diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2018-01-30 18:32:21 -0800 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2018-01-30 18:32:21 -0800 |
commit | 8b0fdf631cf6a31f60a9ed3e1c0f37a9715de807 (patch) | |
tree | 50bab0b8c054df37f397d581251ba7df1484e061 /kernel/bpf/inode.c | |
parent | 168fe32a072a4b8dc81a3aebf0e5e588d38e2955 (diff) | |
parent | 36735a6a2b5e042db1af956ce4bcc13f3ff99e21 (diff) |
Merge branch 'work.mqueue' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Pull mqueue/bpf vfs cleanups from Al Viro:
"mqueue and bpf go through rather painful and similar contortions to
create objects in their dentry trees. Provide a primitive for doing
that without abusing ->mknod(), switch bpf and mqueue to it.
Another mqueue-related thing that has ended up in that branch is
on-demand creation of internal mount (based upon the work of Giuseppe
Scrivano)"
* 'work.mqueue' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
mqueue: switch to on-demand creation of internal mount
tidy do_mq_open() up a bit
mqueue: clean prepare_open() up
do_mq_open(): move all work prior to dentry_open() into a helper
mqueue: fold mq_attr_ok() into mqueue_get_inode()
move dentry_open() calls up into do_mq_open()
mqueue: switch to vfs_mkobj(), quit abusing ->d_fsdata
bpf_obj_do_pin(): switch to vfs_mkobj(), quit abusing ->mknod()
new primitive: vfs_mkobj()
Diffstat (limited to 'kernel/bpf/inode.c')
-rw-r--r-- | kernel/bpf/inode.c | 50 |
1 files changed, 22 insertions, 28 deletions
diff --git a/kernel/bpf/inode.c b/kernel/bpf/inode.c index 5bb5e49ef4c3..81e2f6995adb 100644 --- a/kernel/bpf/inode.c +++ b/kernel/bpf/inode.c @@ -150,39 +150,29 @@ static int bpf_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) return 0; } -static int bpf_mkobj_ops(struct inode *dir, struct dentry *dentry, - umode_t mode, const struct inode_operations *iops) +static int bpf_mkobj_ops(struct dentry *dentry, umode_t mode, void *raw, + const struct inode_operations *iops) { - struct inode *inode; - - inode = bpf_get_inode(dir->i_sb, dir, mode | S_IFREG); + struct inode *dir = dentry->d_parent->d_inode; + struct inode *inode = bpf_get_inode(dir->i_sb, dir, mode); if (IS_ERR(inode)) return PTR_ERR(inode); inode->i_op = iops; - inode->i_private = dentry->d_fsdata; + inode->i_private = raw; bpf_dentry_finalize(dentry, inode, dir); return 0; } -static int bpf_mkobj(struct inode *dir, struct dentry *dentry, umode_t mode, - dev_t devt) +static int bpf_mkprog(struct dentry *dentry, umode_t mode, void *arg) { - enum bpf_type type = MINOR(devt); - - if (MAJOR(devt) != UNNAMED_MAJOR || !S_ISREG(mode) || - dentry->d_fsdata == NULL) - return -EPERM; + return bpf_mkobj_ops(dentry, mode, arg, &bpf_prog_iops); +} - switch (type) { - case BPF_TYPE_PROG: - return bpf_mkobj_ops(dir, dentry, mode, &bpf_prog_iops); - case BPF_TYPE_MAP: - return bpf_mkobj_ops(dir, dentry, mode, &bpf_map_iops); - default: - return -EPERM; - } +static int bpf_mkmap(struct dentry *dentry, umode_t mode, void *arg) +{ + return bpf_mkobj_ops(dentry, mode, arg, &bpf_map_iops); } static struct dentry * @@ -218,7 +208,6 @@ static int bpf_symlink(struct inode *dir, struct dentry *dentry, static const struct inode_operations bpf_dir_iops = { .lookup = bpf_lookup, - .mknod = bpf_mkobj, .mkdir = bpf_mkdir, .symlink = bpf_symlink, .rmdir = simple_rmdir, @@ -234,7 +223,6 @@ static int bpf_obj_do_pin(const struct filename *pathname, void *raw, struct inode *dir; struct path path; umode_t mode; - dev_t devt; int ret; dentry = kern_path_create(AT_FDCWD, pathname->name, &path, 0); @@ -242,9 +230,8 @@ static int bpf_obj_do_pin(const struct filename *pathname, void *raw, return PTR_ERR(dentry); mode = S_IFREG | ((S_IRUSR | S_IWUSR) & ~current_umask()); - devt = MKDEV(UNNAMED_MAJOR, type); - ret = security_path_mknod(&path, dentry, mode, devt); + ret = security_path_mknod(&path, dentry, mode, 0); if (ret) goto out; @@ -254,9 +241,16 @@ static int bpf_obj_do_pin(const struct filename *pathname, void *raw, goto out; } - dentry->d_fsdata = raw; - ret = vfs_mknod(dir, dentry, mode, devt); - dentry->d_fsdata = NULL; + switch (type) { + case BPF_TYPE_PROG: + ret = vfs_mkobj(dentry, mode, bpf_mkprog, raw); + break; + case BPF_TYPE_MAP: + ret = vfs_mkobj(dentry, mode, bpf_mkmap, raw); + break; + default: + ret = -EPERM; + } out: done_path_create(&path, dentry); return ret; |