mirror of
https://github.com/torvalds/linux.git
synced 2024-12-14 07:02:23 +00:00
3acbdbf42e
- Simplify the dax_operations API - Eliminate bdev_dax_pgoff() in favor of the filesystem maintaining and applying a partition offset to all its DAX iomap operations. - Remove wrappers and device-mapper stacked callbacks for ->copy_from_iter() and ->copy_to_iter() in favor of moving block_device relative offset responsibility to the dax_direct_access() caller. - Remove the need for an @bdev in filesystem-DAX infrastructure - Remove unused uio helpers copy_from_iter_flushcache() and copy_mc_to_iter() as only the non-check_copy_size() versions are used for DAX. - Prepare XFS for the pending (next merge window) DAX+reflink support - Remove deprecated DEV_DAX_PMEM_COMPAT support - Cleanup a straggling misuse of the GUID api Tags offered after the branch was cut: Reviewed-by: Mike Snitzer <snitzer@redhat.com> Link: https://lore.kernel.org/r/Ydb/3P+8nvjCjYfO@redhat.com -----BEGIN PGP SIGNATURE----- iHUEABYIAB0WIQSbo+XnGs+rwLz9XGXfioYZHlFsZwUCYd3dTAAKCRDfioYZHlFs Z//UAP9zetoTE+O7zJG7CXja4jSopSadbdbh6QKSXaqfKBPvQQD+N4US3wA2bGv8 f/qCY62j2Hj3hUTGHs9RvTyw3JsSYAA= =QvDs -----END PGP SIGNATURE----- Merge tag 'libnvdimm-for-5.17' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm Pull dax and libnvdimm updates from Dan Williams: "The bulk of this is a rework of the dax_operations API after discovering the obstacles it posed to the work-in-progress DAX+reflink support for XFS and other copy-on-write filesystem mechanics. Primarily the need to plumb a block_device through the API to handle partition offsets was a sticking point and Christoph untangled that dependency in addition to other cleanups to make landing the DAX+reflink support easier. The DAX_PMEM_COMPAT option has been around for 4 years and not only are distributions shipping userspace that understand the current configuration API, but some are not even bothering to turn this option on anymore, so it seems a good time to remove it per the deprecation schedule. Recall that this was added after the device-dax subsystem moved from /sys/class/dax to /sys/bus/dax for its sysfs organization. All recent functionality depends on /sys/bus/dax. Some other miscellaneous cleanups and reflink prep patches are included as well. Summary: - Simplify the dax_operations API: - Eliminate bdev_dax_pgoff() in favor of the filesystem maintaining and applying a partition offset to all its DAX iomap operations. - Remove wrappers and device-mapper stacked callbacks for ->copy_from_iter() and ->copy_to_iter() in favor of moving block_device relative offset responsibility to the dax_direct_access() caller. - Remove the need for an @bdev in filesystem-DAX infrastructure - Remove unused uio helpers copy_from_iter_flushcache() and copy_mc_to_iter() as only the non-check_copy_size() versions are used for DAX. - Prepare XFS for the pending (next merge window) DAX+reflink support - Remove deprecated DEV_DAX_PMEM_COMPAT support - Cleanup a straggling misuse of the GUID api" * tag 'libnvdimm-for-5.17' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm: (38 commits) iomap: Fix error handling in iomap_zero_iter() ACPI: NFIT: Import GUID before use dax: remove the copy_from_iter and copy_to_iter methods dax: remove the DAXDEV_F_SYNC flag dax: simplify dax_synchronous and set_dax_synchronous uio: remove copy_from_iter_flushcache() and copy_mc_to_iter() iomap: turn the byte variable in iomap_zero_iter into a ssize_t memremap: remove support for external pgmap refcounts fsdax: don't require CONFIG_BLOCK iomap: build the block based code conditionally dax: fix up some of the block device related ifdefs fsdax: shift partition offset handling into the file systems dax: return the partition offset from fs_dax_get_by_bdev iomap: add a IOMAP_DAX flag xfs: pass the mapping flags to xfs_bmbt_to_iomap xfs: use xfs_direct_write_iomap_ops for DAX zeroing xfs: move dax device handling into xfs_{alloc,free}_buftarg ext4: cleanup the dax handling in ext4_fill_super ext2: cleanup the dax handling in ext2_fill_super fsdax: decouple zeroing from the iomap buffered I/O code ...
922 lines
22 KiB
C
922 lines
22 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2017-2018 HUAWEI, Inc.
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* https://www.huawei.com/
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* Copyright (C) 2021, Alibaba Cloud
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*/
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#include <linux/module.h>
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#include <linux/buffer_head.h>
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#include <linux/statfs.h>
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#include <linux/parser.h>
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#include <linux/seq_file.h>
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#include <linux/crc32c.h>
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#include <linux/fs_context.h>
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#include <linux/fs_parser.h>
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#include <linux/dax.h>
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#include "xattr.h"
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#define CREATE_TRACE_POINTS
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#include <trace/events/erofs.h>
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static struct kmem_cache *erofs_inode_cachep __read_mostly;
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void _erofs_err(struct super_block *sb, const char *function,
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const char *fmt, ...)
