6 files changed, 164 insertions, 3 deletions

diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
index c79b875f0354..ac133ea91c4b 100644
--- a/fs/xfs/xfs_inode.c
+++ b/fs/xfs/xfs_inode.c
@@ -1333,6 +1333,113 @@ xfs_create(
 }
 
 int
+xfs_create_tmpfile(
+        struct xfs_inode        *dp,
+        struct dentry           *dentry,
+        umode_t                 mode)
+{
+        struct xfs_mount        *mp = dp->i_mount;
+        struct xfs_inode        *ip = NULL;
+        struct xfs_trans        *tp = NULL;
+        int                     error;
+        uint                    cancel_flags = XFS_TRANS_RELEASE_LOG_RES;
+        prid_t                  prid;
+        struct xfs_dquot        *udqp = NULL;
+        struct xfs_dquot        *gdqp = NULL;
+        struct xfs_dquot        *pdqp = NULL;
+        struct xfs_trans_res    *tres;
+        uint                    resblks;
+
+        if (XFS_FORCED_SHUTDOWN(mp))
+                return XFS_ERROR(EIO);
+
+        prid = xfs_get_initial_prid(dp);
+
+        /*
+         * Make sure that we have allocated dquot(s) on disk.
+         */
+        error = xfs_qm_vop_dqalloc(dp, xfs_kuid_to_uid(current_fsuid()),
+                                xfs_kgid_to_gid(current_fsgid()), prid,
+                                XFS_QMOPT_QUOTALL | XFS_QMOPT_INHERIT,
+                                &udqp, &gdqp, &pdqp);
+        if (error)
+                return error;
+
+        resblks = XFS_IALLOC_SPACE_RES(mp);
+        tp = xfs_trans_alloc(mp, XFS_TRANS_CREATE_TMPFILE);
+
+        tres = &M_RES(mp)->tr_create_tmpfile;
+        error = xfs_trans_reserve(tp, tres, resblks, 0);
+        if (error == ENOSPC) {
+                /* No space at all so try a "no-allocation" reservation */
+                resblks = 0;
+                error = xfs_trans_reserve(tp, tres, 0, 0);
+        }
+        if (error) {
+                cancel_flags = 0;
+                goto out_trans_cancel;
+        }
+
+        error = xfs_trans_reserve_quota(tp, mp, udqp, gdqp,
+                                                pdqp, resblks, 1, 0);
+        if (error)
+                goto out_trans_cancel;
+
+        error = xfs_dir_ialloc(&tp, dp, mode, 1, 0,
+                                prid, resblks > 0, &ip, NULL);
+        if (error) {
+                if (error == ENOSPC)
+                        goto out_trans_cancel;
+                goto out_trans_abort;
+        }
+
+        if (mp->m_flags & XFS_MOUNT_WSYNC)
+                xfs_trans_set_sync(tp);
+
+        /*
+         * Attach the dquot(s) to the inodes and modify them incore.
+         * These ids of the inode couldn't have changed since the new
+         * inode has been locked ever since it was created.
+         */
+        xfs_qm_vop_create_dqattach(tp, ip, udqp, gdqp, pdqp);
+
+        ip->i_d.di_nlink--;
+        d_tmpfile(dentry, VFS_I(ip));
+        error = xfs_iunlink(tp, ip);
+        if (error)
+                goto out_trans_abort;
+
+        error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
+        if (error)
+                goto out_release_inode;
+
+        xfs_qm_dqrele(udqp);
+        xfs_qm_dqrele(gdqp);
+        xfs_qm_dqrele(pdqp);
+
+        return 0;
+
+ out_trans_abort:
+        cancel_flags |= XFS_TRANS_ABORT;
+ out_trans_cancel:
+        xfs_trans_cancel(tp, cancel_flags);
+ out_release_inode:
+        /*
+         * Wait until after the current transaction is aborted to
+         * release the inode.  This prevents recursive transactions
+         * and deadlocks from xfs_inactive.
+         */
+        if (ip)
+                IRELE(ip);
+
+        xfs_qm_dqrele(udqp);
+        xfs_qm_dqrele(gdqp);
+        xfs_qm_dqrele(pdqp);
+
+        return error;
+}
+
+int
 xfs_link(
         xfs_inode_t             *tdp,
         xfs_inode_t             *sip,
diff --git a/fs/xfs/xfs_inode.h b/fs/xfs/xfs_inode.h
index 6c58349494e7..3a978208f30b 100644
--- a/fs/xfs/xfs_inode.h
+++ b/fs/xfs/xfs_inode.h
@@ -333,6 +333,8 @@ int		xfs_lookup(struct xfs_inode *dp, struct xfs_name *name,
                            struct xfs_inode **ipp, struct xfs_name *ci_name);
 int             xfs_create(struct xfs_inode *dp, struct xfs_name *name,
                            umode_t mode, xfs_dev_t rdev, struct xfs_inode **ipp);
+int             xfs_create_tmpfile(struct xfs_inode *dp, struct dentry *dentry,
+                           umode_t mode);
 int             xfs_remove(struct xfs_inode *dp, struct xfs_name *name,
                            struct xfs_inode *ip);
 int             xfs_link(struct xfs_inode *tdp, struct xfs_inode *sip,
diff --git a/fs/xfs/xfs_iops.c b/fs/xfs/xfs_iops.c
index 0ce1d759156e..cb06cc4d0003 100644
--- a/fs/xfs/xfs_iops.c
+++ b/fs/xfs/xfs_iops.c
@@ -39,6 +39,7 @@
 #include "xfs_da_btree.h"
 #include "xfs_dir2_priv.h"
 #include "xfs_dinode.h"
+#include "xfs_trans_space.h"
 
