STRUCT UBIFS_MOUNT_OPTS(9)

✨ struct ubifs_mount_opts(9) ✨

okay bestie, so this is a page from the Kernel API Manual, and it's all about struct ubifs_mount_opts — literally the place where UBIFS-specific mount options information lives. that's it, that's the whole vibe. it's giving "tiny struct, big responsibilities" 💅

🎀 SYNOPSIS 🎀

like, here's the whole thing, exactly as it is, no cap:

struct ubifs_mount_opts {
    unsigned int unmount_mode:2;
    unsigned int bulk_read:2;
    unsigned int chk_data_crc:2;
    unsigned int override_compr:1;
    unsigned int compr_type:2;
 };

look at all those bitfields, i'm obsessed 😭 it's a packed little queen.

🌸 Members 🌸

• unmount_mode — the selected unmount mode, periodt. the values are 0 default, 1 normal, 2 fast. pick your fighter ✨
• bulk_read — turns bulk-reads on or off. values: 0 default, 1 disable, 2 enable. so 0 isn't "off" bestie, it's "default", iykyk 🦋
• chk_data_crc — enables or disables CRC data checking when reading data nodes. values are 0 default, 1 disable, 2 enable. again, 0 = default, not disable. don't get it twisted 🙈
• override_compr — overrides the default compressor. 0 means do not override and use the superblock compressor; 1 means override and use the compressor specified in compr_type. main character energy 🔥
• compr_type — the compressor type you override the superblock compressor with (UBIFS_COMPR_NONE, etc). the "etc" is doing a lot of heavy lifting here but it's iconic 🌈

💖 SEE ALSO 💖

the kernel file ./fs/ubifs/ubifs.h, plus this whole friend group of structs and functions — yes, all of them, i'm not skipping a single one, we're listing every single bestie 💜:

struct ubifs_old_idx(9), struct ubifs_scan_node(9), struct ubifs_scan_leb(9), struct ubifs_gced_idx_leb(9), struct ubifs_inode(9), struct ubifs_unclean_leb(9), struct ubifs_lprops(9), struct ubifs_lpt_lprops(9), struct ubifs_lp_stats(9), struct ubifs_cnode(9), struct ubifs_pnode(9), struct ubifs_nbranch(9), struct ubifs_nnode(9), struct ubifs_lpt_heap(9), struct ubifs_wbuf(9), struct ubifs_bud(9), struct ubifs_jhead(9), struct ubifs_zbranch(9), struct ubifs_znode(9), struct bu_info(9), struct ubifs_node_range(9), struct ubifs_compressor(9), struct ubifs_budget_req(9), struct ubifs_orphan(9), struct ubifs_budg_info(9), struct ubifs_stats_info(9), struct ubifs_info(9), ubifs_check_hash(9), ubifs_check_hmac(9), ubifs_branch_hash(9), ubifs_copy_hash(9), ubifs_auth_node_sz(9)

lowkey a whole squad 🫶 go read them, they're all in ./fs/ubifs/ubifs.h and they ate 💅

and that's the page fr fr 🎀 — from the source ./fs/ubifs, version date October 2026, and the title is struct ubifs_mount_opts(9). now go mount something, bestie ⭐🍓