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author | Linus Torvalds <torvalds@linux-foundation.org> | 2019-09-24 22:33:34 +0300 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2019-09-24 22:33:34 +0300 |
commit | 0b36c9eed232760fbf51921818f48b3699f1f1ca (patch) | |
tree | 1392ebcd076e87f7c80cd93e29db7acbee542071 /drivers | |
parent | 722e6f500ac72d0d43955710738a24fd957607a4 (diff) | |
parent | 1f52aa08d12f8d359e71b4bfd73ca9d5d668e4da (diff) | |
download | linux-0b36c9eed232760fbf51921818f48b3699f1f1ca.tar.xz |
Merge branch 'work.mount3' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Pull more mount API conversions from Al Viro:
"Assorted conversions of options parsing to new API.
gfs2 is probably the most serious one here; the rest is trivial stuff.
Other things in what used to be #work.mount are going to wait for the
next cycle (and preferably go via git trees of the filesystems
involved)"
* 'work.mount3' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
gfs2: Convert gfs2 to fs_context
vfs: Convert spufs to use the new mount API
vfs: Convert hypfs to use the new mount API
hypfs: Fix error number left in struct pointer member
vfs: Convert functionfs to use the new mount API
vfs: Convert bpf to use the new mount API
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/usb/gadget/function/f_fs.c | 233 |
1 files changed, 120 insertions, 113 deletions
diff --git a/drivers/usb/gadget/function/f_fs.c b/drivers/usb/gadget/function/f_fs.c index 213ff03c8a9f..59d9d512dcda 100644 --- a/drivers/usb/gadget/function/f_fs.c +++ b/drivers/usb/gadget/function/f_fs.c @@ -17,6 +17,7 @@ #include <linux/blkdev.h> #include <linux/pagemap.h> #include <linux/export.h> +#include <linux/fs_parser.h> #include <linux/hid.h> #include <linux/mm.h> #include <linux/module.h> @@ -1451,9 +1452,9 @@ struct ffs_sb_fill_data { struct ffs_data *ffs_data; }; -static int ffs_sb_fill(struct super_block *sb, void *_data, int silent) +static int ffs_sb_fill(struct super_block *sb, struct fs_context *fc) { - struct ffs_sb_fill_data *data = _data; + struct ffs_sb_fill_data *data = fc->fs_private; struct inode *inode; struct ffs_data *ffs = data->ffs_data; @@ -1486,147 +1487,152 @@ static int ffs_sb_fill(struct super_block *sb, void *_data, int silent) return 0; } -static int ffs_fs_parse_opts(struct ffs_sb_fill_data *data, char *opts) -{ - ENTER(); +enum { + Opt_no_disconnect, + Opt_rmode, + Opt_fmode, + Opt_mode, + Opt_uid, + Opt_gid, +}; - if (!opts || !*opts) - return 0; +static const struct fs_parameter_spec ffs_fs_param_specs[] = { + fsparam_bool ("no_disconnect", Opt_no_disconnect), + fsparam_u32 ("rmode", Opt_rmode), + fsparam_u32 ("fmode", Opt_fmode), + fsparam_u32 ("mode", Opt_mode), + fsparam_u32 ("uid", Opt_uid), + fsparam_u32 ("gid", Opt_gid), + {} +}; - for (;;) { - unsigned long value; - char *eq, *comma; - - /* Option limit */ - comma = strchr(opts, ','); - if (comma) - *comma = 0; - - /* Value limit */ - eq = strchr(opts, '='); - if (unlikely(!eq)) { - pr_err("'=' missing in %s\n", opts); - return -EINVAL; - } - *eq = 0; +static const struct fs_parameter_description ffs_fs_fs_parameters = { + .name = "kAFS", + .specs = ffs_fs_param_specs, +}; - /* Parse value */ - if (kstrtoul(eq + 1, 0, &value)) { - pr_err("%s: invalid value: %s\n", opts, eq + 1); - return -EINVAL; - } +static int ffs_fs_parse_param(struct fs_context *fc, struct fs_parameter *param) +{ + struct ffs_sb_fill_data *data = fc->fs_private; + struct fs_parse_result result; + int opt; - /* Interpret option */ - switch (eq - opts) { - case 13: - if (!memcmp(opts, "no_disconnect", 13)) - data->no_disconnect = !!value; - else - goto invalid; - break; - case 5: - if (!memcmp(opts, "rmode", 5)) - data->root_mode = (value & 0555) | S_IFDIR; - else if (!memcmp(opts, "fmode", 5)) - data->perms.mode = (value & 0666) | S_IFREG; - else - goto invalid; - break; + ENTER(); - case 4: - if (!memcmp(opts, "mode", 4)) { - data->root_mode = (value & 0555) | S_IFDIR; - data->perms.mode = (value & 0666) | S_IFREG; - } else { - goto invalid; - } - break; + opt = fs_parse(fc, &ffs_fs_fs_parameters, param, &result); + if (opt < 0) + return opt; - case 3: - if (!memcmp(opts, "uid", 3)) { - data->perms.uid = make_kuid(current_user_ns(), value); - if (!uid_valid(data->perms.uid)) { - pr_err("%s: unmapped value: %lu\n", opts, value); - return -EINVAL; - } - } else if (!memcmp(opts, "gid", 3)) { - data->perms.gid = make_kgid(current_user_ns(), value); - if (!gid_valid(data->perms.gid)) { - pr_err("%s: unmapped value: %lu\n", opts, value); - return -EINVAL; - } - } else { - goto invalid; - } - break; + switch (opt) { + case Opt_no_disconnect: + data->no_disconnect = result.boolean; + break; + case Opt_rmode: + data->root_mode = (result.uint_32 & 0555) | S_IFDIR; + break; + case Opt_fmode: + data->perms.mode = (result.uint_32 & 0666) | S_IFREG; + break; + case Opt_mode: + data->root_mode = (result.uint_32 & 0555) | S_IFDIR; + data->perms.mode = (result.uint_32 & 0666) | S_IFREG; + break; - default: -invalid: - pr_err("%s: invalid option\n", opts); - return -EINVAL; - } + case Opt_uid: + data->perms.uid = make_kuid(current_user_ns(), result.uint_32); + if (!uid_valid(data->perms.uid)) + goto unmapped_value; + break; + case Opt_gid: + data->perms.gid = make_kgid(current_user_ns(), result.uint_32); + if (!gid_valid(data->perms.gid)) + goto unmapped_value; + break; - /* Next iteration */ - if (!comma) - break; - opts = comma + 1; + default: + return -ENOPARAM; } return 0; -} -/* "mount -t functionfs dev_name /dev/function" ends up here */ +unmapped_value: + return invalf(fc, "%s: unmapped value: %u", param->key, result.uint_32); +} -static struct dentry * -ffs_fs_mount(struct file_system_type *t, int flags, - const char *dev_name, void *opts) -{ - struct ffs_sb_fill_data data = { - .perms = { - .mode = S_IFREG | 0600, - .uid = GLOBAL_ROOT_UID, - .gid = GLOBAL_ROOT_GID, - }, - .root_mode = S_IFDIR | 0500, - .no_disconnect = false, - }; - struct dentry *rv; - int ret; +/* + * Set up the superblock for a mount. + */ +static int ffs_fs_get_tree(struct fs_context *fc) +{ + struct ffs_sb_fill_data *ctx = fc->fs_private; void *ffs_dev; struct ffs_data *ffs; ENTER(); - ret = ffs_fs_parse_opts(&data, opts); - if (unlikely(ret < 0)) - return ERR_PTR(ret); + if (!fc->source) + return invalf(fc, "No source specified"); - ffs = ffs_data_new(dev_name); + ffs = ffs_data_new(fc->source); if (unlikely(!ffs)) - return ERR_PTR(-ENOMEM); - ffs->file_perms = data.perms; - ffs->no_disconnect = data.no_disconnect; + return -ENOMEM; + ffs->file_perms = ctx->perms; + ffs->no_disconnect = ctx->no_disconnect; - ffs->dev_name = kstrdup(dev_name, GFP_KERNEL); + ffs->dev_name = kstrdup(fc->source, GFP_KERNEL); if (unlikely(!ffs->dev_name)) { ffs_data_put(ffs); - return ERR_PTR(-ENOMEM); + return -ENOMEM; } - ffs_dev = ffs_acquire_dev(dev_name); + ffs_dev = ffs_acquire_dev(ffs->dev_name); if (IS_ERR(ffs_dev)) { ffs_data_put(ffs); - return ERR_CAST(ffs_dev); + return PTR_ERR(ffs_dev); } + ffs->private_data = ffs_dev; - data.ffs_data = ffs; + ctx->ffs_data = ffs; + return get_tree_nodev(fc, ffs_sb_fill); +} + +static void ffs_fs_free_fc(struct fs_context *fc) +{ + struct ffs_sb_fill_data *ctx = fc->fs_private; + + if (ctx) { + if (ctx->ffs_data) { + ffs_release_dev(ctx->ffs_data); + ffs_data_put(ctx->ffs_data); + } - rv = mount_nodev(t, flags, &data, ffs_sb_fill); - if (IS_ERR(rv) && data.ffs_data) { - ffs_release_dev(data.ffs_data); - ffs_data_put(data.ffs_data); + kfree(ctx); } - return rv; +} + +static const struct fs_context_operations ffs_fs_context_ops = { + .free = ffs_fs_free_fc, + .parse_param = ffs_fs_parse_param, + .get_tree = ffs_fs_get_tree, +}; + +static int ffs_fs_init_fs_context(struct fs_context *fc) +{ + struct ffs_sb_fill_data *ctx; + + ctx = kzalloc(sizeof(struct ffs_sb_fill_data), GFP_KERNEL); + if (!ctx) + return -ENOMEM; + + ctx->perms.mode = S_IFREG | 0600; + ctx->perms.uid = GLOBAL_ROOT_UID; + ctx->perms.gid = GLOBAL_ROOT_GID; + ctx->root_mode = S_IFDIR | 0500; + ctx->no_disconnect = false; + + fc->fs_private = ctx; + fc->ops = &ffs_fs_context_ops; + return 0; } static void @@ -1644,7 +1650,8 @@ ffs_fs_kill_sb(struct super_block *sb) static struct file_system_type ffs_fs_type = { .owner = THIS_MODULE, .name = "functionfs", - .mount = ffs_fs_mount, + .init_fs_context = ffs_fs_init_fs_context, + .parameters = &ffs_fs_fs_parameters, .kill_sb = ffs_fs_kill_sb, }; MODULE_ALIAS_FS("functionfs"); |