#include <ext4_types.h>
#include <ext4_inode.h>
-
-/*
- * Array of ext4_ext_path contains path to some extent.
- * Creation/lookup routines use it for traversal/splitting/etc.
- * Truncate uses it to simulate recursive walking.
- */
-struct ext4_extent_path {
- ext4_fsblk_t p_block;
- struct ext4_block block;
- int32_t depth;
- int32_t maxdepth;
- struct ext4_extent_header *header;
- struct ext4_extent_index *index;
- struct ext4_extent *extent;
-
-};
-
-
-/**@brief Get logical number of the block covered by extent.
- * @param extent Extent to load number from
- * @return Logical number of the first block covered by extent */
-static inline uint32_t ext4_extent_get_first_block(struct ext4_extent *extent)
-{
- return to_le32(extent->first_block);
-}
-
-/**@brief Set logical number of the first block covered by extent.
- * @param extent Extent to set number to
- * @param iblock Logical number of the first block covered by extent */
-static inline void ext4_extent_set_first_block(struct ext4_extent *extent,
- uint32_t iblock)
-{
- extent->first_block = to_le32(iblock);
-}
-
-/**@brief Get number of blocks covered by extent.
- * @param extent Extent to load count from
- * @return Number of blocks covered by extent */
-static inline uint16_t ext4_extent_get_block_count(struct ext4_extent *extent)
-{
- if (EXT4_EXT_IS_UNWRITTEN(extent))
- return EXT4_EXT_GET_LEN_UNWRITTEN(extent);
- else
- return EXT4_EXT_GET_LEN(extent);
-}
-/**@brief Set number of blocks covered by extent.
- * @param extent Extent to load count from
- * @param count Number of blocks covered by extent
- * @param unwritten Whether the extent is unwritten or not */
-static inline void ext4_extent_set_block_count(struct ext4_extent *extent,
- uint16_t count, bool unwritten)
-{
- EXT4_EXT_SET_LEN(extent, count);
- if (unwritten)
- EXT4_EXT_SET_UNWRITTEN(extent);
-}
-
-/**@brief Get physical number of the first block covered by extent.
- * @param extent Extent to load number
- * @return Physical number of the first block covered by extent */
-static inline uint64_t ext4_extent_get_start(struct ext4_extent *extent)
-{
- return ((uint64_t)to_le16(extent->start_hi)) << 32 |
- ((uint64_t)to_le32(extent->start_lo));
-}
-
-
-/**@brief Set physical number of the first block covered by extent.
- * @param extent Extent to load number
- * @param fblock Physical number of the first block covered by extent */
-static inline void ext4_extent_set_start(struct ext4_extent *extent, uint64_t fblock)
-{
- extent->start_lo = to_le32((fblock << 32) >> 32);
- extent->start_hi = to_le16((uint16_t)(fblock >> 32));
-}
-
-
-/**@brief Get logical number of the block covered by extent index.
- * @param index Extent index to load number from
- * @return Logical number of the first block covered by extent index */
-static inline uint32_t
-ext4_extent_index_get_first_block(struct ext4_extent_index *index)
-{
- return to_le32(index->first_block);
-}
-
-/**@brief Set logical number of the block covered by extent index.
- * @param index Extent index to set number to
- * @param iblock Logical number of the first block covered by extent index */
-static inline void
-ext4_extent_index_set_first_block(struct ext4_extent_index *index,
- uint32_t iblock)
-{
- index->first_block = to_le32(iblock);
-}
-
-/**@brief Get physical number of block where the child node is located.
- * @param index Extent index to load number from
- * @return Physical number of the block with child node */
-static inline uint64_t
-ext4_extent_index_get_leaf(struct ext4_extent_index *index)
-{
- return ((uint64_t)to_le16(index->leaf_hi)) << 32 |
- ((uint64_t)to_le32(index->leaf_lo));
-}
-
-/**@brief Set physical number of block where the child node is located.
- * @param index Extent index to set number to
- * @param fblock Ohysical number of the block with child node */
-static inline void ext4_extent_index_set_leaf(struct ext4_extent_index *index,
- uint64_t fblock)
-{
- index->leaf_lo = to_le32((fblock << 32) >> 32);
- index->leaf_hi = to_le16((uint16_t)(fblock >> 32));
-}
-
-/**@brief Get magic value from extent header.
- * @param header Extent header to load value from
- * @return Magic value of extent header */
-static inline uint16_t
-ext4_extent_header_get_magic(struct ext4_extent_header *header)
-{
- return to_le16(header->magic);
-}
-
-/**@brief Set magic value to extent header.
