diff options
| -rw-r--r-- | drivers/base/devtmpfs.c | 16 | ||||
| -rw-r--r-- | fs/ramfs/inode.c | 99 | ||||
| -rw-r--r-- | include/linux/ramfs.h | 4 | ||||
| -rw-r--r-- | include/linux/shmem_fs.h | 4 | ||||
| -rw-r--r-- | init/do_mounts.c | 9 | ||||
| -rw-r--r-- | mm/shmem.c | 187 |
6 files changed, 180 insertions, 139 deletions
diff --git a/drivers/base/devtmpfs.c b/drivers/base/devtmpfs.c index dabf5006a254..30d0523014e0 100644 --- a/drivers/base/devtmpfs.c +++ b/drivers/base/devtmpfs.c @@ -67,19 +67,15 @@ static struct dentry *public_dev_mount(struct file_system_type *fs_type, int fla return dget(s->s_root); } -static struct dentry *dev_mount(struct file_system_type *fs_type, int flags, - const char *dev_name, void *data) -{ +static struct file_system_type internal_fs_type = { + .name = "devtmpfs", #ifdef CONFIG_TMPFS - return shmem_mount(fs_type, flags, dev_name, data); + .init_fs_context = shmem_init_fs_context, + .parameters = &shmem_fs_parameters, #else - return ramfs_mount(fs_type, flags, dev_name, data); + .init_fs_context = ramfs_init_fs_context, + .parameters = &ramfs_fs_parameters, #endif -} - -static struct file_system_type internal_fs_type = { - .name = "devtmpfs", - .mount = dev_mount, .kill_sb = kill_litter_super, }; diff --git a/fs/ramfs/inode.c b/fs/ramfs/inode.c index b85d1e77e934..d82636e8eb65 100644 --- a/fs/ramfs/inode.c +++ b/fs/ramfs/inode.c @@ -36,6 +36,8 @@ #include <linux/magic.h> #include <linux/slab.h> #include <linux/uaccess.h> +#include <linux/fs_context.h> +#include <linux/fs_parser.h> #include "internal.h" struct ramfs_mount_opts { @@ -175,62 +177,52 @@ static const struct super_operations ramfs_ops = { .show_options = ramfs_show_options, }; -enum { +enum ramfs_param { Opt_mode, - Opt_err }; -static const match_table_t tokens = { - {Opt_mode, "mode=%o"}, - {Opt_err, NULL} +static const struct fs_parameter_spec ramfs_param_specs[] = { + fsparam_u32oct("mode", Opt_mode), + {} }; -static int ramfs_parse_options(char *data, struct ramfs_mount_opts *opts) +const struct fs_parameter_description ramfs_fs_parameters = { + .name = "ramfs", + .specs = ramfs_param_specs, +}; + +static int ramfs_parse_param(struct fs_context *fc, struct fs_parameter *param) { - substring_t args[MAX_OPT_ARGS]; - int option; - int token; - char *p; - - opts->mode = RAMFS_DEFAULT_MODE; - - while ((p = strsep(&data, ",")) != NULL) { - if (!*p) - continue; - - token = match_token(p, tokens, args); - switch (token) { - case Opt_mode: - if (match_octal(&args[0], &option)) - return -EINVAL; - opts->mode = option & S_IALLUGO; - break; + struct fs_parse_result result; + struct ramfs_fs_info *fsi = fc->s_fs_info; + int opt; + + opt = fs_parse(fc, &ramfs_fs_parameters, param, &result); + if (opt < 0) { /* * We might like to report bad mount options here; * but traditionally ramfs has ignored all mount options, * and as it is used as a !CONFIG_SHMEM simple substitute * for tmpfs, better continue to ignore other mount options. */ - } + if (opt == -ENOPARAM) + opt = 0; + return opt; + } + + switch (opt) { + case Opt_mode: + fsi->mount_opts.mode = result.uint_32 & S_IALLUGO; + break; } return 0; } -static