[XFS] xfs_setattr currently doesn't just handle the attributes set through

->setattr but also addition XFS-specific attributes: project id, inode
flags and extent size hint. Having these in a single function makes it
more complicated and forces to have us a bhv_vattr intermediate structure
eating up stackspace.

This patch adds a new xfs_ioctl_setattr helper for the XFS ioctls that set
these attributes and remove the code to set them through xfs_setattr.

SGI-PV: 984564

SGI-Modid: xfs-linux-melb:xfs-kern:31677a

Signed-off-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Tim Shimmin <tes@sgi.com>
Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>

1 files changed, 303 insertions, 36 deletions

diff --git a/fs/xfs/linux-2.6/xfs_ioctl.c b/fs/xfs/linux-2.6/xfs_ioctl.c
index 8eddaff36843..d2bbb0532ef6 100644
--- a/fs/xfs/linux-2.6/xfs_ioctl.c
+++ b/fs/xfs/linux-2.6/xfs_ioctl.c
@@ -48,6 +48,8 @@
 #include "xfs_dfrag.h"
 #include "xfs_fsops.h"
 #include "xfs_vnodeops.h"
+#include "xfs_quota.h"
+#include "xfs_inode_item.h"
 
 #include <linux/capability.h>
 #include <linux/dcache.h>
@@ -879,6 +881,297 @@ xfs_ioc_fsgetxattr(
         return 0;
 }
 
