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authorTheodore Ts'o <tytso@mit.edu>2009-05-01 13:44:33 -0400
committerTheodore Ts'o <tytso@mit.edu>2009-05-01 13:44:33 -0400
commitd444c3c38189b3f18337a213855ac1c07af4e2d9 (patch)
tree180b83e442c9ab72e1553a19140e3f1169806d28 /fs/ext4/ext4.h
parent75507efb1372b6acf1aa6bf00ebd49ce196fd994 (diff)
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ext4: Move the ext4_i.h header file into ext4.h
There is no longer a reason for a separate ext4_i.h header file, so move it into ext4.h just to make life easier for developers to find the relevant data structures and typedefs. Should also speed up compiles slightly, too. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'fs/ext4/ext4.h')
-rw-r--r--fs/ext4/ext4.h122
1 files changed, 121 insertions, 1 deletions
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 02ec44b..ba57d66 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -21,7 +21,10 @@
#include <linux/magic.h>
#include <linux/jbd2.h>
#include <linux/quota.h>
-#include "ext4_i.h"
+#include <linux/rwsem.h>
+#include <linux/rbtree.h>
+#include <linux/seqlock.h>
+#include <linux/mutex.h>
/*
* The fourth extended filesystem constants/structures
@@ -46,6 +49,19 @@
#define ext4_debug(f, a...) do {} while (0)
#endif
+/* data type for block offset of block group */
+typedef int ext4_grpblk_t;
+
+/* data type for filesystem-wide blocks number */
+typedef unsigned long long ext4_fsblk_t;
+
+/* data type for file logical block number */
+typedef __u32 ext4_lblk_t;
+
+/* data type for block group number */
+typedef unsigned int ext4_group_t;
+
+
/* prefer goal again. length */
#define EXT4_MB_HINT_MERGE 1
/* blocks already reserved */
@@ -516,6 +532,110 @@ do { \
#endif /* defined(__KERNEL__) || defined(__linux__) */
/*
+ * storage for cached extent
+ */
+struct ext4_ext_cache {
+ ext4_fsblk_t ec_start;
+ ext4_lblk_t ec_block;
+ __u32 ec_len; /* must be 32bit to return holes */
+ __u32 ec_type;
+};
+
+/*
+ * fourth extended file system inode data in memory
+ */
+struct ext4_inode_info {
+ __le32 i_data[15]; /* unconverted */
+ __u32 i_flags;
+ ext4_fsblk_t i_file_acl;
+ __u32 i_dtime;
+
+ /*
+ * i_block_group is the number of the block group which contains
+ * this file's inode. Constant across the lifetime of the inode,
+ * it is ued for making block allocation decisions - we try to
+ * place a file's data blocks near its inode block, and new inodes
+ * near to their parent directory's inode.
+ */
+ ext4_group_t i_block_group;
+ __u32 i_state; /* Dynamic state flags for ext4 */
+
+ ext4_lblk_t i_dir_start_lookup;
+#ifdef CONFIG_EXT4_FS_XATTR
+ /*
+ * Extended attributes can be read independently of the main file
+ * data. Taking i_mutex even when reading would cause contention
+ * between readers of EAs and writers of regular file data, so
+ * instead we synchronize on xattr_sem when reading or changing
+ * EAs.
+ */
+ struct rw_semaphore xattr_sem;
+#endif
+#ifdef CONFIG_EXT4_FS_POSIX_ACL
+ struct posix_acl *i_acl;
+ struct posix_acl *i_default_acl;
+#endif
+
+ struct list_head i_orphan; /* unlinked but open inodes */
+
+ /*
+ * i_disksize keeps track of what the inode size is ON DISK, not
+ * in memory. During truncate, i_size is set to the new size by
+ * the VFS prior to calling ext4_truncate(), but the filesystem won't
+ * set i_disksize to 0 until the truncate is actually under way.
+ *
+ * The intent is that i_disksize always represents the blocks which
+ * are used by this file. This allows recovery to restart truncate
+ * on orphans if we crash during truncate. We actually write i_disksize
+ * into the on-disk inode when writing inodes out, instead of i_size.
+ *
+ * The only time when i_disksize and i_size may be different is when
+ * a truncate is in progress. The only things which change i_disksize
+ * are ext4_get_block (growth) and ext4_truncate (shrinkth).
+ */
+ loff_t i_disksize;
+
+ /*
+ * i_data_sem is for serialising ext4_truncate() against
+ * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's
+ * data tree are chopped off during truncate. We can't do that in
+ * ext4 because whenever we perform intermediate commits during
+ * truncate, the inode and all the metadata blocks *must* be in a
+ * consistent state which allows truncation of the orphans to restart
+ * during recovery. Hence we must fix the get_block-vs-truncate race
+ * by other means, so we have i_data_sem.
+ */
+ struct rw_semaphore i_data_sem;
+ struct inode vfs_inode;
+ struct jbd2_inode jinode;
+
+ struct ext4_ext_cache i_cached_extent;
+ /*
+ * File creation time. Its function is same as that of
+ * struct timespec i_{a,c,m}time in the generic inode.
+ */
+ struct timespec i_crtime;
+
+ /* mballoc */
+ struct list_head i_prealloc_list;
+ spinlock_t i_prealloc_lock;
+
+ /* ialloc */
+ ext4_group_t i_last_alloc_group;
+
+ /* allocation reservation info for delalloc */
+ unsigned int i_reserved_data_blocks;
+ unsigned int i_reserved_meta_blocks;
+ unsigned int i_allocated_meta_blocks;
+ unsigned short i_delalloc_reserved_flag;
+
+ /* on-disk additional length */
+ __u16 i_extra_isize;
+
+ spinlock_t i_block_reservation_lock;
+};
+
+/*
* File system states
*/
#define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
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