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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-18 17:39:57 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-18 17:39:57 +0000
commitdc50eab76b709d68175a358d6e23a5a3890764d3 (patch)
treec754d0390db060af0213ff994f0ac310e4cfd6e9 /fs/autofs/inode.c
parentAdding debian version 6.6.15-2. (diff)
downloadlinux-dc50eab76b709d68175a358d6e23a5a3890764d3.tar.xz
linux-dc50eab76b709d68175a358d6e23a5a3890764d3.zip
Merging upstream version 6.7.7.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'fs/autofs/inode.c')
-rw-r--r--fs/autofs/inode.c463
1 files changed, 269 insertions, 194 deletions
diff --git a/fs/autofs/inode.c b/fs/autofs/inode.c
index 2b49662ed2..1f5db68636 100644
--- a/fs/autofs/inode.c
+++ b/fs/autofs/inode.c
@@ -6,7 +6,6 @@
#include <linux/seq_file.h>
#include <linux/pagemap.h>
-#include <linux/parser.h>
#include "autofs_i.h"
@@ -110,189 +109,179 @@ static const struct super_operations autofs_sops = {
.evict_inode = autofs_evict_inode,
};
-enum {Opt_err, Opt_fd, Opt_uid, Opt_gid, Opt_pgrp, Opt_minproto, Opt_maxproto,
- Opt_indirect, Opt_direct, Opt_offset, Opt_strictexpire,
- Opt_ignore};
-
-static const match_table_t tokens = {
- {Opt_fd, "fd=%u"},
- {Opt_uid, "uid=%u"},
- {Opt_gid, "gid=%u"},
- {Opt_pgrp, "pgrp=%u"},
- {Opt_minproto, "minproto=%u"},
- {Opt_maxproto, "maxproto=%u"},
- {Opt_indirect, "indirect"},
- {Opt_direct, "direct"},
- {Opt_offset, "offset"},
- {Opt_strictexpire, "strictexpire"},
- {Opt_ignore, "ignore"},
- {Opt_err, NULL}
+enum {
+ Opt_direct,
+ Opt_fd,
+ Opt_gid,
+ Opt_ignore,
+ Opt_indirect,
+ Opt_maxproto,
+ Opt_minproto,
+ Opt_offset,
+ Opt_pgrp,
+ Opt_strictexpire,
+ Opt_uid,
};
-static int parse_options(char *options,
- struct inode *root, int *pgrp, bool *pgrp_set,
- struct autofs_sb_info *sbi)
+const struct fs_parameter_spec autofs_param_specs[] = {
+ fsparam_flag ("direct", Opt_direct),
+ fsparam_fd ("fd", Opt_fd),
+ fsparam_u32 ("gid", Opt_gid),
+ fsparam_flag ("ignore", Opt_ignore),
+ fsparam_flag ("indirect", Opt_indirect),
+ fsparam_u32 ("maxproto", Opt_maxproto),
+ fsparam_u32 ("minproto", Opt_minproto),
+ fsparam_flag ("offset", Opt_offset),
+ fsparam_u32 ("pgrp", Opt_pgrp),
+ fsparam_flag ("strictexpire", Opt_strictexpire),
+ fsparam_u32 ("uid", Opt_uid),
+ {}
+};
+
+struct autofs_fs_context {
+ kuid_t uid;
+ kgid_t gid;
+ int pgrp;
+ bool pgrp_set;
+};
+
+/*
+ * Open the fd. We do it here rather than in get_tree so that it's done in the
+ * context of the system call that passed the data and not the one that
+ * triggered the superblock creation, lest the fd gets reassigned.
