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Fix btrfs_wait_ordered_extent_range to properly wait

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Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2008-07-18 20:42:20 -04:00
parent 7f3c74fb83
commit e5a2217ef6
3 changed files with 48 additions and 24 deletions
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43
fs/btrfs/ordered-data.c
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@ -324,22 +324,37 @@ void btrfs_start_ordered_extent(struct inode *inode,
void btrfs_wait_ordered_range(struct inode *inode, u64 start, u64 len)
{
u64 end;
u64 orig_end;
u64 wait_end;
struct btrfs_ordered_extent *ordered;
int found;
int should_wait = 0;
u64 mask = BTRFS_I(inode)->root->sectorsize - 1;
if (start + len < start) {
wait_end = (inode->i_size + mask) & ~mask;
orig_end = (u64)-1;
} else {
orig_end = start + len - 1;
wait_end = orig_end;
}
/* start IO across the range first to instantiate any delalloc
* extents
*/
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,22)
do_sync_file_range(file, start, wait_end, SYNC_FILE_RANGE_WRITE);
#else
do_sync_mapping_range(inode->i_mapping, start, wait_end,
SYNC_FILE_RANGE_WRITE);
#endif
end = orig_end;
wait_on_extent_writeback(&BTRFS_I(inode)->io_tree, start, orig_end);
again:
if (start + len < start)
end = (u64)-1;
else
end = start + len - 1;
found = 0;
while(1) {
ordered = btrfs_lookup_first_ordered_extent(inode, end);
if (!ordered) {
break;
}
if (ordered->file_offset >= start + len) {
if (ordered->file_offset > orig_end) {
btrfs_put_ordered_extent(ordered);
break;
}
@ -347,21 +362,15 @@ again:
btrfs_put_ordered_extent(ordered);
break;
}
btrfs_start_ordered_extent(inode, ordered, should_wait);
found++;
btrfs_start_ordered_extent(inode, ordered, 1);
end = ordered->file_offset;
btrfs_put_ordered_extent(ordered);
if (end == 0)
if (end == 0 || end == start)
break;
end--;
}
if (should_wait && found) {
should_wait = 0;
goto again;
}
}
/*
* find an ordered extent corresponding to file_offset. return NULL if
* nothing is found, otherwise take a reference on the extent and return it