forge/linux-pinenote
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

ext4: Split uninitialized extents for direct I/O

Browse source 
When writing into an unitialized extent via direct I/O, and the direct
I/O doesn't exactly cover the unitialized extent, split the extent
into uninitialized and initialized extents before submitting the I/O.
This avoids needing to deal with an ENOSPC error in the end_io
callback that gets used for direct I/O.

When the IO is complete, the written extent will be marked as initialized.

Singed-Off-By: Mingming Cao <cmm@us.ibm.com> 
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Mingming Cao 2009-09-28 15:49:08 -04:00 • committed by Theodore Ts'o
parent 9f0ccfd8e0
commit 0031462b5b
6 changed files with 419 additions and 42 deletions
Download patch file Download diff file Expand all files Collapse all files

3
fs/ext4/inode.c
View file

@ -1233,6 +1233,9 @@ int ext4_get_blocks(handle_t *handle, struct inode *inode, sector_t block,
clear_buffer_mapped(bh);
clear_buffer_unwritten(bh);
ext_debug("ext4_get_blocks(): inode %lu, flag %d, max_blocks %u,"
"logical block %lu\n", inode->i_ino, flags, max_blocks,
(unsigned long)block);
/*
* Try to see if we can get the block without requesting a new
* file system block.