mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-27 11:19:37 +00:00
![sunshijie](/assets/img/avatar_default.png)
The `dedupe` and `fragments` features have been merged for a year. They are mostly stable now. Reviewed-by: Gao Xiang <hsiangkao@linux.alibaba.com> Reviewed-by: Chao Yu <chao@kernel.org> Signed-off-by: sunshijie <sunshijie@xiaomi.com> Link: https://lore.kernel.org/r/20230821041737.2673401-1-sunshijie@xiaomi.com Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
1077 lines
25 KiB
C
1077 lines
25 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/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 <linux/exportfs.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 *func, 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, func, &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 *func, 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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size_t len = 1 << EROFS_SB(sb)->blkszbits;
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struct erofs_super_block *dsb;
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u32 expected_crc, crc;
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if (len > EROFS_SUPER_OFFSET)
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len -= EROFS_SUPER_OFFSET;
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dsb = kmemdup(sbdata + EROFS_SUPER_OFFSET, len, 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, len);
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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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alloc_inode_sb(sb, 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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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, "unidentified incompatible feature %x, please upgrade kernel",
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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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/* read variable-sized metadata, offset will be aligned by 4-byte */
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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_bread(buf, erofs_blknr(sb, *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(sb, *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_t(int, sb->s_blocksize - erofs_blkoff(sb, *offset),
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len - i);
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ptr = erofs_bread(buf, erofs_blknr(sb, *offset), 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(sb, *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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#ifdef CONFIG_EROFS_FS_ZIP
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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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erofs_init_metabuf(&buf, sb);
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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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case Z_EROFS_COMPRESSION_DEFLATE:
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ret = z_erofs_load_deflate_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_device(struct erofs_buf *buf, struct super_block *sb,
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struct erofs_device_info *dif, erofs_off_t *pos)
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{
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struct erofs_sb_info *sbi = EROFS_SB(sb);
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struct erofs_fscache *fscache;
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struct erofs_deviceslot *dis;
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struct block_device *bdev;
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void *ptr;
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ptr = erofs_read_metabuf(buf, sb, erofs_blknr(sb, *pos), EROFS_KMAP);
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if (IS_ERR(ptr))
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return PTR_ERR(ptr);
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dis = ptr + erofs_blkoff(sb, *pos);
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if (!dif->path) {
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if (!dis->tag[0]) {
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erofs_err(sb, "empty device tag @ pos %llu", *pos);
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return -EINVAL;
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}
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dif->path = kmemdup_nul(dis->tag, sizeof(dis->tag), GFP_KERNEL);
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if (!dif->path)
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return -ENOMEM;
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}
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if (erofs_is_fscache_mode(sb)) {
