Minor changes to English comments - grammatical, etc.
git-svn-id: svn://kolibrios.org@2257 a494cfbc-eb01-0410-851d-a64ba20cac60
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@ -21,10 +21,10 @@ DISK_NO_INSERT_NOTIFICATION = 1
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; Media flags. Represent bits in DISKMEDIAINFO.Flags.
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; Media flags. Represent bits in DISKMEDIAINFO.Flags.
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DISK_MEDIA_READONLY = 1
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DISK_MEDIA_READONLY = 1
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; If we see too many partitions, probably there is some error on the disk.
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; If too many partitions are detected,there is probably an error on the disk.
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; 256 partitions should be enough for any reasonable use.
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; 256 partitions should be enough for any reasonable use.
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; Also, the same number is limiting the number of MBRs to process; if we see
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; Also, the same number is limiting the number of MBRs to process; if
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; too many MBRs, probably there is a loop in the MBR structure.
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; too many MBRs are visible,there probably is a loop in the MBR structure.
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MAX_NUM_PARTITIONS = 256
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MAX_NUM_PARTITIONS = 256
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; =============================================================================
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; =============================================================================
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@ -85,9 +85,9 @@ struct DISKFUNC
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; Return value: 0 = disable cache, otherwise = used cache size in bytes.
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; Return value: 0 = disable cache, otherwise = used cache size in bytes.
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ends
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ends
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; This structure holds an information about a media.
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; This structure holds information on a medium.
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; Objects with this structure are allocated by the kernel as a part of DISK
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; Objects with this structure are allocated by the kernel as a part of the DISK
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; structure and filled by a driver in the 'querymedia' callback.
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; structure and are filled by a driver in the 'querymedia' callback.
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struct DISKMEDIAINFO
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struct DISKMEDIAINFO
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.Flags dd ?
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.Flags dd ?
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; Combination of DISK_MEDIA_* bits.
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; Combination of DISK_MEDIA_* bits.
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@ -97,8 +97,8 @@ struct DISKMEDIAINFO
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; Size of the media in sectors.
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; Size of the media in sectors.
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ends
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ends
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; This structure represents disk cache. To follow the old implementation,
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; This structure represents the disk cache. To follow the old implementation,
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; there are two distinct caches for a disk, one for "system" data, other
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; there are two distinct caches for a disk, one for "system" data,and the other
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; for "application" data.
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; for "application" data.
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struct DISKCACHE
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struct DISKCACHE
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.Lock MUTEX
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.Lock MUTEX
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@ -160,9 +160,9 @@ struct DISK
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; Another reference is taken during any filesystem operation for this media.
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; Another reference is taken during any filesystem operation for this media.
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; The callback 'closemedia' is called when the reference count decrements to
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; The callback 'closemedia' is called when the reference count decrements to
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; zero: this usually occurs in 'disk_media_changed', but can be delayed to the
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; zero: this usually occurs in 'disk_media_changed', but can be delayed to the
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; end of last filesystem operation, if one is active.
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; end of the last filesystem operation, if one is active.
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.MediaInfo DISKMEDIAINFO
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.MediaInfo DISKMEDIAINFO
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; This field keeps an information about the current media.
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; This field keeps information on the current media.
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.NumPartitions dd ?
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.NumPartitions dd ?
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; Number of partitions on this media.
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; Number of partitions on this media.
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.Partitions dd ?
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.Partitions dd ?
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@ -227,9 +227,9 @@ endg
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uglobal
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uglobal
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; This mutex guards all operations with the global list of DISK structures.
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; This mutex guards all operations with the global list of DISK structures.
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disk_list_mutex MUTEX
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disk_list_mutex MUTEX
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; * There are two dependent objects, a disk and a media. In the simplest case
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; * There are two dependent objects, a disk and a media. In the simplest case,
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; disk and media are both non-removable. However, in the general case both
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; disk and media are both non-removable. However, in the general case both
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; can be removed at any time, simultaneously or only media, this makes things
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; can be removed at any time, simultaneously or only media,and this makes things
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; complicated.
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; complicated.
