udf: cleanup directory offset handling
Position in directory returned by readdir is offset of directory entry divided
by four (don't ask me why). Make this conversion only when reading f_pos from
userspace / writing it there and internally work in bytes. It makes things
more easily readable and also fixes a bug (we forgot to divide length of the
entry by 4 when advancing f_pos in udf_add_entry()).
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/fs/udf/directory.c b/fs/udf/directory.c
index be16d76..2820f8f 100644
--- a/fs/udf/directory.c
+++ b/fs/udf/directory.c
@@ -95,7 +95,7 @@
if (!fi)
return NULL;
- *nf_pos += ((fibh->eoffset - fibh->soffset) >> 2);
+ *nf_pos += fibh->eoffset - fibh->soffset;
memcpy((uint8_t *)cfi, (uint8_t *)fi,
sizeof(struct fileIdentDesc));
@@ -157,7 +157,7 @@
if (!fi)
return NULL;
- *nf_pos += ((fibh->eoffset - fibh->soffset) >> 2);
+ *nf_pos += fibh->eoffset - fibh->soffset;
if (fibh->eoffset <= dir->i_sb->s_blocksize) {
memcpy((uint8_t *)cfi, (uint8_t *)fi,
@@ -197,8 +197,7 @@
cfi->lengthFileIdent +
le16_to_cpu(cfi->lengthOfImpUse) + 3) & ~3;
- *nf_pos += (fi_len - (fibh->eoffset - fibh->soffset))
- >> 2;
+ *nf_pos += fi_len - (fibh->eoffset - fibh->soffset);
fibh->eoffset = fibh->soffset + fi_len;
} else {
memcpy((uint8_t *)cfi, (uint8_t *)fi,
diff --git a/fs/udf/inode.c b/fs/udf/inode.c
index 3483274..f792681 100644
--- a/fs/udf/inode.c
+++ b/fs/udf/inode.c
@@ -219,8 +219,8 @@
struct extent_position epos;
struct udf_fileident_bh sfibh, dfibh;
- loff_t f_pos = udf_ext0_offset(inode) >> 2;
- int size = (udf_ext0_offset(inode) + inode->i_size) >> 2;
+ loff_t f_pos = udf_ext0_offset(inode);
+ int size = udf_ext0_offset(inode) + inode->i_size;
struct fileIdentDesc cfi, *sfi, *dfi;
struct udf_inode_info *iinfo = UDF_I(inode);
@@ -256,11 +256,11 @@
mark_buffer_dirty_inode(dbh, inode);
sfibh.soffset = sfibh.eoffset =
- (f_pos & ((inode->i_sb->s_blocksize - 1) >> 2)) << 2;
+ f_pos & (inode->i_sb->s_blocksize - 1);
sfibh.sbh = sfibh.ebh = NULL;
dfibh.soffset = dfibh.eoffset = 0;
dfibh.sbh = dfibh.ebh = dbh;
- while ((f_pos < size)) {
+ while (f_pos < size) {
iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
sfi = udf_fileident_read(inode, &f_pos, &sfibh, &cfi, NULL,
NULL, NULL, NULL);
diff --git a/fs/udf/namei.c b/fs/udf/namei.c
index 4bf83d5..dacd8f4 100644
--- a/fs/udf/namei.c
+++ b/fs/udf/namei.c
@@ -160,14 +160,13 @@
struct extent_position epos = {};
struct udf_inode_info *dinfo = UDF_I(dir);
- size = (udf_ext0_offset(dir) + dir->i_size) >> 2;
- f_pos = (udf_ext0_offset(dir) >> 2);
+ size = udf_ext0_offset(dir) + dir->i_size;
+ f_pos = udf_ext0_offset(dir);
- fibh->soffset = fibh->eoffset =
- (f_pos & ((dir->i_sb->s_blocksize - 1) >> 2)) << 2;
+ fibh->soffset = fibh->eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
fibh->sbh = fibh->ebh = NULL;
- else if (inode_bmap(dir, f_pos >> (dir->i_sb->s_blocksize_bits - 2),
+ else if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits,
