Commit 9b7365fc authored by Li Xi's avatar Li Xi Committed by Theodore Ts'o
Browse files

ext4: add FS_IOC_FSSETXATTR/FS_IOC_FSGETXATTR interface support 



This patch adds FS_IOC_FSSETXATTR/FS_IOC_FSGETXATTR ioctl interface
support for ext4. The interface is kept consistent with
XFS_IOC_FSGETXATTR/XFS_IOC_FSGETXATTR.

Signed-off-by: default avatarLi Xi <lixi@ddn.com>
Signed-off-by: default avatarTheodore Ts'o <tytso@mit.edu>
Reviewed-by: default avatarAndreas Dilger <adilger@dilger.ca>
Reviewed-by: default avatarJan Kara <jack@suse.cz>
parent 689c958c

fs/ext4/ext4.h

+47 −0
Original line number Diff line number Diff line
@@ -381,6 +381,13 @@ struct flex_groups { 
#define EXT4_FL_USER_VISIBLE		0x304BDFFF /* User visible flags */

#define EXT4_FL_USER_MODIFIABLE		0x204380FF /* User modifiable flags */



#define EXT4_FL_XFLAG_VISIBLE		(EXT4_SYNC_FL | \

					 EXT4_IMMUTABLE_FL | \

					 EXT4_APPEND_FL | \

					 EXT4_NODUMP_FL | \

					 EXT4_NOATIME_FL | \

					 EXT4_PROJINHERIT_FL)



/* Flags that should be inherited by new inodes from their parent. */

#define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\

			   EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
@@ -619,6 +626,46 @@ enum { 
#define EXT4_IOC_GET_ENCRYPTION_PWSALT	_IOW('f', 20, __u8[16])

#define EXT4_IOC_GET_ENCRYPTION_POLICY	_IOW('f', 21, struct ext4_encryption_policy)



#ifndef FS_IOC_FSGETXATTR

/* Until the uapi changes get merged for project quota... */



#define FS_IOC_FSGETXATTR		_IOR('X', 31, struct fsxattr)

#define FS_IOC_FSSETXATTR		_IOW('X', 32, struct fsxattr)



/*

 * Structure for FS_IOC_FSGETXATTR and FS_IOC_FSSETXATTR.

 */

struct fsxattr {

	__u32		fsx_xflags;	/* xflags field value (get/set) */

	__u32		fsx_extsize;	/* extsize field value (get/set)*/

	__u32		fsx_nextents;	/* nextents field value (get)	*/

	__u32		fsx_projid;	/* project identifier (get/set) */

	unsigned char	fsx_pad[12];

};



/*

 * Flags for the fsx_xflags field

 */

#define FS_XFLAG_REALTIME	0x00000001	/* data in realtime volume */

#define FS_XFLAG_PREALLOC	0x00000002	/* preallocated file extents */

#define FS_XFLAG_IMMUTABLE	0x00000008	/* file cannot be modified */

#define FS_XFLAG_APPEND		0x00000010	/* all writes append */

#define FS_XFLAG_SYNC		0x00000020	/* all writes synchronous */

#define FS_XFLAG_NOATIME	0x00000040	/* do not update access time */

#define FS_XFLAG_NODUMP		0x00000080	/* do not include in backups */

#define FS_XFLAG_RTINHERIT	0x00000100	/* create with rt bit set */

#define FS_XFLAG_PROJINHERIT	0x00000200	/* create with parents projid */

#define FS_XFLAG_NOSYMLINKS	0x00000400	/* disallow symlink creation */

#define FS_XFLAG_EXTSIZE	0x00000800	/* extent size allocator hint */

#define FS_XFLAG_EXTSZINHERIT	0x00001000	/* inherit inode extent size */

#define FS_XFLAG_NODEFRAG	0x00002000  	/* do not defragment */

#define FS_XFLAG_FILESTREAM	0x00004000	/* use filestream allocator */

#define FS_XFLAG_HASATTR	0x80000000	/* no DIFLAG for this */

#endif /* !defined(FS_IOC_FSGETXATTR) */



#define EXT4_IOC_FSGETXATTR		FS_IOC_FSGETXATTR

#define EXT4_IOC_FSSETXATTR		FS_IOC_FSSETXATTR



#if defined(__KERNEL__) && defined(CONFIG_COMPAT)

/*

 * ioctl commands in 32 bit emulation

fs/ext4/ioctl.c

+289 −87
Original line number Diff line number Diff line
@@ -14,6 +14,7 @@ 
#include <linux/mount.h>

