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| author | Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> | 2009-05-12 14:40:37 -0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2009-05-12 14:40:37 -0400 |
| commit | 33b9817e2ae097c7b8d256e3510ac6c54fc6d9d0 (patch) | |
| tree | 3de27ab9a089fb53503fdcc2746e396ee9fb78d0 /fs/ext4/inode.c | |
| parent | 9c1ee184a30394e54165fa4c15923cabd952c106 (diff) | |
| download | lwn-33b9817e2ae097c7b8d256e3510ac6c54fc6d9d0.tar.gz lwn-33b9817e2ae097c7b8d256e3510ac6c54fc6d9d0.zip | |
ext4: Use a fake block number for delayed new buffer_head
Use a very large unsigned number (~0xffff) as as the fake block number
for the delayed new buffer. The VFS should never try to write out this
number, but if it does, this will make it obvious.
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'fs/ext4/inode.c')
| -rw-r--r-- | fs/ext4/inode.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index d4b634ae06bd..0ac31a06422b 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -2297,6 +2297,10 @@ static int ext4_da_get_block_prep(struct inode *inode, sector_t iblock, struct buffer_head *bh_result, int create) { int ret = 0; + sector_t invalid_block = ~((sector_t) 0xffff); + + if (invalid_block < ext4_blocks_count(EXT4_SB(inode->i_sb)->s_es)) + invalid_block = ~0; BUG_ON(create == 0); BUG_ON(bh_result->b_size != inode->i_sb->s_blocksize); @@ -2318,7 +2322,7 @@ static int ext4_da_get_block_prep(struct inode *inode, sector_t iblock, /* not enough space to reserve */ return ret; - map_bh(bh_result, inode->i_sb, 0); + map_bh(bh_result, inode->i_sb, invalid_block); set_buffer_new(bh_result); set_buffer_delay(bh_result); } else if (ret > 0) { |