Convert the zonefs filesystem to use the new mount API. Tested using the zonefs test suite from: https://github.com/damien-lemoal/zonefs-tools Signed-off-by: Bill O'Donnell <bodonnel@xxxxxxxxxx> --- Changelog: v2: Fix whitespace issues. Reorder functions to eliminate forward declaration. Remove superfluous variable ctx in zonefs_kill_super(). --- fs/zonefs/super.c | 165 ++++++++++++++++++++++++++-------------------- 1 file changed, 93 insertions(+), 72 deletions(-) diff --git a/fs/zonefs/super.c b/fs/zonefs/super.c index e6a75401677d..285e711fca9e 100644 --- a/fs/zonefs/super.c +++ b/fs/zonefs/super.c @@ -15,13 +15,14 @@ #include <linux/writeback.h> #include <linux/quotaops.h> #include <linux/seq_file.h> -#include <linux/parser.h> #include <linux/uio.h> #include <linux/mman.h> #include <linux/sched/mm.h> #include <linux/crc32.h> #include <linux/task_io_accounting_ops.h> +#include <linux/fs_parser.h> +#include <linux/fs_context.h> #include "zonefs.h" #define CREATE_TRACE_POINTS @@ -460,58 +461,47 @@ static int zonefs_statfs(struct dentry *dentry, struct kstatfs *buf) } enum { - Opt_errors_ro, Opt_errors_zro, Opt_errors_zol, Opt_errors_repair, - Opt_explicit_open, Opt_err, + Opt_errors, Opt_explicit_open, }; -static const match_table_t tokens = { - { Opt_errors_ro, "errors=remount-ro"}, - { Opt_errors_zro, "errors=zone-ro"}, - { Opt_errors_zol, "errors=zone-offline"}, - { Opt_errors_repair, "errors=repair"}, - { Opt_explicit_open, "explicit-open" }, - { Opt_err, NULL} +struct zonefs_context { + unsigned long s_mount_opts; }; -static int zonefs_parse_options(struct super_block *sb, char *options) -{ - struct zonefs_sb_info *sbi = ZONEFS_SB(sb); - substring_t args[MAX_OPT_ARGS]; - char *p; - - if (!options) - return 0; - - while ((p = strsep(&options, ",")) != NULL) { - int token; +static const struct constant_table zonefs_param_errors[] = { + {"remount-ro", ZONEFS_MNTOPT_ERRORS_RO}, + {"zone-ro", ZONEFS_MNTOPT_ERRORS_ZRO}, + {"zone-offline", ZONEFS_MNTOPT_ERRORS_ZOL}, + {"repair", ZONEFS_MNTOPT_ERRORS_REPAIR}, + {} +}; - if (!*p) - continue; +static const struct fs_parameter_spec zonefs_param_spec[] = { + fsparam_enum ("errors", Opt_errors, zonefs_param_errors), + fsparam_flag ("explicit-open", Opt_explicit_open), + {} +}; - token = match_token(p, tokens, args); - switch (token) { - case Opt_errors_ro: - sbi->s_mount_opts &= ~ZONEFS_MNTOPT_ERRORS_MASK; - sbi->s_mount_opts |= ZONEFS_MNTOPT_ERRORS_RO; - break; - case Opt_errors_zro: - sbi->s_mount_opts &= ~ZONEFS_MNTOPT_ERRORS_MASK; - sbi->s_mount_opts |= ZONEFS_MNTOPT_ERRORS_ZRO; - break; - case Opt_errors_zol: - sbi->s_mount_opts &= ~ZONEFS_MNTOPT_ERRORS_MASK; - sbi->s_mount_opts |= ZONEFS_MNTOPT_ERRORS_ZOL; - break; - case Opt_errors_repair: - sbi->s_mount_opts &= ~ZONEFS_MNTOPT_ERRORS_MASK; - sbi->s_mount_opts |= ZONEFS_MNTOPT_ERRORS_REPAIR; - break; - case Opt_explicit_open: - sbi->s_mount_opts |= ZONEFS_MNTOPT_EXPLICIT_OPEN; - break; - default: - return -EINVAL; - } +static int zonefs_parse_param(struct fs_context *fc, struct fs_parameter *param) +{ + struct zonefs_context *ctx = fc->fs_private; + struct fs_parse_result result; + int opt; + + opt = fs_parse(fc, zonefs_param_spec, param, &result); + if (opt < 0) + return opt; + + switch (opt) { + case Opt_errors: + ctx->s_mount_opts &= ~ZONEFS_MNTOPT_ERRORS_MASK; + ctx->s_mount_opts |= result.uint_32; + break; + case Opt_explicit_open: + ctx->s_mount_opts |= ZONEFS_MNTOPT_EXPLICIT_OPEN; + break; + default: + return -EINVAL; } return 0; @@ -533,13 +523,6 @@ static int zonefs_show_options(struct seq_file *seq, struct dentry *root) return 0; } -static int zonefs_remount(struct