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authorChristoph Hellwig <hch@lst.de>2015-11-13 11:38:47 +0300
committerTrond Myklebust <trond.myklebust@primarydata.com>2015-11-24 05:52:51 +0300
commit21fad313d5890b674432fe3ad0c7bcf040320340 (patch)
treecb690d66f699fe9a92d9d3b1cb6f8e6fd64005d9 /fs
parent3a2e176905b1a8d1b51cbfda719058f5ce893efd (diff)
downloadlinux-21fad313d5890b674432fe3ad0c7bcf040320340.tar.xz
nfs: allow intra-file CLONE
Originally CLONE didn't allow for intra-file clones, but we recently updated the spec to support this feature which is also supported by local Linux file systems. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/nfs/nfs4file.c19
1 files changed, 14 insertions, 5 deletions
diff --git a/fs/nfs/nfs4file.c b/fs/nfs/nfs4file.c
index e45f686a5a60..61f1c1c02d06 100644
--- a/fs/nfs/nfs4file.c
+++ b/fs/nfs/nfs4file.c
@@ -203,6 +203,7 @@ nfs42_ioctl_clone(struct file *dst_file, unsigned long srcfd,
struct fd src_file;
struct inode *src_inode;
unsigned int bs = server->clone_blksize;
+ bool same_inode = false;
int ret;
/* dst file must be opened for writing */
@@ -221,10 +222,8 @@ nfs42_ioctl_clone(struct file *dst_file, unsigned long srcfd,
src_inode = file_inode(src_file.file);
- /* src and dst must be different files */
- ret = -EINVAL;
if (src_inode == dst_inode)
- goto out_fput;
+ same_inode = true;
/* src file must be opened for reading */
if (!(src_file.file->f_mode & FMODE_READ))
@@ -249,8 +248,16 @@ nfs42_ioctl_clone(struct file *dst_file, unsigned long srcfd,
goto out_fput;
}
+ /* verify if ranges are overlapped within the same file */
+ if (same_inode) {
+ if (dst_off + count > src_off && dst_off < src_off + count)
+ goto out_fput;
+ }
+
/* XXX: do we lock at all? what if server needs CB_RECALL_LAYOUT? */
- if (dst_inode < src_inode) {
+ if (same_inode) {
+ mutex_lock(&src_inode->i_mutex);
+ } else if (dst_inode < src_inode) {
mutex_lock_nested(&dst_inode->i_mutex, I_MUTEX_PARENT);
mutex_lock_nested(&src_inode->i_mutex, I_MUTEX_CHILD);
} else {
@@ -275,7 +282,9 @@ nfs42_ioctl_clone(struct file *dst_file, unsigned long srcfd,
truncate_inode_pages_range(&dst_inode->i_data, dst_off, dst_off + count - 1);
out_unlock:
- if (dst_inode < src_inode) {
+ if (same_inode) {
+ mutex_unlock(&src_inode->i_mutex);
+ } else if (dst_inode < src_inode) {
mutex_unlock(&src_inode->i_mutex);
mutex_unlock(&dst_inode->i_mutex);
} else {