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753 lines
17 KiB
753 lines
17 KiB
// 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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*/ |
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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 "xattr.h" |
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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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 page **pagep, |
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erofs_off_t *offset, int *lengthp) |
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{ |
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struct page *page = *pagep; |
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u8 *buffer, *ptr; |
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int len, i, cnt; |
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erofs_blk_t blk; |
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|
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*offset = round_up(*offset, 4); |
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blk = erofs_blknr(*offset); |
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|
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if (!page || page->index != blk) { |
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if (page) { |
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unlock_page(page); |
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put_page(page); |
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} |
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page = erofs_get_meta_page(sb, blk); |
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if (IS_ERR(page)) |
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goto err_nullpage; |
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} |
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ptr = kmap(page); |
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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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buffer = ERR_PTR(-ENOMEM); |
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goto out; |
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} |
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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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blk = erofs_blknr(*offset); |
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if (!page || page->index != blk) { |
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if (page) { |
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kunmap(page); |
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unlock_page(page); |
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put_page(page); |
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} |
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page = erofs_get_meta_page(sb, blk); |
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if (IS_ERR(page)) { |
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kfree(buffer); |
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goto err_nullpage; |
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} |
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ptr = kmap(page); |
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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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out: |
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kunmap(page); |
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*pagep = page; |
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return buffer; |
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err_nullpage: |
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*pagep = NULL; |
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return page; |
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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; |
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struct page *page; |
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unsigned int algs, alg; |
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erofs_off_t offset; |
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int size, ret; |
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sbi = EROFS_SB(sb); |
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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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page = NULL; |
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alg = 0; |
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ret = 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, &page, &offset, &size); |
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if (IS_ERR(data)) { |
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ret = PTR_ERR(data); |
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goto err; |
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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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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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goto err; |
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} |
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err: |
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if (page) { |
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unlock_page(page); |
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put_page(page); |
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} |
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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_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->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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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->cache_strategy = EROFS_ZIP_CACHE_READAROUND; |
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ctx->max_sync_decompress_pages = 3; |
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ctx->readahead_sync_decompress = false; |
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#endif |
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#ifdef CONFIG_EROFS_FS_XATTR |
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set_opt(ctx, XATTR_USER); |
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#endif |
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#ifdef CONFIG_EROFS_FS_POSIX_ACL |
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set_opt(ctx, 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_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 fs_parameter_spec erofs_fs_parameters[] = { |
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fsparam_flag_no("user_xattr", Opt_user_xattr), |
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fsparam_flag_no("acl", Opt_acl), |
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fsparam_enum("cache_strategy", Opt_cache_strategy, |
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erofs_param_cache_strategy), |
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{} |
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}; |
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static int erofs_fc_parse_param(struct fs_context *fc, |
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struct fs_parameter *param) |
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{ |
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struct erofs_fs_context *ctx __maybe_unused = fc->fs_private; |
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struct fs_parse_result result; |
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int opt; |
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opt = fs_parse(fc, erofs_fs_parameters, param, &result); |
