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Date: Fri, 17 Oct 2008 09:27:27 -0400
From: Theodore Ts'o <tytso@....edu>
To: Ext4 Developers List <linux-ext4@...r.kernel.org>
Cc: Theodore Ts'o <tytso@....edu>
Subject: [PATCH] ext4: Remove automatic enabling of the HUGE_FILE feature flag
If the HUGE_FILE feature flag is not set, don't allow the creation of
large files, instead of automatically enabling the feature flag.
Recent versions of mke2fs will set the HUGE_FILE flag automatically
anyway for ext4 filesystems.
Signed-off-by: "Theodore Ts'o" <tytso@....edu>
---
fs/ext4/inode.c | 24 ++++-----------
fs/ext4/super.c | 85 +++++++++----------------------------------------------
2 files changed, 21 insertions(+), 88 deletions(-)
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 27fc6b9..8dbf695 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -4194,7 +4194,6 @@ static int ext4_inode_blocks_set(handle_t *handle,
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) {
/*
@@ -4204,36 +4203,27 @@ static int ext4_inode_blocks_set(handle_t *handle,
raw_inode->i_blocks_lo = cpu_to_le32(i_blocks);
raw_inode->i_blocks_high = 0;
ei->i_flags &= ~EXT4_HUGE_FILE_FL;
- } else if (i_blocks <= 0xffffffffffffULL) {
+ return 0;
+ }
+ if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE))
+ return -EFBIG;
+
+ 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(i_blocks);
raw_inode->i_blocks_high = cpu_to_le16(i_blocks >> 32);
ei->i_flags &= ~EXT4_HUGE_FILE_FL;
} else {
- /*
- * i_blocks should be represented in a 48 bit variable
- * as multiple of file system block size
- */
- err = ext4_update_rocompat_feature(handle, sb,
- EXT4_FEATURE_RO_COMPAT_HUGE_FILE);
- if (err)
- goto err_out;
ei->i_flags |= EXT4_HUGE_FILE_FL;
/* i_block is stored in file system block size */
i_blocks = i_blocks >> (inode->i_blkbits - 9);
raw_inode->i_blocks_lo = cpu_to_le32(i_blocks);
raw_inode->i_blocks_high = cpu_to_le16(i_blocks >> 32);
}
-err_out:
- return err;
+ return 0;
}
/*
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 95127f0..9b2b2bc 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -374,66 +374,6 @@ void ext4_update_dynamic_rev(struct super_block *sb)
*/
}
-int ext4_update_compat_feature(handle_t *handle,
- struct super_block *sb, __u32 compat)
-{
- int err = 0;
- if (!EXT4_HAS_COMPAT_FEATURE(sb, compat)) {
- err = ext4_journal_get_write_access(handle,
- EXT4_SB(sb)->s_sbh);
- if (err)
- return err;
- EXT4_SET_COMPAT_FEATURE(sb, compat);
- sb->s_dirt = 1;
- handle->h_sync = 1;
- BUFFER_TRACE(EXT4_SB(sb)->s_sbh,
- "call ext4_journal_dirty_met adata");
- err = ext4_journal_dirty_metadata(handle,
- EXT4_SB(sb)->s_sbh);
- }
- return err;
-}
-
-int ext4_update_rocompat_feature(handle_t *handle,
- struct super_block *sb, __u32 rocompat)
-{
- int err = 0;
- if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, rocompat)) {
- err = ext4_journal_get_write_access(handle,
- EXT4_SB(sb)->s_sbh);
- if (err)
- return err;
- EXT4_SET_RO_COMPAT_FEATURE(sb, rocompat);
- sb->s_dirt = 1;
- handle->h_sync = 1;
- BUFFER_TRACE(EXT4_SB(sb)->s_sbh,
- "call ext4_journal_dirty_met adata");
- err = ext4_journal_dirty_metadata(handle,
- EXT4_SB(sb)->s_sbh);
- }
- return err;
-}
-
-int ext4_update_incompat_feature(handle_t *handle,
- struct super_block *sb, __u32 incompat)
-{
- int err = 0;
- if (!EXT4_HAS_INCOMPAT_FEATURE(sb, incompat)) {
- err = ext4_journal_get_write_access(handle,
- EXT4_SB(sb)->s_sbh);
- if (err)
- return err;
- EXT4_SET_INCOMPAT_FEATURE(sb, incompat);
- sb->s_dirt = 1;
- handle->h_sync = 1;
- BUFFER_TRACE(EXT4_SB(sb)->s_sbh,
- "call ext4_journal_dirty_met adata");
- err = ext4_journal_dirty_metadata(handle,
- EXT4_SB(sb)->s_sbh);
- }
- return err;
-}
-
/*
* Open the external journal device
*/
@@ -1771,13 +1711,13 @@ static void ext4_orphan_cleanup(struct super_block *sb,
*
* Note, this does *not* consider any metadata overhead for vfs i_blocks.
*/
-static loff_t ext4_max_size(int blkbits)
+static loff_t ext4_max_size(int blkbits, int has_huge_files)
{
loff_t res;
loff_t upper_limit = MAX_LFS_FILESIZE;
/* small i_blocks in vfs inode? */
- if (sizeof(blkcnt_t) < sizeof(u64)) {
+ if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
/*
* CONFIG_LSF is not enabled implies the inode
* i_block represent total blocks in 512 bytes
@@ -1807,7 +1747,7 @@ static loff_t ext4_max_size(int blkbits)
* block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
* We need to be 1 filesystem block less than the 2^48 sector limit.
*/
-static loff_t ext4_max_bitmap_size(int bits)
+static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
{
loff_t res = EXT4_NDIR_BLOCKS;
int meta_blocks;
@@ -1820,11 +1760,11 @@ static loff_t ext4_max_bitmap_size(int bits)
* total number of 512 bytes blocks of the file
*/
- if (sizeof(blkcnt_t) < sizeof(u64)) {
+ if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
/*
- * CONFIG_LSF is not enabled implies the inode
- * i_block represent total blocks in 512 bytes
- * 32 == size of vfs inode i_blocks * 8
+ * !has_huge_files or CONFIG_LSF is not enabled
+ * implies the inode i_block represent total blocks in
+ * 512 bytes 32 == size of vfs inode i_blocks * 8
*/
upper_limit = (1LL << 32) - 1;
@@ -1933,7 +1873,7 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
int blocksize;
int db_count;
int i;
- int needs_recovery;
+ int needs_recovery, has_huge_files;
__le32 features;
__u64 blocks_count;
int err;
@@ -2074,7 +2014,9 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
sb->s_id, le32_to_cpu(features));
goto failed_mount;
}
- if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
+ has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb,
+ EXT4_FEATURE_RO_COMPAT_HUGE_FILE);
+ if (has_huge_files) {
/*
* Large file size enabled file system can only be
* mount if kernel is build with CONFIG_LSF
@@ -2124,8 +2066,9 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
}
}
- sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits);
- sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits);
+ sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
+ has_huge_files);
+ sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
--
1.5.6.1.205.ge2c7.dirty
--
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