"\n" \
"\tblock: Block file access during data migration\n" \
+static const char *progname;
+static bool file_lease_supported = true;
+
/* all available commands */
command_t cmdlist[] = {
{"setstripe", lfs_setstripe, 0,
{"swap_layouts", lfs_swap_layouts, 0, "Swap layouts between 2 files.\n"
"usage: swap_layouts <path1> <path2>"},
{"migrate", lfs_setstripe, 0, "migrate file from one OST layout to "
- "another (may be not safe with concurrent writes).\n"
- MIGRATE_USAGE},
+ "another.\n" MIGRATE_USAGE},
{"mv", lfs_mv, 0,
"To move directories between MDTs.\n"
"usage: mv <directory|filename> [--mdt-index|-M] <mdt_index> "
{ 0, 0, 0, NULL }
};
+
#define MIGRATION_BLOCKS 1
+/**
+ * Internal helper for migrate_copy_data(). Check lease and report error if
+ * need be.
+ *
+ * \param[in] fd File descriptor on which to check the lease.
+ * \param[out] lease_broken Set to true if the lease was broken.
+ * \param[in] group_locked Whether a group lock was taken or not.
+ * \param[in] path Name of the file being processed, for error
+ * reporting
+ *
+ * \retval 0 Migration can keep on going.
+ * \retval -errno Error occurred, abort migration.
+ */
+static int check_lease(int fd, bool *lease_broken, bool group_locked,
+ const char *path)
+{
+ int rc;
+
+ if (!file_lease_supported)
+ return 0;
+
+ rc = llapi_lease_check(fd);
+ if (rc > 0)
+ return 0; /* llapi_check_lease returns > 0 on success. */
+
+ if (!group_locked) {
+ fprintf(stderr, "%s: cannot migrate '%s': file busy\n",
+ progname, path);
+ rc = rc ? rc : -EAGAIN;
+ } else {
+ fprintf(stderr, "%s: external attempt to access file '%s' "
+ "blocked until migration ends.\n", progname, path);
+ rc = 0;
+ }
+ *lease_broken = true;
+ return rc;
+}
+
+static int migrate_copy_data(int fd_src, int fd_dst, size_t buf_size,
+ bool group_locked, const char *fname)
+{
+ void *buf = NULL;
+ ssize_t rsize = -1;
+ ssize_t wsize = 0;
+ size_t rpos = 0;
+ size_t wpos = 0;
+ off_t bufoff = 0;
+ int rc;
+ bool lease_broken = false;
+
+ /* Use a page-aligned buffer for direct I/O */
+ rc = posix_memalign(&buf, getpagesize(), buf_size);
+ if (rc != 0)
+ return -rc;
+
+ while (1) {
+ /* read new data only if we have written all
+ * previously read data */
+ if (wpos == rpos) {
+ if (!lease_broken) {
+ rc = check_lease(fd_src, &lease_broken,
+ group_locked, fname);
+ if (rc < 0)
+ goto out;
+ }
+ rsize = read(fd_src, buf, buf_size);
+ if (rsize < 0) {
+ rc = -errno;
+ fprintf(stderr, "%s: %s: read failed: %s\n",
+ progname, fname, strerror(-rc));
+ goto out;
+ }
+ rpos += rsize;
+ bufoff = 0;
+ }
+ /* eof ? */
+ if (rsize == 0)
+ break;
+
+ wsize = write(fd_dst, buf + bufoff, rpos - wpos);
+ if (wsize < 0) {
+ rc = -errno;
+ fprintf(stderr,
+ "%s: %s: write failed on volatile: %s\n",
+ progname, fname, strerror(-rc));
+ goto out;
+ }
+ wpos += wsize;
+ bufoff += wsize;
+ }
+
+ rc = fsync(fd_dst);
+ if (rc < 0) {
+ rc = -errno;
+ fprintf(stderr, "%s: %s: fsync failed: %s\n",
+ progname, fname, strerror(-rc));
+ }
+
+out:
+ free(buf);
+ return rc;
+}
+
+static int migrate_copy_timestamps(int fdv, const struct stat *st)
+{
+ struct timeval tv[2] = {
+ {.tv_sec = st->st_atime},
+ {.tv_sec = st->st_mtime}
+ };
+
+ return futimes(fdv, tv);
+}
+
+static int migrate_block(int fd, int fdv, const struct stat *st,
+ size_t buf_size, const char *name)
+{
+ __u64 dv1;
+ int gid;
+ int rc;
+ int rc2;
+
+ rc = llapi_get_data_version(fd, &dv1, LL_DV_RD_FLUSH);
+ if (rc < 0) {
+ fprintf(stderr, "%s: %s: cannot get dataversion: %s\n",
+ progname, name, strerror(-rc));
+ return rc;
+ }
+
+ do
+ gid = random();
+ while (gid == 0);
+
+ /* The grouplock blocks all concurrent accesses to the file.
