31 lines
3.6 KiB
Markdown
31 lines
3.6 KiB
Markdown
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---
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obj: filesystem
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wiki: https://en.wikipedia.org/wiki/Tmpfs
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arch-wiki: https://wiki.archlinux.org/title/Tmpfs
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---
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# tmpFS
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tmpfs is a temporary filesystem that resides in memory and/or swap partition(s). Mounting directories as tmpfs can be an effective way of speeding up accesses to their files, or to ensure that their contents are automatically cleared upon reboot.
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## Usage
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**Create a tmpfs**:
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`mount -t tmpfs -o [OPTIONS] tmpfs [MOUNT_POINT]`
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**Resize a tmpfs**:
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`mount -t tmpfs -o remount,size=<NEW_SIZE> tmpfs [MOUNT_POINT]`
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### Options
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| **Option** | **Description** |
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| ------------------ | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
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| `size=bytes` | Specify an upper limit on the size of the filesystem. Size is given in bytes, rounded up to entire pages. A `k`, `m`, or `g` suffix can be used for Ki, Mi, or Gi. Use `%` to specify a percentage of physical RAM. Default: 50%. Set to `0` to remove the limit. |
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| `nr_blocks=blocks` | Similar to `size`, but in blocks of `PAGE_CACHE_SIZE`. Accepts `k`, `m`, or `g` suffixes, but not `%`. |
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| `nr_inodes=inodes` | Sets the maximum number of inodes. Default is half the number of physical RAM pages or the number of lowmem RAM pages (whichever is smaller). Use `k`, `m`, or `g` suffixes, but `%` is not supported. Set to `0` to remove the limit. |
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| `noswap` | Disables swap. Remounts must respect the original settings. By default, swap is enabled. |
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| `mode=mode` | Sets the initial permissions of the root directory. |
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| `gid=gid` | Sets the initial group ID of the root directory. |
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| `uid=uid` | Sets the initial user ID of the root directory. |
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| `huge=huge_option` | Sets the huge table memory allocation policy for all files (if `CONFIG_TRANSPARENT_HUGEPAGE` is enabled). Options: `never` (default), `always`, `within_size`, `advise`, `deny`, or `force`. |
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| `mpol=mpol_option` | Sets NUMA memory allocation policy (if `CONFIG_NUMA` is enabled). Options: `default`, `prefer:node`, `bind:nodelist`, `interleave`, `interleave:nodelist`, or `local`. Example: `mpol=bind:0-3,5,7,9-15`. |
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