splice_write,
- .iopoll = iomap_dio_iopoll,
- };
- static struct kmem_cache *zonefs_inode_cachep;
- static struct inode *zonefs_alloc_inode(struct super_block *sb)
- {
- struct zonefs_inode_info *zi;
- zi = kmem_cache_alloc(zonefs_inode_cachep, GFP_KERNEL);
- if (!zi)
- return NULL;
- inode_init_once(&zi->i_vnode);
- mutex_init(&zi->i_truncate_mutex);
- init_rwsem(&zi->i_mmap_sem);
- zi->i_wr_refcnt = 0;
- return &zi->i_vnode;
- }
- static void zonefs_free_inode(struct inode *inode)
- {
- kmem_cache_free(zonefs_inode_cachep, ZONEFS_I(inode));
- }
- /*
- * File system stat.
- */
- static int zonefs_statfs(struct dentry *dentry, struct kstatfs *buf)
- {
- struct super_block *sb = dentry->d_sb;
- struct zonefs_sb_info *sbi = ZONEFS_SB(sb);
- enum zonefs_ztype t;
- u64 fsid;
- buf->f_type = ZONEFS_MAGIC;
- buf->f_bsize = sb->s_blocksize;
- buf->f_namelen = ZONEFS_NAME_MAX;
- spin_lock(&sbi->s_lock);
- buf->f_blocks = sbi->s_blocks;
- if (WARN_ON(sbi->s_used_blocks > sbi->s_blocks))
- buf->f_bfree = 0;
- else
- buf->f_bfree = buf->f_blocks - sbi->s_used_blocks;
- buf->f_bavail = buf->f_bfree;
- for (t = 0; t < ZONEFS_ZTYPE_MAX; t++) {
- if (sbi->s_nr_files[t])
- buf->f_files += sbi->s_nr_files[t] + 1;
- }
- buf->f_ffree = 0;
- spin_unlock(&sbi->s_lock);
- fsid = le64_to_cpup((void *)sbi->s_uuid.b) ^
- le64_to_cpup((void *)sbi->s_uuid.b + sizeof(u64));
- buf->f_fsid = u64_to_fsid(fsid);
- return 0;
- }
- enum {
- Opt_errors_ro, Opt_errors_zro, Opt_errors_zol, Opt_errors_repair,
- Opt_explicit_open, Opt_err,
- };
- static const match_table_t tokens = {
- { Opt_errors_ro, "errors=remount-ro"},
- { Opt_errors_zro, "errors=zone-ro"},
- { Opt_errors_zol, "errors=zone-offline"},
- { Opt_errors_repair, "errors=repair"},
- { Opt_explicit_open, "explicit-open" },
- { Opt_err, NULL}
- };
- static int zonefs_parse_options(struct super_block *sb, char *options)
- {
- struct zonefs_sb_info *sbi = ZONEFS_SB(sb);
- substring_t args[MAX_OPT_ARGS];
- char *p;
- if (!options)
- return 0;
- while ((p = strsep(&options, ",")) != NULL) {
- int token;
- if (!*p)
- continue;
- token = match_token(p, tokens, args);
- switch (token) {
- case Opt_errors_ro:
- sbi->s_mount_opts &= ~ZONEFS_MNTOPT_ERRORS_MASK;
- sbi->s_mount_opts |= ZONEFS_MNTOPT_ERRORS_RO;
- break;
- case Opt_errors_zro:
- sbi->s_mount_opts &= ~ZONEFS_MNTOPT_ERRORS_MASK;
- sbi->s_mount_opts |= ZONEFS_MNTOPT_ERRORS_ZRO;
- break;
- case Opt_errors_zol:
- sbi->s_mount_opts &= ~ZONEFS_MNTOPT_ERRORS_MASK;
- sbi->s_mount_opts |= ZONEFS_MNTOPT_ERRORS_ZOL;
- break;
- case Opt_errors_repair:
- sbi->s_mount_opts &= ~ZONEFS_MNTOPT_ERRORS_MASK;
- sbi->s_mount_opts |= ZONEFS_MNTOPT_ERRORS_REPAIR;
- break;
- case Opt_explicit_open:
- sbi->s_mount_opts |= ZONEFS_MNTOPT_EXPLICIT_OPEN;
- break;
- default:
- return -EINVAL;
- }
- }
- return 0;
- }
- static int zonefs_show_options(struct seq_file *seq, struct dentry *root)
- {
- struct zonefs_sb_info *sbi = ZONEFS_SB(root->d_sb);
- if (sbi->s_mount_opts & ZONEFS_MNTOPT_ERRORS_RO)
- seq_puts(seq, ",errors=remount-ro");
- if (sbi->s_mount_opts & ZONEFS_MNTOPT_ERRORS_ZRO)
