Christoph,
nice work, and a pretty diffstat.
I see that get_acl and set_acl are being defined in some but not all symlink inode operations (for example, btrfs them while ext4 does not), and that posix_acl_xattr_set() doesn't check if set_acl is defined. Symlinks cannot have ACLs, so set_acl should either never be defined for symlinks (and a NULL check is then needed in posix_acl_xattr_set()), or it is defined in all inode operations, and S_ISNLNK() check is needed in posix_acl_xattr_set(). That latter check should probably be added in any case to be on the safe side.
Test case:
setfattr -h -n system.posix_acl_access \
-v 0sAgAAAAEABgD/////AgAGABMEAAAEAAYA/////xAABgD/////IAAEAP////8= \
symlink
Patch 6 also declares posix_acl_prepare() but this function is never introduced; this must be a leftover from a previous version.
Thanks,
Andreas
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