- * @param header Extent header to set value to
- * @param magic Magic value of extent header */
-static inline void ext4_extent_header_set_magic(struct ext4_extent_header *header,
- uint16_t magic)
-{
- header->magic = to_le16(magic);
-}
-
-/**@brief Get number of entries from extent header
- * @param header Extent header to get value from
- * @return Number of entries covered by extent header */
-static inline uint16_t
-ext4_extent_header_get_entries_count(struct ext4_extent_header *header)
-{
- return to_le16(header->entries_count);
-}
-
-/**@brief Set number of entries to extent header
- * @param header Extent header to set value to
- * @param count Number of entries covered by extent header */
-static inline void
-ext4_extent_header_set_entries_count(struct ext4_extent_header *header,
- uint16_t count)
-{
- header->entries_count = to_le16(count);
-}
-
-/**@brief Get maximum number of entries from extent header
- * @param header Extent header to get value from
- * @return Maximum number of entries covered by extent header */
-static inline uint16_t
-ext4_extent_header_get_max_entries_count(struct ext4_extent_header *header)
-{
- return to_le16(header->max_entries_count);
-}
-
-/**@brief Set maximum number of entries to extent header
- * @param header Extent header to set value to
- * @param max_count Maximum number of entries covered by extent header */
-static inline void
-ext4_extent_header_set_max_entries_count(struct ext4_extent_header *header,
- uint16_t max_count)
-{
- header->max_entries_count = to_le16(max_count);
-}
-
-/**@brief Get depth of extent subtree.
- * @param header Extent header to get value from
- * @return Depth of extent subtree */
-static inline uint16_t
-ext4_extent_header_get_depth(struct ext4_extent_header *header)
-{
- return to_le16(header->depth);
-}
-
-/**@brief Set depth of extent subtree.
- * @param header Extent header to set value to
- * @param depth Depth of extent subtree */
-static inline void
-ext4_extent_header_set_depth(struct ext4_extent_header *header, uint16_t depth)
-{
- header->depth = to_le16(depth);
-}
-
-/**@brief Get generation from extent header
- * @param header Extent header to get value from
- * @return Generation */
-static inline uint32_t
-ext4_extent_header_get_generation(struct ext4_extent_header *header)
-{
- return to_le32(header->generation);
-}
-
-/**@brief Set generation to extent header
- * @param header Extent header to set value to
- * @param generation Generation */
-static inline void
-ext4_extent_header_set_generation(struct ext4_extent_header *header,
- uint32_t generation)
-{
- header->generation = to_le32(generation);
-}
-
-/******************************************************************************/
-
-/**TODO: */
-static inline void ext4_extent_tree_init(struct ext4_inode_ref *inode_ref)
-{
- /* Initialize extent root header */
- struct ext4_extent_header *header =
- ext4_inode_get_extent_header(inode_ref->inode);
- ext4_extent_header_set_depth(header, 0);
- ext4_extent_header_set_entries_count(header, 0);
- ext4_extent_header_set_generation(header, 0);
- ext4_extent_header_set_magic(header, EXT4_EXTENT_MAGIC);
-
- uint16_t max_entries = (EXT4_INODE_BLOCKS * sizeof(uint32_t) -
- sizeof(struct ext4_extent_header)) /
- sizeof(struct ext4_extent);
-
- ext4_extent_header_set_max_entries_count(header, max_entries);
- inode_ref->dirty = true;
-}
-
+void ext4_extent_tree_init(struct ext4_inode_ref *inode_ref);
-/**TODO: */
int ext4_extent_get_blocks(struct ext4_inode_ref *inode_ref, ext4_lblk_t iblock,
uint32_t max_blocks, ext4_fsblk_t *result, bool create,
uint32_t *blocks_count);
#define EXT4_JOURNAL_INO 8
#define EXT4_GOOD_OLD_FIRST_INO 11
-
-#define EXT4_EXT_UNWRITTEN_MASK (1L << 15)
-
-#define EXT4_EXT_MAX_LEN_WRITTEN (1L << 15)
-#define EXT4_EXT_MAX_LEN_UNWRITTEN \
- (EXT4_EXT_MAX_LEN_WRITTEN - 1)
-
-#define EXT4_EXT_GET_LEN(ex) to_le16((ex)->block_count)
-#define EXT4_EXT_GET_LEN_UNWRITTEN(ex) \
- (EXT4_EXT_GET_LEN(ex) &= ~(EXT4_EXT_UNWRITTEN_MASK))
-#define EXT4_EXT_SET_LEN(ex, count) \
- ((ex)->block_count = to_le16(count))
-
-#define EXT4_EXT_IS_UNWRITTEN(ex) \
- (EXT4_EXT_GET_LEN(ex) > EXT4_EXT_MAX_LEN_WRITTEN)
-#define EXT4_EXT_SET_UNWRITTEN(ex) \
- ((ex)->block_count |= to_le16(EXT4_EXT_UNWRITTEN_MASK))
-#define EXT4_EXT_SET_WRITTEN(ex) \
- ((ex)->block_count &= ~(to_le16(EXT4_EXT_UNWRITTEN_MASK)))
-
-#pragma pack(push, 1)
-
-/*
- * This is the extent tail on-disk structure.
