b336e4a566
NBLKDEV was 16 for every disk and partition together, which a laptop's NVMe drive with its eight partitions and a USB stick come close to. The mount table held 8, SchFS 4 volumes and 4 snapshots, FAT 4 volumes. Now 32, 32, 16, 8 and 8; the device numbers still fit between the ones already fixed. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01S1giNvrHTrPMPw7V6x1kQ4
30 lines
1.4 KiB
C
30 lines
1.4 KiB
C
#pragma once
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// FAT12, FAT16 and FAT32, with VFAT long names: the filesystem every other
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// operating system can read, which is the whole reason to have it. A USB
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// stick, an EFI system partition, an SD card. See kernel/fs/fat/fat.c.
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//
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// Mounted the way Linux mounts it -- `mount -t vfat /dev/usb0p1 /mnt` -- and
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// "msdos" and "fat" are accepted as the same thing.
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// Filesystem device numbers for mounted FAT volumes. Like SCHFS_DEV, runtime
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// identities for the inode cache that nothing on disk records.
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#define FAT_VOL_SLOTS 8 // 104..111
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#define FAT_DEV 104
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#define FAT_IS_DEV(d) ((d) >= FAT_DEV && (d) < FAT_DEV + FAT_VOL_SLOTS)
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// The root directory's inode number on every FAT volume.
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#define FAT_ROOT_INO 1
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// Mount the FAT volume on block device `bdev`. Returns its filesystem device
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// number, or a negative errno: -ENODEV for no FAT there, -EBUSY for no free
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// slot or already mounted.
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int fat_kmount(uint bdev, int readonly);
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// Flush it, mark it cleanly unmounted, and let it go.
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int fat_kumount(uint dev);
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int fat_readonly(uint dev);
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// Write out everything dirty on every mounted volume. `final` also marks each
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// one clean, for a shutdown that will not get to unmount them.
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void fat_ksync_all(int final);
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// Cluster size, clusters and free clusters, for statfs. -1 if not FAT.
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int fat_kstatfs(uint dev, uint64 *bsize, uint64 *total, uint64 *freec);
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