ext4: do not set extents feature from the kernel
We've talked for a while about getting rid of any feature- setting from the kernel; this gets rid of the code which would set the INCOMPAT_EXTENTS flag on the first file write when mounted as ext4[dev]. With this patch, if the extents feature is not already set on disk, then mounting as ext4 will fall back to noextents with a warning, and if -o extents is explicitly requested, the mount will fail, also with warning. Signed-off-by: Eric Sandeen <sandeen@redhat.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
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@ -836,14 +836,10 @@ got:
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goto fail_free_drop;
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if (test_opt(sb, EXTENTS)) {
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/* set extent flag only for diretory, file and normal symlink*/
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/* set extent flag only for directory, file and normal symlink*/
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if (S_ISDIR(mode) || S_ISREG(mode) || S_ISLNK(mode)) {
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EXT4_I(inode)->i_flags |= EXT4_EXTENTS_FL;
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ext4_ext_tree_init(handle, inode);
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err = ext4_update_incompat_feature(handle, sb,
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EXT4_FEATURE_INCOMPAT_EXTENTS);
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if (err)
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goto fail_free_drop;
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}
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}
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@ -1324,6 +1324,13 @@ set_qf_format:
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clear_opt(sbi->s_mount_opt, NOBH);
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break;
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case Opt_extents:
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if (!EXT4_HAS_INCOMPAT_FEATURE(sb,
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EXT4_FEATURE_INCOMPAT_EXTENTS)) {
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ext4_warning(sb, __func__,
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"extents feature not enabled "
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"on this filesystem, use tune2fs\n");
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return 0;
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}
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set_opt (sbi->s_mount_opt, EXTENTS);
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break;
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case Opt_noextents:
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@ -1997,12 +2004,18 @@ static int ext4_fill_super (struct super_block *sb, void *data, int silent)
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/*
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* turn on extents feature by default in ext4 filesystem
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* User -o noextents to turn it off
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* only if feature flag already set by mkfs or tune2fs.
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* Use -o noextents to turn it off
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*/
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set_opt(sbi->s_mount_opt, EXTENTS);
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if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS))
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set_opt(sbi->s_mount_opt, EXTENTS);
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else
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ext4_warning(sb, __func__,
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"extents feature not enabled on this filesystem, "
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"use tune2fs.\n");
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/*
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* turn on mballoc feature by default in ext4 filesystem
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* User -o nomballoc to turn it off
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* turn on mballoc code by default in ext4 filesystem
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* Use -o nomballoc to turn it off
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*/
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set_opt(sbi->s_mount_opt, MBALLOC);
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