inode.h (10560B)
1/* SPDX-License-Identifier: GPL-2.0-or-later */ 2/* 3 * inode.h - Defines for inode structures NTFS Linux kernel driver. Part of 4 * the Linux-NTFS project. 5 * 6 * Copyright (c) 2001-2007 Anton Altaparmakov 7 * Copyright (c) 2002 Richard Russon 8 */ 9 10#ifndef _LINUX_NTFS_INODE_H 11#define _LINUX_NTFS_INODE_H 12 13#include <linux/atomic.h> 14 15#include <linux/fs.h> 16#include <linux/list.h> 17#include <linux/mm.h> 18#include <linux/mutex.h> 19#include <linux/seq_file.h> 20 21#include "layout.h" 22#include "volume.h" 23#include "types.h" 24#include "runlist.h" 25#include "debug.h" 26 27typedef struct _ntfs_inode ntfs_inode; 28 29/* 30 * The NTFS in-memory inode structure. It is just used as an extension to the 31 * fields already provided in the VFS inode. 32 */ 33struct _ntfs_inode { 34 rwlock_t size_lock; /* Lock serializing access to inode sizes. */ 35 s64 initialized_size; /* Copy from the attribute record. */ 36 s64 allocated_size; /* Copy from the attribute record. */ 37 unsigned long state; /* NTFS specific flags describing this inode. 38 See ntfs_inode_state_bits below. */ 39 unsigned long mft_no; /* Number of the mft record / inode. */ 40 u16 seq_no; /* Sequence number of the mft record. */ 41 atomic_t count; /* Inode reference count for book keeping. */ 42 ntfs_volume *vol; /* Pointer to the ntfs volume of this inode. */ 43 /* 44 * If NInoAttr() is true, the below fields describe the attribute which 45 * this fake inode belongs to. The actual inode of this attribute is 46 * pointed to by base_ntfs_ino and nr_extents is always set to -1 (see 47 * below). For real inodes, we also set the type (AT_DATA for files and 48 * AT_INDEX_ALLOCATION for directories), with the name = NULL and 49 * name_len = 0 for files and name = I30 (global constant) and 50 * name_len = 4 for directories. 51 */ 52 ATTR_TYPE type; /* Attribute type of this fake inode. */ 53 ntfschar *name; /* Attribute name of this fake inode. */ 54 u32 name_len; /* Attribute name length of this fake inode. */ 55 runlist runlist; /* If state has the NI_NonResident bit set, 56 the runlist of the unnamed data attribute 57 (if a file) or of the index allocation 58 attribute (directory) or of the attribute 59 described by the fake inode (if NInoAttr()). 60 If runlist.rl is NULL, the runlist has not 61 been read in yet or has been unmapped. If 62 NI_NonResident is clear, the attribute is 63 resident (file and fake inode) or there is 64 no $I30 index allocation attribute 65 (small directory). In the latter case 66 runlist.rl is always NULL.*/ 67 /* 68 * The following fields are only valid for real inodes and extent 69 * inodes. 70 */ 71 struct mutex mrec_lock; /* Lock for serializing access to the 72 mft record belonging to this inode. */ 73 struct page *page; /* The page containing the mft record of the 74 inode. This should only be touched by the 75 (un)map_mft_record*() functions. */ 76 int page_ofs; /* Offset into the page at which the mft record 77 begins. This should only be touched by the 78 (un)map_mft_record*() functions. */ 79 /* 80 * Attribute list support (only for use by the attribute lookup 81 * functions). Setup during read_inode for all inodes with attribute 82 * lists. Only valid if NI_AttrList is set in state, and attr_list_rl is 83 * further only valid if NI_AttrListNonResident is set. 84 */ 85 u32 attr_list_size; /* Length of attribute list value in bytes. */ 86 u8 *attr_list; /* Attribute list value itself. */ 87 runlist attr_list_rl; /* Run list for the attribute list value. */ 88 union { 89 struct { /* It is a directory, $MFT, or an index inode. */ 90 u32 block_size; /* Size of an index