- * All other extent structures are 12 bytes long. It turns out that
- * block_size % 12 >= 4 for at least all powers of 2 greater than 512, which
- * covers all valid ext4 block sizes. Therefore, this tail structure can be
- * crammed into the end of the block without having to rebalance the tree.
- */
-struct ext4_extent_tail
-{
- uint32_t et_checksum; /* crc32c(uuid+inum+extent_block) */
-};
-
-/*
- * This is the extent on-disk structure.
- * It's used at the bottom of the tree.
- */
-struct ext4_extent {
- uint32_t first_block; /* First logical block extent covers */
- uint16_t block_count; /* Number of blocks covered by extent */
- uint16_t start_hi; /* High 16 bits of physical block */
- uint32_t start_lo; /* Low 32 bits of physical block */
-};
-
-/*
- * This is index on-disk structure.
- * It's used at all the levels except the bottom.
- */
-struct ext4_extent_index {
- uint32_t first_block; /* Index covers logical blocks from 'block' */
-
- /**
- * Pointer to the physical block of the next
- * level. leaf or next index could be there
- * high 16 bits of physical block
- */
- uint32_t leaf_lo;
- uint16_t leaf_hi;
- uint16_t padding;
-};
-
-/*
- * Each block (leaves and indexes), even inode-stored has header.
- */
-struct ext4_extent_header {
- uint16_t magic;
- uint16_t entries_count; /* Number of valid entries */
- uint16_t max_entries_count; /* Capacity of store in entries */
- uint16_t depth; /* Has tree real underlying blocks? */
- uint32_t generation; /* generation of the tree */
-};
-
-#pragma pack(pop)
-
-
-#define EXT4_EXTENT_MAGIC 0xF30A
-
-#define EXT4_EXTENT_FIRST(header) \
- ((struct ext4_extent *)(((char *)(header)) + \
- sizeof(struct ext4_extent_header)))
-
-#define EXT4_EXTENT_FIRST_INDEX(header) \
- ((struct ext4_extent_index *)(((char *)(header)) + \
- sizeof(struct ext4_extent_header)))
-
-/*
- * EXT_INIT_MAX_LEN is the maximum number of blocks we can have in an
- * initialized extent. This is 2^15 and not (2^16 - 1), since we use the
- * MSB of ee_len field in the extent datastructure to signify if this
- * particular extent is an initialized extent or an uninitialized (i.e.
- * preallocated).
- * EXT_UNINIT_MAX_LEN is the maximum number of blocks we can have in an
- * uninitialized extent.
- * If ee_len is <= 0x8000, it is an initialized extent. Otherwise, it is an
- * uninitialized one. In other words, if MSB of ee_len is set, it is an
- * uninitialized extent with only one special scenario when ee_len = 0x8000.
- * In this case we can not have an uninitialized extent of zero length and
- * thus we make it as a special case of initialized extent with 0x8000 length.
- * This way we get better extent-to-group alignment for initialized extents.
- * Hence, the maximum number of blocks we can have in an *initialized*
- * extent is 2^15 (32768) and in an *uninitialized* extent is 2^15-1 (32767).
- */
-#define EXT_INIT_MAX_LEN (1L << 15)
-#define EXT_UNWRITTEN_MAX_LEN (EXT_INIT_MAX_LEN - 1)
-
-#define EXT_EXTENT_SIZE sizeof(struct ext4_extent)
-#define EXT_INDEX_SIZE sizeof(struct ext4_extent_idx)
-
-#define EXT_FIRST_EXTENT(__hdr__) \
- ((struct ext4_extent *)(((char *)(__hdr__)) + \
- sizeof(struct ext4_extent_header)))
-#define EXT_FIRST_INDEX(__hdr__) \
- ((struct ext4_extent_index *)(((char *)(__hdr__)) + \
- sizeof(struct ext4_extent_header)))
-#define EXT_HAS_FREE_INDEX(__path__) \
- (to_le16((__path__)->header->entries_count) < \
- to_le16((__path__)->header->max_entries_count))
-#define EXT_LAST_EXTENT(__hdr__) \
- (EXT_FIRST_EXTENT((__hdr__)) + to_le16((__hdr__)->entries_count) - 1)
-#define EXT_LAST_INDEX(__hdr__) \
- (EXT_FIRST_INDEX((__hdr__)) + to_le16((__hdr__)->entries_count) - 1)
-#define EXT_MAX_EXTENT(__hdr__) \
- (EXT_FIRST_EXTENT((__hdr__)) + to_le16((__hdr__)->max_entries_count) - 1)
-#define EXT_MAX_INDEX(__hdr__) \
- (EXT_FIRST_INDEX((__hdr__)) + to_le16((__hdr__)->max_entries_count) - 1)
-
-#define EXT4_EXTENT_TAIL_OFFSET(hdr) \
- (sizeof(struct ext4_extent_header) + \
- (sizeof(struct ext4_extent) * to_le16((hdr)->max_entries_count)))
-
-/*
- * ext4_ext_next_allocated_block:
- * returns allocated block in subsequent extent or EXT_MAX_BLOCKS.
