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2015-04-15VFS: security/: d_inode() annotationsDavid Howells4-12/+12
... except where that code acts as a filesystem driver, rather than working with dentries given to it. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2015-04-15VFS: security/: d_backing_inode() annotationsDavid Howells12-105/+105
most of the ->d_inode uses there refer to the same inode IO would go to, i.e. d_backing_inode() Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2015-04-15VFS: net/: d_inode() annotationsDavid Howells2-19/+19
socket inodes and sunrpc filesystems - inodes owned by that code Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2015-04-15VFS: net/unix: d_backing_inode() annotationsDavid Howells2-4/+4
places where we are dealing with S_ISSOCK file creation/lookups. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2015-04-15VFS: kernel/: d_inode() annotationsDavid Howells4-9/+9
relayfs and tracefs are dealing with inodes of their own; those two act as filesystem drivers Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2015-04-15VFS: audit: d_backing_inode() annotationsDavid Howells4-13/+13
Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2015-04-15VFS: Fix up some ->d_inode accesses in the chelsio driverDavid Howells2-16/+7
Fix up some ->d_inode accesses in the chelsio driver. (1) FILE_DATA() should just be replaced with file_inode(). (2) set_debugfs_file_size() should be removed and debugfs_create_file_size() should be used to create the file. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2015-04-15VFS: Cachefiles should perform fs modifications on the top layer onlyDavid Howells2-28/+28
Cachefiles should perform fs modifications (eg. vfs_unlink()) on the top layer only and should not attempt to alter the lower layer. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2015-04-15VFS: AF_UNIX sockets should call mknod on the top layer onlyDavid Howells1-1/+1
AF_UNIX sockets should call mknod on the top layer only and should not attempt to modify the lower layer in a layered filesystem such as overlayfs. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2015-04-15block: loop: switch to VFS ITER_BVECChristoph Hellwig1-174/+120
Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2015-04-15configfs: Fix inconsistent use of file_inode() vs file->f_path.dentry->d_inodeDavid Howells1-1/+1
Fix inconsistent use of file_inode() vs file->f_path.dentry->d_inode. Reported-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2015-04-15VFS: Make pathwalk use d_is_reg() rather than S_ISREG()David Howells1-1/+1
Make pathwalk use d_is_reg() rather than S_ISREG() to determine whether to honour O_TRUNC. Since this occurs after complete_walk(), the dentry type field cannot change and the inode pointer cannot change as we hold a ref on the dentry, so this should be safe. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2015-04-15VFS: Fix up debugfs to use d_is_dir() in place of S_ISDIR()David Howells1-1/+1
Fix up debugfs to use d_is_dir(dentry) in place of S_ISDIR(dentry->d_inode->i_mode). Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2015-04-15VFS: Combine inode checks with d_is_negative() and d_is_positive() in pathwalkDavid Howells1-3/+3
Where we have: if (!dentry->d_inode || d_is_negative(dentry)) { type constructions in pathwalk we should be able to eliminate the check of d_inode and rely solely on the result of d_is_negative() or d_is_positive(). What we do have to take care to do is to read d_inode after calling a d_is_xxx() typecheck function to get the barriering right. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2015-04-15NFS: Don't use d_inode as a variable nameDavid Howells1-4/+4
Don't use d_inode as a variable name as it now masks a function name. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2015-04-15VFS: Impose ordering on accesses of d_inode and d_flagsDavid Howells2-26/+42
Impose ordering on accesses of d_inode and d_flags to avoid the need to do this: if (!dentry->d_inode || d_is_negative(dentry)) { when this: if (d_is_negative(dentry)) { should suffice. This check is especially problematic if a dentry can have its type field set to something other than DENTRY_MISS_TYPE when d_inode is NULL (as in unionmount). What we really need to do is stick a write barrier between setting d_inode and setting d_flags and a read barrier between reading d_flags and reading d_inode. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2015-04-15VFS: Add owner-filesystem positive/negative dentry checksDavid Howells1-0/+38
