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d_delete(): get rid of trylock loop 

just grab ->i_lock first; we have a positive dentry, nothing's going
to happen to inode

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2018-02-23 21:02:31 -05:00
parent c1d0c1a2b5
commit c19457f0ae
1 changed files with 9 additions and 19 deletions
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28
fs/dcache.c
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@ -2377,32 +2377,22 @@ EXPORT_SYMBOL(d_hash_and_lookup);
void d_delete(struct dentry * dentry) void d_delete(struct dentry * dentry)
{ {
struct inode *inode; struct inode *inode = dentry->d_inode;
int isdir = 0; int isdir = d_is_dir(dentry);
spin_lock(&inode->i_lock);
spin_lock(&dentry->d_lock);
/* /*
* Are we the only user? * Are we the only user?
*/ */
again:
spin_lock(&dentry->d_lock);
inode = dentry->d_inode;
isdir = S_ISDIR(inode->i_mode);
if (dentry->d_lockref.count == 1) { if (dentry->d_lockref.count == 1) {
if (!spin_trylock(&inode->i_lock)) {
spin_unlock(&dentry->d_lock);
cpu_relax();
goto again;
}
dentry->d_flags &= ~DCACHE_CANT_MOUNT; dentry->d_flags &= ~DCACHE_CANT_MOUNT;
dentry_unlink_inode(dentry); dentry_unlink_inode(dentry);
fsnotify_nameremove(dentry, isdir); } else {
return;
}
if (!d_unhashed(dentry))
__d_drop(dentry); __d_drop(dentry);
spin_unlock(&dentry->d_lock);
spin_unlock(&dentry->d_lock); spin_unlock(&inode->i_lock);
}
fsnotify_nameremove(dentry, isdir); fsnotify_nameremove(dentry, isdir);
} }
EXPORT_SYMBOL(d_delete); EXPORT_SYMBOL(d_delete);