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Date: Sun, 12 Aug 2007 12:57:19 -0400
From: Theodore Ts'o <tytso@....edu>
To: jrs@...ibm.com
Cc: linux-ext4@...r.kernel.org, tytso@....edu
Subject: [PATCH] Clean up libext2fs by byte swapping iff WORDS_BIGENDIAN
We don't need byte swapping to be a run-time option; it can just be a
compile-time option instead.
Signed-off-by: "Theodore Ts'o" <tytso@....edu>
---
lib/ext2fs/bmap.c | 28 ++++++-----------
lib/ext2fs/closefs.c | 77 ++++++++++++++++++++---------------------------
lib/ext2fs/dirblock.c | 40 +++++++------------------
lib/ext2fs/ext_attr.c | 24 ++++++---------
lib/ext2fs/ind_block.c | 20 +++++-------
lib/ext2fs/inode.c | 52 +++++++++++++------------------
lib/ext2fs/openfs.c | 23 +++++++-------
7 files changed, 105 insertions(+), 159 deletions(-)
diff --git a/lib/ext2fs/bmap.c b/lib/ext2fs/bmap.c
index e840044..1dd562d 100644
--- a/lib/ext2fs/bmap.c
+++ b/lib/ext2fs/bmap.c
@@ -51,10 +51,8 @@ static _BMAP_INLINE_ errcode_t block_ind_bmap(ext2_filsys fs, int flags,
if (flags & BMAP_SET) {
b = *ret_blk;
-#ifdef EXT2FS_ENABLE_SWAPFS
- if ((fs->flags & EXT2_FLAG_SWAP_BYTES) ||
- (fs->flags & EXT2_FLAG_SWAP_BYTES_WRITE))
- b = ext2fs_swab32(b);
+#ifdef WORDS_BIGENDIAN
+ b = ext2fs_swab32(b);
#endif
((blk_t *) block_buf)[nr] = b;
return io_channel_write_blk(fs->io, ind, 1, block_buf);
@@ -62,10 +60,8 @@ static _BMAP_INLINE_ errcode_t block_ind_bmap(ext2_filsys fs, int flags,
b = ((blk_t *) block_buf)[nr];
-#ifdef EXT2FS_ENABLE_SWAPFS
- if ((fs->flags & EXT2_FLAG_SWAP_BYTES) ||
- (fs->flags & EXT2_FLAG_SWAP_BYTES_READ))
- b = ext2fs_swab32(b);
+#ifdef WORDS_BIGENDIAN
+ b = ext2fs_swab32(b);
#endif
if (!b && (flags & BMAP_ALLOC)) {
@@ -75,13 +71,11 @@ static _BMAP_INLINE_ errcode_t block_ind_bmap(ext2_filsys fs, int flags,
if (retval)
return retval;
-#ifdef EXT2FS_ENABLE_SWAPFS
- if ((fs->flags & EXT2_FLAG_SWAP_BYTES) ||
- (fs->flags & EXT2_FLAG_SWAP_BYTES_WRITE))
- ((blk_t *) block_buf)[nr] = ext2fs_swab32(b);
- else
+#ifdef WORDS_BIGENDIAN
+ ((blk_t *) block_buf)[nr] = ext2fs_swab32(b);
+#else
+ ((blk_t *) block_buf)[nr] = b;
#endif
- ((blk_t *) block_buf)[nr] = b;
retval = io_channel_write_blk(fs->io, ind, 1, block_buf);
if (retval)
@@ -167,10 +161,8 @@ errcode_t ext2fs_bmap(ext2_filsys fs, ext2_ino_t ino, struct ext2_inode *inode,
if (block < EXT2_NDIR_BLOCKS) {
