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| author | Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> | 2008-07-11 19:27:31 -0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2008-07-11 19:27:31 -0400 |
| commit | c07651b556323e0e763c452587fe29d2b034b314 (patch) | |
| tree | 6cae1d3c9a63e1a5ba83639003af792591845347 /fs/ext4/super.c | |
| parent | dd919b9822c5fd9fd72f95a602440130297c3857 (diff) | |
| download | linux-c07651b556323e0e763c452587fe29d2b034b314.tar.gz linux-c07651b556323e0e763c452587fe29d2b034b314.tar.xz | |
ext4: Don't allow nonextenst mount option for large filesystem
The block mapped inode format can address only blocks within 2**32. This
causes a number of issues, the biggest of which is that the block
allocator needs to be taught that certain inodes can not utilize block
numbers > 2**32. So until this is fixed, it is simplest to fail
mounting of file systems with more than 2**32 blocks if the -o noextents
option is given.
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Mingming Cao <cmm@us.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'fs/ext4/super.c')
| -rw-r--r-- | fs/ext4/super.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/fs/ext4/super.c b/fs/ext4/super.c index 4e104dd0ec21..2bf9cdd7a036 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -1004,6 +1004,7 @@ static int parse_options (char *options, struct super_block *sb, int qtype, qfmt; char *qname; #endif + ext4_fsblk_t last_block; if (!options) return 1; @@ -1326,6 +1327,20 @@ set_qf_format: set_opt (sbi->s_mount_opt, EXTENTS); break; case Opt_noextents: + /* + * When e2fsprogs support resizing an already existing + * ext3 file system to greater than 2**32 we need to + * add support to block allocator to handle growing + * already existing block mapped inode so that blocks + * allocated for them fall within 2**32 + */ + last_block = ext4_blocks_count(sbi->s_es) - 1; + if (last_block > 0xffffffffULL) { + printk(KERN_ERR "EXT4-fs: Filesystem too " + "large to mount with " + "-o noextents options\n"); + return 0; + } clear_opt (sbi->s_mount_opt, EXTENTS); break; case Opt_i_version: |