int ramfs_fill_super(struct super_block *sb, void *data, int silent) +static int ramfs_fill_super(struct super_block *sb, struct fs_context *fc) { - struct ramfs_fs_info *fsi; + struct ramfs_fs_info *fsi = sb->s_fs_info; struct inode *inode; - int err; - - fsi = kzalloc(sizeof(struct ramfs_fs_info), GFP_KERNEL); - sb->s_fs_info = fsi; - if (!fsi) - return -ENOMEM; - - err = ramfs_parse_options(data, &fsi->mount_opts); - if (err) - return err; sb->s_maxbytes = MAX_LFS_FILESIZE; sb->s_blocksize = PAGE_SIZE; @@ -247,10 +239,34 @@ static int ramfs_fill_super(struct super_block *sb, void *data, int silent) return 0; } -struct dentry *ramfs_mount(struct file_system_type *fs_type, - int flags, const char *dev_name, void *data) +static int ramfs_get_tree(struct fs_context *fc) { - return mount_nodev(fs_type, flags, data, ramfs_fill_super); + return get_tree_nodev(fc, ramfs_fill_super); +} + +static void ramfs_free_fc(struct fs_context *fc) +{ + kfree(fc->s_fs_info); +} + +static const struct fs_context_operations ramfs_context_ops = { + .free = ramfs_free_fc, + .parse_param = ramfs_parse_param, + .get_tree = ramfs_get_tree, +}; + +int ramfs_init_fs_context(struct fs_context *fc) +{ + struct ramfs_fs_info *fsi; + + fsi = kzalloc(sizeof(*fsi), GFP_KERNEL); + if (!fsi) + return -ENOMEM; + + fsi->mount_opts.mode = RAMFS_DEFAULT_MODE; + fc->s_fs_info = fsi; + fc->ops = &ramfs_context_ops; + return 0; } static void ramfs_kill_sb(struct super_block *sb) @@ -261,7 +277,8 @@ static void ramfs_kill_sb(struct super_block *sb) static struct file_system_type ramfs_fs_type = { .name = "ramfs", - .mount = ramfs_mount, + .init_fs_context = ramfs_init_fs_context, + .parameters = &ramfs_fs_parameters, .kill_sb = ramfs_kill_sb, .fs_flags = FS_USERNS_MOUNT, }; diff --git a/include/linux/ramfs.h b/include/linux/ramfs.h index e4d7d141545e..b806a0ff6554 100644 --- a/include/linux/ramfs.h +++ b/include/linux/ramfs.h @@ -4,8 +4,7 @@ struct inode *ramfs_get_inode(struct super_block *sb, const struct inode *dir, umode_t mode, dev_t dev); -extern struct dentry *ramfs_mount(struct file_system_type *fs_type, - int flags, const char *dev_name, void *data); +extern int ramfs_init_fs_context(struct fs_context *fc); #ifdef CONFIG_MMU static inline int @@ -17,6 +16,7 @@ ramfs_nommu_expand_for_mapping(struct inode *inode, size_t newsize) extern int ramfs_nommu_expand_for_mapping(struct inode *inode, size_t newsize); #endif +extern const struct fs_parameter_description ramfs_fs_parameters; extern const struct file_operations ramfs_file_operations; extern const struct vm_operations_struct generic_file_vm_ops; diff --git a/include/linux/shmem_fs.h b/include/linux/shmem_fs.h index 88cb98b0e49b..de8e4b71e3ba 100644 --- a/include/linux/shmem_fs.h +++ b/include/linux/shmem_fs.h @@ -49,9 +49,9 @@ static inline struct shmem_inode_info *SHMEM_I(struct inode *inode) /* * Functions in mm/shmem.c called directly from elsewhere: */ +extern const struct fs_parameter_description shmem_fs_parameters; extern int shmem_init(void); -extern struct dentry *shmem_mount(struct file_system_type *fs_type, - int flags, const char *dev_name, void *data); +extern