if (bmap_flags & BMAP_SET) {
b = *phys_blk;
-#ifdef EXT2FS_ENABLE_SWAPFS
- if ((fs->flags & EXT2_FLAG_SWAP_BYTES) ||
- (fs->flags & EXT2_FLAG_SWAP_BYTES_READ))
- b = ext2fs_swab32(b);
+#ifdef WORDS_BIGENDIAN
+ b = ext2fs_swab32(b);
#endif
inode_bmap(inode, block) = b;
inode_dirty++;
diff --git a/lib/ext2fs/closefs.c b/lib/ext2fs/closefs.c
index 474e00e..c570256 100644
--- a/lib/ext2fs/closefs.c
+++ b/lib/ext2fs/closefs.c
@@ -191,12 +191,11 @@ static errcode_t write_backup_super(ext2_filsys fs, dgrp_t group,
if (sgrp > ((1 << 16) - 1))
sgrp = (1 << 16) - 1;
-#ifdef EXT2FS_ENABLE_SWAPFS
- if (fs->flags & EXT2_FLAG_SWAP_BYTES)
- super_shadow->s_block_group_nr = ext2fs_swab16(sgrp);
- else
+#ifdef WORDS_BIGENDIAN
+ super_shadow->s_block_group_nr = ext2fs_swab16(sgrp);
+#else
+ fs->super->s_block_group_nr = sgrp;
#endif
- fs->super->s_block_group_nr = sgrp;
return io_channel_write_blk(fs->io, group_block, -SUPERBLOCK_SIZE,
super_shadow);
@@ -220,29 +219,23 @@ errcode_t ext2fs_flush(ext2_filsys fs)
fs->super->s_wtime = fs->now ? fs->now : time(NULL);
fs->super->s_block_group_nr = 0;
-#ifdef EXT2FS_ENABLE_SWAPFS
- if (fs->flags & EXT2_FLAG_SWAP_BYTES) {
- retval = EXT2_ET_NO_MEMORY;
- retval = ext2fs_get_mem(SUPERBLOCK_SIZE, &super_shadow);
- if (retval)
- goto errout;
- retval = ext2fs_get_mem((size_t)(fs->blocksize *
- fs->desc_blocks),
- &group_shadow);
- if (retval)
- goto errout;
- memset(group_shadow, 0, (size_t) fs->blocksize *
- fs->desc_blocks);
-
- /* swap the group descriptors */
- for (j=0, s=fs->group_desc, t=group_shadow;
- j < fs->group_desc_count; j++, t++, s++) {
- *t = *s;
- ext2fs_swap_group_desc(t);
- }
- } else {
- super_shadow = fs->super;
- group_shadow = fs->group_desc;
+#ifdef WORDS_BIGENDIAN
+ retval = EXT2_ET_NO_MEMORY;
+ retval = ext2fs_get_mem(SUPERBLOCK_SIZE, &super_shadow);
+ if (retval)
+ goto errout;
+ retval = ext2fs_get_mem((size_t)(fs->blocksize * fs->desc_blocks),
+ &group_shadow);
+ if (retval)
+ goto errout;
+ memset(group_shadow, 0, (size_t) fs->blocksize *
+ fs->desc_blocks);
+
+ /* swap the group descriptors */
+ for (j=0, s=fs->group_desc, t=group_shadow;
+ j < fs->group_desc_count; j++, t++, s++) {
+ *t = *s;
+ ext2fs_swap_group_desc(t);
}
#else
super_shadow = fs->super;
@@ -255,11 +248,9 @@ errcode_t ext2fs_flush(ext2_filsys fs)
* we write out the backup superblocks.)
