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udf: cleanup directory offset handling

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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>
This commit is contained in:
Jan Kara
2008-02-08 04:20:50 -08:00
committed by Linus Torvalds
parent 32a8f24dd7
commit af793295bf
3 changed files with 24 additions and 30 deletions
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7
fs/udf/directory.c
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@@ -95,7 +95,7 @@ struct fileIdentDesc *udf_fileident_read(struct inode *dir, loff_t *nf_pos,
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 @@ struct fileIdentDesc *udf_fileident_read(struct inode *dir, loff_t *nf_pos,
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 @@ struct fileIdentDesc *udf_fileident_read(struct inode *dir, loff_t *nf_pos,
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,