xfs: support creating per-RTG files in growfs

To support adding new RT groups in growfs, we need to be able to create
the per-RT group files.  Add a new xfs_rtginode_create helper to create
a given per-RTG file.  Most of the code for that is shared, but the
details of the actual file are abstracted out using a new create method
in struct xfs_rtginode_ops.

[Note: this could probably move significantly later in the series]
Signed-off-by: Christoph Hellwig <hch@lst.de>

diff --git a/fs/xfs/libxfs/xfs_rtbitmap.c b/fs/xfs/libxfs/xfs_rtbitmap.c
index c54ac160b9099473b039d8ad34a650703e0bc571..6c3354c8efdafae966f49ad4f774583144c7cffa 100644 (file)
--- a/fs/xfs/libxfs/xfs_rtbitmap.c
+++ b/fs/xfs/libxfs/xfs_rtbitmap.c
@@ -1297,3 +1297,35 @@ xfs_rtfile_initialize_blocks(
 
        return 0;
 }
+
+int
+xfs_rtbitmap_create(
+       struct xfs_rtgroup      *rtg,
+       struct xfs_inode        *ip,
+       struct xfs_trans        *tp,
+       bool                    init)
+{
+       struct xfs_mount        *mp = rtg_mount(rtg);
+
+       ip->i_disk_size = mp->m_sb.sb_rbmblocks * mp->m_sb.sb_blocksize;
+       if (init && !xfs_has_rtgroups(mp)) {
+               ip->i_diflags |= XFS_DIFLAG_NEWRTBM;
+               inode_set_atime(VFS_I(ip), 0, 0);
+       }
+       xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
+       return 0;
+}
+
+int
+xfs_rtsummary_create(
+       struct xfs_rtgroup      *rtg,
+       struct xfs_inode        *ip,
+       struct xfs_trans        *tp,
+       bool                    init)
+{
+       struct xfs_mount        *mp = rtg_mount(rtg);
+
+       ip->i_disk_size = mp->m_rsumblocks * mp->m_sb.sb_blocksize;
+       xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
+       return 0;
+}

diff --git a/fs/xfs/libxfs/xfs_rtbitmap.h b/fs/xfs/libxfs/xfs_rtbitmap.h
index b3cbc56aa255ed44829f09da472bed848295f0c8..e4994a3e461d33810fab4376165684f2cbf9c1f1 100644 (file)
--- a/fs/xfs/libxfs/xfs_rtbitmap.h
+++ b/fs/xfs/libxfs/xfs_rtbitmap.h
@@ -315,6 +315,10 @@ xfs_filblks_t xfs_rtsummary_blockcount(struct xfs_mount *mp,
 int xfs_rtfile_initialize_blocks(struct xfs_rtgroup *rtg,
                enum xfs_rtg_inodes type, xfs_fileoff_t offset_fsb,
                xfs_fileoff_t end_fsb, void *data);
+int xfs_rtbitmap_create(struct xfs_rtgroup *rtg, struct xfs_inode *ip,
+               struct xfs_trans *tp, bool init);
+int xfs_rtsummary_create(struct xfs_rtgroup *rtg, struct xfs_inode *ip,
+               struct xfs_trans *tp, bool init);
 
 #else /* CONFIG_XFS_RT */
 # define xfs_rtfree_extent(t,b,l)                      (-ENOSYS)

diff --git a/fs/xfs/libxfs/xfs_rtgroup.c b/fs/xfs/libxfs/xfs_rtgroup.c
index cc4ff8c4bdfbf52c777e69a166db8e8d3e059ed9..de2070daf870922f818adf4ac3e2dfb55db660de 100644 (file)
--- a/fs/xfs/libxfs/xfs_rtgroup.c
+++ b/fs/xfs/libxfs/xfs_rtgroup.c
@@ -239,16 +239,24 @@ struct xfs_rtginode_ops {
 
        /* Does the fs have this feature? */
        bool                    (*enabled)(struct xfs_mount *mp);
+
+       /* Create this rtgroup metadata inode and initialize it. */
+       int                     (*create)(struct xfs_rtgroup *rtg,
+                                         struct xfs_inode *ip,
+                                         struct xfs_trans *tp,
+                                         bool init);
 };
 
 static const struct xfs_rtginode_ops xfs_rtginode_ops[XFS_RTGI_MAX] = {
        [XFS_RTGI_BITMAP] = {
                .name           = "bitmap",
                .metafile_type  = XFS_METAFILE_RTBITMAP,
+               .create         = xfs_rtbitmap_create,
        },
        [XFS_RTGI_SUMMARY] = {
                .name           = "summary",
                .metafile_type  = XFS_METAFILE_RTSUMMARY,
+               .create         = xfs_rtsummary_create,
        },
 };
 
