linux.git/fs/ramfs, branch v2.6.31

fs/ramfs/file-nommu.c needs include/linux/sched.h

2009-07-30T02:10:36+00:00

This file makes use of various macros defined in files like asm/current.h
or asm-generic/resource.h.  All these files can be included via sched.h.
The building of the !MMU ARM kernel (with additional patches) fails
without this change.

Signed-off-by: Catalin Marinas 
Acked-by: David Howells 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

ramfs: ignore unknown mount options

2009-06-15T00:58:25+00:00

On systems where CONFIG_SHMEM is disabled, mounting tmpfs filesystems can
fail when tmpfs options are used.  This is because tmpfs creates a small
wrapper around ramfs which rejects unknown options, and ramfs itself only
supports a tiny subset of what tmpfs supports.  This makes it pretty hard
to use the same userspace systems across different configuration systems.
As such, ramfs should ignore the tmpfs options when tmpfs is merely a
wrapper around ramfs.

This used to work before commit c3b1b1cbf0 as previously, ramfs would
ignore all options.  But now, we get:
ramfs: bad mount option: size=10M
mount: mounting mdev on /dev failed: Invalid argument

Another option might be to restore the previous behavior, where ramfs
simply ignored all unknown mount options ... which is what Hugh prefers.

Signed-off-by: Mike Frysinger 
Signed-off-by: Hugh Dickins 
Acked-by: Matt Mackall 
Acked-by: Wu Fengguang 
Cc: stable@kernel.org
Signed-off-by: Linus Torvalds

ramfs: fix double freeing s_fs_info on failed mount

2009-04-07T14:39:59+00:00

If ramfs mount fails, s_fs_info will be freed twice in ramfs_fill_super()
and ramfs_kill_sb(), leading to kernel oops.

Consolidate and beautify the code.
Make sure s_fs_info and s_root are in known good states.

Acked-by: Wu Fengguang 
Signed-off-by: Ingo Molnar 
Signed-off-by: Linus Torvalds

ramfs: add support for "mode=" mount option

2009-04-01T15:59:22+00:00

Addresses http://bugzilla.kernel.org/show_bug.cgi?id=12843

"I use ramfs instead of tmpfs for /tmp because I don't use swap on my
laptop.  Some apps need 1777 mode for /tmp directory, but ramfs does not
support 'mode=' mount option."

Reported-by: Avan Anishchuk 
Signed-off-by: Wu Fengguang 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

ramfs-nommu: use generic lru cache

2009-04-01T15:59:15+00:00

Instead of open-coding the lru-list-add pagevec batching when expanding a
file mapping from zero, defer to the appropriate page cache function that
also takes care of adding the page to the lru list.

This is cleaner, saves code and reduces the stack footprint by 16 words
worth of pagevec.

Signed-off-by: Johannes Weiner 
Acked-by: David Howells 
Cc: Nick Piggin 
Acked-by: KOSAKI Motohiro 
Cc: Rik van Riel 
Cc: Peter Zijlstra 
Cc: MinChan Kim 
Cc: Lee Schermerhorn 
Cc: Greg Ungerer 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

ramfs: Remove quota call

2009-03-26T01:18:35+00:00

Ramfs has no bussiness in quotas.

Signed-off-by: Jan Kara

nommu: ramfs: don't leak pages when adding to page cache fails

2009-03-14T18:57:22+00:00

When a ramfs nommu mapping is expanded, contiguous pages are allocated
and added to the pagecache.  The caller's reference is then passed on
by moving whole pagevecs to the file lru list.

If the page cache adding fails, make sure that the error path also
moves the pagevec contents which might still contain up to PAGEVEC_SIZE
successfully added pages, of which we would leak references otherwise.

Signed-off-by: Johannes Weiner 
Cc: David Howells 
Cc: Enrik Berkhan 
Cc: Nick Piggin 
Cc: Peter Zijlstra 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

nommu: ramfs: pages allocated to an inode's pagecache may get wrongly discarded

2009-03-14T18:57:22+00:00

The pages attached to a ramfs inode's pagecache by truncation from nothing
- as done by SYSV SHM for example - may get discarded under memory
pressure.

The problem is that the pages are not marked dirty.  Anything that creates
data in an MMU-based ramfs will cause the pages holding that data will
cause the set_page_dirty() aop to be called.

For the NOMMU-based mmap, set_page_dirty() may be called by write(), but
it won't be called by page-writing faults on writable mmaps, and it isn't
called by ramfs_nommu_expand_for_mapping() when a file is being truncated
from nothing to allocate a contiguous run.

The solution is to mark the pages dirty at the point of allocation by the
truncation code.

Signed-off-by: Enrik Berkhan 
Signed-off-by: David Howells 
Cc: Peter Zijlstra 
Cc: Nick Piggin 
Cc: Johannes Weiner 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

NOMMU: Fix cleanup handling in ramfs_nommu_get_umapped_area()

2009-01-08T12:04:46+00:00

Fix cleanup handling in ramfs_nommu_get_umapped_area() by only freeing the
number of pages that find_get_pages() said it had returned (nr) rather than
attempting to free the number of pages we asked for (lpages) - thus avoiding
the situation whereby put_page() may be handed NULL pointers if
find_get_pages() returned fewer pages that were requested.

Also avoid a warning about nr being uninitialised and the need for an
if-statement in the cleanup path by using appropriate gotos.

Signed-off-by: David Howells

zero i_uid/i_gid on inode allocation

2009-01-05T16:54:28+00:00

... and don't bother in callers.  Don't bother with zeroing i_blocks,
while we are at it - it's already been zeroed.

i_mode is not worth the effort; it has no common default value.

Signed-off-by: Al Viro