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660 lines
16 KiB
660 lines
16 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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* Copyright (C) 2021-2022, Alibaba Cloud |
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*/ |
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#include <linux/security.h> |
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#include "xattr.h" |
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|
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struct xattr_iter { |
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struct super_block *sb; |
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struct erofs_buf buf; |
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void *kaddr; |
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|
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erofs_blk_t blkaddr; |
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unsigned int ofs; |
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}; |
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|
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static int init_inode_xattrs(struct inode *inode) |
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{ |
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struct erofs_inode *const vi = EROFS_I(inode); |
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struct xattr_iter it; |
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unsigned int i; |
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struct erofs_xattr_ibody_header *ih; |
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struct super_block *sb; |
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struct erofs_sb_info *sbi; |
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int ret = 0; |
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|
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/* the most case is that xattrs of this inode are initialized. */ |
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if (test_bit(EROFS_I_EA_INITED_BIT, &vi->flags)) { |
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/* |
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* paired with smp_mb() at the end of the function to ensure |
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* fields will only be observed after the bit is set. |
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*/ |
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smp_mb(); |
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return 0; |
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} |
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|
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if (wait_on_bit_lock(&vi->flags, EROFS_I_BL_XATTR_BIT, TASK_KILLABLE)) |
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return -ERESTARTSYS; |
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|
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/* someone has initialized xattrs for us? */ |
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if (test_bit(EROFS_I_EA_INITED_BIT, &vi->flags)) |
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goto out_unlock; |
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|
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/* |
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* bypass all xattr operations if ->xattr_isize is not greater than |
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* sizeof(struct erofs_xattr_ibody_header), in detail: |
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* 1) it is not enough to contain erofs_xattr_ibody_header then |
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* ->xattr_isize should be 0 (it means no xattr); |
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* 2) it is just to contain erofs_xattr_ibody_header, which is on-disk |
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* undefined right now (maybe use later with some new sb feature). |
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*/ |
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if (vi->xattr_isize == sizeof(struct erofs_xattr_ibody_header)) { |
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erofs_err(inode->i_sb, |
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"xattr_isize %d of nid %llu is not supported yet", |
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vi->xattr_isize, vi->nid); |
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ret = -EOPNOTSUPP; |
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goto out_unlock; |
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} else if (vi->xattr_isize < sizeof(struct erofs_xattr_ibody_header)) { |
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if (vi->xattr_isize) { |
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erofs_err(inode->i_sb, |
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"bogus xattr ibody @ nid %llu", vi->nid); |
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DBG_BUGON(1); |
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ret = -EFSCORRUPTED; |
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goto out_unlock; /* xattr ondisk layout error */ |
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} |
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ret = -ENOATTR; |
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goto out_unlock; |
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} |
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sb = inode->i_sb; |
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sbi = EROFS_SB(sb); |
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it.buf = __EROFS_BUF_INITIALIZER; |
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it.blkaddr = erofs_blknr(iloc(sbi, vi->nid) + vi->inode_isize); |
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it.ofs = erofs_blkoff(iloc(sbi, vi->nid) + vi->inode_isize); |
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|
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/* read in shared xattr array (non-atomic, see kmalloc below) */ |
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it.kaddr = erofs_read_metabuf(&it.buf, sb, it.blkaddr, EROFS_KMAP); |
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if (IS_ERR(it.kaddr)) { |
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ret = PTR_ERR(it.kaddr); |
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goto out_unlock; |
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} |
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ih = (struct erofs_xattr_ibody_header *)(it.kaddr + it.ofs); |
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vi->xattr_shared_count = ih->h_shared_count; |
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vi->xattr_shared_xattrs = kmalloc_array(vi->xattr_shared_count, |
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sizeof(uint), GFP_KERNEL); |
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if (!vi->xattr_shared_xattrs) { |
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erofs_put_metabuf(&it.buf); |