#include <linux/file.h>

#include <linux/random.h>

#include <linux/quotaops.h>

#include <asm/uaccess.h>

#include "ext4_jbd2.h"

#include "ext4.h"
@@ -202,41 +203,16 @@ static int uuid_is_zero(__u8 u[16]) 
	return 1;

}



long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)

static int ext4_ioctl_setflags(struct inode *inode,

			       unsigned int flags)

{

	struct inode *inode = file_inode(filp);

	struct super_block *sb = inode->i_sb;

	struct ext4_inode_info *ei = EXT4_I(inode);

	unsigned int flags;



	ext4_debug("cmd = %u, arg = %lu\n", cmd, arg);



	switch (cmd) {

	case EXT4_IOC_GETFLAGS:

		ext4_get_inode_flags(ei);

		flags = ei->i_flags & EXT4_FL_USER_VISIBLE;

		return put_user(flags, (int __user *) arg);

	case EXT4_IOC_SETFLAGS: {

	handle_t *handle = NULL;

		int err, migrate = 0;

	int err = EPERM, migrate = 0;

	struct ext4_iloc iloc;

	unsigned int oldflags, mask, i;

	unsigned int jflag;



		if (!inode_owner_or_capable(inode))

			return -EACCES;



		if (get_user(flags, (int __user *) arg))

			return -EFAULT;



		err = mnt_want_write_file(filp);

		if (err)

			return err;



		flags = ext4_mask_flags(inode->i_mode, flags);



		err = -EPERM;

		mutex_lock(&inode->i_mutex);

	/* Is it quota file? Do not allow user to mess with it */

	if (IS_NOQUOTA(inode))

		goto flags_out;
@@ -318,6 +294,178 @@ flags_err: 
	}



flags_out:

	return err;

}



#ifdef CONFIG_QUOTA

static int ext4_ioctl_setproject(struct file *filp, __u32 projid)

{

	struct inode *inode = file_inode(filp);

	struct super_block *sb = inode->i_sb;

	struct ext4_inode_info *ei = EXT4_I(inode);

	int err, rc;

	handle_t *handle;

	kprojid_t kprojid;

	struct ext4_iloc iloc;

	struct ext4_inode *raw_inode;



	if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,

			EXT4_FEATURE_RO_COMPAT_PROJECT)) {

		if (projid != EXT4_DEF_PROJID)

			return -EOPNOTSUPP;

		else

			return 0;

	}



	if (EXT4_INODE_SIZE(sb) <= EXT4_GOOD_OLD_INODE_SIZE)

		return -EOPNOTSUPP;



	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 out_unlock;



	err = ext4_get_inode_loc(inode, &iloc);

	if (err)

		goto out_unlock;



	raw_inode = ext4_raw_inode(&iloc);

	if (!EXT4_FITS_IN_INODE(raw_inode, ei, i_projid)) {

		err = -EOVERFLOW;

		brelse(iloc.bh);

		goto out_unlock;

	}

	brelse(iloc.bh);



	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 out_unlock;

	}



	err = ext4_reserve_inode_write(handle, inode, &iloc);

	if (err)

		goto out_stop;



	if (sb_has_quota_limits_enabled(sb, PRJQUOTA)) {

		struct dquot *transfer_to[MAXQUOTAS] = { };



		transfer_to[PRJQUOTA] = dqget(sb, make_kqid_projid(kprojid));

		if (transfer_to[PRJQUOTA]) {

			err = __dquot_transfer(inode, transfer_to);

			dqput(transfer_to[PRJQUOTA]);

			if (err)

				goto out_dirty;

		}

	}

	EXT4_I(inode)->i_projid = kprojid;

	inode->i_ctime = ext4_current_time(inode);

out_dirty:

	rc = ext4_mark_iloc_dirty(handle, inode, &iloc);

	if (!err)

		err = rc;

out_stop:

	ext4_journal_stop(handle);

out_unlock:

	mutex_unlock(&inode->i_mutex);

	mnt_drop_write_file(filp);

	return err;

}

#else

static int ext4_ioctl_setproject(struct file *filp, __u32 projid)

{

	if (projid != EXT4_DEF_PROJID)

		return -EOPNOTSUPP;

	return 0;

}

#endif



/* Transfer internal flags to xflags */

static inline __u32 ext4_iflags_to_xflags(unsigned long iflags)