- seq_puts(seq, ",errors=zone-ro");
- if (sbi->s_mount_opts & ZONEFS_MNTOPT_ERRORS_ZOL)
- seq_puts(seq, ",errors=zone-offline");
- if (sbi->s_mount_opts & ZONEFS_MNTOPT_ERRORS_REPAIR)
- seq_puts(seq, ",errors=repair");
- return 0;
- }
- static int zonefs_remount(struct super_block *sb, int *flags, char *data)
- {
- sync_filesystem(sb);
- return zonefs_parse_options(sb, data);
- }
- static const struct super_operations zonefs_sops = {
- .alloc_inode = zonefs_alloc_inode,
- .free_inode = zonefs_free_inode,
- .statfs = zonefs_statfs,
- .remount_fs = zonefs_remount,
- .show_options = zonefs_show_options,
- };
- static const struct inode_operations zonefs_dir_inode_operations = {
- .lookup = simple_lookup,
- .setattr = zonefs_inode_setattr,
- };
- static void zonefs_init_dir_inode(struct inode *parent, struct inode *inode,
- enum zonefs_ztype type)
- {
- struct super_block *sb = parent->i_sb;
- inode->i_ino = blkdev_nr_zones(sb->s_bdev->bd_disk) + type + 1;
- inode_init_owner(inode, parent, S_IFDIR | 0555);
- inode->i_op = &zonefs_dir_inode_operations;
- inode->i_fop = &simple_dir_operations;
- set_nlink(inode, 2);
- inc_nlink(parent);
- }
- static void zonefs_init_file_inode(struct inode *inode, struct blk_zone *zone,
- enum zonefs_ztype type)
- {
- struct super_block *sb = inode->i_sb;
- struct zonefs_sb_info *sbi = ZONEFS_SB(sb);
- struct zonefs_inode_info *zi = ZONEFS_I(inode);
- inode->i_ino = zone->start >> sbi->s_zone_sectors_shift;
- inode->i_mode = S_IFREG | sbi->s_perm;
- zi->i_ztype = type;
- zi->i_zsector = zone->start;
- zi->i_zone_size = zone->len << SECTOR_SHIFT;
- zi->i_max_size = min_t(loff_t, MAX_LFS_FILESIZE,
- zone->capacity << SECTOR_SHIFT);
- zi->i_wpoffset = zonefs_check_zone_condition(inode, zone, true, true);
- inode->i_uid = sbi->s_uid;
- inode->i_gid = sbi->s_gid;
- inode->i_size = zi->i_wpoffset;
- inode->i_blocks = zi->i_max_size >> SECTOR_SHIFT;
- inode->i_op = &zonefs_file_inode_operations;
- inode->i_fop = &zonefs_file_operations;
- inode->i_mapping->a_ops = &zonefs_file_aops;
- sb->s_maxbytes = max(zi->i_max_size, sb->s_maxbytes);
- sbi->s_blocks += zi->i_max_size >> sb->s_blocksize_bits;
- sbi->s_used_blocks += zi->i_wpoffset >> sb->s_blocksize_bits;
- }
- static struct dentry *zonefs_create_inode(struct dentry *parent,
- const char *name, struct blk_zone *zone,
- enum zonefs_ztype type)
- {
- struct inode *dir = d_inode(parent);
- struct dentry *dentry;
- struct inode *inode;
- dentry = d_alloc_name(parent, name);
- if (!dentry)
- return NULL;
- inode = new_inode(parent->d_sb);
- if (!inode)
- goto dput;
- inode->i_ctime = inode->i_mtime = inode->i_atime = dir->i_ctime;
- if (zone)
- zonefs_init_file_inode(inode, zone, type);
- else
- zonefs_init_dir_inode(dir, inode, type);
- d_add(dentry, inode);
- dir->i_size++;
- return dentry;
- dput:
- dput(dentry);
- return NULL;
- }
- struct zonefs_zone_data {
- struct super_block *sb;
- unsigned int nr_zones[ZONEFS_ZTYPE_MAX];
- struct blk_zone *zones;
- };
- /*
- * Create a zone group and populate it with zone files.
