312 строки
10 KiB
C
312 строки
10 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* inode.h - Defines for inode structures NTFS Linux kernel driver. Part of
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* the Linux-NTFS project.
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*
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* Copyright (c) 2001-2007 Anton Altaparmakov
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* Copyright (c) 2002 Richard Russon
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*/
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#ifndef _LINUX_NTFS_INODE_H
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#define _LINUX_NTFS_INODE_H
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#include <linux/atomic.h>
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#include <linux/fs.h>
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#include <linux/list.h>
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#include <linux/mm.h>
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#include <linux/mutex.h>
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#include <linux/seq_file.h>
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#include "layout.h"
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#include "volume.h"
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#include "types.h"
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#include "runlist.h"
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#include "debug.h"
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typedef struct _ntfs_inode ntfs_inode;
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/*
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* The NTFS in-memory inode structure. It is just used as an extension to the
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* fields already provided in the VFS inode.
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*/
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struct _ntfs_inode {
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rwlock_t size_lock; /* Lock serializing access to inode sizes. */
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s64 initialized_size; /* Copy from the attribute record. */
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s64 allocated_size; /* Copy from the attribute record. */
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unsigned long state; /* NTFS specific flags describing this inode.
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See ntfs_inode_state_bits below. */
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unsigned long mft_no; /* Number of the mft record / inode. */
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u16 seq_no; /* Sequence number of the mft record. */
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atomic_t count; /* Inode reference count for book keeping. */
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ntfs_volume *vol; /* Pointer to the ntfs volume of this inode. */
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/*
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* If NInoAttr() is true, the below fields describe the attribute which
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* this fake inode belongs to. The actual inode of this attribute is
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* pointed to by base_ntfs_ino and nr_extents is always set to -1 (see
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* below). For real inodes, we also set the type (AT_DATA for files and
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* AT_INDEX_ALLOCATION for directories), with the name = NULL and
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* name_len = 0 for files and name = I30 (global constant) and
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* name_len = 4 for directories.
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*/
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ATTR_TYPE type; /* Attribute type of this fake inode. */
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ntfschar *name; /* Attribute name of this fake inode. */
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u32 name_len; /* Attribute name length of this fake inode. */
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runlist runlist; /* If state has the NI_NonResident bit set,
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the runlist of the unnamed data attribute
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(if a file) or of the index allocation
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attribute (directory) or of the attribute
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described by the fake inode (if NInoAttr()).
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If runlist.rl is NULL, the runlist has not
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been read in yet or has been unmapped. If
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NI_NonResident is clear, the attribute is
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resident (file and fake inode) or there is
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no $I30 index allocation attribute
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(small directory). In the latter case
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runlist.rl is always NULL.*/
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/*
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* The following fields are only valid for real inodes and extent
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* inodes.
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*/
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struct mutex mrec_lock; /* Lock for serializing access to the
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mft record belonging to this inode. */
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struct page *page; /* The page containing the mft record of the
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inode. This should only be touched by the
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(un)map_mft_record*() functions. */
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int page_ofs; /* Offset into the page at which the mft record
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begins. This should only be touched by the
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(un)map_mft_record*() functions. */
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/*
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* Attribute list support (only for use by the attribute lookup
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* functions). Setup during read_inode for all inodes with attribute
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* lists. Only valid if NI_AttrList is set in state, and attr_list_rl is
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* further only valid if NI_AttrListNonResident is set.