+ */
+static int autofs_parse_fd(struct fs_context *fc, struct autofs_sb_info *sbi,
+ struct fs_parameter *param,
+ struct fs_parse_result *result)
{
- char *p;
- substring_t args[MAX_OPT_ARGS];
- int option;
- int pipefd = -1;
- kuid_t uid;
- kgid_t gid;
+ struct file *pipe;
+ int ret;
- root->i_uid = current_uid();
- root->i_gid = current_gid();
+ if (param->type == fs_value_is_file) {
+ /* came through the new api */
+ pipe = param->file;
+ param->file = NULL;
+ } else {
+ pipe = fget(result->uint_32);
+ }
+ if (!pipe) {
+ errorf(fc, "could not open pipe file descriptor");
+ return -EBADF;
+ }
- sbi->min_proto = AUTOFS_MIN_PROTO_VERSION;
- sbi->max_proto = AUTOFS_MAX_PROTO_VERSION;
+ ret = autofs_check_pipe(pipe);
+ if (ret < 0) {
+ errorf(fc, "Invalid/unusable pipe");
+ if (param->type != fs_value_is_file)
+ fput(pipe);
+ return -EBADF;
+ }
- sbi->pipefd = -1;
+ autofs_set_packet_pipe_flags(pipe);
- if (!options)
- return 1;
-
- while ((p = strsep(&options, ",")) != NULL) {
- int token;
-
- if (!*p)
- continue;
-
- token = match_token(p, tokens, args);
- switch (token) {
- case Opt_fd:
- if (match_int(args, &pipefd))
- return 1;
- sbi->pipefd = pipefd;
- break;
- case Opt_uid:
- if (match_int(args, &option))
- return 1;
- uid = make_kuid(current_user_ns(), option);
- if (!uid_valid(uid))
- return 1;
- root->i_uid = uid;
- break;
- case Opt_gid:
- if (match_int(args, &option))
- return 1;
- gid = make_kgid(current_user_ns(), option);
- if (!gid_valid(gid))
- return 1;
- root->i_gid = gid;
- break;
- case Opt_pgrp:
- if (match_int(args, &option))
- return 1;
- *pgrp = option;
- *pgrp_set = true;
- break;
- case Opt_minproto:
- if (match_int(args, &option))
- return 1;
- sbi->min_proto = option;
- break;
- case Opt_maxproto:
- if (match_int(args, &option))
- return 1;
- sbi->max_proto = option;
- break;
- case Opt_indirect:
- set_autofs_type_indirect(&sbi->type);
- break;
- case Opt_direct:
- set_autofs_type_direct(&sbi->type);
- break;
- case Opt_offset:
- set_autofs_type_offset(&sbi->type);
- break;
- case Opt_strictexpire:
- sbi->flags |= AUTOFS_SBI_STRICTEXPIRE;
- break;
- case Opt_ignore:
- sbi->flags |= AUTOFS_SBI_IGNORE;
- break;
- default:
- return 1;
- }
+ if (sbi->pipe)
+ fput(sbi->pipe);
+
+ sbi->pipefd = result->uint_32;
+ sbi->pipe = pipe;
+
+ return 0;
+}
+
+static int autofs_parse_param(struct fs_context *fc, struct fs_parameter *param)
+{
+ struct autofs_fs_context *ctx = fc->fs_private;
+ struct autofs_sb_info *sbi = fc->s_fs_info;
+ struct fs_parse_result result;
+ kuid_t uid;
+ kgid_t gid;
+ int opt;
+
+ opt = fs_parse(fc, autofs_param_specs, param, &result);
+ if (opt < 0)
+ return opt;
+
+ switch (opt) {
+ case Opt_fd:
+ return autofs_parse_fd(fc, sbi, param, &result);
+ case Opt_uid:
+ uid = make_kuid(current_user_ns(), result.uint_32);
+ if (!uid_valid(uid))
+ return invalfc(fc, "Invalid uid");
+ ctx->uid = uid;
+ break;
+ case Opt_gid:
+ gid = make_kgid(current_user_ns(), result.uint_32);
+ if (!gid_valid(gid))
+ return invalfc(fc, "Invalid gid");
+ ctx->gid = gid;
+ break;
+ case Opt_pgrp:
+ ctx->pgrp = result.uint_32;
+ ctx->pgrp_set = true;
+ break;
+ case Opt_minproto:
+ sbi->min_proto = result.uint_32;
+ break;
+ case Opt_maxproto:
+ sbi->max_proto = result.uint_32;
+ break;
+ case Opt_indirect:
+ set_autofs_type_indirect(&sbi->type);
+ break;
+ case Opt_direct:
+ set_autofs_type_direct(&sbi->type);
+ break;
+ case Opt_offset:
+ set_autofs_type_offset(&sbi->type);
+ break;
+ case Opt_strictexpire:
+ sbi->flags |= AUTOFS_SBI_STRICTEXPIRE;
+ break;
+ case Opt_ignore:
+ sbi->flags |= AUTOFS_SBI_IGNORE;
}
- return (sbi->pipefd < 0);
+
+ return 0;
}
-int autofs_fill_super(struct super_block *s, void *data, int silent)
+static struct autofs_sb_info *autofs_alloc_sbi(void)
{
- struct inode *root_inode;
- struct dentry *root;
- struct file *pipe;
struct autofs_sb_info *sbi;
- struct autofs_info *ino;
- int pgrp = 0;
- bool pgrp_set = false;
- int ret = -EINVAL;
sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
if (!sbi)
- return -ENOMEM;
- pr_debug("starting up, sbi = %p\n", sbi);
+ return NULL;
- s->s_fs_info = sbi;
sbi->magic = AUTOFS_SBI_MAGIC;
- sbi->pipefd = -1;
- sbi->pipe = NULL;
- sbi->exp_timeout = 0;
- sbi->oz_pgrp = NULL;
- sbi->sb = s;
- sbi->version = 0;
- sbi->sub_version = 0;
sbi->flags = AUTOFS_SBI_CATATONIC;
+ sbi->min_proto = AUTOFS_MIN_PROTO_VERSION;
+ sbi->max_proto = AUTOFS_MAX_PROTO_VERSION;
+ sbi->pipefd = -1;
+
set_autofs_type_indirect(&sbi->type);
- sbi->min_proto = 0;
- sbi->max_proto = 0;
mutex_init(&sbi->wq_mutex);
mutex_init(&sbi->pipe_mutex);
spin_lock_init(&sbi->fs_lock);
- sbi->queues = NULL;
spin_lock_init(&sbi->lookup_lock);
INIT_LIST_HEAD(&sbi->active_list);
INIT_LIST_HEAD(&sbi->expiring_list);
- s->s_blocksize = 1024;
- s->s_blocksize_bits = 10;
- s->s_magic = AUTOFS_SUPER_MAGIC;
- s->s_op = &autofs_sops;
- s->s_d_op = &autofs_dentry_operations;
- s->s_time_gran = 1;
-
- /*
- * Get the root inode and dentry, but defer checking for errors.