+STATIC void
+xfs_set_diflags(
+        struct xfs_inode        *ip,
+        unsigned int            xflags)
+{
+        unsigned int            di_flags;
+
+        /* can't set PREALLOC this way, just preserve it */
+        di_flags = (ip->i_d.di_flags & XFS_DIFLAG_PREALLOC);
+        if (xflags & XFS_XFLAG_IMMUTABLE)
+                di_flags |= XFS_DIFLAG_IMMUTABLE;
+        if (xflags & XFS_XFLAG_APPEND)
+                di_flags |= XFS_DIFLAG_APPEND;
+        if (xflags & XFS_XFLAG_SYNC)
+                di_flags |= XFS_DIFLAG_SYNC;
+        if (xflags & XFS_XFLAG_NOATIME)
+                di_flags |= XFS_DIFLAG_NOATIME;
+        if (xflags & XFS_XFLAG_NODUMP)
+                di_flags |= XFS_DIFLAG_NODUMP;
+        if (xflags & XFS_XFLAG_PROJINHERIT)
+                di_flags |= XFS_DIFLAG_PROJINHERIT;
+        if (xflags & XFS_XFLAG_NODEFRAG)
+                di_flags |= XFS_DIFLAG_NODEFRAG;
+        if (xflags & XFS_XFLAG_FILESTREAM)
+                di_flags |= XFS_DIFLAG_FILESTREAM;
+        if ((ip->i_d.di_mode & S_IFMT) == S_IFDIR) {
+                if (xflags & XFS_XFLAG_RTINHERIT)
+                        di_flags |= XFS_DIFLAG_RTINHERIT;
+                if (xflags & XFS_XFLAG_NOSYMLINKS)
+                        di_flags |= XFS_DIFLAG_NOSYMLINKS;
+                if (xflags & XFS_XFLAG_EXTSZINHERIT)
+                        di_flags |= XFS_DIFLAG_EXTSZINHERIT;
+        } else if ((ip->i_d.di_mode & S_IFMT) == S_IFREG) {
+                if (xflags & XFS_XFLAG_REALTIME)
+                        di_flags |= XFS_DIFLAG_REALTIME;
+                if (xflags & XFS_XFLAG_EXTSIZE)
+                        di_flags |= XFS_DIFLAG_EXTSIZE;
+        }
+
+        ip->i_d.di_flags = di_flags;
+}
+
+
+#define FSX_PROJID      1
+#define FSX_EXTSIZE     2
+#define FSX_XFLAGS      4
+#define FSX_NONBLOCK    8
+
+STATIC int
+xfs_ioctl_setattr(
+        xfs_inode_t             *ip,
+        struct fsxattr          *fa,
+        int                     mask)
+{
+        struct xfs_mount        *mp = ip->i_mount;
+        struct xfs_trans        *tp;
+        unsigned int            lock_flags = 0;
+        struct xfs_dquot        *udqp = NULL, *gdqp = NULL;
+        struct xfs_dquot        *olddquot = NULL;
+        int                     code;
+
+        xfs_itrace_entry(ip);
+
+        if (mp->m_flags & XFS_MOUNT_RDONLY)
+                return XFS_ERROR(EROFS);
+        if (XFS_FORCED_SHUTDOWN(mp))
+                return XFS_ERROR(EIO);
+
+        /*
+         * If disk quotas is on, we make sure that the dquots do exist on disk,
+         * before we start any other transactions. Trying to do this later
+         * is messy. We don't care to take a readlock to look at the ids
+         * in inode here, because we can't hold it across the trans_reserve.
+         * 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)) {
+                code = XFS_QM_DQVOPALLOC(mp, ip, ip->i_d.di_uid,
+                                         ip->i_d.di_gid, fa->fsx_projid,
+                                         XFS_QMOPT_PQUOTA, &udqp, &gdqp);
+                if (code)
+                        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, 0, XFS_ICHANGE_LOG_RES(mp), 0, 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 (current->fsuid != ip->i_d.di_uid && !capable(CAP_FOWNER)) {
+                code = XFS_ERROR(EPERM);
+                goto error_return;
+        }
+
+        /*
+         * Do a quota reservation only if projid is actually going to change.
+         */
+        if (mask & FSX_PROJID) {
+                if (XFS_IS_PQUOTA_ON(mp) &&
+                    ip->i_d.di_projid != fa->fsx_projid) {
+                        ASSERT(tp);
+                        code = XFS_QM_DQVOPCHOWNRESV(mp, tp, ip, udqp, gdqp,
+                                                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 = XFS_ERROR(EINVAL);       /* EFBIG? */
+                        goto error_return;
+                }
+
+                /*
+                 * Extent size must be a multiple of the appropriate block
+                 * size, if set at all.
+                 */
+                if (fa->fsx_extsize != 0) {
+                        xfs_extlen_t    size;
+
+                        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 (fa->fsx_extsize % size) {
+                                code = XFS_ERROR(EINVAL);
+                                goto error_return;
+                        }
+                }
+        }
+
+
+        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 = XFS_ERROR(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 = XFS_ERROR(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 = XFS_ERROR(EPERM);
+                        goto error_return;
+                }
+        }
+
+        xfs_trans_ijoin(tp, ip, lock_flags);
+        xfs_trans_ihold(tp, ip);
+
+        /*
+         * Change file ownership.  Must be the owner or privileged.
+         * If the system was configured with the "restricted_chown"
+         * option, the owner is not permitted to give away the file,
+         * and can change the group id only to a group of which he
+         * or she is a member.
+         */
+        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(CAP_FSETID))
+                        ip->i_d.di_mode &= ~(S_ISUID|S_ISGID);
+
+                /*
+                 * Change the ownerships and register quota modifications
+                 * in the transaction.
+                 */
+                if (ip->i_d.di_projid != fa->fsx_projid) {
+                        if (XFS_IS_PQUOTA_ON(mp)) {
+                                olddquot = XFS_QM_DQVOPCHOWN(mp, tp, ip,
+                                                        &ip->i_gdquot, gdqp);
+                        }
+                        ip->i_d.di_projid = fa->fsx_projid;
+
+                        /*
+                         * We may have to rev the inode as well as
+                         * the superblock version number since projids didn't
+                         * exist before DINODE_VERSION_2 and SB_VERSION_NLINK.
+                         */
+                        if (ip->i_d.di_version == XFS_DINODE_VERSION_1)
+                                xfs_bump_ino_vers2(tp, ip);
+                }
+
+        }
+
+        if (mask & FSX_EXTSIZE)
+                ip->i_d.di_extsize = fa->fsx_extsize >> mp->m_sb.sb_blocklog;
+        if (mask & FSX_XFLAGS)
+                xfs_set_diflags(ip, fa->fsx_xflags);
+
+        xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
+        xfs_ichgtime(ip, XFS_ICHGTIME_CHG);
+
+        XFS_STATS_INC(xs_ig_attrchg);
+
+        /*
+         * 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.
+         */
+        XFS_QM_DQRELE(mp, olddquot);
+        XFS_QM_DQRELE(mp, udqp);
+        XFS_QM_DQRELE(mp, gdqp);
+
+        if (code)
+                return code;
+
+        if (DM_EVENT_ENABLED(ip, DM_EVENT_ATTRIBUTE)) {
+                XFS_SEND_NAMESP(mp, DM_EVENT_ATTRIBUTE, ip, DM_RIGHT_NULL,
+                                NULL, DM_RIGHT_NULL, NULL, NULL, 0, 0,
+                                (mask & FSX_NONBLOCK) ? DM_FLAGS_NDELAY : 0);
+        }
+
+        vn_revalidate(XFS_ITOV(ip));    /* update flags */
+        return 0;
+
+ error_return:
+        XFS_QM_DQRELE(mp, udqp);
+        XFS_QM_DQRELE(mp, gdqp);
+        xfs_trans_cancel(tp, 0);
+        if (lock_flags)
+                xfs_iunlock(ip, lock_flags);
+        return code;
+}
+
 STATIC int
 xfs_ioc_fssetxattr(
         xfs_inode_t             *ip,
@@ -886,31 +1179,16 @@ xfs_ioc_fssetxattr(
         void                    __user *arg)
 {
         struct fsxattr          fa;
-        struct bhv_vattr        *vattr;
-        int                     error;
-        int                     attr_flags;
+        unsigned int            mask;
 