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{
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struct va_format vaf;
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va_list args;
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va_start(args, fmt);
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vaf.fmt = fmt;
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vaf.va = &args;
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pr_err("(device %s): %s: %pV", sb->s_id, function, &vaf);
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va_end(args);
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}
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void _erofs_info(struct super_block *sb, const char *function,
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const char *fmt, ...)
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{
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struct va_format vaf;
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va_list args;
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va_start(args, fmt);
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vaf.fmt = fmt;
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vaf.va = &args;
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pr_info("(device %s): %pV", sb->s_id, &vaf);
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va_end(args);
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}
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static int erofs_superblock_csum_verify(struct super_block *sb, void *sbdata)
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{
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struct erofs_super_block *dsb;
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u32 expected_crc, crc;
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dsb = kmemdup(sbdata + EROFS_SUPER_OFFSET,
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EROFS_BLKSIZ - EROFS_SUPER_OFFSET, GFP_KERNEL);
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if (!dsb)
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return -ENOMEM;
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expected_crc = le32_to_cpu(dsb->checksum);
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dsb->checksum = 0;
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/* to allow for x86 boot sectors and other oddities. */
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crc = crc32c(~0, dsb, EROFS_BLKSIZ - EROFS_SUPER_OFFSET);
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kfree(dsb);
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if (crc != expected_crc) {
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erofs_err(sb, "invalid checksum 0x%08x, 0x%08x expected",
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crc, expected_crc);
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return -EBADMSG;
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}
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return 0;
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}
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static void erofs_inode_init_once(void *ptr)
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{
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struct erofs_inode *vi = ptr;
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inode_init_once(&vi->vfs_inode);
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}
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static struct inode *erofs_alloc_inode(struct super_block *sb)
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{
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struct erofs_inode *vi =
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kmem_cache_alloc(erofs_inode_cachep, GFP_KERNEL);
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if (!vi)
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return NULL;
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/* zero out everything except vfs_inode */
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memset(vi, 0, offsetof(struct erofs_inode, vfs_inode));
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return &vi->vfs_inode;
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}
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static void erofs_free_inode(struct inode *inode)
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{
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struct erofs_inode *vi = EROFS_I(inode);
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/* be careful of RCU symlink path */
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if (inode->i_op == &erofs_fast_symlink_iops)
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kfree(inode->i_link);
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kfree(vi->xattr_shared_xattrs);
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kmem_cache_free(erofs_inode_cachep, vi);
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}
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static bool check_layout_compatibility(struct super_block *sb,
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struct erofs_super_block *dsb)
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{
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const unsigned int feature = le32_to_cpu(dsb->feature_incompat);
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EROFS_SB(sb)->feature_incompat = feature;
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/* check if current kernel meets all mandatory requirements */
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if (feature & (~EROFS_ALL_FEATURE_INCOMPAT)) {
