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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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acpi	…
asm-alpha	increase AT_VECTOR_SIZE to terminate saved_auxv properly	18 years ago
asm-arm	remove include/asm-*/ipc.h	18 years ago
asm-arm26	softlockup: make asm/irq_regs.h available on every platform	18 years ago
asm-avr32	Remove dma_cache_(wback|inv|wback_inv) functions	18 years ago
asm-blackfin	Remove dma_cache_(wback|inv|wback_inv) functions	18 years ago
asm-cris	remove include/asm-*/ipc.h	18 years ago
asm-frv	remove include/asm-*/ipc.h	18 years ago
asm-generic	remove include/asm-*/ipc.h	18 years ago
asm-h8300	Remove dma_cache_(wback|inv|wback_inv) functions	18 years ago
asm-ia64	increase AT_VECTOR_SIZE to terminate saved_auxv properly	18 years ago
asm-m32r	remove include/asm-*/ipc.h	18 years ago
asm-m68k	Remove dma_cache_(wback|inv|wback_inv) functions	18 years ago
asm-m68knommu	Remove dma_cache_(wback|inv|wback_inv) functions	18 years ago
asm-mips	Remove dma_cache_(wback|inv|wback_inv) functions	18 years ago
asm-parisc	Remove dma_cache_(wback|inv|wback_inv) functions	18 years ago
asm-powerpc	increase AT_VECTOR_SIZE to terminate saved_auxv properly	18 years ago
asm-ppc	Remove dma_cache_(wback|inv|wback_inv) functions	18 years ago
asm-s390	remove include/asm-*/ipc.h	18 years ago
asm-sh	increase AT_VECTOR_SIZE to terminate saved_auxv properly	18 years ago
asm-sh64	Remove dma_cache_(wback|inv|wback_inv) functions	18 years ago
asm-sparc	Remove dma_cache_(wback|inv|wback_inv) functions	18 years ago
asm-sparc64	Remove dma_cache_(wback|inv|wback_inv) functions	18 years ago
asm-um	remove include/asm-*/ipc.h	18 years ago
asm-v850	remove include/asm-*/ipc.h	18 years ago
asm-x86	increase AT_VECTOR_SIZE to terminate saved_auxv properly	18 years ago
asm-xtensa	remove strict ansi check from __u64 in asm/types.h	18 years ago
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keys	KEYS: Make request_key() and co fundamentally asynchronous	18 years ago
linux	r/o bind mounts: filesystem helpers for custom 'struct file's	18 years ago
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scsi	do not export /usr/include/scsi in make headers_install	18 years ago
sound	…
video	…
xen	…
Kbuild	do not export /usr/include/scsi in make headers_install	18 years ago