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Dave Hansen ce8d2cdf3d r/o bind mounts: filesystem helpers for custom 'struct file's ... Why do we need r/o bind mounts? This feature allows a read-only view into a read-write filesystem. In the process of doing that, it also provides infrastructure for keeping track of the number of writers to any given mount. This has a number of uses. It allows chroots to have parts of filesystems writable. It will be useful for containers in the future because users may have root inside a container, but should not be allowed to write to somefilesystems. This also replaces patches that vserver has had out of the tree for several years. It allows security enhancement by making sure that parts of your filesystem read-only (such as when you don't trust your FTP server), when you don't want to have entire new filesystems mounted, or when you want atime selectively updated. I've been using the following script to test that the feature is working as desired. It takes a directory and makes a regular bind and a r/o bind mount of it. It then performs some normal filesystem operations on the three directories, including ones that are expected to fail, like creating a file on the r/o mount. This patch: Some filesystems forego the vfs and may_open() and create their own 'struct file's. This patch creates a couple of helper functions which can be used by these filesystems, and will provide a unified place which the r/o bind mount code may patch. Also, rename an existing, static-scope init_file() to a less generic name. Signed-off-by: Dave Hansen <haveblue@us.ibm.com> Cc: Christoph Hellwig <hch@lst.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		18 years ago
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9p	9p: fix bad error path in conversion routines	18 years ago
802	[NET]: Move hardware header operations out of netdevice.	18 years ago
8021q	[8021Q]: transfer dev_id from real device	18 years ago
appletalk	[NET]: sparse warning fixes	18 years ago
atm	Driver core: change add_uevent_var to use a struct	18 years ago
ax25	[NET]: Move hardware header operations out of netdevice.	18 years ago
bluetooth	[BLUETOOTH]: Make hidp_setup_input() return int	18 years ago
bridge	[BRIDGE]: Remove SKB share checks in br_nf_pre_routing().	18 years ago
core	[NEIGH]: Ensure that pneigh_lookup is protected with RTNL	18 years ago
dccp	[IPV6]: Replace sk_buff ** with sk_buff * in input handlers	18 years ago
decnet	[NETFILTER]: Replace sk_buff ** with sk_buff *	18 years ago
econet	[NET]: Wrap netdevice hardware header creation.	18 years ago
ethernet	[NET]: Move hardware header operations out of netdevice.	18 years ago
ieee80211	[IEEE80211]: Fix softmac lockdep reports.	18 years ago
ipv4	[INET]: kmalloc+memset -> kzalloc in frag_alloc_queue	18 years ago
ipv6	[IPV6]: Consolidate the ip6_pol_route_(input|output) pair	18 years ago
ipx	[NET]: Make the device list and device lookups per namespace.	18 years ago
irda	[IRDA]: Make the IRDA use the seq_open_private()	18 years ago
iucv	[AF_IUCV]: postpone receival of iucv-packets	18 years ago
key	[IPSEC]: Lock state when copying non-atomic fields to user-space	18 years ago
lapb	…
llc	[NET]: Introduce and use print_mac() and DECLARE_MAC_BUF()	18 years ago
mac80211	[PATCH] mac80211: Defer setting of RX_FLAG_DECRYPTED.	18 years ago
netfilter	[NETFILTER]: Replace sk_buff ** with sk_buff *	18 years ago
netlabel	[NETLINK]: Introduce nested and byteorder flag to netlink attribute	18 years ago
netlink	[NETLINK]: Don't leak 'listeners' in netlink_kernel_create()	18 years ago
netrom	[NET]: Move hardware header operations out of netdevice.	18 years ago
packet	[NET]: Move hardware header operations out of netdevice.	18 years ago
rfkill	[RFKILL]: Add support for hardware-only rfkill buttons	18 years ago
rose	[NET]: Move hardware header operations out of netdevice.	18 years ago
rxrpc	KEYS: Make request_key() and co fundamentally asynchronous	18 years ago
sched	[NETFILTER]: Replace sk_buff ** with sk_buff *	18 years ago
sctp	Remove "unsafe" from module struct	18 years ago
sunrpc	Slab API: remove useless ctor parameter and reorder parameters	18 years ago
tipc	[NET]: Wrap netdevice hardware header creation.	18 years ago
unix	sched: affine sync wakeups	18 years ago
wanrouter	[NET]: Make /proc/net per network namespace	18 years ago
wireless	Driver core: change add_uevent_var to use a struct	18 years ago
x25	[NET]: Make the device list and device lookups per namespace.	18 years ago
xfrm	[NET]: make netlink user -> kernel interface synchronious	18 years ago
Kconfig	[NET]: Add network namespace clone & unshare support.	18 years ago
Makefile	…
TUNABLE	…
compat.c	…
nonet.c	…
socket.c	r/o bind mounts: filesystem helpers for custom 'struct file's	18 years ago
sysctl_net.c	…