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[PATCH] ext4: retry failed direct IO allocations 

On a 256M filesystem, doing this in a loop:

        xfs_io -F -f -d -c 'pwrite 0 64m' test
        rm -f test

eventually leads to ENOSPC.  (the xfs_io command does a
64m direct IO write to the file "test")

As with other block allocation callers, it looks like we need to
potentially retry the allocations on the initial ENOSPC.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Eric Sandeen 2009-10-02 21:20:55 -04:00 committed by Theodore Ts'o
parent 74072d0a63
commit fbbf694566
1 changed files with 4 additions and 0 deletions
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4
fs/ext4/inode.c
View File

@ -3378,6 +3378,7 @@ static ssize_t ext4_ind_direct_IO(int rw, struct kiocb *iocb,
ssize_t ret;
int orphan = 0;
size_t count = iov_length(iov, nr_segs);
int retries = 0;
if (rw == WRITE) {
loff_t final_size = offset + count;
@ -3400,9 +3401,12 @@ static ssize_t ext4_ind_direct_IO(int rw, struct kiocb *iocb,
}
}
retry:
ret = blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
offset, nr_segs,
ext4_get_block, NULL);
if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
goto retry;
if (orphan) {
int err;