| From | Greg Kroah-Hartman <> | Subject | [ 118/221] udf: dont increment lenExtents while writing to a hole | Date | Tue, 15 Jan 2013 10:50:45 -0800 |
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3.7-stable review patch. If anyone has any objections, please let me know.
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From: Namjae Jeon <namjae.jeon@samsung.com>
commit fb719c59bdb4fca86ee1fd1f42ab3735ca12b6b2 upstream.
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> Signed-off-by: Shuah Khan <shuah.khan@hp.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- fs/udf/inode.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-)
--- a/fs/udf/inode.c +++ b/fs/udf/inode.c @@ -601,6 +601,7 @@ static sector_t inode_getblk(struct inod 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 inod /* 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 inod 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 inod *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
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