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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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146bca72c7
We update information in logical volume integrity descriptor after each allocation (as LVID contains free space, number of directories and files on disk etc.). If the filesystem is on some phase change media, this leads to its quick degradation as such media is able to handle only 10000 overwrites or so. We solve the problem by writing new information into LVID only on umount, remount-ro and sync. This solves the problem at the price of longer media inconsistency (previously media became consistent after pdflush flushed dirty LVID buffer) but that should be acceptable. Report by and patch written in cooperation with Rich Coe <Richard.Coe@med.ge.com>. Signed-off-by: Jan Kara <jack@suse.cz>
169 lines
4.0 KiB
C
169 lines
4.0 KiB
C
#ifndef __LINUX_UDF_SB_H
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#define __LINUX_UDF_SB_H
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#include <linux/mutex.h>
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/* Since UDF 2.01 is ISO 13346 based... */
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#define UDF_SUPER_MAGIC 0x15013346
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#define UDF_MAX_READ_VERSION 0x0250
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#define UDF_MAX_WRITE_VERSION 0x0201
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#define UDF_FLAG_USE_EXTENDED_FE 0
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#define UDF_VERS_USE_EXTENDED_FE 0x0200
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#define UDF_FLAG_USE_STREAMS 1
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#define UDF_VERS_USE_STREAMS 0x0200
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#define UDF_FLAG_USE_SHORT_AD 2
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#define UDF_FLAG_USE_AD_IN_ICB 3
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#define UDF_FLAG_USE_FILE_CTIME_EA 4
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#define UDF_FLAG_STRICT 5
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#define UDF_FLAG_UNDELETE 6
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#define UDF_FLAG_UNHIDE 7
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#define UDF_FLAG_VARCONV 8
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#define UDF_FLAG_NLS_MAP 9
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#define UDF_FLAG_UTF8 10
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#define UDF_FLAG_UID_FORGET 11 /* save -1 for uid to disk */
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#define UDF_FLAG_UID_IGNORE 12 /* use sb uid instead of on disk uid */
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#define UDF_FLAG_GID_FORGET 13
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#define UDF_FLAG_GID_IGNORE 14
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#define UDF_FLAG_UID_SET 15
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#define UDF_FLAG_GID_SET 16
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#define UDF_FLAG_SESSION_SET 17
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#define UDF_FLAG_LASTBLOCK_SET 18
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#define UDF_FLAG_BLOCKSIZE_SET 19
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#define UDF_PART_FLAG_UNALLOC_BITMAP 0x0001
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#define UDF_PART_FLAG_UNALLOC_TABLE 0x0002
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#define UDF_PART_FLAG_FREED_BITMAP 0x0004
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#define UDF_PART_FLAG_FREED_TABLE 0x0008
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#define UDF_PART_FLAG_READ_ONLY 0x0010
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#define UDF_PART_FLAG_WRITE_ONCE 0x0020
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#define UDF_PART_FLAG_REWRITABLE 0x0040
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#define UDF_PART_FLAG_OVERWRITABLE 0x0080
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#define UDF_MAX_BLOCK_LOADED 8
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#define UDF_TYPE1_MAP15 0x1511U
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#define UDF_VIRTUAL_MAP15 0x1512U
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#define UDF_VIRTUAL_MAP20 0x2012U
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#define UDF_SPARABLE_MAP15 0x1522U
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#define UDF_METADATA_MAP25 0x2511U
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#define UDF_INVALID_MODE ((mode_t)-1)
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#pragma pack(1) /* XXX(hch): Why? This file just defines in-core structures */
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struct udf_meta_data {
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__u32 s_meta_file_loc;
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__u32 s_mirror_file_loc;
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__u32 s_bitmap_file_loc;
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__u32 s_alloc_unit_size;
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__u16 s_align_unit_size;
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__u8 s_dup_md_flag;
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struct inode *s_metadata_fe;
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struct inode *s_mirror_fe;
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struct inode *s_bitmap_fe;
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};
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struct udf_sparing_data {
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__u16 s_packet_len;
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struct buffer_head *s_spar_map[4];
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};
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struct udf_virtual_data {
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__u32 s_num_entries;
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__u16 s_start_offset;
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};
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struct udf_bitmap {
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__u32 s_extLength;
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__u32 s_extPosition;
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__u16 s_nr_groups;
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struct buffer_head **s_block_bitmap;
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};
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struct udf_part_map {
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union {
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struct udf_bitmap *s_bitmap;
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struct inode *s_table;
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} s_uspace;
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union {
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struct udf_bitmap *s_bitmap;
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struct inode *s_table;
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} s_fspace;
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__u32 s_partition_root;
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__u32 s_partition_len;
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__u16 s_partition_type;
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__u16 s_partition_num;
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union {
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struct udf_sparing_data s_sparing;
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struct udf_virtual_data s_virtual;
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struct udf_meta_data s_metadata;
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} s_type_specific;
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__u32 (*s_partition_func)(struct super_block *, __u32, __u16, __u32);
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__u16 s_volumeseqnum;
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__u16 s_partition_flags;
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};
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#pragma pack()
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struct udf_sb_info {
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struct udf_part_map *s_partmaps;
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__u8 s_volume_ident[32];
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/* Overall info */
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__u16 s_partitions;
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__u16 s_partition;
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/* Sector headers */
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__s32 s_session;
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__u32 s_anchor;
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__u32 s_last_block;
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struct buffer_head *s_lvid_bh;
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/* Default permissions */
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mode_t s_umask;
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gid_t s_gid;
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uid_t s_uid;
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mode_t s_fmode;
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mode_t s_dmode;
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/* Root Info */
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struct timespec s_record_time;
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/* Fileset Info */
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__u16 s_serial_number;
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/* highest UDF revision we have recorded to this media */
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__u16 s_udfrev;
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/* Miscellaneous flags */
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__u32 s_flags;
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/* Encoding info */
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struct nls_table *s_nls_map;
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/* VAT inode */
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struct inode *s_vat_inode;
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struct mutex s_alloc_mutex;
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/* Protected by s_alloc_mutex */
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unsigned int s_lvid_dirty;
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};
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static inline struct udf_sb_info *UDF_SB(struct super_block *sb)
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{
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return sb->s_fs_info;
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}
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struct logicalVolIntegrityDescImpUse *udf_sb_lvidiu(struct udf_sb_info *sbi);
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int udf_compute_nr_groups(struct super_block *sb, u32 partition);
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#define UDF_QUERY_FLAG(X,Y) ( UDF_SB(X)->s_flags & ( 1 << (Y) ) )
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#define UDF_SET_FLAG(X,Y) ( UDF_SB(X)->s_flags |= ( 1 << (Y) ) )
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#define UDF_CLEAR_FLAG(X,Y) ( UDF_SB(X)->s_flags &= ~( 1 << (Y) ) )
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#endif /* __LINUX_UDF_SB_H */
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