- */
- ino = autofs_new_ino(sbi);
- if (!ino) {
- ret = -ENOMEM;
- goto fail_free;
- }
- root_inode = autofs_get_inode(s, S_IFDIR | 0755);
- root = d_make_root(root_inode);
- if (!root) {
- ret = -ENOMEM;
- goto fail_ino;
- }
- pipe = NULL;
- root->d_fsdata = ino;
+ return sbi;
+}
- /* Can this call block? */
- if (parse_options(data, root_inode, &pgrp, &pgrp_set, sbi)) {
- pr_err("called with bogus options\n");
- goto fail_dput;
- }
+static int autofs_validate_protocol(struct fs_context *fc)
+{
+ struct autofs_sb_info *sbi = fc->s_fs_info;
/* Test versions first */
if (sbi->max_proto < AUTOFS_MIN_PROTO_VERSION ||
sbi->min_proto > AUTOFS_MAX_PROTO_VERSION) {
- pr_err("kernel does not match daemon version "
+ errorf(fc, "kernel does not match daemon version "
"daemon (%d, %d) kernel (%d, %d)\n",
sbi->min_proto, sbi->max_proto,
AUTOFS_MIN_PROTO_VERSION, AUTOFS_MAX_PROTO_VERSION);
- goto fail_dput;
+ return -EINVAL;
}
/* Establish highest kernel protocol version */
@@ -300,62 +289,148 @@ int autofs_fill_super(struct super_block *s, void *data, int silent)
sbi->version = AUTOFS_MAX_PROTO_VERSION;
else
sbi->version = sbi->max_proto;
- sbi->sub_version = AUTOFS_PROTO_SUBVERSION;
-
- if (pgrp_set) {
- sbi->oz_pgrp = find_get_pid(pgrp);
- if (!sbi->oz_pgrp) {
- pr_err("could not find process group %d\n",
- pgrp);
- goto fail_dput;
- }
- } else {
- sbi->oz_pgrp = get_task_pid(current, PIDTYPE_PGID);
+
+ switch (sbi->version) {
+ case 4:
+ sbi->sub_version = 7;
+ break;
+ case 5:
+ sbi->sub_version = AUTOFS_PROTO_SUBVERSION;
+ break;
+ default:
+ sbi->sub_version = 0;
}
- if (autofs_type_trigger(sbi->type))
- __managed_dentry_set_managed(root);
+ return 0;
+}
+static int autofs_fill_super(struct super_block *s, struct fs_context *fc)
+{
+ struct autofs_fs_context *ctx = fc->fs_private;
+ struct autofs_sb_info *sbi = s->s_fs_info;
+ struct inode *root_inode;
+ struct autofs_info *ino;
+
+ pr_debug("starting up, sbi = %p\n", sbi);
+
+ sbi->sb = s;
+ s->s_blocksize = 1024;
+ s->s_blocksize_bits = 10;
+ s->s_magic = AUTOFS_SUPER_MAGIC;
+ s->s_op = &autofs_sops;
+ s->s_d_op = &autofs_dentry_operations;
+ s->s_time_gran = 1;
+
+ /*
+ * Get the root inode and dentry, but defer checking for errors.
