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>

diff --git a/fs/udf/inode.c b/fs/udf/inode.c
index 2b77593..8266f2e 100644 (file)
--- 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