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ret = -ENOMEM; |
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goto out_unlock; |
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} |
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|
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/* let's skip ibody header */ |
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it.ofs += sizeof(struct erofs_xattr_ibody_header); |
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for (i = 0; i < vi->xattr_shared_count; ++i) { |
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if (it.ofs >= EROFS_BLKSIZ) { |
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/* cannot be unaligned */ |
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DBG_BUGON(it.ofs != EROFS_BLKSIZ); |
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|
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it.kaddr = erofs_read_metabuf(&it.buf, sb, ++it.blkaddr, |
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EROFS_KMAP); |
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if (IS_ERR(it.kaddr)) { |
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kfree(vi->xattr_shared_xattrs); |
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vi->xattr_shared_xattrs = NULL; |
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ret = PTR_ERR(it.kaddr); |
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goto out_unlock; |
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} |
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it.ofs = 0; |
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} |
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vi->xattr_shared_xattrs[i] = |
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le32_to_cpu(*(__le32 *)(it.kaddr + it.ofs)); |
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it.ofs += sizeof(__le32); |
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} |
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erofs_put_metabuf(&it.buf); |
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|
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/* paired with smp_mb() at the beginning of the function. */ |
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smp_mb(); |
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set_bit(EROFS_I_EA_INITED_BIT, &vi->flags); |
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|
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out_unlock: |
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clear_and_wake_up_bit(EROFS_I_BL_XATTR_BIT, &vi->flags); |
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return ret; |
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} |
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/* |
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* the general idea for these return values is |
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* if 0 is returned, go on processing the current xattr; |
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* 1 (> 0) is returned, skip this round to process the next xattr; |
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* -err (< 0) is returned, an error (maybe ENOXATTR) occurred |
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* and need to be handled |
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*/ |
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struct xattr_iter_handlers { |
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int (*entry)(struct xattr_iter *_it, struct erofs_xattr_entry *entry); |
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int (*name)(struct xattr_iter *_it, unsigned int processed, char *buf, |
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unsigned int len); |
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int (*alloc_buffer)(struct xattr_iter *_it, unsigned int value_sz); |
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void (*value)(struct xattr_iter *_it, unsigned int processed, char *buf, |
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unsigned int len); |
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}; |
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static inline int xattr_iter_fixup(struct xattr_iter *it) |
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{ |
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if (it->ofs < EROFS_BLKSIZ) |
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return 0; |
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|
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it->blkaddr += erofs_blknr(it->ofs); |
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it->kaddr = erofs_read_metabuf(&it->buf, it->sb, it->blkaddr, |
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EROFS_KMAP_ATOMIC); |
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if (IS_ERR(it->kaddr)) |
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return PTR_ERR(it->kaddr); |
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it->ofs = erofs_blkoff(it->ofs); |
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return 0; |
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} |
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static int inline_xattr_iter_begin(struct xattr_iter *it, |
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struct inode *inode) |
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{ |
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struct erofs_inode *const vi = EROFS_I(inode); |
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struct erofs_sb_info *const sbi = EROFS_SB(inode->i_sb); |
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unsigned int xattr_header_sz, inline_xattr_ofs; |
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xattr_header_sz = inlinexattr_header_size(inode); |
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if (xattr_header_sz >= vi->xattr_isize) { |
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DBG_BUGON(xattr_header_sz > vi->xattr_isize); |
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return -ENOATTR; |
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} |
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inline_xattr_ofs = vi->inode_isize + xattr_header_sz; |
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it->blkaddr = erofs_blknr(iloc(sbi, vi->nid) + inline_xattr_ofs); |
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it->ofs = erofs_blkoff(iloc(sbi, vi->nid) + inline_xattr_ofs); |
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it->kaddr = erofs_read_metabuf(&it->buf, inode->i_sb, it->blkaddr, |
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EROFS_KMAP_ATOMIC); |
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if (IS_ERR(it->kaddr)) |
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return PTR_ERR(it->kaddr); |
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return vi->xattr_isize - xattr_header_sz; |
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} |
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/* |
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* Regardless of success or failure, `xattr_foreach' will end up with |
