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ext4: add punching hole support for non-extent-mapped files

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This patch add supports for indirect file support punching hole.  It
is almost the same as ext4_ext_punch_hole.  First, we invalidate all
pages between this hole, and then we try to deallocate all blocks of
this hole.

A recursive function is used to handle deallocation of blocks.  In
this function, it iterates over the entries in inode's i_blocks or
indirect blocks, and try to free the block for each one of them.

After applying this patch, xfstest #255 will not pass w/o extent because
indirect-based file doesn't support unwritten extents.

Signed-off-by: Zheng Liu <wenqing.lz@taobao.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Zheng Liu
2013-01-28 09:21:37 -05:00
committed by Theodore Ts'o
parent 03dafb5f59
commit 8bad6fc813
4 changed files with 250 additions and 11 deletions
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6
fs/ext4/inode.c
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@@ -3557,10 +3557,8 @@ int ext4_punch_hole(struct file *file, loff_t offset, loff_t length)
if (!S_ISREG(inode->i_mode))
return -EOPNOTSUPP;
if (!ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)) {
/* TODO: Add support for non extent hole punching */
return -EOPNOTSUPP;
}
if (!ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))
return ext4_ind_punch_hole(file, offset, length);
if (EXT4_SB(inode->i_sb)->s_cluster_ratio > 1) {
/* TODO: Add support for bigalloc file systems */