simple_read_from_buffer(9)

✨ NAME ✨

bestie, welcome to the simple_read_from_buffer(9) page from the Kernel API Manual — here’s the tea: simple_read_from_buffer copies data from the buffer to user space 💖

🌸 SYNOPSIS 🌸

ssize_t simple_read_from_buffer (void __user *to , size_t count , loff_t
*ppos , const void *from , size_t available );

🎀 ARGUMENTS 🎀

• to — the user space buffer to read to, aka where the data is going 💅
• count — the maximum number of bytes to read, like the byte budget bestie 🫶
• ppos — the current position in the buffer, the little “where are we” pointer ✨
• from — the buffer to read from, the source of the data 🦋
• available — the size of the buffer, so everyone knows how much room we’re working with 🌸

💖 DESCRIPTION 💖

okay so simple_read_from_buffer reads up to count bytes from the buffer from at offset ppos into the user space address starting at to. literally the whole vibe is “copy data from the buffer to user space” ✨

On success, the number of bytes read is returned and the offset ppos is advanced by this number, or negative value is returned on error. no cap, those are the rules 💅

🦋 SEE ALSO 🦋

Kernel file ./fs/libfs.c and these icon functions:

• simple_offset_init(9)
• simple_offset_add(9)
• simple_offset_remove(9)
• simple_offset_rename(9)
• simple_offset_rename_exchange(9)
• simple_offset_destroy(9)
• offset_dir_llseek(9)
• offset_readdir(9)
• simple_rename_timestamp(9)
• simple_setattr(9)
• simple_write_end(9)
• simple_write_to_buffer(9)
• memory_read_from_buffer(9)
• generic_encode_ino32_fh(9)
• generic_fh_to_dentry(9)
• generic_fh_to_parent(9)
• simple_fsync_noflush(9)
• simple_fsync(9)
• generic_check_addressable(9)
• simple_get_link(9)
• generic_ci_d_compare(9)
• generic_ci_d_hash(9)
• generic_ci_match(9)
• generic_set_sb_d_ops(9)
• inode_maybe_inc_iversion(9)
• inode_query_iversion(9)
• simple_inode_init_ts(9)
• path_from_stashed(9)
• simple_start_creating(9)

xoxo, your kernel bestie 💅 — source/version: ./fs, date: October 2026 🫶