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ext4: optimize starting extent in ext4_ext_rm_leaf() 

Both hole punch and truncate use ext4_ext_rm_leaf() for removing
blocks.  Currently we choose the last extent as the starting
point for removing blocks:

	ex = EXT_LAST_EXTENT(eh);

This is OK for truncate but for hole punch we can optimize the extent
selection as the path is already initialized.  We could use this
information to select proper starting extent.  The code change in this
patch will not affect truncate as for truncate path[depth].p_ext will
always be NULL.

Signed-off-by: Ashish Sangwan <a.sangwan@samsung.com>
Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Ashish Sangwan 2013-07-01 08:12:41 -04:00 committed by Theodore Ts'o
parent 41a5b91319
commit 6ae06ff51e
1 changed files with 3 additions and 1 deletions
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4
fs/ext4/extents.c
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@ -2504,7 +2504,9 @@ ext4_ext_rm_leaf(handle_t *handle, struct inode *inode,
return -EIO;
}
/* find where to start removing */
ex = EXT_LAST_EXTENT(eh);
ex = path[depth].p_ext;
if (!ex)
ex = EXT_LAST_EXTENT(eh);
ex_ee_block = le32_to_cpu(ex->ee_block);
ex_ee_len = ext4_ext_get_actual_len(ex);