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convert functionfs

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All files are regular; ep0 is there all along, other ep* may appear
and go away during the filesystem lifetime; all of those are guaranteed
to be gone by the time we umount it.

Object creation is in ffs_sb_create_file(), removals - at ->kill_sb()
time (for ep0) or by simple_remove_by_name() from ffs_epfiles_destroy()
(for the rest of them).

Switch ffs_sb_create_file() to simple_start_creating()/d_make_persistent()/
simple_done_creating() and that's it.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro
2025-03-08 22:22:29 -05:00
parent c7747fafab
commit 6ca67378d0
1 changed files with 9 additions and 8 deletions
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17
drivers/usb/gadget/function/f_fs.c
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@@ -1899,17 +1899,18 @@ static int ffs_sb_create_file(struct super_block *sb, const char *name,
struct dentry *dentry;
struct inode *inode;
dentry = d_alloc_name(sb->s_root, name);
if (!dentry)
return -ENOMEM;
inode = ffs_sb_make_inode(sb, data, fops, NULL, &ffs->file_perms);
if (!inode) {
dput(dentry);
if (!inode)
return -ENOMEM;
dentry = simple_start_creating(sb->s_root, name);
if (IS_ERR(dentry)) {
iput(inode);
return PTR_ERR(dentry);
}
d_add(dentry, inode);
d_make_persistent(dentry, inode);
simple_done_creating(dentry);
return 0;
}
@@ -2098,7 +2099,7 @@ static void ffs_data_reset(struct ffs_data *ffs);
static void
ffs_fs_kill_sb(struct super_block *sb)
{
kill_litter_super(sb);
kill_anon_super(sb);
if (sb->s_fs_info) {
struct ffs_data *ffs = sb->s_fs_info;
ffs->state = FFS_CLOSING;