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erofs_err(sb,
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"unidentified incompatible feature %x, please upgrade kernel version",
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feature & ~EROFS_ALL_FEATURE_INCOMPAT);
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return false;
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}
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return true;
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}
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#ifdef CONFIG_EROFS_FS_ZIP
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/* read variable-sized metadata, offset will be aligned by 4-byte */
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static void *erofs_read_metadata(struct super_block *sb, struct erofs_buf *buf,
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erofs_off_t *offset, int *lengthp)
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{
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u8 *buffer, *ptr;
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int len, i, cnt;
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*offset = round_up(*offset, 4);
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ptr = erofs_read_metabuf(buf, sb, erofs_blknr(*offset), EROFS_KMAP);
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if (IS_ERR(ptr))
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return ptr;
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len = le16_to_cpu(*(__le16 *)&ptr[erofs_blkoff(*offset)]);
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if (!len)
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len = U16_MAX + 1;
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buffer = kmalloc(len, GFP_KERNEL);
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if (!buffer)
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return ERR_PTR(-ENOMEM);
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*offset += sizeof(__le16);
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*lengthp = len;
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for (i = 0; i < len; i += cnt) {
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cnt = min(EROFS_BLKSIZ - (int)erofs_blkoff(*offset), len - i);
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ptr = erofs_read_metabuf(buf, sb, erofs_blknr(*offset),
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EROFS_KMAP);
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if (IS_ERR(ptr)) {
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kfree(buffer);
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return ptr;
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}
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memcpy(buffer + i, ptr + erofs_blkoff(*offset), cnt);
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*offset += cnt;
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}
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return buffer;
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}
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static int erofs_load_compr_cfgs(struct super_block *sb,
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struct erofs_super_block *dsb)
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{
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struct erofs_sb_info *sbi = EROFS_SB(sb);
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struct erofs_buf buf = __EROFS_BUF_INITIALIZER;
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unsigned int algs, alg;
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erofs_off_t offset;
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int size, ret = 0;
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sbi->available_compr_algs = le16_to_cpu(dsb->u1.available_compr_algs);
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if (sbi->available_compr_algs & ~Z_EROFS_ALL_COMPR_ALGS) {
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erofs_err(sb, "try to load compressed fs with unsupported algorithms %x",
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sbi->available_compr_algs & ~Z_EROFS_ALL_COMPR_ALGS);
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return -EINVAL;
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}
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offset = EROFS_SUPER_OFFSET + sbi->sb_size;
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alg = 0;
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for (algs = sbi->available_compr_algs; algs; algs >>= 1, ++alg) {
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void *data;
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if (!(algs & 1))
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continue;
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data = erofs_read_metadata(sb, &buf, &offset, &size);
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if (IS_ERR(data)) {
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ret = PTR_ERR(data);
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break;
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}
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switch (alg) {
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case Z_EROFS_COMPRESSION_LZ4:
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ret = z_erofs_load_lz4_config(sb, dsb, data, size);
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break;
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case Z_EROFS_COMPRESSION_LZMA:
