30 Mar, 2010
1 commit
-
…it slab.h inclusion from percpu.h
percpu.h is included by sched.h and module.h and thus ends up being
included when building most .c files. percpu.h includes slab.h which
in turn includes gfp.h making everything defined by the two files
universally available and complicating inclusion dependencies.percpu.h -> slab.h dependency is about to be removed. Prepare for
this change by updating users of gfp and slab facilities include those
headers directly instead of assuming availability. As this conversion
needs to touch large number of source files, the following script is
used as the basis of conversion.http://userweb.kernel.org/~tj/misc/slabh-sweep.py
The script does the followings.
* Scan files for gfp and slab usages and update includes such that
only the necessary includes are there. ie. if only gfp is used,
gfp.h, if slab is used, slab.h.* When the script inserts a new include, it looks at the include
blocks and try to put the new include such that its order conforms
to its surrounding. It's put in the include block which contains
core kernel includes, in the same order that the rest are ordered -
alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
doesn't seem to be any matching order.* If the script can't find a place to put a new include (mostly
because the file doesn't have fitting include block), it prints out
an error message indicating which .h file needs to be added to the
file.The conversion was done in the following steps.
1. The initial automatic conversion of all .c files updated slightly
over 4000 files, deleting around 700 includes and adding ~480 gfp.h
and ~3000 slab.h inclusions. The script emitted errors for ~400
files.2. Each error was manually checked. Some didn't need the inclusion,
some needed manual addition while adding it to implementation .h or
embedding .c file was more appropriate for others. This step added
inclusions to around 150 files.3. The script was run again and the output was compared to the edits
from #2 to make sure no file was left behind.4. Several build tests were done and a couple of problems were fixed.
e.g. lib/decompress_*.c used malloc/free() wrappers around slab
APIs requiring slab.h to be added manually.5. The script was run on all .h files but without automatically
editing them as sprinkling gfp.h and slab.h inclusions around .h
files could easily lead to inclusion dependency hell. Most gfp.h
inclusion directives were ignored as stuff from gfp.h was usually
wildly available and often used in preprocessor macros. Each
slab.h inclusion directive was examined and added manually as
necessary.6. percpu.h was updated not to include slab.h.
7. Build test were done on the following configurations and failures
were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my
distributed build env didn't work with gcov compiles) and a few
more options had to be turned off depending on archs to make things
build (like ipr on powerpc/64 which failed due to missing writeq).* x86 and x86_64 UP and SMP allmodconfig and a custom test config.
* powerpc and powerpc64 SMP allmodconfig
* sparc and sparc64 SMP allmodconfig
* ia64 SMP allmodconfig
* s390 SMP allmodconfig
* alpha SMP allmodconfig
* um on x86_64 SMP allmodconfig8. percpu.h modifications were reverted so that it could be applied as
a separate patch and serve as bisection point.Given the fact that I had only a couple of failures from tests on step
6, I'm fairly confident about the coverage of this conversion patch.
If there is a breakage, it's likely to be something in one of the arch
headers which should be easily discoverable easily on most builds of
the specific arch.Signed-off-by: Tejun Heo <tj@kernel.org>
Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
04 Mar, 2010
2 commits
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Remove the EXPORT_UNUSED_SYMBOL of simple_prepare_write
Collapse simple_prepare_write into it's only caller, though
making it simpler and clearer to understand.Signed-off-by: Boaz Harrosh
Signed-off-by: Al Viro -
* simple_commit_write was only called by simple_write_end.
Open coding it makes it tiny bit less heavy on the arithmetic and
much more readable.* While at it use zero_user() for clearing a partial page.
* While at it add a docbook comment for simple_write_end.Signed-off-by: Boaz Harrosh
Signed-off-by: Al Viro
17 Dec, 2009
1 commit
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The EXPORT_SYMBOL for d_alloc_name is in fs/libfs.c but the function
is in fs/dcache.c. Move the EXPORT_SYMBOL to the line immediately
after the closing function brace line in fs/dcache.c as mentioned
in Documentation/CodingStyle.Signed-off-by: H Hartley Sweeten
Signed-off-by: Al Viro
24 Sep, 2009
2 commits
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Currently all simple_attr.set handlers return 0 on success and negative
codes on error. Fix simple_attr_write() to return these error codes.Signed-off-by: Wu Fengguang
Cc: Theodore Ts'o
Cc: Al Viro
Cc: Christoph Hellwig
Cc: Nick Piggin
Signed-off-by: Andrew Morton
Signed-off-by: Al Viro -
Impact: have simple_read_from_buffer conform to standards
It was brought to my attention by Andrew Morton, Theodore Tso, and H.