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* `ofs' pointing to the next xattr item rather than an arbitrary position. |
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*/ |
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static int xattr_foreach(struct xattr_iter *it, |
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const struct xattr_iter_handlers *op, |
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unsigned int *tlimit) |
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{ |
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struct erofs_xattr_entry entry; |
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unsigned int value_sz, processed, slice; |
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int err; |
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/* 0. fixup blkaddr, ofs, ipage */ |
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err = xattr_iter_fixup(it); |
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if (err) |
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return err; |
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/* |
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* 1. read xattr entry to the memory, |
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* since we do EROFS_XATTR_ALIGN |
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* therefore entry should be in the page |
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*/ |
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entry = *(struct erofs_xattr_entry *)(it->kaddr + it->ofs); |
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if (tlimit) { |
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unsigned int entry_sz = erofs_xattr_entry_size(&entry); |
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/* xattr on-disk corruption: xattr entry beyond xattr_isize */ |
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if (*tlimit < entry_sz) { |
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DBG_BUGON(1); |
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return -EFSCORRUPTED; |
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} |
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*tlimit -= entry_sz; |
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} |
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it->ofs += sizeof(struct erofs_xattr_entry); |
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value_sz = le16_to_cpu(entry.e_value_size); |
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/* handle entry */ |
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err = op->entry(it, &entry); |
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if (err) { |
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it->ofs += entry.e_name_len + value_sz; |
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goto out; |
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} |
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/* 2. handle xattr name (ofs will finally be at the end of name) */ |
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processed = 0; |
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while (processed < entry.e_name_len) { |
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if (it->ofs >= EROFS_BLKSIZ) { |
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DBG_BUGON(it->ofs > EROFS_BLKSIZ); |
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err = xattr_iter_fixup(it); |
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if (err) |
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goto out; |
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it->ofs = 0; |
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} |
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slice = min_t(unsigned int, EROFS_BLKSIZ - it->ofs, |
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entry.e_name_len - processed); |
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/* handle name */ |
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err = op->name(it, processed, it->kaddr + it->ofs, slice); |
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if (err) { |
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it->ofs += entry.e_name_len - processed + value_sz; |
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goto out; |
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} |
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it->ofs += slice; |
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processed += slice; |
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} |
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/* 3. handle xattr value */ |
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processed = 0; |
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if (op->alloc_buffer) { |
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err = op->alloc_buffer(it, value_sz); |
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if (err) { |
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it->ofs += value_sz; |
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goto out; |
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} |
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} |
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while (processed < value_sz) { |
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if (it->ofs >= EROFS_BLKSIZ) { |
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DBG_BUGON(it->ofs > EROFS_BLKSIZ); |
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err = xattr_iter_fixup(it); |
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if (err) |
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goto out; |
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it->ofs = 0; |
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} |
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slice = min_t(unsigned int, EROFS_BLKSIZ - it->ofs, |
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value_sz - processed); |
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op->value(it, processed, it->kaddr + it->ofs, slice); |
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it->ofs += slice; |
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processed += slice; |
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} |
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out: |
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/* xattrs should be 4-byte aligned (on-disk constraint) */ |
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it->ofs = EROFS_XATTR_ALIGN(it->ofs); |
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return err < 0 ? err : 0; |
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} |
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struct getxattr_iter { |
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struct xattr_iter it; |
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char *buffer; |
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int buffer_size, index; |
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struct qstr name; |
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}; |
