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Subject[PATCH 2/3] ext3 reservation allow turn off for specifed file
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Allow user shut down reservation-based allocation(using ioctl) on a specific file(e.g. for seeky random write).


---
linux-2.6.9-rc4-mm1-ming/fs/ext3/balloc.c | 15 +++++++++++++--
1 files changed, 13 insertions(+), 2 deletions(-)
diff -puN fs/ext3/balloc.c~ext3_shutdown_reservation_per-file fs/ext3/balloc.c
--- linux-2.6.9-rc4-mm1/fs/ext3/balloc.c~ext3_shutdown_reservation_per-file 2004-10-18 22:27:06.333698488 -0700
+++ linux-2.6.9-rc4-mm1-ming/fs/ext3/balloc.c 2004-10-18 22:34:52.825780912 -0700
@@ -1153,6 +1153,7 @@ int ext3_new_block(handle_t *handle, str
struct ext3_super_block *es;
struct ext3_sb_info *sbi;
struct reserve_window_node *my_rsv = NULL;
+ struct reserve_window_node *rsv = &EXT3_I(inode)->i_rsv_window;
#ifdef EXT3FS_DEBUG
static int goal_hits, goal_attempts;
#endif
@@ -1176,8 +1177,18 @@ int ext3_new_block(handle_t *handle, str
sbi = EXT3_SB(sb);
es = EXT3_SB(sb)->s_es;
ext3_debug("goal=%lu.\n", goal);
- if (test_opt(sb, RESERVATION) && S_ISREG(inode->i_mode))
- my_rsv = &EXT3_I(inode)->i_rsv_window;
+ /*
+ * Allocate a block from reservation only when
+ * filesystem is mounted with reservation(default,-o reservation), and
+ * it's a regular file, and
+ * the desired window size is greater than 0 (One could use ioctl
+ * command EXT3_IOC_SETRSVSZ to set the window size to 0 to turn off
+ * reservation on that particular file)
+ */
+ if (test_opt(sb, RESERVATION) &&
+ S_ISREG(inode->i_mode) &&
+ (atomic_read(&rsv->rsv_goal_size) > 0))
+ my_rsv = rsv;
if (!ext3_has_free_blocks(sbi)) {
*errp = -ENOSPC;
goto out;
_

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