*/
fs->super->s_state &= ~EXT2_VALID_FS;
-#ifdef EXT2FS_ENABLE_SWAPFS
- if (fs->flags & EXT2_FLAG_SWAP_BYTES) {
- *super_shadow = *fs->super;
- ext2fs_swap_super(super_shadow);
- }
+#ifdef WORDS_BIGENDIAN
+ *super_shadow = *fs->super;
+ ext2fs_swap_super(super_shadow);
#endif
/*
@@ -333,11 +324,9 @@ write_primary_superblock_only:
fs->super->s_block_group_nr = 0;
fs->super->s_state = fs_state;
-#ifdef EXT2FS_ENABLE_SWAPFS
- if (fs->flags & EXT2_FLAG_SWAP_BYTES) {
- *super_shadow = *fs->super;
- ext2fs_swap_super(super_shadow);
- }
+#ifdef WORDS_BIGENDIAN
+ *super_shadow = *fs->super;
+ ext2fs_swap_super(super_shadow);
#endif
retval = io_channel_flush(fs->io);
@@ -350,12 +339,12 @@ write_primary_superblock_only:
retval = io_channel_flush(fs->io);
errout:
fs->super->s_state = fs_state;
- if (fs->flags & EXT2_FLAG_SWAP_BYTES) {
- if (super_shadow)
- ext2fs_free_mem(&super_shadow);
- if (group_shadow)
- ext2fs_free_mem(&group_shadow);
- }
+#ifdef WORDS_BIGENDIAN
+ if (super_shadow)
+ ext2fs_free_mem(&super_shadow);
+ if (group_shadow)
+ ext2fs_free_mem(&group_shadow);
+#endif
return retval;
}
diff --git a/lib/ext2fs/dirblock.c b/lib/ext2fs/dirblock.c
index ebfc72c..fb20fa0 100644
--- a/lib/ext2fs/dirblock.c
+++ b/lib/ext2fs/dirblock.c
@@ -25,26 +25,21 @@ errcode_t ext2fs_read_dir_block2(ext2_filsys fs, blk_t block,
errcode_t retval;
char *p, *end;
struct ext2_dir_entry *dirent;
- unsigned int name_len, rec_len, do_swap;
+ unsigned int name_len, rec_len;
retval = io_channel_read_blk(fs->io, block, 1, buf);
if (retval)
return retval;
-#ifdef EXT2FS_ENABLE_SWAPFS
- do_swap = (fs->flags & (EXT2_FLAG_SWAP_BYTES|
- EXT2_FLAG_SWAP_BYTES_READ)) != 0;
-#endif
+
p = (char *) buf;
end = (char *) buf + fs->blocksize;
while (p < end-8) {
dirent = (struct ext2_dir_entry *) p;
-#ifdef EXT2FS_ENABLE_SWAPFS
- if (do_swap) {
- dirent->inode = ext2fs_swab32(dirent->inode);
- dirent->rec_len = ext2fs_swab16(dirent->rec_len);
- dirent->name_len = ext2fs_swab16(dirent->name_len);
- }
+#ifdef WORDS_BIGENDIAN
+ dirent->inode = ext2fs_swab32(dirent->inode);
+ dirent->rec_len = ext2fs_swab16(dirent->rec_len);
+ dirent->name_len = ext2fs_swab16(dirent->name_len);
#endif
name_len = dirent->name_len;
#ifdef WORDS_BIGENDIAN
@@ -73,22 +68,12 @@ errcode_t ext2fs_read_dir_block(ext2_filsys fs, blk_t block,
errcode_t ext2fs_write_dir_block2(ext2_filsys fs, blk_t block,
void *inbuf, int flags EXT2FS_ATTR((unused)))
{
-#ifdef EXT2FS_ENABLE_SWAPFS
- int do_swap = 0;
+#ifdef WORDS_BIGENDIAN
errcode_t retval;
char *p, *end;
char *buf = 0;