+ * It has to be taken after llapi_get_data_version as it would
+ * block it too. */
+ rc = llapi_group_lock(fd, gid);
+ if (rc < 0) {
+ fprintf(stderr, "%s: %s: cannot get group lock: %s\n",
+ progname, name, strerror(-rc));
+ return rc;
+ }
+
+ rc = migrate_copy_data(fd, fdv, buf_size, true, name);
+ if (rc < 0) {
+ fprintf(stderr, "%s: %s: data copy failed\n", progname, name);
+ goto out_unlock;
+ }
+
+ /* Make sure we keep original atime/mtime values */
+ rc = migrate_copy_timestamps(fdv, st);
+ if (rc < 0) {
+ fprintf(stderr, "%s: %s: timestamp copy failed\n",
+ progname, name);
+ goto out_unlock;
+ }
+
+ /* swap layouts
+ * for a migration we need to check data version on file did
+ * not change.
+ *
+ * Pass in gid=0 since we already own grouplock. */
+ rc = llapi_fswap_layouts_grouplock(fd, fdv, dv1, 0, 0,
+ SWAP_LAYOUTS_CHECK_DV1);
+ if (rc == -EAGAIN) {
+ fprintf(stderr, "%s: %s: dataversion changed during copy, "
+ "migration aborted\n", progname, name);
+ goto out_unlock;
+ } else if (rc < 0) {
+ fprintf(stderr, "%s: %s: cannot swap layouts: %s\n", progname,
+ name, strerror(-rc));
+ goto out_unlock;
+ }
+
+out_unlock:
+ rc2 = llapi_group_unlock(fd, gid);
+ if (rc2 < 0 && rc == 0) {
+ fprintf(stderr, "%s: %s: putting group lock failed: %s\n",
+ progname, name, strerror(-rc2));
+ rc = rc2;
+ }
+
+ return rc;
+}
+
+static int migrate_nonblock(int fd, int fdv, const struct stat *st,
+ size_t buf_size, const char *name)
+{
+ __u64 dv1;
+ __u64 dv2;
+ int rc;
+
+ rc = llapi_get_data_version(fd, &dv1, LL_DV_RD_FLUSH);
+ if (rc < 0) {
+ fprintf(stderr, "%s: %s: cannot get data version: %s\n",
+ progname, name, strerror(-rc));
+ return rc;
+ }
+
+ rc = migrate_copy_data(fd, fdv, buf_size, false, name);
+ if (rc < 0) {
+ fprintf(stderr, "%s: %s: data copy failed\n", progname, name);
+ return rc;
+ }
+
+ rc = llapi_get_data_version(fd, &dv2, LL_DV_RD_FLUSH);
+ if (rc != 0) {
+ fprintf(stderr, "%s: %s: cannot get data version: %s\n",
+ progname, name, strerror(-rc));
+ return rc;
+ }
+
+ if (dv1 != dv2) {
+ rc = -EAGAIN;
+ fprintf(stderr, "%s: %s: data version changed during "
+ "migration\n",
+ progname, name);
+ return rc;
+ }
+
+ /* Make sure we keep original atime/mtime values */
+ rc = migrate_copy_timestamps(fdv, st);
+ if (rc < 0) {
+ fprintf(stderr, "%s: %s: timestamp copy failed\n",
+ progname, name);
+ return rc;
+ }
+
+ /* Atomically put lease, swap layouts and close.