&epos, &eloc, &elen, &offset) ==
(EXT_RECORDED_ALLOCATED >> 30)) {
block = udf_get_lb_pblock(dir->i_sb, eloc, offset);
@@ -189,7 +188,7 @@
return NULL;
}
- while ((f_pos < size)) {
+ while (f_pos < size) {
fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
&elen, &offset);
if (!fi) {
@@ -342,7 +341,7 @@
loff_t f_pos;
int flen;
char *nameptr;
- loff_t size = (udf_ext0_offset(dir) + dir->i_size) >> 2;
+ loff_t size = udf_ext0_offset(dir) + dir->i_size;
int nfidlen;
uint8_t lfi;
uint16_t liu;
@@ -370,14 +369,13 @@
nfidlen = (sizeof(struct fileIdentDesc) + namelen + 3) & ~3;
- f_pos = (udf_ext0_offset(dir) >> 2);
+ f_pos = udf_ext0_offset(dir);
- fibh->soffset = fibh->eoffset =
- (f_pos & ((dir->i_sb->s_blocksize - 1) >> 2)) << 2;
+ fibh->soffset = fibh->eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
dinfo = UDF_I(dir);
if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
fibh->sbh = fibh->ebh = NULL;
- else if (inode_bmap(dir, f_pos >> (dir->i_sb->s_blocksize_bits - 2),
+ else if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits,
&epos, &eloc, &elen, &offset) ==
(EXT_RECORDED_ALLOCATED >> 30)) {
block = udf_get_lb_pblock(dir->i_sb, eloc, offset);
@@ -405,7 +403,7 @@
goto add;
}
- while ((f_pos < size)) {
+ while (f_pos < size) {
fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
&elen, &offset);
@@ -484,7 +482,7 @@
epos.bh = NULL;
fibh->soffset -= udf_ext0_offset(dir);
fibh->eoffset -= udf_ext0_offset(dir);
- f_pos -= (udf_ext0_offset(dir) >> 2);
+ f_pos -= udf_ext0_offset(dir);
if (fibh->sbh != fibh->ebh)
brelse(fibh->ebh);
brelse(fibh->sbh);
@@ -537,8 +535,7 @@
block = eloc.logicalBlockNum + ((elen - 1) >>
dir->i_sb->s_blocksize_bits);
fibh->ebh = udf_bread(dir,
- f_pos >> (dir->i_sb->s_blocksize_bits - 2),
- 1, err);
+ f_pos >> dir->i_sb->s_blocksize_bits, 1, err);
if (!fibh->ebh) {
brelse(epos.bh);
brelse(fibh->sbh);
@@ -775,7 +772,7 @@
struct fileIdentDesc *fi, cfi;
struct udf_fileident_bh fibh;
loff_t f_pos;
- loff_t size = (udf_ext0_offset(dir) + dir->i_size) >> 2;
+ loff_t size = udf_ext0_offset(dir) + dir->i_size;
int block;
kernel_lb_addr eloc;
uint32_t elen;
@@ -783,14 +780,12 @@
struct extent_position epos = {};
struct udf_inode_info *dinfo = UDF_I(dir);
- f_pos = (udf_ext0_offset(dir) >> 2);
-
- fibh.soffset = fibh.eoffset =
- (f_pos & ((dir->i_sb->s_blocksize - 1) >> 2)) << 2;
+ f_pos = udf_ext0_offset(dir);
+ fibh.soffset = fibh.eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
fibh.sbh = fibh.ebh = NULL;
- else if (inode_bmap(dir, f_pos >> (dir->i_sb->s_blocksize_bits - 2),
+ else if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits,
&epos, &eloc, &elen, &offset) ==
(EXT_RECORDED_ALLOCATED >> 30)) {
block = udf_get_lb_pblock(dir->i_sb, eloc, offset);
@@ -812,7 +807,7 @@
return 0;
}
- while ((f_pos < size)) {
+ while (f_pos < size) {
fi = udf_fileident_read(dir, &f_pos, &fibh, &cfi, &epos, &eloc,
&elen, &offset);
if (!fi) {