struct ext2_dir_entry *dirent;
- if ((fs->flags & EXT2_FLAG_SWAP_BYTES) ||
- (fs->flags & EXT2_FLAG_SWAP_BYTES_WRITE))
- do_swap = 1;
-
-#ifndef WORDS_BIGENDIAN
- if (!do_swap)
- return io_channel_write_blk(fs->io, block, 1, (char *) inbuf);
-#endif
-
retval = ext2fs_get_mem(fs->blocksize, &buf);
if (retval)
return retval;
@@ -103,15 +88,12 @@ errcode_t ext2fs_write_dir_block2(ext2_filsys fs, blk_t block,
return (EXT2_ET_DIR_CORRUPTED);
}
p += dirent->rec_len;
- if (do_swap) {
- dirent->inode = ext2fs_swab32(dirent->inode);
- dirent->rec_len = ext2fs_swab16(dirent->rec_len);
- dirent->name_len = ext2fs_swab16(dirent->name_len);
- }
-#ifdef WORDS_BIGENDIAN
+ dirent->inode = ext2fs_swab32(dirent->inode);
+ dirent->rec_len = ext2fs_swab16(dirent->rec_len);
+ dirent->name_len = ext2fs_swab16(dirent->name_len);
+
if (flags & EXT2_DIRBLOCK_V2_STRUCT)
dirent->name_len = ext2fs_swab16(dirent->name_len);
-#endif
}
retval = io_channel_write_blk(fs->io, block, 1, buf);
ext2fs_free_mem(&buf);
diff --git a/lib/ext2fs/ext_attr.c b/lib/ext2fs/ext_attr.c
index 08211c3..ee5fe16 100644
--- a/lib/ext2fs/ext_attr.c
+++ b/lib/ext2fs/ext_attr.c
@@ -30,10 +30,8 @@ errcode_t ext2fs_read_ext_attr(ext2_filsys fs, blk_t block, void *buf)
retval = io_channel_read_blk(fs->io, block, 1, buf);
if (retval)
return retval;
-#ifdef EXT2FS_ENABLE_SWAPFS
- if ((fs->flags & (EXT2_FLAG_SWAP_BYTES|
- EXT2_FLAG_SWAP_BYTES_READ)) != 0)
- ext2fs_swap_ext_attr(buf, buf, fs->blocksize, 1);
+#ifdef WORDS_BIGENDIAN
+ ext2fs_swap_ext_attr(buf, buf, fs->blocksize, 1);
#endif
return 0;
}
@@ -44,17 +42,15 @@ errcode_t ext2fs_write_ext_attr(ext2_filsys fs, blk_t block, void *inbuf)
char *write_buf;
char *buf = NULL;
-#ifdef EXT2FS_ENABLE_SWAPFS
- if ((fs->flags & EXT2_FLAG_SWAP_BYTES) ||
- (fs->flags & EXT2_FLAG_SWAP_BYTES_WRITE)) {
- retval = ext2fs_get_mem(fs->blocksize, &buf);
- if (retval)
- return retval;
- write_buf = buf;
- ext2fs_swap_ext_attr(buf, inbuf, fs->blocksize, 1);
- } else
+#ifdef WORDS_BIGENDIAN
+ retval = ext2fs_get_mem(fs->blocksize, &buf);
+ if (retval)
+ return retval;
+ write_buf = buf;
+ ext2fs_swap_ext_attr(buf, inbuf, fs->blocksize, 1);
+#else
+ write_buf = (char *) inbuf;
#endif
- write_buf = (char *) inbuf;
retval = io_channel_write_blk(fs->io, block, 1, write_buf);
if (buf)
ext2fs_free_mem(&buf);
diff --git a/lib/ext2fs/ind_block.c b/lib/ext2fs/ind_block.c
index 3519048..9baa37f 100644
--- a/lib/ext2fs/ind_block.c
+++ b/lib/ext2fs/ind_block.c
@@ -34,12 +34,10 @@ errcode_t ext2fs_read_ind_block(ext2_filsys fs, blk_t blk, void *buf)
