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Merge pull request containers#185 from alexlarsson/decode-erofs
Add support for decoding erofs into lcfs_node, and some tooling using it
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SUBDIRS=libcomposefs tools | ||
SUBDIRS=libcomposefs tools tests | ||
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EXTRA_DIST=\ | ||
composefs.pc.in \ | ||
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/* lcfs | ||
Copyright (C) 2023 Alexander Larsson <[email protected]> | ||
This file is free software: you can redistribute it and/or modify | ||
it under the terms of the GNU Lesser General Public License as | ||
published by the Free Software Foundation; either version 2.1 of the | ||
License, or (at your option) any later version. | ||
This file is distributed in the hope that it will be useful, | ||
but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
GNU Lesser General Public License for more details. | ||
You should have received a copy of the GNU Lesser General Public License | ||
along with this program. If not, see <https://www.gnu.org/licenses/>. */ | ||
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#ifndef _LCFS_EROFS_INTERNAL_H | ||
#define _LCFS_EROFS_INTERNAL_H | ||
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#include <string.h> | ||
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#include "lcfs-internal.h" | ||
#include "lcfs-erofs.h" | ||
#include "erofs_fs_wrapper.h" | ||
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typedef union { | ||
__le16 i_format; | ||
struct erofs_inode_compact compact; | ||
struct erofs_inode_extended extended; | ||
} erofs_inode; | ||
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static const char *erofs_xattr_prefixes[] = { | ||
"", | ||
"user.", | ||
"system.posix_acl_access", | ||
"system.posix_acl_default", | ||
"trusted.", | ||
"lustre.", | ||
"security.", | ||
}; | ||
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static inline uint16_t erofs_inode_version(const erofs_inode *cino) | ||
{ | ||
uint16_t i_format = lcfs_u16_from_file(cino->i_format); | ||
return (i_format >> EROFS_I_VERSION_BIT) & EROFS_I_VERSION_MASK; | ||
} | ||
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static inline bool erofs_inode_is_compact(const erofs_inode *cino) | ||
{ | ||
return erofs_inode_version(cino) == 0; | ||
} | ||
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static inline uint16_t erofs_inode_datalayout(const erofs_inode *cino) | ||
{ | ||
uint16_t i_format = lcfs_u16_from_file(cino->i_format); | ||
return (i_format >> EROFS_I_DATALAYOUT_BIT) & EROFS_I_DATALAYOUT_MASK; | ||
} | ||
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static inline bool erofs_inode_is_tailpacked(const erofs_inode *cino) | ||
{ | ||
return erofs_inode_datalayout(cino) == EROFS_INODE_FLAT_INLINE; | ||
} | ||
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static inline bool erofs_inode_is_flat(const erofs_inode *cino) | ||
{ | ||
return erofs_inode_datalayout(cino) == EROFS_INODE_FLAT_INLINE || | ||
erofs_inode_datalayout(cino) == EROFS_INODE_FLAT_PLAIN; | ||
} | ||
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static inline size_t erofs_xattr_inode_size(uint16_t xattr_icount) | ||
{ | ||
size_t xattr_size = 0; | ||
if (xattr_icount > 0) | ||
xattr_size = sizeof(struct erofs_xattr_ibody_header) + | ||
(xattr_icount - 1) * 4; | ||
return xattr_size; | ||
} | ||
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#define EROFS_N_XATTR_PREFIXES (sizeof(erofs_xattr_prefixes) / sizeof(char *)) | ||
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static inline bool erofs_is_acl_xattr(int prefix, const char *name, size_t name_len) | ||
{ | ||
const char *const nfs_acl = "system.nfs4_acl"; | ||
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if ((prefix == EROFS_XATTR_INDEX_POSIX_ACL_ACCESS || | ||
prefix == EROFS_XATTR_INDEX_POSIX_ACL_DEFAULT) && | ||
name_len == 0) | ||
return true; | ||
if (prefix == 0 && name_len == strlen(nfs_acl) && | ||
memcmp(name, nfs_acl, strlen(nfs_acl)) == 0) | ||
return true; | ||
return false; | ||
} | ||
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static inline int erofs_get_xattr_prefix(const char *str) | ||
{ | ||
for (int i = 1; i < EROFS_N_XATTR_PREFIXES; i++) { | ||
const char *prefix = erofs_xattr_prefixes[i]; | ||
if (strlen(str) >= strlen(prefix) && | ||
memcmp(str, prefix, strlen(prefix)) == 0) { | ||
return i; | ||
} | ||
} | ||
return 0; | ||
} | ||
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static inline char *erofs_get_xattr_name(uint8_t index, const char *name, | ||
size_t name_len) | ||
{ | ||
char *res; | ||
const char *prefix; | ||
size_t prefix_len; | ||
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if (index >= EROFS_N_XATTR_PREFIXES) { | ||
errno = EINVAL; | ||
return NULL; | ||
} | ||
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prefix = erofs_xattr_prefixes[index]; | ||
prefix_len = strlen(prefix); | ||
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res = malloc(prefix_len + name_len + 1); | ||
if (res == NULL) { | ||
errno = ENOMEM; | ||
return NULL; | ||
} | ||
memcpy(res, prefix, prefix_len); | ||
memcpy(res + prefix_len, name, name_len); | ||
res[prefix_len + name_len] = 0; | ||
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return res; | ||
} | ||
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#endif |
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