Commit d3a84a8d authored by Max Staudt's avatar Max Staudt Committed by David Sterba
Browse files

affs: fix basic permission bits to actually work 



The basic permission bits (protection bits in AmigaOS) have been broken
in Linux' AFFS - it would only set bits, but never delete them.
Also, contrary to the documentation, the Archived bit was not handled.

Let's fix this for good, and set the bits such that Linux and classic
AmigaOS can coexist in the most peaceful manner.

Also, update the documentation to represent the current state of things.

Fixes: 1da177e4 ("Linux-2.6.12-rc2")
Cc: stable@vger.kernel.org
Signed-off-by: default avatarMax Staudt <max@enpas.org>
Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
parent f75aef39

Documentation/filesystems/affs.rst

+10 −6
Original line number Diff line number Diff line
@@ -110,13 +110,15 @@ The Amiga protection flags RWEDRWEDHSPARWED are handled as follows: 


  - R maps to r for user, group and others. On directories, R implies x.



  - If both W and D are allowed, w will be set.

  - W maps to w.



  - E maps to x.



  - H and P are always retained and ignored under Linux.

  - D is ignored.



  - A is always reset when a file is written to.

  - H, S and P are always retained and ignored under Linux.



  - A is cleared when a file is written to.



User id and group id will be used unless set[gu]id are given as mount

options. Since most of the Amiga file systems are single user systems
@@ -128,11 +130,13 @@ Linux -> Amiga: 


The Linux rwxrwxrwx file mode is handled as follows:



  - r permission will set R for user, group and others.

  - r permission will allow R for user, group and others.



  - w permission will allow W for user, group and others.



  - w permission will set W and D for user, group and others.

  - x permission of the user will allow E for plain files.



  - x permission of the user will set E for plain files.

  - D will be allowed for user, group and others.



  - All other flags (suid, sgid, ...) are ignored and will

    not be retained.

fs/affs/amigaffs.c

+27 −0
Original line number Diff line number Diff line
@@ -420,24 +420,51 @@ affs_mode_to_prot(struct inode *inode) 
	u32 prot = AFFS_I(inode)->i_protect;

	umode_t mode = inode->i_mode;



	/*

	 * First, clear all RWED bits for owner, group, other.

	 * Then, recalculate them afresh.

	 *

	 * We'll always clear the delete-inhibit bit for the owner, as that is

	 * the classic single-user mode AmigaOS protection bit and we need to

	 * stay compatible with all scenarios.

	 *

	 * Since multi-user AmigaOS is an extension, we'll only set the

	 * delete-allow bit if any of the other bits in the same user class

	 * (group/other) are used.

	 */

	prot &= ~(FIBF_NOEXECUTE | FIBF_NOREAD

		  | FIBF_NOWRITE | FIBF_NODELETE

		  | FIBF_GRP_EXECUTE | FIBF_GRP_READ

		  | FIBF_GRP_WRITE   | FIBF_GRP_DELETE

		  | FIBF_OTR_EXECUTE | FIBF_OTR_READ

		  | FIBF_OTR_WRITE   | FIBF_OTR_DELETE);



	/* Classic single-user AmigaOS flags. These are inverted. */

	if (!(mode & 0100))

		prot |= FIBF_NOEXECUTE;

	if (!(mode & 0400))

		prot |= FIBF_NOREAD;

	if (!(mode & 0200))

		prot |= FIBF_NOWRITE;



	/* Multi-user extended flags. Not inverted. */

	if (mode & 0010)

		prot |= FIBF_GRP_EXECUTE;

	if (mode & 0040)

		prot |= FIBF_GRP_READ;

	if (mode & 0020)

		prot |= FIBF_GRP_WRITE;

	if (mode & 0070)

		prot |= FIBF_GRP_DELETE;



	if (mode & 0001)

		prot |= FIBF_OTR_EXECUTE;

	if (mode & 0004)

		prot |= FIBF_OTR_READ;

	if (mode & 0002)

		prot |= FIBF_OTR_WRITE;

	if (mode & 0007)

		prot |= FIBF_OTR_DELETE;



	AFFS_I(inode)->i_protect = prot;

}

fs/affs/file.c

+25 −1
Original line number Diff line number Diff line
@@ -429,6 +429,24 @@ static int affs_write_begin(struct file *file, struct address_space *mapping, 
	return ret;

}



static int affs_write_end(struct file *file, struct address_space *mapping,

			  loff_t pos, unsigned int len, unsigned int copied,

			  struct page *page, void *fsdata)

{

	struct inode *inode = mapping->host;

	int ret;



	ret = generic_write_end(file, mapping, pos, len, copied, page, fsdata);



	/* Clear Archived bit on file writes, as AmigaOS would do */

	if (AFFS_I(inode)->i_protect & FIBF_ARCHIVED) {

		AFFS_I(inode)->i_protect &= ~FIBF_ARCHIVED;

		mark_inode_dirty(inode);

	}



	return ret;

}



static sector_t _affs_bmap(struct address_space *mapping, sector_t block)

{

	return generic_block_bmap(mapping,block,affs_get_block);
@@ -438,7 +456,7 @@ const struct address_space_operations affs_aops = { 
	.readpage = affs_readpage,

	.writepage = affs_writepage,

	.write_begin = affs_write_begin,

	.write_end = generic_write_end,

	.write_end = affs_write_end,

	.direct_IO = affs_direct_IO,

	.bmap = _affs_bmap

};
@@ -795,6 +813,12 @@ done: 
	if (tmp > inode->i_size)

		inode->i_size = AFFS_I(inode)->mmu_private = tmp;



	/* Clear Archived bit on file writes, as AmigaOS would do */

	if (AFFS_I(inode)->i_protect & FIBF_ARCHIVED) {

		AFFS_I(inode)->i_protect &= ~FIBF_ARCHIVED;

		mark_inode_dirty(inode);

	}



err_first_bh:

	unlock_page(page);

	put_page(page);

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