block. */ 91 u32 vcn_size; /* Size of a vcn in this 92 index. */ 93 COLLATION_RULE collation_rule; /* The collation rule 94 for the index. */ 95 u8 block_size_bits; /* Log2 of the above. */ 96 u8 vcn_size_bits; /* Log2 of the above. */ 97 } index; 98 struct { /* It is a compressed/sparse file/attribute inode. */ 99 s64 size; /* Copy of compressed_size from 100 $DATA. */ 101 u32 block_size; /* Size of a compression block 102 (cb). */ 103 u8 block_size_bits; /* Log2 of the size of a cb. */ 104 u8 block_clusters; /* Number of clusters per cb. */ 105 } compressed; 106 } itype; 107 struct mutex extent_lock; /* Lock for accessing/modifying the 108 below . */ 109 s32 nr_extents; /* For a base mft record, the number of attached extent 110 inodes (0 if none), for extent records and for fake 111 inodes describing an attribute this is -1. */ 112 union { /* This union is only used if nr_extents != 0. */ 113 ntfs_inode **extent_ntfs_inos; /* For nr_extents > 0, array of 114 the ntfs inodes of the extent 115 mft records belonging to 116 this base inode which have 117 been loaded. */ 118 ntfs_inode *base_ntfs_ino; /* For nr_extents == -1, the 119 ntfs inode of the base mft 120 record. For fake inodes, the 121 real (base) inode to which 122 the attribute belongs. */ 123 } ext; 124}; 125 126/* 127 * Defined bits for the state field in the ntfs_inode structure. 128 * (f) = files only, (d) = directories only, (a) = attributes/fake inodes only 129 */ 130typedef enum { 131 NI_Dirty, /* 1: Mft record needs to be written to disk. */ 132 NI_AttrList, /* 1: Mft record contains an attribute list. */ 133 NI_AttrListNonResident, /* 1: Attribute list is non-resident. Implies 134 NI_AttrList is set. */ 135 136 NI_Attr, /* 1: Fake inode for attribute i/o. 137 0: Real inode or extent inode. */ 138 139 NI_MstProtected, /* 1: Attribute is protected by MST fixups. 140 0: Attribute is not protected by fixups. */ 141 NI_NonResident, /* 1: Unnamed data attr is non-resident (f). 142 1: Attribute is non-resident (a). */ 143 NI_IndexAllocPresent = NI_NonResident, /* 1: $I30 index alloc attr is 144 present (d). */ 145 NI_Compressed, /* 1: Unnamed data attr is compressed (f). 146 1: Create compressed files by default (d). 147 1: Attribute is compressed (a). */ 148 NI_Encrypted, /* 1: Unnamed data attr is encrypted (f). 149 1: Create encrypted files by default (d). 150 1: Attribute is encrypted (a). */ 151 NI_Sparse, /* 1: Unnamed data attr is sparse (f). 152 1: Create sparse files by default (d). 153 1: Attribute is sparse (a). */ 154 NI_SparseDisabled, /* 1: May not create sparse regions. */ 155 NI_TruncateFailed, /* 1: Last ntfs_truncate() call failed. */ 156} ntfs_inode_state_bits; 157 158/* 159 * NOTE: We should be adding dirty mft records to a list somewhere and they 160 * should be independent of the (ntfs/vfs) inode structure so that an inode can 161 * be removed but the record can be left dirty for syncing later. 162 */ 163 164/* 165 * Macro tricks to expand the NInoFoo(), NInoSetFoo(), and NInoClearFoo() 166 * functions. 167 */ 168#define NINO_FNS(flag) \ 169static inline int NIno##flag(ntfs_inode *ni) \ 170{ \ 171 return test_bit(NI_##flag, &(ni)->state); \ 172} \ 173static inline void NInoSet##flag(ntfs_inode *ni) \ 174{ \ 175 set_bit(NI_##flag, &(ni)->state); \ 176} \ 177static inline void NInoClear##flag(ntfs_inode *ni) \ 178{ \ 179 clear_bit(NI_##flag, &(ni)->state); \ 180} 181 182/* 183 * As above for NInoTestSetFoo() and NInoTestClearFoo(). 