Peter Anvin that a read from userspace should only return -EFAULT if
nothing was actually read.Looking at the simple_read_from_buffer I noticed that this function does
not conform to that rule. This patch fixes that function.[akpm@linux-foundation.org: simplification suggested by hpa]
[hpa@zytor.com: fix count==0 handling]
Signed-off-by: Steven Rostedt
Cc: Al Viro
Cc: Theodore Ts'o
Cc: Ingo Molnar
Signed-off-by: H. Peter Anvin
Signed-off-by: Andrew Morton
Signed-off-by: Al Viro
19 Aug, 2009
1 commit
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get_sb_pseudo sets s_maxbytes to ~0ULL which becomes negative when cast
to a signed value. Fix it to use MAX_LFS_FILESIZE which casts properly
to a positive signed value.Signed-off-by: Jeff Layton
Reviewed-by: Johannes Weiner
Acked-by: Steve French
Reviewed-by: Christoph Hellwig
Cc: Al Viro
Cc: Robert Love
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
12 Jun, 2009
1 commit
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writes associated buffers, then does sync_inode() to write
the inode itself (and to make it clean). Depends on
->write_inode() honouring the second argument.Signed-off-by: Al Viro
09 May, 2009
1 commit
-
Signed-off-by: Al Viro
03 Apr, 2009
1 commit
-
Impact: cleanup
We want to remove percpu.h from rcupdate.h (for upcoming kmemtrace
changes), but this is not possible currently without breaking the
build because fs.h has an implicit include file depedency: it
uses PAGE_SIZE but does not include asm/page.h which defines it.This problem gets masked in practice because most fs.h using sites
use rcupreempt.h (and other headers) which includes percpu.h which
brings in asm/page.h indirectly.We cannot add asm/page.h to asm/fs.h because page.h is not an
exported header.Move simple_transaction_set() to the other simple-transaction
file helpers in fs/libfs.c.This removes the include file hell and also reduces
kernel size a bit.Acked-by: Al Viro
Cc: Alexey Dobriyan
Cc: Pekka Enberg
Cc: Eduard - Gabriel Munteanu
Cc: paulmck@linux.vnet.ibm.com
LKML-Reference:
Signed-off-by: Ingo Molnar
28 Mar, 2009
2 commits
-
simple_set_mnt() is defined as returning 'int' but always returns 0.
Callers assume simple_set_mnt() never fails and don't properly cleanup if
it were to _ever_ fail. For instance, get_sb_single() and get_sb_nodev()
should:up_write(sb->s_unmount);
deactivate_super(sb);if simple_set_mnt() fails.
Since simple_set_mnt() never fails, would be cleaner if it did not
return anything.[akpm@linux-foundation.org: fix build]
Signed-off-by: Sukadev Bhattiprolu
Acked-by: Serge Hallyn
Cc: Al Viro
Cc: Christoph Hellwig
Signed-off-by: Andrew Morton
Signed-off-by: Al Viro -
Signed-off-by: Al Viro
06 Jan, 2009
2 commits
-
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6:
inotify: fix type errors in interfaces
fix breakage in reiserfs_new_inode()
fix the treatment of jfs special inodes
vfs: remove duplicate code in get_fs_type()
add a vfs_fsync helper
sys_execve and sys_uselib do not call into fsnotify
zero i_uid/i_gid on inode allocation
inode->i_op is never NULL
ntfs: don't NULL i_op
isofs check for NULL ->i_op in root directory is dead code
affs: do not zero ->i_op
kill suid bit only for regular files
vfs: lseek(fd, 0, SEEK_CUR) race condition -
... 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
05 Jan, 2009
1 commit
-
With the write_begin/write_end aops, page_symlink was broken because it
could no longer pass a GFP_NOFS type mask into the point where the
allocations happened. They are done in write_begin, which would always
assume that the filesystem can be entered from reclaim. This bug could
cause filesystem deadlocks.The funny thing with having a gfp_t mask there is that it doesn't really
allow the caller to arbitrarily tinker with the context in which it can be
called. It couldn't ever be GFP_ATOMIC, for example, because it needs to
take the page lock. The only thing any callers care about is __GFP_FS
anyway, so turn that into a single flag.Add a new flag for write_begin, AOP_FLAG_NOFS. Filesystems can now act on
this flag in their write_begin function. Change __grab_cache_page to