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ret = z_erofs_load_lzma_config(sb, dsb, data, size);
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break;
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default:
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DBG_BUGON(1);
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ret = -EFAULT;
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}
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kfree(data);
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if (ret)
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break;
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}
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erofs_put_metabuf(&buf);
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return ret;
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}
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#else
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static int erofs_load_compr_cfgs(struct super_block *sb,
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struct erofs_super_block *dsb)
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{
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if (dsb->u1.available_compr_algs) {
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erofs_err(sb, "try to load compressed fs when compression is disabled");
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return -EINVAL;
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}
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return 0;
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}
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#endif
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static int erofs_init_devices(struct super_block *sb,
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struct erofs_super_block *dsb)
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{
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struct erofs_sb_info *sbi = EROFS_SB(sb);
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unsigned int ondisk_extradevs;
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erofs_off_t pos;
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struct erofs_buf buf = __EROFS_BUF_INITIALIZER;
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struct erofs_device_info *dif;
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struct erofs_deviceslot *dis;
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void *ptr;
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int id, err = 0;
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sbi->total_blocks = sbi->primarydevice_blocks;
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if (!erofs_sb_has_device_table(sbi))
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ondisk_extradevs = 0;
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else
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ondisk_extradevs = le16_to_cpu(dsb->extra_devices);
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if (ondisk_extradevs != sbi->devs->extra_devices) {
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erofs_err(sb, "extra devices don't match (ondisk %u, given %u)",
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ondisk_extradevs, sbi->devs->extra_devices);
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return -EINVAL;
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}
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if (!ondisk_extradevs)
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return 0;
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sbi->device_id_mask = roundup_pow_of_two(ondisk_extradevs + 1) - 1;
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pos = le16_to_cpu(dsb->devt_slotoff) * EROFS_DEVT_SLOT_SIZE;
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down_read(&sbi->devs->rwsem);
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idr_for_each_entry(&sbi->devs->tree, dif, id) {
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struct block_device *bdev;
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ptr = erofs_read_metabuf(&buf, sb, erofs_blknr(pos),
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EROFS_KMAP);
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if (IS_ERR(ptr)) {
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err = PTR_ERR(ptr);
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break;
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}
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dis = ptr + erofs_blkoff(pos);
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bdev = blkdev_get_by_path(dif->path,
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FMODE_READ | FMODE_EXCL,
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sb->s_type);
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if (IS_ERR(bdev)) {
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err = PTR_ERR(bdev);
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break;
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}
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dif->bdev = bdev;
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dif->dax_dev = fs_dax_get_by_bdev(bdev, &dif->dax_part_off);
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dif->blocks = le32_to_cpu(dis->blocks);
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dif->mapped_blkaddr = le32_to_cpu(dis->mapped_blkaddr);
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sbi->total_blocks += dif->blocks;
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pos += EROFS_DEVT_SLOT_SIZE;
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}
