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2015-04-15Merge tag 'for-linus-4.1' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/rw/uml Pull UML updates from Richard Weinberger: - hostfs saw a face lifting - old/broken stuff was removed (SMP, HIGHMEM, SKAS3/4) - random cleanups and bug fixes * tag 'for-linus-4.1' of git://git.kernel.org/pub/scm/linux/kernel/git/rw/uml: (26 commits) um: Print minimum physical memory requirement um: Move uml_postsetup in the init_thread stack um: add a kmsg_dumper x86, UML: fix integer overflow in ELF_ET_DYN_BASE um: hostfs: Reduce number of syscalls in readdir um: Remove broken highmem support um: Remove broken SMP support um: Remove SKAS3/4 support um: Remove ppc cruft um: Remove ia64 cruft um: Remove dead code from stacktrace hostfs: No need to box and later unbox the file mode hostfs: Use page_offset() hostfs: Set page flags in hostfs_readpage() correctly hostfs: Remove superfluous initializations in hostfs_open() hostfs: hostfs_open: Reset open flags upon each retry hostfs: Remove superfluous test in hostfs_open() hostfs: Report append flag in ->show_options() hostfs: Use __getname() in follow_link hostfs: Remove open coded strcpy() ...
2015-04-13um: hostfs: Reduce number of syscalls in readdirRichard Weinberger
Currently hostfs issues every time a seekdir(), in fact it has to do this only upon the first call. Also telldir() can be omitted as we can obtain the directory offset from readdir(). Signed-off-by: Richard Weinberger <richard@nod.at>
2015-04-11make new_sync_{read,write}() staticAl Viro
All places outside of core VFS that checked ->read and ->write for being NULL or called the methods directly are gone now, so NULL {read,write} with non-NULL {read,write}_iter will do the right thing in all cases. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2015-03-26hostfs: No need to box and later unbox the file modeRichard Weinberger
There is really no point in having a function with 10 arguments. Reported-by: Daniel Walter <d.walter@0x90.at> Signed-off-by: Richard Weinberger <richard@nod.at>
2015-03-26hostfs: Use page_offset()Richard Weinberger
The kernel offers a helper function for that, use it. Signed-off-by: Richard Weinberger <richard@nod.at>
2015-03-26hostfs: Set page flags in hostfs_readpage() correctlyRichard Weinberger
In case of an error set the page error flag and clear the up-to-date flag. If the read was successful clear the error flag unconditionally. Signed-off-by: Richard Weinberger <richard@nod.at>
2015-03-26hostfs: Remove superfluous initializations in hostfs_open()Richard Weinberger
Only initialize what we really need. Signed-off-by: Richard Weinberger <richard@nod.at>
2015-03-26hostfs: hostfs_open: Reset open flags upon each retryRichard Weinberger
...otherwise we might end up with an incorrect mode mode. Signed-off-by: Richard Weinberger <richard@nod.at>
2015-03-26hostfs: Remove superfluous test in hostfs_open()Richard Weinberger
Signed-off-by: Richard Weinberger <richard@nod.at>
2015-03-26hostfs: Report append flag in ->show_options()Richard Weinberger
hostfs has an "append" mount option. Report it. Signed-off-by: Richard Weinberger <richard@nod.at>
2015-03-26hostfs: Use __getname() in follow_linkRichard Weinberger
Be consistent with all other functions in hostfs and just use __getname(). Signed-off-by: Richard Weinberger <richard@nod.at>
2015-03-26hostfs: Remove open coded strcpy()Richard Weinberger
Signed-off-by: Richard Weinberger <richard@nod.at>
2015-03-26hostfs: Add a BUG_ON to detect behavior changes of dentry_path_raw()Richard Weinberger
hostfs' __dentry_name() relies on the fact that dentry_path_raw() will place the path name at the end of the provided buffer. While this is okay, add a BUG_ON() to detect behavior changes as soon as possible. Signed-off-by: Richard Weinberger <richard@nod.at>
2015-03-26hostfs: Make hostfs_readpage more readableRichard Weinberger
...to make life easier for future readers of that code. Signed-off-by: Richard Weinberger <richard@nod.at>
2015-03-26hostfs: Handle bogus st.modeRichard Weinberger
Make sure that we return EIO if one passes an invalid st.mode into hostfs. Signed-off-by: Richard Weinberger <richard@nod.at>
2015-03-26hostfs: Allow fsync on directoriesRichard Weinberger