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static int xattr_entrymatch(struct xattr_iter *_it, |
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struct erofs_xattr_entry *entry) |
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{ |
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struct getxattr_iter *it = container_of(_it, struct getxattr_iter, it); |
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return (it->index != entry->e_name_index || |
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it->name.len != entry->e_name_len) ? -ENOATTR : 0; |
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} |
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static int xattr_namematch(struct xattr_iter *_it, |
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unsigned int processed, char *buf, unsigned int len) |
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{ |
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struct getxattr_iter *it = container_of(_it, struct getxattr_iter, it); |
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return memcmp(buf, it->name.name + processed, len) ? -ENOATTR : 0; |
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} |
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static int xattr_checkbuffer(struct xattr_iter *_it, |
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unsigned int value_sz) |
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{ |
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struct getxattr_iter *it = container_of(_it, struct getxattr_iter, it); |
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int err = it->buffer_size < value_sz ? -ERANGE : 0; |
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it->buffer_size = value_sz; |
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return !it->buffer ? 1 : err; |
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} |
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static void xattr_copyvalue(struct xattr_iter *_it, |
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unsigned int processed, |
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char *buf, unsigned int len) |
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{ |
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struct getxattr_iter *it = container_of(_it, struct getxattr_iter, it); |
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memcpy(it->buffer + processed, buf, len); |
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} |
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static const struct xattr_iter_handlers find_xattr_handlers = { |
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.entry = xattr_entrymatch, |
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.name = xattr_namematch, |
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.alloc_buffer = xattr_checkbuffer, |
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.value = xattr_copyvalue |
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}; |
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static int inline_getxattr(struct inode *inode, struct getxattr_iter *it) |
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{ |
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int ret; |
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unsigned int remaining; |
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ret = inline_xattr_iter_begin(&it->it, inode); |
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if (ret < 0) |
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return ret; |
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remaining = ret; |
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while (remaining) { |
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ret = xattr_foreach(&it->it, &find_xattr_handlers, &remaining); |
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if (ret != -ENOATTR) |
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break; |
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} |
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return ret ? ret : it->buffer_size; |
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} |
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static int shared_getxattr(struct inode *inode, struct getxattr_iter *it) |
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{ |
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struct erofs_inode *const vi = EROFS_I(inode); |
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struct super_block *const sb = inode->i_sb; |
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struct erofs_sb_info *const sbi = EROFS_SB(sb); |
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unsigned int i; |
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int ret = -ENOATTR; |
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for (i = 0; i < vi->xattr_shared_count; ++i) { |
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erofs_blk_t blkaddr = |
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xattrblock_addr(sbi, vi->xattr_shared_xattrs[i]); |
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it->it.ofs = xattrblock_offset(sbi, vi->xattr_shared_xattrs[i]); |
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it->it.kaddr = erofs_read_metabuf(&it->it.buf, sb, blkaddr, |
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EROFS_KMAP_ATOMIC); |
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if (IS_ERR(it->it.kaddr)) |
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return PTR_ERR(it->it.kaddr); |
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it->it.blkaddr = blkaddr; |
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ret = xattr_foreach(&it->it, &find_xattr_handlers, NULL); |
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if (ret != -ENOATTR) |
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break; |
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} |
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return ret ? ret : it->buffer_size; |
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} |
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static bool erofs_xattr_user_list(struct dentry *dentry) |
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{ |
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return test_opt(&EROFS_SB(dentry->d_sb)->opt, XATTR_USER); |
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} |
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static bool erofs_xattr_trusted_list(struct dentry *dentry) |
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{ |
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return capable(CAP_SYS_ADMIN); |
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} |
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int erofs_getxattr(struct inode *inode, int index, |
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const char *name, |
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void *buffer, size_t buffer_size) |
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{ |
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int ret; |