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up_read(&sbi->devs->rwsem);
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erofs_put_metabuf(&buf);
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return err;
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}
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static int erofs_read_superblock(struct super_block *sb)
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{
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struct erofs_sb_info *sbi;
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struct page *page;
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struct erofs_super_block *dsb;
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unsigned int blkszbits;
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void *data;
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int ret;
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page = read_mapping_page(sb->s_bdev->bd_inode->i_mapping, 0, NULL);
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if (IS_ERR(page)) {
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erofs_err(sb, "cannot read erofs superblock");
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return PTR_ERR(page);
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}
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sbi = EROFS_SB(sb);
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data = kmap(page);
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dsb = (struct erofs_super_block *)(data + EROFS_SUPER_OFFSET);
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ret = -EINVAL;
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if (le32_to_cpu(dsb->magic) != EROFS_SUPER_MAGIC_V1) {
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erofs_err(sb, "cannot find valid erofs superblock");
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goto out;
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}
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sbi->feature_compat = le32_to_cpu(dsb->feature_compat);
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if (erofs_sb_has_sb_chksum(sbi)) {
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ret = erofs_superblock_csum_verify(sb, data);
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if (ret)
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goto out;
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}
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ret = -EINVAL;
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blkszbits = dsb->blkszbits;
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/* 9(512 bytes) + LOG_SECTORS_PER_BLOCK == LOG_BLOCK_SIZE */
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if (blkszbits != LOG_BLOCK_SIZE) {
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erofs_err(sb, "blkszbits %u isn't supported on this platform",
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blkszbits);
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goto out;
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}
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if (!check_layout_compatibility(sb, dsb))
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goto out;
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sbi->sb_size = 128 + dsb->sb_extslots * EROFS_SB_EXTSLOT_SIZE;
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if (sbi->sb_size > EROFS_BLKSIZ) {
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erofs_err(sb, "invalid sb_extslots %u (more than a fs block)",
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sbi->sb_size);
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goto out;
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}
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sbi->primarydevice_blocks = le32_to_cpu(dsb->blocks);
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sbi->meta_blkaddr = le32_to_cpu(dsb->meta_blkaddr);
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#ifdef CONFIG_EROFS_FS_XATTR
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sbi->xattr_blkaddr = le32_to_cpu(dsb->xattr_blkaddr);
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#endif
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sbi->islotbits = ilog2(sizeof(struct erofs_inode_compact));
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sbi->root_nid = le16_to_cpu(dsb->root_nid);
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sbi->inos = le64_to_cpu(dsb->inos);
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sbi->build_time = le64_to_cpu(dsb->build_time);
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sbi->build_time_nsec = le32_to_cpu(dsb->build_time_nsec);
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memcpy(&sb->s_uuid, dsb->uuid, sizeof(dsb->uuid));
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ret = strscpy(sbi->volume_name, dsb->volume_name,
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sizeof(dsb->volume_name));
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if (ret < 0) { /* -E2BIG */
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erofs_err(sb, "bad volume name without NIL terminator");
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ret = -EFSCORRUPTED;
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goto out;
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}
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/* parse on-disk compression configurations */
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if (erofs_sb_has_compr_cfgs(sbi))
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ret = erofs_load_compr_cfgs(sb, dsb);