- * NOTE: it considers block number from index entry as
- * allocated block. Thus, index entries have to be consistent
- * with leaves.
- */
#define EXT_MAX_BLOCKS (ext4_lblk_t) (-1)
-
#define IN_RANGE(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
#define EXT2_HTREE_EOF 0x7FFFFFFFUL
-
-/* Extended Attribute(EA) */
-
-/* Magic value in attribute blocks */
-#define EXT4_XATTR_MAGIC 0xEA020000
-
-/* Maximum number of references to one attribute block */
-#define EXT4_XATTR_REFCOUNT_MAX 1024
-
-/* Name indexes */
-#define EXT4_XATTR_INDEX_USER 1
-#define EXT4_XATTR_INDEX_POSIX_ACL_ACCESS 2
-#define EXT4_XATTR_INDEX_POSIX_ACL_DEFAULT 3
-#define EXT4_XATTR_INDEX_TRUSTED 4
-#define EXT4_XATTR_INDEX_LUSTRE 5
-#define EXT4_XATTR_INDEX_SECURITY 6
-#define EXT4_XATTR_INDEX_SYSTEM 7
-#define EXT4_XATTR_INDEX_RICHACL 8
-#define EXT4_XATTR_INDEX_ENCRYPTION 9
-
-#pragma pack(push, 1)
-
-struct ext4_xattr_header {
- uint32_t h_magic; /* magic number for identification */
- uint32_t h_refcount; /* reference count */
- uint32_t h_blocks; /* number of disk blocks used */
- uint32_t h_hash; /* hash value of all attributes */
- uint32_t h_checksum; /* crc32c(uuid+id+xattrblock) */
- /* id = inum if refcount=1, blknum otherwise */
- uint32_t h_reserved[3]; /* zero right now */
-};
-
-struct ext4_xattr_ibody_header {
- uint32_t h_magic; /* magic number for identification */
-};
-
-struct ext4_xattr_entry {
- uint8_t e_name_len; /* length of name */
- uint8_t e_name_index; /* attribute name index */
- uint16_t e_value_offs; /* offset in disk block of value */
- uint32_t e_value_block; /* disk block attribute is stored on (n/i) */
- uint32_t e_value_size; /* size of attribute value */
- uint32_t e_hash; /* hash value of name and value */
-};
-
-#pragma pack(pop)
-
#define EXT4_GOOD_OLD_INODE_SIZE 128
/*****************************************************************************/
bool not_found;
};
-#define EXT4_XATTR_PAD_BITS 2
-#define EXT4_XATTR_PAD (1 << EXT4_XATTR_PAD_BITS)
-#define EXT4_XATTR_ROUND (EXT4_XATTR_PAD - 1)
-#define EXT4_XATTR_LEN(name_len) \
- (((name_len) + EXT4_XATTR_ROUND + sizeof(struct ext4_xattr_entry)) & \
- ~EXT4_XATTR_ROUND)
-#define EXT4_XATTR_NEXT(entry) \
- ((struct ext4_xattr_entry *)((char *)(entry) + \
- EXT4_XATTR_LEN((entry)->e_name_len)))
-#define EXT4_XATTR_SIZE(size) (((size) + EXT4_XATTR_ROUND) & ~EXT4_XATTR_ROUND)
-#define EXT4_XATTR_NAME(entry) ((char *)((entry) + 1))
-
-#define EXT4_XATTR_IHDR(sb, raw_inode) \
- ((struct ext4_xattr_ibody_header *)((char *)raw_inode + \
- EXT4_GOOD_OLD_INODE_SIZE + \
- ext4_inode_get_extra_isize( \
- sb, raw_inode)))
-#define EXT4_XATTR_IFIRST(hdr) ((struct ext4_xattr_entry *)((hdr) + 1))
-
-#define EXT4_XATTR_BHDR(block) ((struct ext4_xattr_header *)((block)->data))
-#define EXT4_XATTR_ENTRY(ptr) ((struct ext4_xattr_entry *)(ptr))
-#define EXT4_XATTR_BFIRST(block) EXT4_XATTR_ENTRY(EXT4_XATTR_BHDR(block) + 1)
-#define EXT4_XATTR_IS_LAST_ENTRY(entry) (*(uint32_t *)(entry) == 0)
-
-#define EXT4_ZERO_XATTR_VALUE ((void *)-1)
-
const char *ext4_extract_xattr_name(const char *full_name, size_t full_name_len,
uint8_t *name_index, size_t *name_len,
bool *found);
/*
- * Copyright (c) 2015 Grzegorz Kostka (kostka.grzegorz@gmail.com)
- * Copyright (c) 2015 Kaho Ng (ngkaho1234@gmail.com)
+ * Copyright (c) 2017 Grzegorz Kostka (kostka.grzegorz@gmail.com)
+ * Copyright (c) 2017 Kaho Ng (ngkaho1234@gmail.com)
*
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * - Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * - Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * - The name of the author may not be used to endorse or promote products
- * derived from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
- * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
- * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
- * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
*/
#include <ext4_config.h>
#define EXT4_EXT_DATA_VALID2 0x10 /* second half contains valid data */
#define EXT4_EXT_NO_COMBINE 0x20 /* do not combine two extents */
+#define EXT4_EXT_UNWRITTEN_MASK (1L << 15)
+
+#define EXT4_EXT_MAX_LEN_WRITTEN (1L << 15)
+#define EXT4_EXT_MAX_LEN_UNWRITTEN \
+ (EXT4_EXT_MAX_LEN_WRITTEN - 1)
+
+#define EXT4_EXT_GET_LEN(ex) to_le16((ex)->block_count)
+#define EXT4_EXT_GET_LEN_UNWRITTEN(ex) \
+ (EXT4_EXT_GET_LEN(ex) &= ~(EXT4_EXT_UNWRITTEN_MASK))
+#define EXT4_EXT_SET_LEN(ex, count) \
+ ((ex)->block_count = to_le16(count))
+
+#define EXT4_EXT_IS_UNWRITTEN(ex) \
+ (EXT4_EXT_GET_LEN(ex) > EXT4_EXT_MAX_LEN_WRITTEN)
+#define EXT4_EXT_SET_UNWRITTEN(ex) \
+ ((ex)->block_count |= to_le16(EXT4_EXT_UNWRITTEN_MASK))
+#define EXT4_EXT_SET_WRITTEN(ex) \
+ ((ex)->block_count &= ~(to_le16(EXT4_EXT_UNWRITTEN_MASK)))
+
+/*
+ * Array of ext4_ext_path contains path to some extent.
+ * Creation/lookup routines use it for traversal/splitting/etc.
+ * Truncate uses it to simulate recursive walking.
+ */
+struct ext4_extent_path {
+ ext4_fsblk_t p_block;
+ struct ext4_block block;
+ int32_t depth;
+ int32_t maxdepth;
+ struct ext4_extent_header *header;
+ struct ext4_extent_index *index;
+ struct ext4_extent *extent;
+};
+
+
+#pragma pack(push, 1)
+
+/*
+ * This is the extent tail on-disk structure.
+ * All other extent structures are 12 bytes long. It turns out that
+ * block_size % 12 >= 4 for at least all powers of 2 greater than 512, which
+ * covers all valid ext4 block sizes. Therefore, this tail structure can be
+ * crammed into the end of the block without having to rebalance the tree.
+ */
+struct ext4_extent_tail
+{
+ uint32_t et_checksum; /* crc32c(uuid+inum+extent_block) */
+};
+
+/*
+ * This is the extent on-disk structure.
+ * It's used at the bottom of the tree.
+ */
+struct ext4_extent {
+ uint32_t first_block; /* First logical block extent covers */
+ uint16_t block_count; /* Number of blocks covered by extent */
+ uint16_t start_hi; /* High 16 bits of physical block */
+ uint32_t start_lo; /* Low 32 bits of physical block */
+};
+
+/*
+ * This is index on-disk structure.
+ * It's used at all the levels except the bottom.
+ */
+struct ext4_extent_index {
+ uint32_t first_block; /* Index covers logical blocks from 'block' */
+
+ /**
+ * Pointer to the physical block of the next
+ * level. leaf or next index could be there
+ * high 16 bits of physical block
+ */
+ uint32_t leaf_lo;
+ uint16_t leaf_hi;
+ uint16_t padding;
+};
+
+/*
+ * Each block (leaves and indexes), even inode-stored has header.
+ */
+struct ext4_extent_header {
+ uint16_t magic;
+ uint16_t entries_count; /* Number of valid entries */
+ uint16_t max_entries_count; /* Capacity of store in entries */
+ uint16_t depth; /* Has tree real underlying blocks? */
+ uint32_t generation; /* generation of the tree */
+};
+
+#pragma pack(pop)
+
+
+#define EXT4_EXTENT_MAGIC 0xF30A
+
+#define EXT4_EXTENT_FIRST(header) \
+ ((struct ext4_extent *)(((char *)(header)) + \
+ sizeof(struct ext4_extent_header)))
+
+#define EXT4_EXTENT_FIRST_INDEX(header) \
+ ((struct ext4_extent_index *)(((char *)(header)) + \
+ sizeof(struct ext4_extent_header)))
+
+/*
+ * EXT_INIT_MAX_LEN is the maximum number of blocks we can have in an
+ * initialized extent. This is 2^15 and not (2^16 - 1), since we use the
+ * MSB of ee_len field in the extent datastructure to signify if this
+ * particular extent is an initialized extent or an uninitialized (i.e.
+ * preallocated).
+ * EXT_UNINIT_MAX_LEN is the maximum number of blocks we can have in an
+ * uninitialized extent.
