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lib/ext2fs/valid_blk.c
69 строк
2 KB
Andreas Dilger
ext2fs: fix fast symlink blocks check
11 ноя 2025, 22:37
11 ноя 2025, 22:37
ae7370a
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/* * valid_blk.c --- does the inode have valid blocks? * * Copyright 1997 by Theodore Ts'o * * %Begin-Header% * This file may be redistributed under the terms of the GNU Library * General Public License, version 2. * %End-Header% */ #include "config.h" #include <stdio.h> #if HAVE_UNISTD_H #include <unistd.h> #endif #include <string.h> #include <time.h> #include "ext2_fs.h" #include "ext2fs.h" /* * This function returns 1 if the inode's block entries actually * contain block entries. */ int ext2fs_inode_has_valid_blocks2(ext2_filsys fs, struct ext2_inode *inode) { /* * Only directories, regular files, and some symbolic links * have valid block entries. */ if (!LINUX_S_ISDIR(inode->i_mode) && !LINUX_S_ISREG(inode->i_mode) && !LINUX_S_ISLNK(inode->i_mode)) return 0; /* * If the symbolic link is a "fast symlink", then the symlink * target is stored in the block entries. */ if (LINUX_S_ISLNK (inode->i_mode)) { if (ext2fs_file_acl_block(fs, inode) == 0) { /* With no EA block, we can rely on i_blocks */ if (inode->i_blocks == 0) return 0; return !ext2fs_is_fast_symlink(inode); } else { /* With an EA block, life gets more tricky */ if (inode->i_size >= EXT2_N_BLOCKS*4) return 1; /* definitely using i_block[] */ if (inode->i_size > 4 && inode->i_block[1] == 0) return 1; /* definitely using i_block[] */ return 0; /* Probably a fast symlink */ } } /* * If this inode has inline data, it shouldn't have valid block * entries. */ if (inode->i_flags & EXT4_INLINE_DATA_FL) return 0; return 1; } int ext2fs_inode_has_valid_blocks(struct ext2_inode *inode) { return ext2fs_inode_has_valid_blocks2(NULL, inode); }