+ * for a migration we need to check data version on file did
+ * not change. */
+ rc = llapi_fswap_layouts(fd, fdv, 0, 0, SWAP_LAYOUTS_CLOSE);
+ if (rc < 0) {
+ fprintf(stderr, "%s: %s: cannot swap layouts: %s\n",
+ progname, name, strerror(-rc));
+ return rc;
+ }
+
+ return 0;
+}
+
static int lfs_migrate(char *name, __u64 migration_flags,
struct llapi_stripe_param *param)
{
- int fd, fdv;
+ int fd = -1;
+ int fdv = -1;
char volatile_file[PATH_MAX +
LUSTRE_VOLATILE_HDR_LEN + 4];
char parent[PATH_MAX];
char *ptr;
int rc;
- __u64 dv1;
struct lov_user_md *lum = NULL;
- int lumsz;
- int bufsz;
- void *buf = NULL;
- int rsize, wsize;
- __u64 rpos, wpos, bufoff;
- int gid;
- int have_gl = 0;
- struct stat st, stv;
+ int lum_size;
+ int buf_size;
+ bool have_lease_rdlck = false;
+ struct stat st;
+ struct stat stv;
/* find the right size for the IO and allocate the buffer */
- lumsz = lov_user_md_size(LOV_MAX_STRIPE_COUNT, LOV_USER_MAGIC_V3);
- lum = malloc(lumsz);
+ lum_size = lov_user_md_size(LOV_MAX_STRIPE_COUNT, LOV_USER_MAGIC_V3);
+ lum = malloc(lum_size);
if (lum == NULL) {
rc = -ENOMEM;
goto free;
* in case of a real error, a later call will fail with better
* error management */
if (rc < 0)
- bufsz = 1024*1024;
+ buf_size = 1024 * 1024;
else
- bufsz = lum->lmm_stripe_size;
- rc = posix_memalign(&buf, getpagesize(), bufsz);
- if (rc != 0) {
- rc = -rc;
+ buf_size = lum->lmm_stripe_size;
+
+ /* open file, direct io */
+ /* even if the file is only read, WR mode is nedeed to allow
+ * layout swap on fd */
+ fd = open(name, O_RDWR | O_DIRECT);
+ if (fd == -1) {
+ rc = -errno;
+ fprintf(stderr, "%s: %s: cannot open: %s\n", progname, name,
+ strerror(-rc));
goto free;
}
+ if (file_lease_supported) {
+ rc = llapi_lease_get(fd, LL_LEASE_RDLCK);
+ if (rc == -EOPNOTSUPP) {
+ /* Older servers do not support file lease.
