| // 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 "zonefs.h" |
| |
| 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 int zonefs_readpages(struct file *unused, struct address_space *mapping, |
| struct list_head *pages, unsigned int nr_pages) |
| { |
| return iomap_readpages(mapping, pages, nr_pages, &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 const struct address_space_operations zonefs_file_aops = { |
| .readpage = zonefs_readpage, |
| .readpages = zonefs_readpages, |
| .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, |
| }; |
| |
| 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); |
| 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 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); |
| 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_max_size >> (sbi->s_zone_sectors_shift + SECTOR_SHIFT); |
| struct zonefs_ioerr_data err = { |
| .inode = inode, |
| .write = write, |
| }; |
| int ret; |
| |
| mutex_lock(&zi->i_truncate_mutex); |
| |
| /* |
| * 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); |
| |
| 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 = blkdev_zone_mgmt(inode->i_sb->s_bdev, op, zi->i_zsector, |
| zi->i_max_size >> SECTOR_SHIFT, GFP_NOFS); |
| if (ret) { |
| zonefs_err(inode->i_sb, |
| "Zone management operation at %llu failed %d", |
| zi->i_zsector, ret); |
| goto unlock; |
| } |
| |
| 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, NULL); |
| |
| 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); |
| 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, |
| }; |
| |
| /* |
| * 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; |
| size_t count; |
| ssize_t ret; |
| |
| /* |
| * 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 && !is_sync_kiocb(iocb) && |
| (iocb->ki_flags & IOCB_NOWAIT)) |
| return -EOPNOTSUPP; |
| |
| if (iocb->ki_flags & IOCB_NOWAIT) { |
| if (!inode_trylock(inode)) |
| return -EAGAIN; |
| } else { |
| inode_lock(inode); |
| } |
| |
| ret = generic_write_checks(iocb, from); |
| if (ret <= 0) |
| goto inode_unlock; |
| |
| iov_iter_truncate(from, zi->i_max_size - iocb->ki_pos); |
| count = iov_iter_count(from); |
| |
| if ((iocb->ki_pos | count) & (sb->s_blocksize - 1)) { |
| ret = -EINVAL; |
| goto inode_unlock; |
| } |
| |
| /* Enforce sequential writes (append only) in sequential zones */ |
| mutex_lock(&zi->i_truncate_mutex); |
| if (zi->i_ztype == ZONEFS_ZTYPE_SEQ && iocb->ki_pos != zi->i_wpoffset) { |
| mutex_unlock(&zi->i_truncate_mutex); |
| ret = -EINVAL; |
| goto inode_unlock; |
| } |
| mutex_unlock(&zi->i_truncate_mutex); |
| |
| ret = iomap_dio_rw(iocb, from, &zonefs_iomap_ops, |
| &zonefs_write_dio_ops, is_sync_kiocb(iocb)); |
| 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 = generic_write_checks(iocb, from); |
| if (ret <= 0) |
| goto inode_unlock; |
| |
| iov_iter_truncate(from, zi->i_max_size - iocb->ki_pos); |
| |
| 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) |
| return zonefs_file_dio_write(iocb, from); |
| |
| 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 const struct file_operations zonefs_file_operations = { |
| .open = generic_file_open, |
| .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); |
| |
| 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.val[0] = (u32)fsid; |
| buf->f_fsid.val[1] = (u32)(fsid >> 32); |
| |
| return 0; |
| } |
| |
| enum { |
| Opt_errors_ro, Opt_errors_zro, Opt_errors_zol, Opt_errors_repair, |
| 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_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; |
| 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_max_size = min_t(loff_t, MAX_LFS_FILESIZE, |