if (retval)
return retval;
}
-#ifdef EXT2FS_ENABLE_SWAPFS
- if (fs->flags & (EXT2_FLAG_SWAP_BYTES | EXT2_FLAG_SWAP_BYTES_READ)) {
- block_nr = (blk_t *) buf;
- for (i = 0; i < limit; i++, block_nr++)
- *block_nr = ext2fs_swab32(*block_nr);
- }
+#ifdef WORDS_BIGENDIAN
+ block_nr = (blk_t *) buf;
+ for (i = 0; i < limit; i++, block_nr++)
+ *block_nr = ext2fs_swab32(*block_nr);
#endif
return 0;
}
@@ -53,12 +51,10 @@ errcode_t ext2fs_write_ind_block(ext2_filsys fs, blk_t blk, void *buf)
if (fs->flags & EXT2_FLAG_IMAGE_FILE)
return 0;
-#ifdef EXT2FS_ENABLE_SWAPFS
- if (fs->flags & (EXT2_FLAG_SWAP_BYTES | EXT2_FLAG_SWAP_BYTES_WRITE)) {
- block_nr = (blk_t *) buf;
- for (i = 0; i < limit; i++, block_nr++)
- *block_nr = ext2fs_swab32(*block_nr);
- }
+#ifdef WORDS_BIGENDIAN
+ block_nr = (blk_t *) buf;
+ for (i = 0; i < limit; i++, block_nr++)
+ *block_nr = ext2fs_swab32(*block_nr);
#endif
return io_channel_write_blk(fs->io, blk, 1, buf);
}
diff --git a/lib/ext2fs/inode.c b/lib/ext2fs/inode.c
index 49d012c..6f24b61 100644
--- a/lib/ext2fs/inode.c
+++ b/lib/ext2fs/inode.c
@@ -453,32 +453,28 @@ errcode_t ext2fs_get_next_inode_full(ext2_inode_scan scan, ext2_ino_t *ino,
scan->ptr += scan->inode_size - extra_bytes;
scan->bytes_left -= scan->inode_size - extra_bytes;
-#ifdef EXT2FS_ENABLE_SWAPFS
+#ifdef WORDS_BIGENDIAN
memset(inode, 0, bufsize);
- if ((scan->fs->flags & EXT2_FLAG_SWAP_BYTES) ||
- (scan->fs->flags & EXT2_FLAG_SWAP_BYTES_READ))
- ext2fs_swap_inode_full(scan->fs,
- (struct ext2_inode_large *) inode,
- (struct ext2_inode_large *) scan->temp_buffer,
- 0, bufsize);
- else
+ ext2fs_swap_inode_full(scan->fs,
+ (struct ext2_inode_large *) inode,
+ (struct ext2_inode_large *) scan->temp_buffer,
+ 0, bufsize);
+#else
+ *inode = *((struct ext2_inode *) scan->temp_buffer);
#endif
- *inode = *((struct ext2_inode *) scan->temp_buffer);
if (scan->scan_flags & EXT2_SF_BAD_EXTRA_BYTES)
retval = EXT2_ET_BAD_BLOCK_IN_INODE_TABLE;
scan->scan_flags &= ~EXT2_SF_BAD_EXTRA_BYTES;
} else {
-#ifdef EXT2FS_ENABLE_SWAPFS
+#ifdef WORDS_BIGENDIAN
memset(inode, 0, bufsize);
- if ((scan->fs->flags & EXT2_FLAG_SWAP_BYTES) ||
- (scan->fs->flags & EXT2_FLAG_SWAP_BYTES_READ))
- ext2fs_swap_inode_full(scan->fs,
+ ext2fs_swap_inode_full(scan->fs,
(struct ext2_inode_large *) inode,
(struct ext2_inode_large *) scan->ptr,
0, bufsize);
- else
+#else
+ memcpy(inode, scan->ptr, bufsize);
#endif
- memcpy(inode, scan->ptr, bufsize);
scan->ptr += scan->inode_size;
scan->bytes_left -= scan->inode_size;