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fscache = erofs_fscache_register_cookie(sb, dif->path, 0);
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if (IS_ERR(fscache))
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return PTR_ERR(fscache);
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dif->fscache = fscache;
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} else if (!sbi->devs->flatdev) {
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bdev = blkdev_get_by_path(dif->path, BLK_OPEN_READ, sb->s_type,
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NULL);
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if (IS_ERR(bdev))
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return PTR_ERR(bdev);
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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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NULL, NULL);
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}
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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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return 0;
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}
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static int erofs_scan_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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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 (sbi->devs->extra_devices &&
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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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if (!sbi->devs->extra_devices && !erofs_is_fscache_mode(sb))
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sbi->devs->flatdev = true;
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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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if (sbi->devs->extra_devices) {
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idr_for_each_entry(&sbi->devs->tree, dif, id) {
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err = erofs_init_device(&buf, sb, dif, &pos);
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if (err)
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break;
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}
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} else {
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for (id = 0; id < ondisk_extradevs; id++) {
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dif = kzalloc(sizeof(*dif), GFP_KERNEL);
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if (!dif) {
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err = -ENOMEM;
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break;
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}
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err = idr_alloc(&sbi->devs->tree, dif, 0, 0, GFP_KERNEL);
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if (err < 0) {
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kfree(dif);
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break;
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}
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++sbi->devs->extra_devices;
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err = erofs_init_device(&buf, sb, dif, &pos);
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if (err)
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break;
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}
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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 erofs_buf buf = __EROFS_BUF_INITIALIZER;
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struct erofs_super_block *dsb;
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void *data;
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int ret;
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data = erofs_read_metabuf(&buf, sb, 0, EROFS_KMAP);
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if (IS_ERR(data)) {
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erofs_err(sb, "cannot read erofs superblock");
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return PTR_ERR(data);
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}
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sbi = EROFS_SB(sb);
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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->blkszbits = dsb->blkszbits;
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if (sbi->blkszbits < 9 || sbi->blkszbits > PAGE_SHIFT) {
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erofs_err(sb, "blkszbits %u isn't supported", sbi->blkszbits);
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goto out;
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}
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if (dsb->dirblkbits) {
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erofs_err(sb, "dirblkbits %u isn't supported", dsb->dirblkbits);