184 */ 185#define TAS_NINO_FNS(flag) \ 186static inline int NInoTestSet##flag(ntfs_inode *ni) \ 187{ \ 188 return test_and_set_bit(NI_##flag, &(ni)->state); \ 189} \ 190static inline int NInoTestClear##flag(ntfs_inode *ni) \ 191{ \ 192 return test_and_clear_bit(NI_##flag, &(ni)->state); \ 193} 194 195/* Emit the ntfs inode bitops functions. */ 196NINO_FNS(Dirty) 197TAS_NINO_FNS(Dirty) 198NINO_FNS(AttrList) 199NINO_FNS(AttrListNonResident) 200NINO_FNS(Attr) 201NINO_FNS(MstProtected) 202NINO_FNS(NonResident) 203NINO_FNS(IndexAllocPresent) 204NINO_FNS(Compressed) 205NINO_FNS(Encrypted) 206NINO_FNS(Sparse) 207NINO_FNS(SparseDisabled) 208NINO_FNS(TruncateFailed) 209 210/* 211 * The full structure containing a ntfs_inode and a vfs struct inode. Used for 212 * all real and fake inodes but not for extent inodes which lack the vfs struct 213 * inode. 214 */ 215typedef struct { 216 ntfs_inode ntfs_inode; 217 struct inode vfs_inode; /* The vfs inode structure. */ 218} big_ntfs_inode; 219 220/** 221 * NTFS_I - return the ntfs inode given a vfs inode 222 * @inode: VFS inode 223 * 224 * NTFS_I() returns the ntfs inode associated with the VFS @inode. 225 */ 226static inline ntfs_inode *NTFS_I(struct inode *inode) 227{ 228 return (ntfs_inode *)container_of(inode, big_ntfs_inode, vfs_inode); 229} 230 231static inline struct inode *VFS_I(ntfs_inode *ni) 232{ 233 return &((big_ntfs_inode *)ni)->vfs_inode; 234} 235 236/** 237 * ntfs_attr - ntfs in memory attribute structure 238 * @mft_no: mft record number of the base mft record of this attribute 239 * @name: Unicode name of the attribute (NULL if unnamed) 240 * @name_len: length of @name in Unicode characters (0 if unnamed) 241 * @type: attribute type (see layout.h) 242 * 243 * This structure exists only to provide a small structure for the 244 * ntfs_{attr_}iget()/ntfs_test_inode()/ntfs_init_locked_inode() mechanism. 245 * 246 * NOTE: Elements are ordered by size to make the structure as compact as 247 * possible on all architectures. 248 */ 249typedef struct { 250 unsigned long mft_no; 251 ntfschar *name; 252 u32 name_len; 253 ATTR_TYPE type; 254} ntfs_attr; 255 256extern int ntfs_test_inode(struct inode *vi, void *data); 257 258extern struct inode *ntfs_iget(struct super_block *sb, unsigned long mft_no); 259extern struct inode *ntfs_attr_iget(struct inode *base_vi, ATTR_TYPE type, 260 ntfschar *name, u32 name_len); 261extern struct inode *ntfs_index_iget(struct inode *base_vi, ntfschar *name, 262 u32 name_len); 263 264extern struct inode *ntfs_alloc_big_inode(struct super_block *sb); 265extern void ntfs_free_big_inode(struct inode *inode); 266extern void ntfs_evict_big_inode(struct inode *vi); 267 268extern void __ntfs_init_inode(struct super_block *sb, ntfs_inode *ni); 269 270static inline void ntfs_init_big_inode(struct inode *vi) 271{ 272 ntfs_inode *ni = NTFS_I(vi); 273 274 ntfs_debug("Entering."); 275 __ntfs_init_inode(vi->i_sb, ni); 276 ni->mft_no = vi->i_ino; 277} 278 279extern ntfs_inode *ntfs_new_extent_inode(struct super_block *sb, 280 unsigned long mft_no); 281extern void ntfs_clear_extent_inode(ntfs_inode *ni); 282 283extern int ntfs_read_inode_mount(struct inode *vi); 284 285extern int ntfs_show_options(struct seq_file *sf, struct dentry *root); 286 287#ifdef NTFS_RW 288 289extern int ntfs_truncate(struct inode *vi); 290extern void ntfs_truncate_vfs(struct inode *vi); 291 292extern int ntfs_setattr(struct user_namespace *mnt_userns, 293 struct dentry *dentry, struct iattr *attr); 294 295extern int __ntfs_write_inode(struct inode *vi, int sync); 296 297static inline void ntfs_commit_inode(struct inode *vi) 298{ 299 if (!is_bad_inode(vi)) 300 __ntfs_write_inode(vi, 1); 301 return; 302} 303 304#else 305 306static inline void ntfs_truncate_vfs(struct inode *vi) {} 307 308#endif /* NTFS_RW */ 309 310#endif /* _LINUX_NTFS_INODE_H */