Historically hostfs did not open directories on the host filesystem for performance and memory reasons. But it turned out that this optimization has a drawback. Calling fsync() on a hostfs directory returns immediately with -EINVAL as fsync is not implemented. While this is behavior is strictly speaking correct common userspace like dpkg(1) stumbles over that and makes it impossible to use hostfs as root filesystem. The fix is easy, wire up the existing host open/fsync functions to the directory file operations. Reported-by: Daniel Gröber <dxld@darkboxed.org> Signed-off-by: Richard Weinberger <richard@nod.at>
2015-03-26hostfs: hostfs_file_open: Fix a fd leak in hostfs_file_openRichard Weinberger
In case of a race between to callers of hostfs_file_open() it can happen that a file describtor is leaked. Signed-off-by: Richard Weinberger <richard@nod.at>
2015-03-26hostfs: hostfs_file_open: Switch to data locking modelRichard Weinberger
Instead of serializing hostfs_file_open() we can use a per inode mutex to protect ->mode. Signed-off-by: Richard Weinberger <richard@nod.at>
2014-08-07hostfs: support rename flagsMiklos Szeredi
Support RENAME_NOREPLACE and RENAME_EXCHANGE flags on hostfs if the underlying filesystem supports it. Since renameat2(2) is not yet in any libc, use syscall(2) to invoke the renameat2 syscall. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Cc: Richard Weinberger <richard@nod.at> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2014-05-06write_iter variants of {__,}generic_file_aio_write()Al Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2014-05-06switch simple generic_file_aio_read() users to ->read_iter()Al Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2014-04-03mm + fs: store shadow entries in page cacheJohannes Weiner
Reclaim will be leaving shadow entries in the page cache radix tree upon evicting the real page. As those pages are found from the LRU, an iput() can lead to the inode being freed concurrently. At this point, reclaim must no longer install shadow pages because the inode freeing code needs to ensure the page tree is really empty. Add an address_space flag, AS_EXITING, that the inode freeing code sets under the tree lock before doing the final truncate. Reclaim will check for this flag before installing shadow pages. Signed-off-by: Johannes Weiner <hannes@cmpxchg.org> Reviewed-by: Rik van Riel <riel@redhat.com> Reviewed-by: Minchan Kim <minchan@kernel.org> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Bob Liu <bob.liu@oracle.com> Cc: Christoph Hellwig <hch@infradead.org> Cc: Dave Chinner <david@fromorbit.com> Cc: Greg Thelen <gthelen@google.com> Cc: Hugh Dickins <hughd@google.com> Cc: Jan Kara <jack@suse.cz> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: Luigi Semenzato <semenzato@google.com> Cc: Mel Gorman <mgorman@suse.de> Cc: Metin Doslu <metin@citusdata.com> Cc: Michel Lespinasse <walken@google.com> Cc: Ozgun Erdogan <ozgun@citusdata.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Roman Gushchin <klamm@yandex-team.ru> Cc: Ryan Mallon <rmallon@gmail.com> Cc: Tejun Heo <tj@kernel.org> Cc: Vlastimil Babka <vbabka@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2014-01-26um: hostfs: make functions staticJames Hogan
The hostfs_*() callback functions are all only used within hostfs_kern.c, so make them static. Signed-off-by: James Hogan <james.hogan@imgtec.com> Cc: Jeff Dike <jdike@addtoit.com> Cc: Richard Weinberger <richard@nod.at> Cc: user-mode-linux-devel@lists.sourceforge.net Signed-off-by: Richard Weinberger <richard@nod.at>
2013-11-15consolidate simple ->d_delete() instancesAl Viro
Rename simple_delete_dentry() to always_delete_dentry() and export it. Export simple_dentry_operations, while we are at it, and get rid of their duplicates Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-09-07um: hostfs: Fix writebackRichard Weinberger
We have to implement ->release() and trigger writeback from it. Otherwise we might lose dirty pages at munmap(). Signed-off-by: Richard Weinberger <richard@nod.at>
2013-06-29[readdir] convert hostfsAl Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-05-04hostfs: use kmalloc instead of kzallocJames Hogan