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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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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 > PAGE_SIZE - EROFS_SUPER_OFFSET) {
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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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sbi->xattr_prefix_start = le32_to_cpu(dsb->xattr_prefix_start);
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sbi->xattr_prefix_count = dsb->xattr_prefix_count;
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sbi->xattr_filter_reserved = dsb->xattr_filter_reserved;
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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->packed_nid = le64_to_cpu(dsb->packed_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_scan_devices(sb, dsb);
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if (erofs_is_fscache_mode(sb))
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erofs_info(sb, "EXPERIMENTAL fscache-based on-demand read feature in use. Use at your own risk!");
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out:
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erofs_put_metabuf(&buf);
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return ret;
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}
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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_fsid,
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Opt_domain_id,
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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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|
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static const struct fs_parameter_spec erofs_fs_parameters[] = {
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|
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),
|
|
fsparam_string("fsid", Opt_fsid),
|
|
fsparam_string("domain_id", Opt_domain_id),
|
|
{}
|
|
};
|
|
|
|
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;
|
|
#ifdef CONFIG_EROFS_FS_ONDEMAND
|
|
case Opt_fsid:
|
|
kfree(ctx->fsid);
|
|
ctx->fsid = kstrdup(param->string, GFP_KERNEL);
|
|
if (!ctx->fsid)
|
|
return -ENOMEM;
|
|
break;
|
|
case Opt_domain_id:
|
|
kfree(ctx->domain_id);
|
|
ctx->domain_id = kstrdup(param->string, GFP_KERNEL);
|
|
if (!ctx->domain_id)
|
|
return -ENOMEM;
|
|
break;
|
|
#else
|
|
case Opt_fsid:
|
|
case Opt_domain_id:
|
|
errorfc(fc, "%s option not supported", erofs_fs_parameters[opt].name);
|
|
break;
|
|
#endif
|
|
default:
|
|
return -ENOPARAM;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static struct inode *erofs_nfs_get_inode(struct super_block *sb,
|
|
u64 ino, u32 generation)
|
|
{
|
|
return erofs_iget(sb, ino);
|
|
}
|
|
|
|
static struct dentry *erofs_fh_to_dentry(struct super_block *sb,
|
|
struct fid *fid, int fh_len, int fh_type)
|
|
{
|
|
return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
|
|
erofs_nfs_get_inode);
|
|
}
|
|
|
|
static struct dentry *erofs_fh_to_parent(struct super_block *sb,
|
|
struct fid *fid, int fh_len, int fh_type)
|
|
{
|
|
return generic_fh_to_parent(sb, fid, fh_len, fh_type,
|
|
erofs_nfs_get_inode);
|
|
}
|
|
|
|
static struct dentry *erofs_get_parent(struct dentry *child)
|
|
{
|
|
erofs_nid_t nid;
|
|
unsigned int d_type;
|
|
int err;
|
|
|
|
err = erofs_namei(d_inode(child), &dotdot_name, &nid, &d_type);
|
|
if (err)
|
|
return ERR_PTR(err);
|
|
return d_obtain_alias(erofs_iget(child->d_sb, nid));
|
|
}
|
|
|
|
static const struct export_operations erofs_export_ops = {
|
|
.fh_to_dentry = erofs_fh_to_dentry,
|
|
.fh_to_parent = erofs_fh_to_parent,
|
|
.get_parent = erofs_get_parent,
|
|
};
|
|
|
|
static int erofs_fc_fill_pseudo_super(struct super_block *sb, struct fs_context *fc)
|
|
{
|
|
static const struct tree_descr empty_descr = {""};
|
|
|
|
return simple_fill_super(sb, EROFS_SUPER_MAGIC, &empty_descr);
|
|
}
|
|
|
|
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;
|
|
sb->s_flags |= SB_RDONLY | SB_NOATIME;
|
|
sb->s_maxbytes = MAX_LFS_FILESIZE;
|
|
sb->s_op = &erofs_sops;
|
|
|
|
sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
|
|
if (!sbi)
|
|
return -ENOMEM;
|
|
|
|
sb->s_fs_info = sbi;
|
|
sbi->opt = ctx->opt;
|
|
sbi->devs = ctx->devs;
|
|
ctx->devs = NULL;
|
|
sbi->fsid = ctx->fsid;
|
|
ctx->fsid = NULL;
|
|
sbi->domain_id = ctx->domain_id;
|
|
ctx->domain_id = NULL;
|
|
|
|
sbi->blkszbits = PAGE_SHIFT;
|
|
if (erofs_is_fscache_mode(sb)) {
|
|
sb->s_blocksize = PAGE_SIZE;
|
|
sb->s_blocksize_bits = PAGE_SHIFT;
|
|
|
|
err = erofs_fscache_register_fs(sb);
|
|
if (err)
|
|
return err;
|
|
|
|
err = super_setup_bdi(sb);
|
|
if (err)
|
|
return err;
|
|
} else {
|
|
if (!sb_set_blocksize(sb, PAGE_SIZE)) {
|
|
errorfc(fc, "failed to set initial blksize");
|
|
return -EINVAL;
|
|
}
|
|
|
|
sbi->dax_dev = fs_dax_get_by_bdev(sb->s_bdev,
|
|
&sbi->dax_part_off,
|
|
