reiserfs: shrink superblock if no xattrs
This makes in-core superblock fit into one cacheline here. Before: struct dentry * xattr_root; /* 124 4 */ /* --- cacheline 1 boundary (128 bytes) --- */ struct rw_semaphore xattr_dir_sem; /* 128 12 */ int j_errno; /* 140 4 */ }; /* size: 144, cachelines: 2 */ /* sum members: 142, holes: 1, sum holes: 2 */ /* last cacheline: 16 bytes */ After: int j_errno; /* 124 4 */ /* --- cacheline 1 boundary (128 bytes) --- */ }; /* size: 128, cachelines: 1 */ /* sum members: 126, holes: 1, sum holes: 2 */ Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Cc: <reiserfs-dev@namesys.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -433,12 +433,13 @@ int remove_save_link(struct inode *inode, int truncate)
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static void reiserfs_kill_sb(struct super_block *s)
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{
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if (REISERFS_SB(s)) {
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#ifdef CONFIG_REISERFS_FS_XATTR
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if (REISERFS_SB(s)->xattr_root) {
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d_invalidate(REISERFS_SB(s)->xattr_root);
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dput(REISERFS_SB(s)->xattr_root);
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REISERFS_SB(s)->xattr_root = NULL;
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}
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#endif
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if (REISERFS_SB(s)->priv_root) {
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d_invalidate(REISERFS_SB(s)->priv_root);
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dput(REISERFS_SB(s)->priv_root);
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@ -1562,9 +1563,10 @@ static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
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REISERFS_SB(s)->s_alloc_options.preallocmin = 0;
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/* Preallocate by 16 blocks (17-1) at once */
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REISERFS_SB(s)->s_alloc_options.preallocsize = 17;
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#ifdef CONFIG_REISERFS_FS_XATTR
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/* Initialize the rwsem for xattr dir */
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init_rwsem(&REISERFS_SB(s)->xattr_dir_sem);
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#endif
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/* setup default block allocator options */
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reiserfs_init_alloc_options(s);
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@ -401,9 +401,10 @@ struct reiserfs_sb_info {
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int reserved_blocks; /* amount of blocks reserved for further allocations */
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spinlock_t bitmap_lock; /* this lock on now only used to protect reserved_blocks variable */
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struct dentry *priv_root; /* root of /.reiserfs_priv */
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#ifdef CONFIG_REISERFS_FS_XATTR
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struct dentry *xattr_root; /* root of /.reiserfs_priv/.xa */
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struct rw_semaphore xattr_dir_sem;
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#endif
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int j_errno;
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#ifdef CONFIG_QUOTA
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char *s_qf_names[MAXQUOTAS];
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