int shmem_init_fs_context(struct fs_context *fc); extern struct file *shmem_file_setup(const char *name, loff_t size, unsigned long flags); extern struct file *shmem_kernel_file_setup(const char *name, loff_t size, diff --git a/init/do_mounts.c b/init/do_mounts.c index 16c29e57f224..9634ecf3743d 100644 --- a/init/do_mounts.c +++ b/init/do_mounts.c @@ -627,18 +627,17 @@ out: } static bool is_tmpfs; -static struct dentry *rootfs_mount(struct file_system_type *fs_type, - int flags, const char *dev_name, void *data) +static int rootfs_init_fs_context(struct fs_context *fc) { if (IS_ENABLED(CONFIG_TMPFS) && is_tmpfs) - return shmem_mount(fs_type, flags, dev_name, data); + return shmem_init_fs_context(fc); - return ramfs_mount(fs_type, flags, dev_name, data); + return ramfs_init_fs_context(fc); } struct file_system_type rootfs_fs_type = { .name = "rootfs", - .mount = rootfs_mount, + .init_fs_context = rootfs_init_fs_context, .kill_sb = kill_litter_super, }; diff --git a/mm/shmem.c b/mm/shmem.c index 6a41595dd1b3..0f7fd4a85db6 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -3401,22 +3401,17 @@ const struct fs_parameter_description shmem_fs_parameters = { .enums = shmem_param_enums, }; -static int shmem_parse_one(struct shmem_options *ctx, - struct fs_parameter *param) +static int shmem_parse_one(struct fs_context *fc, struct fs_parameter *param) { - struct fs_context *fc = NULL; + struct shmem_options *ctx = fc->fs_private; struct fs_parse_result result; unsigned long long size; char *rest; int opt; opt = fs_parse(fc, &shmem_fs_parameters, param, &result); - if (opt < 0) { - if (opt == -ENOPARAM) - return invalf(fc, "tmpfs: Unknown parameter '%s'", - param->key); + if (opt < 0) return opt; - } switch (opt) { case Opt_size: @@ -3483,8 +3478,10 @@ bad_value: return invalf(fc, "tmpfs: Bad value for '%s'", param->key); } -static int shmem_parse_options(char *options, struct shmem_options *ctx) +static int shmem_parse_options(struct fs_context *fc, void *data) { + char *options = data; + while (options != NULL) { char *this_char = options; for (;;) { @@ -3504,85 +3501,81 @@ static int shmem_parse_options(char *options, struct shmem_options *ctx) } if (*this_char) { char *value = strchr(this_char,'='); - struct fs_parameter param = { - .key = this_char, - .type = fs_value_is_string, - }; + size_t len = 0; int err; if (value) { *value++ = '\0'; - param.size = strlen(value); - param.string = kstrdup(value, GFP_KERNEL); - if (!param.string) - goto error; + len = strlen(value); } - err = shmem_parse_one(ctx, ¶m); - kfree(param.string); - if (err) - goto error; + err = vfs_parse_fs_string(fc, this_char, value, len); + if (err < 0) + return err; } } return 0; - -error: - mpol_put(ctx->mpol); - ctx->mpol = NULL; - return 1; - } -static int shmem_remount_fs(struct super_block *sb, int *flags, char *data) +/* + * Reconfigure a shmem filesystem. + * + * Note that we disallow change from limited->unlimited blocks/inodes while any + * are in use; but we must separately disallow unlimited->limited, because in + * that case we have no record of how much is already in use. + */ +static int shmem_reconfigure(struct