aboutsummaryrefslogtreecommitdiffstats
path: root/mm
diff options
context:
space:
mode:
authorLinus Torvalds <torvalds@linux-foundation.org>2015-04-16 23:27:56 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2015-04-16 23:27:56 -0400
commit4fc8adcfec3da639da76e8314c9ccefe5bf9a045 (patch)
treee07a2dea8acf04d8bbbecd4fd3a571653ecdd953 /mm
parent84588e7a5d8220446d677d7b909a20ee7a4496b9 (diff)
parentaa4d86163e4e91a1ac560954a554bab417e338f4 (diff)
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Pull third hunk of vfs changes from Al Viro: "This contains the ->direct_IO() changes from Omar + saner generic_write_checks() + dealing with fcntl()/{read,write}() races (mirroring O_APPEND/O_DIRECT into iocb->ki_flags and instead of repeatedly looking at ->f_flags, which can be changed by fcntl(2), check ->ki_flags - which cannot) + infrastructure bits for dhowells' d_inode annotations + Christophs switch of /dev/loop to vfs_iter_write()" * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: (30 commits) block: loop: switch to VFS ITER_BVEC configfs: Fix inconsistent use of file_inode() vs file->f_path.dentry->d_inode VFS: Make pathwalk use d_is_reg() rather than S_ISREG() VFS: Fix up debugfs to use d_is_dir() in place of S_ISDIR() VFS: Combine inode checks with d_is_negative() and d_is_positive() in pathwalk NFS: Don't use d_inode as a variable name VFS: Impose ordering on accesses of d_inode and d_flags VFS: Add owner-filesystem positive/negative dentry checks nfs: generic_write_checks() shouldn't be done on swapout... ocfs2: use __generic_file_write_iter() mirror O_APPEND and O_DIRECT into iocb->ki_flags switch generic_write_checks() to iocb and iter ocfs2: move generic_write_checks() before the alignment checks ocfs2_file_write_iter: stop messing with ppos udf_file_write_iter: reorder and simplify fuse: ->direct_IO() doesn't need generic_write_checks() ext4_file_write_iter: move generic_write_checks() up xfs_file_aio_write_checks: switch to iocb/iov_iter generic_write_checks(): drop isblk argument blkdev_write_iter: expand generic_file_checks() call in there ...
Diffstat (limited to 'mm')
-rw-r--r--mm/filemap.c114
-rw-r--r--mm/page_io.c4
2 files changed, 39 insertions, 79 deletions
diff --git a/mm/filemap.c b/mm/filemap.c
index 12548d03c11d..6bf5e42d560a 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -1693,7 +1693,7 @@ generic_file_read_iter(struct kiocb *iocb, struct iov_iter *iter)
loff_t *ppos = &iocb->ki_pos;
loff_t pos = *ppos;
- if (io_is_direct(file)) {
+ if (iocb->ki_flags & IOCB_DIRECT) {
struct address_space *mapping = file->f_mapping;
struct inode *inode = mapping->host;
size_t count = iov_iter_count(iter);
@@ -1706,7 +1706,7 @@ generic_file_read_iter(struct kiocb *iocb, struct iov_iter *iter)
pos + count - 1);
if (!retval) {
struct iov_iter data = *iter;
- retval = mapping->a_ops->direct_IO(READ, iocb, &data, pos);
+ retval = mapping->a_ops->direct_IO(iocb, &data, pos);
}
if (retval > 0) {
@@ -2259,41 +2259,38 @@ EXPORT_SYMBOL(read_cache_page_gfp);
* Returns appropriate error code that caller should return or
* zero in case that write should be allowed.
*/
-inline int generic_write_checks(struct file *file, loff_t *pos, size_t *count, int isblk)
+inline ssize_t generic_write_checks(struct kiocb *iocb, struct iov_iter *from)
{
+ struct file *file = iocb->ki_filp;
struct inode *inode = file->f_mapping->host;
unsigned long limit = rlimit(RLIMIT_FSIZE);
+ loff_t pos;
- if (unlikely(*pos < 0))
- return -EINVAL;
+ if (!iov_iter_count(from))
+ return 0;
- if (!isblk) {
- /* FIXME: this is for backwards compatibility with 2.4 */
- if (file->f_flags & O_APPEND)
- *pos = i_size_read(inode);
+ /* FIXME: this is for backwards compatibility with 2.4 */
+ if (iocb->ki_flags & IOCB_APPEND)
+ iocb->ki_pos = i_size_read(inode);
- if (limit != RLIM_INFINITY) {
- if (*pos >= limit) {
- send_sig(SIGXFSZ, current, 0);
- return -EFBIG;
- }
- if (*count > limit - (typeof(limit))*pos) {
- *count = limit - (typeof(limit))*pos;
- }
+ pos = iocb->ki_pos;
+
+ if (limit != RLIM_INFINITY) {
+ if (iocb->ki_pos >= limit) {
+ send_sig(SIGXFSZ, current, 0);
+ return -EFBIG;
}
+ iov_iter_truncate(from, limit - (unsigned long)pos);
}
/*
* LFS rule
*/
- if (unlikely(*pos + *count > MAX_NON_LFS &&
+ if (unlikely(pos + iov_iter_count(from) > MAX_NON_LFS &&
!(file->f_flags & O_LARGEFILE))) {
- if (*pos >= MAX_NON_LFS) {
+ if (pos >= MAX_NON_LFS)
return -EFBIG;
- }
- if (*count > MAX_NON_LFS - (unsigned long)*pos) {
- *count = MAX_NON_LFS - (unsigned long)*pos;
- }
+ iov_iter_truncate(from, MAX_NON_LFS - (unsigned long)pos);
}
/*
@@ -2303,34 +2300,11 @@ inline int generic_write_checks(struct file *file, loff_t *pos, size_t *count, i
* exceeded without writing data we send a signal and return EFBIG.
