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vfs: make it possible to access the dentry hash/len as one 64-bit entry

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This allows comparing hash and len in one operation on 64-bit
architectures.  Right now only __d_lookup_rcu() takes advantage of this,
since that is the case we care most about.

The use of anonymous struct/unions hides the alternate 64-bit approach
from most users, the exception being a few cases where we initialize a
'struct qstr' with a static initializer.  This makes the problematic
cases use a new QSTR_INIT() helper function for that (but initializing
just the name pointer with a "{ .name = xyzzy }" initializer remains
valid, as does just copying another qstr structure).

Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Linus Torvalds 2012-05-10 13:14:12 -07:00
commit 26fe575028
18 changed files with 44 additions and 48 deletions
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5
fs/ufs/super.c
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@ -146,10 +146,7 @@ static struct dentry *ufs_fh_to_parent(struct super_block *sb, struct fid *fid,
static struct dentry *ufs_get_parent(struct dentry *child)
{
struct qstr dot_dot = {
.name = "..",
.len = 2,
};
struct qstr dot_dot = QSTR_INIT("..", 2);
ino_t ino;
ino = ufs_inode_by_name(child->d_inode, &dot_dot);