fs_context *fc) { - struct shmem_sb_info *sbinfo = SHMEM_SB(sb); - struct shmem_options ctx = {.seen = 0}; + struct shmem_options *ctx = fc->fs_private; + struct shmem_sb_info *sbinfo = SHMEM_SB(fc->root->d_sb); unsigned long inodes; - int error = -EINVAL; - - if (shmem_parse_options(data, &ctx)) - return error; + const char *err; spin_lock(&sbinfo->stat_lock); inodes = sbinfo->max_inodes - sbinfo->free_inodes; - /* - * Those tests disallow limited->unlimited while any are in use; - * but we must separately disallow unlimited->limited, because - * in that case we have no record of how much is already in use. - */ - if ((ctx.seen & SHMEM_SEEN_BLOCKS) && ctx.blocks) { - if (!sbinfo->max_blocks) + if ((ctx->seen & SHMEM_SEEN_BLOCKS) && ctx->blocks) { + if (!sbinfo->max_blocks) { + err = "Cannot retroactively limit size"; goto out; + } if (percpu_counter_compare(&sbinfo->used_blocks, - ctx.blocks) > 0) + ctx->blocks) > 0) { + err = "Too small a size for current use"; goto out; + } } - if ((ctx.seen & SHMEM_SEEN_INODES) && ctx.inodes) { - if (!sbinfo->max_inodes) + if ((ctx->seen & SHMEM_SEEN_INODES) && ctx->inodes) { + if (!sbinfo->max_inodes) { + err = "Cannot retroactively limit inodes"; goto out; - if (ctx.inodes < inodes) + } + if (ctx->inodes < inodes) { + err = "Too few inodes for current use"; goto out; + } } - error = 0; - if (ctx.seen & SHMEM_SEEN_HUGE) - sbinfo->huge = ctx.huge; - if (ctx.seen & SHMEM_SEEN_BLOCKS) - sbinfo->max_blocks = ctx.blocks; - if (ctx.seen & SHMEM_SEEN_INODES) { - sbinfo->max_inodes = ctx.inodes; - sbinfo->free_inodes = ctx.inodes - inodes; + if (ctx->seen & SHMEM_SEEN_HUGE) + sbinfo->huge = ctx->huge; + if (ctx->seen & SHMEM_SEEN_BLOCKS) + sbinfo->max_blocks = ctx->blocks; + if (ctx->seen & SHMEM_SEEN_INODES) { + sbinfo->max_inodes = ctx->inodes; + sbinfo->free_inodes = ctx->inodes - inodes; } /* * Preserve previous mempolicy unless mpol remount option was specified. */ - if (ctx.mpol) { + if (ctx->mpol) { mpol_put(sbinfo->mpol); - sbinfo->mpol = ctx.mpol; /* transfers initial ref */ + sbinfo->mpol = ctx->mpol; /* transfers initial ref */ + ctx->mpol = NULL; } + spin_unlock(&sbinfo->stat_lock); + return 0; out: spin_unlock(&sbinfo->stat_lock); - return error; + return invalf(fc, "tmpfs: %s", err); } static int shmem_show_options(struct seq_file *seq, struct dentry *root) @@ -3623,13 +3616,11 @@ static void shmem_put_super(struct super_block *sb) sb->s_fs_info = NULL; } -static int shmem_fill_super(struct super_block *sb, void *data, int silent) +static int shmem_fill_super(struct super_block *sb, struct fs_context *fc) { + struct shmem_options *ctx = fc->fs_private; struct inode *inode; struct shmem_sb_info *sbinfo; - struct shmem_options ctx = {.mode = 0777 | S_ISVTX, - .uid = current_fsuid(), - .gid = current_fsgid()}; int err = -ENOMEM; /* Round up to L1_CACHE_BYTES to resist false sharing */ @@ -3647,12 +3638,10 @@ static int shmem_fill_super(struct super_block *sb, void *data, int silent) * but the internal instance is left unlimited. */ if (!(sb->s_flags & SB_KERNMOUNT)) { - ctx.blocks = shmem_default_max_blocks(); - ctx.inodes = shmem_default_max_inodes(); - if (shmem_parse_options(data, &ctx)) { - err = -EINVAL; - goto failed; - } + if (!(ctx->seen & SHMEM_SEEN_BLOCKS)) + ctx->blocks = shmem_default_max_blocks(); + if (!(ctx->seen & SHMEM_SEEN_INODES)) + ctx->inodes = shmem_default_max_inodes(); } else { sb->s_flags |= SB_NOUSER; } @@ -3661,13 +3650,14 @@ static int shmem_fill_super(struct super_block *sb, void *data, int silent) #else sb->s_flags |= SB_NOUSER; #endif - sbinfo->max_blocks = ctx.blocks; - sbinfo->free_inodes = sbinfo->max_inodes = ctx.inodes; - sbinfo->uid = ctx.uid; - sbinfo->gid = ctx.gid; - sbinfo->mode = ctx.mode; - sbinfo->huge = ctx.huge; - sbinfo->mpol = ctx.mpol; + sbinfo->max_blocks = ctx->blocks; + sbinfo->free_inodes = sbinfo->max_inodes = ctx->inodes; + sbinfo->uid = ctx->uid; + sbinfo->gid = ctx->gid; + sbinfo->mode = ctx->mode; + sbinfo->huge = ctx->huge; + sbinfo->mpol = ctx->mpol; + ctx->mpol = NULL; spin_lock_init(&sbinfo->stat_lock); if (percpu_counter_init(&sbinfo->used_blocks, 0, GFP_KERNEL)) @@ -3704,6 +3694,31 @@ failed: return err; } +static int shmem_get_tree(struct fs_context *fc) +{ + return get_tree_nodev(fc, shmem_fill_super); +} + +static void shmem_free_fc(struct fs_context *fc) +{ + struct shmem_options *ctx = fc->fs_private; + + if (ctx) { + mpol_put(ctx->mpol); + kfree(ctx); + } +} + +static const struct fs_context_operations shmem_fs_context_ops = { + .free = shmem_free_fc, + .get_tree = shmem_get_tree, +#ifdef CONFIG_TMPFS + .parse_monolithic = shmem_parse_options, + .parse_param = shmem_parse_one, + .reconfigure = shmem_reconfigure, +#endif +}; + static struct kmem_cache *shmem_inode_cachep; static struct inode *shmem_alloc_inode(struct super_block *sb) @@ -3820,7 +3835,6 @@ static const struct super_operations shmem_ops = { .destroy_inode = shmem_destroy_inode, #ifdef CONFIG_TMPFS .statfs = shmem_statfs, - .remount_fs = shmem_remount_fs, .show_options = shmem_show_options, #endif .evict_inode = shmem_evict_inode, @@ -3841,16 +3855,30 @@ static const struct vm_operations_struct shmem_vm_ops = { #endif }; -struct dentry *shmem_mount(struct file_system_type *fs_type, - int flags, const char *dev_name, void *data) +int shmem_init_fs_context(struct fs_context *fc) { - return mount_nodev(fs_type, flags, data, shmem_fill_super); + struct shmem_options *ctx; + + ctx = kzalloc(sizeof(struct shmem_options), GFP_KERNEL); + if (!ctx) + return -ENOMEM; + + ctx->mode = 0777 | S_ISVTX; + ctx->uid = current_fsuid(); + ctx->gid = current_fsgid(); + + fc->fs_private = ctx; + fc->ops = &shmem_fs_context_ops; + return 0; } static struct file_system_type shmem_fs_type = { .owner = THIS_MODULE, .name = "tmpfs", - .mount = shmem_mount, + .init_fs_context = shmem_init_fs_context, +#ifdef CONFIG_TMPFS + .parameters = &shmem_fs_parameters, +#endif .kill_sb = kill_litter_super, .fs_flags = FS_USERNS_MOUNT, }; @@ -3994,7 +4022,8 @@ bool shmem_huge_enabled(struct vm_area_struct *vma) static struct file_system_type shmem_fs_type = { .name = "tmpfs", - .mount = ramfs_mount, + .init_fs_context = ramfs_init_fs_context, + .parameters = &ramfs_fs_parameters, .kill_sb = kill_litter_super, .fs_flags = FS_USERNS_MOUNT, }; |