+ */
+ ino = autofs_new_ino(sbi);
+ if (!ino)
+ return -ENOMEM;
+
+ root_inode = autofs_get_inode(s, S_IFDIR | 0755);
+ if (!root_inode)
+ return -ENOMEM;
+
+ root_inode->i_uid = ctx->uid;
+ root_inode->i_gid = ctx->gid;
root_inode->i_fop = &autofs_root_operations;
root_inode->i_op = &autofs_dir_inode_operations;
+ s->s_root = d_make_root(root_inode);
+ if (unlikely(!s->s_root)) {
+ autofs_free_ino(ino);
+ return -ENOMEM;
+ }
+ s->s_root->d_fsdata = ino;
+
+ if (ctx->pgrp_set) {
+ sbi->oz_pgrp = find_get_pid(ctx->pgrp);
+ if (!sbi->oz_pgrp)
+ return invalf(fc, "Could not find process group %d",
+ ctx->pgrp);
+ } else
+ sbi->oz_pgrp = get_task_pid(current, PIDTYPE_PGID);
+
+ if (autofs_type_trigger(sbi->type))
+ /* s->s_root won't be contended so there's little to
+ * be gained by not taking the d_lock when setting
+ * d_flags, even when a lot mounts are being done.
+ */
+ managed_dentry_set_managed(s->s_root);
+
pr_debug("pipe fd = %d, pgrp = %u\n",
sbi->pipefd, pid_nr(sbi->oz_pgrp));
- pipe = fget(sbi->pipefd);
- if (!pipe) {
- pr_err("could not open pipe file descriptor\n");
- goto fail_put_pid;
- }
- ret = autofs_prepare_pipe(pipe);
- if (ret < 0)
- goto fail_fput;
- sbi->pipe = pipe;
sbi->flags &= ~AUTOFS_SBI_CATATONIC;
+ return 0;
+}
- /*
- * Success! Install the root dentry now to indicate completion.
- */
- s->s_root = root;
+/*
+ * Validate the parameters and then request a superblock.
+ */
+static int autofs_get_tree(struct fs_context *fc)
+{
+ struct autofs_sb_info *sbi = fc->s_fs_info;
+ int ret;
+
+ ret = autofs_validate_protocol(fc);
+ if (ret)
+ return ret;
+
+ if (sbi->pipefd < 0)
+ return invalf(fc, "No control pipe specified");
+
+ return get_tree_nodev(fc, autofs_fill_super);
+}
+
+static void autofs_free_fc(struct fs_context *fc)
+{
+ struct autofs_fs_context *ctx = fc->fs_private;
+ struct autofs_sb_info *sbi = fc->s_fs_info;
+
+ if (sbi) {
+ if (sbi->pipe)
+ fput(sbi->pipe);
+ kfree(sbi);
+ }
+ kfree(ctx);
+}
+
+static const struct fs_context_operations autofs_context_ops = {
+ .free = autofs_free_fc,
+ .parse_param = autofs_parse_param,
+ .get_tree = autofs_get_tree,
+};
+
+/*
+ * Set up the filesystem mount context.
+ */
+int autofs_init_fs_context(struct fs_context *fc)
+{
+ struct autofs_fs_context *ctx;
+ struct autofs_sb_info *sbi;
+
+ ctx = kzalloc(sizeof(struct autofs_fs_context), GFP_KERNEL);
+ if (!ctx)
+ goto nomem;
+
+ ctx->uid = current_uid();
+ ctx->gid = current_gid();
+
+ sbi = autofs_alloc_sbi();
+ if (!sbi)
+ goto nomem_ctx;
+
+ fc->fs_private = ctx;
+ fc->s_fs_info = sbi;
+ fc->ops = &autofs_context_ops;
return 0;
- /*
- * Failure ... clean up.
- */
-fail_fput:
- pr_err("pipe file descriptor does not contain proper ops\n");
- fput(pipe);
-fail_put_pid:
- put_pid(sbi->oz_pgrp);
-fail_dput:
- dput(root);
- goto fail_free;
-fail_ino:
- autofs_free_ino(ino);
-fail_free:
- kfree(sbi);
- s->s_fs_info = NULL;
- return ret;
+nomem_ctx:
+ kfree(ctx);
+nomem:
+ return -ENOMEM;
}
struct inode *autofs_get_inode(struct super_block *sb, umode_t mode)
@@ -370,7 +445,7 @@ struct inode *autofs_get_inode(struct super_block *sb, umode_t mode)
inode->i_uid = d_inode(sb->s_root)->i_uid;
inode->i_gid = d_inode(sb->s_root)->i_gid;
}
- inode->i_atime = inode->i_mtime = inode_set_ctime_current(inode);
+ simple_inode_init_ts(inode);
inode->i_ino = get_next_ino();
if (S_ISDIR(mode)) {