* Copyright (C) 1997 Theodore Ts'o.
*
* %Begin-Header%
- * This file may be redistributed under the terms of the GNU Public
- * License.
+ * 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>
#include <string.h>
#if HAVE_UNISTD_H
#endif
extern errcode_t ext2fs_bmap(ext2_filsys fs, ext2_ino_t ino,
- struct ext2_inode *inode,
+ struct ext2_inode *inode,
char *block_buf, int bmap_flags,
blk_t block, blk_t *phys_blk);
#define inode_bmap(inode, nr) ((inode)->i_block[(nr)])
-static _BMAP_INLINE_ errcode_t block_ind_bmap(ext2_filsys fs, int flags,
- blk_t ind, char *block_buf,
+static _BMAP_INLINE_ errcode_t block_ind_bmap(ext2_filsys fs, int flags,
+ blk_t ind, char *block_buf,
int *blocks_alloc,
blk_t nr, blk_t *ret_blk)
{
}
static _BMAP_INLINE_ errcode_t block_dind_bmap(ext2_filsys fs, int flags,
- blk_t dind, char *block_buf,
+ blk_t dind, char *block_buf,
int *blocks_alloc,
blk_t nr, blk_t *ret_blk)
{
- blk_t b;
+ blk_t b = 0;
errcode_t retval;
blk_t addr_per_block;
-
+
addr_per_block = (blk_t) fs->blocksize >> 2;
- retval = block_ind_bmap(fs, flags & ~BMAP_SET, dind, block_buf,
+ retval = block_ind_bmap(fs, flags & ~BMAP_SET, dind, block_buf,
blocks_alloc, nr / addr_per_block, &b);
if (retval)
return retval;
}
static _BMAP_INLINE_ errcode_t block_tind_bmap(ext2_filsys fs, int flags,
- blk_t tind, char *block_buf,
+ blk_t tind, char *block_buf,
int *blocks_alloc,
blk_t nr, blk_t *ret_blk)
{
- blk_t b;
+ blk_t b = 0;
errcode_t retval;
blk_t addr_per_block;
-
+
addr_per_block = (blk_t) fs->blocksize >> 2;
- retval = block_dind_bmap(fs, flags & ~BMAP_SET, tind, block_buf,
+ retval = block_dind_bmap(fs, flags & ~BMAP_SET, tind, block_buf,
blocks_alloc, nr / addr_per_block, &b);
if (retval)
return retval;
return retval;
}
+static errcode_t extent_bmap(ext2_filsys fs, ext2_ino_t ino,
+ struct ext2_inode *inode,
+ ext2_extent_handle_t handle,
+ char *block_buf, int bmap_flags, blk64_t block,
+ int *ret_flags, int *blocks_alloc,
+ blk64_t *phys_blk);
+
+static errcode_t implied_cluster_alloc(ext2_filsys fs, ext2_ino_t ino,
+ struct ext2_inode *inode,
+ ext2_extent_handle_t handle,
+ blk64_t lblk, blk64_t *phys_blk)
+{
+ blk64_t base_block, pblock = 0;
+ int i;
+
+ if (!EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
+ EXT4_FEATURE_RO_COMPAT_BIGALLOC))
+ return 0;
+
+ base_block = lblk & ~EXT2FS_CLUSTER_MASK(fs);
+ /*
+ * Except for the logical block (lblk) that was passed in, search all
+ * blocks in this logical cluster for a mapping to a physical cluster.
+ * If any such map exists, calculate the physical block that maps to
+ * the logical block and return that.
+ *
+ * The old code wouldn't even look if (block % cluster_ratio) == 0;
+ * this is incorrect if we're allocating blocks in reverse order.