The inode info structure is zeroed at allocation with kzalloc, and then all but one of the fields (including the largest, vfs_inode) are initialised explicitly. Switch to using kmalloc and initialise the remaining field too. Reported-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: James Hogan <james.hogan@imgtec.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-05-04hostfs: move HOSTFS_SUPER_MAGIC to <linux/magic.h>James Hogan
Move HOSTFS_SUPER_MAGIC to <linux/magic.h> to be with it's magical friends from other file systems. Reported-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: James Hogan <james.hogan@imgtec.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-05-04hostfs: remove "will unlock" commentJames Hogan
A "will unlock" comment was added to hostfs in the following commit, along with a spinlock: Commit e9193059b1b3733695d5b80e667778311695aa73 ("hostfs: fix races in dentry_name() and inode_name()"). But the spinlock was subsequently removed in the following commit: Commit ec2447c278ee973d35f38e53ca16ba7f965ae33d ("hostfs: simplify locking"). Since the comment is no longer applicable, remove it. Reported-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: James Hogan <james.hogan@imgtec.com> Cc: Nick Piggin <npiggin@kernel.dk> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-03-13Merge branch 'for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace Pull namespace bugfixes from Eric Biederman: "This tree includes a partial revert for "fs: Limit sys_mount to only request filesystem modules." When I added the new style module aliases to the filesystems I deleted the old ones. A bad move. It turns out that distributions like Arch linux use module aliases when constructing ramdisks. Which meant ultimately that an ext3 filesystem mounted with ext4 would not result in the ext4 module being put into the ramdisk. The other change in this tree adds a handful of filesystem module alias I simply failed to add the first time. Which inconvinienced a few folks using cifs. I don't want to inconvinience folks any longer than I have to so here are these trivial fixes." * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace: fs: Readd the fs module aliases. fs: Limit sys_mount to only request filesystem modules. (Part 3)
2013-03-11fs: Limit sys_mount to only request filesystem modules. (Part 3)Eric W. Biederman
Somehow I failed to add the MODULE_ALIAS_FS for cifs, hostfs, hpfs, squashfs, and udf despite what I thought were my careful checks :( Add them now. Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
2013-03-11hostfs: fix a not needed double checkMarco Stornelli
With the commit 3be2be0a32c18b0fd6d623cda63174a332ca0de1 we removed vmtruncate, but actaully there is no need to call inode_newsize_ok() because the checks are already done in inode_change_ok() at the begin of the function. Signed-off-by: Marco Stornelli <marco.stornelli@gmail.com> Signed-off-by: Richard Weinberger <richard@nod.at>
2013-02-22hostfs: directory methods have no business in non-directory inode_operationsAl Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-02-22new helper: file_inode(file)Al Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-10-10Merge branch 'for-linus-37rc1' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/rw/uml Pull UML changes from Richard Weinberger: "UML receives this time only cleanups. The most outstanding change is the 'include "foo.h"' do 'include <foo.h>' conversion done by Al Viro. It touches many files, that's why the diffstat is rather big." * 'for-linus-37rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rw/uml: typo in UserModeLinux-HOWTO hppfs: fix the return value of get_inode() hostfs: drop vmtruncate um: get rid of pointless include "..." where include <...> will do um: move sysrq.h out of include/shared um/x86: merge 32 and 64 bit variants of ptrace.h um/x86: merge 32 and 64bit variants of checksum.h
2012-10-09hostfs: drop vmtruncateMarco Stornelli
Removed vmtruncate. Signed-off-by: Marco Stornelli <marco.stornelli@gmail.com> Signed-off-by: Richard Weinberger <richard@nod.at>
2012-10-09um: get rid of pointless include "..." where include <...> will doAl Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Richard Weinberger <richard@nod.at>
2012-09-21userns: Convert hostfs to use kuid and kgid where appropriateEric W. Biederman
Cc: Jeff Dike <jdike@addtoit.com> Cc: Richard Weinberger <richard@nod.at> Acked-by: Serge Hallyn <serge.hallyn@canonical.com> Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