if (scan->scan_flags & EXT2_SF_BAD_INODE_BLK)
@@ -583,12 +579,10 @@ errcode_t ext2fs_read_inode_full(ext2_filsys fs, ext2_ino_t ino,
block_nr++;
}
-#ifdef EXT2FS_ENABLE_SWAPFS
- if ((fs->flags & EXT2_FLAG_SWAP_BYTES) ||
- (fs->flags & EXT2_FLAG_SWAP_BYTES_READ))
- ext2fs_swap_inode_full(fs, (struct ext2_inode_large *) inode,
- (struct ext2_inode_large *) inode,
- 0, bufsize);
+#ifdef WORDS_BIGENDIAN
+ ext2fs_swap_inode_full(fs, (struct ext2_inode_large *) inode,
+ (struct ext2_inode_large *) inode,
+ 0, bufsize);
#endif
/* Update the inode cache */
@@ -657,16 +651,14 @@ errcode_t ext2fs_write_inode_full(ext2_filsys fs, ext2_ino_t ino,
w_inode = &temp_inode;
memset(w_inode, 0, length);
-#ifdef EXT2FS_ENABLE_SWAPFS
- if ((fs->flags & EXT2_FLAG_SWAP_BYTES) ||
- (fs->flags & EXT2_FLAG_SWAP_BYTES_WRITE))
- ext2fs_swap_inode_full(fs, w_inode,
- (struct ext2_inode_large *) inode,
- 1, bufsize);
- else
+#ifdef WORDS_BIGENDIAN
+ ext2fs_swap_inode_full(fs, w_inode,
+ (struct ext2_inode_large *) inode,
+ 1, bufsize);
+#else
+ memcpy(w_inode, inode, bufsize);
#endif
- memcpy(w_inode, inode, bufsize);
-
+
group = (ino - 1) / EXT2_INODES_PER_GROUP(fs->super);
offset = ((ino - 1) % EXT2_INODES_PER_GROUP(fs->super)) *
EXT2_INODE_SIZE(fs->super);
diff --git a/lib/ext2fs/openfs.c b/lib/ext2fs/openfs.c
index 55cc077..f2790ad 100644
--- a/lib/ext2fs/openfs.c
+++ b/lib/ext2fs/openfs.c
@@ -178,12 +178,13 @@ errcode_t ext2fs_open2(const char *name, const char *io_options,
if (fs->orig_super)
memcpy(fs->orig_super, fs->super, SUPERBLOCK_SIZE);
-#ifdef EXT2FS_ENABLE_SWAPFS
- if ((fs->super->s_magic == ext2fs_swab16(EXT2_SUPER_MAGIC)) ||
- (fs->flags & EXT2_FLAG_SWAP_BYTES)) {
- fs->flags |= EXT2_FLAG_SWAP_BYTES;
-
- ext2fs_swap_super(fs->super);
+#ifdef WORDS_BIGENDIAN
+ fs->flags |= EXT2_FLAG_SWAP_BYTES;
+ ext2fs_swap_super(fs->super);
+#else
+ if (fs->flags & EXT2_FLAG_SWAP_BYTES) {
+ retval = EXT2_ET_UNIMPLEMENTED;
+ goto cleanup;
}
#endif
@@ -289,12 +290,10 @@ errcode_t ext2fs_open2(const char *name, const char *io_options,
retval = io_channel_read_blk(fs->io, blk, 1, dest);
if (retval)
goto cleanup;
-#ifdef EXT2FS_ENABLE_SWAPFS
- if (fs->flags & EXT2_FLAG_SWAP_BYTES) {
- gdp = (struct ext2_group_desc *) dest;
- for (j=0; j < groups_per_block; j++)
- ext2fs_swap_group_desc(gdp++);
- }
+#ifdef WORDS_BIGENDIAN
+ gdp = (struct ext2_group_desc *) dest;
+ for (j=0; j < groups_per_block; j++)
+ ext2fs_swap_group_desc(gdp++);
#endif
dest += fs->blocksize;
}
--
1.5.3.rc4.67.gf9286
-
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