+ */
+ for (i = 0; i < EXT2FS_CLUSTER_RATIO(fs); i++) {
+ if (base_block + i == lblk)
+ continue;
+ extent_bmap(fs, ino, inode, handle, 0, 0,
+ base_block + i, 0, 0, &pblock);
+ if (pblock)
+ break;
+ }
+ if (pblock == 0)
+ return 0;
+ *phys_blk = pblock - i + (lblk - base_block);
+ return 0;
+}
+
+/* Try to map a logical block to an already-allocated physical cluster. */
+errcode_t ext2fs_map_cluster_block(ext2_filsys fs, ext2_ino_t ino,
+ struct ext2_inode *inode, blk64_t lblk,
+ blk64_t *pblk)
+{
+ ext2_extent_handle_t handle;
+ errcode_t retval;
+
+ /* Need bigalloc and extents to be enabled */
+ *pblk = 0;
+ if (!EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
+ EXT4_FEATURE_RO_COMPAT_BIGALLOC) ||
+ !(inode->i_flags & EXT4_EXTENTS_FL))
+ return 0;
+
+ retval = ext2fs_extent_open2(fs, ino, inode, &handle);
+ if (retval)
+ goto out;
+
+ retval = implied_cluster_alloc(fs, ino, inode, handle, lblk, pblk);
+ if (retval)
+ goto out2;
+
+out2:
+ ext2fs_extent_free(handle);
+out:
+ return retval;
+}
+
+static errcode_t extent_bmap(ext2_filsys fs, ext2_ino_t ino,
+ struct ext2_inode *inode,
+ ext2_extent_handle_t handle,
+ char *block_buf, int bmap_flags, blk64_t block,
+ int *ret_flags, int *blocks_alloc,
+ blk64_t *phys_blk)
+{
+ struct ext2fs_extent extent;
+ unsigned int offset;
+ errcode_t retval = 0;
+ blk64_t blk64 = 0;
+ int alloc = 0;
+
+ if (bmap_flags & BMAP_SET) {
+ retval = ext2fs_extent_set_bmap(handle, block,
+ *phys_blk, 0);
+ return retval;
+ }
+ retval = ext2fs_extent_goto(handle, block);
+ if (retval) {
+ /* If the extent is not found, return phys_blk = 0 */
+ if (retval == EXT2_ET_EXTENT_NOT_FOUND)
+ goto got_block;
+ return retval;
+ }
+ retval = ext2fs_extent_get(handle, EXT2_EXTENT_CURRENT, &extent);
+ if (retval)
+ return retval;
+ offset = block - extent.e_lblk;
+ if (block >= extent.e_lblk && (offset <= extent.e_len)) {
+ *phys_blk = extent.e_pblk + offset;
+ if (ret_flags && extent.e_flags & EXT2_EXTENT_FLAGS_UNINIT)
+ *ret_flags |= BMAP_RET_UNINIT;
+ }
+got_block:
+ if ((*phys_blk == 0) && (bmap_flags & BMAP_ALLOC)) {
+ implied_cluster_alloc(fs, ino, inode, handle, block, &blk64);
+ if (blk64)
+ goto set_extent;
+ retval = extent_bmap(fs, ino, inode, handle, block_buf,
+ 0, block-1, 0, blocks_alloc, &blk64);
+ if (retval)
+ blk64 = 0;
+ retval = ext2fs_alloc_block2(fs, blk64, block_buf,
+ &blk64);
+ if (retval)
+ return retval;
+ blk64 &= ~EXT2FS_CLUSTER_MASK(fs);
+ blk64 += EXT2FS_CLUSTER_MASK(fs) & block;
+ alloc++;
+ set_extent:
+ retval = ext2fs_extent_set_bmap(handle, block,
+ blk64, 0);
+ if (retval)
+ return retval;
+ /* Update inode after setting extent */
+ retval = ext2fs_read_inode(fs, ino, inode);
+ if (retval)
+ return retval;
+ *blocks_alloc += alloc;
+ *phys_blk = blk64;
+ }
+ return 0;
+}
+
+int ext2fs_file_block_offset_too_big(ext2_filsys fs,
+ struct ext2_inode *inode,
+ blk64_t offset)
+{
+ blk64_t addr_per_block, max_map_block;
+
+ /* Kernel seems to cut us off at 4294967294 blocks */
+ if (offset >= (1ULL << 32) - 1)
+ return 1;
+
+ if (inode->i_flags & EXT4_EXTENTS_FL)
+ return 0;
+
+ addr_per_block = fs->blocksize >> 2;
+ max_map_block = addr_per_block;