accept a nofs argument as well, to honour that flag (while we're there,
change the name to grab_cache_page_write_begin which is more instructive
and does away with random leading underscores).This is really a more flexible way to go in the end anyway -- if a
filesystem happens to want any extra allocations aside from the pagecache
ones in ints write_begin function, it may now use GFP_KERNEL (rather than
GFP_NOFS) for common case allocations (eg. ocfs2_alloc_write_ctxt, for a
random example).[kosaki.motohiro@jp.fujitsu.com: fix ubifs]
[kosaki.motohiro@jp.fujitsu.com: fix fuse]
Signed-off-by: Nick Piggin
Reviewed-by: KOSAKI Motohiro
Cc: [2.6.28.x]
Signed-off-by: KOSAKI Motohiro
Signed-off-by: Andrew Morton
[ Cleaned up the calling convention: just pass in the AOP flags
untouched to the grab_cache_page_write_begin() function. That
just simplifies everybody, and may even allow future expansion of the
logic. - Linus ]
Signed-off-by: Linus Torvalds
31 Oct, 2008
1 commit
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Nothing uses prepare_write or commit_write. Remove them from the tree
completely.[akpm@linux-foundation.org: schedule simple_prepare_write() for unexporting]
Signed-off-by: Nick Piggin
Cc: Christoph Hellwig
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
23 Oct, 2008
1 commit
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The calling conventions of d_alloc_anon are rather unfortunate for all
users, and it's name is not very descriptive either.Add d_obtain_alias as a new exported helper that drops the inode
reference in the failure case, too and allows to pass-through NULL
pointers and inodes to allow for tail-calls in the export operations.Incidentally this helper already existed as a private function in
libfs.c as exportfs_d_alloc so kill that one and switch the callers
to d_obtain_alias.Signed-off-by: Christoph Hellwig
Signed-off-by: Al Viro
31 Jul, 2008
1 commit
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This commit:
commit ba52de123d454b57369f291348266d86f4b35070
Author: Theodore Ts'o
Date: Wed Sep 27 01:50:49 2006 -0700[PATCH] inode-diet: Eliminate i_blksize from the inode structure
caused the block size used by pseudo-filesystems to decrease from
PAGE_SIZE to 1024 leading to a doubling of the number of context switches
during a kernbench run.Signed-off-by: Alex Nixon
Cc: Andi Kleen
Cc: Jeremy Fitzhardinge
Cc: Peter Zijlstra
Cc: Ingo Molnar
Cc: Ian Campbell
Cc: "Theodore Ts'o"
Cc: Alexander Viro
Cc: Hugh Dickins
Cc: Jens Axboe
Cc: [2.6.25.x, 2.6.26.x]
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
05 Jul, 2008
1 commit
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Add kernel-doc comments describing simple_read_from_buffer and
memory_read_from_buffer.Signed-off-by: Akinobu Mita
Cc: Christoph Hellwig
Cc: "Randy.Dunlap"
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
07 Jun, 2008
1 commit
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This patch introduces memory_read_from_buffer().
The only difference between memory_read_from_buffer() and
simple_read_from_buffer() is which address space the function copies to.simple_read_from_buffer copies to user space memory.
memory_read_from_buffer copies to normal memory.Signed-off-by: Akinobu Mita
Cc: Al Viro
Cc: Doug Warzecha
Cc: Zhang Rui
Cc: Matt Domsch
Cc: Abhay Salunke
Cc: Greg Kroah-Hartman
Cc: Markus Rechberger
Cc: Kay Sievers
Cc: Bob Moore
Cc: Thomas Renninger
Cc: Len Brown
Cc: Benjamin Herrenschmidt
Cc: "Antonino A. Daplas"
Cc: Krzysztof Helt
Cc: Geert Uytterhoeven
Cc: Martin Schwidefsky
Cc: Heiko Carstens
Cc: Peter Oberparleiter
Cc: Michael Holzheu
Cc: Brian King
Cc: James E.J. Bottomley
Cc: Andrew Vasquez
Cc: Seokmann Ju
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
09 Feb, 2008
3 commits
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simple_attr_close implementes ->release so it should be named accordingly.
Signed-off-by: Christoph Hellwig
Cc:
Cc: Arnd Bergmann
Cc: Greg KH
Cc: Al Viro
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Use mutex_lock_interruptible in simple_attr_read/write.