 #include <linux/capability.h>
 #include <linux/xattr.h>
@@ -1043,6 +1044,19 @@ xfs_vn_fiemap(
         return 0;
 }
 
+STATIC int
+xfs_vn_tmpfile(
+        struct inode    *dir,
+        struct dentry   *dentry,
+        umode_t         mode)
+{
+        int             error;
+
+        error = xfs_create_tmpfile(XFS_I(dir), dentry, mode);
+
+        return -error;
+}
+
 static const struct inode_operations xfs_inode_operations = {
         .get_acl                = xfs_get_acl,
         .getattr                = xfs_vn_getattr,
@@ -1079,6 +1093,7 @@ static const struct inode_operations xfs_dir_inode_operations = {
         .removexattr            = generic_removexattr,
         .listxattr              = xfs_vn_listxattr,
         .update_time            = xfs_vn_update_time,
+        .tmpfile                = xfs_vn_tmpfile,
 };
 
 static const struct inode_operations xfs_dir_ci_inode_operations = {
@@ -1105,6 +1120,7 @@ static const struct inode_operations xfs_dir_ci_inode_operations = {
         .removexattr            = generic_removexattr,
         .listxattr              = xfs_vn_listxattr,
         .update_time            = xfs_vn_update_time,
+        .tmpfile                = xfs_vn_tmpfile,
 };
 
 static const struct inode_operations xfs_symlink_inode_operations = {
diff --git a/fs/xfs/xfs_shared.h b/fs/xfs/xfs_shared.h
index 8c5035a13df1..4484e5151395 100644
--- a/fs/xfs/xfs_shared.h
+++ b/fs/xfs/xfs_shared.h
@@ -104,7 +104,8 @@ extern const struct xfs_buf_ops xfs_symlink_buf_ops;
 #define XFS_TRANS_SB_COUNT              41
 #define XFS_TRANS_CHECKPOINT            42
 #define XFS_TRANS_ICREATE               43
-#define XFS_TRANS_TYPE_MAX              43
+#define XFS_TRANS_CREATE_TMPFILE        44
+#define XFS_TRANS_TYPE_MAX              44
 /* new transaction types need to be reflected in xfs_logprint(8) */
 
 #define XFS_TRANS_TYPES \
@@ -112,6 +113,7 @@ extern const struct xfs_buf_ops xfs_symlink_buf_ops;
         { XFS_TRANS_SETATTR_SIZE,       "SETATTR_SIZE" }, \
         { XFS_TRANS_INACTIVE,           "INACTIVE" }, \
         { XFS_TRANS_CREATE,             "CREATE" }, \
+        { XFS_TRANS_CREATE_TMPFILE,     "CREATE_TMPFILE" }, \
         { XFS_TRANS_CREATE_TRUNC,       "CREATE_TRUNC" }, \
         { XFS_TRANS_TRUNCATE_FILE,      "TRUNCATE_FILE" }, \
         { XFS_TRANS_REMOVE,             "REMOVE" }, \
diff --git a/fs/xfs/xfs_trans_resv.c b/fs/xfs/xfs_trans_resv.c
index 2fd59c0dae66..bd3b4b7831b7 100644
--- a/fs/xfs/xfs_trans_resv.c
+++ b/fs/xfs/xfs_trans_resv.c
@@ -229,6 +229,18 @@ xfs_calc_link_reservation(
 }
 
