linux-kernel - [RFC 07/18] limits: track RLIMIT

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Date:	Mon, 13 Jun 2016 22:44:14 +0300
From:	Topi Miettinen <toiwoton@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	Topi Miettinen <toiwoton@...il.com>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jan Kara <jack@...e.cz>, Johannes Weiner <hannes@...xchg.org>,
	Michal Hocko <mhocko@...e.com>,
	Ross Zwisler <ross.zwisler@...ux.intel.com>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Mel Gorman <mgorman@...hsingularity.net>,
	Junichi Nomura <j-nomura@...jp.nec.com>,
	Matthew Wilcox <willy@...ux.intel.com>,
	linux-fsdevel@...r.kernel.org (open list:FILESYSTEMS (VFS and
	infrastructure)), linux-mm@...ck.org (open list:MEMORY MANAGEMENT)
Subject: [RFC 07/18] limits: track RLIMIT_FSIZE actual max

Track maximum file size, presented in /proc/self/limits.

Signed-off-by: Topi Miettinen <toiwoton@...il.com>
---
 fs/attr.c    | 2 ++
 mm/filemap.c | 1 +
 2 files changed, 3 insertions(+)

diff --git a/fs/attr.c b/fs/attr.c
index 25b24d0..1b620f7 100644
--- a/fs/attr.c
+++ b/fs/attr.c
@@ -116,6 +116,8 @@ int inode_newsize_ok(const struct inode *inode, loff_t offset)
 			return -ETXTBSY;
 	}
 
+	bump_rlimit(RLIMIT_FSIZE, offset);
+
 	return 0;
 out_sig:
 	send_sig(SIGXFSZ, current, 0);
diff --git a/mm/filemap.c b/mm/filemap.c
index 00ae878..1fa9864 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -2447,6 +2447,7 @@ inline ssize_t generic_write_checks(struct kiocb *iocb, struct iov_iter *from)
 			send_sig(SIGXFSZ, current, 0);
 			return -EFBIG;
 		}
+		bump_rlimit(RLIMIT_FSIZE, iocb->ki_pos);
 		iov_iter_truncate(from, limit - (unsigned long)pos);
 	}
 
-- 
2.8.1