- */
- static int zonefs_create_zgroup(struct zonefs_zone_data *zd,
- enum zonefs_ztype type)
- {
- struct super_block *sb = zd->sb;
- struct zonefs_sb_info *sbi = ZONEFS_SB(sb);
- struct blk_zone *zone, *next, *end;
- const char *zgroup_name;
- char *file_name;
- struct dentry *dir;
- unsigned int n = 0;
- int ret;
- /* If the group is empty, there is nothing to do */
- if (!zd->nr_zones[type])
- return 0;
- file_name = kmalloc(ZONEFS_NAME_MAX, GFP_KERNEL);
- if (!file_name)
- return -ENOMEM;
- if (type == ZONEFS_ZTYPE_CNV)
- zgroup_name = "cnv";
- else
- zgroup_name = "seq";
- dir = zonefs_create_inode(sb->s_root, zgroup_name, NULL, type);
- if (!dir) {
- ret = -ENOMEM;
- goto free;
- }
- /*
- * The first zone contains the super block: skip it.
- */
- end = zd->zones + blkdev_nr_zones(sb->s_bdev->bd_disk);
- for (zone = &zd->zones[1]; zone < end; zone = next) {
- next = zone + 1;
- if (zonefs_zone_type(zone) != type)
- continue;
- /*
- * For conventional zones, contiguous zones can be aggregated
- * together to form larger files. Note that this overwrites the
- * length of the first zone of the set of contiguous zones
- * aggregated together. If one offline or read-only zone is
- * found, assume that all zones aggregated have the same
- * condition.
- */
- if (type == ZONEFS_ZTYPE_CNV &&
- (sbi->s_features & ZONEFS_F_AGGRCNV)) {
- for (; next < end; next++) {
- if (zonefs_zone_type(next) != type)
- break;
- zone->len += next->len;
- zone->capacity += next->capacity;
- if (next->cond == BLK_ZONE_COND_READONLY &&
- zone->cond != BLK_ZONE_COND_OFFLINE)
- zone->cond = BLK_ZONE_COND_READONLY;
- else if (next->cond == BLK_ZONE_COND_OFFLINE)
- zone->cond = BLK_ZONE_COND_OFFLINE;
- }
- if (zone->capacity != zone->len) {
- zonefs_err(sb, "Invalid conventional zone capacity\n");
- ret = -EINVAL;
- goto free;
- }
- }
- /*
- * Use the file number within its group as file name.
- */
- snprintf(file_name, ZONEFS_NAME_MAX - 1, "%u", n);
- if (!zonefs_create_inode(dir, file_name, zone, type)) {
- ret = -ENOMEM;
- goto free;
- }
- n++;
- }
- zonefs_info(sb, "Zone group \"%s\" has %u file%s\n",
- zgroup_name, n, n > 1 ? "s" : "");
- sbi->s_nr_files[type] = n;
- ret = 0;
- free:
- kfree(file_name);
- return ret;
- }
- static int zonefs_get_zone_info_cb(struct blk_zone *zone, unsigned int idx,
- void *data)
- {
- struct zonefs_zone_data *zd = data;
- /*
- * Count the number of usable zones: the first zone at index 0 contains
- * the super block and is ignored.
- */
- switch (zone->type) {
- case BLK_ZONE_TYPE_CONVENTIONAL:
- zone->wp = zone->start + zone->len;
- if (idx)
- zd->nr_zones[ZONEFS_ZTYPE_CNV]++;
- break;
- case BLK_ZONE_TYPE_SEQWRITE_REQ:
- case BLK_ZONE_TYPE_SEQWRITE_PREF:
- if (idx)
- zd->nr_zones[ZONEFS_ZTYPE_SEQ]++;
- break;
- default:
- zonefs_err(zd->sb, "Unsupported zone type 0x%x\n",
- zone->type);
- return -EIO;
- }
- memcpy(&zd->zones[idx], zone, sizeof(struct blk_zone));
- return 0;
- }
- static int zonefs_get_zone_info(struct zonefs_zone_data *zd)
- {
- struct block_device *bdev = zd->sb->s_bdev;
- int ret;
- zd->zones = kvcalloc(blkdev_nr_zones(bdev->bd_disk),
- sizeof(struct blk_zone), GFP_KERNEL);
- if (!zd->zones)
- return -ENOMEM;
- /* Get zones information from the device */
- ret = blkdev_report_zones(bdev, 0, BLK_ALL_ZONES,
- zonefs_get_zone_info_cb, zd);
- if (ret < 0) {
- zonefs_err(zd->sb, "Zone report failed %d\n", ret);
- return ret;
- }
- if (ret != blkdev_nr_zones(bdev->bd_disk)) {
- zonefs_err(zd->sb, "Invalid zone report (%d/%u zones)\n",
- ret, blkdev_nr_zones(bdev->bd_disk));
- return -EIO;
- }
- return 0;
- }
- static inline void zonefs_cleanup_zone_info(struct zonefs_zone_data *zd)
- {
- kvfree(zd->zones);
- }
- /*
- * Read super block information from the device.