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struct getxattr_iter it; |
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if (!name) |
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return -EINVAL; |
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ret = init_inode_xattrs(inode); |
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if (ret) |
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return ret; |
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it.index = index; |
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it.name.len = strlen(name); |
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if (it.name.len > EROFS_NAME_LEN) |
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return -ERANGE; |
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it.it.buf = __EROFS_BUF_INITIALIZER; |
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it.name.name = name; |
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it.buffer = buffer; |
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it.buffer_size = buffer_size; |
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it.it.sb = inode->i_sb; |
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ret = inline_getxattr(inode, &it); |
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if (ret == -ENOATTR) |
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ret = shared_getxattr(inode, &it); |
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erofs_put_metabuf(&it.it.buf); |
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return ret; |
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} |
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static int erofs_xattr_generic_get(const struct xattr_handler *handler, |
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struct dentry *unused, struct inode *inode, |
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const char *name, void *buffer, size_t size) |
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{ |
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struct erofs_sb_info *const sbi = EROFS_I_SB(inode); |
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|
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switch (handler->flags) { |
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case EROFS_XATTR_INDEX_USER: |
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if (!test_opt(&sbi->opt, XATTR_USER)) |
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return -EOPNOTSUPP; |
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break; |
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case EROFS_XATTR_INDEX_TRUSTED: |
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break; |
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case EROFS_XATTR_INDEX_SECURITY: |
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break; |
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default: |
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return -EINVAL; |
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} |
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return erofs_getxattr(inode, handler->flags, name, buffer, size); |
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} |
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const struct xattr_handler erofs_xattr_user_handler = { |
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.prefix = XATTR_USER_PREFIX, |
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.flags = EROFS_XATTR_INDEX_USER, |
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.list = erofs_xattr_user_list, |
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.get = erofs_xattr_generic_get, |
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}; |
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const struct xattr_handler erofs_xattr_trusted_handler = { |
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.prefix = XATTR_TRUSTED_PREFIX, |
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.flags = EROFS_XATTR_INDEX_TRUSTED, |
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.list = erofs_xattr_trusted_list, |
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.get = erofs_xattr_generic_get, |
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}; |
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|
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#ifdef CONFIG_EROFS_FS_SECURITY |
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const struct xattr_handler __maybe_unused erofs_xattr_security_handler = { |
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.prefix = XATTR_SECURITY_PREFIX, |
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.flags = EROFS_XATTR_INDEX_SECURITY, |
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.get = erofs_xattr_generic_get, |
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}; |
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#endif |
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|
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const struct xattr_handler *erofs_xattr_handlers[] = { |
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&erofs_xattr_user_handler, |
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#ifdef CONFIG_EROFS_FS_POSIX_ACL |
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&posix_acl_access_xattr_handler, |
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&posix_acl_default_xattr_handler, |
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#endif |
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&erofs_xattr_trusted_handler, |
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#ifdef CONFIG_EROFS_FS_SECURITY |
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&erofs_xattr_security_handler, |
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#endif |
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NULL, |
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}; |
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|
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struct listxattr_iter { |
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struct xattr_iter it; |
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|
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struct dentry *dentry; |
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char *buffer; |
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int buffer_size, buffer_ofs; |
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}; |
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|
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static int xattr_entrylist(struct xattr_iter *_it, |
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struct erofs_xattr_entry *entry) |
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{ |
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struct listxattr_iter *it = |
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container_of(_it, struct listxattr_iter, it); |
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unsigned int prefix_len; |
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const char *prefix; |
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|