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if (opt < 0) |
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return opt; |
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switch (opt) { |
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case Opt_user_xattr: |
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#ifdef CONFIG_EROFS_FS_XATTR |
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if (result.boolean) |
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set_opt(ctx, XATTR_USER); |
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else |
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clear_opt(ctx, XATTR_USER); |
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#else |
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errorfc(fc, "{,no}user_xattr options not supported"); |
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#endif |
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break; |
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case Opt_acl: |
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#ifdef CONFIG_EROFS_FS_POSIX_ACL |
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if (result.boolean) |
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set_opt(ctx, POSIX_ACL); |
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else |
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clear_opt(ctx, POSIX_ACL); |
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#else |
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errorfc(fc, "{,no}acl options not supported"); |
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#endif |
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break; |
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case Opt_cache_strategy: |
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#ifdef CONFIG_EROFS_FS_ZIP |
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ctx->cache_strategy = result.uint_32; |
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#else |
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errorfc(fc, "compression not supported, cache_strategy ignored"); |
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#endif |
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break; |
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default: |
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return -ENOPARAM; |
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} |
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return 0; |
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} |
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#ifdef CONFIG_EROFS_FS_ZIP |
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static const struct address_space_operations managed_cache_aops; |
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static int erofs_managed_cache_releasepage(struct page *page, gfp_t gfp_mask) |
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{ |
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int ret = 1; /* 0 - busy */ |
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struct address_space *const mapping = page->mapping; |
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DBG_BUGON(!PageLocked(page)); |
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DBG_BUGON(mapping->a_ops != &managed_cache_aops); |
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if (PagePrivate(page)) |
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ret = erofs_try_to_free_cached_page(mapping, page); |
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return ret; |
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} |
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static void erofs_managed_cache_invalidatepage(struct page *page, |
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unsigned int offset, |
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unsigned int length) |
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{ |
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const unsigned int stop = length + offset; |
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DBG_BUGON(!PageLocked(page)); |
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/* Check for potential overflow in debug mode */ |
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DBG_BUGON(stop > PAGE_SIZE || stop < length); |
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if (offset == 0 && stop == PAGE_SIZE) |
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while (!erofs_managed_cache_releasepage(page, GFP_NOFS)) |
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cond_resched(); |
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} |
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static const struct address_space_operations managed_cache_aops = { |
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.releasepage = erofs_managed_cache_releasepage, |
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.invalidatepage = erofs_managed_cache_invalidatepage, |
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}; |
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static int erofs_init_managed_cache(struct super_block *sb) |
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{ |
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struct erofs_sb_info *const sbi = EROFS_SB(sb); |
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struct inode *const inode = new_inode(sb); |
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|
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if (!inode) |
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return -ENOMEM; |
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set_nlink(inode, 1); |
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inode->i_size = OFFSET_MAX; |
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inode->i_mapping->a_ops = &managed_cache_aops; |
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mapping_set_gfp_mask(inode->i_mapping, |
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GFP_NOFS | __GFP_HIGHMEM | __GFP_MOVABLE); |
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sbi->managed_cache = inode; |
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return 0; |
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} |
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#else |
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static int erofs_init_managed_cache(struct super_block *sb) { return 0; } |
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#endif |
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static int erofs_fc_fill_super(struct super_block *sb, struct fs_context *fc) |
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{ |
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struct inode *inode; |
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struct erofs_sb_info *sbi; |
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struct erofs_fs_context *ctx = fc->fs_private; |
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int err; |
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sb->s_magic = EROFS_SUPER_MAGIC; |
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if (!sb_set_blocksize(sb, EROFS_BLKSIZ)) { |
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erofs_err(sb, "failed to set erofs blksize"); |
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return -EINVAL; |
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} |
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sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); |
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if (!sbi) |
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return -ENOMEM; |
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|
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sb->s_fs_info = sbi; |
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err = erofs_read_superblock(sb); |
