fs/fat: add support for FIOC_FILEPATH ioctl #18107
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acassis
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Jan 22, 2026
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@Gary-Hobson please consider including a testing at apps/testing/fs/fat. We will need it to test all NuttX features later |
jerpelea
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Jan 22, 2026
michallenc
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Jan 22, 2026
GUIDINGLI
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Jan 22, 2026
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why not use fatfs in your project, it is more recommend
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fatfs is not included in the nuttx codebase. |
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@GUIDINGLI the FAT FS from NuttX was implemented from scratch by Greg, and although it could miss one or other feature from FatFS (exFAT is the most important one), NuttX implementation is better for low end devices and also since it is a different implementation some BUGs found on FatFS will not affect our implementation. |
This patch adds support for the FIOC_FILEPATH ioctl command in the FAT filesystem, allowing applications to retrieve the full path of an open file descriptor. Key features: - Implements fat_getfilepath() to construct file paths by traversing parent directories using ".." entries - Adds fat_findlfnstart() helper to locate the start of LFN sequences - Supports both FAT12/16 and FAT32 filesystem types - Handles both regular directories and root directory traversal This functionality is useful for debugging, logging, and applications that need to track file paths at runtime. Signed-off-by: yinshengkai <yinshengkai@bytedance.com>
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jerpelea
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Jan 23, 2026
xiaoxiang781216
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Jan 23, 2026
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@Gary-Hobson please take a look at this error: Seems like this PR increase the size of sam3u-ek |
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Summary
This PR adds support for the FIOC_FILEPATH ioctl command in the FAT filesystem, enabling applications to retrieve the full path of an open file descriptor.
Implementation Details
Key features implemented:
Use Cases
This functionality is valuable for:
Testing
The implementation has been tested on FAT32 filesystems and correctly handles: