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hugetlbfs: Convert to fs_context
Convert the hugetlbfs to use the fs_context during mount. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
David Howells
Al Viro
parent
a187537473
commit
32021982a3
@ -27,7 +27,7 @@
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#include <linux/backing-dev.h>
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#include <linux/hugetlb.h>
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#include <linux/pagevec.h>
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#include <linux/parser.h>
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#include <linux/fs_parser.h>
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#include <linux/mman.h>
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#include <linux/slab.h>
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#include <linux/dnotify.h>
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@ -45,11 +45,17 @@ const struct file_operations hugetlbfs_file_operations;
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static const struct inode_operations hugetlbfs_dir_inode_operations;
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static const struct inode_operations hugetlbfs_inode_operations;
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struct hugetlbfs_config {
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enum hugetlbfs_size_type { NO_SIZE, SIZE_STD, SIZE_PERCENT };
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struct hugetlbfs_fs_context {
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struct hstate *hstate;
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unsigned long long max_size_opt;
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unsigned long long min_size_opt;
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long max_hpages;
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long nr_inodes;
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long min_hpages;
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enum hugetlbfs_size_type max_val_type;
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enum hugetlbfs_size_type min_val_type;
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kuid_t uid;
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kgid_t gid;
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umode_t mode;
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@ -57,22 +63,30 @@ struct hugetlbfs_config {
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int sysctl_hugetlb_shm_group;
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enum {
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Opt_size, Opt_nr_inodes,
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Opt_mode, Opt_uid, Opt_gid,
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Opt_pagesize, Opt_min_size,
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Opt_err,
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enum hugetlb_param {
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Opt_gid,
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Opt_min_size,
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Opt_mode,
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Opt_nr_inodes,
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Opt_pagesize,
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Opt_size,
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Opt_uid,
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};
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static const match_table_t tokens = {
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{Opt_size, "size=%s"},
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{Opt_nr_inodes, "nr_inodes=%s"},
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{Opt_mode, "mode=%o"},
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{Opt_uid, "uid=%u"},
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{Opt_gid, "gid=%u"},
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{Opt_pagesize, "pagesize=%s"},
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{Opt_min_size, "min_size=%s"},
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{Opt_err, NULL},
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static const struct fs_parameter_spec hugetlb_param_specs[] = {
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fsparam_u32 ("gid", Opt_gid),
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fsparam_string("min_size", Opt_min_size),
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fsparam_u32 ("mode", Opt_mode),
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fsparam_string("nr_inodes", Opt_nr_inodes),
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fsparam_string("pagesize", Opt_pagesize),
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fsparam_string("size", Opt_size),
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fsparam_u32 ("uid", Opt_uid),
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{}
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};
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static const struct fs_parameter_description hugetlb_fs_parameters = {
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.name = "hugetlbfs",
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.specs = hugetlb_param_specs,
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};
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#ifdef CONFIG_NUMA
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@ -708,16 +722,16 @@ static int hugetlbfs_setattr(struct dentry *dentry, struct iattr *attr)
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}
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static struct inode *hugetlbfs_get_root(struct super_block *sb,
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struct hugetlbfs_config *config)
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struct hugetlbfs_fs_context *ctx)
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{
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struct inode *inode;
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inode = new_inode(sb);
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if (inode) {
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inode->i_ino = get_next_ino();
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inode->i_mode = S_IFDIR | config->mode;
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inode->i_uid = config->uid;
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inode->i_gid = config->gid;
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inode->i_mode = S_IFDIR | ctx->mode;
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inode->i_uid = ctx->uid;
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inode->i_gid = ctx->gid;
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inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
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inode->i_op = &hugetlbfs_dir_inode_operations;
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inode->i_fop = &simple_dir_operations;
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@ -1081,8 +1095,6 @@ static const struct super_operations hugetlbfs_ops = {
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.show_options = hugetlbfs_show_options,
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};
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enum hugetlbfs_size_type { NO_SIZE, SIZE_STD, SIZE_PERCENT };
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/*
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* Convert size option passed from command line to number of huge pages
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* in the pool specified by hstate. Size option could be in bytes
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@ -1105,170 +1117,151 @@ hugetlbfs_size_to_hpages(struct hstate *h, unsigned long long size_opt,
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return size_opt;
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}
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static int
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hugetlbfs_parse_options(char *options, struct hugetlbfs_config *pconfig)
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/*
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* Parse one mount parameter.
