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Date: Wed, 24 Sep 2014 22:04:30 +0800
From: Li Xi <pkuelelixi@...il.com>
To: linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org,
linux-api@...r.kernel.org, tytso@....edu, adilger@...ger.ca,
jack@...e.cz, viro@...iv.linux.org.uk, hch@...radead.org,
dmonakhov@...nvz.org
Subject: [PATCH 4/4] Adds ioctl interface support for ext4 project
This patch adds ioctl interface for setting/getting project of ext4.
Signed-off-by: Li Xi <lixi@....com>
---
Documentation/filesystems/ext4.txt | 4 ++
fs/ext4/ext4.h | 2 +
fs/ext4/ioctl.c | 85 ++++++++++++++++++++++++++++++++++++
3 files changed, 91 insertions(+), 0 deletions(-)
diff --git a/Documentation/filesystems/ext4.txt b/Documentation/filesystems/ext4.txt
index 919a329..9c98e62 100644
--- a/Documentation/filesystems/ext4.txt
+++ b/Documentation/filesystems/ext4.txt
@@ -609,6 +609,10 @@ EXT4_IOC_SWAP_BOOT Swap i_blocks and associated attributes
The data blocks of the previous boot loader
will be associated with the given inode.
+ EXT4_IOC_GETPROJECT Get project ID associated with inode.
+
+ EXT4_IOC_SETPROJECT Set Project ID associated with inode.
+
..............................................................................
References
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index f8be9bf..51946fd 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -617,6 +617,8 @@ enum {
#define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64)
#define EXT4_IOC_SWAP_BOOT _IO('f', 17)
#define EXT4_IOC_PRECACHE_EXTENTS _IO('f', 18)
+#define EXT4_IOC_GETPROJECT _IOR('f', 19, long)
+#define EXT4_IOC_SETPROJECT _IOW('f', 20, long)
#if defined(__KERNEL__) && defined(CONFIG_COMPAT)
/*
diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c
index 0f2252e..93b7ff4 100644
--- a/fs/ext4/ioctl.c
+++ b/fs/ext4/ioctl.c
@@ -14,6 +14,8 @@
#include <linux/compat.h>
#include <linux/mount.h>
#include <linux/file.h>
+#include <linux/quotaops.h>
+#include <linux/quota.h>
#include <asm/uaccess.h>
#include "ext4_jbd2.h"
#include "ext4.h"
@@ -611,6 +613,89 @@ resizefs_out:
case EXT4_IOC_PRECACHE_EXTENTS:
return ext4_ext_precache(inode);
+ case EXT4_IOC_GETPROJECT:
+ {
+ __u32 projid;
+
+ projid = (__u32)from_kprojid(&init_user_ns,
+ EXT4_I(inode)->i_projid);
+ return put_user(projid, (__u32 __user *) arg);
+ }
+ case EXT4_IOC_SETPROJECT:
+ {
+ __u32 projid;
+ int err;
+ handle_t *handle;
+ kprojid_t kprojid;
+ struct ext4_iloc iloc;
+ struct ext4_inode *raw_inode;
+
+ struct dquot *transfer_to[EXT4_MAXQUOTAS] = { };
+
+ /* Make sure caller can change project. */
+ if (!capable(CAP_SYS_ADMIN))
+ return -EACCES;
+
+ if (get_user(projid, (__u32 __user *) arg))
+ return -EFAULT;
+
+ kprojid = make_kprojid(&init_user_ns, (projid_t)projid);
+
+ if (projid_eq(kprojid, EXT4_I(inode)->i_projid))
+ return 0;
+
+ err = mnt_want_write_file(filp);
+ if (err)
+ return err;
+
+ err = -EPERM;
+ mutex_lock(&inode->i_mutex);
+ /* Is it quota file? Do not allow user to mess with it */
+ if (IS_NOQUOTA(inode))
+ goto project_out;
+
+ dquot_initialize(inode);
+
+ handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
+ EXT4_QUOTA_INIT_BLOCKS(sb) +
+ EXT4_QUOTA_DEL_BLOCKS(sb) + 3);
+ if (IS_ERR(handle)) {
+ err = PTR_ERR(handle);
+ goto project_out;
+ }
+
+ err = ext4_reserve_inode_write(handle, inode, &iloc);
+ if (err)
+ goto project_stop;
+
+ raw_inode = ext4_raw_inode(&iloc);
+ if ((EXT4_INODE_SIZE(inode->i_sb) <=
+ EXT4_GOOD_OLD_INODE_SIZE) ||
+ (!EXT4_FITS_IN_INODE(raw_inode, ei, i_projid))) {
+ err = -EFBIG;
+ goto project_stop;
+ }
+
+ transfer_to[PRJQUOTA] = dqget(sb, make_kqid_projid(kprojid));
+ if (!transfer_to[PRJQUOTA])
+ goto project_set;
+
+ err = __dquot_transfer(inode, transfer_to);
+ dqput(transfer_to[PRJQUOTA]);
+ if (err)
+ goto project_stop;
+
+project_set:
+ EXT4_I(inode)->i_projid = kprojid;
+ inode->i_ctime = ext4_current_time(inode);
+ err = ext4_mark_iloc_dirty(handle, inode, &iloc);
+project_stop:
+ ext4_journal_stop(handle);
+project_out:
+ mutex_unlock(&inode->i_mutex);
+ mnt_drop_write_file(filp);
+ return err;
+ }
default:
return -ENOTTY;
}
--
1.7.1
--
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