Theodore Ts'o 45df4b8977 ext4: fix nomblk_io_submit option so it correctly converts uninit blocks ...

commit 9dd75f1f1a upstream.

Bug discovered by Jan Kara:

Finally, commit 1449032be1 returned back
the old IO submission code but apparently it forgot to return the old
handling of uninitialized buffers so we unconditionnaly call
block_write_full_page() without specifying end_io function. So AFAICS
we never convert unwritten extents to written in some cases. For
example when I mount the fs as: mount -t ext4 -o
nomblk_io_submit,dioread_nolock /dev/ubdb /mnt and do
        int fd = open(argv[1], O_RDWR | O_CREAT | O_TRUNC, 0600);
        char buf[1024];
        memset(buf, 'a', sizeof(buf));
        fallocate(fd, 0, 0, 16384);
        write(fd, buf, sizeof(buf));

I get a file full of zeros (after remounting the filesystem so that
pagecache is dropped) instead of seeing the first KB contain 'a's.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

2011-08-29 13:29:11 -07:00

..

acl.c

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acl.h

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balloc.c

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bitmap.c

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block_validity.c

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dir.c

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ext4_extents.h

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ext4_jbd2.c

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ext4_jbd2.h

ext4: Fix ext4_should_writeback_data() for no-journal mode

2011-08-29 13:29:10 -07:00

ext4.h

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extents.c

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file.c

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fsync.c

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hash.c

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ialloc.c

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inode.c

ext4: fix nomblk_io_submit option so it correctly converts uninit blocks

2011-08-29 13:29:11 -07:00

ioctl.c

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Kconfig

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Makefile

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mballoc.c

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mballoc.h

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migrate.c

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mmp.c

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move_extent.c

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namei.c

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page-io.c

ext4: Resolve the hang of direct i/o read in handling EXT4_IO_END_UNWRITTEN.

2011-08-29 13:29:11 -07:00

resize.c

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super.c

ext4: call ext4_ioend_wait and ext4_flush_completed_IO in ext4_evict_inode

2011-08-29 13:29:10 -07:00

symlink.c

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xattr_security.c

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xattr_trusted.c

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xattr_user.c

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xattr.c

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xattr.h

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