Supply two functions to test whether a filesystem's own dentries are positive or negative (d_really_is_positive() and d_really_is_negative()). The problem is that the DCACHE_ENTRY_TYPE field of dentry->d_flags may be overridden by the union part of a layered filesystem and isn't thus necessarily indicative of the type of dentry. Normally, this would involve a negative dentry (ie. ->d_inode == NULL) having ->d_layer.lower pointed to a lower layer dentry, DCACHE_PINNING_LOWER set and the DCACHE_ENTRY_TYPE field set to something other than DCACHE_MISS_TYPE - but it could also involve, say, a DCACHE_SPECIAL_TYPE being overridden to DCACHE_WHITEOUT_TYPE if a 0,0 chardev is detected in the top layer. However, inside a filesystem, when that fs is looking at its own dentries, it probably wants to know if they are really negative or not - and doesn't care about the fallthrough bits used by the union. To this end, a filesystem should normally use d_really_is_positive/negative() when looking at its own dentries rather than d_is_positive/negative() and should use d_inode() to get at the inode. Anyone looking at someone else's dentries (this includes pathwalk) should use d_is_xxx() and d_backing_inode(). Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2015-04-15nfs: generic_write_checks() shouldn't be done on swapout...Al Viro3-15/+11
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2015-04-12ocfs2: use __generic_file_write_iter()Al Viro1-57/+7
we can do that now - all we need is to clear IOCB_DIRECT from ->ki_flags in "can't do dio" case. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2015-04-12mirror O_APPEND and O_DIRECT into iocb->ki_flagsAl Viro11-23/+38
... avoiding write_iter/fcntl races. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2015-04-12switch generic_write_checks() to iocb and iterAl Viro14-166/+99
... returning -E... upon error and amount of data left in iter after (possible) truncation upon success. Note, that normal case gives a non-zero (positive) return value, so any tests for != 0 _must_ be updated. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Conflicts: fs/ext4/file.c
2015-04-12ocfs2: move generic_write_checks() before the alignment checksAl Viro1-24/+18
Alignment checks for dio depend upon the range truncation done by generic_write_checks(). They can be done as soon as we got ocfs2_rw_lock() and that actually makes ocfs2_prepare_inode_for_write() simpler. The only thing to watch out for is restoring the original count in "unlock and redo without dio" case. Position doesn't need to be restored, since we change it only in O_APPEND case and in that case it will be reassigned anyway. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2015-04-12ocfs2_file_write_iter: stop messing with pposAl Viro1-12/+12
it's &iocb->ki_pos; no need to obfuscate. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2015-04-12Merge branch 'for-linus' into for-nextAl Viro4-15/+34
2015-04-12udf_file_write_iter: reorder and simplifyAl Viro1-20/+14
it's easier to do generic_write_checks() first Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2015-04-12fuse: ->direct_IO() doesn't need generic_write_checks()Al Viro1-8/+3
already done by caller. We used to call __fuse_direct_write(), which called generic_write_checks(); now the former got expanded, bringing the latter to the surface. It used to be called all along and calling it from there had been wrong all along... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2015-04-12ext4_file_write_iter: move generic_write_checks() upAl Viro1-19/+20
simpler that way... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2015-04-12xfs_file_aio_write_checks: switch to iocb/iov_iterAl Viro1-15/+16
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2015-04-12generic_write_checks(): drop isblk argumentAl Viro14-60/+36
all remaining callers are passing 0; some just obscure that fact. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2015-04-12blkdev_write_iter: expand generic_file_checks() call in thereAl Viro1-6/+9
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2015-04-12lift generic_write_checks() into callers of __generic_file_write_iter()Al Viro5-30/+60
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2015-04-12__generic_file_write_iter: keep ->ki_pos and return value consistentAl Viro1-14/+10
A side effect worth noting: in O_APPEND case we set ->ki_pos early, so if it turns out to be an error or a zero-length write, we'll end up with ->ki_pos modified. Safe, since all callers never look at the ->ki_pos after the call of __generic_file_write_iter() returning non-positive, all the way to caller of ->write_iter() and those discard ->ki_pos when getting that. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2015-04-12cifs: fold cifs_iovec_write() into the only callerAl Viro1-31/+16
