affs-for-5.9-tag

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Merge tag 'affs-for-5.9-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux

Pull affs fix from David Sterba:
 "One fix to make permissions work the same way as on AmigaOS"

* tag 'affs-for-5.9-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux:
  affs: fix basic permission bits to actually work
This commit is contained in:
Linus Torvalds 2020-09-03 08:41:36 -07:00
commit 26acd8b07a
3 changed files with 62 additions and 7 deletions

View File

@ -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 set W and D for user, group and others.
- w permission will allow W for user, group and others.
- x permission of the user will set E for plain files.
- x permission of the user will allow 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.

View File

@ -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;
}

View File

@ -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);