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Commit c07651b556323e0e763c452587fe29d2b034b314

Authored by Aneesh Kumar K.V
Committed by Theodore Ts'o
1 parent dd919b9822
Exists in master and in 7 other branches imx_3.0.35_4.1.0, imx_3.10.17_1.0.1_ga, imx_3.10.53_1.1.0_ga, imx_3.14.28_1.0.0_ga, smarc-imx_3.10.53_1.1.0_ga, smarc-imx_3.14.28_1.0.0_ga, smarc-l5.0.0_1.0.0-ga

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>

Showing 1 changed file with 15 additions and 0 deletions Side-by-side Diff

... ... @@ -1004,6 +1004,7 @@
1004 1004 int qtype, qfmt;
1005 1005 char *qname;
1006 1006 #endif
  1007 + ext4_fsblk_t last_block;
1007 1008  
1008 1009 if (!options)
1009 1010 return 1;
... ... @@ -1326,6 +1327,20 @@
1326 1327 set_opt (sbi->s_mount_opt, EXTENTS);
1327 1328 break;
1328 1329 case Opt_noextents:
  1330 + /*
  1331 + * When e2fsprogs support resizing an already existing
  1332 + * ext3 file system to greater than 2**32 we need to
  1333 + * add support to block allocator to handle growing
  1334 + * already existing block mapped inode so that blocks
  1335 + * allocated for them fall within 2**32
  1336 + */
  1337 + last_block = ext4_blocks_count(sbi->s_es) - 1;
  1338 + if (last_block > 0xffffffffULL) {
  1339 + printk(KERN_ERR "EXT4-fs: Filesystem too "
  1340 + "large to mount with "
  1341 + "-o noextents options\n");
  1342 + return 0;
  1343 + }
1329 1344 clear_opt (sbi->s_mount_opt, EXTENTS);
1330 1345 break;
1331 1346 case Opt_i_version: