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vfs: wrap write f_ops with file_{start,end}_write() 

Before calling write f_ops, call file_start_write() instead
of sb_start_write().

Replace {sb,file}_start_write() for {copy,clone}_file_range() and
for fallocate().

Beyond correct semantics, this avoids freeze protection to sb when
operating on special inodes, such as fallocate() on a blockdev.

Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
zero-colors
Amir Goldstein 2017-01-31 10:34:57 +02:00 committed by Miklos Szeredi
parent 11cbfb1077
commit bfe219d373
3 changed files with 17 additions and 17 deletions
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4
fs/open.c
View File

@ -314,7 +314,7 @@ int vfs_fallocate(struct file *file, int mode, loff_t offset, loff_t len)
if (!file->f_op->fallocate)
return -EOPNOTSUPP;
sb_start_write(inode->i_sb);
file_start_write(file);
ret = file->f_op->fallocate(file, mode, offset, len);
/*
@ -327,7 +327,7 @@ int vfs_fallocate(struct file *file, int mode, loff_t offset, loff_t len)
if (ret == 0)
fsnotify_modify(file);
sb_end_write(inode->i_sb);
file_end_write(file);
return ret;
}
EXPORT_SYMBOL_GPL(vfs_fallocate);

4
fs/read_write.c
View File

@ -1543,7 +1543,7 @@ ssize_t vfs_copy_file_range(struct file *file_in, loff_t pos_in,
if (len == 0)
return 0;
sb_start_write(inode_out->i_sb);
file_start_write(file_out);
/*
* Try cloning first, this is supported by more file systems, and
@ -1579,7 +1579,7 @@ done:
inc_syscr(current);
inc_syscw(current);
sb_end_write(inode_out->i_sb);
file_end_write(file_out);
return ret;
}

26
include/linux/fs.h
View File

@ -1741,19 +1741,6 @@ extern int vfs_dedupe_file_range_compare(struct inode *src, loff_t srcoff,
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 *);
@ -2564,6 +2551,19 @@ static inline void file_end_write(struct file *file)
__sb_end_write(file_inode(file)->i_sb, SB_FREEZE_WRITE);
}
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;
file_start_write(file_out);
ret = vfs_clone_file_range(file_in, pos_in, file_out, pos_out, len);
file_end_write(file_out);
return ret;
}
/*
* get_write_access() gets write permission for a file.
* put_write_access() releases this write permission.