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SubjectRe: [Ext2-devel] [PATCH] concurrent block allocation for ext2 against 2.5.64
On Thu, Mar 13, 2003 at 09:43:05PM +0300, Alex Tomas wrote:
> fs/attr.c:
> if (ia_valid & ATTR_SIZE) {
> if (attr->ia_size == inode->i_size) {
> if (ia_valid == ATTR_SIZE)
> goto out; /* we can skip lock_kernel() */
> } else {
> lock_kernel();
> error = vmtruncate(inode, attr->ia_size);
> unlock_kernel();
> if (error)
> goto out;
> }
> }
> so, all (!) truncates are serialized

This looks like a bug. It should be safe to delete them. Rationale:

- Documentation/filesystems/Locking says ->truncate is called without the BKL.
- This isn't the only place vmtruncate() is called. Several of the callers
do it without the BKL (eg xfs, cifs).
- vmtruncate() appears to handle its own locking (mapping->i_shared_sem)


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