+ * Disable related checks. This opens race conditions
+ * as explained in LU-4840 */
+ file_lease_supported = false;
+ } else if (rc < 0) {
+ fprintf(stderr, "%s: %s: cannot get open lease: %s\n",
+ progname, name, strerror(-rc));
+ goto error;
+ } else {
+ have_lease_rdlck = true;
+ }
+ }
+
/* search for file directory pathname */
if (strlen(name) > sizeof(parent)-1) {
rc = -E2BIG;
- goto free;
+ goto error;
}
strncpy(parent, name, sizeof(parent));
ptr = strrchr(parent, '/');
if (ptr == NULL) {
if (getcwd(parent, sizeof(parent)) == NULL) {
rc = -errno;
- goto free;
+ goto error;
}
} else {
if (ptr == parent)
else
*ptr = '\0';
}
+
rc = snprintf(volatile_file, sizeof(volatile_file), "%s/%s::", parent,
LUSTRE_VOLATILE_HDR);
if (rc >= sizeof(volatile_file)) {
rc = -E2BIG;
- goto free;
+ goto error;
}
/* create, open a volatile file, use caching (ie no directio) */
param);
if (fdv < 0) {
rc = fdv;
- fprintf(stderr, "cannot create volatile file in %s (%s)\n",
- parent, strerror(-rc));
- goto free;
- }
-
- /* open file, direct io */
- /* even if the file is only read, WR mode is nedeed to allow
- * layout swap on fd */
- fd = open(name, O_RDWR | O_DIRECT);
- if (fd == -1) {
- rc = -errno;
- fprintf(stderr, "cannot open %s (%s)\n", name, strerror(-rc));
- close(fdv);
- goto free;
+ fprintf(stderr, "%s: %s: cannot create volatile file in"
+ " directory: %s\n",
+ progname, parent, strerror(-rc));
+ goto error;
}
/* Not-owner (root?) special case.
rc = fstat(fd, &st);
if (rc != 0) {
rc = -errno;
- fprintf(stderr, "cannot stat %s (%s)\n", name,
+ fprintf(stderr, "%s: %s: cannot stat: %s\n", progname, name,
strerror(errno));
goto error;
}
rc = fstat(fdv, &stv);
if (rc != 0) {
rc = -errno;
- fprintf(stderr, "cannot stat %s (%s)\n", volatile_file,
- strerror(errno));
+ fprintf(stderr, "%s: %s: cannot stat: %s\n", progname,
+ volatile_file, strerror(errno));
goto error;
}
if (st.st_uid != stv.st_uid || st.st_gid != stv.st_gid) {
rc = fchown(fdv, st.st_uid, st.st_gid);
if (rc != 0) {
rc = -errno;
- fprintf(stderr, "cannot chown %s (%s)\n", name,
- strerror(errno));
- goto error;
- }
- }
-
- /* get file data version */
- rc = llapi_get_data_version(fd, &dv1, LL_DV_RD_FLUSH);
- if (rc != 0) {
- fprintf(stderr, "cannot get dataversion on %s (%s)\n",
- name, strerror(-rc));
- goto error;
- }
-
- do
- gid = random();
- while (gid == 0);
- if (migration_flags & MIGRATION_BLOCKS) {
- /* take group lock to limit concurrent access
- * this will be no more needed when exclusive access will
- * be implemented (see LU-2919) */
- /* group lock is taken after data version read because it
- * blocks data version call */
- rc = llapi_group_lock(fd, gid);
- if (rc < 0) {
- fprintf(stderr, "cannot get group lock on %s (%s)\n",
- name, strerror(-rc));
+ fprintf(stderr, "%s: %s: cannot chown: %s\n", progname,
+ name, strerror(errno));
goto error;
}
- have_gl = 1;
}
- /* copy data */
- rpos = 0;
- wpos = 0;
- bufoff = 0;
- rsize = -1;
- do {
- /* read new data only if we have written all
- * previously read data */
- if (wpos == rpos) {
- rsize = read(fd, buf, bufsz);
- if (rsize < 0) {
- rc = -errno;
- fprintf(stderr, "read failed on %s"
- " (%s)\n", name,
- strerror(-rc));
- goto error;
- }
- rpos += rsize;
- bufoff = 0;
- }
