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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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Makefile	[PATCH] sysctl: move SYSV IPC sysctls to their own file	18 years ago
compat.c	fix logic error in ipc compat semctl()	18 years ago
compat_mq.c	…
ipc_sysctl.c	ipc namespace: remove config ipc ns fix	18 years ago
mqueue.c	Slab API: remove useless ctor parameter and reorder parameters	18 years ago
msg.c	arch/i386/* fs/* ipc/*: mark variables with uninitialized_var()	18 years ago
msgutil.c	[PATCH] getting rid of all casts of k[cmz]alloc() calls	18 years ago
sem.c	arch/i386/* fs/* ipc/*: mark variables with uninitialized_var()	18 years ago
shm.c	r/o bind mounts: filesystem helpers for custom 'struct file's	18 years ago
util.c	remove CONFIG_UTS_NS and CONFIG_IPC_NS	18 years ago
util.h	remove CONFIG_UTS_NS and CONFIG_IPC_NS	18 years ago