Signed-off-by: Christoph Hellwig
Cc:
Cc: Arnd Bergmann
Cc: Greg KH
Cc: Al Viro
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Sometimes simple attributes might need to return an error, e.g. for
acquiring a mutex interruptibly. In fact we have that situation in
spufs already which is the original user of the simple attributes. This
patch merged the temporarily forked attributes in spufs back into the
main ones and allows to return errors.[akpm@linux-foundation.org: build fix]
Signed-off-by: Christoph Hellwig
Cc:
Cc: Arnd Bergmann
Cc: Greg KH
Cc: Al Viro
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
06 Feb, 2008
1 commit
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Simplify page cache zeroing of segments of pages through 3 functions
zero_user_segments(page, start1, end1, start2, end2)
Zeros two segments of the page. It takes the position where to
start and end the zeroing which avoids length calculations and
makes code clearer.zero_user_segment(page, start, end)
Same for a single segment.
zero_user(page, start, length)
Length variant for the case where we know the length.
We remove the zero_user_page macro. Issues:
1. Its a macro. Inline functions are preferable.
2. The KM_USER0 macro is only defined for HIGHMEM.
Having to treat this special case everywhere makes the
code needlessly complex. The parameter for zeroing is always
KM_USER0 except in one single case that we open code.Avoiding KM_USER0 makes a lot of code not having to be dealing
with the special casing for HIGHMEM anymore. Dealing with
kmap is only necessary for HIGHMEM configurations. In those
configurations we use KM_USER0 like we do for a series of other
functions defined in highmem.h.Since KM_USER0 is depends on HIGHMEM the existing zero_user_page
function could not be a macro. zero_user_* functions introduced
here can be be inline because that constant is not used when these
functions are called.Also extract the flushing of the caches to be outside of the kmap.
[akpm@linux-foundation.org: fix nfs and ntfs build]
[akpm@linux-foundation.org: fix ntfs build some more]
Signed-off-by: Christoph Lameter
Cc: Steven French
Cc: Michael Halcrow
Cc:
Cc: Steven Whitehouse
Cc: Trond Myklebust
Cc: "J. Bruce Fields"
Cc: Anton Altaparmakov
Cc: Mark Fasheh
Cc: David Chinner
Cc: Michael Halcrow
Cc: Steven French
Cc: Steven Whitehouse
Cc: Trond Myklebust
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
22 Oct, 2007
1 commit
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Add the guts for the new filesystem API to exportfs.
There's now a fh_to_dentry method that returns a dentry for the object looked
for given a filehandle fragment, and a fh_to_parent operation that returns the
dentry for the encoded parent directory in case the file handle contains it.There are default implementations for these methods that only take a callback
for an nfs-enhanced iget variant and implement the rest of the semantics.Signed-off-by: Christoph Hellwig
Cc: Neil Brown
Cc: "J. Bruce Fields"
Cc:
Cc: Dave Kleikamp
Cc: Anton Altaparmakov
Cc: David Chinner
Cc: Timothy Shimmin
Cc: OGAWA Hirofumi
Cc: Hugh Dickins
Cc: Chris Mason
Cc: Jeff Mahoney
Cc: "Vladimir V. Saveliev"
Cc: Steven Whitehouse
Cc: Mark Fasheh
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
17 Oct, 2007
2 commits
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simple_commit_write() can now become static.
Signed-off-by: Adrian Bunk
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
These are intended to replace prepare_write and commit_write with more
flexible alternatives that are also able to avoid the buffered write
deadlock problems efficiently (which prepare_write is unable to do).[mark.fasheh@oracle.com: API design contributions, code review and fixes]
[akpm@linux-foundation.org: various fixes]
[dmonakhov@sw.ru: new aop block_write_begin fix]
Signed-off-by: Nick Piggin
Signed-off-by: Mark Fasheh
Signed-off-by: Dmitriy Monakhov
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
09 May, 2007
2 commits
-
Signed-off-by: Ronni Nielsen
Signed-off-by: Adrian Bunk -
This patch makes it so that simple_fill_super and get_sb_pseudo assign their
root inodes to be number 1. It also fixes up a couple of callers of
simple_fill_super that were passing in files arrays that had an index at
number 1, and adds a warning for any caller that sends in such an array.It would have been nice to have made it so that it wasn't possible to make
such a collision, but some callers need to be able to control what inode
number their entries get, so I think this is the best that can be done.Signed-off-by: Jeff Layton
Cc: Christoph Hellwig
Cc: Al Viro
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
05 Mar, 2007
1 commit
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shmem's super_operations were missed from the recent const-ification;
and simple_fill_super()'s, which can share with get_sb_pseudo()'s.Signed-off-by: Hugh Dickins
Acked-by: Josef 'Jeff' Sipek
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
21 Feb, 2007
1 commit
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simple_prepare_write leaks uninitialised kernel data. This happens because
the it leaves an uninitialised "hole" over the part of the page that the
write is expected to go to. This is fine, but it then marks the page
uptodate, which means a concurrent read can come in and copy the
uninitialised memory into userspace before it written to.Fix it by simply marking it uptodate in simple_commit_write instead, after
the hole has been filled in. This could theoretically break an fs that
uses simple_prepare_write and not simple_commit_write, and that relies on
the incorrect simple_prepare_write behaviour. Luckily, none of those
exists in the tree.Signed-off-by: Nick Piggin
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
13 Feb, 2007
2 commits
-
This patch is inspired by Arjan's "Patch series to mark struct
file_operations and struct inode_operations const".Compile tested with gcc & sparse.