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2015-04-12ntfs: move iov_iter_truncate() closer to generic_write_checks()Al Viro1-52/+29
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2015-04-12new_sync_write(): discard ->ki_pos unless the return value is positiveAl Viro1-1/+2
That allows ->write_iter() instances much more convenient life wrt iocb->ki_pos (and fixes several filesystems with borderline POSIX violations when zero-length write succeeds and changes the current position). Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2015-04-12direct_IO: remove rw from a_ops->direct_IO()Omar Sandoval31-59/+42
Now that no one is using rw, remove it completely. Signed-off-by: Omar Sandoval <osandov@osandov.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2015-04-12direct_IO: use iov_iter_rw() instead of rw everywhereOmar Sandoval22-69/+69
The rw parameter to direct_IO is redundant with iov_iter->type, and treated slightly differently just about everywhere it's used: some users do rw & WRITE, and others do rw == WRITE where they should be doing a bitwise check. Simplify this with the new iov_iter_rw() helper, which always returns either READ or WRITE. Signed-off-by: Omar Sandoval <osandov@osandov.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2015-04-12Remove rw from dax_{do_,}io()Omar Sandoval5-21/+20
And use iov_iter_rw() instead. Signed-off-by: Omar Sandoval <osandov@osandov.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2015-04-12Remove rw from {,__,do_}blockdev_direct_IO()Omar Sandoval20-74/+67
Most filesystems call through to these at some point, so we'll start here. Signed-off-by: Omar Sandoval <osandov@osandov.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2015-04-12new helper: iov_iter_rw()Omar Sandoval1-0/+8
Get either READ or WRITE out of iter->type. Signed-off-by: Omar Sandoval <osandov@osandov.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2015-04-12->aio_read and ->aio_write removedAl Viro8-54/+9
no remaining users Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2015-04-12pcm: another weird API abuseAl Viro1-19/+20
readv() and writev() should _not_ ignore all but the first ->iov_len, among other things. Really weird abuse of those syscalls - it expects a vector element per channel, with identical lengths (it actually assumes them to be identical - no checking is done). readv() and writev() are really bad match for that. Unfortunately, userland API is userland API and we can't do anything about them. Converted to ->read_iter/->write_iter. Please, _please_ don't do anything of that kind when designing new interfaces. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2015-04-12infinibad: weird APIs switched to ->write_iter()Al Viro2-15/+23
Things Not To Do When Writing A Driver, part 1001st: have writev() and write() on the same file doing completely different things. As in, "interpret very different sets of commands". We _can_ handle that, but it's a bloody bad idea. Don't do that in new drivers. Ever. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2015-04-12kill do_sync_read/do_sync_writeAl Viro2-40/+0
all remaining instances of aio_{read,write} (all 4 of them) have explicit ->read and ->write resp.; do_sync_read/do_sync_write is never called by __vfs_read/__vfs_write anymore and no other users had been left. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2015-04-12fuse: use iov_iter_get_pages() for non-splice pathAl Viro1-24/+17
store reference to iter instead of that to iovec Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2015-04-12fuse: switch to ->read_iter/->write_iterAl Viro1-12/+14
we just change the calling conventions here; more work to follow. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2015-04-12switch drivers/char/mem.c to ->read_iter/->write_iterAl Viro1-9/+9
Note that _these_ guys have ->read() and ->write() left in place - they are eqiuvalent to what we'd get if we replaced those with NULL, but we are talking about hot paths here. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2015-04-12make new_sync_{read,write}() staticAl Viro59-153/+11
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>
2015-04-12coredump: accept any write methodAl Viro1-1/+1
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2015-04-12switch /dev/loop to vfs_iter_write()Al Viro1-5/+7
all writable files that might be used as backing store for /dev/loop already support ->write_iter() Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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