char *mft_name;
};
-#define MDS_MAX_CLIENTS 1024
+/* This limit is arbitrary, but for now we fit it in 1 page (32k clients) */
+#define MDS_MAX_CLIENTS (PAGE_SIZE * 8)
#define MDS_MAX_CLIENT_WORDS (MDS_MAX_CLIENTS / sizeof(unsigned long))
static unsigned long last_rcvd_slots[MDS_MAX_CLIENT_WORDS];
+#define LAST_RCVD "last_rcvd"
+
/* Add client data to the MDS. We use a bitmap to locate a free space
* in the last_rcvd file if cl_off is -1 (i.e. a new client).
* Otherwise, we have just read the data from the last_rcvd file and
* we know its offset.
*/
-int mds_client_add(struct mds_export_data *med, int cl_off)
+int mds_client_add(struct mds_obd *mds, struct mds_export_data *med, int cl_off)
{
- if (cl_off == -1) {
- unsigned long *word;
- int bit;
+ int new_client = (cl_off == -1);
+ /* the bitmap operations can handle cl_off > sizeof(long) * 8, so
+ * there's no need for extra complication here
+ */
+ if (new_client) {
+ cl_off = find_first_zero_bit(last_rcvd_slots, MDS_MAX_CLIENTS);
repeat:
- word = last_rcvd_slots;
- while(*word == ~0UL)
- ++word;
- if (word - last_rcvd_slots >= MDS_MAX_CLIENT_WORDS) {
+ if (cl_off >= MDS_MAX_CLIENTS) {
CERROR("no room for clients - fix MDS_MAX_CLIENTS\n");
return -ENOMEM;
}
- bit = ffz(*word);
- if (test_and_set_bit(bit, word)) {
- CERROR("found bit %d set for word %d - fix locking\n",
- bit, word - last_rcvd_slots);
- LBUG();
+ if (test_and_set_bit(cl_off, last_rcvd_slots)) {
+ CERROR("MDS client %d: found bit is set in bitmap\n",
+ cl_off);
+ cl_off = find_next_zero_bit(last_rcvd_slots,
+ MDS_MAX_CLIENTS, cl_off);
goto repeat;
}
- cl_off = (word - last_rcvd_slots) * sizeof(unsigned long) + bit;
} else {
- /* test_and_set_bit can handle cl_off > sizeof(long), so there's
- * no need to frob it */
if (test_and_set_bit(cl_off, last_rcvd_slots)) {
- CERROR("bit %d already set in bitmap - bad bad\n",
+ CERROR("MDS client %d: bit already set in bitmap!!\n",
cl_off);
LBUG();
}
cl_off, med->med_mcd->mcd_uuid);
med->med_off = cl_off;
+
+ if (new_client) {
+ struct obd_run_ctxt saved;
+ loff_t off = MDS_LR_CLIENT + (cl_off * MDS_LR_SIZE);
+ ssize_t written;
+
+ push_ctxt(&saved, &mds->mds_ctxt, NULL);
+ written = lustre_fwrite(mds->mds_rcvd_filp,
+ (char *)med->med_mcd,
+ sizeof(*med->med_mcd), &off);
+ pop_ctxt(&saved, &mds->mds_ctxt, NULL);
+
+ if (written != sizeof(*med->med_mcd)) {
+ if (written < 0)
+ RETURN(written);
+ RETURN(-EIO);
+ }
+ }
return 0;
}
int mds_client_free(struct obd_export *exp)
{
struct mds_export_data *med = &exp->exp_mds_data;
- unsigned long *word;
- int bit;
+ struct mds_obd *mds = &exp->exp_obd->u.mds;
+ struct mds_client_data zero_mcd;
+ struct obd_run_ctxt saved;
+ int written;
+ loff_t off;
if (!med->med_mcd)
RETURN(0);
CDEBUG(D_INFO, "freeing client at offset %d with UUID '%s'\n",
med->med_off, med->med_mcd->mcd_uuid);
- word = last_rcvd_slots + med->med_off / sizeof(unsigned long);
- bit = med->med_off % sizeof(unsigned long);
+ if (!test_and_clear_bit(med->med_off, last_rcvd_slots)) {
+ CERROR("MDS client %d: bit already clear in bitmap!!\n",
+ med->med_off);
+ LBUG();
+ }
- if (!test_and_clear_bit(bit, word)) {
- CERROR("bit %d already clear in word %d - bad bad\n",
- bit, word - last_rcvd_slots);
+ off = med->med_off;
+
+ memset(&zero_mcd, 0, sizeof zero_mcd);
+ push_ctxt(&saved, &mds->mds_ctxt, NULL);
+ written = lustre_fwrite(mds->mds_rcvd_filp, (const char *)&zero_mcd,
+ sizeof zero_mcd, &off);
+ pop_ctxt(&saved, &mds->mds_ctxt, NULL);
