ext4: Fallback to vmalloc if kmalloc can't allocate s_flex_groups array

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For very large filesystems, the s_flex_groups array can get quite big.
For example, a filesystem that can be resized up to 16TB will have
8192 flex groups (assuming the default flex_bg size of 16), so the
array is 96k, which is *very* marginal for kmalloc().  On the other
hand, a 160GB filesystem without the resize_inode feature will only
require 960 bytes.  So we try to allocate the array first using
kmalloc(), and if that fails, we'll try to use vmalloc() instead.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

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This commit is contained in:

Theodore Ts'o 2009-04-27 22:48:48 -04:00

parent 29fa89d088

commit c5ca7c7636

1 changed files with 19 additions and 3 deletions

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fs/ext4/super.c

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