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*/
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static int hugetlbfs_parse_param(struct fs_context *fc, struct fs_parameter *param)
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{
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char *p, *rest;
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substring_t args[MAX_OPT_ARGS];
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int option;
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unsigned long long max_size_opt = 0, min_size_opt = 0;
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enum hugetlbfs_size_type max_val_type = NO_SIZE, min_val_type = NO_SIZE;
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struct hugetlbfs_fs_context *ctx = fc->fs_private;
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struct fs_parse_result result;
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char *rest;
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unsigned long ps;
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int opt;
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if (!options)
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opt = fs_parse(fc, &hugetlb_fs_parameters, param, &result);
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if (opt < 0)
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return opt;
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switch (opt) {
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case Opt_uid:
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ctx->uid = make_kuid(current_user_ns(), result.uint_32);
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if (!uid_valid(ctx->uid))
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goto bad_val;
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return 0;
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while ((p = strsep(&options, ",")) != NULL) {
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int token;
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if (!*p)
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continue;
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case Opt_gid:
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ctx->gid = make_kgid(current_user_ns(), result.uint_32);
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if (!gid_valid(ctx->gid))
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goto bad_val;
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return 0;
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token = match_token(p, tokens, args);
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switch (token) {
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case Opt_uid:
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if (match_int(&args[0], &option))
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goto bad_val;
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pconfig->uid = make_kuid(current_user_ns(), option);
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if (!uid_valid(pconfig->uid))
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goto bad_val;
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break;
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case Opt_mode:
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ctx->mode = result.uint_32 & 01777U;
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return 0;
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case Opt_gid:
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if (match_int(&args[0], &option))
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goto bad_val;
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pconfig->gid = make_kgid(current_user_ns(), option);
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if (!gid_valid(pconfig->gid))
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goto bad_val;
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break;
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case Opt_size:
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/* memparse() will accept a K/M/G without a digit */
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if (!isdigit(param->string[0]))
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goto bad_val;
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ctx->max_size_opt = memparse(param->string, &rest);
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ctx->max_val_type = SIZE_STD;
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if (*rest == '%')
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ctx->max_val_type = SIZE_PERCENT;
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return 0;
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case Opt_mode:
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if (match_octal(&args[0], &option))
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goto bad_val;
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pconfig->mode = option & 01777U;
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break;
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case Opt_nr_inodes:
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/* memparse() will accept a K/M/G without a digit */
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if (!isdigit(param->string[0]))
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goto bad_val;
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ctx->nr_inodes = memparse(param->string, &rest);
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return 0;
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case Opt_size: {
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/* memparse() will accept a K/M/G without a digit */
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if (!isdigit(*args[0].from))
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goto bad_val;
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max_size_opt = memparse(args[0].from, &rest);
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max_val_type = SIZE_STD;
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if (*rest == '%')
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max_val_type = SIZE_PERCENT;
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break;
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}
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case Opt_nr_inodes:
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/* memparse() will accept a K/M/G without a digit */
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if (!isdigit(*args[0].from))
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goto bad_val;
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pconfig->nr_inodes = memparse(args[0].from, &rest);
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break;
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case Opt_pagesize: {
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unsigned long ps;
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ps = memparse(args[0].from, &rest);
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pconfig->hstate = size_to_hstate(ps);
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if (!pconfig->hstate) {
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pr_err("Unsupported page size %lu MB\n",
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ps >> 20);
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return -EINVAL;
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}
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break;
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}
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case Opt_min_size: {
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/* memparse() will accept a K/M/G without a digit */
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if (!isdigit(*args[0].from))
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goto bad_val;
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min_size_opt = memparse(args[0].from, &rest);
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min_val_type = SIZE_STD;
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if (*rest == '%')
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min_val_type = SIZE_PERCENT;
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break;
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}
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default:
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pr_err("Bad mount option: \"%s\"\n", p);
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case Opt_pagesize:
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ps = memparse(param->string, &rest);
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ctx->hstate = size_to_hstate(ps);
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if (!ctx->hstate) {
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pr_err("Unsupported page size %lu MB\n", ps >> 20);
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return -EINVAL;
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break;
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}
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return 0;
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case Opt_min_size:
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/* memparse() will accept a K/M/G without a digit */
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if (!isdigit(param->string[0]))
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goto bad_val;
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ctx->min_size_opt = memparse(param->string, &rest);
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ctx->min_val_type = SIZE_STD;
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if (*rest == '%')
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ctx->min_val_type = SIZE_PERCENT;
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return 0;
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default:
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return -EINVAL;
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}
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bad_val:
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return invalf(fc, "hugetlbfs: Bad value '%s' for mount option '%s'\n",
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param->string, param->key);
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}
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/*
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* Validate the parsed options.
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*/
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static int hugetlbfs_validate(struct fs_context *fc)
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{
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struct hugetlbfs_fs_context *ctx = fc->fs_private;
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/*
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* Use huge page pool size (in hstate) to convert the size
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* options to number of huge pages. If NO_SIZE, -1 is returned.