Signed-off-by: Josef 'Jeff' Sipek
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Many struct inode_operations in the kernel can be "const". Marking them const
moves these to the .rodata section, which avoids false sharing with potential
dirty data. In addition it'll catch accidental writes at compile time to
these shared resources.Signed-off-by: Arjan van de Ven
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
09 Dec, 2006
1 commit
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This patch changes struct file to use struct path instead of having
independent pointers to struct dentry and struct vfsmount, and converts all
users of f_{dentry,vfsmnt} in fs/ to use f_path.{dentry,mnt}.Additionally, it adds two #define's to make the transition easier for users of
the f_dentry and f_vfsmnt.Signed-off-by: Josef "Jeff" Sipek
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
01 Oct, 2006
2 commits
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This is mostly included for parity with dec_nlink(), where we will have some
more hooks. This one should stay pretty darn straightforward for now.Signed-off-by: Dave Hansen
Acked-by: Christoph Hellwig
Cc: Al Viro
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
When a filesystem decrements i_nlink to zero, it means that a write must be
performed in order to drop the inode from the filesystem.We're shortly going to have keep filesystems from being remounted r/o between
the time that this i_nlink decrement and that write occurs.So, add a little helper function to do the decrements. We'll tie into it in a
bit to note when i_nlink hits zero.Signed-off-by: Dave Hansen
Acked-by: Christoph Hellwig
Cc: Al Viro
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
30 Sep, 2006
1 commit
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Remove the unnecessary PageUptodate check from simple_readpage. The only
two callers for ->readpage that don't have explicit PageUptodate check are
read_cache_pages and page_cache_read which operate on newly allocated pages
which don't have the flag set.[akpm: use the allegedly-faster clear_page(), too]
Signed-off-by: Pekka Enberg
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
27 Sep, 2006
2 commits
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This eliminates the i_blksize field from struct inode. Filesystems that want
to provide a per-inode st_blksize can do so by providing their own getattr
routine instead of using the generic_fillattr() function.Note that some filesystems were providing pretty much random (and incorrect)
values for i_blksize.[bunk@stusta.de: cleanup]
[akpm@osdl.org: generic_fillattr() fix]
Signed-off-by: "Theodore Ts'o"
Signed-off-by: Adrian Bunk
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
The following patches reduce the size of the VFS inode structure by 28 bytes
on a UP x86. (It would be more on an x86_64 system). This is a 10% reduction
in the inode size on a UP kernel that is configured in a production mode
(i.e., with no spinlock or other debugging functions enabled; if you want to
save memory taken up by in-core inodes, the first thing you should do is
disable the debugging options; they are responsible for a huge amount of bloat
in the VFS inode structure).This patch:
The filesystem or device-specific pointer in the inode is inside a union,
which is pretty pointless given that all 30+ users of this field have been
using the void pointer. Get rid of the union and rename it to i_private, with
a comment to explain who is allowed to use the void pointer. This is just a
cleanup, but it allows us to reuse the union 'u' for something something where
the union will actually be used.[judith@osdl.org: powerpc build fix]
Signed-off-by: "Theodore Ts'o"
Signed-off-by: Judith Lebzelter
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
27 Jun, 2006
1 commit
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This patch converts the combination of list_del(A) and list_add(A, B) to
list_move(A, B).Cc: Greg Kroah-Hartman
Cc: Ram Pai
Signed-off-by: Akinobu Mita
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
