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author | Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> | 2008-01-29 04:58:26 (GMT) |
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committer | Theodore Ts'o <tytso@mit.edu> | 2008-01-29 04:58:26 (GMT) |
commit | 0fc1b451471dfc3cabd6e99ef441df9804616e63 (patch) | |
tree | b018b6ddc5bb5f02b985b06c11f0c01adb38167a /fs/ext4/inode.c | |
parent | a48380f769dfed6163fb82a68b13bd562ea1e027 (diff) | |
download | linux-fsl-qoriq-0fc1b451471dfc3cabd6e99ef441df9804616e63.tar.xz |
ext4: Add support for 48 bit inode i_blocks.
Use the __le16 l_i_reserved1 field of the linux2 struct of ext4_inode
to represet the higher 16 bits for i_blocks. With this change max_file
size becomes (2**48 -1 )* 512 bytes.
We add a RO_COMPAT feature to the super block to indicate that inode
have i_blocks represented as a split 48 bits. Super block with this
feature set cannot be mounted read write on a kernel with CONFIG_LSF
disabled.
Super block flag EXT4_FEATURE_RO_COMPAT_HUGE_FILE
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Diffstat (limited to 'fs/ext4/inode.c')
-rw-r--r-- | fs/ext4/inode.c | 58 |
1 files changed, 56 insertions, 2 deletions
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index e663455..bb89fe7 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -2667,6 +2667,22 @@ void ext4_get_inode_flags(struct ext4_inode_info *ei) if (flags & S_DIRSYNC) ei->i_flags |= EXT4_DIRSYNC_FL; } +static blkcnt_t ext4_inode_blocks(struct ext4_inode *raw_inode, + struct ext4_inode_info *ei) +{ + blkcnt_t i_blocks ; + struct super_block *sb = ei->vfs_inode.i_sb; + + if (EXT4_HAS_RO_COMPAT_FEATURE(sb, + EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) { + /* we are using combined 48 bit field */ + i_blocks = ((u64)le16_to_cpu(raw_inode->i_blocks_high)) << 32 | + le32_to_cpu(raw_inode->i_blocks_lo); + return i_blocks; + } else { + return le32_to_cpu(raw_inode->i_blocks_lo); + } +} void ext4_read_inode(struct inode * inode) { @@ -2715,8 +2731,8 @@ void ext4_read_inode(struct inode * inode) * recovery code: that's fine, we're about to complete * the process of deleting those. */ } - inode->i_blocks = le32_to_cpu(raw_inode->i_blocks); ei->i_flags = le32_to_cpu(raw_inode->i_flags); + inode->i_blocks = ext4_inode_blocks(raw_inode, ei); ei->i_file_acl = le32_to_cpu(raw_inode->i_file_acl_lo); if (EXT4_SB(inode->i_sb)->s_es->s_creator_os != cpu_to_le32(EXT4_OS_HURD)) { @@ -2799,6 +2815,43 @@ bad_inode: return; } +static int ext4_inode_blocks_set(handle_t *handle, + struct ext4_inode *raw_inode, + struct ext4_inode_info *ei) +{ + struct inode *inode = &(ei->vfs_inode); + u64 i_blocks = inode->i_blocks; + struct super_block *sb = inode->i_sb; + int err = 0; + + if (i_blocks <= ~0U) { + /* + * i_blocks can be represnted in a 32 bit variable + * as multiple of 512 bytes + */ + raw_inode->i_blocks_lo = cpu_to_le32((u32)i_blocks); + raw_inode->i_blocks_high = 0; + } else if (i_blocks <= 0xffffffffffffULL) { + /* + * i_blocks can be represented in a 48 bit variable + * as multiple of 512 bytes + */ + err = ext4_update_rocompat_feature(handle, sb, + EXT4_FEATURE_RO_COMPAT_HUGE_FILE); + if (err) + goto err_out; + /* i_block is stored in the split 48 bit fields */ + raw_inode->i_blocks_lo = cpu_to_le32((u32)i_blocks); + raw_inode->i_blocks_high = cpu_to_le16(i_blocks >> 32); + } else { + ext4_error(sb, __FUNCTION__, + "Wrong inode i_blocks count %llu\n", + (unsigned long long)inode->i_blocks); + } +err_out: + return err; +} + /* * Post the struct inode info into an on-disk inode location in the * buffer-cache. This gobbles the caller's reference to the @@ -2853,7 +2906,8 @@ static int ext4_do_update_inode(handle_t *handle, EXT4_INODE_SET_XTIME(i_atime, inode, raw_inode); EXT4_EINODE_SET_XTIME(i_crtime, ei, raw_inode); - raw_inode->i_blocks = cpu_to_le32(inode->i_blocks); + if (ext4_inode_blocks_set(handle, raw_inode, ei)) + goto out_brelse; raw_inode->i_dtime = cpu_to_le32(ei->i_dtime); raw_inode->i_flags = cpu_to_le32(ei->i_flags); if (EXT4_SB(inode->i_sb)->s_es->s_creator_os != |