+ * If ee_len is <= 0x8000, it is an initialized extent. Otherwise, it is an
+ * uninitialized one. In other words, if MSB of ee_len is set, it is an
+ * uninitialized extent with only one special scenario when ee_len = 0x8000.
+ * In this case we can not have an uninitialized extent of zero length and
+ * thus we make it as a special case of initialized extent with 0x8000 length.
+ * This way we get better extent-to-group alignment for initialized extents.
+ * Hence, the maximum number of blocks we can have in an *initialized*
+ * extent is 2^15 (32768) and in an *uninitialized* extent is 2^15-1 (32767).
+ */
+#define EXT_INIT_MAX_LEN (1L << 15)
+#define EXT_UNWRITTEN_MAX_LEN (EXT_INIT_MAX_LEN - 1)
+
+#define EXT_EXTENT_SIZE sizeof(struct ext4_extent)
+#define EXT_INDEX_SIZE sizeof(struct ext4_extent_idx)
+
+#define EXT_FIRST_EXTENT(__hdr__) \
+ ((struct ext4_extent *)(((char *)(__hdr__)) + \
+ sizeof(struct ext4_extent_header)))
+#define EXT_FIRST_INDEX(__hdr__) \
+ ((struct ext4_extent_index *)(((char *)(__hdr__)) + \
+ sizeof(struct ext4_extent_header)))
+#define EXT_HAS_FREE_INDEX(__path__) \
+ (to_le16((__path__)->header->entries_count) < \
+ to_le16((__path__)->header->max_entries_count))
+#define EXT_LAST_EXTENT(__hdr__) \
+ (EXT_FIRST_EXTENT((__hdr__)) + to_le16((__hdr__)->entries_count) - 1)
+#define EXT_LAST_INDEX(__hdr__) \
+ (EXT_FIRST_INDEX((__hdr__)) + to_le16((__hdr__)->entries_count) - 1)
+#define EXT_MAX_EXTENT(__hdr__) \
+ (EXT_FIRST_EXTENT((__hdr__)) + to_le16((__hdr__)->max_entries_count) - 1)
+#define EXT_MAX_INDEX(__hdr__) \
+ (EXT_FIRST_INDEX((__hdr__)) + to_le16((__hdr__)->max_entries_count) - 1)
+
+#define EXT4_EXTENT_TAIL_OFFSET(hdr) \
+ (sizeof(struct ext4_extent_header) + \
+ (sizeof(struct ext4_extent) * to_le16((hdr)->max_entries_count)))
+
+
+/**@brief Get logical number of the block covered by extent.
+ * @param extent Extent to load number from
+ * @return Logical number of the first block covered by extent */
+static inline uint32_t ext4_extent_get_first_block(struct ext4_extent *extent)
+{
+ return to_le32(extent->first_block);
+}
+
+/**@brief Set logical number of the first block covered by extent.
+ * @param extent Extent to set number to
+ * @param iblock Logical number of the first block covered by extent */
+static inline void ext4_extent_set_first_block(struct ext4_extent *extent,
+ uint32_t iblock)
+{
+ extent->first_block = to_le32(iblock);
+}
+
+/**@brief Get number of blocks covered by extent.
+ * @param extent Extent to load count from
+ * @return Number of blocks covered by extent */
+static inline uint16_t ext4_extent_get_block_count(struct ext4_extent *extent)
+{
+ if (EXT4_EXT_IS_UNWRITTEN(extent))
+ return EXT4_EXT_GET_LEN_UNWRITTEN(extent);
+ else
+ return EXT4_EXT_GET_LEN(extent);
+}
+/**@brief Set number of blocks covered by extent.
+ * @param extent Extent to load count from
+ * @param count Number of blocks covered by extent
+ * @param unwritten Whether the extent is unwritten or not */
+static inline void ext4_extent_set_block_count(struct ext4_extent *extent,
+ uint16_t count, bool unwritten)
+{
+ EXT4_EXT_SET_LEN(extent, count);
+ if (unwritten)
+ EXT4_EXT_SET_UNWRITTEN(extent);
+}
+
+/**@brief Get physical number of the first block covered by extent.
+ * @param extent Extent to load number
+ * @return Physical number of the first block covered by extent */
+static inline uint64_t ext4_extent_get_start(struct ext4_extent *extent)
+{
+ return ((uint64_t)to_le16(extent->start_hi)) << 32 |
+ ((uint64_t)to_le32(extent->start_lo));
+}
+
+
+/**@brief Set physical number of the first block covered by extent.
+ * @param extent Extent to load number
+ * @param fblock Physical number of the first block covered by extent */
+static inline void ext4_extent_set_start(struct ext4_extent *extent, uint64_t fblock)
+{
+ extent->start_lo = to_le32((fblock << 32) >> 32);
+ extent->start_hi = to_le16((uint16_t)(fblock >> 32));
+}
+
+
+/**@brief Get logical number of the block covered by extent index.
