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https://github.com/linux-apfs/apfsprogs.git
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Ernesto A. Fernández
b4f0aef525
Introduce compression, using a modified version of Stan's code from the driver, plus my new implementation of LZBITMAP. This is mainly needed for sealed volumes, since for some reason Apple calculates hashes on the decompressed contents of files instead of the xattrs themselves. At this point, the hash checks are all passing. Very few checks on the compression metadata were put in place; I would like to revisit this in the future, at least to check the inode's reported decompressed size, but it's not a priority right now. These are a lot of messy changes and I was forced to interrupt the work halfway through to reverse engineer LZBITMAP, so I don't recall all the details and I'll keep the commit message brief. Signed-off-by: Ernesto A. Fernández <ernesto@corellium.com>
90 lines
3.2 KiB
C
90 lines
3.2 KiB
C
/*
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* Copyright (C) 2019 Ernesto A. Fernández <ernesto.mnd.fernandez@gmail.com>
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*/
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#ifndef _INODE_H
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#define _INODE_H
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#include <sys/stat.h> /* The macros for the inode mode */
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#include <apfs/types.h>
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#include "htable.h"
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struct apfs_inode_key;
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struct apfs_sibling_link_key;
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struct apfs_sibling_map_key;
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/* Flags for the bitmap of seen system xattrs (i_xattr_bmap) */
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#define XATTR_BMAP_SYMLINK 0x01 /* Symlink target xattr */
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#define XATTR_BMAP_RSRC_FORK 0x02 /* Resource fork xattr */
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#define XATTR_BMAP_SECURITY 0x04 /* Security xattr */
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#define XATTR_BMAP_FINDER_INFO 0x08 /* Finder info xattr */
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#define XATTR_BMAP_COMPRESSED 0x10 /* Compression header xattr */
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/*
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* Inode data in memory
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*/
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struct inode {
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struct htable_entry i_htable; /* Hash table entry header */
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u64 i_private_id; /* Id of the inode's data stream */
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bool i_seen; /* Has this inode been seen? */
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/* Inode information read from its record (or from its dentries) */
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u16 i_mode; /* File mode */
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union {
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u32 i_nchildren; /* Number of children of directory */
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u32 i_nlink; /* Number of hard links to file */
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};
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u64 i_sparse_bytes; /* Number of sparse bytes */
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u64 i_flags; /* Internal flags */
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u32 i_rdev; /* Device ID */
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char *i_name; /* Name of primary link */
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u64 i_parent_id; /* Parent id for the primary link */
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struct dstream *i_dstream; /* The inode's dstream (can be NULL) */
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u64 i_purg_flags; /* Inode purgeable flags */
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char *i_purg_name; /* Purgeable dentry name (can be NULL) */
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u32 i_owner; /* Id of the owner user */
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struct dirstat *i_dirstat; /* Directory statistics (can be NULL) */
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struct compress *i_compress; /* Compression data (can be NULL) */
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/* Inode stats measured by the fsck */
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u8 i_xattr_bmap; /* Bitmap of system xattrs for inode */
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u16 i_xfield_bmap; /* Bitmap of xfields for inode */
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u32 i_child_count; /* Number of children of directory */
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u32 i_link_count; /* Number of dentries for file */
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char *i_first_name; /* Name of first dentry encountered */
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u64 i_first_parent; /* Parent id of the first dentry seen */
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struct sibling *i_siblings; /* Linked list of siblings for inode */
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};
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#define i_ino i_htable.h_id /* Inode number */
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/*
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* Sibling link data in memory
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*/
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struct sibling {
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struct sibling *s_next; /* Next sibling in linked list */
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u64 s_id; /* Sibling id */
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bool s_checked; /* Has this sibling been checked? */
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bool s_mapped; /* Has the sibling map been seen? */
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u64 s_parent_ino; /* Inode number for parent */
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u16 s_name_len; /* Name length */
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u8 *s_name; /* In-memory copy of the name */
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};
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extern void free_inode_table(struct htable_entry **table);
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extern struct inode *get_inode(u64 ino);
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extern void check_inode_ids(u64 ino, u64 parent_ino);
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extern void parse_inode_record(struct apfs_inode_key *key,
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struct apfs_inode_val *val, int len);
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extern struct sibling *get_sibling(u64 id, struct inode *inode);
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extern void set_or_check_sibling(u64 parent_id, int namelen, u8 *name,
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struct sibling *sibling);
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extern void parse_sibling_record(struct apfs_sibling_link_key *key,
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struct apfs_sibling_val *val, int len);
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extern void parse_sibling_map_record(struct apfs_sibling_map_key *key,
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struct apfs_sibling_map_val *val, int len);
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extern void check_xfield_flags(u8 flags);
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#endif /* _INODE_H */
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