+ max_map_block += addr_per_block * addr_per_block;
+ max_map_block += addr_per_block * addr_per_block * addr_per_block;
+ max_map_block += 12;
+
+ return offset >= max_map_block;
+}
+
errcode_t ext2fs_bmap2(ext2_filsys fs, ext2_ino_t ino, struct ext2_inode *inode,
char *block_buf, int bmap_flags, blk64_t block,
int *ret_flags, blk64_t *phys_blk)
}
addr_per_block = (blk_t) fs->blocksize >> 2;
- if (inode->i_flags & EXT4_EXTENTS_FL) {
- struct ext2fs_extent extent;
- unsigned int offset;
-
- if (bmap_flags & BMAP_SET) {
- retval = EXT2_ET_EXTENT_NOT_SUPPORTED;
- goto done;
- }
- retval = ext2fs_extent_open(fs, ino, &handle);
- if (retval)
- goto done;
- retval = ext2fs_extent_goto(handle, block);
- if (retval) {
- /* If the extent is not found, return phys_blk = 0 */
- if (retval == EXT2_ET_EXTENT_NOT_FOUND)
- retval = 0;
- goto done;
- }
- retval = ext2fs_extent_get(handle, EXT2_EXTENT_CURRENT, &extent);
- if (retval)
- goto done;
- offset = block - extent.e_lblk;
- if (block >= extent.e_lblk && (offset <= extent.e_len)) {
- *phys_blk = extent.e_pblk + offset;
- if (ret_flags && extent.e_flags & EXT2_EXTENT_FLAGS_UNINIT)
- *ret_flags |= BMAP_RET_UNINIT;
- }
- retval = 0;
- goto done;
- }
+ if (ext2fs_file_block_offset_too_big(fs, inode, block))
+ return EXT2_ET_FILE_TOO_BIG;
if (!block_buf) {
retval = ext2fs_get_array(2, fs->blocksize, &buf);
block_buf = buf;
}
+ if (inode->i_flags & EXT4_EXTENTS_FL) {
+ retval = ext2fs_extent_open2(fs, ino, inode, &handle);
+ if (retval)
+ goto done;
+ retval = extent_bmap(fs, ino, inode, handle, block_buf,
+ bmap_flags, block, ret_flags,
+ &blocks_alloc, phys_blk);
+ goto done;
+ }
+
if (block < EXT2_NDIR_BLOCKS) {
if (bmap_flags & BMAP_SET) {
b = *phys_blk;
-#ifdef WORDS_BIGENDIAN
- b = ext2fs_swab32(b);
-#endif
inode_bmap(inode, block) = b;
inode_dirty++;
goto done;
*phys_blk = inode_bmap(inode, block);
b = block ? inode_bmap(inode, block-1) : 0;
-
+
if ((*phys_blk == 0) && (bmap_flags & BMAP_ALLOC)) {
retval = ext2fs_alloc_block(fs, b, block_buf, &b);
if (retval)
}
goto done;
}
-
+
/* Indirect block */
block -= EXT2_NDIR_BLOCKS;
blk32 = *phys_blk;
inode_bmap(inode, EXT2_IND_BLOCK) = b;
blocks_alloc++;
}
- retval = block_ind_bmap(fs, bmap_flags, b, block_buf,
+ retval = block_ind_bmap(fs, bmap_flags, b, block_buf,
&blocks_alloc, block, &blk32);
if (retval == 0)
*phys_blk = blk32;
goto done;
}
-
+
/* Doubly indirect block */
block -= addr_per_block;
if (block < addr_per_block * addr_per_block) {
inode_bmap(inode, EXT2_DIND_BLOCK) = b;
blocks_alloc++;
}
- retval = block_dind_bmap(fs, bmap_flags, b, block_buf,
+ retval = block_dind_bmap(fs, bmap_flags, b, block_buf,
&blocks_alloc, block, &blk32);
if (retval == 0)
*phys_blk = blk32;
inode_bmap(inode, EXT2_TIND_BLOCK) = b;
blocks_alloc++;
}
- retval = block_tind_bmap(fs, bmap_flags, b, block_buf,
+ retval = block_tind_bmap(fs, bmap_flags, b, block_buf,
&blocks_alloc, block, &blk32);
if (retval == 0)
*phys_blk = blk32;
blk_t *phys_blk)
{
errcode_t ret;
- blk64_t ret_blk;
+ blk64_t ret_blk = *phys_blk;
ret = ext2fs_bmap2(fs, ino, inode, block_buf, bmap_flags, block,
0, &ret_blk);
projects / thirdparty / e2fsprogs.git / blobdiff