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authorLinus Torvalds <torvalds@linux-foundation.org>2014-08-11 11:44:11 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2014-08-11 11:44:11 -0700
commitf6f993328b2abcab86a3c99d7bd9f2066ab03d36 (patch)
treeea6f3902a0fa546493731b3b52a31d98cc747a90 /mm
parentc7a19c795b4b0a3232c157ed29eea85077e95da6 (diff)
parent12a5b5294cb1896e9a3c9fca8ff5a7e3def4e8c6 (diff)
downloadlinux-f6f993328b2abcab86a3c99d7bd9f2066ab03d36.tar.gz
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Pull vfs updates from Al Viro: "Stuff in here: - acct.c fixes and general rework of mnt_pin mechanism. That allows to go for delayed-mntput stuff, which will permit mntput() on deep stack without worrying about stack overflows - fs shutdown will happen on shallow stack. IOW, we can do Eric's umount-on-rmdir series without introducing tons of stack overflows on new mntput() call chains it introduces. - Bruce's d_splice_alias() patches - more Miklos' rename() stuff. - a couple of regression fixes (stable fodder, in the end of branch) and a fix for API idiocy in iov_iter.c. There definitely will be another pile, maybe even two. I'd like to get Eric's series in this time, but even if we miss it, it'll go right in the beginning of for-next in the next cycle - the tricky part of prereqs is in this pile" * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: (40 commits) fix copy_tree() regression __generic_file_write_iter(): fix handling of sync error after DIO switch iov_iter_get_pages() to passing maximal number of pages fs: mark __d_obtain_alias static dcache: d_splice_alias should detect loops exportfs: update Exporting documentation dcache: d_find_alias needn't recheck IS_ROOT && DCACHE_DISCONNECTED dcache: remove unused d_find_alias parameter dcache: d_obtain_alias callers don't all want DISCONNECTED dcache: d_splice_alias should ignore DCACHE_DISCONNECTED dcache: d_splice_alias mustn't create directory aliases dcache: close d_move race in d_splice_alias dcache: move d_splice_alias namei: trivial fix to vfs_rename_dir comment VFS: allow ->d_manage() to declare -EISDIR in rcu_walk mode. cifs: support RENAME_NOREPLACE hostfs: support rename flags shmem: support RENAME_EXCHANGE shmem: support RENAME_NOREPLACE btrfs: add RENAME_NOREPLACE ...
Diffstat (limited to 'mm')
-rw-r--r--mm/filemap.c2
-rw-r--r--mm/iov_iter.c17
-rw-r--r--mm/shmem.c32
3 files changed, 39 insertions, 12 deletions
diff --git a/mm/filemap.c b/mm/filemap.c
index f501b56ec2c6..90effcdf948d 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -2602,7 +2602,7 @@ ssize_t __generic_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
* that this differs from normal direct-io semantics, which
* will return -EFOO even if some bytes were written.
