memory_read_from_buffer(9)

💖 memory_read_from_buffer(9) 💖

okay so bestie, welcome to the kernel API manual, this one's a <purple>kernel API manual</purple> page and it's all about memory_read_from_buffer — copy data from the buffer. that's the whole name, no notes. 🎀

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✨ SYNOPSIS ✨

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

there she is. five args, one return type, absolutely zero chill. 💅

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🌸 ARGUMENTS 🌸

• to — the kernel space buffer you're reading to. the destination, the moment, the main character. 🫶
• count — the maximum number of bytes to read. the ceiling. the limit. don't exceed it. ✨
• ppos — the current position in the buffer. like a little bookmark but for memory. 🔖
• from — the buffer you're reading from. the source. the origin story. 💜
• available — the size of the buffer. how much is actually in there. important. 💀

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🦋 DESCRIPTION 🦋

okay so the way this works 😭 — memory_read_from_buffer reads up to count bytes from the buffer from at offset ppos into the kernel space address starting at to. that's it. that's the function. simple, iconic, ate. 👑

on success, the number of bytes read is returned and the offset ppos gets advanced by this number. yep, she moves. ✨ or, if things go sideways, a negative value is returned on error. 😔

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🌈 SEE ALSO 🌈

so like, the whole fam is here. Kernel file ./fs/libfs.c is the home base, and honestly the friend group is huge:

• 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_read_from_buffer(9) — her sister fr fr, iykyk 👯
• simple_write_to_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)

like, every single one. no skips. we don't gatekeep here. 🧚

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tiny heads up bestie: ppos gets mutated by this call on success. it's not a read-only vibe, it's a glow-up-in-place. plan accordingly. 💅

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and that's the page!! 🎀 this one lives in the source dir ./fs, dated <yellow> October 2026 </yellow>, and it's filed under memory_read_from_buffer(9) — catch you in the next manpage, mwah 💖🦋✨