NULL, NULL);
|
|
}
|
|
|
|
err = erofs_read_superblock(sb);
|
|
if (err)
|
|
return err;
|
|
|
|
if (sb->s_blocksize_bits != sbi->blkszbits) {
|
|
if (erofs_is_fscache_mode(sb)) {
|
|
errorfc(fc, "unsupported blksize for fscache mode");
|
|
return -EINVAL;
|
|
}
|
|
if (!sb_set_blocksize(sb, 1 << sbi->blkszbits)) {
|
|
errorfc(fc, "failed to set erofs blksize");
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
if (test_opt(&sbi->opt, DAX_ALWAYS)) {
|
|
if (!sbi->dax_dev) {
|
|
errorfc(fc, "DAX unsupported by block device. Turning off DAX.");
|
|
clear_opt(&sbi->opt, DAX_ALWAYS);
|
|
} else if (sbi->blkszbits != PAGE_SHIFT) {
|
|
errorfc(fc, "unsupported blocksize for DAX");
|
|
clear_opt(&sbi->opt, DAX_ALWAYS);
|
|
}
|
|
}
|
|
|
|
sb->s_time_gran = 1;
|
|
sb->s_xattr = erofs_xattr_handlers;
|
|
sb->s_export_op = &erofs_export_ops;
|
|
|
|
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
|
|
|
|
inode = erofs_iget(sb, ROOT_NID(sbi));
|
|
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);
|
|
if (erofs_sb_has_fragments(sbi) && sbi->packed_nid) {
|
|
sbi->packed_inode = erofs_iget(sb, sbi->packed_nid);
|
|
if (IS_ERR(sbi->packed_inode)) {
|
|
err = PTR_ERR(sbi->packed_inode);
|
|
sbi->packed_inode = NULL;
|
|
return err;
|
|
}
|
|
}
|
|
err = erofs_init_managed_cache(sb);
|
|
if (err)
|
|
return err;
|
|
|
|
err = erofs_xattr_prefixes_init(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_anon_get_tree(struct fs_context *fc)
|
|
{
|
|
return get_tree_nodev(fc, erofs_fc_fill_pseudo_super);
|
|
}
|
|
|
|
static int erofs_fc_get_tree(struct fs_context *fc)
|
|
{
|
|
struct erofs_fs_context *ctx = fc->fs_private;
|
|
|
|
if (IS_ENABLED(CONFIG_EROFS_FS_ONDEMAND) && ctx->fsid)
|
|
return get_tree_nodev(fc, erofs_fc_fill_super);
|
|
|
|
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 (ctx->fsid || ctx->domain_id)
|
|
erofs_info(sb, "ignoring reconfiguration for fsid|domain_id.");
|
|
|
|
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, NULL);
|
|
if (dif->bdev)
|
|
blkdev_put(dif->bdev, &erofs_fs_type);
|
|
erofs_fscache_unregister_cookie(dif->fscache);
|
|
dif->fscache = NULL;
|
|
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->fsid);
|
|
kfree(ctx->domain_id);
|
|
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 const struct fs_context_operations erofs_anon_context_ops = {
|
|
.get_tree = erofs_fc_anon_get_tree,
|
|
};
|
|
|
|
static int erofs_init_fs_context(struct fs_context *fc)
|
|
{
|
|
struct erofs_fs_context *ctx;
|
|
|
|
/* pseudo mount for anon inodes */
|
|
if (fc->sb_flags & SB_KERNMOUNT) {
|
|
fc->ops = &erofs_anon_context_ops;
|
|
return 0;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
static void erofs_kill_sb(struct super_block *sb)
|
|
{
|
|
struct erofs_sb_info *sbi;
|
|
|
|
/* pseudo mount for anon inodes */
|
|
if (sb->s_flags & SB_KERNMOUNT) {
|
|
kill_anon_super(sb);
|
|
return;
|
|
}
|
|
|
|
if (erofs_is_fscache_mode(sb))
|
|
kill_anon_super(sb);
|
|
else
|
|
kill_block_super(sb);
|
|
|
|
sbi = EROFS_SB(sb);
|
|
if (!sbi)
|
|
return;
|
|
|
|
erofs_free_dev_context(sbi->devs);
|
|
fs_put_dax(sbi->dax_dev, NULL);
|
|
erofs_fscache_unregister_fs(sb);
|
|
kfree(sbi->fsid);
|
|
kfree(sbi->domain_id);
|
|
kfree(sbi);
|
|
sb->s_fs_info = 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);
|
|
erofs_xattr_prefixes_cleanup(sb);
|
|
#ifdef CONFIG_EROFS_FS_ZIP
|
|
iput(sbi->managed_cache);
|
|
sbi->managed_cache = NULL;
|
|
#endif
|
|
iput(sbi->packed_inode);
|
|
sbi->packed_inode = NULL;
|
|
erofs_free_dev_context(sbi->devs);
|
|
sbi->devs = NULL;
|
|
erofs_fscache_unregister_fs(sb);
|
|
}
|
|
|
|
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 | FS_ALLOW_IDMAP,
|
|
};
|
|
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 | SLAB_MEM_SPREAD | SLAB_ACCOUNT,
|
|
erofs_inode_init_once);
|
|
if (!erofs_inode_cachep)
|
|
return -ENOMEM;
|
|
|
|
err = erofs_init_shrinker();
|
|
if (err)
|
|
goto shrinker_err;
|
|
|
|
err = z_erofs_lzma_init();
|
|
if (err)
|
|
goto lzma_err;
|
|
|
|
err = z_erofs_deflate_init();
|
|
if (err)
|
|
goto deflate_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_deflate_exit();
|
|
deflate_err:
|
|
z_erofs_lzma_exit();
|
|
lzma_err:
|
|
erofs_exit_shrinker();
|
|
shrinker_err:
|
|
kmem_cache_destroy(erofs_inode_cachep);
|
|
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_deflate_exit();
|
|
z_erofs_lzma_exit();
|
|
erofs_exit_shrinker();
|
|
kmem_cache_destroy(erofs_inode_cachep);
|
|
erofs_pcpubuf_exit();
|
|
}
|
|
|
|
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 = 0;
|
|
|
|
if (!erofs_is_fscache_mode(sb))
|
|
id = huge_encode_dev(sb->s_bdev->bd_dev);
|
|
|
|
buf->f_type = sb->s_magic;
|
|
buf->f_bsize = sb->s_blocksize;
|
|
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");
|
|
#ifdef CONFIG_EROFS_FS_ONDEMAND
|
|
if (sbi->fsid)
|
|
seq_printf(seq, ",fsid=%s", sbi->fsid);
|
|
if (sbi->domain_id)
|
|
seq_printf(seq, ",domain_id=%s", sbi->domain_id);
|
|
#endif
|
|
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");
|