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linux-stable-rt/fs
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David Gibson 1e8f889b10 [PATCH] Hugetlb: Copy on Write support 
Implement copy-on-write support for hugetlb mappings so MAP_PRIVATE can be
supported.  This helps us to safely use hugetlb pages in many more
applications.  The patch makes the following changes.  If needed, I also have
it broken out according to the following paragraphs.

1. Add a pair of functions to set/clear write access on huge ptes.  The
   writable check in make_huge_pte is moved out to the caller for use by COW
   later.

2. Hugetlb copy-on-write requires special case handling in the following
   situations:

   - copy_hugetlb_page_range() - Copied pages must be write protected so
     a COW fault will be triggered (if necessary) if those pages are written
     to.

   - find_or_alloc_huge_page() - Only MAP_SHARED pages are added to the
     page cache.  MAP_PRIVATE pages still need to be locked however.

3. Provide hugetlb_cow() and calls from hugetlb_fault() and
   hugetlb_no_page() which handles the COW fault by making the actual copy.

4. Remove the check in hugetlbfs_file_map() so that MAP_PRIVATE mmaps
   will be allowed.  Make MAP_HUGETLB exempt from the depricated VM_RESERVED
   mapping check.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Adam Litke <agl@us.ibm.com>
Cc: William Lee Irwin III <wli@holomorphy.com>
Cc: "Seth, Rohit" <rohit.seth@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
 		2006-01-06 08:33:23 -08:00
..
9p [INET_SOCK]: Move struct inet_sock & helper functions to net/inet_sock.h 2006-01-03 13:11:21 -08:00
adfs [PATCH] changing CONFIG_LOCALVERSION rebuilds too much, for no good reason 2005-11-09 07:55:57 -08:00
affs [PATCH] kfree cleanup: fs 2005-11-07 07:54:06 -08:00
afs fs/afs/callback.c should #include "cmservice.h" 2005-11-08 16:56:17 +01:00
autofs [PATCH] kfree cleanup: fs 2005-11-07 07:54:06 -08:00
autofs4 [PATCH] kfree cleanup: fs 2005-11-07 07:54:06 -08:00
befs remove unused fs/befs/attribute.c 2005-11-08 16:54:53 +01:00
bfs
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cifs [CIFS] For previous fix, mode on mkdir needed S_IFDIR left out. 2005-11-29 22:38:43 -08:00
coda
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configfs [PATCH] configfs: User-driven configuration filesystem 2006-01-03 11:45:28 -08:00
cramfs
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debugfs
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devfs [PATCH] kfree cleanup: fs 2005-11-07 07:54:06 -08:00
devpts
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efs
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exportfs
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ext2 [PATCH] ext2: remove duplicate newlines in ext2_fill_super 2005-11-13 18:14:17 -08:00
ext3 [PATCH] ext3: Wrong return value for EXT3_IOC_GROUP_ADD 2005-11-28 14:42:24 -08:00
fat [PATCH] fat: respect silent mount flag 2005-11-09 07:55:58 -08:00
freevxfs fs/freevxfs/: add #include's 2005-11-08 16:47:45 +01:00
fuse [PATCH] fuse: check for invalid node ID in fuse_create_open() 2005-11-28 14:42:26 -08:00
hfs [PATCH] changing CONFIG_LOCALVERSION rebuilds too much, for no good reason 2005-11-09 07:55:57 -08:00
hfsplus [PATCH] hfsplus oops fix 2006-01-06 08:33:20 -08:00
hostfs [PATCH] uml: hostfs - fix possible PAGE_CACHE_SHIFT overflows 2005-12-29 09:48:15 -08:00
hpfs [PATCH] hpfs: remove spurious mtime update 2005-11-09 07:55:57 -08:00
hppfs
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hugetlbfs [PATCH] Hugetlb: Copy on Write support 2006-01-06 08:33:23 -08:00
isofs [PATCH] kfree cleanup: fs 2005-11-07 07:54:06 -08:00
jbd [PATCH] kfree cleanup: fs 2005-11-07 07:54:06 -08:00
jffs jffs_fm.c should #include "intrep.h" 2005-11-08 16:48:36 +01:00
jffs2 [JFFS2] Fix the slab cache constructor of 'struct jffs2_inode_info' objects. 2005-11-29 16:57:17 +01:00
jfs
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lockd NLM: Fix Oops in nlmclnt_mark_reclaim() 2005-12-19 23:12:31 -05:00
minix
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msdos
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ncpfs [PATCH] add a file_permission helper 2005-11-09 07:55:59 -08:00
nfs [INET_SOCK]: Move struct inet_sock & helper functions to net/inet_sock.h 2006-01-03 13:11:21 -08:00
nfs_common
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nfsd [PATCH] nfsd: check for read-only exports before setting acls 2005-12-20 10:31:33 -08:00
nls
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ntfs update the email address of Randy Dunlap 2006-01-03 13:37:51 +01:00
ocfs2 [PATCH] This patch contains the following cleanups: 2006-01-03 11:45:55 -08:00
openpromfs [PATCH] kfree cleanup: fs 2005-11-07 07:54:06 -08:00
partitions [PATCH] Driver core: Make block devices create the proper symlink name 2006-01-04 16:18:09 -08:00
proc Insanity avoidance in /proc 2005-12-30 08:39:10 -08:00
qnx4 fs/qnx4/bitmap.c: #if 0 qnx4_new_block() 2006-01-03 13:21:37 +01:00
ramfs
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reiserfs s/retreiv/retriev/g 2006-01-03 13:27:11 +01:00