* Linus frestrict idea will clean these up nicely..
*/
- if (likely(!isblk)) {
- if (unlikely(*pos >= inode->i_sb->s_maxbytes)) {
- if (*count || *pos > inode->i_sb->s_maxbytes) {
- return -EFBIG;
- }
- /* zero-length writes at ->s_maxbytes are OK */
- }
+ if (unlikely(pos >= inode->i_sb->s_maxbytes))
+ return -EFBIG;
- if (unlikely(*pos + *count > inode->i_sb->s_maxbytes))
- *count = inode->i_sb->s_maxbytes - *pos;
- } else {
-#ifdef CONFIG_BLOCK
- loff_t isize;
- if (bdev_read_only(I_BDEV(inode)))
- return -EPERM;
- isize = i_size_read(inode);
- if (*pos >= isize) {
- if (*count || *pos > isize)
- return -ENOSPC;
- }
-
- if (*pos + *count > isize)
- *count = isize - *pos;
-#else
- return -EPERM;
-#endif
- }
- return 0;
+ iov_iter_truncate(from, inode->i_sb->s_maxbytes - pos);
+ return iov_iter_count(from);
}
EXPORT_SYMBOL(generic_write_checks);
@@ -2394,7 +2368,7 @@ generic_file_direct_write(struct kiocb *iocb, struct iov_iter *from, loff_t pos)
}
data = *from;
- written = mapping->a_ops->direct_IO(WRITE, iocb, &data, pos);
+ written = mapping->a_ops->direct_IO(iocb, &data, pos);
/*
* Finally, try again to invalidate clean pages which might have been
@@ -2556,23 +2530,12 @@ ssize_t __generic_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
struct file *file = iocb->ki_filp;
struct address_space * mapping = file->f_mapping;
struct inode *inode = mapping->host;
- loff_t pos = iocb->ki_pos;
ssize_t written = 0;
ssize_t err;
ssize_t status;
- size_t count = iov_iter_count(from);
/* We can write back this queue in page reclaim */
current->backing_dev_info = inode_to_bdi(inode);
- err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode));
- if (err)
- goto out;
-
- if (count == 0)
- goto out;
-
- iov_iter_truncate(from, count);
-
err = file_remove_suid(file);
if (err)
goto out;
@@ -2581,10 +2544,10 @@ ssize_t __generic_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
if (err)
goto out;
- if (io_is_direct(file)) {
- loff_t endbyte;
+ if (iocb->ki_flags & IOCB_DIRECT) {
+ loff_t pos, endbyte;
- written = generic_file_direct_write(iocb, from, pos);
+ written = generic_file_direct_write(iocb, from, iocb->ki_pos);
/*
* If the write stopped short of completing, fall back to
* buffered writes. Some filesystems do this for writes to
@@ -2592,13 +2555,10 @@ ssize_t __generic_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
* not succeed (even if it did, DAX does not handle dirty
* page-cache pages correctly).
*/
- if (written < 0 || written == count || IS_DAX(inode))
+ if (written < 0 || !iov_iter_count(from) || IS_DAX(inode))
goto out;
- pos += written;
- count -= written;
-
- status = generic_perform_write(file, from, pos);
+ status = generic_perform_write(file, from, pos = iocb->ki_pos);
/*
* If generic_perform_write() returned a synchronous error
* then we want to return the number of bytes which were
@@ -2610,15 +2570,15 @@ ssize_t __generic_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
err = status;
goto out;
}
- iocb->ki_pos = pos + status;
/*
* We need to ensure that the page cache pages are written to
* disk and invalidated to preserve the expected O_DIRECT
* semantics.
*/
endbyte = pos + status - 1;
- err = filemap_write_and_wait_range(file->f_mapping, pos, endbyte);
+ err = filemap_write_and_wait_range(mapping, pos, endbyte);
if (err == 0) {
+ iocb->ki_pos = endbyte + 1;
written += status;
invalidate_mapping_pages(mapping,
pos >> PAGE_CACHE_SHIFT,
@@ -2630,9 +2590,9 @@ ssize_t __generic_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
*/
}
} else {
- written = generic_perform_write(file, from, pos);
- if (likely(written >= 0))
- iocb->ki_pos = pos + written;
+ written = generic_perform_write(file, from, iocb->ki_pos);
+ if (likely(written > 0))
+ iocb->ki_pos += written;
}
out:
current->backing_dev_info = NULL;
@@ -2656,7 +2616,9 @@ ssize_t generic_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
ssize_t ret;
mutex_lock(&inode->i_mutex);
- ret = __generic_file_write_iter(iocb, from);
+ ret = generic_write_checks(iocb, from);
+ if (ret > 0)
+ ret = __generic_file_write_iter(iocb, from);
mutex_unlock(&inode->i_mutex);
if (ret > 0) {
diff --git a/mm/page_io.c b/mm/page_io.c
index a96c8562d835..6424869e275e 100644
--- a/mm/page_io.c
+++ b/mm/page_io.c
@@ -277,9 +277,7 @@ int __swap_writepage(struct page *page, struct writeback_control *wbc,
set_page_writeback(page);
unlock_page(page);
- ret = mapping->a_ops->direct_IO(ITER_BVEC | WRITE,
- &kiocb, &from,
- kiocb.ki_pos);
+ ret = mapping->a_ops->direct_IO(&kiocb, &from, kiocb.ki_pos);
if (ret == PAGE_SIZE) {
count_vm_event(PSWPOUT);
ret = 0;

Privacy Policy