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if (err) |
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return err; |
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sb->s_flags |= SB_RDONLY | SB_NOATIME; |
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sb->s_maxbytes = MAX_LFS_FILESIZE; |
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sb->s_time_gran = 1; |
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|
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sb->s_op = &erofs_sops; |
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sb->s_xattr = erofs_xattr_handlers; |
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|
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if (test_opt(ctx, POSIX_ACL)) |
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sb->s_flags |= SB_POSIXACL; |
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else |
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sb->s_flags &= ~SB_POSIXACL; |
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|
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sbi->ctx = *ctx; |
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|
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#ifdef CONFIG_EROFS_FS_ZIP |
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xa_init(&sbi->managed_pslots); |
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#endif |
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|
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/* get the root inode */ |
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inode = erofs_iget(sb, ROOT_NID(sbi), true); |
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if (IS_ERR(inode)) |
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return PTR_ERR(inode); |
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|
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if (!S_ISDIR(inode->i_mode)) { |
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erofs_err(sb, "rootino(nid %llu) is not a directory(i_mode %o)", |
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ROOT_NID(sbi), inode->i_mode); |
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iput(inode); |
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return -EINVAL; |
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} |
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|
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sb->s_root = d_make_root(inode); |
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if (!sb->s_root) |
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return -ENOMEM; |
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|
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erofs_shrinker_register(sb); |
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/* sb->s_umount is already locked, SB_ACTIVE and SB_BORN are not set */ |
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err = erofs_init_managed_cache(sb); |
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if (err) |
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return err; |
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|
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erofs_info(sb, "mounted with root inode @ nid %llu.", ROOT_NID(sbi)); |
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return 0; |
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} |
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|
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static int erofs_fc_get_tree(struct fs_context *fc) |
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{ |
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return get_tree_bdev(fc, erofs_fc_fill_super); |
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} |
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|
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static int erofs_fc_reconfigure(struct fs_context *fc) |
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{ |
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struct super_block *sb = fc->root->d_sb; |
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struct erofs_sb_info *sbi = EROFS_SB(sb); |
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struct erofs_fs_context *ctx = fc->fs_private; |
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|
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DBG_BUGON(!sb_rdonly(sb)); |
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|
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if (test_opt(ctx, POSIX_ACL)) |
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fc->sb_flags |= SB_POSIXACL; |
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else |
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fc->sb_flags &= ~SB_POSIXACL; |
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|
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sbi->ctx = *ctx; |
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|
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fc->sb_flags |= SB_RDONLY; |
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return 0; |
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} |
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|
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static void erofs_fc_free(struct fs_context *fc) |
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{ |
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kfree(fc->fs_private); |
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} |
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|
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static const struct fs_context_operations erofs_context_ops = { |
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.parse_param = erofs_fc_parse_param, |
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.get_tree = erofs_fc_get_tree, |
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.reconfigure = erofs_fc_reconfigure, |
|
.free = erofs_fc_free, |
|
}; |
|
|
|
static int erofs_init_fs_context(struct fs_context *fc) |
|
{ |
|
fc->fs_private = kzalloc(sizeof(struct erofs_fs_context), GFP_KERNEL); |
|
if (!fc->fs_private) |
|
return -ENOMEM; |
|
|
|
/* set default mount options */ |
|
erofs_default_options(fc->fs_private); |
|
|
|
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; |
|
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_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; |
|
|
|
erofs_pcpubuf_init(); |
|
err = z_erofs_init_zip_subsystem(); |
|
if (err) |
|
goto zip_err; |
|
|
|
err = register_filesystem(&erofs_fs_type); |
|
if (err) |
|
goto fs_err; |
|
|
|
return 0; |
|
|
|
fs_err: |
|
z_erofs_exit_zip_subsystem(); |
|
zip_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); |
|
z_erofs_exit_zip_subsystem(); |
|
erofs_exit_shrinker(); |
|
|
|
/* Ensure all RCU free inodes are safe before cache is destroyed. */ |
|
rcu_barrier(); |
|
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->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 __maybe_unused = EROFS_SB(root->d_sb); |
|
struct erofs_fs_context *ctx __maybe_unused = &sbi->ctx; |
|
|
|
#ifdef CONFIG_EROFS_FS_XATTR |
|
if (test_opt(ctx, XATTR_USER)) |
|
seq_puts(seq, ",user_xattr"); |
|
else |
|
seq_puts(seq, ",nouser_xattr"); |
|
#endif |
|
#ifdef CONFIG_EROFS_FS_POSIX_ACL |
|
if (test_opt(ctx, POSIX_ACL)) |
|
seq_puts(seq, ",acl"); |
|
else |
|
seq_puts(seq, ",noacl"); |
|
#endif |
|
#ifdef CONFIG_EROFS_FS_ZIP |
|
if (ctx->cache_strategy == EROFS_ZIP_CACHE_DISABLED) |
|
seq_puts(seq, ",cache_strategy=disabled"); |
|
else if (ctx->cache_strategy == EROFS_ZIP_CACHE_READAHEAD) |
|
seq_puts(seq, ",cache_strategy=readahead"); |
|
else if (ctx->cache_strategy == EROFS_ZIP_CACHE_READAROUND) |
|
seq_puts(seq, ",cache_strategy=readaround"); |
|
#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");
|
|
|