diff options
author | Miklos Szeredi <miklos@szeredi.hu> | 2005-09-09 20:10:31 (GMT) |
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committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-09-09 21:03:45 (GMT) |
commit | 1e9a4ed9396e9c31139721b639550ffb1df17065 (patch) | |
tree | 213566cf1294f5dd8f6ff62ceb3557b5f5b6c59c /fs/fuse/dir.c | |
parent | b6aeadeda22a9aa322fdfcd3f4c69ccf0da5cbdd (diff) | |
download | linux-fsl-qoriq-1e9a4ed9396e9c31139721b639550ffb1df17065.tar.xz |
[PATCH] FUSE - mount options
This patch adds miscellaneous mount options to the FUSE filesystem.
The following mount options are added:
o default_permissions: check permissions with generic_permission()
o allow_other: allow other users to access files
o allow_root: allow root to access files
o kernel_cache: don't invalidate page cache on open
Signed-off-by: Miklos Szeredi <miklos@szeredi.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'fs/fuse/dir.c')
-rw-r--r-- | fs/fuse/dir.c | 35 |
1 files changed, 32 insertions, 3 deletions
diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c index 8adc1ee..0950455 100644 --- a/fs/fuse/dir.c +++ b/fs/fuse/dir.c @@ -418,7 +418,8 @@ static int fuse_revalidate(struct dentry *entry) struct fuse_conn *fc = get_fuse_conn(inode); if (get_node_id(inode) == FUSE_ROOT_ID) { - if (current->fsuid != fc->user_id) + if (!(fc->flags & FUSE_ALLOW_OTHER) && + current->fsuid != fc->user_id) return -EACCES; } else if (time_before_eq(jiffies, fi->i_time)) return 0; @@ -430,9 +431,31 @@ static int fuse_permission(struct inode *inode, int mask, struct nameidata *nd) { struct fuse_conn *fc = get_fuse_conn(inode); - if (current->fsuid != fc->user_id) + if (!(fc->flags & FUSE_ALLOW_OTHER) && current->fsuid != fc->user_id) return -EACCES; - else { + else if (fc->flags & FUSE_DEFAULT_PERMISSIONS) { + int err = generic_permission(inode, mask, NULL); + + /* If permission is denied, try to refresh file + attributes. This is also needed, because the root + node will at first have no permissions */ + if (err == -EACCES) { + err = fuse_do_getattr(inode); + if (!err) + err = generic_permission(inode, mask, NULL); + } + + /* FIXME: Need some mechanism to revoke permissions: + currently if the filesystem suddenly changes the + file mode, we will not be informed about it, and + continue to allow access to the file/directory. + + This is actually not so grave, since the user can + simply keep access to the file/directory anyway by + keeping it open... */ + + return err; + } else { int mode = inode->i_mode; if ((mask & MAY_WRITE) && IS_RDONLY(inode) && (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode))) @@ -636,6 +659,12 @@ static int fuse_setattr(struct dentry *entry, struct iattr *attr) int err; int is_truncate = 0; + if (fc->flags & FUSE_DEFAULT_PERMISSIONS) { + err = inode_change_ok(inode, attr); + if (err) + return err; + } + if (attr->ia_valid & ATTR_SIZE) { unsigned long limit; is_truncate = 1; |