| 1 | /* |
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| 2 | * ramfs.h RAMFS file system API definition. |
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| 3 | * |
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| 4 | * Authors Mohamed Lamine Karaoui (2015) |
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| 5 | * Alain Greiner (2016) |
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| 6 | * |
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| 7 | * Copyright (c) UPMC Sorbonne Universites |
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| 8 | * |
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| 9 | * This file is part of ALMOS-MKH. |
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| 10 | * |
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| 11 | * ALMOS-MKH is free software; you can redistribute it and/or modify it |
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| 12 | * under the terms of the GNU General Public License as published by |
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| 13 | * the Free Software Foundation; version 2.0 of the License. |
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| 14 | * |
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| 15 | * ALMOS-MKH is distributed in the hope that it will be useful, but |
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| 16 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 18 | * General Public License for more details. |
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| 19 | * |
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| 20 | * You should have received a copy of the GNU General Public License |
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| 21 | * along with ALMOS-MKH; if not, write to the Free Software Foundation, |
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| 22 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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| 23 | */ |
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| 24 | |
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| 25 | #ifndef _RAMFS_H_ |
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| 26 | #define _RAMFS_H_ |
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| 27 | |
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| 28 | /**** Forward declarations ****/ |
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| 29 | |
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| 30 | struct vfs_inode_s; |
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| 31 | struct page_s; |
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| 32 | |
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| 33 | /***************************************************************************************** |
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| 34 | * This structure defines a RAMFS specific context extension. |
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| 35 | ****************************************************************************************/ |
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| 36 | |
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| 37 | typedef struct ramfs_ctx_s |
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| 38 | { |
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| 39 | intptr_t base; |
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| 40 | rwlock_t size; |
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| 41 | } |
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| 42 | ramfs_ctx_t; |
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| 43 | |
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| 44 | /***************************************************************************************** |
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| 45 | * This structure defines the RAMFS inode specific extension (versus the VFS inode). |
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| 46 | ****************************************************************************************/ |
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| 47 | |
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| 48 | typedef struct ramfs_inode_s |
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| 49 | { |
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| 50 | struct vfs_inode_s * vfs_inode; /*! local pointer on VFS inode */ |
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| 51 | } |
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| 52 | ramfs_inode_t; |
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| 53 | |
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| 54 | |
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| 55 | |
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| 56 | |
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| 57 | /***************************************************************************************** |
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| 58 | * This function allocates memory for a RAMFS inode, and link it to the VFS inode. |
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| 59 | ***************************************************************************************** |
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| 60 | * @ inode : local pointer on vfs_inode. |
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| 61 | * @ return 0 if success / return ENOMEM if error. |
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| 62 | ****************************************************************************************/ |
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| 63 | error_t ramfs_inode_create( struct vfs_inode_s * inode ); |
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| 64 | |
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| 65 | /***************************************************************************************** |
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| 66 | * This function releases memory allocated for a RAMFS inode. |
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| 67 | ***************************************************************************************** |
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| 68 | * @ inode : local pointer on vfs_inode. |
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| 69 | ****************************************************************************************/ |
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| 70 | void ramfs_inode_destroy( struct vfs_inode_s * inode ); |
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| 71 | |
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| 72 | /***************************************************************************************** |
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| 73 | * This function moves a page from the mapper to the RAMFS file system. |
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| 74 | * It must be called by a thread running in cluster containing the mapper. |
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| 75 | * The pointer on the mapper and the page index in file are supposed to be registered |
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| 76 | * in the page descriptor. |
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| 77 | ****************************************************************************************** |
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| 78 | * @ page : local pointer on source page descriptor. |
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| 79 | * @ return 0 if success / return EIO if error. |
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| 80 | ****************************************************************************************/ |
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| 81 | error_t ramfs_write_page( struct page_s * page ); |
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| 82 | |
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| 83 | /***************************************************************************************** |
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| 84 | * This function moves a page from the RAMFS file system to the mapper. |
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| 85 | * It must be called by a thread running in cluster containing the mapper. |
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| 86 | * The pointer on the mapper and the page index in file are supposed to be registered |
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| 87 | * in the page descriptor. |
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| 88 | ***************************************************************************************** |
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| 89 | * @ page : local pointer on destination page descriptor. |
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| 90 | * @ return 0 if success / return EIO if error. |
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| 91 | ****************************************************************************************/ |
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| 92 | error_t ramfs_read_page( struct page_s * page ); |
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| 93 | |
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| 94 | |
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| 95 | |
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| 96 | #endif /* _RAMFS_H_ */ |
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