- */
- static int zonefs_read_super(struct super_block *sb)
- {
- struct zonefs_sb_info *sbi = ZONEFS_SB(sb);
- struct zonefs_super *super;
- u32 crc, stored_crc;
- struct page *page;
- struct bio_vec bio_vec;
- struct bio bio;
- int ret;
- page = alloc_page(GFP_KERNEL);
- if (!page)
- return -ENOMEM;
- bio_init(&bio, &bio_vec, 1);
- bio.bi_iter.bi_sector = 0;
- bio.bi_opf = REQ_OP_READ;
- bio_set_dev(&bio, sb->s_bdev);
- bio_add_page(&bio, page, PAGE_SIZE, 0);
- ret = submit_bio_wait(&bio);
- if (ret)
- goto free_page;
- super = kmap(page);
- ret = -EINVAL;
- if (le32_to_cpu(super->s_magic) != ZONEFS_MAGIC)
- goto unmap;
- stored_crc = le32_to_cpu(super->s_crc);
- super->s_crc = 0;
- crc = crc32(~0U, (unsigned char *)super, sizeof(struct zonefs_super));
- if (crc != stored_crc) {
- zonefs_err(sb, "Invalid checksum (Expected 0x%08x, got 0x%08x)",
- crc, stored_crc);
- goto unmap;
- }
- sbi->s_features = le64_to_cpu(super->s_features);
- if (sbi->s_features & ~ZONEFS_F_DEFINED_FEATURES) {
- zonefs_err(sb, "Unknown features set 0x%llx\n",
- sbi->s_features);
- goto unmap;
- }
- if (sbi->s_features & ZONEFS_F_UID) {
- sbi->s_uid = make_kuid(current_user_ns(),
- le32_to_cpu(super->s_uid));
- if (!uid_valid(sbi->s_uid)) {
- zonefs_err(sb, "Invalid UID feature\n");
- goto unmap;
- }
- }
- if (sbi->s_features & ZONEFS_F_GID) {
- sbi->s_gid = make_kgid(current_user_ns(),
- le32_to_cpu(super->s_gid));
- if (!gid_valid(sbi->s_gid)) {
- zonefs_err(sb, "Invalid GID feature\n");
- goto unmap;
- }
- }
- if (sbi->s_features & ZONEFS_F_PERM)
- sbi->s_perm = le32_to_cpu(super->s_perm);
- if (memchr_inv(super->s_reserved, 0, sizeof(super->s_reserved))) {
- zonefs_err(sb, "Reserved area is being used\n");
- goto unmap;
- }
- import_uuid(&sbi->s_uuid, super->s_uuid);
- ret = 0;
- unmap:
- kunmap(page);
- free_page:
- __free_page(page);
- return ret;
- }
- /*
- * Check that the device is zoned. If it is, get the list of zones and create
- * sub-directories and files according to the device zone configuration and
- * format options.
- */
- static int zonefs_fill_super(struct super_block *sb, void *data, int silent)
- {
- struct zonefs_zone_data zd;
- struct zonefs_sb_info *sbi;
- struct inode *inode;
- enum zonefs_ztype t;
- int ret;
- if (!bdev_is_zoned(sb->s_bdev)) {
- zonefs_err(sb, "Not a zoned block device\n");
- return -EINVAL;
- }
- /*
- * Initialize super block information: the maximum file size is updated
- * when the zone files are created so that the format option
- * ZONEFS_F_AGGRCNV which increases the maximum file size of a file
- * beyond the zone size is taken into account.
- */
- sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
- if (!sbi)
- return -ENOMEM;
- spin_lock_init(&sbi->s_lock);
- sb->s_fs_info = sbi;
- sb->s_magic = ZONEFS_MAGIC;
- sb->s_maxbytes = 0;
- sb->s_op = &zonefs_sops;
- sb->s_time_gran = 1;
- /*
- * The block size is set to the device physical sector size to ensure
- * that write operations on 512e devices (512B logical block and 4KB
- * physical block) are always aligned to the device physical blocks,
- * as mandated by the ZBC/ZAC specifications.
