#include <linux/lockdep.h>
#include <linux/module.h>
#include <linux/backing-dev.h>
+#include <linux/fs_parser.h>
#include "gfs2.h"
#include "incore.h"
}
/**
- * fill_super - Read in superblock
+ * gfs2_fill_super - Read in superblock
* @sb: The VFS superblock
- * @data: Mount options
+ * @args: Mount options
* @silent: Don't complain if it's not a GFS2 filesystem
*
- * Returns: errno
+ * Returns: -errno
*/
-
-static int fill_super(struct super_block *sb, struct gfs2_args *args, int silent)
+static int gfs2_fill_super(struct super_block *sb, struct fs_context *fc)
{
+ struct gfs2_args *args = fc->fs_private;
+ int silent = fc->sb_flags & SB_SILENT;
struct gfs2_sbd *sdp;
struct gfs2_holder mount_gh;
int error;
return error;
}
-static int set_gfs2_super(struct super_block *s, void *data)
+/**
+ * gfs2_get_tree - Get the GFS2 superblock and root directory
+ * @fc: The filesystem context
+ *
+ * Returns: 0 or -errno on error
+ */
+static int gfs2_get_tree(struct fs_context *fc)
{
- s->s_bdev = data;
- s->s_dev = s->s_bdev->bd_dev;
- s->s_bdi = bdi_get(s->s_bdev->bd_bdi);
+ struct gfs2_args *args = fc->fs_private;
+ struct gfs2_sbd *sdp;
+ int error;
+
+ error = get_tree_bdev(fc, gfs2_fill_super);
+ if (error)
+ return error;
+
+ sdp = fc->root->d_sb->s_fs_info;
+ dput(fc->root);
+ if (args->ar_meta)
+ fc->root = dget(sdp->sd_master_dir);
+ else
+ fc->root = dget(sdp->sd_root_dir);
return 0;
}
-static int test_gfs2_super(struct super_block *s, void *ptr)
+static void gfs2_fc_free(struct fs_context *fc)
{
- struct block_device *bdev = ptr;
- return (bdev == s->s_bdev);
+ struct gfs2_args *args = fc->fs_private;
+
+ kfree(args);
}
-/**
- * gfs2_mount - Get the GFS2 superblock
- * @fs_type: The GFS2 filesystem type
- * @flags: Mount flags
- * @dev_name: The name of the device
- * @data: The mount arguments
- *
- * Q. Why not use get_sb_bdev() ?
- * A. We need to select one of two root directories to mount, independent
- * of whether this is the initial, or subsequent, mount of this sb
- *
- * Returns: 0 or -ve on error
- */
+enum gfs2_param {
+ Opt_lockproto,
+ Opt_locktable,
+ Opt_hostdata,
+ Opt_spectator,
+ Opt_ignore_local_fs,
+ Opt_localflocks,
+ Opt_localcaching,
+ Opt_debug,
+ Opt_upgrade,
+ Opt_acl,
+ Opt_quota,
+ Opt_suiddir,
+ Opt_data,
+ Opt_meta,
+ Opt_discard,
+ Opt_commit,
+ Opt_errors,
+ Opt_statfs_quantum,
+ Opt_statfs_percent,
+ Opt_quota_quantum,
+ Opt_barrier,
+ Opt_rgrplvb,
+ Opt_loccookie,
+};
-static struct dentry *gfs2_mount(struct file_system_type *fs_type, int flags,
- const char *dev_name, void *data)
-{
- struct block_device *bdev;
- struct super_block *s;
- fmode_t mode = FMODE_READ | FMODE_EXCL;
- int error;
- struct gfs2_args args;
- struct gfs2_sbd *sdp;
+enum opt_quota {
+ Opt_quota_unset = 0,
+ Opt_quota_off,
+ Opt_quota_account,
+ Opt_quota_on,
+};
+
+static const unsigned int opt_quota_values[] = {
+ [Opt_quota_off] = GFS2_QUOTA_OFF,
+ [Opt_quota_account] = GFS2_QUOTA_ACCOUNT,
+ [Opt_quota_on] = GFS2_QUOTA_ON,
+};
- if (!(flags & SB_RDONLY))
- mode |= FMODE_WRITE;
+enum opt_data {
+ Opt_data_writeback = GFS2_DATA_WRITEBACK,
+ Opt_data_ordered = GFS2_DATA_ORDERED,
+};
- bdev = blkdev_get_by_path(dev_name, mode, fs_type);
- if (IS_ERR(bdev))
- return ERR_CAST(bdev);
+enum opt_errors {
+ Opt_errors_withdraw = GFS2_ERRORS_WITHDRAW,
+ Opt_errors_panic = GFS2_ERRORS_PANIC,
+};
- /*
- * once the super is inserted into the list by sget, s_umount
- * will protect the lockfs code from trying to start a snapshot
- * while we are mounting
- */
- mutex_lock(&bdev->bd_fsfreeze_mutex);
- if (bdev->bd_fsfreeze_count > 0) {
- mutex_unlock(&bdev->bd_fsfreeze_mutex);
- error = -EBUSY;
- goto error_bdev;
- }
- s = sget(fs_type, test_gfs2_super, set_gfs2_super, flags, bdev);
- mutex_unlock(&bdev->bd_fsfreeze_mutex);
- error = PTR_ERR(s);
- if (IS_ERR(s))
- goto error_bdev;
-
- if (s->s_root) {
- /*
- * s_umount nests inside bd_mutex during
- * __invalidate_device(). blkdev_put() acquires
- * bd_mutex and can't be called under s_umount. Drop
- * s_umount temporarily. This is safe as we're
- * holding an active reference.