relayfs [PATCH] relayfs: remove warning printk() in relay_switch_subbuf() 2005-12-20 17:33:22 -08:00
romfs
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smbfs [PATCH] smbfs: 'names_cache' memory leak 2005-11-07 07:53:39 -08:00
sysfs [PATCH] sysfs: handle failures in sysfs_make_dirent 2006-01-04 16:18:09 -08:00
sysv
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udf remove pointers to the defunct UDF mailing list 2006-01-03 13:19:13 +01:00
ufs [PATCH] kfree cleanup: fs 2005-11-07 07:54:06 -08:00
vfat
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xfs [PATCH] xfs: missing gfp_t annotations 2005-12-15 10:04:29 -08:00
Kconfig [PATCH] o Update Kconfig documentation to reflect support for readonly mounts. 2006-01-03 11:45:57 -08:00
Kconfig.binfmt
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Makefile [PATCH] OCFS2: The Second Oracle Cluster Filesystem 2006-01-03 11:45:48 -08:00
aio.c [PATCH] aio: replace locking comments with assert_spin_locked() 2005-11-13 18:14:16 -08:00
attr.c
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bad_inode.c
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binfmt_aout.c
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binfmt_elf.c [PATCH] kfree cleanup: fs 2005-11-07 07:54:06 -08:00
binfmt_elf_fdpic.c [PATCH] kfree cleanup: fs 2005-11-07 07:54:06 -08:00
binfmt_em86.c
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binfmt_flat.c
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binfmt_misc.c [PATCH] add a file_permission helper 2005-11-09 07:55:59 -08:00
binfmt_script.c
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binfmt_som.c
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bio.c [SCSI] seperate max_sectors from max_hw_sectors 2005-12-15 15:11:40 -08:00
block_dev.c
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buffer.c [PATCH] __find_get_block_slow() cleanup 2005-11-07 07:53:39 -08:00
char_dev.c
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compat.c Relax the rw_verify_area() error checking. 2006-01-04 16:20:40 -08:00
compat_ioctl.c [COMPAT] net: SIOCGIFCONF data corruption 2005-11-20 13:41:59 -08:00
dcache.c [PATCH] Remove hlist_for_each_rcu() API, convert existing use to hlist_for_each_entry_rcu 2005-11-07 07:53:35 -08:00
dcookies.c
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direct-io.c
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dnotify.c
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dquot.c [PATCH] Fix oops in vfs_quotaon_mount() 2005-11-28 14:42:26 -08:00
eventpoll.c
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exec.c VM: add common helper function to create the page tables 2005-11-29 14:03:14 -08:00
fcntl.c
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fifo.c
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file.c
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file_table.c [PATCH] mm: rename kmem_cache_s to kmem_cache 2005-11-07 07:53:24 -08:00
filesystems.c
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fs-writeback.c [PATCH] kernel-docs: fix kernel-doc format problems 2005-11-07 07:53:55 -08:00
inode.c
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inotify.c [PATCH] inotify: add two inotify_add_watch flags 2005-12-12 08:57:43 -08:00
ioctl.c
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ioprio.c fs/ioprio.c should #include <linux/syscalls.h> 2005-11-08 16:57:02 +01:00
libfs.c
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locks.c [PATCH] VFS: local denial-of-service with file leases 2005-11-13 12:29:58 -05:00
mbcache.c [PATCH] kfree cleanup: fs 2005-11-07 07:54:06 -08:00
mpage.c [PATCH] add AOP_TRUNCATED_PAGE, prepend AOP_ to WRITEPAGE_ACTIVATE 2006-01-03 11:45:42 -08:00
namei.c [PATCH] fs/namei.c: make path_lookup_create() static 2005-11-09 07:56:40 -08:00
namespace.c [PATCH] add a vfs_permission helper 2005-11-09 07:55:58 -08:00
nfsctl.c
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open.c [PATCH] add a file_permission helper 2005-11-09 07:55:59 -08:00
pipe.c
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pnode.c [PATCH] unbindable mounts 2005-11-07 18:18:11 -08:00
pnode.h [PATCH] unbindable mounts 2005-11-07 18:18:11 -08:00
posix_acl.c
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quota.c [PATCH] quota: small cleanups 2005-11-07 07:53:39 -08:00
quota_v1.c
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quota_v2.c
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read_write.c Relax the rw_verify_area() error checking. 2006-01-04 16:20:40 -08:00
readdir.c
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select.c
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seq_file.c [PATCH] allow callers of seq_open do allocation themselves 2005-11-07 18:18:09 -08:00
stat.c
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super.c [PATCH] remove mount/umount uevents from superblock handling 2006-01-04 16:18:07 -08:00
xattr.c [PATCH] Fix listxattr() for generic security attributes 2005-12-12 08:57:42 -08:00
xattr_acl.c
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