udf: don't increment lenExtents while writing to a hole

Incrementing lenExtents even while writing to a hole is bad
for performance as calls to udf_discard_prealloc and
udf_truncate_tail_extent would not return from start if
isize != lenExtents

Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>
Signed-off-by: Ashish Sangwan <a.sangwan@samsung.com>
Signed-off-by: Jan Kara <jack@suse.cz>

1 files changed, 5 insertions, 2 deletions

diff --git a/fs/udf/inode.c b/fs/udf/inode.c
index 2b7759371ff6..8266f2ed7fc4 100644
--- a/fs/udf/inode.c
+++ b/fs/udf/inode.c
@@ -601,6 +601,7 @@ static sector_t inode_getblk(struct inode *inode, sector_t block,
         struct udf_inode_info *iinfo = UDF_I(inode);
         int goal = 0, pgoal = iinfo->i_location.logicalBlockNum;
         int lastblock = 0;
+        bool isBeyondEOF;
 
         *err = 0;
         *new = 0;
@@ -680,7 +681,7 @@ static sector_t inode_getblk(struct inode *inode, sector_t block,
         /* Are we beyond EOF? */
         if (etype == -1) {
                 int ret;
-
+                isBeyondEOF = 1;
                 if (count) {
                         if (c)
                                 laarr[0] = laarr[1];
@@ -723,6 +724,7 @@ static sector_t inode_getblk(struct inode *inode, sector_t block,
                 endnum = c + 1;
                 lastblock = 1;
         } else {
+                isBeyondEOF = 0;
                 endnum = startnum = ((count > 2) ? 2 : count);
 
                 /* if the current extent is in position 0,
@@ -770,7 +772,8 @@ static sector_t inode_getblk(struct inode *inode, sector_t block,
                         *err = -ENOSPC;
                         return 0;
                 }
-                iinfo->i_lenExtents += inode->i_sb->s_blocksize;
+                if (isBeyondEOF)
+                        iinfo->i_lenExtents += inode->i_sb->s_blocksize;
         }
 
         /* if the extent the requsted block is located in contains multiple