super_block *sb, int *flags, char *data) -{ - sync_filesystem(sb); - - return zonefs_parse_options(sb, data); -} - static int zonefs_inode_setattr(struct mnt_idmap *idmap, struct dentry *dentry, struct iattr *iattr) { @@ -1197,7 +1180,6 @@ static const struct super_operations zonefs_sops = { .alloc_inode = zonefs_alloc_inode, .free_inode = zonefs_free_inode, .statfs = zonefs_statfs, - .remount_fs = zonefs_remount, .show_options = zonefs_show_options, }; @@ -1242,9 +1224,10 @@ static void zonefs_release_zgroup_inodes(struct super_block *sb) * sub-directories and files according to the device zone configuration and * format options. */ -static int zonefs_fill_super(struct super_block *sb, void *data, int silent) +static int zonefs_fill_super(struct super_block *sb, struct fs_context *fc) { struct zonefs_sb_info *sbi; + struct zonefs_context *ctx = fc->fs_private; struct inode *inode; enum zonefs_ztype ztype; int ret; @@ -1281,7 +1264,7 @@ static int zonefs_fill_super(struct super_block *sb, void *data, int silent) sbi->s_uid = GLOBAL_ROOT_UID; sbi->s_gid = GLOBAL_ROOT_GID; sbi->s_perm = 0640; - sbi->s_mount_opts = ZONEFS_MNTOPT_ERRORS_RO; + sbi->s_mount_opts = ctx->s_mount_opts; atomic_set(&sbi->s_wro_seq_files, 0); sbi->s_max_wro_seq_files = bdev_max_open_zones(sb->s_bdev); @@ -1292,10 +1275,6 @@ static int zonefs_fill_super(struct super_block *sb, void *data, int silent) if (ret) return ret; - ret = zonefs_parse_options(sb, data); - if (ret) - return ret; - zonefs_info(sb, "Mounting %u zones", bdev_nr_zones(sb->s_bdev)); if (!sbi->s_max_wro_seq_files && @@ -1356,12 +1335,6 @@ static int zonefs_fill_super(struct super_block *sb, void *data, int silent) return ret; } -static struct dentry *zonefs_mount(struct file_system_type *fs_type, - int flags, const char *dev_name, void *data) -{ - return mount_bdev(fs_type, flags, dev_name, data, zonefs_fill_super); -} - static void zonefs_kill_super(struct super_block *sb) { struct zonefs_sb_info *sbi = ZONEFS_SB(sb); @@ -1376,15 +1349,63 @@ static void zonefs_kill_super(struct super_block *sb) kfree(sbi); } +static void zonefs_free_fc(struct fs_context *fc) +{ + kfree(fc->fs_private); +} + +static int zonefs_get_tree(struct fs_context *fc) +{ + return get_tree_bdev(fc, zonefs_fill_super); +} + +static int zonefs_reconfigure(struct fs_context *fc) +{ + struct zonefs_context *ctx = fc->fs_private; + struct super_block *sb = fc->root->d_sb; + struct zonefs_sb_info *sbi = sb->s_fs_info; + + sync_filesystem(fc->root->d_sb); + /* Copy new options from ctx into sbi. */ + sbi->s_mount_opts = ctx->s_mount_opts; + + return 0; +} + +static const struct fs_context_operations zonefs_context_ops = { + .parse_param = zonefs_parse_param, + .get_tree = zonefs_get_tree, + .reconfigure = zonefs_reconfigure, + .free = zonefs_free_fc, +}; + +/* + * Set up the filesystem mount context. + */ +static int zonefs_init_fs_context(struct fs_context *fc) +{ + struct zonefs_context *ctx; + + ctx = kzalloc(sizeof(struct zonefs_context), GFP_KERNEL); + if (!ctx) + return -ENOMEM; + ctx->s_mount_opts = ZONEFS_MNTOPT_ERRORS_RO; + fc->ops = &zonefs_context_ops; + fc->fs_private = ctx; + + return 0; +} + /* * File system definition and registration. */ static struct file_system_type zonefs_type = { - .owner = THIS_MODULE, - .name = "zonefs", - .mount = zonefs_mount, - .kill_sb = zonefs_kill_super, - .fs_flags = FS_REQUIRES_DEV, + .owner = THIS_MODULE, + .name = "zonefs", + .kill_sb = zonefs_kill_super, + .fs_flags = FS_REQUIRES_DEV, + .init_fs_context = zonefs_init_fs_context, + .parameters = zonefs_param_spec, }; static int __init zonefs_init_inodecache(void) -- 2.43.0