2012-07-14don't pass nameidata to ->create()Al Viro
boolean "does it have to be exclusive?" flag is passed instead; Local filesystem should just ignore it - the object is guaranteed not to be there yet. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-07-14stop passing nameidata to ->lookup()Al Viro
Just the flags; only NFS cares even about that, but there are legitimate uses for such argument. And getting rid of that completely would require splitting ->lookup() into a couple of methods (at least), so let's leave that alone for now... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-05-06vfs: Rename end_writeback() to clear_inode()Jan Kara
After we moved inode_sync_wait() from end_writeback() it doesn't make sense to call the function end_writeback() anymore. Rename it to clear_inode() which well says what the function really does - set I_CLEAR flag. Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
2012-03-27Merge branch 'for-linus-3.4-rc1' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/rw/uml Pull UML changes from Richard Weinberger: "Mostly bug fixes and cleanups" * 'for-linus-3.4-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rw/uml: (35 commits) um: Update defconfig um: Switch to large mcmodel on x86_64 MTD: Relax dependencies um: Wire CONFIG_GENERIC_IO up um: Serve io_remap_pfn_range() Introduce CONFIG_GENERIC_IO um: allow SUBARCH=x86 um: most of the SUBARCH uses can be killed um: deadlock in line_write_interrupt() um: don't bother trying to rebuild CHECKFLAGS for USER_OBJS um: use the right ifdef around exports in user_syms.c um: a bunch of headers can be killed by using generic-y um: ptrace-generic.h doesn't need user.h um: kill HOST_TASK_PID um: remove pointless include of asm/fixmap.h from asm/pgtable.h um: asm-offsets.h might as well come from underlying arch... um: merge processor_{32,64}.h a bit... um: switch close_chan() to struct line um: race fix: initialize delayed_work *before* registering IRQ um: line->have_irq is never checked... ...
2012-03-25uml/hostfs: Propagate dirent.d_type to filldir()Geert Uytterhoeven
Currently the (optional) d_type member in struct dirent is always DT_UNKNOWN on hostfs, which may confuse buggy software using readdir(). Make sure to propagate its value from the underlying filesystem if it's available there. Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: Richard Weinberger <richard@nod.at>
2012-03-20switch open-coded instances of d_make_root() to new helperAl Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-01-06vfs: switch ->show_options() to struct dentry *Al Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-01-03switch hostfs_iattr to explicit unsigned shortAl Viro
It's shared between kernel-compiled hostfs_kern and userland-compiled hostfs_user (it's uml stuff). Use explicit type instead of playing silly buggers with mode_t. It's not a userland API per se; it interacts between code compiled with types same as for host kernel and, directly linked to it, code talking to libc. Both sides come from the same kernel source... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-01-03switch ->mknod() to umode_tAl Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-01-03switch ->create() to umode_tAl Viro
vfs_create() ignores everything outside of 16bit subset of its mode argument; switching it to umode_t is obviously equivalent and it's the only caller of the method Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-01-03switch vfs_mkdir() and ->mkdir() to umode_tAl Viro
vfs_mkdir() gets int, but immediately drops everything that might not fit into umode_t and that's the only caller of ->mkdir()... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-01-03vfs: fix the stupidity with i_dentry in inode destructorsAl Viro
Seeing that just about every destructor got that INIT_LIST_HEAD() copied into it, there is no point whatsoever keeping this INIT_LIST_HEAD in inode_init_once(); the cost of taking it into inode_init_always() will be negligible for pipes and sockets and negative for everything else. Not to mention the removal of boilerplate code from ->destroy_inode() instances... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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