- */
- up_write(&s->s_umount);
- blkdev_put(bdev, mode);
- down_write(&s->s_umount);
- } else {
- /* s_mode must be set before deactivate_locked_super calls */
- s->s_mode = mode;
- }
+static const struct fs_parameter_spec gfs2_param_specs[] = {
+ fsparam_string ("lockproto", Opt_lockproto),
+ fsparam_string ("locktable", Opt_locktable),
+ fsparam_string ("hostdata", Opt_hostdata),
+ fsparam_flag ("spectator", Opt_spectator),
+ fsparam_flag ("norecovery", Opt_spectator),
+ fsparam_flag ("ignore_local_fs", Opt_ignore_local_fs),
+ fsparam_flag ("localflocks", Opt_localflocks),
+ fsparam_flag ("localcaching", Opt_localcaching),
+ fsparam_flag_no("debug", Opt_debug),
+ fsparam_flag ("upgrade", Opt_upgrade),
+ fsparam_flag_no("acl", Opt_acl),
+ fsparam_flag_no("suiddir", Opt_suiddir),
+ fsparam_enum ("data", Opt_data),
+ fsparam_flag ("meta", Opt_meta),
+ fsparam_flag_no("discard", Opt_discard),
+ fsparam_s32 ("commit", Opt_commit),
+ fsparam_enum ("errors", Opt_errors),
+ fsparam_s32 ("statfs_quantum", Opt_statfs_quantum),
+ fsparam_s32 ("statfs_percent", Opt_statfs_percent),
+ fsparam_s32 ("quota_quantum", Opt_quota_quantum),
+ fsparam_flag_no("barrier", Opt_barrier),
+ fsparam_flag_no("rgrplvb", Opt_rgrplvb),
+ fsparam_flag_no("loccookie", Opt_loccookie),
+ /* quota can be a flag or an enum so it gets special treatment */
+ __fsparam(fs_param_is_enum, "quota", Opt_quota, fs_param_neg_with_no|fs_param_v_optional),
+ {}
+};
- memset(&args, 0, sizeof(args));
- args.ar_quota = GFS2_QUOTA_DEFAULT;
- args.ar_data = GFS2_DATA_DEFAULT;
- args.ar_commit = 30;
- args.ar_statfs_quantum = 30;
- args.ar_quota_quantum = 60;
- args.ar_errors = GFS2_ERRORS_DEFAULT;
+static const struct fs_parameter_enum gfs2_param_enums[] = {
+ { Opt_quota, "off", Opt_quota_off },
+ { Opt_quota, "account", Opt_quota_account },
+ { Opt_quota, "on", Opt_quota_on },
+ { Opt_data, "writeback", Opt_data_writeback },
+ { Opt_data, "ordered", Opt_data_ordered },
+ { Opt_errors, "withdraw", Opt_errors_withdraw },
+ { Opt_errors, "panic", Opt_errors_panic },
+ {}
+};
- error = gfs2_mount_args(&args, data);
- if (error) {
- pr_warn("can't parse mount arguments\n");
- goto error_super;
+const struct fs_parameter_description gfs2_fs_parameters = {
+ .name = "gfs2",
+ .specs = gfs2_param_specs,
+ .enums = gfs2_param_enums,
+};
+
+/* Parse a single mount parameter */
+static int gfs2_parse_param(struct fs_context *fc, struct fs_parameter *param)
+{
+ struct gfs2_args *args = fc->fs_private;
+ struct fs_parse_result result;
+ int o;
+
+ o = fs_parse(fc, &gfs2_fs_parameters, param, &result);
+ if (o < 0)
+ return o;
+
+ switch (o) {
+ case Opt_lockproto:
+ strlcpy(args->ar_lockproto, param->string, GFS2_LOCKNAME_LEN);
+ break;
+ case Opt_locktable:
+ strlcpy(args->ar_locktable, param->string, GFS2_LOCKNAME_LEN);
+ break;
+ case Opt_hostdata:
+ strlcpy(args->ar_hostdata, param->string, GFS2_LOCKNAME_LEN);
+ break;
