udf: Provide function for calculating dir entry length

Provide function for calculating directory entry length and use to
reduce code duplication.

Signed-off-by: Jan Kara <jack@suse.cz>

3 files changed, 10 insertions, 15 deletions

diff --git a/fs/udf/directory.c b/fs/udf/directory.c
index 3835f983cc99..d9523013096f 100644
--- a/fs/udf/directory.c
+++ b/fs/udf/directory.c
@@ -141,10 +141,7 @@ struct fileIdentDesc *udf_fileident_read(struct inode *dir, loff_t *nf_pos,
                                fibh->ebh->b_data,
                                sizeof(struct fileIdentDesc) + fibh->soffset);
 
-                        fi_len = (sizeof(struct fileIdentDesc) +
-                                  cfi->lengthFileIdent +
-                                  le16_to_cpu(cfi->lengthOfImpUse) + 3) & ~3;
-
+                        fi_len = udf_dir_entry_len(cfi);
                         *nf_pos += fi_len - (fibh->eoffset - fibh->soffset);
                         fibh->eoffset = fibh->soffset + fi_len;
                 } else {
diff --git a/fs/udf/namei.c b/fs/udf/namei.c
index c586026508db..06f37ddd2997 100644
--- a/fs/udf/namei.c
+++ b/fs/udf/namei.c
@@ -351,8 +351,6 @@ static struct fileIdentDesc *udf_add_entry(struct inode *dir,
         loff_t f_pos;
         loff_t size = udf_ext0_offset(dir) + dir->i_size;
         int nfidlen;
-        uint8_t lfi;
-        uint16_t liu;
         udf_pblk_t block;
         struct kernel_lb_addr eloc;
         uint32_t elen = 0;
@@ -383,7 +381,7 @@ static struct fileIdentDesc *udf_add_entry(struct inode *dir,
                 namelen = 0;
         }
 
-        nfidlen = (sizeof(struct fileIdentDesc) + namelen + 3) & ~3;
+        nfidlen = ALIGN(sizeof(struct fileIdentDesc) + namelen, UDF_NAME_PAD);
 
         f_pos = udf_ext0_offset(dir);
 
@@ -424,12 +422,8 @@ static struct fileIdentDesc *udf_add_entry(struct inode *dir,
                         goto out_err;
                 }
 
-                liu = le16_to_cpu(cfi->lengthOfImpUse);
-                lfi = cfi->lengthFileIdent;
-
                 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
-                        if (((sizeof(struct fileIdentDesc) +
-                                        liu + lfi + 3) & ~3) == nfidlen) {
+                        if (udf_dir_entry_len(cfi) == nfidlen) {
                                 cfi->descTag.tagSerialNum = cpu_to_le16(1);
                                 cfi->fileVersionNum = cpu_to_le16(1);
                                 cfi->fileCharacteristics = 0;
@@ -1201,9 +1195,7 @@ static int udf_rename(struct inode *old_dir, struct dentry *old_dentry,
 
         if (dir_fi) {
                 dir_fi->icb.extLocation = cpu_to_lelb(UDF_I(new_dir)->i_location);
-                udf_update_tag((char *)dir_fi,
-                                (sizeof(struct fileIdentDesc) +
-                                le16_to_cpu(dir_fi->lengthOfImpUse) + 3) & ~3);
+                udf_update_tag((char *)dir_fi, udf_dir_entry_len(dir_fi));
                 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
                         mark_inode_dirty(old_inode);
                 else
diff --git a/fs/udf/udfdecl.h b/fs/udf/udfdecl.h
index bae311b59400..ed890bc4416d 100644
--- a/fs/udf/udfdecl.h
+++ b/fs/udf/udfdecl.h
@@ -132,6 +132,12 @@ struct inode *udf_find_metadata_inode_efe(struct super_block *sb,
 extern int udf_write_fi(struct inode *inode, struct fileIdentDesc *,
                         struct fileIdentDesc *, struct udf_fileident_bh *,
                         uint8_t *, uint8_t *);
+static inline unsigned int udf_dir_entry_len(struct fileIdentDesc *cfi)
+{
+        return ALIGN(sizeof(struct fileIdentDesc) +
+                le16_to_cpu(cfi->lengthOfImpUse) + cfi->lengthFileIdent,
+                UDF_NAME_PAD);
+}
 
 /* file.c */
 extern long udf_ioctl(struct file *, unsigned int, unsigned long);