+ * @param index Extent index to load number from
+ * @return Logical number of the first block covered by extent index */
+static inline uint32_t
+ext4_extent_index_get_first_block(struct ext4_extent_index *index)
+{
+ return to_le32(index->first_block);
+}
+
+/**@brief Set logical number of the block covered by extent index.
+ * @param index Extent index to set number to
+ * @param iblock Logical number of the first block covered by extent index */
+static inline void
+ext4_extent_index_set_first_block(struct ext4_extent_index *index,
+ uint32_t iblock)
+{
+ index->first_block = to_le32(iblock);
+}
+
+/**@brief Get physical number of block where the child node is located.
+ * @param index Extent index to load number from
+ * @return Physical number of the block with child node */
+static inline uint64_t
+ext4_extent_index_get_leaf(struct ext4_extent_index *index)
+{
+ return ((uint64_t)to_le16(index->leaf_hi)) << 32 |
+ ((uint64_t)to_le32(index->leaf_lo));
+}
+
+/**@brief Set physical number of block where the child node is located.
+ * @param index Extent index to set number to
+ * @param fblock Ohysical number of the block with child node */
+static inline void ext4_extent_index_set_leaf(struct ext4_extent_index *index,
+ uint64_t fblock)
+{
+ index->leaf_lo = to_le32((fblock << 32) >> 32);
+ index->leaf_hi = to_le16((uint16_t)(fblock >> 32));
+}
+
+/**@brief Get magic value from extent header.
+ * @param header Extent header to load value from
+ * @return Magic value of extent header */
+static inline uint16_t
+ext4_extent_header_get_magic(struct ext4_extent_header *header)
+{
+ return to_le16(header->magic);
+}
+
+/**@brief Set magic value to extent header.
+ * @param header Extent header to set value to
+ * @param magic Magic value of extent header */
+static inline void ext4_extent_header_set_magic(struct ext4_extent_header *header,
+ uint16_t magic)
+{
+ header->magic = to_le16(magic);
+}
+
+/**@brief Get number of entries from extent header
+ * @param header Extent header to get value from
+ * @return Number of entries covered by extent header */
+static inline uint16_t
+ext4_extent_header_get_entries_count(struct ext4_extent_header *header)
+{
+ return to_le16(header->entries_count);
+}
+
+/**@brief Set number of entries to extent header
+ * @param header Extent header to set value to
+ * @param count Number of entries covered by extent header */
+static inline void
+ext4_extent_header_set_entries_count(struct ext4_extent_header *header,
+ uint16_t count)
+{
+ header->entries_count = to_le16(count);
+}
+
+/**@brief Get maximum number of entries from extent header
+ * @param header Extent header to get value from
+ * @return Maximum number of entries covered by extent header */
+static inline uint16_t
+ext4_extent_header_get_max_entries_count(struct ext4_extent_header *header)
+{
+ return to_le16(header->max_entries_count);
+}
+
+/**@brief Set maximum number of entries to extent header
+ * @param header Extent header to set value to
+ * @param max_count Maximum number of entries covered by extent header */
+static inline void
+ext4_extent_header_set_max_entries_count(struct ext4_extent_header *header,
+ uint16_t max_count)
+{
+ header->max_entries_count = to_le16(max_count);
+}
+
+/**@brief Get depth of extent subtree.
+ * @param header Extent header to get value from
+ * @return Depth of extent subtree */
+static inline uint16_t
+ext4_extent_header_get_depth(struct ext4_extent_header *header)
+{
+ return to_le16(header->depth);
+}
+
+/**@brief Set depth of extent subtree.