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*/
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pconfig->max_hpages = hugetlbfs_size_to_hpages(pconfig->hstate,
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max_size_opt, max_val_type);
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pconfig->min_hpages = hugetlbfs_size_to_hpages(pconfig->hstate,
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min_size_opt, min_val_type);
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ctx->max_hpages = hugetlbfs_size_to_hpages(ctx->hstate,
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ctx->max_size_opt,
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ctx->max_val_type);
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ctx->min_hpages = hugetlbfs_size_to_hpages(ctx->hstate,
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ctx->min_size_opt,
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ctx->min_val_type);
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/*
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* If max_size was specified, then min_size must be smaller
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*/
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if (max_val_type > NO_SIZE &&
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pconfig->min_hpages > pconfig->max_hpages) {
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pr_err("minimum size can not be greater than maximum size\n");
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if (ctx->max_val_type > NO_SIZE &&
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ctx->min_hpages > ctx->max_hpages) {
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pr_err("Minimum size can not be greater than maximum size\n");
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return -EINVAL;
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}
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return 0;
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bad_val:
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pr_err("Bad value '%s' for mount option '%s'\n", args[0].from, p);
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return -EINVAL;
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}
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static int
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hugetlbfs_fill_super(struct super_block *sb, void *data, int silent)
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hugetlbfs_fill_super(struct super_block *sb, struct fs_context *fc)
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{
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int ret;
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struct hugetlbfs_config config;
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struct hugetlbfs_fs_context *ctx = fc->fs_private;
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struct hugetlbfs_sb_info *sbinfo;
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config.max_hpages = -1; /* No limit on size by default */
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config.nr_inodes = -1; /* No limit on number of inodes by default */
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config.uid = current_fsuid();
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config.gid = current_fsgid();
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config.mode = 0755;
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config.hstate = &default_hstate;
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config.min_hpages = -1; /* No default minimum size */
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ret = hugetlbfs_parse_options(data, &config);
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if (ret)
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return ret;
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sbinfo = kmalloc(sizeof(struct hugetlbfs_sb_info), GFP_KERNEL);
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if (!sbinfo)
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return -ENOMEM;
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sb->s_fs_info = sbinfo;
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sbinfo->hstate = config.hstate;
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spin_lock_init(&sbinfo->stat_lock);
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sbinfo->max_inodes = config.nr_inodes;
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sbinfo->free_inodes = config.nr_inodes;
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sbinfo->spool = NULL;
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sbinfo->uid = config.uid;
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sbinfo->gid = config.gid;
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sbinfo->mode = config.mode;
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sbinfo->hstate = ctx->hstate;
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sbinfo->max_inodes = ctx->nr_inodes;
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sbinfo->free_inodes = ctx->nr_inodes;
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sbinfo->spool = NULL;
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sbinfo->uid = ctx->uid;
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sbinfo->gid = ctx->gid;
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sbinfo->mode = ctx->mode;
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/*
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* Allocate and initialize subpool if maximum or minimum size is
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* specified. Any needed reservations (for minimim size) are taken
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* taken when the subpool is created.
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*/
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if (config.max_hpages != -1 || config.min_hpages != -1) {
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sbinfo->spool = hugepage_new_subpool(config.hstate,
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config.max_hpages,
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config.min_hpages);
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if (ctx->max_hpages != -1 || ctx->min_hpages != -1) {
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sbinfo->spool = hugepage_new_subpool(ctx->hstate,
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ctx->max_hpages,
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ctx->min_hpages);
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if (!sbinfo->spool)
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goto out_free;
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}
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sb->s_maxbytes = MAX_LFS_FILESIZE;
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sb->s_blocksize = huge_page_size(config.hstate);
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sb->s_blocksize_bits = huge_page_shift(config.hstate);
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sb->s_blocksize = huge_page_size(ctx->hstate);
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sb->s_blocksize_bits = huge_page_shift(ctx->hstate);