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; * For efficiency, both disk and media objects are located in the one
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; * For efficiency, both disk and media objects are located in the one
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; structure named DISK. However, logically they are different.
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; structure named DISK. However, logically they are different.
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@ -341,7 +341,7 @@ disk_add:
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; 1b. Check the result. If allocation failed, return (go to 9) with eax = 0.
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; 1b. Check the result. If allocation failed, return (go to 9) with eax = 0.
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test eax, eax
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test eax, eax
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jz .nothing
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jz .nothing
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; 2. Copy disk name to the DISK structure.
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; 2. Copy the disk name to the DISK structure.
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; 2a. Get length of the name, including the terminating zero.
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; 2a. Get length of the name, including the terminating zero.
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mov ebx, [esp+8+8] ; ebx = pointer to name
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mov ebx, [esp+8+8] ; ebx = pointer to name
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push eax ; save allocated pointer to DISK
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push eax ; save allocated pointer to DISK
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@ -627,7 +627,7 @@ disk_default_adjust_cache_size:
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mov eax, [esp+4]
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mov eax, [esp+4]
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ret 4
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ret 4
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; This is an internal function called from 'disk_media_changed' when new media
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; This is an internal function called from 'disk_media_changed' when a new media
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; is detected. It creates the list of partitions for the media.
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; is detected. It creates the list of partitions for the media.
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; If media is not partitioned, then the list consists of one partition which
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; If media is not partitioned, then the list consists of one partition which
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; covers all the media.
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; covers all the media.
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@ -688,17 +688,17 @@ lock dec [partition_buffer_users] ; no, we must allocate
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; execute step 9 and possibly step 10.
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; execute step 9 and possibly step 10.
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test ebp, ebp
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test ebp, ebp
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jnz .mbr
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jnz .mbr
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; Partition table can be present or not present. In the first case, we just
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; The partition table can be present or not present. In the first case, we just
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; read the MBR. In the second case, we just read the bootsector for some
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; read the MBR. In the second case, we just read the bootsector for a
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; filesystem.
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; filesystem.
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; We use the following algorithm to distinguish between these cases.
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; The following algorithm is used to distinguish between these cases.
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; A. If at least one entry of the partition table is invalid, this is
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; A. If at least one entry of the partition table is invalid, this is
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; a bootsector. See the description of 'is_partition_table_entry' for
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; a bootsector. See the description of 'is_partition_table_entry' for
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; definition of validity.
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; definition of validity.
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; B. If all entries are empty (filesystem type field is zero) and the first
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; B. If all entries are empty (filesystem type field is zero) and the first
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; byte is jmp opcode (0EBh or 0E9h), this is a bootsector which happens to
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; byte is jmp opcode (0EBh or 0E9h), this is a bootsector which happens to
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; have zeros in the place of partition table.
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; have zeros in the place of partition table.
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; C. Otherwise, this is a MBR.
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; C. Otherwise, this is an MBR.
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; 9. Test for MBR vs bootsector.
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; 9. Test for MBR vs bootsector.
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; 9a. Check entries. If any is invalid, go to 10 (rule A).
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; 9a. Check entries. If any is invalid, go to 10 (rule A).
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call is_partition_table_entry
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call is_partition_table_entry
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@ -724,7 +724,7 @@ lock dec [partition_buffer_users] ; no, we must allocate
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cmp byte [ebx], 0E9h
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cmp byte [ebx], 0E9h
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jnz .mbr
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jnz .mbr
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.notmbr:
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.notmbr:
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; 10. This is not MBR. The media is not partitioned. Create one partition
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; 10. This is not an MBR. The media is not partitioned. Create one partition
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; which covers all the media and abort the loop.
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; which covers all the media and abort the loop.
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stdcall disk_add_partition, 0, 0, \
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stdcall disk_add_partition, 0, 0, \
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dword [esi+DISK.MediaInfo.Capacity], dword [esi+DISK.MediaInfo.Capacity+4]
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dword [esi+DISK.MediaInfo.Capacity], dword [esi+DISK.MediaInfo.Capacity+4]
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