diff options
author | Dave Chinner <david@fromorbit.com> | 2015-02-02 10:57:30 +1100 |
---|---|---|
committer | Dave Chinner <david@fromorbit.com> | 2015-02-02 10:57:30 +1100 |
commit | 179073620d8090e9c52bf203e2033fc9cfe088b3 (patch) | |
tree | eda577c597f9fc56f6df337b46058ce3cd4f5aa4 /fs/xfs | |
parent | 3fd1b0d158b6b98d9561e2f7f9c6970d95cf71d6 (diff) | |
parent | 9b94fcc39822b450af823b3d8cbef6b53ce87ed9 (diff) | |
download | linux-179073620d8090e9c52bf203e2033fc9cfe088b3.tar.gz linux-179073620d8090e9c52bf203e2033fc9cfe088b3.tar.bz2 linux-179073620d8090e9c52bf203e2033fc9cfe088b3.zip |
Merge branch 'xfs-ioctl-setattr-cleanup' into for-next
Diffstat (limited to 'fs/xfs')
-rw-r--r-- | fs/xfs/xfs_ioctl.c | 451 |
1 files changed, 231 insertions, 220 deletions
diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c index d58bcd28f5f8..b88ab927debe 100644 --- a/fs/xfs/xfs_ioctl.c +++ b/fs/xfs/xfs_ioctl.c @@ -987,20 +987,182 @@ xfs_diflags_to_linux( inode->i_flags &= ~S_NOATIME; } -#define FSX_PROJID 1 -#define FSX_EXTSIZE 2 -#define FSX_XFLAGS 4 -#define FSX_NONBLOCK 8 +static int +xfs_ioctl_setattr_xflags( + struct xfs_trans *tp, + struct xfs_inode *ip, + struct fsxattr *fa) +{ + struct xfs_mount *mp = ip->i_mount; + + /* Can't change realtime flag if any extents are allocated. */ + if ((ip->i_d.di_nextents || ip->i_delayed_blks) && + XFS_IS_REALTIME_INODE(ip) != (fa->fsx_xflags & XFS_XFLAG_REALTIME)) + return -EINVAL; + + /* If realtime flag is set then must have realtime device */ + if (fa->fsx_xflags & XFS_XFLAG_REALTIME) { + if (mp->m_sb.sb_rblocks == 0 || mp->m_sb.sb_rextsize == 0 || + (ip->i_d.di_extsize % mp->m_sb.sb_rextsize)) + return -EINVAL; + } + + /* + * Can't modify an immutable/append-only file unless + * we have appropriate permission. + */ + if (((ip->i_d.di_flags & (XFS_DIFLAG_IMMUTABLE | XFS_DIFLAG_APPEND)) || + (fa->fsx_xflags & (XFS_XFLAG_IMMUTABLE | XFS_XFLAG_APPEND))) && + !capable(CAP_LINUX_IMMUTABLE)) + return -EPERM; + + xfs_set_diflags(ip, fa->fsx_xflags); + xfs_diflags_to_linux(ip); + xfs_trans_ichgtime(tp, ip, XFS_ICHGTIME_CHG); + xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); + XFS_STATS_INC(xs_ig_attrchg); + return 0; +} + +/* + * Set up the transaction structure for the setattr operation, checking that we + * have permission to do so. On success, return a clean transaction and the + * inode locked exclusively ready for further operation specific checks. On + * failure, return an error without modifying or locking the inode. + */ +static struct xfs_trans * +xfs_ioctl_setattr_get_trans( + struct xfs_inode *ip) +{ + struct xfs_mount *mp = ip->i_mount; + struct xfs_trans *tp; + int error; + + if (mp->m_flags & XFS_MOUNT_RDONLY) + return ERR_PTR(-EROFS); + if (XFS_FORCED_SHUTDOWN(mp)) + return ERR_PTR(-EIO); + + tp = xfs_trans_alloc(mp, XFS_TRANS_SETATTR_NOT_SIZE); + error = xfs_trans_reserve(tp, &M_RES(mp)->tr_ichange, 0, 0); + if (error) + goto out_cancel; + + xfs_ilock(ip, XFS_ILOCK_EXCL); + xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL); + + /* + * CAP_FOWNER overrides the following restrictions: + * + * The user ID of the calling process must be equal