+
+ if (written != sizeof zero_mcd) {
+ CERROR("error zeroing out client %s off %d in %s: %d\n",
+ med->med_mcd->mcd_uuid, med->med_off, LAST_RCVD,
+ written);
LBUG();
+ } else {
+ CDEBUG(D_INFO, "zeroed out disconnecting client %s at off %d\n",
+ med->med_mcd->mcd_uuid, med->med_off);
}
OBD_FREE(med->med_mcd, sizeof(*med->med_mcd));
return 0;
}
-#define LAST_RCVD "last_rcvd"
-
static int mds_read_last_rcvd(struct obd_device *obddev, struct file *f)
{
struct mds_obd *mds = &obddev->u.mds;
struct mds_server_data *msd;
struct mds_client_data *mcd = NULL;
- loff_t fsize = f->f_dentry->d_inode->i_size;
loff_t off = 0;
int cl_off;
+ int max_off = f->f_dentry->d_inode->i_size / sizeof(*mcd);
__u64 last_rcvd = 0;
__u64 last_mount;
- int clients = 0;
int rc = 0;
OBD_ALLOC(msd, sizeof(*msd));
CDEBUG(D_INODE, "got %Lu for server last_mount value\n",
(unsigned long long)last_mount);
- for (off = MDS_LR_CLIENT, cl_off = 0, rc = sizeof(*mcd);
- off <= fsize - sizeof(*mcd) && rc == sizeof(*mcd);
- off = MDS_LR_CLIENT + ++cl_off * MDS_LR_SIZE) {
+ for (off = MDS_LR_CLIENT, cl_off = 0;
+ off < max_off;
+ off += MDS_LR_SIZE, cl_off++) {
+ int mount_age;
+
if (!mcd) {
OBD_ALLOC(mcd, sizeof(*mcd));
if (!mcd)
break;
}
+ if (mcd->mcd_uuid[0] == '\0') {
+ CDEBUG(D_INFO, "skipping zeroed client at offset %d\n",
+ cl_off);
+ continue;
+ }
+
last_rcvd = le64_to_cpu(mcd->mcd_last_rcvd);
- /* Do client recovery here (open files, etc) */
- if (last_rcvd && (last_mount - le64_to_cpu(mcd->mcd_mount_count)
- < MDS_MOUNT_RECOV)) {
- struct obd_export *export = class_new_export(obddev);
- if (!export) {
+ /* The exports are cleaned up by mds_disconnect, so they
+ * need to be set up like real exports also.
+ */
+ mount_age = last_mount - le64_to_cpu(mcd->mcd_mount_count);
+ if (last_rcvd && mount_age < MDS_MOUNT_RECOV) {
+ struct obd_export *exp = class_new_export(obddev);
+ struct mds_export_data *med;
+
+ if (!exp) {
rc = -ENOMEM;
break;
}
- export->exp_mds_data.med_mcd = mcd;
- mds_client_add(&export->exp_mds_data, cl_off);
+
+ med = &exp->exp_mds_data;
+ med->med_mcd = mcd;
+ mds_client_add(mds, med, cl_off);
+ /* XXX put this in a helper if it gets more complex */
+ INIT_LIST_HEAD(&med->med_open_head);
+ spin_lock_init(&med->med_open_lock);
+
mcd = NULL;
- clients++;
+ mds->mds_recoverable_clients++;
+ MOD_INC_USE_COUNT;
} else {
CDEBUG(D_INFO,
- "ignored client %d, UUID '%s', last_mount %Ld\n",
+ "discarded client %d, UUID '%s', count %Ld\n",
cl_off, mcd->mcd_uuid,
(long long)le64_to_cpu(mcd->mcd_mount_count));
}
mds->mds_last_rcvd = last_rcvd;
}
}
- CDEBUG(D_INODE, "got %Lu for highest last_rcvd value, %d/%d clients\n",
- (unsigned long long)mds->mds_last_rcvd, clients, cl_off);
+
+ mds->mds_last_committed = mds->mds_last_rcvd;
+ if (mds->mds_recoverable_clients) {
+ CERROR("need recovery: %d recoverable clients, last_rcvd %Lu\n",
+ mds->mds_recoverable_clients, mds->mds_last_rcvd);
+ }
if (mcd)
OBD_FREE(mcd, sizeof(*mcd));
- /* After recovery, there can be no local uncommitted transactions */
- mds->mds_last_committed = mds->mds_last_rcvd;
-
return 0;
err_msd:
struct file *f;
int rc;
- push_ctxt(&saved, &mds->mds_ctxt);
+ push_ctxt(&saved, &mds->mds_ctxt, NULL);
dentry = simple_mkdir(current->fs->pwd, "ROOT", 0755);
if (IS_ERR(dentry)) {
rc = PTR_ERR(dentry);
}
mds->mds_rcvd_filp = f;
err_pop:
- pop_ctxt(&saved);
+ pop_ctxt(&saved, &mds->mds_ctxt, NULL);
return rc;
git://git.whamcloud.com / fs / lustre-release.git / blobdiff