udf: fix directory offset handling

Patch cleaning up UDF directory offset handling missed modifications in dir.c
(because I've submitted an old version :(). Fix it.

Signed-off-by: Jan Kara <jack@suse.cz>
Reported-by: Marcin Slusarz <marcin.slusarz@gmail.com>
Tested-by: Marcin Slusarz <marcin.slusarz@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/udf/dir.c b/fs/udf/dir.c
index 4b44e23..8d8643a 100644 (file)
--- a/fs/udf/dir.c
+++ b/fs/udf/dir.c
@@ -43,13 +43,13 @@ static int do_udf_readdir(struct inode *dir, struct file *filp,
        struct fileIdentDesc *fi = NULL;
        struct fileIdentDesc cfi;
        int block, iblock;
-       loff_t nf_pos = filp->f_pos - 1;
+       loff_t nf_pos = (filp->f_pos - 1) << 2;
        int flen;
        char fname[UDF_NAME_LEN];
        char *nameptr;
        uint16_t liu;
        uint8_t lfi;
-       loff_t size = (udf_ext0_offset(dir) + dir->i_size) >> 2;
+       loff_t size = udf_ext0_offset(dir) + dir->i_size;
        struct buffer_head *tmp, *bha[16];
        kernel_lb_addr eloc;
        uint32_t elen;
@@ -63,13 +63,13 @@ static int do_udf_readdir(struct inode *dir, struct file *filp,
                return 0;
 
        if (nf_pos == 0)
-               nf_pos = (udf_ext0_offset(dir) >> 2);
+               nf_pos = udf_ext0_offset(dir);
 
-       fibh.soffset = fibh.eoffset = (nf_pos & ((dir->i_sb->s_blocksize - 1) >> 2)) << 2;
+       fibh.soffset = fibh.eoffset = nf_pos & (dir->i_sb->s_blocksize - 1);
        iinfo = UDF_I(dir);
        if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
                fibh.sbh = fibh.ebh = NULL;
-       } else if (inode_bmap(dir, nf_pos >> (dir->i_sb->s_blocksize_bits - 2),
+       } else if (inode_bmap(dir, nf_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);
                if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
@@ -111,7 +111,7 @@ static int do_udf_readdir(struct inode *dir, struct file *filp,
        }
 
        while (nf_pos < size) {
-               filp->f_pos = nf_pos + 1;
+               filp->f_pos = (nf_pos >> 2) + 1;
 
                fi = udf_fileident_read(dir, &nf_pos, &fibh, &cfi, &epos, &eloc,
                                        &elen, &offset);
@@ -178,7 +178,7 @@ static int do_udf_readdir(struct inode *dir, struct file *filp,
                }
        } /* end while */
 
-       filp->f_pos = nf_pos + 1;
+       filp->f_pos = (nf_pos >> 2) + 1;
 
        if (fibh.sbh != fibh.ebh)
                brelse(fibh.ebh);