| zone->len << 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 = zone->len; |
| |
| 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 = -ENOMEM; |
| |
| /* 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) |
| 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; |
| 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; |
| } |
| } |
| |
| /* |
| * 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)) |
| 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; |
| } |
| |
| uuid_copy(&sbi->s_uuid, (uuid_t *)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; |
| |
| ret = zonefs_read_super(sb); |
| if (ret) |
| return ret; |
| |
| ret = zonefs_parse_options(sb, data); |
| if (ret) |
| return ret; |
| |
| memset(&zd, 0, sizeof(struct zonefs_zone_data)); |
| zd.sb = sb; |
| ret = zonefs_get_zone_info(&zd); |
| if (ret) |
| goto cleanup; |
| |
| zonefs_info(sb, "Mounting %u zones", |
| blkdev_nr_zones(sb->s_bdev->bd_disk)); |
| |
| /* Create root directory inode */ |
| ret = -ENOMEM; |
| inode = new_inode(sb); |
| if (!inode) |
| goto cleanup; |
| |
| inode->i_ino = blkdev_nr_zones(sb->s_bdev->bd_disk); |
| inode->i_mode = S_IFDIR | 0555; |
| inode->i_ctime = inode->i_mtime = inode->i_atime = current_time(inode); |
| inode->i_op = &zonefs_dir_inode_operations; |
| inode->i_fop = &simple_dir_operations; |
| set_nlink(inode, 2); |
| |
| sb->s_root = d_make_root(inode); |
| if (!sb->s_root) |
| goto cleanup; |
| |
| /* Create and populate files in zone groups directories */ |
| for (t = 0; t < ZONEFS_ZTYPE_MAX; t++) { |
| ret = zonefs_create_zgroup(&zd, t); |
| if (ret) |
| break; |
| } |
| |
| cleanup: |
| zonefs_cleanup_zone_info(&zd); |
| |
| return ret; |
| } |
| |
| static struct dentry *zonefs_mount(struct file_system_type *fs_type, |
| int flags, const char *dev_name, void *data) |
| { |
| return mount_bdev(fs_type, flags, dev_name, data, zonefs_fill_super); |
| } |
| |
| static void zonefs_kill_super(struct super_block *sb) |
| { |
| struct zonefs_sb_info *sbi = ZONEFS_SB(sb); |
| |
| if (sb->s_root) |
| d_genocide(sb->s_root); |
| kill_block_super(sb); |
| kfree(sbi); |
| } |
| |
| /* |
| * File system definition and registration. |
| */ |
| static struct file_system_type zonefs_type = { |
| .owner = THIS_MODULE, |
| .name = "zonefs", |
| .mount = zonefs_mount, |
| .kill_sb = zonefs_kill_super, |
| .fs_flags = FS_REQUIRES_DEV, |
| }; |
| |
| static int __init zonefs_init_inodecache(void) |
| { |
| zonefs_inode_cachep = kmem_cache_create("zonefs_inode_cache", |
| sizeof(struct zonefs_inode_info), 0, |
| (SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD | SLAB_ACCOUNT), |
| NULL); |
| if (zonefs_inode_cachep == NULL) |
| return -ENOMEM; |
| return 0; |
| } |
| |
| static void zonefs_destroy_inodecache(void) |
| { |
| /* |
| * Make sure all delayed rcu free inodes are flushed before we |
| * destroy the inode cache. |
| */ |
| rcu_barrier(); |
| kmem_cache_destroy(zonefs_inode_cachep); |
| } |
| |
| static int __init zonefs_init(void) |
| { |
| int ret; |
| |
| BUILD_BUG_ON(sizeof(struct zonefs_super) != ZONEFS_SUPER_SIZE); |
| |
| ret = zonefs_init_inodecache(); |
| if (ret) |
| return ret; |
| |
| ret = register_filesystem(&zonefs_type); |
| if (ret) { |
| zonefs_destroy_inodecache(); |
| return ret; |
| } |
| |
| return 0; |
| } |
| |
| static void __exit zonefs_exit(void) |
| { |
| zonefs_destroy_inodecache(); |
| unregister_filesystem(&zonefs_type); |
| } |
| |
| MODULE_AUTHOR("Damien Le Moal"); |
| MODULE_DESCRIPTION("Zone file system for zoned block devices"); |
| MODULE_LICENSE("GPL"); |
| module_init(zonefs_init); |
| module_exit(zonefs_exit); |