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authorAmit Arora <aarora@in.ibm.com>2007-07-17 21:42:41 -0400
committerTheodore Ts'o <tytso@mit.edu>2007-07-17 21:42:41 -0400
commita2df2a63407803a833f82e1fa6693826c8c9d584 (patch)
treedb761e8d82dbbe53e166511a9f8af9162541a212 /include
parent97ac73506c0ba93f30239bb57b4cfc5d73e68a62 (diff)
fallocate support in ext4
This patch implements ->fallocate() inode operation in ext4. With this patch users of ext4 file systems will be able to use fallocate() system call for persistent preallocation. Current implementation only supports preallocation for regular files (directories not supported as of date) with extent maps. This patch does not support block-mapped files currently. Only FALLOC_ALLOCATE and FALLOC_RESV_SPACE modes are being supported as of now. Signed-off-by: Amit Arora <aarora@in.ibm.com>
Diffstat (limited to 'include')
-rw-r--r--include/linux/ext4_fs.h8
-rw-r--r--include/linux/ext4_fs_extents.h15
2 files changed, 23 insertions, 0 deletions
diff --git a/include/linux/ext4_fs.h b/include/linux/ext4_fs.h
index de1f9f78625a..87c2d7a05b01 100644
--- a/include/linux/ext4_fs.h
+++ b/include/linux/ext4_fs.h
@@ -102,6 +102,7 @@
102 EXT4_GOOD_OLD_FIRST_INO : \ 102 EXT4_GOOD_OLD_FIRST_INO : \
103 (s)->s_first_ino) 103 (s)->s_first_ino)
104#endif 104#endif
105#define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
105 106
106/* 107/*
107 * Macro-instructions used to manage fragments 108 * Macro-instructions used to manage fragments
@@ -225,6 +226,11 @@ struct ext4_new_group_data {
225 __u32 free_blocks_count; 226 __u32 free_blocks_count;
226}; 227};
227 228
229/*
230 * Following is used by preallocation code to tell get_blocks() that we
231 * want uninitialzed extents.
232 */
233#define EXT4_CREATE_UNINITIALIZED_EXT 2
228 234
229/* 235/*
230 * ioctl commands 236 * ioctl commands
@@ -983,6 +989,8 @@ extern int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
983extern void ext4_ext_truncate(struct inode *, struct page *); 989extern void ext4_ext_truncate(struct inode *, struct page *);
984extern void ext4_ext_init(struct super_block *); 990extern void ext4_ext_init(struct super_block *);
985extern void ext4_ext_release(struct super_block *); 991extern void ext4_ext_release(struct super_block *);
992extern long ext4_fallocate(struct inode *inode, int mode, loff_t offset,
993 loff_t len);
986static inline int 994static inline int
987ext4_get_blocks_wrap(handle_t *handle, struct inode *inode, sector_t block, 995ext4_get_blocks_wrap(handle_t *handle, struct inode *inode, sector_t block,
988 unsigned long max_blocks, struct buffer_head *bh, 996 unsigned long max_blocks, struct buffer_head *bh,
diff --git a/include/linux/ext4_fs_extents.h b/include/linux/ext4_fs_extents.h
index acfe59740b03..e3d5afc6f23e 100644
--- a/include/linux/ext4_fs_extents.h
+++ b/include/linux/ext4_fs_extents.h
@@ -188,6 +188,21 @@ ext4_ext_invalidate_cache(struct inode *inode)
188 EXT4_I(inode)->i_cached_extent.ec_type = EXT4_EXT_CACHE_NO; 188 EXT4_I(inode)->i_cached_extent.ec_type = EXT4_EXT_CACHE_NO;
189} 189}
190 190
191static inline void ext4_ext_mark_uninitialized(struct ext4_extent *ext)
192{
193 ext->ee_len |= cpu_to_le16(0x8000);
194}
195
196static inline int ext4_ext_is_uninitialized(struct ext4_extent *ext)
197{
198 return (int)(le16_to_cpu((ext)->ee_len) & 0x8000);
199}
200
201static inline int ext4_ext_get_actual_len(struct ext4_extent *ext)
202{
203 return (int)(le16_to_cpu((ext)->ee_len) & 0x7FFF);
204}
205
191extern int ext4_extent_tree_init(handle_t *, struct inode *); 206extern int ext4_extent_tree_init(handle_t *, struct inode *);
192extern int ext4_ext_calc_credits_for_insert(struct inode *, struct ext4_ext_path *); 207extern int ext4_ext_calc_credits_for_insert(struct inode *, struct ext4_ext_path *);
193extern unsigned int ext4_ext_check_overlap(struct inode *, struct ext4_extent *, struct ext4_ext_path *); 208extern unsigned int ext4_ext_check_overlap(struct inode *, struct ext4_extent *, struct ext4_ext_path *);