+ case Opt_spectator:
+ args->ar_spectator = 1;
+ break;
+ case Opt_ignore_local_fs:
+ /* Retained for backwards compat only */
+ break;
+ case Opt_localflocks:
+ args->ar_localflocks = 1;
+ break;
+ case Opt_localcaching:
+ /* Retained for backwards compat only */
+ break;
+ case Opt_debug:
+ if (result.boolean && args->ar_errors == GFS2_ERRORS_PANIC)
+ return invalf(fc, "gfs2: -o debug and -o errors=panic are mutually exclusive");
+ args->ar_debug = result.boolean;
+ break;
+ case Opt_upgrade:
+ /* Retained for backwards compat only */
+ break;
+ case Opt_acl:
+ args->ar_posix_acl = result.boolean;
+ break;
+ case Opt_quota:
+ /* The quota option can be a flag or an enum. A non-zero int_32
+ result means that we have an enum index. Otherwise we have
+ to rely on the 'negated' flag to tell us whether 'quota' or
+ 'noquota' was specified. */
+ if (result.negated)
+ args->ar_quota = GFS2_QUOTA_OFF;
+ else if (result.int_32 > 0)
+ args->ar_quota = opt_quota_values[result.int_32];
+ else
+ args->ar_quota = GFS2_QUOTA_ON;
+ break;
+ case Opt_suiddir:
+ args->ar_suiddir = result.boolean;
+ break;
+ case Opt_data:
+ /* The uint_32 result maps directly to GFS2_DATA_* */
+ args->ar_data = result.uint_32;
+ break;
+ case Opt_meta:
+ args->ar_meta = 1;
+ break;
+ case Opt_discard:
+ args->ar_discard = result.boolean;
+ break;
+ case Opt_commit:
+ if (result.int_32 <= 0)
+ return invalf(fc, "gfs2: commit mount option requires a positive numeric argument");
+ args->ar_commit = result.int_32;
+ break;
+ case Opt_statfs_quantum:
+ if (result.int_32 < 0)
+ return invalf(fc, "gfs2: statfs_quantum mount option requires a non-negative numeric argument");
+ args->ar_statfs_quantum = result.int_32;
+ break;
+ case Opt_quota_quantum:
+ if (result.int_32 <= 0)
+ return invalf(fc, "gfs2: quota_quantum mount option requires a positive numeric argument");
+ args->ar_quota_quantum = result.int_32;
+ break;
+ case Opt_statfs_percent:
+ if (result.int_32 < 0 || result.int_32 > 100)
+ return invalf(fc, "gfs2: statfs_percent mount option requires a numeric argument between 0 and 100");
+ args->ar_statfs_percent = result.int_32;
+ break;
+ case Opt_errors:
+ if (args->ar_debug && result.uint_32 == GFS2_ERRORS_PANIC)
+ return invalf(fc, "gfs2: -o debug and -o errors=panic are mutually exclusive");
+ args->ar_errors = result.uint_32;
+ break;
+ case Opt_barrier:
+ args->ar_nobarrier = result.boolean;
+ break;
+ case Opt_rgrplvb:
+ args->ar_rgrplvb = result.boolean;
+ break;
+ case Opt_loccookie:
+ args->ar_loccookie = result.boolean;
+ break;
+ default:
+ return invalf(fc, "gfs2: invalid mount option: %s", param->key);
}
+ return 0;
+}
- if (s->s_root) {
- error = -EBUSY;
- if ((flags ^ s->s_flags) & SB_RDONLY)
- goto error_super;
- } else {
- snprintf(s->s_id, sizeof(s->s_id), "%pg", bdev);
- sb_set_blocksize(s, block_size(bdev));
- error = fill_super(s, &args, flags & SB_SILENT ? 1 : 0);