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else
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ret = z_erofs_load_lz4_config(sb, dsb, NULL, 0);
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if (ret < 0)
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goto out;
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/* handle multiple devices */
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ret = erofs_init_devices(sb, dsb);
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if (erofs_sb_has_ztailpacking(sbi))
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erofs_info(sb, "EXPERIMENTAL compressed inline data feature in use. Use at your own risk!");
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out:
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kunmap(page);
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put_page(page);
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return ret;
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}
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/* set up default EROFS parameters */
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static void erofs_default_options(struct erofs_fs_context *ctx)
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{
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#ifdef CONFIG_EROFS_FS_ZIP
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ctx->opt.cache_strategy = EROFS_ZIP_CACHE_READAROUND;
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ctx->opt.max_sync_decompress_pages = 3;
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ctx->opt.sync_decompress = EROFS_SYNC_DECOMPRESS_AUTO;
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#endif
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#ifdef CONFIG_EROFS_FS_XATTR
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set_opt(&ctx->opt, XATTR_USER);
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#endif
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#ifdef CONFIG_EROFS_FS_POSIX_ACL
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set_opt(&ctx->opt, POSIX_ACL);
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#endif
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}
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enum {
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Opt_user_xattr,
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Opt_acl,
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Opt_cache_strategy,
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Opt_dax,
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Opt_dax_enum,
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Opt_device,
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Opt_err
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};
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static const struct constant_table erofs_param_cache_strategy[] = {
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{"disabled", EROFS_ZIP_CACHE_DISABLED},
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{"readahead", EROFS_ZIP_CACHE_READAHEAD},
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{"readaround", EROFS_ZIP_CACHE_READAROUND},
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{}
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};
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static const struct constant_table erofs_dax_param_enums[] = {
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{"always", EROFS_MOUNT_DAX_ALWAYS},
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{"never", EROFS_MOUNT_DAX_NEVER},
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{}
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};
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static const struct fs_parameter_spec erofs_fs_parameters[] = {
|
|
fsparam_flag_no("user_xattr", Opt_user_xattr),
|
|
fsparam_flag_no("acl", Opt_acl),
|
|
fsparam_enum("cache_strategy", Opt_cache_strategy,
|
|
erofs_param_cache_strategy),
|
|
fsparam_flag("dax", Opt_dax),
|
|
fsparam_enum("dax", Opt_dax_enum, erofs_dax_param_enums),
|
|
fsparam_string("device", Opt_device),
|
|
{}
|
|
};
|
|
|
|
static bool erofs_fc_set_dax_mode(struct fs_context *fc, unsigned int mode)
|
|
{
|
|
#ifdef CONFIG_FS_DAX
|
|
struct erofs_fs_context *ctx = fc->fs_private;
|
|
|
|
switch (mode) {
|
|
case EROFS_MOUNT_DAX_ALWAYS:
|
|
warnfc(fc, "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
|
|
set_opt(&ctx->opt, DAX_ALWAYS);
|
|
clear_opt(&ctx->opt, DAX_NEVER);
|
|
return true;
|
|
case EROFS_MOUNT_DAX_NEVER:
|
|
set_opt(&ctx->opt, DAX_NEVER);
|
|
clear_opt(&ctx->opt, DAX_ALWAYS);
|
|
return true;
|
|
default:
|
|
DBG_BUGON(1);
|
|
return false;
|
|
}
|
|
#else
|
|
errorfc(fc, "dax options not supported");
|
|
return false;
|
|
#endif
|
|
}
|
|
|
|
static int erofs_fc_parse_param(struct fs_context *fc,
|
|
struct fs_parameter *param)
|
|
{
|
|
struct erofs_fs_context *ctx = fc->fs_private;
|
|
struct fs_parse_result result;
|
|
struct erofs_device_info *dif;
|
|
int opt, ret;
|
|
|
|
opt = fs_parse(fc, erofs_fs_parameters, param, &result);
|
|
if (opt < 0)
|
|
return opt;
|
|
|
|
switch (opt) {
|
|
case Opt_user_xattr:
|
|
#ifdef CONFIG_EROFS_FS_XATTR
|
|
if (result.boolean)
|
|
set_opt(&ctx->opt, XATTR_USER);
|
|
else
|
|
clear_opt(&ctx->opt, XATTR_USER);
|
|
#else
|
|
errorfc(fc, "{,no}user_xattr options not supported");
|
|
#endif
|
|
break;
|
|
case Opt_acl:
|
|
#ifdef CONFIG_EROFS_FS_POSIX_ACL
|
|
if (result.boolean)
|
|
set_opt(&ctx->opt, POSIX_ACL);
|
|
else
|
|
clear_opt(&ctx->opt, POSIX_ACL);
|
|
#else
|
|
errorfc(fc, "{,no}acl options not supported");
|
|
#endif
|
|
break;