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*/
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u32 attr_list_size; /* Length of attribute list value in bytes. */
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u8 *attr_list; /* Attribute list value itself. */
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runlist attr_list_rl; /* Run list for the attribute list value. */
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union {
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struct { /* It is a directory, $MFT, or an index inode. */
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u32 block_size; /* Size of an index block. */
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u32 vcn_size; /* Size of a vcn in this
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index. */
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COLLATION_RULE collation_rule; /* The collation rule
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for the index. */
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u8 block_size_bits; /* Log2 of the above. */
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u8 vcn_size_bits; /* Log2 of the above. */
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} index;
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struct { /* It is a compressed/sparse file/attribute inode. */
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s64 size; /* Copy of compressed_size from
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$DATA. */
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u32 block_size; /* Size of a compression block
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(cb). */
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u8 block_size_bits; /* Log2 of the size of a cb. */
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u8 block_clusters; /* Number of clusters per cb. */
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} compressed;
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} itype;
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struct mutex extent_lock; /* Lock for accessing/modifying the
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below . */
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s32 nr_extents; /* For a base mft record, the number of attached extent
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inodes (0 if none), for extent records and for fake
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inodes describing an attribute this is -1. */
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union { /* This union is only used if nr_extents != 0. */
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ntfs_inode **extent_ntfs_inos; /* For nr_extents > 0, array of
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the ntfs inodes of the extent
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mft records belonging to
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this base inode which have
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been loaded. */
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ntfs_inode *base_ntfs_ino; /* For nr_extents == -1, the
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ntfs inode of the base mft
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record. For fake inodes, the
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real (base) inode to which
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the attribute belongs. */
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} ext;
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};
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/*
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* Defined bits for the state field in the ntfs_inode structure.
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* (f) = files only, (d) = directories only, (a) = attributes/fake inodes only
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*/
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typedef enum {
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NI_Dirty, /* 1: Mft record needs to be written to disk. */
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NI_AttrList, /* 1: Mft record contains an attribute list. */
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NI_AttrListNonResident, /* 1: Attribute list is non-resident. Implies
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NI_AttrList is set. */
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NI_Attr, /* 1: Fake inode for attribute i/o.
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0: Real inode or extent inode. */
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NI_MstProtected, /* 1: Attribute is protected by MST fixups.
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0: Attribute is not protected by fixups. */
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NI_NonResident, /* 1: Unnamed data attr is non-resident (f).
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1: Attribute is non-resident (a). */
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NI_IndexAllocPresent = NI_NonResident, /* 1: $I30 index alloc attr is
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present (d). */
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NI_Compressed, /* 1: Unnamed data attr is compressed (f).
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1: Create compressed files by default (d).
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1: Attribute is compressed (a). */
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NI_Encrypted, /* 1: Unnamed data attr is encrypted (f).
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1: Create encrypted files by default (d).
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1: Attribute is encrypted (a). */
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NI_Sparse, /* 1: Unnamed data attr is sparse (f).
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1: Create sparse files by default (d).
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1: Attribute is sparse (a). */
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NI_SparseDisabled, /* 1: May not create sparse regions. */
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NI_TruncateFailed, /* 1: Last ntfs_truncate() call failed. */
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} ntfs_inode_state_bits;
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/*
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* NOTE: We should be adding dirty mft records to a list somewhere and they
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* should be independent of the (ntfs/vfs) inode structure so that an inode can
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* be removed but the record can be left dirty for syncing later.
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*/
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/*
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* Macro tricks to expand the NInoFoo(), NInoSetFoo(), and NInoClearFoo()
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* functions.
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*/
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#define NINO_FNS(flag) \
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static inline int NIno##flag(ntfs_inode *ni) \
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{ \
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return test_bit(NI_##flag, &(ni)->state); \
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} \
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static inline void NInoSet##flag(ntfs_inode *ni) \
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{ \
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set_bit(NI_##flag, &(ni)->state); \
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} \
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static inline void NInoClear##flag(ntfs_inode *ni) \
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{ \
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clear_bit(NI_##flag, &(ni)->state); \
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}
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/*
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* As above for NInoTestSetFoo() and NInoTestClearFoo().
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*/
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#define TAS_NINO_FNS(flag) \
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static inline int NInoTestSet##flag(ntfs_inode *ni) \
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{ \
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return test_and_set_bit(NI_##flag, &(ni)->state); \
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} \
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static inline int NInoTestClear##flag(ntfs_inode *ni) \
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{ \
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return test_and_clear_bit(NI_##flag, &(ni)->state); \
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}
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/* Emit the ntfs inode bitops functions. */
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NINO_FNS(Dirty)
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TAS_NINO_FNS(Dirty)
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NINO_FNS(AttrList)
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NINO_FNS(AttrListNonResident)
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NINO_FNS(Attr)
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NINO_FNS(MstProtected)
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NINO_FNS(NonResident)
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NINO_FNS(IndexAllocPresent)
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NINO_FNS(Compressed)
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NINO_FNS(Encrypted)
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NINO_FNS(Sparse)
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NINO_FNS(SparseDisabled)
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NINO_FNS(TruncateFailed)
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/*
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* The full structure containing a ntfs_inode and a vfs struct inode. Used for
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* all real and fake inodes but not for extent inodes which lack the vfs struct
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* inode.
