#define EXOFS_ROOT_ID 0x10002 /* object ID for root directory */
/* exofs Application specific page/attribute */
+/* Inode attrs */
# define EXOFS_APAGE_FS_DATA (OSD_APAGE_APP_DEFINED_FIRST + 3)
# define EXOFS_ATTR_INODE_DATA 1
# define EXOFS_ATTR_INODE_FILE_LAYOUT 2
# define EXOFS_ATTR_INODE_DIR_LAYOUT 3
+/* Partition attrs */
+# define EXOFS_APAGE_SB_DATA (0xF0000000U + 3)
+# define EXOFS_ATTR_SB_STATS 1
/*
* The maximum number of files we can have is limited by the size of the
*/
enum {EXOFS_FSCB_VER = 1, EXOFS_DT_VER = 1};
struct exofs_fscb {
- __le64 s_nextid; /* Highest object ID used */
- __le64 s_numfiles; /* Number of files on fs */
+ __le64 s_nextid; /* Only used after mkfs */
+ __le64 s_numfiles; /* Only used after mkfs */
__le32 s_version; /* == EXOFS_FSCB_VER */
__le16 s_magic; /* Magic signature */
__le16 s_newfs; /* Non-zero if this is a new fs */
__le64 s_dev_table_count; /* == 0 means no dev_table */
} __packed;
+/*
+ * This struct is set on the FS partition's attributes.
+ * [EXOFS_APAGE_SB_DATA, EXOFS_ATTR_SB_STATS] and is written together
+ * with the create command, to atomically persist the sb writeable information.
+ */
+struct exofs_sb_stats {
+ __le64 s_nextid; /* Highest object ID used */
+ __le64 s_numfiles; /* Number of files on fs */
+} __packed;
+
/*
* Describes the raid used in the FS. It is part of the device table.
* This here is taken from the pNFS-objects definition. In exofs we
static const struct super_operations exofs_sops;
static const struct export_operations exofs_export_ops;
+static const struct osd_attr g_attr_sb_stats = ATTR_DEF(
+ EXOFS_APAGE_SB_DATA,
+ EXOFS_ATTR_SB_STATS,
+ sizeof(struct exofs_sb_stats));
+
+static int __sbi_read_stats(struct exofs_sb_info *sbi)
+{
+ struct osd_attr attrs[] = {
+ [0] = g_attr_sb_stats,
+ };
+ struct exofs_io_state *ios;
+ int ret;
+
+ ret = exofs_get_io_state(&sbi->layout, &ios);
+ if (unlikely(ret)) {
+ EXOFS_ERR("%s: exofs_get_io_state failed.\n", __func__);
+ return ret;
+ }
+
+ ios->cred = sbi->s_cred;
+
+ ios->in_attr = attrs;
+ ios->in_attr_len = ARRAY_SIZE(attrs);
+
+ ret = exofs_sbi_read(ios);
+ if (unlikely(ret)) {
+ EXOFS_ERR("Error reading super_block stats => %d\n", ret);
+ goto out;
+ }
+
+ ret = extract_attr_from_ios(ios, &attrs[0]);
+ if (ret) {
+ EXOFS_ERR("%s: extract_attr of sb_stats failed\n", __func__);
+ goto out;
+ }
+ if (attrs[0].len) {
+ struct exofs_sb_stats *ess;
+
+ if (unlikely(attrs[0].len != sizeof(*ess))) {
+ EXOFS_ERR("%s: Wrong version of exofs_sb_stats "
+ "size(%d) != expected(%zd)\n",
+ __func__, attrs[0].len, sizeof(*ess));
+ goto out;
+ }
+
+ ess = attrs[0].val_ptr;
+ sbi->s_nextid = le64_to_cpu(ess->s_nextid);
+ sbi->s_numfiles = le32_to_cpu(ess->s_numfiles);
+ }
+
+out:
+ exofs_put_io_state(ios);
+ return ret;
+}
+
+static void stats_done(struct exofs_io_state *ios, void *p)
+{
+ exofs_put_io_state(ios);
+ /* Good thanks nothing to do anymore */
+}
+
+/* Asynchronously write the stats attribute */
+int exofs_sbi_write_stats(struct exofs_sb_info *sbi)
+{
+ struct osd_attr attrs[] = {