         if (copy_from_user(&fa, arg, sizeof(fa)))
                 return -EFAULT;
 
-        vattr = kmalloc(sizeof(*vattr), GFP_KERNEL);
-        if (unlikely(!vattr))
-                return -ENOMEM;
-
-        attr_flags = 0;
+        mask = FSX_XFLAGS | FSX_EXTSIZE | FSX_PROJID;
         if (filp->f_flags & (O_NDELAY|O_NONBLOCK))
-                attr_flags |= ATTR_NONBLOCK;
+                mask |= FSX_NONBLOCK;
 
-        vattr->va_mask = XFS_AT_XFLAGS | XFS_AT_EXTSIZE | XFS_AT_PROJID;
-        vattr->va_xflags  = fa.fsx_xflags;
-        vattr->va_extsize = fa.fsx_extsize;
-        vattr->va_projid  = fa.fsx_projid;
-
-        error = -xfs_setattr(ip, vattr, attr_flags, NULL);
-        if (!error)
-                vn_revalidate(XFS_ITOV(ip));    /* update flags */
-        kfree(vattr);
-        return 0;
+        return -xfs_ioctl_setattr(ip, &fa, mask);
 }
 
 STATIC int
@@ -932,10 +1210,9 @@ xfs_ioc_setxflags(
         struct file             *filp,
         void                    __user *arg)
 {
-        struct bhv_vattr        *vattr;
+        struct fsxattr          fa;
         unsigned int            flags;
-        int                     attr_flags;
-        int                     error;
+        unsigned int            mask;
 
         if (copy_from_user(&flags, arg, sizeof(flags)))
                 return -EFAULT;
@@ -945,22 +1222,12 @@ xfs_ioc_setxflags(
                       FS_SYNC_FL))
                 return -EOPNOTSUPP;
 
-        vattr = kmalloc(sizeof(*vattr), GFP_KERNEL);
-        if (unlikely(!vattr))
-                return -ENOMEM;
-
-        attr_flags = 0;
+        mask = FSX_XFLAGS;
         if (filp->f_flags & (O_NDELAY|O_NONBLOCK))
-                attr_flags |= ATTR_NONBLOCK;
+                mask |= FSX_NONBLOCK;
+        fa.fsx_xflags = xfs_merge_ioc_xflags(flags, xfs_ip2xflags(ip));
 
-        vattr->va_mask = XFS_AT_XFLAGS;
-        vattr->va_xflags = xfs_merge_ioc_xflags(flags, xfs_ip2xflags(ip));
-
-        error = -xfs_setattr(ip, vattr, attr_flags, NULL);
-        if (likely(!error))
-                vn_revalidate(XFS_ITOV(ip));    /* update flags */
-        kfree(vattr);
-        return error;
+        return -xfs_ioctl_setattr(ip, &fa, mask);
 }
 
 STATIC int