tree e8323861b8dede0f3ddbfc8324d650bf1f4fd74b
parent 9f0ccfd8e07d61b413e6536ffa02fbf60d2e20d8
author Mingming Cao <cmm@us.ibm.com> 1254167348 -0400
committer Theodore Ts'o <tytso@mit.edu> 1254167348 -0400

ext4: Split uninitialized extents for direct I/O

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>