*/
- if (unlikely(status < 0) && !written) {
+ if (unlikely(status < 0)) {
err = status;
goto out;
}
diff --git a/mm/iov_iter.c b/mm/iov_iter.c
index 7b5dbd1517b5..ab88dc0ea1d3 100644
--- a/mm/iov_iter.c
+++ b/mm/iov_iter.c
@@ -310,7 +310,7 @@ void iov_iter_init(struct iov_iter *i, int direction,
EXPORT_SYMBOL(iov_iter_init);
static ssize_t get_pages_iovec(struct iov_iter *i,
- struct page **pages, size_t maxsize,
+ struct page **pages, unsigned maxpages,
size_t *start)
{
size_t offset = i->iov_offset;
@@ -323,10 +323,10 @@ static ssize_t get_pages_iovec(struct iov_iter *i,
len = iov->iov_len - offset;
if (len > i->count)
len = i->count;
- if (len > maxsize)
- len = maxsize;
addr = (unsigned long)iov->iov_base + offset;
len += *start = addr & (PAGE_SIZE - 1);
+ if (len > maxpages * PAGE_SIZE)
+ len = maxpages * PAGE_SIZE;
addr &= ~(PAGE_SIZE - 1);
n = (len + PAGE_SIZE - 1) / PAGE_SIZE;
res = get_user_pages_fast(addr, n, (i->type & WRITE) != WRITE, pages);
@@ -588,15 +588,14 @@ static unsigned long alignment_bvec(const struct iov_iter *i)
}
static ssize_t get_pages_bvec(struct iov_iter *i,
- struct page **pages, size_t maxsize,
+ struct page **pages, unsigned maxpages,
size_t *start)
{
const struct bio_vec *bvec = i->bvec;
size_t len = bvec->bv_len - i->iov_offset;
if (len > i->count)
len = i->count;
- if (len > maxsize)
- len = maxsize;
+ /* can't be more than PAGE_SIZE */
*start = bvec->bv_offset + i->iov_offset;
get_page(*pages = bvec->bv_page);
@@ -712,13 +711,13 @@ unsigned long iov_iter_alignment(const struct iov_iter *i)
EXPORT_SYMBOL(iov_iter_alignment);
ssize_t iov_iter_get_pages(struct iov_iter *i,
- struct page **pages, size_t maxsize,
+ struct page **pages, unsigned maxpages,
size_t *start)
{
if (i->type & ITER_BVEC)
- return get_pages_bvec(i, pages, maxsize, start);
+ return get_pages_bvec(i, pages, maxpages, start);
else
- return get_pages_iovec(i, pages, maxsize, start);
+ return get_pages_iovec(i, pages, maxpages, start);
}
EXPORT_SYMBOL(iov_iter_get_pages);
diff --git a/mm/shmem.c b/mm/shmem.c
index a42add14331c..0e5fb225007c 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -2323,17 +2323,45 @@ static int shmem_rmdir(struct inode *dir, struct dentry *dentry)
return shmem_unlink(dir, dentry);
}
+static int shmem_exchange(struct inode *old_dir, struct dentry *old_dentry, struct inode *new_dir, struct dentry *new_dentry)
+{
+ bool old_is_dir = S_ISDIR(old_dentry->d_inode->i_mode);
+ bool new_is_dir = S_ISDIR(new_dentry->d_inode->i_mode);
+
+ if (old_dir != new_dir && old_is_dir != new_is_dir) {
+ if (old_is_dir) {
+ drop_nlink(old_dir);
+ inc_nlink(new_dir);
+ } else {
+ drop_nlink(new_dir);
+ inc_nlink(old_dir);
+ }
+ }
+ old_dir->i_ctime = old_dir->i_mtime =
+ new_dir->i_ctime = new_dir->i_mtime =
+ old_dentry->d_inode->i_ctime =
+ new_dentry->d_inode->i_ctime = CURRENT_TIME;
+
+ return 0;
+}
+
/*
* The VFS layer already does all the dentry stuff for rename,
* we just have to decrement the usage count for the target if
* it exists so that the VFS layer correctly free's it when it
* gets overwritten.
*/
-static int shmem_rename(struct inode *old_dir, struct dentry *old_dentry, struct inode *new_dir, struct dentry *new_dentry)
+static int shmem_rename2(struct inode *old_dir, struct dentry *old_dentry, struct inode *new_dir, struct dentry *new_dentry, unsigned int flags)
{
struct inode *inode = old_dentry->d_inode;
int they_are_dirs = S_ISDIR(inode->i_mode);
+ if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE))
+ return -EINVAL;
+
+ if (flags & RENAME_EXCHANGE)
+ return shmem_exchange(old_dir, old_dentry, new_dir, new_dentry);
+
if (!simple_empty(new_dentry))
return -ENOTEMPTY;
@@ -3087,7 +3115,7 @@ static const struct inode_operations shmem_dir_inode_operations = {
.mkdir = shmem_mkdir,
.rmdir = shmem_rmdir,
.mknod = shmem_mknod,
- .rename = shmem_rename,
+ .rename2 = shmem_rename2,
.tmpfile = shmem_tmpfile,
#endif
#ifdef CONFIG_TMPFS_XATTR