- */
- sb_set_blocksize(sb, bdev_physical_block_size(sb->s_bdev));
- sbi->s_zone_sectors_shift = ilog2(bdev_zone_sectors(sb->s_bdev));
- sbi->s_uid = GLOBAL_ROOT_UID;
- sbi->s_gid = GLOBAL_ROOT_GID;
- sbi->s_perm = 0640;
- sbi->s_mount_opts = ZONEFS_MNTOPT_ERRORS_RO;
- sbi->s_max_open_zones = bdev_max_open_zones(sb->s_bdev);
- atomic_set(&sbi->s_open_zones, 0);
- if (!sbi->s_max_open_zones &&
- sbi->s_mount_opts & ZONEFS_MNTOPT_EXPLICIT_OPEN) {
- zonefs_info(sb, "No open zones limit. Ignoring explicit_open mount option\n");
- sbi->s_mount_opts &= ~ZONEFS_MNTOPT_EXPLICIT_OPEN;
- }
- ret = zonefs_read_super(sb);
- if (ret)
- return ret;
- ret = zonefs_parse_options(sb, data);
- if (ret)
- return ret;
- memset(&zd, 0, sizeof(struct zonefs_zone_data));
- zd.sb = sb;
- ret = zonefs_get_zone_info(&zd);
- if (ret)
- goto cleanup;
- zonefs_info(sb, "Mounting %u zones",
- blkdev_nr_zones(sb->s_bdev->bd_disk));
- /* Create root directory inode */
- ret = -ENOMEM;
- inode = new_inode(sb);
- if (!inode)
- goto cleanup;
- inode->i_ino = blkdev_nr_zones(sb->s_bdev->bd_disk);
- inode->i_mode = S_IFDIR | 0555;
- inode->i_ctime = inode->i_mtime = inode->i_atime = current_time(inode);
- inode->i_op = &zonefs_dir_inode_operations;
- inode->i_fop = &simple_dir_operations;
- set_nlink(inode, 2);
- sb->s_root = d_make_root(inode);
- if (!sb->s_root)
- goto cleanup;
- /* Create and populate files in zone groups directories */
- for (t = 0; t < ZONEFS_ZTYPE_MAX; t++) {
- ret = zonefs_create_zgroup(&zd, t);
- if (ret)
- break;
- }
- cleanup:
- zonefs_cleanup_zone_info(&zd);
- return ret;
- }
- static struct dentry *zonefs_mount(struct file_system_type *fs_type,
- int flags, const char *dev_name, void *data)
- {
- return mount_bdev(fs_type, flags, dev_name, data, zonefs_fill_super);
- }
- static void zonefs_kill_super(struct super_block *sb)
- {
- struct zonefs_sb_info *sbi = ZONEFS_SB(sb);
- if (sb->s_root)
- d_genocide(sb->s_root);
- kill_block_super(sb);
- kfree(sbi);
- }
- /*
- * File system definition and registration.
- */
- static struct file_system_type zonefs_type = {
- .owner = THIS_MODULE,
- .name = "zonefs",
- .mount = zonefs_mount,
- .kill_sb = zonefs_kill_super,
- .fs_flags = FS_REQUIRES_DEV,
- };
- static int __init zonefs_init_inodecache(void)
- {
- zonefs_inode_cachep = kmem_cache_create("zonefs_inode_cache",
- sizeof(struct zonefs_inode_info), 0,
- (SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD | SLAB_ACCOUNT),
- NULL);
- if (zonefs_inode_cachep == NULL)
- return -ENOMEM;
- return 0;
- }
- static void zonefs_destroy_inodecache(void)
- {
- /*
- * Make sure all delayed rcu free inodes are flushed before we
- * destroy the inode cache.
- */
- rcu_barrier();
- kmem_cache_destroy(zonefs_inode_cachep);
- }
- static int __init zonefs_init(void)
- {
- int ret;
- BUILD_BUG_ON(sizeof(struct zonefs_super) != ZONEFS_SUPER_SIZE);
- ret = zonefs_init_inodecache();
- if (ret)
- return ret;
- ret = register_filesystem(&zonefs_type);
- if (ret) {
- zonefs_destroy_inodecache();
- return ret;
- }
- return 0;
- }
- static void __exit zonefs_exit(void)
- {
- zonefs_destroy_inodecache();
- unregister_filesystem(&zonefs_type);
- }
- MODULE_AUTHOR("Damien Le Moal");
- MODULE_DESCRIPTION("Zone file system for zoned block devices");
- MODULE_LICENSE("GPL");
- MODULE_ALIAS_FS("zonefs");
- MODULE_IMPORT_NS(ANDROID_GKI_VFS_EXPORT_ONLY);
- module_init(zonefs_init);
- module_exit(zonefs_exit);
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