|
|
case Opt_cache_strategy:
|
|
#ifdef CONFIG_EROFS_FS_ZIP
|
|
ctx->opt.cache_strategy = result.uint_32;
|
|
#else
|
|
errorfc(fc, "compression not supported, cache_strategy ignored");
|
|
#endif
|
|
break;
|
|
case Opt_dax:
|
|
if (!erofs_fc_set_dax_mode(fc, EROFS_MOUNT_DAX_ALWAYS))
|
|
return -EINVAL;
|
|
break;
|
|
case Opt_dax_enum:
|
|
if (!erofs_fc_set_dax_mode(fc, result.uint_32))
|
|
return -EINVAL;
|
|
break;
|
|
case Opt_device:
|
|
dif = kzalloc(sizeof(*dif), GFP_KERNEL);
|
|
if (!dif)
|
|
return -ENOMEM;
|
|
dif->path = kstrdup(param->string, GFP_KERNEL);
|
|
if (!dif->path) {
|
|
kfree(dif);
|
|
return -ENOMEM;
|
|
}
|
|
down_write(&ctx->devs->rwsem);
|
|
ret = idr_alloc(&ctx->devs->tree, dif, 0, 0, GFP_KERNEL);
|
|
up_write(&ctx->devs->rwsem);
|
|
if (ret < 0) {
|
|
kfree(dif->path);
|
|
kfree(dif);
|
|
return ret;
|
|
}
|
|
++ctx->devs->extra_devices;
|
|
break;
|
|
default:
|
|
return -ENOPARAM;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_EROFS_FS_ZIP
|
|
static const struct address_space_operations managed_cache_aops;
|
|
|
|
static int erofs_managed_cache_releasepage(struct page *page, gfp_t gfp_mask)
|
|
{
|
|
int ret = 1; /* 0 - busy */
|
|
struct address_space *const mapping = page->mapping;
|
|
|
|
DBG_BUGON(!PageLocked(page));
|
|
DBG_BUGON(mapping->a_ops != &managed_cache_aops);
|
|
|
|
if (PagePrivate(page))
|
|
ret = erofs_try_to_free_cached_page(page);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void erofs_managed_cache_invalidatepage(struct page *page,
|
|
unsigned int offset,
|
|
unsigned int length)
|
|
{
|
|
const unsigned int stop = length + offset;
|
|
|
|
DBG_BUGON(!PageLocked(page));
|
|
|
|
/* Check for potential overflow in debug mode */
|
|
DBG_BUGON(stop > PAGE_SIZE || stop < length);
|
|
|
|
if (offset == 0 && stop == PAGE_SIZE)
|
|
while (!erofs_managed_cache_releasepage(page, GFP_NOFS))
|
|
cond_resched();
|
|
}
|
|
|
|
static const struct address_space_operations managed_cache_aops = {
|
|
.releasepage = erofs_managed_cache_releasepage,
|
|
.invalidatepage = erofs_managed_cache_invalidatepage,
|
|
};
|
|
|
|
static int erofs_init_managed_cache(struct super_block *sb)
|
|
{
|
|
struct erofs_sb_info *const sbi = EROFS_SB(sb);
|
|
struct inode *const inode = new_inode(sb);
|
|
|
|
if (!inode)
|
|
return -ENOMEM;
|
|
|
|
set_nlink(inode, 1);
|
|
inode->i_size = OFFSET_MAX;
|
|
|
|
inode->i_mapping->a_ops = &managed_cache_aops;
|
|
mapping_set_gfp_mask(inode->i_mapping,
|
|
GFP_NOFS | __GFP_HIGHMEM | __GFP_MOVABLE);
|
|
sbi->managed_cache = inode;
|
|
return 0;
|
|
}
|
|
#else
|
|
static int erofs_init_managed_cache(struct super_block *sb) { return 0; }
|
|
#endif
|
|
|
|
static int erofs_fc_fill_super(struct super_block *sb, struct fs_context *fc)
|
|
{
|
|
struct inode *inode;
|
|
struct erofs_sb_info *sbi;
|
|
struct erofs_fs_context *ctx = fc->fs_private;
|
|
int err;
|
|
|
|
sb->s_magic = EROFS_SUPER_MAGIC;
|
|
|
|
if (!sb_set_blocksize(sb, EROFS_BLKSIZ)) {
|
|
erofs_err(sb, "failed to set erofs blksize");
|
|
return -EINVAL;
|
|
}
|
|
|
|
sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
|
|
if (!sbi)
|
|
return -ENOMEM;
|
|
|
|
sb->s_fs_info = sbi;
|
|
sbi->opt = ctx->opt;
|
|
sbi->dax_dev = fs_dax_get_by_bdev(sb->s_bdev, &sbi->dax_part_off);
|
|
sbi->devs = ctx->devs;
|
|
ctx->devs = NULL;
|
|
|
|
err = erofs_read_superblock(sb);
|
|
if (err)
|
|
return err;
|
|
|
|
if (test_opt(&sbi->opt, DAX_ALWAYS)) {
|
|
BUILD_BUG_ON(EROFS_BLKSIZ != PAGE_SIZE);
|
|
|
|
if (!sbi->dax_dev) {
|
|
errorfc(fc, "DAX unsupported by block device. Turning off DAX.");
|
|
clear_opt(&sbi->opt, DAX_ALWAYS);
|
|
}
|
|
}
|
|
sb->s_flags |= SB_RDONLY | SB_NOATIME;
|
|
sb->s_maxbytes = MAX_LFS_FILESIZE;
|
|
sb->s_time_gran = 1;
|
|
|
|
sb->s_op = &erofs_sops;
|
|
sb->s_xattr = erofs_xattr_handlers;
|
|
|
|
if (test_opt(&sbi->opt, POSIX_ACL))
|
|
sb->s_flags |= SB_POSIXACL;
|
|
else
|
|
sb->s_flags &= ~SB_POSIXACL;
|
|
|
|
#ifdef CONFIG_EROFS_FS_ZIP
|
|
xa_init(&sbi->managed_pslots);
|
|
#endif
|
|
|
|
/* get the root inode */
|
|
inode = erofs_iget(sb, ROOT_NID(sbi), true);
|
|
if (IS_ERR(inode))
|
|
return PTR_ERR(inode);
|
|
|
|
if (!S_ISDIR(inode->i_mode)) {
|
|
erofs_err(sb, "rootino(nid %llu) is not a directory(i_mode %o)",
|
|
ROOT_NID(sbi), inode->i_mode);
|
|
iput(inode);
|
|
return -EINVAL;
|
|
}
|
|
|
|
sb->s_root = d_make_root(inode);
|
|
if (!sb->s_root)
|
|
return -ENOMEM;
|
|
|
|
erofs_shrinker_register(sb);
|
|
/* sb->s_umount is already locked, SB_ACTIVE and SB_BORN are not set */
|
|
err = erofs_init_managed_cache(sb);
|
|
if (err)
|
|
return err;
|
|
|
|
err = erofs_register_sysfs(sb);
|
|
if (err)
|
|
return err;
|
|
|
|
erofs_info(sb, "mounted with root inode @ nid %llu.", ROOT_NID(sbi));
|
|
return 0;
|
|
}
|
|
|
|
static int erofs_fc_get_tree(struct fs_context *fc)
|
|
{
|
|
return get_tree_bdev(fc, erofs_fc_fill_super);
|
|
}
|
|
|
|
static int erofs_fc_reconfigure(struct fs_context *fc)
|
|
{
|
|
struct super_block *sb = fc->root->d_sb;
|
|
struct erofs_sb_info *sbi = EROFS_SB(sb);
|
|
struct erofs_fs_context *ctx = fc->fs_private;
|
|
|
|
DBG_BUGON(!sb_rdonly(sb));
|
|
|
|
if (test_opt(&ctx->opt, POSIX_ACL))
|
|
fc->sb_flags |= SB_POSIXACL;
|
|
else
|
|
fc->sb_flags &= ~SB_POSIXACL;
|
|
|
|
sbi->opt = ctx->opt;
|
|
|
|
fc->sb_flags |= SB_RDONLY;
|
|
return 0;
|
|
}
|
|
|
|
static int erofs_release_device_info(int id, void *ptr, void *data)
|
|
{
|
|
struct erofs_device_info *dif = ptr;
|
|
|
|
fs_put_dax(dif->dax_dev);
|
|
if (dif->bdev)
|
|
blkdev_put(dif->bdev, FMODE_READ | FMODE_EXCL);
|
|
kfree(dif->path);
|
|
kfree(dif);
|
|
return 0;
|
|
}
|
|
|
|
static void erofs_free_dev_context(struct erofs_dev_context *devs)