{

	__u32 xflags = 0;



	if (iflags & EXT4_SYNC_FL)

		xflags |= FS_XFLAG_SYNC;

	if (iflags & EXT4_IMMUTABLE_FL)

		xflags |= FS_XFLAG_IMMUTABLE;

	if (iflags & EXT4_APPEND_FL)

		xflags |= FS_XFLAG_APPEND;

	if (iflags & EXT4_NODUMP_FL)

		xflags |= FS_XFLAG_NODUMP;

	if (iflags & EXT4_NOATIME_FL)

		xflags |= FS_XFLAG_NOATIME;

	if (iflags & EXT4_PROJINHERIT_FL)

		xflags |= FS_XFLAG_PROJINHERIT;

	return xflags;

}



/* Transfer xflags flags to internal */

static inline unsigned long ext4_xflags_to_iflags(__u32 xflags)

{

	unsigned long iflags = 0;



	if (xflags & FS_XFLAG_SYNC)

		iflags |= EXT4_SYNC_FL;

	if (xflags & FS_XFLAG_IMMUTABLE)

		iflags |= EXT4_IMMUTABLE_FL;

	if (xflags & FS_XFLAG_APPEND)

		iflags |= EXT4_APPEND_FL;

	if (xflags & FS_XFLAG_NODUMP)

		iflags |= EXT4_NODUMP_FL;

	if (xflags & FS_XFLAG_NOATIME)

		iflags |= EXT4_NOATIME_FL;

	if (xflags & FS_XFLAG_PROJINHERIT)

		iflags |= EXT4_PROJINHERIT_FL;



	return iflags;

}



long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)

{

	struct inode *inode = file_inode(filp);

	struct super_block *sb = inode->i_sb;

	struct ext4_inode_info *ei = EXT4_I(inode);

	unsigned int flags;



	ext4_debug("cmd = %u, arg = %lu\n", cmd, arg);



	switch (cmd) {

	case EXT4_IOC_GETFLAGS:

		ext4_get_inode_flags(ei);

		flags = ei->i_flags & EXT4_FL_USER_VISIBLE;

		return put_user(flags, (int __user *) arg);

	case EXT4_IOC_SETFLAGS: {

		int err;



		if (!inode_owner_or_capable(inode))

			return -EACCES;



		if (get_user(flags, (int __user *) arg))

			return -EFAULT;



		err = mnt_want_write_file(filp);

		if (err)

			return err;



		flags = ext4_mask_flags(inode->i_mode, flags);



		mutex_lock(&inode->i_mutex);

		err = ext4_ioctl_setflags(inode, flags);

		mutex_unlock(&inode->i_mutex);

		mnt_drop_write_file(filp);

		return err;
@@ -689,6 +837,60 @@ encryption_policy_out: 
		return -EOPNOTSUPP;

#endif

	}

	case EXT4_IOC_FSGETXATTR:

	{

		struct fsxattr fa;



		memset(&fa, 0, sizeof(struct fsxattr));

		ext4_get_inode_flags(ei);

		fa.fsx_xflags = ext4_iflags_to_xflags(ei->i_flags & EXT4_FL_USER_VISIBLE);



		if (EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,

				EXT4_FEATURE_RO_COMPAT_PROJECT)) {

			fa.fsx_projid = (__u32)from_kprojid(&init_user_ns,

				EXT4_I(inode)->i_projid);

		}



		if (copy_to_user((struct fsxattr __user *)arg,

				 &fa, sizeof(fa)))

			return -EFAULT;

		return 0;

	}

	case EXT4_IOC_FSSETXATTR:

	{

		struct fsxattr fa;

		int err;



		if (copy_from_user(&fa, (struct fsxattr __user *)arg,

				   sizeof(fa)))

			return -EFAULT;



		/* Make sure caller has proper permission */

		if (!inode_owner_or_capable(inode))

			return -EACCES;



		err = mnt_want_write_file(filp);

		if (err)

			return err;



		flags = ext4_xflags_to_iflags(fa.fsx_xflags);

		flags = ext4_mask_flags(inode->i_mode, flags);



		mutex_lock(&inode->i_mutex);

		flags = (ei->i_flags & ~EXT4_FL_XFLAG_VISIBLE) |

			 (flags & EXT4_FL_XFLAG_VISIBLE);

		err = ext4_ioctl_setflags(inode, flags);

		mutex_unlock(&inode->i_mutex);

		mnt_drop_write_file(filp);

		if (err)

			return err;



		err = ext4_ioctl_setproject(filp, fa.fsx_projid);

		if (err)

			return err;



		return 0;

	}

	default:

		return -ENOTTY;

	}

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