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Registered in England and Wales under Company Registration No. 3798903 Subject: [PATCH 17/34] procfs: Move proc_fill_super() to fs/proc/root.c [ver #12] From: David Howells To: viro@zeniv.linux.org.uk Cc: torvalds@linux-foundation.org, dhowells@redhat.com, ebiederm@xmission.com, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, mszeredi@redhat.com Date: Fri, 21 Sep 2018 17:32:27 +0100 Message-ID: <153754754793.17872.17561436000413099524.stgit@warthog.procyon.org.uk> In-Reply-To: <153754740781.17872.7869536526927736855.stgit@warthog.procyon.org.uk> References: <153754740781.17872.7869536526927736855.stgit@warthog.procyon.org.uk> User-Agent: StGit/unknown-version MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.27 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.32]); Fri, 21 Sep 2018 16:32:30 +0000 (UTC) Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Move proc_fill_super() to fs/proc/root.c as that's where the other superblock stuff is. Signed-off-by: David Howells --- fs/proc/inode.c | 49 +------------------------------------------------ fs/proc/internal.h | 4 +--- fs/proc/root.c | 48 +++++++++++++++++++++++++++++++++++++++++++++++- 3 files changed, 49 insertions(+), 52 deletions(-) diff --git a/fs/proc/inode.c b/fs/proc/inode.c index 8f121c476c07..9fdda2946554 100644 --- a/fs/proc/inode.c +++ b/fs/proc/inode.c @@ -24,7 +24,6 @@ #include #include #include -#include #include @@ -124,7 +123,7 @@ static int proc_show_options(struct seq_file *seq, struct dentry *root) return 0; } -static const struct super_operations proc_sops = { +const struct super_operations proc_sops = { .alloc_inode = proc_alloc_inode, .destroy_inode = proc_destroy_inode, .drop_inode = generic_delete_inode, @@ -490,49 +489,3 @@ struct inode *proc_get_inode(struct super_block *sb, struct proc_dir_entry *de) pde_put(de); return inode; } - -int proc_fill_super(struct super_block *s, void *data, size_t data_size, - int silent) -{ - struct pid_namespace *ns = get_pid_ns(s->s_fs_info); - struct inode *root_inode; - int ret; - - if (!proc_parse_options(data, ns)) - return -EINVAL; - - /* User space would break if executables or devices appear on proc */ - s->s_iflags |= SB_I_USERNS_VISIBLE | SB_I_NOEXEC | SB_I_NODEV; - s->s_flags |= SB_NODIRATIME | SB_NOSUID | SB_NOEXEC; - s->s_blocksize = 1024; - s->s_blocksize_bits = 10; - s->s_magic = PROC_SUPER_MAGIC; - s->s_op = &proc_sops; - s->s_time_gran = 1; - - /* - * procfs isn't actually a stacking filesystem; however, there is - * too much magic going on inside it to permit stacking things on - * top of it - */ - s->s_stack_depth = FILESYSTEM_MAX_STACK_DEPTH; - - pde_get(&proc_root); - root_inode = proc_get_inode(s, &proc_root); - if (!root_inode) { - pr_err("proc_fill_super: get root inode failed\n"); - return -ENOMEM; - } - - s->s_root = d_make_root(root_inode); - if (!s->s_root) { - pr_err("proc_fill_super: allocate dentry failed\n"); - return -ENOMEM; - } - - ret = proc_setup_self(s); - if (ret) { - return ret; - } - return proc_setup_thread_self(s); -} diff --git a/fs/proc/internal.h b/fs/proc/internal.h index 3b88db52d206..912cb2cd29dd 100644 --- a/fs/proc/internal.h +++ b/fs/proc/internal.h @@ -205,13 +205,12 @@ struct pde_opener { struct completion *c; } __randomize_layout; extern const struct inode_operations proc_link_inode_operations; - extern const struct inode_operations proc_pid_link_inode_operations; +extern const struct super_operations proc_sops; void proc_init_kmemcache(void); void set_proc_pid_nlink(void); extern struct inode *proc_get_inode(struct super_block *, struct proc_dir_entry *); -extern int proc_fill_super(struct super_block *, void *, size_t, int); extern void proc_entry_rundown(struct proc_dir_entry *); /* @@ -269,7 +268,6 @@ static inline void proc_tty_init(void) {} * root.c */ extern struct proc_dir_entry proc_root; -extern int proc_parse_options(char *options, struct pid_namespace *pid); extern void proc_self_init(void); extern int proc_remount(struct super_block *, int *, char *, size_t); diff --git a/fs/proc/root.c b/fs/proc/root.c index 28fadb0c51ab..15da85cefd3f 100644 --- a/fs/proc/root.c +++ b/fs/proc/root.c @@ -23,6 +23,7 @@ #include #include #include +#include #include "internal.h" @@ -36,7 +37,7 @@ static const match_table_t tokens = { {Opt_err, NULL}, }; -int proc_parse_options(char *options, struct pid_namespace *pid) +static int proc_parse_options(char *options, struct pid_namespace *pid) { char *p; substring_t args[MAX_OPT_ARGS]; @@ -78,6 +79,51 @@ int proc_parse_options(char *options, struct pid_namespace *pid) return 1; } +static int proc_fill_super(struct super_block *s, void *data, size_t data_size, int silent) +{ + struct pid_namespace *ns = get_pid_ns(s->s_fs_info); + struct inode *root_inode; + int ret; + + if (!proc_parse_options(data, ns)) + return -EINVAL; + + /* User space would break if executables or devices appear on proc */ + s->s_iflags |= SB_I_USERNS_VISIBLE | SB_I_NOEXEC | SB_I_NODEV; + s->s_flags |= SB_NODIRATIME | SB_NOSUID | SB_NOEXEC; + s->s_blocksize = 1024; + s->s_blocksize_bits = 10; + s->s_magic = PROC_SUPER_MAGIC; + s->s_op = &proc_sops; + s->s_time_gran = 1; + + /* + * procfs isn't actually a stacking filesystem; however, there is + * too much magic going on inside it to permit stacking things on + * top of it + */ + s->s_stack_depth = FILESYSTEM_MAX_STACK_DEPTH; + + pde_get(&proc_root); + root_inode = proc_get_inode(s, &proc_root); + if (!root_inode) { + pr_err("proc_fill_super: get root inode failed\n"); + return -ENOMEM; + } + + s->s_root = d_make_root(root_inode); + if (!s->s_root) { + pr_err("proc_fill_super: allocate dentry failed\n"); + return -ENOMEM; + } + + ret = proc_setup_self(s); + if (ret) { + return ret; + } + return proc_setup_thread_self(s); +} + int proc_remount(struct super_block *sb, int *flags, char *data, size_t data_size) {