The NULL return of 'd_splice_alias' dosen't mean error. Thus the
successful case will also return NULL, which makes the tracepoint always
print 'err=-ENOENT'.
And the different cases of 'new' & 'err' are list as following:
1) dentry exists: err(0) with new(NULL) --> dentry, err=0
2) dentry exists: err(0) with new(VALID) --> new, err=0
3) dentry exists: err(0) with new(ERR) --> dentry, err=ERR
4) no dentry exists: err(-ENOENT) with new(NULL) --> dentry, err=-ENOENT
5) no dentry exists: err(-ENOENT) with new(VALID) --> new, err=-ENOENT
6) no dentry exists: err(-ENOENT) with new(ERR) --> dentry, err=ERR
Signed-off-by: Wu Bo <bo.wu@vivo.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
}
#endif
new = d_splice_alias(inode, dentry);
- err = PTR_ERR_OR_ZERO(new);
- trace_f2fs_lookup_end(dir, dentry, ino, !new ? -ENOENT : err);
+ trace_f2fs_lookup_end(dir, !IS_ERR_OR_NULL(new) ? new : dentry,
+ ino, IS_ERR(new) ? PTR_ERR(new) : err);
return new;
out_iput:
iput(inode);