fs/ubifs/compress.c
Source file repositories/reference/linux-study-clean/fs/ubifs/compress.c
File Facts
- System
- Linux kernel
- Corpus path
fs/ubifs/compress.c- Extension
.c- Size
- 10240 bytes
- Lines
- 370
- Domain
- Core OS
- Bucket
- VFS And Filesystem Core
- Inferred role
- Core OS: implementation source
- Status
- source implementation candidate
Why This File Exists
Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.
- Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.
- Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.
Dependency Surface
crypto/acompress.hlinux/highmem.hubifs.h
Detected Declarations
function ubifs_compress_commonfunction ubifs_compressfunction ubifs_compress_foliofunction ubifs_decompress_commonfunction ubifs_decompressfunction ubifs_decompress_foliofunction compr_initfunction compr_exitfunction ubifs_compressors_initfunction ubifs_compressors_exit
Annotated Snippet
if (IS_ERR(compr->cc)) {
pr_err("UBIFS error (pid %d): cannot initialize compressor %s, error %ld",
current->pid, compr->name, PTR_ERR(compr->cc));
return PTR_ERR(compr->cc);
}
}
ubifs_compressors[compr->compr_type] = compr;
return 0;
}
/**
* compr_exit - de-initialize a compressor.
* @compr: compressor description object
*/
static void compr_exit(struct ubifs_compressor *compr)
{
if (compr->capi_name)
crypto_free_acomp(compr->cc);
}
/**
* ubifs_compressors_init - initialize UBIFS compressors.
*
* This function initializes the compressor which were compiled in. Returns
* zero in case of success and a negative error code in case of failure.
*/
int __init ubifs_compressors_init(void)
{
int err;
err = compr_init(&lzo_compr);
if (err)
return err;
err = compr_init(&zstd_compr);
if (err)
goto out_lzo;
err = compr_init(&zlib_compr);
if (err)
goto out_zstd;
ubifs_compressors[UBIFS_COMPR_NONE] = &none_compr;
return 0;
out_zstd:
compr_exit(&zstd_compr);
out_lzo:
compr_exit(&lzo_compr);
return err;
}
/**
* ubifs_compressors_exit - de-initialize UBIFS compressors.
*/
void ubifs_compressors_exit(void)
{
compr_exit(&lzo_compr);
compr_exit(&zlib_compr);
compr_exit(&zstd_compr);
}
Annotation
- Immediate include surface: `crypto/acompress.h`, `linux/highmem.h`, `ubifs.h`.
- Detected declarations: `function ubifs_compress_common`, `function ubifs_compress`, `function ubifs_compress_folio`, `function ubifs_decompress_common`, `function ubifs_decompress`, `function ubifs_decompress_folio`, `function compr_init`, `function compr_exit`, `function ubifs_compressors_init`, `function ubifs_compressors_exit`.
- Atlas domain: Core OS / VFS And Filesystem Core.
- Implementation status: source implementation candidate.
Implementation Notes
- This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
- Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
- Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.