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ntfs3: Provide a splice-read wrapper

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Provide a splice_read wrapper for NTFS3 to perform various checks before
allowing the operation to proceed.

Signed-off-by: David Howells <dhowells@redhat.com>
cc: Christoph Hellwig <hch@lst.de>
cc: Al Viro <viro@zeniv.linux.org.uk>
cc: Jens Axboe <axboe@kernel.dk>
cc: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>
cc: ntfs3@lists.linux.dev
cc: linux-fsdevel@vger.kernel.org
cc: linux-block@vger.kernel.org
cc: linux-mm@kvack.org
Link: https://lore.kernel.org/r/20230522135018.2742245-22-dhowells@redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
David Howells 2023-05-22 14:50:08 +01:00 committed by Jens Axboe
parent a7db503401
commit 5149439880
1 changed files with 30 additions and 1 deletions
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31
fs/ntfs3/file.c
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@ -744,6 +744,35 @@ static ssize_t ntfs_file_read_iter(struct kiocb *iocb, struct iov_iter *iter)
return generic_file_read_iter(iocb, iter);
}
static ssize_t ntfs_file_splice_read(struct file *in, loff_t *ppos,
struct pipe_inode_info *pipe,
size_t len, unsigned int flags)
{
struct inode *inode = in->f_mapping->host;
struct ntfs_inode *ni = ntfs_i(inode);
if (is_encrypted(ni)) {
ntfs_inode_warn(inode, "encrypted i/o not supported");
return -EOPNOTSUPP;
}
#ifndef CONFIG_NTFS3_LZX_XPRESS
if (ni->ni_flags & NI_FLAG_COMPRESSED_MASK) {
ntfs_inode_warn(
inode,
"activate CONFIG_NTFS3_LZX_XPRESS to read external compressed files");
return -EOPNOTSUPP;
}
#endif
if (is_dedup(ni)) {
ntfs_inode_warn(inode, "read deduplicated not supported");
return -EOPNOTSUPP;
}
return generic_file_splice_read(in, ppos, pipe, len, flags);
}
/*
* ntfs_get_frame_pages
*
@ -1159,7 +1188,7 @@ const struct file_operations ntfs_file_operations = {
#ifdef CONFIG_COMPAT
.compat_ioctl = ntfs_compat_ioctl,
#endif
.splice_read = generic_file_splice_read,
.splice_read = ntfs_file_splice_read,
.mmap = ntfs_file_mmap,
.open = ntfs_file_open,
.fsync = generic_file_fsync,