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const struct xattr_handler *h = |
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erofs_xattr_handler(entry->e_name_index); |
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|
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if (!h || (h->list && !h->list(it->dentry))) |
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return 1; |
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|
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prefix = xattr_prefix(h); |
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prefix_len = strlen(prefix); |
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|
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if (!it->buffer) { |
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it->buffer_ofs += prefix_len + entry->e_name_len + 1; |
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return 1; |
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} |
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|
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if (it->buffer_ofs + prefix_len |
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+ entry->e_name_len + 1 > it->buffer_size) |
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return -ERANGE; |
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|
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memcpy(it->buffer + it->buffer_ofs, prefix, prefix_len); |
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it->buffer_ofs += prefix_len; |
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return 0; |
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} |
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|
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static int xattr_namelist(struct xattr_iter *_it, |
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unsigned int processed, char *buf, unsigned int len) |
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{ |
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struct listxattr_iter *it = |
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container_of(_it, struct listxattr_iter, it); |
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|
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memcpy(it->buffer + it->buffer_ofs, buf, len); |
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it->buffer_ofs += len; |
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return 0; |
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} |
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|
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static int xattr_skipvalue(struct xattr_iter *_it, |
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unsigned int value_sz) |
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{ |
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struct listxattr_iter *it = |
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container_of(_it, struct listxattr_iter, it); |
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|
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it->buffer[it->buffer_ofs++] = '\0'; |
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return 1; |
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} |
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|
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static const struct xattr_iter_handlers list_xattr_handlers = { |
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.entry = xattr_entrylist, |
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.name = xattr_namelist, |
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.alloc_buffer = xattr_skipvalue, |
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.value = NULL |
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}; |
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|
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static int inline_listxattr(struct listxattr_iter *it) |
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{ |
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int ret; |
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unsigned int remaining; |
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|
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ret = inline_xattr_iter_begin(&it->it, d_inode(it->dentry)); |
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if (ret < 0) |
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return ret; |
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|
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remaining = ret; |
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while (remaining) { |
|
ret = xattr_foreach(&it->it, &list_xattr_handlers, &remaining); |
|
if (ret) |
|
break; |
|
} |
|
return ret ? ret : it->buffer_ofs; |
|
} |
|
|
|
static int shared_listxattr(struct listxattr_iter *it) |
|
{ |
|
struct inode *const inode = d_inode(it->dentry); |
|
struct erofs_inode *const vi = EROFS_I(inode); |
|
struct super_block *const sb = inode->i_sb; |
|
struct erofs_sb_info *const sbi = EROFS_SB(sb); |
|
unsigned int i; |
|
int ret = 0; |
|
|
|
for (i = 0; i < vi->xattr_shared_count; ++i) { |
|
erofs_blk_t blkaddr = |
|
xattrblock_addr(sbi, vi->xattr_shared_xattrs[i]); |
|
|
|
it->it.ofs = xattrblock_offset(sbi, vi->xattr_shared_xattrs[i]); |
|
it->it.kaddr = erofs_read_metabuf(&it->it.buf, sb, blkaddr, |
|
EROFS_KMAP_ATOMIC); |
|
if (IS_ERR(it->it.kaddr)) |
|
return PTR_ERR(it->it.kaddr); |
|
it->it.blkaddr = blkaddr; |
|
|
|
ret = xattr_foreach(&it->it, &list_xattr_handlers, NULL); |
|
if (ret) |
|
break; |
|
} |
|
return ret ? ret : it->buffer_ofs; |
|
} |
|
|
|
ssize_t erofs_listxattr(struct dentry *dentry, |
|
char *buffer, size_t buffer_size) |
|
{ |
|
int ret; |
|
struct listxattr_iter it; |
|
|
|
ret = init_inode_xattrs(d_inode(dentry)); |
|
if (ret == -ENOATTR) |
|
return 0; |
|
if (ret) |
|
return ret; |
|
|
|
it.it.buf = __EROFS_BUF_INITIALIZER; |
|
it.dentry = dentry; |
|
it.buffer = buffer; |
|
it.buffer_size = buffer_size; |
|
it.buffer_ofs = 0; |
|
|
|
it.it.sb = dentry->d_sb; |
|
|
|
ret = inline_listxattr(&it); |
|
if (ret >= 0 || ret == -ENOATTR) |
|
ret = shared_listxattr(&it); |
|
erofs_put_metabuf(&it.it.buf); |
|
return ret; |
|
} |
|
|
|
#ifdef CONFIG_EROFS_FS_POSIX_ACL |
|
struct posix_acl *erofs_get_acl(struct inode *inode, int type, bool rcu) |
|
{ |
|
struct posix_acl *acl; |
|
int prefix, rc; |
|
char *value = NULL; |
|
|
|
if (rcu) |
|
return ERR_PTR(-ECHILD); |
|
|
|
switch (type) { |
|
case ACL_TYPE_ACCESS: |
|
prefix = EROFS_XATTR_INDEX_POSIX_ACL_ACCESS; |
|
break; |
|
case ACL_TYPE_DEFAULT: |
|
prefix = EROFS_XATTR_INDEX_POSIX_ACL_DEFAULT; |
|
break; |
|
default: |
|
return ERR_PTR(-EINVAL); |
|
} |
|
|
|
rc = erofs_getxattr(inode, prefix, "", NULL, 0); |
|
if (rc > 0) { |
|
value = kmalloc(rc, GFP_KERNEL); |
|
if (!value) |
|
return ERR_PTR(-ENOMEM); |
|
rc = erofs_getxattr(inode, prefix, "", value, rc); |
|
} |
|
|
|
if (rc == -ENOATTR) |
|
acl = NULL; |
|
else if (rc < 0) |
|
acl = ERR_PTR(rc); |
|
else |
|
acl = posix_acl_from_xattr(&init_user_ns, value, rc); |
|
kfree(value); |
|
return acl; |
|
} |
|
#endif
|
|
|