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Nick Piggin 56a76f8275 fs: fix page_mkwrite error cases in core code and btrfs ... page_mkwrite is called with neither the page lock nor the ptl held. This means a page can be concurrently truncated or invalidated out from underneath it. Callers are supposed to prevent truncate races themselves, however previously the only thing they can do in case they hit one is to raise a SIGBUS. A sigbus is wrong for the case that the page has been invalidated or truncated within i_size (eg. hole punched). Callers may also have to perform memory allocations in this path, where again, SIGBUS would be wrong. The previous patch ("mm: page_mkwrite change prototype to match fault") made it possible to properly specify errors. Convert the generic buffer.c code and btrfs to return sane error values (in the case of page removed from pagecache, VM_FAULT_NOPAGE will cause the fault handler to exit without doing anything, and the fault will be retried properly). This fixes core code, and converts btrfs as a template/example. All other filesystems defining their own page_mkwrite should be fixed in a similar manner. Acked-by: Chris Mason <chris.mason@oracle.com> Signed-off-by: Nick Piggin <npiggin@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		16 years ago
..
Kconfig	Btrfs: make btrfs acls selectable	16 years ago
Makefile	…
acl.c	Btrfs: Fix checkpatch.pl warnings	16 years ago
async-thread.c	Btrfs: async threads should try harder to find work	16 years ago
async-thread.h	…
btrfs_inode.h	Btrfs: add better -ENOSPC handling	16 years ago
compat.h	Btrfs: drop remaining LINUX_KERNEL_VERSION checks and compat code	16 years ago
compression.c	Btrfs: removed unused #include <version.h>'s	16 years ago
compression.h	…
crc32c.h	Btrfs: Drop the hardware crc32c asm code	16 years ago
ctree.c	Btrfs: fix spinlock assertions on UP systems	16 years ago
ctree.h	mm: page_mkwrite change prototype to match fault	16 years ago
dir-item.c	Btrfs: Fix checkpatch.pl warnings	16 years ago
disk-io.c	btrfs: get rid of current_is_pdflush() in btrfs_btree_balance_dirty	16 years ago
disk-io.h	Btrfs: make a lockdep class for the extent buffer locks	16 years ago
export.c	Btrfs: Fix checkpatch.pl warnings	16 years ago
export.h	…
extent-tree.c	Btrfs: Fix locking around adding new space_info	16 years ago
extent_io.c	Btrfs: remove unused code in split_state()	16 years ago
extent_io.h	Btrfs: Change btree locking to use explicit blocking points	16 years ago
extent_map.c	Btrfs: removed unused #include <version.h>'s	16 years ago
extent_map.h	…
file-item.c	Btrfs: tree logging checksum fixes	16 years ago
file.c	Btrfs: add better -ENOSPC handling	16 years ago
free-space-cache.c	Btrfs: Fix checkpatch.pl warnings	16 years ago
hash.h	…
inode-item.c	Btrfs: make things static and include the right headers	16 years ago
inode-map.c	Btrfs: remove btrfs_init_path	16 years ago
inode.c	fs: fix page_mkwrite error cases in core code and btrfs	16 years ago
ioctl.c	Btrfs: add better -ENOSPC handling	16 years ago
ioctl.h	Btrfs: fix ioctl arg size (userland incompatible change!)	16 years ago
locking.c	Btrfs: fix spinlock assertions on UP systems	16 years ago
locking.h	Btrfs: fix spinlock assertions on UP systems	16 years ago
ordered-data.c	Btrfs: simplify iteration codes	16 years ago
ordered-data.h	Btrfs: move data checksumming into a dedicated tree	16 years ago
orphan.c	…
print-tree.c	Btrfs: Fix checkpatch.pl warnings	16 years ago
print-tree.h	…
ref-cache.c	Btrfs: Make btrfs_drop_snapshot work in larger and more efficient chunks	16 years ago
ref-cache.h	Btrfs: Make btrfs_drop_snapshot work in larger and more efficient chunks	16 years ago
root-tree.c	Btrfs: Fix checkpatch.pl warnings	16 years ago
struct-funcs.c	Btrfs: Fix checkpatch.pl warnings	16 years ago
super.c	Btrfs: don't clean old snapshots on sync(1)	16 years ago
sysfs.c	Btrfs: Fix checkpatch.pl warnings	16 years ago
transaction.c	Btrfs: hold trans_mutex when using btrfs_record_root_in_trans	16 years ago
transaction.h	Btrfs: Fix checkpatch.pl warnings	16 years ago
tree-defrag.c	Btrfs: Change btree locking to use explicit blocking points	16 years ago
tree-log.c	Btrfs: hold trans_mutex when using btrfs_record_root_in_trans	16 years ago
tree-log.h	…
version.h	…
version.sh	Btrfs: Fixes for 2.6.28-rc API changes	16 years ago
volumes.c	Btrfs: Clear space_info full when adding new devices	16 years ago
volumes.h	Btrfs: shared seed device	16 years ago
xattr.c	Btrfs: selinux support	16 years ago
xattr.h	Btrfs: selinux support	16 years ago
zlib.c	Btrfs: Fix checkpatch.pl warnings	16 years ago