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ext4: Split uninitialized extents for direct I/O

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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
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2
fs/ext4/migrate.c
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@ -75,7 +75,7 @@ static int finish_range(handle_t *handle, struct inode *inode,
goto err_out;
}
}
retval = ext4_ext_insert_extent(handle, inode, path, &newext);
retval = ext4_ext_insert_extent(handle, inode, path, &newext, 0);
err_out:
if (path) {
ext4_ext_drop_refs(path);