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How to check in linux kernel at vfs layer whether the file object is for a directory or a file?
I have found that there is a function called is_dx(dir) which checks for this but it is present in namei.c in ext3 or ext4. I need to do this at vfs layer that is independent of the file system.
Having in hand the inode of the initial directory, the code
examines the entry matching the first name to get the
corresponding inode.
q Then the directory file having that node is read from disk and
the entry matching the second name is examined to derive the
corresponding inode.
q This procedure is repeated for each name included in the path.
The dentry cache considerably speeds up the procedure
File system operations are mostly done at the dcache level , so
they are all under kernel lock.