- if (error)
- goto error_super;
- s->s_flags |= SB_ACTIVE;
- bdev->bd_super = s;
+static int gfs2_reconfigure(struct fs_context *fc)
+{
+ struct super_block *sb = fc->root->d_sb;
+ struct gfs2_sbd *sdp = sb->s_fs_info;
+ struct gfs2_args *oldargs = &sdp->sd_args;
+ struct gfs2_args *newargs = fc->fs_private;
+ struct gfs2_tune *gt = &sdp->sd_tune;
+ int error = 0;
+
+ sync_filesystem(sb);
+
+ spin_lock(>->gt_spin);
+ oldargs->ar_commit = gt->gt_logd_secs;
+ oldargs->ar_quota_quantum = gt->gt_quota_quantum;
+ if (gt->gt_statfs_slow)
+ oldargs->ar_statfs_quantum = 0;
+ else
+ oldargs->ar_statfs_quantum = gt->gt_statfs_quantum;
+ spin_unlock(>->gt_spin);
+
+ if (strcmp(newargs->ar_lockproto, oldargs->ar_lockproto)) {
+ errorf(fc, "gfs2: reconfiguration of locking protocol not allowed");
+ return -EINVAL;
+ }
+ if (strcmp(newargs->ar_locktable, oldargs->ar_locktable)) {
+ errorf(fc, "gfs2: reconfiguration of lock table not allowed");
+ return -EINVAL;
+ }
+ if (strcmp(newargs->ar_hostdata, oldargs->ar_hostdata)) {
+ errorf(fc, "gfs2: reconfiguration of host data not allowed");
+ return -EINVAL;
+ }
+ if (newargs->ar_spectator != oldargs->ar_spectator) {
+ errorf(fc, "gfs2: reconfiguration of spectator mode not allowed");
+ return -EINVAL;
+ }
+ if (newargs->ar_localflocks != oldargs->ar_localflocks) {
+ errorf(fc, "gfs2: reconfiguration of localflocks not allowed");
+ return -EINVAL;
+ }
+ if (newargs->ar_meta != oldargs->ar_meta) {
+ errorf(fc, "gfs2: switching between gfs2 and gfs2meta not allowed");
+ return -EINVAL;
+ }
+ if (oldargs->ar_spectator)
+ fc->sb_flags |= SB_RDONLY;
+
+ if ((sb->s_flags ^ fc->sb_flags) & SB_RDONLY) {
+ if (fc->sb_flags & SB_RDONLY) {
+ error = gfs2_make_fs_ro(sdp);
+ if (error)
+ errorf(fc, "gfs2: unable to remount read-only");
+ } else {
+ error = gfs2_make_fs_rw(sdp);
+ if (error)
+ errorf(fc, "gfs2: unable to remount read-write");
+ }
}
+ sdp->sd_args = *newargs;
- sdp = s->s_fs_info;
- if (args.ar_meta)
- return dget(sdp->sd_master_dir);
+ if (sdp->sd_args.ar_posix_acl)
+ sb->s_flags |= SB_POSIXACL;
+ else
+ sb->s_flags &= ~SB_POSIXACL;
+ if (sdp->sd_args.ar_nobarrier)
+ set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
else
- return dget(sdp->sd_root_dir);
-
-error_super:
- deactivate_locked_super(s);
- return ERR_PTR(error);
-error_bdev:
- blkdev_put(bdev, mode);
- return ERR_PTR(error);
+ clear_bit(SDF_NOBARRIERS, &sdp->sd_flags);
+ spin_lock(>->gt_spin);
+ gt->gt_logd_secs = newargs->ar_commit;
+ gt->gt_quota_quantum = newargs->ar_quota_quantum;
+ if (newargs->ar_statfs_quantum) {
+ gt->gt_statfs_slow = 0;
+ gt->gt_statfs_quantum = newargs->ar_statfs_quantum;
+ }
+ else {
+ gt->gt_statfs_slow = 1;
+ gt->gt_statfs_quantum = 30;
+ }
+ spin_unlock(>->gt_spin);
+
+ gfs2_online_uevent(sdp);
+ return error;
+}
+
+static const struct fs_context_operations gfs2_context_ops = {
+ .free = gfs2_fc_free,
+ .parse_param = gfs2_parse_param,