+ [0] = g_attr_sb_stats,
+ };
+ struct exofs_io_state *ios;
+ int ret;
+
+ ret = exofs_get_io_state(&sbi->layout, &ios);
+ if (unlikely(ret)) {
+ EXOFS_ERR("%s: exofs_get_io_state failed.\n", __func__);
+ return ret;
+ }
+
+ sbi->s_ess.s_nextid = cpu_to_le64(sbi->s_nextid);
+ sbi->s_ess.s_numfiles = cpu_to_le64(sbi->s_numfiles);
+ attrs[0].val_ptr = &sbi->s_ess;
+
+ ios->cred = sbi->s_cred;
+ ios->done = stats_done;
+ ios->private = sbi;
+ ios->out_attr = attrs;
+ ios->out_attr_len = ARRAY_SIZE(attrs);
+
+ ret = exofs_sbi_write(ios);
+ if (unlikely(ret)) {
+ EXOFS_ERR("%s: exofs_sbi_write failed.\n", __func__);
+ exofs_put_io_state(ios);
+ }
+
+ return ret;
+}
+
/*
* Write the superblock to the OSD
*/
struct exofs_io_state *ios;
int ret = -ENOMEM;
- lock_super(sb);
+ fscb = kmalloc(sizeof(*fscb), GFP_KERNEL);
+ if (unlikely(!fscb))
+ return -ENOMEM;
+
sbi = sb->s_fs_info;
- fscb = &sbi->s_fscb;
+ /* NOTE: We no longer dirty the super_block anywhere in exofs. The
+ * reason we write the fscb here on unmount is so we can stay backwards
+ * compatible with fscb->s_version == 1. (What we are not compatible
+ * with is if a new version FS crashed and then we try to mount an old
+ * version). Otherwise the exofs_fscb is read-only from mkfs time. All
+ * the writeable info is set in exofs_sbi_write_stats() above.
+ */
ret = exofs_get_io_state(&sbi->layout, &ios);
- if (ret)
+ if (unlikely(ret))
goto out;
- /* Note: We only write the changing part of the fscb. .i.e upto the
- * the fscb->s_dev_table_oid member. There is no read-modify-write
- * here.
- */
+ lock_super(sb);
+
ios->length = offsetof(struct exofs_fscb, s_dev_table_oid);
memset(fscb, 0, ios->length);
fscb->s_nextid = cpu_to_le64(sbi->s_nextid);
ios->cred = sbi->s_cred;
ret = exofs_sbi_write(ios);
- if (unlikely(ret)) {
+ if (unlikely(ret))
EXOFS_ERR("%s: exofs_sbi_write failed.\n", __func__);
- goto out;
- }
- sb->s_dirt = 0;
+ else
+ sb->s_dirt = 0;
+
+ unlock_super(sb);
out:
EXOFS_DBGMSG("s_nextid=0x%llx ret=%d\n", _LLU(sbi->s_nextid), ret);
exofs_put_io_state(ios);
- unlock_super(sb);
+ kfree(fscb);
return ret;
}
int num_pend;
struct exofs_sb_info *sbi = sb->s_fs_info;
- if (sb->s_dirt)
- exofs_write_super(sb);
-
/* make sure there are no pending commands */
for (num_pend = atomic_read(&sbi->s_curr_pending); num_pend > 0;
num_pend = atomic_read(&sbi->s_curr_pending)) {
goto free_sbi;
sb->s_magic = le16_to_cpu(fscb.s_magic);
+ /* NOTE: we read below to be backward compatible with old versions */
sbi->s_nextid = le64_to_cpu(fscb.s_nextid);
sbi->s_numfiles = le32_to_cpu(fscb.s_numfiles);
ret = -EINVAL;
goto free_sbi;
}
- if (le32_to_cpu(fscb.s_version) != EXOFS_FSCB_VER) {
+ if (le32_to_cpu(fscb.s_version) > EXOFS_FSCB_VER) {
EXOFS_ERR("ERROR: Bad FSCB version expected-%d got-%d\n",
EXOFS_FSCB_VER, le32_to_cpu(fscb.s_version));
ret = -EINVAL;
goto free_sbi;
}
+ __sbi_read_stats(sbi);
+
/* set up operation vectors */
sbi->bdi.ra_pages = __ra_pages(&sbi->layout);
sb->s_bdi = &sbi->bdi;
projects / cascardo / linux.git / commitdiff