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sb->s_magic = HUGETLBFS_MAGIC;
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sb->s_op = &hugetlbfs_ops;
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sb->s_time_gran = 1;
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sb->s_root = d_make_root(hugetlbfs_get_root(sb, &config));
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sb->s_root = d_make_root(hugetlbfs_get_root(sb, ctx));
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if (!sb->s_root)
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goto out_free;
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return 0;
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@ -1278,16 +1271,52 @@ out_free:
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return -ENOMEM;
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}
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static struct dentry *hugetlbfs_mount(struct file_system_type *fs_type,
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int flags, const char *dev_name, void *data)
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static int hugetlbfs_get_tree(struct fs_context *fc)
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{
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return mount_nodev(fs_type, flags, data, hugetlbfs_fill_super);
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int err = hugetlbfs_validate(fc);
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if (err)
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return err;
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return vfs_get_super(fc, vfs_get_independent_super, hugetlbfs_fill_super);
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}
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static void hugetlbfs_fs_context_free(struct fs_context *fc)
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{
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kfree(fc->fs_private);
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}
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static const struct fs_context_operations hugetlbfs_fs_context_ops = {
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.free = hugetlbfs_fs_context_free,
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.parse_param = hugetlbfs_parse_param,
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.get_tree = hugetlbfs_get_tree,
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};
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static int hugetlbfs_init_fs_context(struct fs_context *fc)
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{
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struct hugetlbfs_fs_context *ctx;
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ctx = kzalloc(sizeof(struct hugetlbfs_fs_context), GFP_KERNEL);
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if (!ctx)
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return -ENOMEM;
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ctx->max_hpages = -1; /* No limit on size by default */
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ctx->nr_inodes = -1; /* No limit on number of inodes by default */
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ctx->uid = current_fsuid();
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ctx->gid = current_fsgid();
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ctx->mode = 0755;
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ctx->hstate = &default_hstate;
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ctx->min_hpages = -1; /* No default minimum size */
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ctx->max_val_type = NO_SIZE;
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ctx->min_val_type = NO_SIZE;
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fc->fs_private = ctx;
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fc->ops = &hugetlbfs_fs_context_ops;
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return 0;
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}
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static struct file_system_type hugetlbfs_fs_type = {
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.name = "hugetlbfs",
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.mount = hugetlbfs_mount,
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.kill_sb = kill_litter_super,
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.name = "hugetlbfs",
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.init_fs_context = hugetlbfs_init_fs_context,
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.parameters = &hugetlb_fs_parameters,
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.kill_sb = kill_litter_super,
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};
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static struct vfsmount *hugetlbfs_vfsmount[HUGE_MAX_HSTATE];
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@ -1372,8 +1401,29 @@ out:
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return file;
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}
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static struct vfsmount *__init mount_one_hugetlbfs(struct hstate *h)
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{
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struct fs_context *fc;
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struct vfsmount *mnt;
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fc = fs_context_for_mount(&hugetlbfs_fs_type, SB_KERNMOUNT);
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if (IS_ERR(fc)) {
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mnt = ERR_CAST(fc);
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||||
} else {
|
||||
struct hugetlbfs_fs_context *ctx = fc->fs_private;
|
||||
ctx->hstate = h;
|
||||
mnt = fc_mount(fc);
|
||||
put_fs_context(fc);
|
||||
}
|
||||
if (IS_ERR(mnt))
|
||||
pr_err("Cannot mount internal hugetlbfs for page size %uK",
|
||||
1U << (h->order + PAGE_SHIFT - 10));
|
||||
return mnt;
|
||||
}
|
||||
|
||||
static int __init init_hugetlbfs_fs(void)
|
||||
{
|
||||
struct vfsmount *mnt;
|
||||
struct hstate *h;
|
||||
int error;
|
||||
int i;
|
||||
@ -1396,24 +1446,16 @@ static int __init init_hugetlbfs_fs(void)
|
||||
|
||||
i = 0;
|
||||
for_each_hstate(h) {
|
||||
char buf[50];
|
||||
unsigned ps_kb = 1U << (h->order + PAGE_SHIFT - 10);
|
||||
|
||||
snprintf(buf, sizeof(buf), "pagesize=%uK", ps_kb);
|
||||
hugetlbfs_vfsmount[i] = kern_mount_data(&hugetlbfs_fs_type,
|
||||
buf);
|
||||
|
||||
if (IS_ERR(hugetlbfs_vfsmount[i])) {
|
||||
pr_err("Cannot mount internal hugetlbfs for "
|
||||
"page size %uK", ps_kb);
|
||||
error = PTR_ERR(hugetlbfs_vfsmount[i]);
|
||||
hugetlbfs_vfsmount[i] = NULL;
|
||||
mnt = mount_one_hugetlbfs(h);
|
||||
if (IS_ERR(mnt) && i == 0) {
|
||||
error = PTR_ERR(mnt);
|
||||
goto out;
|
||||
}
|
||||
hugetlbfs_vfsmount[i] = mnt;
|
||||
i++;
|
||||
}
|
||||
/* Non default hstates are optional */
|
||||
if (!IS_ERR_OR_NULL(hugetlbfs_vfsmount[default_hstate_idx]))
|
||||
return 0;
|
||||
|
||||
return 0;
|
||||
|
||||
out:
|
||||
kmem_cache_destroy(hugetlbfs_inode_cachep);
|
||||
|
||||
Loading…
Reference in New Issue
Block a user