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*/
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typedef struct {
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ntfs_inode ntfs_inode;
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struct inode vfs_inode; /* The vfs inode structure. */
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} big_ntfs_inode;
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/**
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* NTFS_I - return the ntfs inode given a vfs inode
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* @inode: VFS inode
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*
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* NTFS_I() returns the ntfs inode associated with the VFS @inode.
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*/
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static inline ntfs_inode *NTFS_I(struct inode *inode)
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{
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return (ntfs_inode *)container_of(inode, big_ntfs_inode, vfs_inode);
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}
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static inline struct inode *VFS_I(ntfs_inode *ni)
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{
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return &((big_ntfs_inode *)ni)->vfs_inode;
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}
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/**
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* ntfs_attr - ntfs in memory attribute structure
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* @mft_no: mft record number of the base mft record of this attribute
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* @name: Unicode name of the attribute (NULL if unnamed)
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* @name_len: length of @name in Unicode characters (0 if unnamed)
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* @type: attribute type (see layout.h)
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*
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* This structure exists only to provide a small structure for the
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* ntfs_{attr_}iget()/ntfs_test_inode()/ntfs_init_locked_inode() mechanism.
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*
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* NOTE: Elements are ordered by size to make the structure as compact as
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* possible on all architectures.
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*/
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typedef struct {
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unsigned long mft_no;
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ntfschar *name;
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u32 name_len;
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ATTR_TYPE type;
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} ntfs_attr;
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typedef int (*test_t)(struct inode *, void *);
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extern int ntfs_test_inode(struct inode *vi, ntfs_attr *na);
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extern struct inode *ntfs_iget(struct super_block *sb, unsigned long mft_no);
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extern struct inode *ntfs_attr_iget(struct inode *base_vi, ATTR_TYPE type,
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ntfschar *name, u32 name_len);
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extern struct inode *ntfs_index_iget(struct inode *base_vi, ntfschar *name,
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u32 name_len);
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extern struct inode *ntfs_alloc_big_inode(struct super_block *sb);
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extern void ntfs_free_big_inode(struct inode *inode);
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extern void ntfs_evict_big_inode(struct inode *vi);
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extern void __ntfs_init_inode(struct super_block *sb, ntfs_inode *ni);
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static inline void ntfs_init_big_inode(struct inode *vi)
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{
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ntfs_inode *ni = NTFS_I(vi);
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ntfs_debug("Entering.");
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__ntfs_init_inode(vi->i_sb, ni);
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ni->mft_no = vi->i_ino;
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}
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extern ntfs_inode *ntfs_new_extent_inode(struct super_block *sb,
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unsigned long mft_no);
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extern void ntfs_clear_extent_inode(ntfs_inode *ni);
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extern int ntfs_read_inode_mount(struct inode *vi);
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extern int ntfs_show_options(struct seq_file *sf, struct dentry *root);
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#ifdef NTFS_RW
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extern int ntfs_truncate(struct inode *vi);
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extern void ntfs_truncate_vfs(struct inode *vi);
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extern int ntfs_setattr(struct dentry *dentry, struct iattr *attr);
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extern int __ntfs_write_inode(struct inode *vi, int sync);
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static inline void ntfs_commit_inode(struct inode *vi)
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{
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if (!is_bad_inode(vi))
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__ntfs_write_inode(vi, 1);
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return;
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}
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#else
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static inline void ntfs_truncate_vfs(struct inode *vi) {}
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#endif /* NTFS_RW */
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#endif /* _LINUX_NTFS_INODE_H */
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