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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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1
fs/ext4/ext4.h
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@@ -2103,6 +2103,7 @@ extern ssize_t ext4_ind_direct_IO(int rw, struct kiocb *iocb,
extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock);
extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks, int chunk);
extern void ext4_ind_truncate(struct inode *inode);
extern int ext4_ind_punch_hole(struct file *file, loff_t offset, loff_t length);
/* ioctl.c */
extern long ext4_ioctl(struct file *, unsigned int, unsigned long);