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vfs: call vfs_clone_file_range() under freeze protection 

Move sb_start_write()/sb_end_write() out of the vfs helper and up into the
ioctl handler.

Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Amir Goldstein 2016-09-23 11:38:11 +03:00 committed by Miklos Szeredi
parent 913b86e92e
commit 031a072a0b
4 changed files with 15 additions and 6 deletions
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2
fs/ioctl.c
View File

@ -226,7 +226,7 @@ static long ioctl_file_clone(struct file *dst_file, unsigned long srcfd,
ret = -EXDEV;
if (src_file.file->f_path.mnt != dst_file->f_path.mnt)
goto fdput;
ret = vfs_clone_file_range(src_file.file, off, dst_file, destoff, olen);
ret = do_clone_file_range(src_file.file, off, dst_file, destoff, olen);
fdput:
fdput(src_file);
return ret;

3
fs/nfsd/vfs.c
View File

@ -509,8 +509,7 @@ __be32 nfsd4_set_nfs4_label(struct svc_rqst *rqstp, struct svc_fh *fhp,
__be32 nfsd4_clone_file_range(struct file *src, u64 src_pos, struct file *dst,
u64 dst_pos, u64 count)
{
return nfserrno(vfs_clone_file_range(src, src_pos, dst, dst_pos,
count));
return nfserrno(do_clone_file_range(src, src_pos, dst, dst_pos, count));
}
ssize_t nfsd_copy_file_range(struct file *src, u64 src_pos, struct file *dst,

3
fs/read_write.c
View File

@ -1687,8 +1687,6 @@ int vfs_clone_file_range(struct file *file_in, loff_t pos_in,
if (pos_in + len > i_size_read(inode_in))
return -EINVAL;
sb_start_write(inode_out->i_sb);
ret = file_in->f_op->clone_file_range(file_in, pos_in,
file_out, pos_out, len);
if (!ret) {
@ -1696,7 +1694,6 @@ int vfs_clone_file_range(struct file *file_in, loff_t pos_in,
fsnotify_modify(file_out);
}
sb_end_write(inode_out->i_sb);
return ret;
}
EXPORT_SYMBOL(vfs_clone_file_range);

13
include/linux/fs.h
View File

@ -1783,6 +1783,19 @@ extern int vfs_clone_file_range(struct file *file_in, loff_t pos_in,
extern int vfs_dedupe_file_range(struct file *file,
struct file_dedupe_range *same);
static inline int do_clone_file_range(struct file *file_in, loff_t pos_in,
struct file *file_out, loff_t pos_out,
u64 len)
{
int ret;
sb_start_write(file_inode(file_out)->i_sb);
ret = vfs_clone_file_range(file_in, pos_in, file_out, pos_out, len);
sb_end_write(file_inode(file_out)->i_sb);
return ret;
}
struct super_operations {
struct inode *(*alloc_inode)(struct super_block *sb);
void (*destroy_inode)(struct inode *);