 /*
+ * For adding an inode to unlinked list we can modify:
+ *    the agi hash list: sector size
+ *    the unlinked inode: inode size
+ */
+STATIC uint
+xfs_calc_iunlink_add_reservation(xfs_mount_t *mp)
+{
+        return xfs_calc_buf_res(1, mp->m_sb.sb_sectsize) +
+                xfs_calc_inode_res(mp, 1);
+}
+
+/*
  * For removing a directory entry we can modify:
  *    the parent directory inode: inode size
  *    the removed inode: inode size
@@ -245,10 +257,11 @@ xfs_calc_remove_reservation(
         struct xfs_mount        *mp)
 {
         return XFS_DQUOT_LOGRES(mp) +
-                MAX((xfs_calc_inode_res(mp, 2) +
+                xfs_calc_iunlink_add_reservation(mp) +
+                MAX((xfs_calc_inode_res(mp, 1) +
                      xfs_calc_buf_res(XFS_DIROP_LOG_COUNT(mp),
                                       XFS_FSB_TO_B(mp, 1))),
-                    (xfs_calc_buf_res(5, mp->m_sb.sb_sectsize) +
+                    (xfs_calc_buf_res(4, mp->m_sb.sb_sectsize) +
                      xfs_calc_buf_res(XFS_ALLOCFREE_LOG_COUNT(mp, 2),
                                       XFS_FSB_TO_B(mp, 1))));
 }
@@ -343,6 +356,20 @@ xfs_calc_create_reservation(
 
 }
 
+STATIC uint
+xfs_calc_create_tmpfile_reservation(
+        struct xfs_mount        *mp)
+{
+        uint    res = XFS_DQUOT_LOGRES(mp);
+
+        if (xfs_sb_version_hascrc(&mp->m_sb))
+                res += xfs_calc_icreate_resv_alloc(mp);
+        else
+                res += xfs_calc_create_resv_alloc(mp);
+
+        return res + xfs_calc_iunlink_add_reservation(mp);
+}
+
 /*
  * Making a new directory is the same as creating a new file.
  */
@@ -729,6 +756,11 @@ xfs_trans_resv_calc(
         resp->tr_create.tr_logcount = XFS_CREATE_LOG_COUNT;
         resp->tr_create.tr_logflags |= XFS_TRANS_PERM_LOG_RES;
 
+        resp->tr_create_tmpfile.tr_logres =
+                        xfs_calc_create_tmpfile_reservation(mp);
+        resp->tr_create_tmpfile.tr_logcount = XFS_CREATE_TMPFILE_LOG_COUNT;
+        resp->tr_create_tmpfile.tr_logflags |= XFS_TRANS_PERM_LOG_RES;
+
         resp->tr_mkdir.tr_logres = xfs_calc_mkdir_reservation(mp);
         resp->tr_mkdir.tr_logcount = XFS_MKDIR_LOG_COUNT;
         resp->tr_mkdir.tr_logflags |= XFS_TRANS_PERM_LOG_RES;
diff --git a/fs/xfs/xfs_trans_resv.h b/fs/xfs/xfs_trans_resv.h
index de7de9aaad8a..285621d583f0 100644
--- a/fs/xfs/xfs_trans_resv.h
+++ b/fs/xfs/xfs_trans_resv.h
@@ -38,6 +38,7 @@ struct xfs_trans_resv {
         struct xfs_trans_res    tr_remove;      /* unlink trans */
         struct xfs_trans_res    tr_symlink;     /* symlink trans */
         struct xfs_trans_res    tr_create;      /* create trans */
+        struct xfs_trans_res    tr_create_tmpfile; /* create O_TMPFILE trans */
         struct xfs_trans_res    tr_mkdir;       /* mkdir trans */
         struct xfs_trans_res    tr_ifree;       /* inode free trans */
         struct xfs_trans_res    tr_ichange;     /* inode update trans */
@@ -100,6 +101,7 @@ struct xfs_trans_resv {
 #define XFS_ITRUNCATE_LOG_COUNT         2
 #define XFS_INACTIVE_LOG_COUNT          2
 #define XFS_CREATE_LOG_COUNT            2
+#define XFS_CREATE_TMPFILE_LOG_COUNT    2
 #define XFS_MKDIR_LOG_COUNT             3
 #define XFS_SYMLINK_LOG_COUNT           3
 #define XFS_REMOVE_LOG_COUNT            2