@@ -356,6 +364,67 @@ xfs_rtginode_irele(
        *ipp = NULL;
 }
 
+/* Add a metadata inode for a realtime rmap btree. */
+int
+xfs_rtginode_create(
+       struct xfs_rtgroup              *rtg,
+       enum xfs_rtg_inodes             type,
+       bool                            init)
+{
+       const struct xfs_rtginode_ops   *ops = &xfs_rtginode_ops[type];
+       struct xfs_mount                *mp = rtg_mount(rtg);
+       struct xfs_metadir_update       upd = {
+               .dp                     = mp->m_rtdirip,
+               .metafile_type          = ops->metafile_type,
+       };
+       int                             error;
+
+       if (!xfs_rtginode_enabled(rtg, type))
+               return 0;
+
+       if (!mp->m_rtdirip)
+               return -EFSCORRUPTED;
+
+       upd.path = xfs_rtginode_path(rtg_rgno(rtg), type);
+       if (!upd.path)
+               return -ENOMEM;
+
+       error = xfs_metadir_start_create(&upd);
+       if (error)
+               goto out_path;
+
+       error = xfs_metadir_create(&upd, S_IFREG);
+       if (error)
+               return error;
+
+       xfs_rtginode_lockdep_setup(upd.ip, rtg_rgno(rtg), type);
+
+       upd.ip->i_projid = rtg_rgno(rtg);
+       error = ops->create(rtg, upd.ip, upd.tp, init);
+       if (error)
+               goto out_cancel;
+
+       error = xfs_metadir_commit(&upd);
+       if (error)
+               goto out_path;
+
+       kfree(upd.path);
+       xfs_finish_inode_setup(upd.ip);
+       rtg->rtg_inodes[type] = upd.ip;
+       return 0;
+
+out_cancel:
+       xfs_metadir_cancel(&upd, error);
+       /* Have to finish setting up the inode to ensure it's deleted. */
+       if (upd.ip) {
+               xfs_finish_inode_setup(upd.ip);
+               xfs_irele(upd.ip);
+       }
+out_path:
+       kfree(upd.path);
+       return error;
+}
+
 /* Create the parent directory for all rtgroup inodes and load it. */
 int
 xfs_rtginode_mkdir_parent(

diff --git a/fs/xfs/libxfs/xfs_rtgroup.h b/fs/xfs/libxfs/xfs_rtgroup.h
index 37ea4b851b5b38d21ab53b7e157323ec695b3697..19097b571ad74c5878b5cd943b23ee60461a0e9a 100644 (file)
--- a/fs/xfs/libxfs/xfs_rtgroup.h
+++ b/fs/xfs/libxfs/xfs_rtgroup.h
@@ -231,6 +231,8 @@ enum xfs_metafile_type xfs_rtginode_metafile_type(enum xfs_rtg_inodes type);
 bool xfs_rtginode_enabled(struct xfs_rtgroup *rtg, enum xfs_rtg_inodes type);
 int xfs_rtginode_load(struct xfs_rtgroup *rtg, enum xfs_rtg_inodes type,
                struct xfs_trans *tp);
+int xfs_rtginode_create(struct xfs_rtgroup *rtg, enum xfs_rtg_inodes type,
+               bool init);
 void xfs_rtginode_irele(struct xfs_inode **ipp);
 
 static inline const char *xfs_rtginode_path(xfs_rgnumber_t rgno,

diff --git a/fs/xfs/xfs_rtalloc.c b/fs/xfs/xfs_rtalloc.c
index 7d7dd057f057f12386612675bcc1c7f5ae25bc13..42c9d3bb71b06b803d49d836b04c81931a05bf93 100644 (file)
--- a/fs/xfs/xfs_rtalloc.c
+++ b/fs/xfs/xfs_rtalloc.c
@@ -711,6 +711,29 @@ out_iolock:
        return error;
 }
 
+/* Ensure that the rtgroup metadata inode is loaded, creating it if neeeded. */
+static int
+xfs_rtginode_ensure(
+       struct xfs_rtgroup      *rtg,
+       enum xfs_rtg_inodes     type)
+{
+       struct xfs_trans        *tp;
+       int                     error;
+
+       if (rtg->rtg_inodes[type])
+               return 0;
+
+       error = xfs_trans_alloc_empty(rtg_mount(rtg), &tp);
+       if (error)
+               return error;
+       error = xfs_rtginode_load(rtg, type, tp);
+       xfs_trans_cancel(tp);
+
+       if (error != -ENOENT)
+               return 0;
+       return xfs_rtginode_create(rtg, type, true);
+}
+
 static int
 xfs_growfs_rt_bmblock(
        struct xfs_rtgroup      *rtg,
@@ -927,12 +950,19 @@ xfs_growfs_rtg(
        xfs_extlen_t            bmblocks;
        xfs_fileoff_t           bmbno;
        struct xfs_rtgroup      *rtg;
+       unsigned int            i;
        int                     error;
 
        rtg = xfs_rtgroup_grab(mp, 0);
        if (!rtg)
                return -EINVAL;
 
+       for (i = 0; i < XFS_RTGI_MAX; i++) {
+               error = xfs_rtginode_ensure(rtg, i);
+               if (error)
+                       goto out_rele;
+       }
+
        error = xfs_growfs_rt_alloc_blocks(rtg, nrblocks, rextsize, &bmblocks);
        if (error)
                goto out_rele;