ext4: drop i_state_flags on architectures with 64-bit longs
We can store the dynamic inode state flags in the high bits of EXT4_I(inode)->i_flags, and eliminate i_state_flags. This saves 8 bytes from the size of ext4_inode_info structure, which when multiplied by the number of the number of in the inode cache, can save a lot of memory. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
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8a2005d3f8
Коммит
353eb83c14
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@ -764,7 +764,9 @@ struct ext4_inode_info {
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*/
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ext4_group_t i_block_group;
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ext4_lblk_t i_dir_start_lookup;
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#if (BITS_PER_LONG < 64)
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unsigned long i_state_flags; /* Dynamic state flags */
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#endif
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unsigned long i_flags;
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#ifdef CONFIG_EXT4_FS_XATTR
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@ -1239,22 +1241,36 @@ enum {
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EXT4_STATE_DELALLOC_RESERVED, /* blks already reserved for delalloc */
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};
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#define EXT4_INODE_BIT_FNS(name, field) \
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#define EXT4_INODE_BIT_FNS(name, field, offset) \
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static inline int ext4_test_inode_##name(struct inode *inode, int bit) \
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{ \
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return test_bit(bit, &EXT4_I(inode)->i_##field); \
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return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
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} \
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static inline void ext4_set_inode_##name(struct inode *inode, int bit) \
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{ \
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set_bit(bit, &EXT4_I(inode)->i_##field); \
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set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
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} \
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static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
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{ \
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clear_bit(bit, &EXT4_I(inode)->i_##field); \
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clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
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}
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EXT4_INODE_BIT_FNS(flag, flags)
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EXT4_INODE_BIT_FNS(state, state_flags)
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EXT4_INODE_BIT_FNS(flag, flags, 0)
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#if (BITS_PER_LONG < 64)
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EXT4_INODE_BIT_FNS(state, state_flags, 0)
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static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
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{
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(ei)->i_state_flags = 0;
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}
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#else
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EXT4_INODE_BIT_FNS(state, flags, 32)
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static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
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{
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/* We depend on the fact that callers will set i_flags */
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}
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#endif
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#else
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/* Assume that user mode programs are passing in an ext4fs superblock, not
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* a kernel struct super_block. This will allow us to call the feature-test
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@ -1027,7 +1027,7 @@ got:
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inode->i_generation = sbi->s_next_generation++;
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spin_unlock(&sbi->s_next_gen_lock);
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ei->i_state_flags = 0;
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ext4_clear_state_flags(ei); /* Only relevant on 32-bit archs */
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ext4_set_inode_state(inode, EXT4_STATE_NEW);
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ei->i_extra_isize = EXT4_SB(sb)->s_want_extra_isize;
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@ -4868,7 +4868,7 @@ struct inode *ext4_iget(struct super_block *sb, unsigned long ino)
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}
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inode->i_nlink = le16_to_cpu(raw_inode->i_links_count);
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ei->i_state_flags = 0;
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ext4_clear_state_flags(ei); /* Only relevant on 32-bit archs */
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ei->i_dir_start_lookup = 0;
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ei->i_dtime = le32_to_cpu(raw_inode->i_dtime);
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/* We now have enough fields to check if the inode was active or not.
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@ -5127,7 +5127,7 @@ static int ext4_do_update_inode(handle_t *handle,
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if (ext4_inode_blocks_set(handle, raw_inode, ei))
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goto out_brelse;
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raw_inode->i_dtime = cpu_to_le32(ei->i_dtime);
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raw_inode->i_flags = cpu_to_le32(ei->i_flags);
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raw_inode->i_flags = cpu_to_le32(ei->i_flags & 0xFFFFFFFF);
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if (EXT4_SB(inode->i_sb)->s_es->s_creator_os !=
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cpu_to_le32(EXT4_OS_HURD))
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raw_inode->i_file_acl_high =
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