to the file owner + * ID, except in cases where the CAP_FSETID capability is applicable. + */ + if (!inode_owner_or_capable(VFS_I(ip))) { + error = -EPERM; + goto out_cancel; + } + + if (mp->m_flags & XFS_MOUNT_WSYNC) + xfs_trans_set_sync(tp); + + return tp; + +out_cancel: + xfs_trans_cancel(tp, 0); + return ERR_PTR(error); +} + +/* + * extent size hint validation is somewhat cumbersome. Rules are: + * + * 1. extent size hint is only valid for directories and regular files + * 2. XFS_XFLAG_EXTSIZE is only valid for regular files + * 3. XFS_XFLAG_EXTSZINHERIT is only valid for directories. + * 4. can only be changed on regular files if no extents are allocated + * 5. can be changed on directories at any time + * 6. extsize hint of 0 turns off hints, clears inode flags. + * 7. Extent size must be a multiple of the appropriate block size. + * 8. for non-realtime files, the extent size hint must be limited + * to half the AG size to avoid alignment extending the extent beyond the + * limits of the AG. + */ +int +xfs_ioctl_setattr_check_extsize( + struct xfs_inode *ip, + struct fsxattr *fa) +{ + struct xfs_mount *mp = ip->i_mount; + + if ((fa->fsx_xflags & XFS_XFLAG_EXTSIZE) && !S_ISREG(ip->i_d.di_mode)) + return -EINVAL; + + if ((fa->fsx_xflags & XFS_XFLAG_EXTSZINHERIT) && + !S_ISDIR(ip->i_d.di_mode)) + return -EINVAL; + + if (S_ISREG(ip->i_d.di_mode) && ip->i_d.di_nextents && + ((ip->i_d.di_extsize << mp->m_sb.sb_blocklog) != fa->fsx_extsize)) + return -EINVAL; + + if (fa->fsx_extsize != 0) { + xfs_extlen_t size; + xfs_fsblock_t extsize_fsb; + + extsize_fsb = XFS_B_TO_FSB(mp, fa->fsx_extsize); + if (extsize_fsb > MAXEXTLEN) + return -EINVAL; + + if (XFS_IS_REALTIME_INODE(ip) || + (fa->fsx_xflags & XFS_XFLAG_REALTIME)) { + size = mp->m_sb.sb_rextsize << mp->m_sb.sb_blocklog; + } else { + size = mp->m_sb.sb_blocksize; + if (extsize_fsb > mp->m_sb.sb_agblocks / 2) + return -EINVAL; + } + + if (fa->fsx_extsize % size) + return -EINVAL; + } else + fa->fsx_xflags &= ~(XFS_XFLAG_EXTSIZE | XFS_XFLAG_EXTSZINHERIT); + + return 0; +} + +int +xfs_ioctl_setattr_check_projid( + struct xfs_inode *ip, + struct fsxattr *fa) +{ + /* Disallow 32bit project ids if projid32bit feature is not enabled. */ + if (fa->fsx_projid > (__uint16_t)-1 && + !xfs_sb_version_hasprojid32bit(&ip->i_mount->m_sb)) + return -EINVAL; + + /* + * Project Quota ID state is only allowed to change from within the init + * namespace. Enforce that restriction only if we are trying to change + * the quota ID state. Everything else is allowed in user namespaces. + */ + if (current_user_ns() == &init_user_ns) + return 0; + + if (xfs_get_projid(ip) != fa->fsx_projid) + return -EINVAL; + if ((fa->fsx_xflags & XFS_XFLAG_PROJINHERIT) != + (ip->i_d.di_flags & XFS_DIFLAG_PROJINHERIT)) + return -EINVAL; + + return 0; +} STATIC int xfs_ioctl_setattr( xfs_inode_t *ip, - struct fsxattr *fa, - int mask) + struct fsxattr *fa) { struct xfs_mount *mp = ip->i_mount; struct xfs_trans *tp; - unsigned int lock_flags = 0; struct xfs_dquot *udqp = NULL; struct xfs_dquot *pdqp = NULL; struct xfs_dquot *olddquot = NULL; @@ -1008,17 +1170,9 @@ xfs_ioctl_setattr( trace_xfs_ioctl_setattr(ip); - if (mp->m_flags & XFS_MOUNT_RDONLY) - return -EROFS; - if (XFS_FORCED_SHUTDOWN(mp)) - return -EIO; - - /* - * Disallow 32bit project ids when projid32bit feature is not enabled. - */ - if ((mask & FSX_PROJID) && (fa->fsx_projid > (__uint16_t)-1) && - !xfs_sb_version_hasprojid32bit(&ip->i_mount->m_sb)) - return -EINVAL; + code = xfs_ioctl_setattr_check_projid(ip, fa); + if (code) + return code; /* * If disk quotas is on, we make sure that the dquots do exist on disk, @@ -1028,7 +1182,7 @@ xfs_ioctl_setattr( * If the IDs do change before we take the ilock, we're covered * because the i_*dquot fields will get updated anyway. */ - if (XFS_IS_QUOTA_ON(mp) && (mask & FSX_PROJID)) { + if (XFS_IS_QUOTA_ON(mp)) { code = xfs_qm_vop_dqalloc(ip, ip->i_d.di_uid, ip->i_d.di_gid, fa->fsx_projid, XFS_QMOPT_PQUOTA, &udqp, NULL, &pdqp); @@ -1036,175 +1190,49 @@ xfs_ioctl_setattr( return code; } - /* - * For the other attributes, we acquire the inode lock and - * first do an error checking pass. - */ - tp = xfs_trans_alloc(mp, XFS_TRANS_SETATTR_NOT_SIZE); - code = xfs_trans_reserve(tp, &M_RES(mp)->tr_ichange, 0, 0); - if (code) - goto error_return; - - lock_flags = XFS_ILOCK_EXCL; - xfs_ilock(ip, lock_flags); - - /* - * CAP_FOWNER overrides the following restrictions: - * - * The user ID of the calling process must be equal - * to the file owner ID, except in cases where the - * CAP_FSETID capability is applicable. - */ - if (!inode_owner_or_capable(VFS_I(ip))) { - code = -EPERM; - goto error_return; + tp = xfs_ioctl_setattr_get_trans(ip); + if (IS_ERR(tp)) { + code = PTR_ERR(tp); + goto error_free_dquots; } - /* - * Do a quota reservation only if projid is actually going to change. - * Only allow changing of projid from init_user_ns since it is a - * non user namespace aware identifier. - */ - if (mask & FSX_PROJID) { - if (current_user_ns() != &init_user_ns) { - code = -EINVAL; - goto error_return; - } - - if (XFS_IS_QUOTA_RUNNING(mp) && - XFS_IS_PQUOTA_ON(mp) && - xfs_get_projid(ip) != fa->fsx_projid) { - ASSERT(tp); - code = xfs_qm_vop_chown_reserve(tp, ip, udqp, NULL, - pdqp, capable(CAP_FOWNER) ? - XFS_QMOPT_FORCE_RES : 0); - if (code) /* out of quota */ - goto error_return; - } - } - if (mask & FSX_EXTSIZE) { - /* - * Can't change extent size if any extents are allocated. - */ - if (ip->i_d.di_nextents && - ((ip->i_d.di_extsize << mp->m_sb.sb_blocklog) != - fa->fsx_extsize)) { - code = -EINVAL; /* EFBIG? */ - goto error_return; - } - - /* - * Extent size must be a multiple of the appropriate block - * size, if set at all. It must also be smaller than the - * maximum extent size supported by the filesystem. - * - * Also, for non-realtime files, limit the extent size hint to - * half the size of the AGs in the filesystem so alignment - * doesn't result in extents larger than an AG. - */ - if (fa->fsx_extsize != 0) { - xfs_extlen_t size; - xfs_fsblock_t extsize_fsb; - - extsize_fsb = XFS_B_TO_FSB(mp, fa->fsx_extsize); - if (extsize_fsb > MAXEXTLEN) { - code = -EINVAL; - goto error_return; - } - - if (XFS_IS_REALTIME_INODE(ip) || - ((mask & FSX_XFLAGS) && - (fa->fsx_xflags & XFS_XFLAG_REALTIME))) { - size = mp->m_sb.sb_rextsize << - mp->m_sb.sb_blocklog; - } else { - size = mp->m_sb.sb_blocksize; - if (extsize_fsb > mp->m_sb.sb_agblocks / 2) { - code = -EINVAL; - goto error_return; - } - } - - if (fa->fsx_extsize % size) { - code = -EINVAL; - goto error_return; - } - } + if (XFS_IS_QUOTA_RUNNING(mp) && XFS_IS_PQUOTA_ON(mp) && + xfs_get_projid(ip) != fa->fsx_projid) { + code = xfs_qm_vop_chown_reserve(tp, ip, udqp, NULL, pdqp, + capable(CAP_FOWNER) ? XFS_QMOPT_FORCE_RES : 0); + if (code) /* out of quota */ + goto error_trans_cancel; } + code = xfs_ioctl_setattr_check_extsize(ip, fa); + if (code) + goto error_trans_cancel; - if (mask & FSX_XFLAGS) { - /* - * Can't change realtime flag if any extents are allocated. - */ - if ((ip->i_d.di_nextents || ip->i_delayed_blks) && - (XFS_IS_REALTIME_INODE(ip)) != - (fa->fsx_xflags & XFS_XFLAG_REALTIME)) { - code = -EINVAL; /* EFBIG? */ - goto error_return; - } - - /* - * If realtime flag is set then must have realtime data. - */ - if ((fa->fsx_xflags & XFS_XFLAG_REALTIME)) { - if ((mp->m_sb.sb_rblocks == 0) || - (mp->m_sb.sb_rextsize == 0) || - (ip->i_d.di_extsize % mp->m_sb.sb_rextsize)) { - code = -EINVAL; - goto error_return; - } - } - - /* - * Can't modify an immutable/append-only file unless - * we have appropriate permission. - */ - if ((ip->i_d.di_flags & - (XFS_DIFLAG_IMMUTABLE|XFS_DIFLAG_APPEND) || - (fa->fsx_xflags & - (XFS_XFLAG_IMMUTABLE | XFS_XFLAG_APPEND))) && - !capable(CAP_LINUX_IMMUTABLE)) { - code = -EPERM; - goto error_return; - } - } - - xfs_trans_ijoin(tp, ip, 0); + code = xfs_ioctl_setattr_xflags(tp, ip, fa); + if (code) + goto error_trans_cancel; /* - * Change file ownership. Must be the owner or privileged. + * Change file ownership. Must be the owner or privileged. CAP_FSETID + * overrides the following restrictions: + * + * The set-user-ID and set-group-ID bits of a file will be cleared upon + * successful return from chown() */ - if (mask & FSX_PROJID) { - /* - * CAP_FSETID overrides the following restrictions: - * - * The set-user-ID and set-group-ID bits of a file will be - * cleared upon successful return from chown() - */ - if ((ip->i_d.di_mode & (S_ISUID|S_ISGID)) && - !capable_wrt_inode_uidgid(VFS_I(ip), CAP_FSETID)) - ip->i_d.di_mode &= ~(S_ISUID|S_ISGID); - - /* - * Change the ownerships and register quota modifications - * in the transaction. - */ - if (xfs_get_projid(ip) != fa->fsx_projid) { - if (XFS_IS_QUOTA_RUNNING(mp) && XFS_IS_PQUOTA_ON(mp)) { - olddquot = xfs_qm_vop_chown(tp, ip, - &ip->i_pdquot, pdqp); - } - ASSERT(ip->i_d.di_version > 1); - xfs_set_projid(ip, fa->fsx_projid); - } - } + if ((ip->i_d.di_mode & (S_ISUID|S_ISGID)) && + !capable_wrt_inode_uidgid(VFS_I(ip), CAP_FSETID)) + ip->i_d.di_mode &= ~(S_ISUID|S_ISGID); - if (mask & FSX_XFLAGS) { - xfs_set_diflags(ip, fa->fsx_xflags); - xfs_diflags_to_linux(ip); + /* Change the ownerships and register project quota modifications */ + if (xfs_get_projid(ip) != fa->fsx_projid) { + if (XFS_IS_QUOTA_RUNNING(mp) && XFS_IS_PQUOTA_ON(mp)) { + olddquot = xfs_qm_vop_chown(tp, ip, + &ip->i_pdquot, pdqp); + } + ASSERT(ip->i_d.di_version > 1); + xfs_set_projid(ip, fa->fsx_projid); } /* @@ -1212,34 +1240,12 @@ xfs_ioctl_setattr( * extent size hint should be set on the inode. If no extent size flags * are set on the inode then unconditionally clear the extent size hint. */ - if (mask & FSX_EXTSIZE) { - int extsize = 0; - - if (ip->i_d.di_flags & - (XFS_DIFLAG_EXTSIZE | XFS_DIFLAG_EXTSZINHERIT)) - extsize = fa->fsx_extsize >> mp->m_sb.sb_blocklog; - ip->i_d.di_extsize = extsize; - } - - xfs_trans_ichgtime(tp, ip, XFS_ICHGTIME_CHG); - xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); - - XFS_STATS_INC(xs_ig_attrchg); + if (ip->i_d.di_flags & (XFS_DIFLAG_EXTSIZE | XFS_DIFLAG_EXTSZINHERIT)) + ip->i_d.di_extsize = fa->fsx_extsize >> mp->m_sb.sb_blocklog; + else + ip->i_d.di_extsize = 0; - /* - * If this is a synchronous mount, make sure that the - * transaction goes to disk before returning to the user. - * This is slightly sub-optimal in that truncates require - * two sync transactions instead of one for wsync filesystems. - * One for the truncate and one for the timestamps since we - * don't want to change the timestamps unless we're sure the - * truncate worked. Truncates are less than 1% of the laddis - * mix so this probably isn't worth the trouble to optimize. - */ - if (mp->m_flags & XFS_MOUNT_WSYNC) - xfs_trans_set_sync(tp); code = xfs_trans_commit(tp, 0); - xfs_iunlock(ip, lock_flags); /* * Release any dquot(s) the inode had kept before chown. @@ -1250,12 +1256,11 @@ xfs_ioctl_setattr( return code; - error_return: +error_trans_cancel: + xfs_trans_cancel(tp, 0); +error_free_dquots: xfs_qm_dqrele(udqp); xfs_qm_dqrele(pdqp); - xfs_trans_cancel(tp, 0); - if (lock_flags) - xfs_iunlock(ip, lock_flags); return code; } @@ -1266,20 +1271,15 @@ xfs_ioc_fssetxattr( void __user *arg) { struct fsxattr fa; - unsigned int mask; int error; if (copy_from_user(&fa, arg, sizeof(fa))) return -EFAULT; - mask = FSX_XFLAGS | FSX_EXTSIZE | FSX_PROJID; - if (filp->f_flags & (O_NDELAY|O_NONBLOCK)) - mask |= FSX_NONBLOCK; - error = mnt_want_write_file(filp); if (error) return error; - error = xfs_ioctl_setattr(ip, &fa, mask); + error = xfs_ioctl_setattr(ip, &fa); mnt_drop_write_file(filp); return error; } @@ -1299,14 +1299,14 @@ xfs_ioc_getxflags( STATIC int xfs_ioc_setxflags( - xfs_inode_t *ip, + struct xfs_inode *ip, struct file *filp, void __user *arg) { + struct xfs_trans *tp; struct fsxattr fa; unsigned int flags; - unsigned int mask; - int error; + int error; if (copy_from_user(&flags, arg, sizeof(flags))) return -EFAULT; @@ -1316,15 +1316,26 @@ xfs_ioc_setxflags( FS_SYNC_FL)) return -EOPNOTSUPP; - mask = FSX_XFLAGS; - if (filp->f_flags & (O_NDELAY|O_NONBLOCK)) - mask |= FSX_NONBLOCK; fa.fsx_xflags = xfs_merge_ioc_xflags(flags, xfs_ip2xflags(ip)); error = mnt_want_write_file(filp); if (error) return error; - error = xfs_ioctl_setattr(ip, &fa, mask); + + tp = xfs_ioctl_setattr_get_trans(ip); + if (IS_ERR(tp)) { + error = PTR_ERR(tp); + goto out_drop_write; + } + + error = xfs_ioctl_setattr_xflags(tp, ip, &fa); + if (error) { + xfs_trans_cancel(tp, 0); + goto out_drop_write; + } + + error = xfs_trans_commit(tp, 0); +out_drop_write: mnt_drop_write_file(filp); return error; } |