+ * @param header Extent header to set value to
+ * @param depth Depth of extent subtree */
+static inline void
+ext4_extent_header_set_depth(struct ext4_extent_header *header, uint16_t depth)
+{
+ header->depth = to_le16(depth);
+}
+
+/**@brief Get generation from extent header
+ * @param header Extent header to get value from
+ * @return Generation */
+static inline uint32_t
+ext4_extent_header_get_generation(struct ext4_extent_header *header)
+{
+ return to_le32(header->generation);
+}
+
+/**@brief Set generation to extent header
+ * @param header Extent header to set value to
+ * @param generation Generation */
+static inline void
+ext4_extent_header_set_generation(struct ext4_extent_header *header,
+ uint32_t generation)
+{
+ header->generation = to_le32(generation);
+}
+
+void ext4_extent_tree_init(struct ext4_inode_ref *inode_ref)
+{
+ /* Initialize extent root header */
+ struct ext4_extent_header *header =
+ ext4_inode_get_extent_header(inode_ref->inode);
+ ext4_extent_header_set_depth(header, 0);
+ ext4_extent_header_set_entries_count(header, 0);
+ ext4_extent_header_set_generation(header, 0);
+ ext4_extent_header_set_magic(header, EXT4_EXTENT_MAGIC);
+
+ uint16_t max_entries = (EXT4_INODE_BLOCKS * sizeof(uint32_t) -
+ sizeof(struct ext4_extent_header)) /
+ sizeof(struct ext4_extent);
+
+ ext4_extent_header_set_max_entries_count(header, max_entries);
+ inode_ref->dirty = true;
+}
+
+
static struct ext4_extent_tail *
find_ext4_extent_tail(struct ext4_extent_header *eh)
{
/*
- * Copyright (c) 2015 Grzegorz Kostka (kostka.grzegorz@gmail.com)
- * Copyright (c) 2015 Kaho Ng (ngkaho1234@gmail.com)
+ * Copyright (c) 2017 Grzegorz Kostka (kostka.grzegorz@gmail.com)
+ * Copyright (c) 2017 Kaho Ng (ngkaho1234@gmail.com)
*
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * - Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * - Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * - The name of the author may not be used to endorse or promote products
- * derived from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
- * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
- * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
- * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
*/
/** @addtogroup lwext4
* @brief Extended Attribute Manipulation
*/
+/* Extended Attribute(EA) */
+
+/* Magic value in attribute blocks */
+#define EXT4_XATTR_MAGIC 0xEA020000
+
+/* Maximum number of references to one attribute block */
+#define EXT4_XATTR_REFCOUNT_MAX 1024
+
+/* Name indexes */
+#define EXT4_XATTR_INDEX_USER 1
+#define EXT4_XATTR_INDEX_POSIX_ACL_ACCESS 2
+#define EXT4_XATTR_INDEX_POSIX_ACL_DEFAULT 3
+#define EXT4_XATTR_INDEX_TRUSTED 4
+#define EXT4_XATTR_INDEX_LUSTRE 5
+#define EXT4_XATTR_INDEX_SECURITY 6
+#define EXT4_XATTR_INDEX_SYSTEM 7
+#define EXT4_XATTR_INDEX_RICHACL 8
+#define EXT4_XATTR_INDEX_ENCRYPTION 9
+
+#define EXT4_XATTR_PAD_BITS 2
+#define EXT4_XATTR_PAD (1 << EXT4_XATTR_PAD_BITS)
+#define EXT4_XATTR_ROUND (EXT4_XATTR_PAD - 1)
+#define EXT4_XATTR_LEN(name_len) \
+ (((name_len) + EXT4_XATTR_ROUND + sizeof(struct ext4_xattr_entry)) & \
+ ~EXT4_XATTR_ROUND)
+#define EXT4_XATTR_NEXT(entry) \
+ ((struct ext4_xattr_entry *)((char *)(entry) + \
+ EXT4_XATTR_LEN((entry)->e_name_len)))
+#define EXT4_XATTR_SIZE(size) (((size) + EXT4_XATTR_ROUND) & ~EXT4_XATTR_ROUND)
+#define EXT4_XATTR_NAME(entry) ((char *)((entry) + 1))
+
+#define EXT4_XATTR_IHDR(sb, raw_inode) \
+ ((struct ext4_xattr_ibody_header *)((char *)raw_inode + \
+ EXT4_GOOD_OLD_INODE_SIZE + \
+ ext4_inode_get_extra_isize( \
+ sb, raw_inode)))
+#define EXT4_XATTR_IFIRST(hdr) ((struct ext4_xattr_entry *)((hdr) + 1))
+
+#define EXT4_XATTR_BHDR(block) ((struct ext4_xattr_header *)((block)->data))
+#define EXT4_XATTR_ENTRY(ptr) ((struct ext4_xattr_entry *)(ptr))
+#define EXT4_XATTR_BFIRST(block) EXT4_XATTR_ENTRY(EXT4_XATTR_BHDR(block) + 1)
+#define EXT4_XATTR_IS_LAST_ENTRY(entry) (*(uint32_t *)(entry) == 0)
+
+#define EXT4_ZERO_XATTR_VALUE ((void *)-1)
+
+#pragma pack(push, 1)
+
+struct ext4_xattr_header {
+ uint32_t h_magic; /* magic number for identification */
+ uint32_t h_refcount; /* reference count */
+ uint32_t h_blocks; /* number of disk blocks used */
+ uint32_t h_hash; /* hash value of all attributes */
+ uint32_t h_checksum; /* crc32c(uuid+id+xattrblock) */
+ /* id = inum if refcount=1, blknum otherwise */
+ uint32_t h_reserved[3]; /* zero right now */
+};
+
+struct ext4_xattr_ibody_header {
+ uint32_t h_magic; /* magic number for identification */
+};
+
+struct ext4_xattr_entry {
+ uint8_t e_name_len; /* length of name */
+ uint8_t e_name_index; /* attribute name index */
+ uint16_t e_value_offs; /* offset in disk block of value */
+ uint32_t e_value_block; /* disk block attribute is stored on (n/i) */
+ uint32_t e_value_size; /* size of attribute value */
+ uint32_t e_hash; /* hash value of name and value */
+};
+
+#pragma pack(pop)
+
+
#define NAME_HASH_SHIFT 5
#define VALUE_HASH_SHIFT 16
projects / lwext4.git / commitdiff