|
|
{
|
|
if (!devs)
|
|
return;
|
|
idr_for_each(&devs->tree, &erofs_release_device_info, NULL);
|
|
idr_destroy(&devs->tree);
|
|
kfree(devs);
|
|
}
|
|
|
|
static void erofs_fc_free(struct fs_context *fc)
|
|
{
|
|
struct erofs_fs_context *ctx = fc->fs_private;
|
|
|
|
erofs_free_dev_context(ctx->devs);
|
|
kfree(ctx);
|
|
}
|
|
|
|
static const struct fs_context_operations erofs_context_ops = {
|
|
.parse_param = erofs_fc_parse_param,
|
|
.get_tree = erofs_fc_get_tree,
|
|
.reconfigure = erofs_fc_reconfigure,
|
|
.free = erofs_fc_free,
|
|
};
|
|
|
|
static int erofs_init_fs_context(struct fs_context *fc)
|
|
{
|
|
struct erofs_fs_context *ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
|
|
|
|
if (!ctx)
|
|
return -ENOMEM;
|
|
ctx->devs = kzalloc(sizeof(struct erofs_dev_context), GFP_KERNEL);
|
|
if (!ctx->devs) {
|
|
kfree(ctx);
|
|
return -ENOMEM;
|
|
}
|
|
fc->fs_private = ctx;
|
|
|
|
idr_init(&ctx->devs->tree);
|
|
init_rwsem(&ctx->devs->rwsem);
|
|
erofs_default_options(ctx);
|
|
fc->ops = &erofs_context_ops;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* could be triggered after deactivate_locked_super()
|
|
* is called, thus including umount and failed to initialize.
|
|
*/
|
|
static void erofs_kill_sb(struct super_block *sb)
|
|
{
|
|
struct erofs_sb_info *sbi;
|
|
|
|
WARN_ON(sb->s_magic != EROFS_SUPER_MAGIC);
|
|
|
|
kill_block_super(sb);
|
|
|
|
sbi = EROFS_SB(sb);
|
|
if (!sbi)
|
|
return;
|
|
|
|
erofs_free_dev_context(sbi->devs);
|
|
fs_put_dax(sbi->dax_dev);
|
|
kfree(sbi);
|
|
sb->s_fs_info = NULL;
|
|
}
|
|
|
|
/* called when ->s_root is non-NULL */
|
|
static void erofs_put_super(struct super_block *sb)
|
|
{
|
|
struct erofs_sb_info *const sbi = EROFS_SB(sb);
|
|
|
|
DBG_BUGON(!sbi);
|
|
|
|
erofs_unregister_sysfs(sb);
|
|
erofs_shrinker_unregister(sb);
|
|
#ifdef CONFIG_EROFS_FS_ZIP
|
|
iput(sbi->managed_cache);
|
|
sbi->managed_cache = NULL;
|
|
#endif
|
|
}
|
|
|
|
static struct file_system_type erofs_fs_type = {
|
|
.owner = THIS_MODULE,
|
|
.name = "erofs",
|
|
.init_fs_context = erofs_init_fs_context,
|
|
.kill_sb = erofs_kill_sb,
|
|
.fs_flags = FS_REQUIRES_DEV,
|
|
};
|
|
MODULE_ALIAS_FS("erofs");
|
|
|
|
static int __init erofs_module_init(void)
|
|
{
|
|
int err;
|
|
|
|
erofs_check_ondisk_layout_definitions();
|
|
|
|
erofs_inode_cachep = kmem_cache_create("erofs_inode",
|
|
sizeof(struct erofs_inode), 0,
|
|
SLAB_RECLAIM_ACCOUNT,
|
|
erofs_inode_init_once);
|
|
if (!erofs_inode_cachep) {
|
|
err = -ENOMEM;
|
|
goto icache_err;
|
|
}
|
|
|
|
err = erofs_init_shrinker();
|
|
if (err)
|
|
goto shrinker_err;
|
|
|
|
err = z_erofs_lzma_init();
|
|
if (err)
|
|
goto lzma_err;
|
|
|
|
erofs_pcpubuf_init();
|
|
err = z_erofs_init_zip_subsystem();
|
|
if (err)
|
|
goto zip_err;
|
|
|
|
err = erofs_init_sysfs();
|
|
if (err)
|
|
goto sysfs_err;
|
|
|
|
err = register_filesystem(&erofs_fs_type);
|
|
if (err)
|
|
goto fs_err;
|
|
|
|
return 0;
|
|
|
|
fs_err:
|
|
erofs_exit_sysfs();
|
|
sysfs_err:
|
|
z_erofs_exit_zip_subsystem();
|
|
zip_err:
|
|
z_erofs_lzma_exit();
|
|
lzma_err:
|
|
erofs_exit_shrinker();
|
|
shrinker_err:
|
|
kmem_cache_destroy(erofs_inode_cachep);
|
|
icache_err:
|
|
return err;
|
|
}
|
|
|
|
static void __exit erofs_module_exit(void)
|
|
{
|
|
unregister_filesystem(&erofs_fs_type);
|
|
|
|
/* Ensure all RCU free inodes / pclusters are safe to be destroyed. */
|
|
rcu_barrier();
|
|
|
|
erofs_exit_sysfs();
|
|
z_erofs_exit_zip_subsystem();
|
|
z_erofs_lzma_exit();
|
|
erofs_exit_shrinker();
|
|
kmem_cache_destroy(erofs_inode_cachep);
|
|
erofs_pcpubuf_exit();
|
|
}
|
|
|
|
/* get filesystem statistics */
|
|
static int erofs_statfs(struct dentry *dentry, struct kstatfs *buf)
|
|
{
|
|
struct super_block *sb = dentry->d_sb;
|
|
struct erofs_sb_info *sbi = EROFS_SB(sb);
|
|
u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
|
|
|
|
buf->f_type = sb->s_magic;
|
|
buf->f_bsize = EROFS_BLKSIZ;
|
|
buf->f_blocks = sbi->total_blocks;
|
|
buf->f_bfree = buf->f_bavail = 0;
|
|
|
|
buf->f_files = ULLONG_MAX;
|
|
buf->f_ffree = ULLONG_MAX - sbi->inos;
|
|
|
|
buf->f_namelen = EROFS_NAME_LEN;
|
|
|
|
buf->f_fsid = u64_to_fsid(id);
|
|
return 0;
|
|
}
|
|
|
|
static int erofs_show_options(struct seq_file *seq, struct dentry *root)
|
|
{
|
|
struct erofs_sb_info *sbi = EROFS_SB(root->d_sb);
|
|
struct erofs_mount_opts *opt = &sbi->opt;
|
|
|
|
#ifdef CONFIG_EROFS_FS_XATTR
|
|
if (test_opt(opt, XATTR_USER))
|
|
seq_puts(seq, ",user_xattr");
|
|
else
|
|
seq_puts(seq, ",nouser_xattr");
|
|
#endif
|
|
#ifdef CONFIG_EROFS_FS_POSIX_ACL
|
|
if (test_opt(opt, POSIX_ACL))
|
|
seq_puts(seq, ",acl");
|
|
else
|
|
seq_puts(seq, ",noacl");
|
|
#endif
|
|
#ifdef CONFIG_EROFS_FS_ZIP
|
|
if (opt->cache_strategy == EROFS_ZIP_CACHE_DISABLED)
|
|
seq_puts(seq, ",cache_strategy=disabled");
|
|
else if (opt->cache_strategy == EROFS_ZIP_CACHE_READAHEAD)
|
|
seq_puts(seq, ",cache_strategy=readahead");
|
|
else if (opt->cache_strategy == EROFS_ZIP_CACHE_READAROUND)
|
|
seq_puts(seq, ",cache_strategy=readaround");
|
|
#endif
|
|
if (test_opt(opt, DAX_ALWAYS))
|
|
seq_puts(seq, ",dax=always");
|
|
if (test_opt(opt, DAX_NEVER))
|
|
seq_puts(seq, ",dax=never");
|
|
return 0;
|
|
}
|
|
|
|
const struct super_operations erofs_sops = {
|
|
.put_super = erofs_put_super,
|
|
.alloc_inode = erofs_alloc_inode,
|
|
.free_inode = erofs_free_inode,
|
|
.statfs = erofs_statfs,
|
|
.show_options = erofs_show_options,
|
|
};
|
|
|
|
module_init(erofs_module_init);
|
|
module_exit(erofs_module_exit);
|
|
|
|
MODULE_DESCRIPTION("Enhanced ROM File System");
|
|
MODULE_AUTHOR("Gao Xiang, Chao Yu, Miao Xie, CONSUMER BG, HUAWEI Inc.");
|
|
MODULE_LICENSE("GPL");
|