+ .get_tree = gfs2_get_tree,
+ .reconfigure = gfs2_reconfigure,
+};
+
+/* Set up the filesystem mount context */
+static int gfs2_init_fs_context(struct fs_context *fc)
+{
+ struct gfs2_args *args;
+
+ args = kzalloc(sizeof(*args), GFP_KERNEL);
+ if (args == NULL)
+ return -ENOMEM;
+
+ args->ar_quota = GFS2_QUOTA_DEFAULT;
+ args->ar_data = GFS2_DATA_DEFAULT;
+ args->ar_commit = 30;
+ args->ar_statfs_quantum = 30;
+ args->ar_quota_quantum = 60;
+ args->ar_errors = GFS2_ERRORS_DEFAULT;
+
+ fc->fs_private = args;
+ fc->ops = &gfs2_context_ops;
+ return 0;
}
-static int set_meta_super(struct super_block *s, void *ptr)
+static int set_meta_super(struct super_block *s, struct fs_context *fc)
{
return -EINVAL;
}
-static struct dentry *gfs2_mount_meta(struct file_system_type *fs_type,
- int flags, const char *dev_name, void *data)
+static int test_meta_super(struct super_block *s, struct fs_context *fc)
+{
+ return (fc->sget_key == s->s_bdev);
+}
+
+static int gfs2_meta_get_tree(struct fs_context *fc)
{
struct super_block *s;
struct gfs2_sbd *sdp;
struct path path;
int error;
- if (!dev_name || !*dev_name)
- return ERR_PTR(-EINVAL);
+ if (!fc->source || !*fc->source)
+ return -EINVAL;
- error = kern_path(dev_name, LOOKUP_FOLLOW, &path);
+ error = kern_path(fc->source, LOOKUP_FOLLOW, &path);
if (error) {
pr_warn("path_lookup on %s returned error %d\n",
- dev_name, error);
- return ERR_PTR(error);
+ fc->source, error);
+ return error;
}
- s = sget(&gfs2_fs_type, test_gfs2_super, set_meta_super, flags,
- path.dentry->d_sb->s_bdev);
+ fc->fs_type = &gfs2_fs_type;
+ fc->sget_key = path.dentry->d_sb->s_bdev;
+ s = sget_fc(fc, test_meta_super, set_meta_super);
path_put(&path);
if (IS_ERR(s)) {
pr_warn("gfs2 mount does not exist\n");
- return ERR_CAST(s);
+ return PTR_ERR(s);
}
- if ((flags ^ s->s_flags) & SB_RDONLY) {
+ if ((fc->sb_flags ^ s->s_flags) & SB_RDONLY) {
deactivate_locked_super(s);
- return ERR_PTR(-EBUSY);
+ return -EBUSY;
}
sdp = s->s_fs_info;
- return dget(sdp->sd_master_dir);
+ fc->root = dget(sdp->sd_master_dir);
+ return 0;
+}
+
+static const struct fs_context_operations gfs2_meta_context_ops = {
+ .get_tree = gfs2_meta_get_tree,
+};
+
+static int gfs2_meta_init_fs_context(struct fs_context *fc)
+{
+ int ret = gfs2_init_fs_context(fc);
+
+ if (ret)
+ return ret;
+
+ fc->ops = &gfs2_meta_context_ops;
+ return 0;
}
static void gfs2_kill_sb(struct super_block *sb)
struct file_system_type gfs2_fs_type = {
.name = "gfs2",
.fs_flags = FS_REQUIRES_DEV,
- .mount = gfs2_mount,
+ .init_fs_context = gfs2_init_fs_context,
+ .parameters = &gfs2_fs_parameters,
.kill_sb = gfs2_kill_sb,
.owner = THIS_MODULE,
};
struct file_system_type gfs2meta_fs_type = {
.name = "gfs2meta",
.fs_flags = FS_REQUIRES_DEV,
- .mount = gfs2_mount_meta,
+ .init_fs_context = gfs2_meta_init_fs_context,
.owner = THIS_MODULE,
};
MODULE_ALIAS_FS("gfs2meta");
projects / linux-2.6-block.git / blobdiff