- /* eof ? */
- if (rsize == 0)
- break;
- wsize = write(fdv, buf + bufoff, rpos - wpos);
- if (wsize < 0) {
- rc = -errno;
- fprintf(stderr, "write failed on volatile"
- " for %s (%s)\n", name, strerror(-rc));
- goto error;
+ if (migration_flags & MIGRATION_BLOCKS || !file_lease_supported) {
+ /* Blocking mode, forced if servers do not support file lease */
+ rc = migrate_block(fd, fdv, &st, buf_size, name);
+ } else {
+ rc = migrate_nonblock(fd, fdv, &st, buf_size, name);
+ if (rc == 0) {
+ have_lease_rdlck = false;
+ fdv = -1; /* The volatile file is closed as we put the
+ * lease in non-blocking mode. */
}
- wpos += wsize;
- bufoff += wsize;
- } while (1);
-
- /* flush data */
- fsync(fdv);
-
- if (migration_flags & MIGRATION_BLOCKS) {
- /* give back group lock */
- rc = llapi_group_unlock(fd, gid);
- if (rc < 0)
- fprintf(stderr, "cannot put group lock on %s (%s)\n",
- name, strerror(-rc));
- have_gl = 0;
}
- /* swap layouts
- * for a migration we need to:
- * - check data version on file did not change
- * - keep file mtime
- * - keep file atime
- */
- rc = llapi_fswap_layouts(fd, fdv, dv1, 0,
- SWAP_LAYOUTS_CHECK_DV1 |
- SWAP_LAYOUTS_KEEP_MTIME |
- SWAP_LAYOUTS_KEEP_ATIME);
- if (rc == -EAGAIN) {
- fprintf(stderr, "%s: dataversion changed during copy, "
- "migration aborted\n", name);
- goto error;
- }
- if (rc != 0)
- fprintf(stderr, "%s: swap layout to new file failed: %s\n",
- name, strerror(-rc));
-
error:
- /* give back group lock */
- if ((migration_flags & MIGRATION_BLOCKS) && have_gl) {
- int rc2;
+ if (have_lease_rdlck)
+ llapi_lease_put(fd);
- /* we keep the original error in rc */
- rc2 = llapi_group_unlock(fd, gid);
- if (rc2 < 0)
- fprintf(stderr, "cannot put group lock on %s (%s)\n",
- name, strerror(-rc2));
- }
+ if (fd >= 0)
+ close(fd);
+
+ if (fdv >= 0)
+ close(fdv);
- close(fdv);
- close(fd);
free:
if (lum)
free(lum);
- if (buf)
- free(buf);
+
return rc;
}
struct llapi_stripe_param *param;
char *fname;
int result;
+ int result2 = 0;
unsigned long long st_size;
int st_offset, st_count;
char *end;
case 'b':
if (!migrate_mode) {
fprintf(stderr, "--block is valid only for"
- " migrate mode");
+ " migrate mode\n");
return CMD_HELP;
}
migration_flags |= MIGRATION_BLOCKS;
memcpy(param->lsp_osts, osts, sizeof(*osts) * nr_osts);
}
- do {
- if (!migrate_mode) {
+ for (fname = argv[optind]; fname != NULL; fname = argv[++optind]) {
+ if (migrate_mode) {
+ result = lfs_migrate(fname, migration_flags, param);
+ } else {
result = llapi_file_open_param(fname,
O_CREAT | O_WRONLY,
0644, param);
close(result);
result = 0;
}
- } else {
- result = lfs_migrate(fname, migration_flags, param);
}
if (result) {
+ /* Save the first error encountered. */
+ if (result2 == 0)
+ result2 = result;
fprintf(stderr,
"error: %s: %s stripe file '%s' failed\n",
argv[0], migrate_mode ? "migrate" : "create",
fname);
- break;
+ continue;
}
- fname = argv[++optind];
- } while (fname != NULL);
+ }
free(param);
- return result;
+ return result2;
}
static int lfs_poollist(int argc, char **argv)
Parser_init("lfs > ", cmdlist);
+ progname = argv[0]; /* Used in error messages */
if (argc > 1) {
rc = Parser_execarg(argc - 1, argv + 1, cmdlist);
} else {
git://git.whamcloud.com / fs / lustre-release.git / blobdiff